DESCRIPTION
POWER STORAGE SYSTEM
Technical Field
5 [OOOl] The present technology relates to a power
storage system that predicts a failure by using a
multivariate analysis.
Background Art
[0002] Recently, a technology has been put into
10 practical use, which detects abnormality before a
system or device (hereinafter, called monitoring
target) reaches its service stop by a failure during an
operation of the monitoring target by the pattern
recognition technology such as a Mahalanobis-Taguchi
system as one of multivariate analysis techniques, and
prompts an appropriate measure.
[00031 In this technology, after it is ensured that
the monitoring target exhibits a normal behavior, the
monitoring target is previously tested using various
use cases, and a database (hereinafter, called
reference database or reference data set) representing
a normal space is established from the aggregate of
multidimensional data (hereinafter, called operation
data set) acquired by various sensors of the monitoring
target. The normal space represented by the reference
database and a currently acquired operation data set
are analyzed by the pattern recognition technology
described above. On the basis of the magnitude of a
numerical value acquired as an analysis result, the
numerical value indicating incompatibility between a
5 reference value and the current monitoring target,
abnormality is then detected.
[0004] When a reference database is established,
every use case when the monitoring target is operated
is assumed, and information from a sensor that is
10 involved by the behavior of the monitoring target is
acquired as an operation data set, to establish the
reference database. In an actual operation of the
monitoring target, however, an exceptional behavior of
the monitoring target, which results from an event that
15 could not been assumed when every use case was assumed,
may occur due to an environment where the monitoring
target is located, characteristics of a load connected
to the monitoring target, and the like. When such an
exceptional behavior increases the numerical value
indicating incompatibility, there is a possibility
that, though this behavior falls within the range of
normality, this is erroneously detected to be abnormal.
[0005] In this regard, the technology of updating
the reference database during the operation of the
monitoring target has been developed. For example,
Patent Document 1 discloses a technology in which a
reference database is updated in an environment
monitoring system that detects environmental
abnormality by using the Mahalanobis-Taguchi system.
[0006] In this environment monitoring system, a
Mahalanobis distance is calculated from a data set
acquired in an actual monitoring, and whether the
calculated Mahalanobis distance in the monitoring is
close to a reference Mahalanobis distance or not is
determined. When it is determined to be close, the data
set providing the Mahalanobis distance in the
monitoring is newly added to an existing reference
database to update the reference database, and when the
reference Mahalanobis distance is updated,
environmental abnormality is detected using the updated
reference Mahalanobis distance.
[0007] In other words, when the numerical value
indicating incompatibility of the operation data set to
the reference database, the operation data set being
acquired when the operation is monitored, is equal to
or smaller than a certain reference, such a numerical
value is allowed, and the reference database is updated
so as to include the operation data set therein. In the
case where a similar event occurs again, this event is
not detected to be abnormal.
[00081 Patent Document 1: Japanese Patent
Application Laid-open No. Hei 10-124766
Summary of Invention
Problem to be solved by the Invention
100091 In the abnormality detection system, however,
the technique for updating the reference database in
5 the operation has various improvements, such as causing
a possibility in which a reference Mahalanobis distance
changes along with repeated updates of the reference
database by using various data sets in operations, and
sensitivity to detect abnormality is deteriorated.
10 [OOlO] In view of the circumstances as described
above, it is an object of the present technology to
provide a power storage system capable of appropriately
detecting abnormality.
Means for solving the Problem
[OOll] In order to achieve the above object,
according to an embodiment of the present technology,
there is provided a power storage system including: a
power storage unit including a storage battery, a
charging section that charges the storage battery, and
a detection section that detects at least one status of
the storage battery and the charging section from a
plurality of perspectives; and an abnormality detection
unit including an input section that acquires
transmission information from the power storage unit
via a transmission path, the transmission information
including a plurality of detected status values, and an
abnormality detection section that detects abnormality
of the power storage unit by a multivariate analysis
performed on the plurality of acquired status values.
[0012] In order to achieve the above object,
5 according to the embodiment of the present technology,
in the power storage system, the abnormality detection
unit may further include a first storage section that
stores a reference data set defining a normal state of
the power storage unit by the plurality of status
values, and the abnormality detection section of the
abnormality detection unit may be configured to
evaluate incompatibility between the plurality of
acquired status values and the stored reference data
set, and update the reference database on the basis of
an evaluation result.
[0013] In order to achieve the above object,
according to the embodiment of the present technology,
the power storage system may further include a repeater
unit including a first control section, the first
control section being provided on the transmission path
connecting the power storage unit and the abnormality
detection unit, receiving the transmission information
transmitted from the detection section, changing the
status value on the basis of the status value included
in the received transmission information, and
transmitting the transmission information including the
changed status value to the input section.
[OOl4] In order to achieve the above object,
according to the embodiment of the present technology,
in the power storage system, the first control section
5 of the repeater unit may be configured to add flag
information to the transmitted transmission
information, the flag information indicating that the
status value has been changed.
[0015] In order to achieve the above object,
10 according to the embodiment of the present technology,
in the power storage system, the abnormality detection
unit may further include a second storage section that
stores a backup of the reference data set, and the
power storage system may further include a sensitivity
test execution unit including a second control section,
the second control section causing the first control
section of the repeater unit to transmit the
transmission information changed for a test to the
input section, causing the abnormality detection
section of the abnormality detection unit to determine
whether the power storage unit is abnormal or not on
the basis of the received transmission information for
a test, and in any of a case where the status value by
which the power storage unit is determined to be
abnormal is set in the received transmission
information for a test, and the abnormality detection
unit determines that the power storage unit is normal,
and a case where the status value by which the power
storage unit is determined to be normal is set in the
received transmission information for a test, and the
5 abnormality detection unit determines that the power
storage unit is abnormal, causing the abnormality
detection section of the abnormality detection unit to
write the backup stored in the second storage section
back to the reference data set stored in the first
10 storage section.
[0016] In order to achieve the above object,
according to the embodiment of the present technology,
in the power storage system, the second control section
of the sensitivity test execution unit may be
configured to cause the abnormality detection section
of the abnormality detection unit to update the
reference data set stored in the first storage section,
the reference data set being written back by the
backup, on the basis of the transmission information
lastly received in an actual operation.
Effects of the Invention
[0017] As described above, according to the present
t it is possible to appropriately perform
abnormality detection. It should be noted that the
scribed herein are not necessarily limited
f the effects desc
produced.
Brief Description of Drawings
[00181 [Fig. 11 Fig. 1 is a block diagram showing a
general outline of the e n t i r e power storage system.
5 [Fig. 21 Fig. 2 is a block diagram of a power storage
system lOOb with a changed configuration.
[Fig. 31 Fig. 3 is a block diagram of a power storage
system lOOc with a changed configuration.
[Fig. 41 Fig. 4 is a block diagram of a case where
10 repeaters 40a, 40b, and 40c are each constituted by a
general PC.
[Fig. 51 Fig. 5 is a diagram showing a s t a t e where the
repeaters 40a, -40b, and 40c each correct the content of
a received packet, when a s e n s i t i v i t y test is
performed.
[Fig. 61 Fig. 6 is a functional block diagram of an
abnormality detection computation section 50.
[Fig. 71 Fig. 7 is a flowchart for describing a flow
from i n s t a l l a t i o n of a power storage system 100 t o a
normal operation.
[Fig. 81 Fig. 8 is a flowchart for describing a
processing flow when a reference database 52 is updated
a f t e r the power storage system 100 is normally
activated, or a s e n s i t i v i t y t e s t is performed a f t e r the
reference database 52 is updated.
Fig. 9 is a flowchart for describing a
modified example of processing on the update of the
reference database 52 and on the sensitivity test after
the update.
[Fig. 101 Fig. 10 is a flowchart for describing a
5 modified example of processing on a backup of the
reference database 52, the update of the reference
database 52, and the sensitivity test after the update.
[Fig. 111 Fig. 11 is a block diagram showing the
position of a sensitivity test execution unit 700.
Mode(s) for Carrying Out the Invention
[0019] Hereinafter, an embodiment of the present
technology will be described with reference to the
drawings.
[Background where the Present Technology is
Developed]
As described above, the abnormality detection
system has been developed, in which a reference
database representing a normal space is updated by an
operation data set newly detected and acquired, during
the operation of a monitoring target, and a false
detection on normality/abnormality is reduced.
[0020] It should be noted that in the above case,
the update using the newly acquired operation data set
is automatically performed, but it is conceived that a
person is caused to intervene here. Namely, in the case
where an exceptional event occurs and the abnormality
detection system determines that the event is
abnormality, but a person determines afterward that the
event is not abnormality by checking the event, for
example, a reference database is updated so as to
5 include an operation data set representing that event.
Through this operation as well, in the case where a
similar event occurs later, that event is not detected
as abnormality.
[00211 In the technique to update the reference
10 database during the operation in such a manner, however,
many updates to expand a normal space are made as time
proceeds, and as a result of the expansion of the
normal space, there is a possibility that the
sensitivity of the abnormality detection system for
15 detecting abnormality is deteriorated.
roo221 For example, when daily minute noise or
fluctuation, which is included in the operation data
set, is accumulated in the reference database, the
normal space represented by the reference database is
expanded, and a numerical value indicating
incompatibility is made smaller with respect to data
that is to be originally detected as abnormality.
100231 Further, since the number of elements of the
reference database is finite, when data of an element
constituting the reference database is replaced each
time an update is made, the normal space represented by
that element up to that time is narrowed. Thus, the
numerical value indicating incompatibility, which is an
analysis result, is made larger with respect to the
event that is to be originally detected as normality,
and there occurs a possibility that the event is
detected as abnormality.
100241 In other words, in the technique to update
the reference database during the operation, repeating
updates increases a possibility that a normal event is
erroneously detected to be abnormal or an abnormal
event to be normal. Therefore, it is an object to
overcome this circumstance and develop a system and a
method of detecting abnormality more appropriately.
[0025] [General Outline of the Present Technology]
In order to achieve this object, in the present
technology, the following two mechanisms are
incorporated in a monitoring target such that the
abnormality detection system having a mechanism to
update a reference database keeps constant sensitivity
to detect abnormality.
100261 (1) A mechanism to execute a sensitivity test
of abnormality detection after a reference database is
updated during an operation of a system as a monitoring
target.
[0027] (2) A mechanism to roll back (write back) the
reference database to the reference database before the
update, in the case where the result of the sensitivity
test is not a desired result (a normal event is
determined as abnormality or vice versa).
roo281 It should be noted that hereinafter, to
5 describe those two mechanisms, a power storage system
is exemplified as a monitoring target. The entire
configuration thereof and the configuration of a main
part will be described, and then the entire processing
flow will be described.
[0029] [General Outline and Configuration of Power
Storage System]
First, the general outline and the entire
configuration o'f the power storage system will be
described.
A power storage system is for charging power
generated by natural energy of sunlight, wind, and the
like in a storage battery (battery) and supplying power
to a connected load while mixing the power with power
(system power) supplied from a power system of an
electric power company. Use of the power storage system
contributes to stabilization of system-power supply or
reduction in environmental load. It should be noted
that the load used herein means lights, air
conditioners, and the like of buildings in the case
where the power storage system is installed in office
the case of homes.
[0.0301 Fig. 1 is a block diagram showing a general
outline of the entire power storage system. A power
storage system 100 includes a power storage unit 200,
5 repeaters (repeater units) 40a, 40b, and 40c, and an
energy management unit 300. The power storage unit 200
includes a charger (charging section) 10, a battery
(storage battery) 20, and a power source (charging
section) 30. The charger 10 includes various sensors
10 (detection section) 1 and a packet converter 4. The
battery 20 includes various sensors (detection section)
2 and a packet converter 5. The power source 30
includes various sensors (detection section) 3 and a
packet converter 6.
15 [0031] Further, the energy management unit 300
includes an abnormality detection computation section
(abnormality detection unit) 50. The charger 10, the
battery 20, and the power source 30 are connected to
one another by a power line 8. The packet converters 4,
5, and 6 and the repeaters 40a, 40b, and 40c are
connected to each other by transmission paths 7,
respectively. The repeaters 40a, 40b, and 40c and the
energy management unit 300 are also connected to each
other by the transmission paths 7.
[00321 A generator 400 that generates power by
energy of sunlight, wind, and the like is
14
connected to the charger 10. The charger 10 receives
the power generated by the generator 400 and charges
the battery 20 via the power line 8. It should be noted
that in the case where a charging current when the
5 charger 10 charges the battery 20 exceeds a charging
current aklowed by the battery 20 or in the case where
the battery 20 is fully charged and does not receive
the charging current, the power that is received from
the generator 400 but is not used for charging may be
10 directly supplied to a load 600.
100331 The battery 20 stores the power supplied from
the charger 10 or the power source 30 via the power
line'8 and supplies the stored power to the load 600
connected to the power line 8.
[0034] System power 500 is connected to the power
source 30. The power source 30 receives power
(particularly, night-time power at low electric rate)
from the system power 500 and charges the battery 20
via the power line 8. Further, in the case where the
power supplied from the battery 20 to the load 600 is
insufficient, the power of the system power 500 can
also be directly supplied to the load 600.
The power storage unit 200 is a monitoring
pecifically, the charger 10, the battery 20,
and the power source 30 related to the power
control/supply, which are included in the power storage
unit 200, are monitored by the various sensors 1, 2,
and 3. The various sensors 1, 2, and 3 each record a
value indicating a status of a detected monitoring
target (status value) as a log as needed, and supplies
the status value to the packet converters 4, 5, and 6,
respectively.
[0036] The values each indicating the status of the
monitoring target, which are detected by the various
sensors 1, 2, and 3, are converted in the form of
packets (transmission information) by the packet
converters 4, 5, and 6 in response to a status
acquisition request from the energy management unit 30
and transmitted to the repeaters 40a, 40b, and 40c. It
should be noted that the status of the monitoring
target used herein is an output voltage value, an
output current value, a temperature value, the
remaining amount of the storage battery, or the like.
[00371 The energy management unit 300 manages and
controls the power storage unit 200. Specifically, the
energy management unit 300 acquires the values each
indicating the status of the monitoring target from the
various sensors 1, 2, and 3 via the repeaters 40a, 40b,
and 40c and the packet converters 4, 5, and 6. The
energy management unit 300 starts and stops power
supply in the monitoring target, and switches various
modes, for example, on the basis of the acquired values
or an instruction from an administrator. Further, the
energy management unit 300 passes the received packets
to the abnormality detection computation section 50.
100381 The abnormality detection computation section
5 50 corresponds to the above-mentioned abnormality
detection system. The abnormality detection computation
section 50 performs computation to detect abnormality
of the monitoring target on the basis of an operation
data set indicating the status of the monitoring target,
10 which serves as packets passed from the energy
management unit 300, and a reference database. Further,
in the abnormality detection computation section 50, a
sensitivity test is performed on the basis of the
packets transmitted for a sensitivity test from the
15 repeaters 40a, 40b, and 40c. It should be noted that
details of the abnormality detection computation
section 50 will be described later.
to0391 The repeater 40a is inserted (installed) on
the transmission path 7 connecting the packet converter
4 and the energy management unit 300. The repeater 40b
is inserted (installed) on the transmission path 7
connecting the packet converter 5 and the energy
management unit 300. The repeater 40c is inserted
(installed) on the transmission path 7 connecting the
packet converter 6 and the energy management unit 300.
The repeaters 40a, 40b, and 40c are installed in the
middle of existing transmission paths 7 of a power
storage system that does not support the present
technology, and thus that power storage system can be
easily changed to a system that supports the present
5 technology.
[00401 The repeaters 40a, 40b, and 40c receive the
packets including the values each indicating the status
of the monitoring target, which are transmitted from
the packet converters 4, 5, and 6, and transmit the
10 received packets as they are to the energy management
unit 300 or process the received packets and then
transmit the packets to the energy management unit 300.
Further, the repeaters 40a, 40b, and 40c relay and
transmit the packets on a control instruction
transmitted from the energy management unit 300, and
the like as they are to the packet converters 4, 5, and
6.
[0041] In the case where a sensitivity test is
performed, the repeaters 40a, 40b, and 40c each correct
the value indicating the status of the monitoring
target in the packets transmitted from the packet
converters 4, 5, and 6. Further, the repeaters 40a, 40b,
and 40c each generate packets for a sensitivity test by
adding a test flag (flag information) indicating that
the value has been corrected for the sensitivity test,
and iransrnit the generated packets to the abnormality
detection computation section 50 via the energy
management unit 300 for the purpose of the sensitivity
test. It should be noted that the details of the
repeaters 40 will be described later.
5 [0042] It should be noted that the transmission
paths 7 may be transmission lines based on the RS-232C
(Recommended Standard 232 version C) standard,
transmission lines based on the CAN (Controller Area
Network) standard, transmission paths by Ethernet
(registered trademark) standard, or transmission paths
by any other standards.
roo431 Hereinabove, the general outline and the
entire configuration of the power storage system have
been described.
[00441 (Modified Example 1)
Here, as one modified example, a power storage
system lOOb with a changed configuration will be
described. Fig. 2 is a block diagram of a power storage
system lOOb with a changed configuration. In this
modified example 1, the abnormality detection
computation section 50 is provided outside an energy
management unit 300b. The abnormality detection
computation section 50 and the energy management unit
300b are connected to each other by the transmission
path 7. In this modified example 1, the abnormality
detection computation section 50 is provided outside
the energy management unit 300b, and thus even a power
storage system that does not support the present
technology can be easily changed to the power storage
system lOOb that supports the present technology by
5 adding the abnormality detection computation section 50
thereto.
[0045] (Modified Example 2)
Next, as another modified example, a power storage
system lOOc with a further changed configuration will
be described. Fig. 3 is a block diagram of a power
storage system lOOc with a changed configuration. In
this modified example 2, the repeaters 40a, 40b, and
40c are not provTded between the packet converters 4, 5,
and 6 and the energy management unit 300b as in the
modified example 1, but a repeater 40d is provided
between the energy management unit 300b and the
abnormality detection computation section 50. In this
modified example 2, the repeater 40d is installed
between the energy management unit 300b and the
abnormality detection computation section 50 that are
connected to each other via only one transmission path
7. Thus, only one repeater 40d enables the present
technology to be implemented.
[0046] [Repeaters]
Next, the details of the repeaters 40a, 40b, and
40c will be described. It should be noted that the same
holds true for the repeater 40d.
[0047] Each of the repeaters 40a, 40b, and 40c may
be constituted by dedicated hardware or software or may
be constituted by a general PC (Personal Computer). Fig.
5 4 shows a block diagram of a case where the repeaters
40a, 40b, and 40c are each constituted by a general PC.
[0048] As shown in the figure, the repeaters 40a,
40b, and 40c each include a CPU (Central Processing
Unit) (first control section) 41, a ROM (Read Only
10 Memory) 42, a RAM (Random Access Memory) 43, an
operation input section 44, an interface section 45, a
display section 46, and a storage section 47, and those
blocks are connected to one another via a bus 48.
[00491 The ROM 42 fixedly stores a plurality of
programs such as firmware for executing various types
of processing, and data. The RAM 43 is used as a work
area of the CPU 41 and temporarily stores an OS
(Operating System), various applications in execution,
or various types of data in processing. In this
embodiment, in the case where the repeaters 40a, 40b,
and 40c correct the packets, the received packets are
temporarily stored in the RAM 43, and a value
indicating the status of the monitoring target, which
is shown by the content of the packets, is changed as
necessary.
[0050] The storage section 47 is a non-volatile
memory such as an HDD (Hard Disk Drive), a flash memory,
or any other solid-state memory. The storage section 47
stores the OS, various applications, and various types
of data.
5 [005l] The interface section 45 is connected to the
transmission paths 7 that transmit the packets, and
receives the packets transmitted from each of the
packet converters 4, 5, and 6. Further, the interface
section 45 transmits the packets once received in each
10 of the repeaters 40a, 40b, and 40c to the energy
management unit 300.
[0052] The CPU 41 develops a program, which
corresponds to a command given from the operation input
section 44 out of a plurality of programs stored in the
15 ROM 42 or the storage section 47, on the RAM 43, and
appropriately controls the display section 46 and the
storage section 47 according to the developed program.
[0053] The operation input section 44 is, for
example, a pointing device such as a mouse, a keyboard,
a touch panel, or any other operating device.
[0054] The display section 46 is, for example, a
liquid crystal display, an EL (Electro-Luminescence)
display, a plasma display, or a CRT (Cathode Ray Tube)
display. The display section 46 may be incorporated in
each of the repeaters 40a, 40b, and 40c or may be
externally connected thereto.
[OOSS] Hereinabove, the configuration of the
repeaters 4Oa, 40b, and 40c has been described. Next,
description will be given on a main function of the
repeaters 40a, 40b, and 40c, i.e., generation of a test
5 packet by correcting a value in the packet when a
sensitivity test is performed.
[00561 Fig. 5 is a diagram showing a state where the
repeaters 4Oa, 4Ob, and 40c each correct the content of
a received packet, when a sensitivity test is performed.
10 lo0571 When an instruction to execute a sensitivity
test is given, first, the repeaters 40a, 40b, and 40c
temporarily store packets received via the transmission
paths '7 'Erom the packet converters 4, 5, and 6,
respectively, in respective buffers provided on the RAM
43. It should be noted that the instruction for a
sensitivity test may be given by an administrator of
the power storage system 100 that performs a
sensitivity test or by a sensitivity test execution
unit (described later) that is constituted by a
computer or the like and automatically executes a
sensitivity test.
[0058l Next, the repeaters 40a, 40b, and 40c
understand the content of the stored packets, that is,
values included in the packets and each indicating a
status of the monitoring target, and then corrects the
values. The correction of values is performed along a
policy that will be described later. It should be noted
that in the figure, the content of the third data in a
packet is rewritten from "3" to "X".
[00591 Next, the repeaters 40a, 40b, and 40c each
5 add a test flag to the packet in which the content is
re%-~ritteinn the buffer. Next, the repeaters 40a, 40b,
and 40c each transmit the packet, which is rewritten
and provided with the test flag, to the abnormality
detection computation section 50 through the energy
10 management unit 300 via the transmission paths 7.
[00601 In the repeaters 40a, 40b, and 40c, a test
flag is set for a test packet to be transmitted, such
that the abnormality detection computation section 50
can distinguish between the packets in a normal
15 operation and those in a sensitivity test. Therefore,
with use of the repeaters 40a, 40b, and 40c of the
present technology, a sensitivity test can be performed
during an actual operation of the power storage system
100.
[0061] (Policy to Correct Value Indicating Status of
Monitoring Target)
Next, in order to generate the packet received by
each of the repeaters 40a, 40b, and 40c as a test
packet, a policy to correct a value in the packet will
be described.
[0062] A test packet generated in each of the
repeaters 40a, 40b, and 40c is generated to test
whether a reference database used for abnormality
detection by the abnormality detection computation
section 50 has an appropriate abnormality detection
5 sensitivity in the power storage system 100. Therefore,
it is not appropriate to use, as a test packet value,
an abnormal value distinctly straying from the
specifications of one monitoring target.
[00631 For example, it is not appropriate to set an
abnormal value as in the case where a value detected by
the sensor is set to 150 V irrespective of the fact
that the output voltage value of the battery 20 is in
the range from 95 V to 105 V in the specifications.
When such an abnormal value is used, in the abnormality
detection computation section 50, a numerical value
indicating incompatibility of the operation data set is
increased and is naturally determined to be abnormal,
and thus it goes against an object of the sensitivity
test.
100641 In this regard, for a policy when the value
indicating the status of the monitoring target is
corrected, the value indicating the status of the
monitoring target, which is included in the received
packet, is corrected by addition of a "minute change"
thereto. In other words, by using a borderline value
that is determined to be abnormal, a sensitivity test
can be appropriately performed.
100651 In the "minute change", for example, in the
case of the output voltage value of the battery 20
described above, in the case where the output voltage
5 value is 100 V, for example, approximately 1 V that is
1% thereof is an appropriate value. By adding this 1 V
to the original value or reducing this 1 V, an abnormal
value for a test is generated. It should be noted that
a value actually used as the value of "minute change"
is individually set depending on the types of the value
indicating the status of the monitoring target, for
example, a voltage value, a current value, and a
temperature value. It should be noted that the value of
the "minute change" may be given as a fixed value or
may be given by calculation using a computing equation,
such as obtaining X% of an actually determined value.
100661 The repeaters 40a, 40b, and 40c each add the
"minute change" to the actually determined value to
generate an abnormal value, and transmit the abnormal
value to the abnormality detection computation section
50. The abnormality detection computation section 50
sets the abnormal value as an operation data set to
obtain a numerical value indicating incompatibility
(evaluate incompatibility), and determines whether an
event indicating the set abnormal value is abnormal or
not.
[0067] Hereinabove, the function of generating the
test packet, which is provided to the repeaters 40a,
40b, and 40c, will be described.
[0068] [Abnormality Detection Computation Section
5 501
Next, details of the abnormality detection
computation section 50 will be described. The
abnormality detection computation section 50 may be
constituted by dedicated hardware or software or may be
constituted by a general PC. The configuration of a
general PC is similar to that used for describing the
repeaters 40a, 40b, and 40c, and thus description
thereof will be omitted.
[00691 Next, a functional block of the abnormality
detection computation section 50 will be described. Fig.
6 is a functional block diagram of the abnormality
detection computation section 50.
[0070] The abnormality detection computation section
50 includes an input section 54, a
computation/comparison section (abnormality detection
section) 51, a first storage section (storage section)
55 that stores a reference database (reference data
set) 52, and a second storage section 56 that stores a
backup 53 of the reference database.
[0071] The input section 54 receives the packets
transmitted from the repeaters 40a, 40b, and 40c
through the energy management unit 300. The input
section 54 passes a current operation data set, which
includes the value indicating the status of the
monitoring target in the received packets, to the
5 computation/comparison section 51.
[0072 ] The computation/comparison section 51
computes a normal space indicated by the reference
database 52 and a current operation data set by the
pattern recognition technology (multivariate analysis).
10 The computation/comparison section 51 then detects
abnormality on the basis of the magnitude of the
numerical value indicating incompatibility that is
0btained.a~a result of the computation.
[00731 The reference database 52 is an aggregate of
elements for defining the range of a normal space used
for abnormality detection. The reference database 52 is
updated by a new operation data set.
100741 The backup 53 of the reference database is an
aggregate of backups of the reference database obtained
before being updated, the backups being made when the
reference database 52 is updated. In the figure, it is
found that three backups 53a, 53b, and 53c are present
and the update of the reference database 52 was made
three times in the past. It should be noted that in the
configuration of this figure, the backup 53 of the
reference database is stored in the second storage
section 56 within the abnormality detection computation
section 50, but is not limited to this configuration.
The backup 53 of the reference database may be
configured to be saved outside the abnormality
5 detection computation section 50.
[OO751 When an instruction to start a sensitivity
test is given, the abnormality detection computation
section 50 receives a packet having a test flag and
performs abnormality detection computation by using the
10 value indicating the status of the monitoring target,
which is included in the packet. It should be noted
that the instruction for a sensitivity test may be
given by an administrator of the power storage system
100 that performs a sensitivity test or by a
sensitivity test execution unit that is constituted by
a computer or the like and automatically executes a
sensitivity test.
[0076] , If the numerical value indicating
incompatibility, which is obtained as a result of the
abnormality detection computation, does not satisfy an
appropriate condition by comparison with a
predetermined reference value, the reference database
52 is rolled back by use of the saved past backup 53.
With this rollback, the range of the normal space
indicated by the reference database 52 is returned to
the previous one. Thus, the sensitivity of the
abnormality detection can be kept the same as before.
[0077] Hereinabove, the details of the abnormality
detection computation section 50 have been described.
[0078] [Conclusion of Configuration of Power Storage
5 System]
It'should be noted that regarding the
configuration of the power storage system 100, from a
different perspective, the power storage system 100
includes the battery 20, the charger 10 that charges
10 the battery 20, and the power source 30, and from a
plurality of perspectives, the power storage system 100
includes the power storage unit 200 and the abnormality
detection computation section 50, the power storage
unit 200 including the various sensors 1, 2, and 3 that
15 detect at least one status of the battery 20, the
charger 10, and the power source 30, the abnormality
detection computation section 50 including the input
section 54 that acquires transmission information
including a plurality of detected status values from
the power storage unit 200 via a transmission path, and
the computation/comparison section 51 that detects
abnormality of the power storage unit 200 by a
multivariate analysis for the plurality of acquired
status values.
[0079] [Processing Flow]
Next, a processing flow on the power storage
system 100 will be described. First, a processing flow
from when the power storage system 100 is newly
installed to when the power storage system 100 is
normally operated will be described. Next, description
5 will be given on a processing flow of the update of the
reference database 52 and a sensitivity test, when an
operation data set to update the reference database 52
is obtained in a normal operation.
[0080] (Flow from Installation of Power Storage
System to Normal Operation)
First, a flow from the installation of the power
storage system 100 to a normal operation will be
described. Fig. 7 is a flowchart for describing a flow
from the installation of the power storage system 100
to a normal operation.
[OOSl] First, an administrator installs the power
storage system 100 (Step Sl).
[0082] Next, the administrator activates the power
storage system 100 (Step S2).
LO0831 Next, the administrator causes the power
storage system 100 to store operation data (operation
data set) so as to establish the reference database 52
(Step S3).
[0084] Next, the administrator determines whether
enough operation data to establish the reference
database 52 is stored or not (Step S4).
[0085] In the case where enough operation data is
not yet stored (N of Step S4), the processing is
returned to Step 53, so that the operation data is
continued to be stored
5 [00861 In the case where enough operation data is
stored -(Y of Step S4), next, the abnormality detection
computation section 50 establishes the reference
database 52 on the basis of the stored operation data
set (Step S5).
[00871 Next, the administrator or the sensitivity
test execution unit performs a sensitivity test by
using the repeaters 40a, 40b, and 40c (Step S6).
[0088l Next, the administrator or the sensitivity
test execution unit determines a maximum reference
value (MAX) and a minimum reference value (MIN), which
are compared with a numerical value A indicating
incompatibility (Step $ 7 ) .
[00891 Next, the administrator starts operation of
the abnormality detection system, that is, the
abnormality detection computation section 50 (Step S8).
[00901 Hereinabove, the flow from the installation
of the power storage system 100 to a normal operation
has been described.
[00911 (Processing Flow of Update of Reference
Database and Sensitivity Test)
Next, description will be given on a processing
flow when the reference database 52 is updated after
the power storage system 100 is normally activated, or
a sensitivity test is performed after the reference
database 52 is updated. Fig. 8 is a flowchart for
5 describing a processing flow when the reference
database 52 is updated after the powex storage system
100 is normally activated, or a sensitivity test is
performed after the reference database 52 is updated.
[0092] First, the abnormality detection computation
10 section 50 receives a packet (packet in practical use)
including the value indicating the status of the
monitoring target, to acquire operation data (Step 520) .
[0093] Next, the abnormality detection computation
section 50 performs pattern recognition computation by
a multivariate analysis on the basis of an operation
data set including the operation data acquired in Step
20 and the reference database 52, and calculates a
numerical value A indicating incompatibility (Step S21).
[0094] Next, the abnormality detection computation
section 50 determines whether the numerical value A is
equal to or larger than a predetermined maximum
reference value (MAX) (Step S22).
[00951 In the case where the numerical value A is
smaller than the maximum reference value (MAX) (N of
Step S22), next, the abnormality detection computation
section 50 determines whether the numerical value A is
equal to or smaller than a predetermined minimum
reference value (MIN) (Step S23).
[00961 In the case where the numerical value A is
equal to or smaller than the minimum reference value
5 (MIN) (Y of Step S23), the abnormality detection
computation section 50 returns the processing to Step
S20 and repeats the abnormality detection processing of
the monitoring target.
[0097] In Step S22, in the case where the numerical
10 value A is equal to or larger than the maximum
reference value (MAX) (Y of Step S22), if the test flag
is not set, the abnormality detection computation
section 50 activates an alarm, and the administrator
checks the power storage system 100 (Step S24).
15 [00981 Next, the administrator determines whether
the power storage system 100 is actually broken down or
not (Step S25).
[0099] In the case where the power storage system
100 is actually broken down (Y of Step S25), the
20 administrator repairs the power storage system 100
(Step S26). After the power storage system 100 is
repaired and returned to a normal operation, the
processing can be resumed from Step 520.
[OlOO] In Step S23, in the case where the numerical
value A exceeds the minimum reference value (MIN) (N of
Step S23), and in Step 525, in the case where the power
storage system is not broken down (N of Step S25), next,
the abnormality detection computation section 50
determines whether the occurrence of the numerical
value A is temporary (not intermittent) or not (Step
5 527).
[OlOl] In the case where the numerical value A is
determined to be temporary (Y of Step S27), the
abnormality detection computation section 50 returns
the processing to Step S20 and repeats the abnormality
10 detection processing of the monitoring target.
[0102] In the case where the numerical value A is
not determined to be temporary (N of Step S27), the
abnormality detection computation section 50 proceeds
to update processing of the reference database 52.
15 [0103] In the update processing, first, the
abnormality detection computation section 50 backs up
the current reference database 52 (Step S28).
[0104] Next, the abnormality detection computation
section 50 updates the reference database 52 so as to
include the operation data set serving as a trigger of
the update processing of this time (Step S29).
[0105] Next, by the instruction given at an
arbitrary timing, a sensitivity test is performed by
using the repeaters 40a, 40b, and 40c (Step S30). It
should be noted that the instruction may be given by
the administrator of the power storage system 100 that
performs a sensitivity test or by the sensitivity test
execution unit that is constituted by a computer or the
like and automatically executes a sensitivity test.
[0106] Next, the administrator or the sensitivity
5 test execution unit determines whether the sensitivity
of the abnormality detection is deteriorated or not
(whether normality or abnormality on a generated event
is erroneously detected) on the basis of a result of
the sensitivity test (Step S31).
10 [01071 In the case where the sensitivity of the
abnormality detection is not deteriorated (N of Step
S31), the administrator or the sensitivity test
execution unit returns the processing to Step S20 and
causes the abnormality detection computation section 50
15 to continue the abnormality detection processing of the
monitoring target.
[01081 In the case where the sensitivity of the
abnormality detection is deteriorated (Y of Step S31),
next, the administrator or the sensitivity test
execution unit instructs the abnormality detection
computation section 50 to roll the reference database
52 back to a past time point by using an arbitrary past
backup (Step 532).
[0109] After the rollback, the administrator or the
sensitivity test execution unit returns the processing
to Step S30 and performs a sensitivity test again. In
the sensitivity test at that time, since the reference
database at a past time point at which the sensitivity
of the abnormality detection is not deteriorated is
used, it is determined in the next Step S31 that the
5 sensitivity of the abnormality detection is not
deteriorated. The administrator or the sensitivity test
execution unit returns the processing to Step 520 to
continue the normal operation.
[OllO] Hereinabove, description has been given on
10 the processing flow when the reference database 52 is
updated after the power storage system 100 is normally
activated, or the sensitivity test is performed after
the reference database 52 is updated.
[Olll] (Modified Example 3)
Here, a modified example of processing on the
update of the reference database 52 and a sensitivity
test after the update will be described. Fig. 9 is a
flowchart for describing a modified example of
processing on the update of the reference database 52
and a sensitivity test after the update.
[0112] The processing flow described above and the
processing flow in this modified example 3 are
different from each other in that, after the reference
database 52 is rolled back in Step 532, the processing
is returned to Step S29 in this modified example, to
update the reference database 52 so as to include the
operation data set serving as a trigger of the update
processing of this time.
[01131 This enables the operation data set obtained
this time to be reflected on the reference database and
5 effectively used without being discarded.
[0114] In the case where the configuration of this
modified example is adopted, it is predicted that there
is a backup in which the sensitivity of the abnormality
detection is not deteriorated even if the operation
10 data set obtained this time is reflected. In this
modified example, the operation data set obtained this
time is reflected on the rolled-back reference database,
and a sensitivity test is then performed. So, if there
is no backup having a sufficiently narrow normal space,
the power storage system 100 cannot be returned to a
normal operation. In order to return the power storage
system 100 to a normal operation in the case where
there is no appropriate backup, the reference database
52 does not have to be updated after the rollback.
[01151 Hereinabove, the modified example of the
processing on the update of the reference database 52
and the sensitivity test after the update has been
described.
[01161 (Modified Example 4 )
Here, a modified example of processing on the
backup of the reference database 52, the update of the
reference database 52, and the sensitivity test after
the update will be described. Fig. 10 is a flowchart
for describing a modified example of processing on the
backup of the reference database 52, the update of the
5 reference database 52, and the sensitivity test after
the update. In this modified example, a timing at which
the reference database 52 is backed up is different
from the processing flow described above.
[0117] First, the abnormality detection computation
10 section 50 backs up the current reference database 52
(Step S120).
[01181 Next, the abnormality detection computation
section'50 receives a packet (packet in practical use)
including the value indicating the status of the
15 monitoring target, to acquire operation data (Step
S121).
[01191 Next, the abnormality detection computation
section 50 performs pattern recognition computation by
a multivariate analysis on the basis of an operation
data set including the operation data acquired in Step
S120 and the reference database 52, and calculates a
numerical value A indicating incompatibility (Step
5122).
[0120] Next, the abnormality detection computation
section 50 determines whether the numerical value A is
equal to or larger than a predetermined maximum
reference value (MAX) (Step 5123).
[01211 In the case where the numerical value A is
smaller than the maximum reference value (MAX) (N of
Step S123), next, the abnormality detection computation
5 section 50 determines whether the numerical value A is
equal to or smaller than a predetermined minimum
reference value (MIN) (Step S124).
[0122] In the case where the numerical value A is
equal to or smaller than the minimum reference value
10 (MIN) (Y of Step S124), the processing proceeds to
determination on whether to execute a sensitivity test
of the reference database 52.
[0123] In Step 5123, in the case where the numerical
value A is equal to or larger than the maximum
15 reference value (MAX) (Y of Step S123), if the test
flag is not set, the abnormality detection computation
section 50 activates an alarm, and the administrator
checks the power storage system 100 (Step 5125).
[0124] Next, the administrator determines whether
the power storage system 100 is broken down or not
(Step 5126).
101251 In the case where the power storage system
100 is actually broken down (Y of Step S126), the
administrator repairs the power storage system 100
(Step Sl27). After the power storage system 100 is
repaired and returned to a normal operation, the
processing can be resumed from Step 5121.
[0126] In Step 5124, in the case where the numerical
value A exceeds the minimum reference value (MIN) (N of
Step S124), and in Step S126, in the case where the
5 power storage system is not broken down (N of Step
S126), next, the abnormality detection computation
section 50 determines whether the occurrence of the
numerical value A is temporary (not intermittent) or
not (Step Sl28) .
10 [01271 In the case where the numerical value A is
determined to be temporary (Y of Step S128), the
processing proceeds to determination on whether to
execute a sensitivity test of the reference database 52.
[0128] In the case where the numerical value A is
not determined to be temporary (N of Step S128), the
abnormality detection computation section 50 updates
the reference database 52 so as to include the
operation data set obtained this time (Step S129), and
proceeds to determination on whether to execute a
sensitivity test of the reference database 52.
101291 In the case where the numerical value A is
equal to or smaller than the minimum reference value
( M I N ) in Step $124 (Y of Step S124), in the case where
the occurrence of the numerical value A is temporary in
Step S128 (Y of Step S128), and after the reference
database 52 is updated in Step 5129, the sensitivity
test execution unit or the administrator determines a
timing at which a sensitivity test is executed (Step
S130). An instruction for the sensitivity test may be
given at an arbitrary timing by the administrator of
5 the power storage system 100 that performs a
sensitivity test or by the sensitivity test execution
unit that is constituted by a computer or the like and
automatically executes a sensitivity test.
[01301 In the case where a timing at which a
10 sensitivity test is executed is not determined (N of
Step S130), the abnormality detection computation
section 50 returns the processing to Step 5121 and
repeats the abnormality detection processing of the
monitoring target.
15 [0131] In the case where a timing at which the
sensitivity test is executed is determined (Y of Step
S130), the administrator or the sensitivity test
execution unit performs a sensitivity test of the
current (latest) reference database 52 by using the
repeaters 40a, 40b, and 40c (Step Sl31).
[0132] Next, the administrator or the sensitivity
test execution unit determines whether the sensitivity
of the abnormality detection is deteriorated or not
(whether normality or abnormality on a generated event
is erroneously detected) on the basis of a result of
the sensitivity test (Step Sl32).
LO1331 In the case where the sensitivity of the
abnormality detection is not deteriorated (N of Step
S132), the abnormality detection computation section 50
returns the processing to Step 5120 and backs up the
5 current (latest) reference database 52.
101341 'In the case where the sensitivity of the
abnormality detection is deteriorated (Y of Step S132),
the administrator or the sensitivity test execution
unit instructs the abnormality detection computation
section 50 to roll the reference database 52 back to a
past time point by using an arbitrary past backup (Step
5133).
101351 After the rollback, since the reference
database 52 used for abnormality detection is a
reference database at a past time point at which the
sensitivity of the abnormality detection is not
deteriorated, the processing returns to Step 5121 to
continue the normal operation.
[0136] Hereinabove, the modified example of the
processing on the backup of the reference database 52,
the update of the reference database 52, and the
sensitivity test after the update has been described.
[0137] [Sensitivity Test Execution Unit]
Here, brief description will be given on the
sensitivity test execution unit described above. Fig.
11 is a block diagram showing the position of a
sensitivity test execution unit 700. It should be noted
that the sensitivity test execution unit 700 may be
constituted as a part of the power storage system 100.
LO1381 As shown in the figure, the sensitivity test
5 execution unit 700 is connected to both of the
repeaters 40a, 40b, and 40c and the abnormality
detection computation section 50 and controls those
devices. A control section (second control section) of
the sensitivity test execution unit 700 checks whether
the sensitivity of the abnormality detection of the
abnormality detection computation section 50 is kept or
not, at an arbitrary timing or a timing at which the
reference database 52 is updated, by executing the
sensitivity test. The control section of the
sensitivity test execution unit 700 then causes the
abnormality detection computation section 50 to roll
back the reference database 52 on the basis of the
result of the sensitivity test, or in the case of the
modified example 3, to update the rolled-back reference
database 52. The sensitivity test execution unit 700
can be constituted by using a general PC.
(01391 It should be noted that the details of
operations of the sensitivity test execution unit 700
have been described in the description on the
processing flow, and thus description thereof will be
omitted.
[0140] [Effects]
Next, among effects obtained by the present
technology, some representative ones will be described.
(1) A test packet is generated by using the
5 repeaters 40a, 40b, and 40c, and thus an abnormal event,
which occurs extremely less frequently in an actual
operation, is caused to occur, and the behavior of the
abnormality detection computation section 50 to that
event can be verified.
10 [01411 (2) A normal packet and a test packet are
distinguished by a test flag, and thus a sensitivity
test for the current abnormality detection sensitivity
can be performed while the power storage system 100 or
the abnormality detection computation section 50 is
caused to be normally operated. In other words, in the
case where an abnormal value is detected by the test
packet, it is possible to refrain from updating the
reference database or suppress activation of an alarm
of abnormality detection.
I01421 (3) With a received value representing an
actual status of a monitoring target as a base, the
repeaters 40a, 40b, and 40c add "minute change" to that
value, to generate an abnormal value. Thus, an abnormal
value in accordance with an object of the sensitivity
test can be generated.
(4) With a received value representing an actual
status of a monitoring target as a base, the repeaters
40a, 40b, and 40c use a predetermined computation
equation when "minute change" is added to that value.
Thus, an optimal abnormal value can be generated
5 irrespective of the received value.
[01431 (5) The reference database is backed up when
the reference database is updated. Thus, the reference
database can be rolled back to various past time points
by using backups as necessary.
10 101441 (6) The present technology can be applied by
merely adding the repeaters 40a, 40b, and 40c to an
existing power storage system newly and substituting
the abnormality detection computation section 50
corresponding to the present technology for an existing
15 abnormality detection computation section. Thus,
investment to the present technology can be suppressed
to the minimum.
[0145] [Supplementary Note]
In addition, the present technology is not limited
2 0 to the embodiment described above and can be variously
modified without departing from the gist of the present
technology as a matter of course.
[0146] [Another Configuration of the Present
Technology]
It should be noted that the present technology can
have the following configurations.
(1) A power storage system, including:
a power storage unit including
a storage battery,
a charging section that charges the storage
5 battery, and
a detection section that detects at least one
status of the storage battery and the charging section
from a plurality of perspectives; and
an abnormality detection unit including
an input section that acquires transmission
information from the power storage unit via a
transmission path, the transmission information
including a plurality of detected status values, and
an abnormality detection section that detects
15 abnormality of the power storage unit by a multivariate
analysis performed on the plurality of acquired status
values.
(2) The power storage system according to (I), in
which
the abnormality detection unit further includes a
first storage section that stores a reference data set
defining a normal state of the power storage unit by
the plurality of status values, and
the abnormality detection section of the
abnormality detection unit is configured to
evaluate incompatibility between the
plurality of acquired status values and the stored
reference data set, and
update the reference database on the basis of
an evaluation result.
5 (3) The power storage system according to (1) or (2),
further including a repeater unit including a first
control section, the first control section
being provided on the transmission path
connecting the power storage unit and the abnormality
10 detection unit,
receiving the transmission information
transmitted from the detection section,
changing the status value on the basis of the
status value included in the received transmission
15 information, and
transmitting the transmission information
including the changed status value to the input section.
(4) The power storage system according to (3), in
which
20 the first control section of the repeater unit is
configured to add flag information to the transmitted
transmission information, the flag information
indicating that the status value has been changed.
(5) The power storage system according to (3) or ( 4 ) ,
in which
the abnormality detection unit further includes a
second storage section that stores a backup of the
reference data set, and
the power storage system further includes a
sensitivity test execution unit including a second
5 control section, the second control section
causing the first control section of the
repeater unit to transmit the transmission information
changed for a test to the input section,
causing the abnormality detection section of
the abnormality detection unit to determine whether the
power storage unit is abnormal or not on the basis of
the received transmission information for a test, and
in any of a case where the status value by
which the power storage unit is determined to be
abnormal is set in the received transmission
information for a test, and the abnormality detection
unit determines that the power storage unit is normal,
and a case where the status value by which the power
storage unit is determined to be normal is set in the
received transmission information for a test, and the
abnormality detection unit determines that the power
storage unit is abnormal, causing the abnormality
detection section of the abnormality detection unit to
write the backup stored in the second storage section
back to the reference data set stored in the first
storage section.
(6) The power storage system according to (51, in
which
the second control section of the sensitivity test
execution unit is configured to cause the abnormality
5 detection section of the abnormality detection unit to
update the reference data set stored in the first
storage section, the reference data set being written
back by the backup, on the basis of the transmission
information lastly received at an actual operation.
10 Description of Symbols
1 to 3 various sensors
4 to 6 packet converter
7 transmission path
8 power line
10 charger
20 battery
30 power source
40a to 40d repeater
41 CPU
42 ROM
43 RAM
44 operation input section
45 interface section
46 display section
47 storage section
48 bus
50 abnormality detection computation section
51 computation/comparison section
52 reference database
53 to 53c reference database backup
100 to lOOc power storage system
200 power storage unit
300 energy management unit
400 generator
500 system power
600 load
700 sensitivity test execution unit
A numerical value indicating incompatibility
between operation data set and reference database 52
51
Claims
[I] A power storage system, comprising:
a power storage unit including
a storage battery,
5 a charging section that charges the storage
battery, and
a detection section that detects at least one
status of the storage battery and the charging section
from a plurality of perspectives; and
10 an abnormality detection unit including
an input section that acquires transmission
information from the power storage unit via a
transmission path, the transmission information
including a plurality of detected status values, and
15 an abnormality detection section that detects
abnormality of the power storage unit by a multivariate
analysis performed on the plurality of acquired status
values.
[21 The power storage system according to claim 1,
2 0 wherein
the abnormality detection unit further includes a
first storage section that stores a reference data set
defining a normal state of the power storage unit by
the plurality of status values, and
the abnormality detection section of the
abnormality detection unit is configured to
evaluate incompatibility between the
plurality of acquired status values and the stored
reference data set, and
update the reference database on the basis of
5 an evaluation result.
[31 The power storage system according to claim 2,
further comprising a repeater unit including a first
control section, the first control section
being provided on the transmission path
10 connecting the power storage unit and the abnormality
detection unit,
receiving the transmission information
transmitted'from the detection section,
changing the status value on the basis of the
status value included in the received transmission
information, and
transmitting the transmission information
including the changed status value to the input section.
141 The power storage system according to claim 3,
wherein
the first control section of the repeater unit is
configured to add flag information to the transmitted
transmission information, the flag information
indicating that the status value has been changed.
[ 5 ] The power storage system according to claim 3,
wherein
the abnormality detection unit further includes a
second storage section that stores a backup of the
reference data set, and
the power storage system further comprises a
5 sensitivity test execution unit including a second
control section, the second control section
causing the first control section of the ,
repeater unit to transmit the transmission information
changed for a test to the input section,
10 causing the abnormality detection section of
the abnormality detection unit to determine whether the
power storage unit is abnormal or not on the basis of
the received transmission information for a test, and
in any of a case where the status value by
15 which the power storage unit is determined to be
abnormal is set in the received transmission
information for a test, and the abnormality detection
unit determines that the power storage unit is normal,
and a case where the status value by which the power
20 storage unit is determined to be normal is set in the
received transmission information for a test, and the
abnormality detection unit determines that the power
storage unit is abnormal, causing the abnormality
detection section of the abnormality detection unit to
write the backup stored in the second storage section
back to the reference data set stored in the first
storage section.
[6] The power storage system according to claim 5,
wherein
the second control section of the sensitivity test
5 execution unit is configured to cause the abnormality
detection section of the abnormality detection unit to
update the reference data set stored in the first
storage section, the reference data set being written
back by the backup, on the basis of the transmission
10 information lastly received at an actual operation.