DESC:TECHNICAL FIELD

[001] The present subject matter described herein, in general, relates to communication systemsand more particularly to a method, system and apparatus for controlling system using control and automation capabilities within a substation.

BACKGROUND

[002] International Electro technical Commission (IEC)-61850 is an Ethernet-based international standard designed for integration of electric utility substation devices. IEC-61850 provides indication, command, Measurement, time sync, fault record, interoperability, process bus and other engineering Support. Currently, IEC-61850 standards are used in wind power plant, hydro power generation and for the management of distributed energy resources (DER).

[003] TheGeneric Object Oriented Substation Events(GOOSE) communication is specified in the IEC 61850 Standard by the International Electro-technical Commission (IEC) for communication between the devices and/or substations. The GOOSE describes a control model mechanism for fast transmission of substation events, such as commands and alarms, which enables to transmit data in any format for example status, value, message, and the like grouped into a data set and transmitted within a specific time period.GOOSE data is directly embedded into Ethernet data packets and works on publisher-subscriber mechanism on multicast or broadcast multiple-access control (MAC) addresses. A single GOOSE message is sent by an intelligent electronic device (IED) which can be received and used by another IED at the receiver end. For example, in one common network the sender can publish information on one device, while on the subscriber devices at receiver end, the subscriber it is enabled to receive the published information. The interaction of each receiver depends on their configuration and functionality.

[004] GOOSE is generally designed as publisher-subscriber model, and the publisher IEDs may transmit GOOSE messages as multicast or broadcast MAC addresses to all connected subscriber IEDs. All IEDs that communicate in one network are required to be connected using a local area network (LAN) configuration or any other network so as to form a single network. However the network implementation for long distance communication is very complex which may involve addition cost of hardwires and may involve highly technical professionals to operate the network. For example, the cost required for Ethernet connectivity for 100km is very large and time consuming. For communication between multiple substations, the main Ethernet hub of one network is to be connected to the Ethernet hub of another network. Implementation of such network is complex and may involve high maintenance cost due to the use of long cables and repeaters.

[005] The prior art document WO 2014012612 A1 discloses bridge-intelligent electronic device of routing messages IEC61850 GOOSE messages between sub-networks (SN_1, SN_2... SN n), wherein the Bridge- Intelligent Electronic Device (IED) comprises a functionality for signal mapping and more than one communication interfaces (CI-1, CI-2...Cl-n), wherein each one of said communication interface (CI-1, CI-2... Cl-n) is designed as an Intelligent Electronic Device (IED) with its own Configured IED Description, file according IEC 61850 requirement. However, in WO2014012612 documentIED with MMS and GOOSE service is implemented with Ethernet link which cover theshort distance to transmit GOOSE information over long distance number of repeater should use more so complexity should get increases and increases the cost.

[006] Thus, in view the hitherto drawbacks of the at least one limitations/drawbacks above, there exist a dire need to provide an improved technique for communication of substation events for timely detection, isolation and recovery of faults in power system.

SUMMARY OF THE INVENTION

[007] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

[008] Another object of the present invention is to facilitate IEC 61850 based communication between Intelligent Electronic Devices (IED) of substation in one network to IEDs of substation in another network using high-speed communication system.

[009] Accordingly, the present invention provides a systemfor rapid communication of substation events between substation in one network to substation in another network using a suitable communication standard (IEC 61850)and a high speed wireless transmission medium.

[0010] According to the invention, a method for fast detection, isolation and recovery of faults is provided, wherein GOOSE messages according to IEC 61850 are transmitted over substation communication networks within substations of an electric power network, and further transmitting the message over a wireless communication link between intelligent electronic devices (IED) connected to the substations in one communication networks to IED connected to other communication network. This communication event enables connected relay devices to undertake necessary action as per the event received.

[0011] In one implementation, the present invention provides a GOOSE service in IEC 61850 and IEEE 802.16e (WiMAX) which enables to achieve an extremely efficient / high-speed and long distance communication of fault information.

[0012] In one implementation, the present invention provides a technique to effectively extend the substation LAN into the distribution network thereby enabling fast detection, isolation and recovery from faults on the instrumented feeders.

[0013] IED’s with IEC-61850 generates the MMS/GOOSE services containing information to be transmitted overlarge distance by standard (Wireless Technology)WiMAX protocol with high speed and accuracy. Each IED load the comp logic in it for Generation GOOSE information for transferring to next IED connecting with LAN so far also file mapping CID and data map CFG.

[0014] In one implementation, a system for communicationin power distribution networks is disclosed. The system comprises a plurality of protective relay devices, at least one transmitter device and at least one receiver device, in a power distribution network, each protective relay device comprising a processor and associated with switching devices for fault detection, fault isolation and service restoration. The system is comprisesthe transmitter device configured to encode at least one message and transmit the message encoded to the receiver device. The system further comprises thereceiver device configured to receive the message encoded, decode the message and perform at least one operation according to the message received.

[0015] In one implementation, the operation performed by the receiver device is preferable selected from the data logging operations, the buffered and un-buffered report generation send over WIMAX operation, the client-server mms communication operations, the goose operations, the sampling of measured values, the time synchronization operation, and the like.

[0016] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

[0017] Figure 1 illustratesa block diagram representation of wireless transmission event between substations located over several kilometers, in accordance with the subject matter of the present invention.

[0018] Figure 2 illustrates a flow chart representation of GOOSE message transmitting from a transmitter, in accordance with the subject matter of the present invention.

[0019] Figure 3, illustrates a flow chart representation of GOOSE message receiving by a receiver, in accordance with the subject matter of the present invention.

[0020] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0021] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

[0022] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0023] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

[0024] It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

[0025] By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.

[0026] Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

[0027] It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

[0028] In one implementation, the components that may be used in the system for power-system automation comprises:

P01 Intelligent electronic devices (IED) having IEC-61850 stack in application layer
P02 N number of IED in one network
P03 Connection of IEDs in a single local area network
P04 Ethernet switch
P05 Physical media to exchange data between Ethernet switch and a transmitter
P06 WiMAX transmitter
P21 One network
P07 Receiver Unit
P08 Ethernet switch at receiver end
P22 Another network

[0029] Referring now to figure 1, in one implementation, IED 1 is the intelligent electric device having IEC-61850 stack in the application layer manufacturing message specification (MMS). It may be any relay or device which supports IEC61850. In One network N numbers IED’s can be connected having different applications. The different N numbers of IED may be connected in a single LAN network using Ethernet which forms a local network. Ethernet switch may beused to connect different IED’s to form a local LAN Network. Ethernet cablesmay beused as physical media to exchange data between Ethernet switch and WiMAX device. WiMAX may beused to transmit data with high Speed and range up to 100 km. WiMAX subscriber (Receiver) unit may beplaced within 100 km from WiMAX Transmitter.Ethernet switch may pass the data to particular node depending on the MAC Address and IED Number. This may beone small LAN network which contains different relays or devices which have IEC61850 enabled. All this devices may beconnected to one common Ethernet switch (Hub) and the hub is connected to One WiMAX Device. This may bealso one network similar to that of(P21).

[0030] Referring now to figure 2, in one implementation, a procedure of transmitter of message is disclosed. The procedure may include the below mentioned steps:
P09- IEC61850 application have substation configuration description (SCD) file in which all logical node are mapped and accordingly map all nodes addresses in data map.cfg file;
P10- Place SCD files in IEC61850 code stacked in application layer of IED for execution;
P11- Execute IEC61850 application codes with mapped SCD and data map file;
P12- Set or load comp logic in central processing unit (CPU) card;
P13-Set comp logic for which IED goose messages have to be generated;
P14- Set command to generate goose application to a WiMAX device (P06) to encode the message and further transmit to the receiver end.

[0031] Referring now to figure 3, in one implementation, a procedure of receiver of message is disclosed. The procedure may include the below mentioned steps:
P15- WiMAX subscriber unit act acting as a receiver unit receives GOOSE messages transmitted by a WiMAX transmitter over WiMAX technology;
P16- the WiMAX receiver unit will decidethat received message;
P17-the Ethernet switch at the receiver end validates the IP address of IED and it will pass it to that IED if that IDE is in its Local Network;
P18- the Received message is mapped by IEC61850 Application layer as per the SCD file and datamap.cfg file;
P19- As per the received data, IEC61850 will copy the data in particular address as per the Memory Map.
P20- the Relay or Device will do the necessary Operation as per new data received.

[0032] In one implementation, the present invention provides two different file one is ICD and second is SCD. The ICD file is for SCADA Device configuration and the SCD file is for the relay devices. Based on these file the overall systems performs their operation.

[0033] In one implementation, the GOOSE message of the present invention comprises content information to conveying time critical information between the protection and control devices. For example, in a switched SAS network architecture the switches are provided with a strict priority queuing discipline to provide higher priority for the real-time messages. However, the message scheduling inside the intelligent electronic devices is first in first out (FIFO). The non-critical messages can add to the queuing delay of GOOSE messages during a heavy traffic congestion period.

[0034] Some of the important features of the present invention, considered to be noteworthy are mentioned below:
1. The GOOSE service in IEC 61850 and IEEE 802.16e (WiMAX) is an extremely efficient / high-speed and long distance communicating and fault information that has resulted in a high speed distributed intelligence system.
2. This system effectively extends the substation LAN into the distribution network and enables fast detection, isolation and recovery from faults on the instrumented feeders.
3. The use of WiMAX technology in the present invention provides high bandwidth with quality of service (QoS) over large area.
,CLAIMS:1. A system for communication in power distribution networks, comprising:
a plurality of protective relay devices, at least one transmitter device and at least one receiver device, in a power distribution network, each protective relay device comprising a processor and associated with switching devices for fault detection, fault isolation and service restoration; and CHARACTERIZED IN THAT COMPRISING:
the transmitter device configured to encode at least one message and transmit the message encoded to the receiver device; and
the receiver device configured to receive the message encoded, decode the message and perform at least one operation according to the message received.

2. Thesystem as claimed in claim 1, wherein the transmitter device comprises a substation configuration description (SCD) file storing all information of at least one logical node mapping.

3. Thesystem as claimed in claim 1, wherein the transmitter device is further configured to operate based on the mapping of the SCD and at least one data map file.

4. Thesystem as claimed in claim 1, wherein the transmitter device is further configured to generate the message, specifically a GOOSE message.

5. Thesystem as claimed in claim 1, wherein the transmitter device and the receiver device are WiMAX enabled IEC 61850 devices.

6. Thesystem as claimed in claim 1, wherein the receiver device is configured to receive the message encoded over a WiMAX technology.

7. Thesystem as claimed in claim 1, wherein the receiver device is further configured to decode the message received.

8. The system as claimed in claim 1, comprises a means to validate an IP address of the transmitter device and the receiver device.

9. The system as claimed in claim 1,wherein the receiver device receive the message mapped according to the SCD and the data map file.

10. The system as claimed in claim 1 is characterized by an IEC61850 GOOSE message exchange between substations i.e., transmitter device(s) and receiver device(s) using a WiMAX Technology.