The present disclosure relates to the field of harmonics filters. More
particularly, the present disclosure relates to a multi-core digital signal processor (DSP) based modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads, along with mitigating load unbalance, and meeting power factor requirements, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
BACKGROUND
[0002] Extensive use of non-linear loads, such as thyristors or diode Bridge
rectifiers, switching power supplies, adjustable speed drive, and the likes, have led to harmonic current injection in huge quantities. These harmonics further lead to voltage distortion, which is a dreaded problem for transmission/distribution systems as it results in additional losses in grid line equipment and causes further power quality issues from voltage sag and swells to malfunction/damage of sensitive electronic equipment. Harmonic restriction standards, such as IEEE519, have hence been recommended to limit the harmonic currents injected into the grid. IEEE 519 necessitates utilities to meet voltage distortion and current harmonic limits at the utility-customer point of common coupling (PCC).
[0003] Passive filters like LC, LCL have been used in order to mitigate the
harmonics due to their less complexity and cost factors but these passive filters
again depend on source impedance and may lead to resonance in the network. These
components again need additional space and maintenance. All these factors and
advancements in power electronics led to the development of active harmonic filter
(AHF), which in addition to harmonic mitigation could also provide load balancing
and power factor compensation dynamically. Thus, AHF acts as a power
conditioner on its own depending on the setting be made by the user.
[0004] Due to the multiple advantages, the research work has been
extensively done in the field of AHF to overcome drawbacks and limitations associated with harmonics and passive filters. For example, patent document

CN104104084A titled "Dual-core processor based active power filter controller" discloses a dual-core processor based active power filter controller, which is formed of data acquisition module, DSP+ARM based dual-core, an optical fiber driving module, a human-computer interface and an I/O (Input/Output) interface circuit. DSP (Digital Signal Processor) core and an ARM (Advanced RISC Machines) core. The DSP core is used for supporting high-intensity real-time processing calculation; the ARM is used for being responsible for protection and communication with Man-machine interface and I/O interface circuits. The dual-core processor-based active power filter has can compute complex harmonic detections along with real-time control and communication.
[0005] Another patent document CN108879961A titled "Remote
monitoring method, apparatus and system for active power filter" deals with a remote monitoring method and corresponding setup for an active power filter handling harmonic elimination. The disclosed patent sends control instructions to the AHF setup and monitors the process using a touch screen provided. According to the remote monitoring method, the state of the current power grid can be known along with the control of the filter according to actual conditions. Remote monitoring and operation convenience is provided for the active filter by RS485 interface with electric energy quality monitoring terminal.
[0006] Another patent document CN110912268A titled "Active filter
information processing method based on Internet-of-Things information platform"
discloses an active filter information processing method based on an internet-of-
things information platform, which comprises the steps of collecting and
transmitting operation and fault information of an active power filter using STM32
device through a CAN bus and transmitting the data for user understanding to IoT
platform. The fault data includes PWM input data to time stamps at the fault point.
The disclosed patent deals more with the fault data analysis part for the Active filter
[0007] Another patent document IN 202041004633A titled "Shunt Active
Power Filter For Harmonic Mitigation and Online Measurement Using Smart Meter" discloses shunt active filters for transients and distortion elimination along with compensation for fundamental reactive power in the grid. The disclosed patent

includes a smart meter along with a filter setup to calculate and store power consumption and performance details in databases along with user details which is end to end encrypted, and the user can access this information through the given key.
[0008] With the above-disclosed patent documents, it can be seen that the
existing AHF inventions concentrate on a maximum of one or two of the features. This is because the process involves a huge requirement of processing speed and space, and hence the accommodating all these essential features with the least compromises are still being experimented. Harmonic spectrum analysis and how the system in total benefits the customer is also the need of the hour in this digital world. Moreover, scalability and ease of servicing is key feature for any converter system.
[0009] This has led to a requirement for modular structures, in which
multiple modules can be stacked together as per the capacity needed. To achieve this, all these functions may have adopted the scheme of DSP+FPGA or two separate DSPs, wherein there is hardware separation in main control card as seen, and hence the processing speed is compromised. Besides, additional components may also affect the reliability and performance of the active filter as a whole. Therefore, the existing dual core-based techniques haven't tapped into all the requirements mentioned.
[00010] Therefore, there is a need in the art to obviate the problems
associated with non-linear load systems and existing filters and provide a simple, cost-effective, and efficient multi-core processor-based modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads, mitigating load unbalance, and meeting power factor requirements, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
OBJECTS OF THE PRESENT DISCLOSURE
[00011] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies are as listed herein below.

[00012] It is an object of the present disclosure to overcome the drawbacks,
shortcomings of existing filters, and problems associated with non-linear loads causing harmonics.
[00013] It is an object of the present disclosure to reduce harmonics injection
into the grid caused due to the inclusion of nonlinear loads.
[00014] It is an object of the present disclosure to mitigate load unbalance
due to the inclusion of single-phase loads into systems creating unbalances.
[00015] It is an object of the present disclosure to provide a simple, cost-
effective, and efficient multi-core processor-based modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads along with mitigating load unbalance, and meeting power factor requirements.
[00016] It is an object of the present disclosure to provide a modular setup
of SAHFs that can be easily paralleled to ensure the grid's essential standard requirements.
[00017] It is an object of the present disclosure to provide a system that
reduces harmonics injection into the grid, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
SUMMARY
[00018] The present disclosure relates to a multi-core processor-based
modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads along with mitigating load unbalance, and meeting power factor requirements, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
[00019] According to an aspect of the present disclosure, the present
disclosure pertains to a multi-core processor-based modular shunt active harmonic filters (SAHF) system with CAN and ETHERNET connectivity. The filter system may comprise a master control card comprising a multi-core processor and a set of sensors. The master control card may be electrically configured between a power

source and a load. A set of shunt active harmonics filters (SAHFs) may be operatively coupled to the multi-core processor and may be configured in parallel to the load. The master control card may be configured to monitor a first set of attributes associated with electrical power generated by the power source and correspondingly generate a first set of signals to operate at least one of the SAHFs. Further, based on a predefined set of attributes associated due to more electrical power requirement at the source, and the first set of attributes associated with electrical power generated by the power source, the master control card may enable the multi-core processor to operate the remaining SAHFs by generating a next set of signals having a set of attributes, and inject the generated set of signals into the electrical power generated by the power source to mitigate harmonics present in the corresponding electrical power, and correspondingly generate and supply the electrical power having the predefined set of attributes to the load, which may result in mitigation of harmonics, reduction of total harmonics distortion (THD), mitigation of load unbalancing, and meeting a predefined power factor requirement at the source.
[00020] In an aspect, the master control card may be in communication with
local device comprising of a human-machine interface (HMI) associated with the
setup, through a controller area network (CAN) communication protocol.
[00021] In an aspect, the filter system may comprise an ETHERNET
configured between the master control card and the mobile computing device or the desired servers for IOT based applications, which may enable the communication between the master control card, the SAHFs, and the IoT applications or mobile computing device.
[00022] In an aspect, the mobile computing device and the HMI may be
configured to receive and process any or a combination of the first set of signals, the predefined set of attributes associated with electrical power required at the load, and the second set of signals, to correspondingly display, on the device configured, a waveform, spectrum analysis, and corresponding attributes associated with any or a combination of the electrical power generated by the power source, the second set

of signals being generated by the SAHFs, and the electrical power having the predefined set of attributes being supplied to the load.
[00023] In an aspect, the HMI may be configured to allow the user to enter
the predefined set of attributes associated with the electrical power required at the load, which may correspondingly enable the SAIFFs to generate the second set of signals required to mitigate harmonics in the electrical power required by the load. Further, the HMI may be configured to allow the user to select the second set of signals having the second set of attributes from a set of signals to be injected in the electrical power generated by the power source to mitigate the harmonics, where the set of signals to be selected may be stored as data packets in a database associated with the master control card.
[00024] In an aspect, the filter may comprise a set of power stacks, each
comprising a set of power electronic devices associated with one of the SAHFs, a DC link capacitor, and a line inductor.
[00025] In an aspect, based on the predefined set of attributes associated with
electrical power required at the load and the set of signals being selected by the user using the HMI, the multi-core processor of the master control card may be configured to generate and transmit a set of pulse width modulation (PWM) signals to the set of power electronic devices of the SAHFs to enable switching of the corresponding power electronic devices, which correspondingly enables the SAHFs to generate the set of signals.
[00026] In an aspect, the SAHFs may be configured in the set of power stacks
in a master-slave configuration. The status of the corresponding SAHFs and the set of power stacks may be updated at the master control card, and the HMI, through the CAN communication protocol.
[00027] In an aspect, the set of sensors may be selected from any or a
combination of a current sensor, voltage sensors which act as phase angle sensors, harmonics sensors, and power sensor, which may be configured at predefined positions selected from a group comprising with the power source, the load, and each of the SAHFs.

[00028] In an aspect, the first set of attributes, the second set of attributes,
and the predefined set of attributes may comprise any or a combination of voltage, current, active power, reactive power, power factor, phase angle, phase difference, and THD.
[00029] Various objects, features, aspects and advantages of the present
disclosure will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like features.
[00030] Within the scope of this application it is expressly envisaged that the
various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.
BRIEF DESCRIPTION OF DRAWINGS
[00031] The accompanying drawings are included to provide a further
understanding of the present disclosure, and are incorporated in and constitute a
part of this specification. The drawings illustrate exemplary embodiments of the
present disclosure and, together with the description, serve to explain the principles
of the present disclosure. The diagrams are for illustration only, which thus is not a
limitation of the present disclosure.
[00032] FIG. 1 illustrates an exemplary view depicting the connection of the
proposed modular SAHF system with an electrical power system, in accordance
with an embodiment of the present disclosure.
[00033] FIG. 2 illustrates an exemplary flow chart depicting the operation of
the proposed modular SAHF system, in accordance with an embodiment of the
present disclosure.
[00034] FIG. 3 illustrates an exemplary controller diagram of the proposed
modular SAHF system, in accordance with an embodiment of the present
disclosure.

DETAILED DESCRIPTION
[00035] The following is a detailed description of embodiments of the
disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[00036] The present disclosure relates to the field of harmonics filters. More
particularly, the present disclosure relates to a multi-core processor-based modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads, along with mitigating load unbalance, and meeting power factor requirements, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
[00037] According to an aspect, the present disclosure elaborates upon a
multi-core processor-based modular Shunt Active Harmonic Filters (SAHF) system, which can be used in industries to reduce the unwanted harmonic injection to the grid caused due to inclusion of nonlinear loads in the system. In addition to harmonic elimination, the proposed system can also help in mitigating unbalance and meeting power factor requirements. The modular setup of the system comprising multiple SAHF's can be paralleled to meet the grid's essential standard requirements. The process validation of parallel SAHF's can be confirmed with the help of a CAN communication network created between the modules, which passes on essential information to ensure setup is working at its required capability. Additionally, the essential data can be transmitted over ETHERNET and viewed as per need.
[00038] Multiple modules of SAHF's can be connected in a master-slave
configuration to keep operating in synchronism with other modules. This feature can be a key addition in the proposed system where the modules keep updating about their current state at regular intervals through a high-speed CAN-based

communication network in addition to the remote monitoring which can be achieved through ETHERNET. The multi-core processor can efficiently split the control and FFT analysis of the load/source currents and other communication needs without the need for additional processing or communication-based processors to achieve all these features.
[00039] Referring to FIGs 1 and 3, the proposed SAHF system 100 (also
referred to as a system 100, herein) can include a master control card 302 including
a multi-core processor 304 and a set of sensors 102-1, 108, being electrically
configured between a power source 104 (also referred to as grid, herein) and a load
106. Further, a set of shunt active harmonics filters (SAHFs) 102-A, 102-B (also
referred to as active harmonics filter (AHF) 102, herein), which can be configured
in parallel to the load 106 can be operatively coupled to the multi-core processor
304 a part of the main control board 302. The master control card 302 can be in
communication with a human-machine interface (HMI) 308 associated with a local
device, through a controller area network (CAN) communication protocol.
[00040] In an embodiment, the SAHF's 102 can include an ETHERNET 306
configured between the master control card 302 and the mobile computing device
or IoT based dedicated applications, which can enable the remote communication
between the master control card 302, the SAHFs 102 with the user.
[00041] In an embodiment, the set of sensors 102-1, 108 can be selected from
any or a combination of the current sensors, voltage sensors which act as phase
angle sensors, harmonics sensors, and power sensors, but not limited to the likes.
The first set of sensors 108 can be configured at the power source 104, and the
second set of sensors 102-1 can be configured with each of the SAHFs 102. Further,
the third set of sensors (not shown) can be configured at the load 106.
[00042] The master control card 302 can be configured to monitor a first set
of attributes associated with electrical power generated by the power source 104 at the grid, and can correspondingly generate a first set of signals. Further, based on a predefined set of attributes associated with electrical power required at the load 106, and the first set of attributes associated with electrical power generated by the power source 104, the master control card 302 can enable the multi-core processor 304 to

operate at least one of the SAHFs 102 to generate a second set of signals having a second set of attributes. The generated second set of signals can be fed into the electrical power generated by the power source 104 to mitigate harmonics present in the corresponding electrical power having the predefined set of attributes (or harmonics free electrical power), which can generate and supply the electrical power to the load 106, which results in mitigation of harmonics, reduction of total harmonics distortion (THD), mitigation of load unbalancing, and meeting a power factor requirement at the source 104.
[00043] In an exemplary embodiment, the first set of attributes, the second
set of attributes, and the predefined set of attributes can include any or a
combination of voltage, current, active power, reactive power, power factor, phase
angle, phase difference, and THD, but not limited to the likes.
[00044] In an embodiment, the HMI308 can receive the sensed data and the
electrical power required at the load 106, as well as the second set of signals generated by the master control card 302. The HMI 308 can correspondingly process these data and display a waveform, spectrum analysis, and corresponding attributes associated with the electrical power generated by the power source 104, the second set of signals being generated by the SAHF's 102, and the electrical power having the predefined set of attributes being supplied to or required at the load 106.
[00045] The HMI 308 can allow the user to enter the predefined set of
attributes associated with the electrical power required at the load 106. Based on the rating/attributes of power required at the load 106, the master control card 302 can enable the SAHFs 102 to generate the second set of signals required to mitigate harmonics in the electrical power required by the load 106. Further, in an embodiment, the HMI 308 can allow the user to select any one or more signals among multiple pre-stored signals, required to mitigate harmonics of the power source 104 (i.e. the second set of signals having the second set of attributes from a set of signals). The set of signals to be selected for harmonics mitigation can be pre-stored as data packets in a database associated with the master control card 302. The user can add or modify the pre-stored signals, which can be further injected

into the electrical power for supplying to the load 106, thereby eliminating
harmonics injection into the grid caused due to inclusion of nonlinear load 106s and
an additional set of signals can be added based on requirements for mitigating load
unbalance, and meeting power factor requirements at the load 106.
[00046] Referring to FIG. 3, as shown SAHFs 102 in system 100 can also be
considered as modular device 300, which can include multiple stacks including power stacks 310-1 to 310-3 (collectively referred to as power stacks 310, herein), and modular cards as modules 312-1 to 312-3 (collectively referred to as modules or modular cards 312, herein). The main control card 302 accommodating the multi-core processor 304 can control all operations of the proposed system from sensing of the essential voltage and current signals explained above to the generation of PWM for the operation of AHF 102 by switching semiconductor devices using a communication link between the modules 312 and can correspondingly communicate to the external world. The master control card 302 can deal with all three features of the AHF 102 by communicating with all the modular cards through CAN communication. The multicore processor 304 can include a dedicated or main core for control operation whereas the second core can deal with FFT analysis, and passing on these data to the first core for controlling the system 100 on the basis of these analyses, while another arm-based core can carry out the needed local and remote communication on basis of inputs received from the main core. Thus, the master control card 302 can control turn on and turn off of the working of the SAHF's 102. Based on the system and load 106 rating/attributes, the main control card 302 can also provide a fault-tolerant structure by letting the operational modules continue to work while the module in fault can be taken out for repairing or maintenance.
[00047] The communication network including the data transfer to the local
HMI 308 and other remote mobile computing devices can all be controlled by the master control card 302. The HMI 308 can display the current states, the spectrum analysis of sensed currents, and the fault logs with time stamps for the user's perusal. The master control card 302 can send data to the HMI 308, where the user can see all the above information. Further, for selective harmonic elimination, the

users can select the harmonic order for mitigation through the HMI 308. The communication between the master control card 302 and the HMI 308 can be done through the high-speed CAN protocol, which can send data at high-speed connectivity up to 1 MB/Sec so that the user can see the live data information of the system. Further, ETHERNET 306 can provide the remote data monitoring feature to the proposed system 100, which can be utilized to send these data to the desired servers for IOT based applications of monitoring the system 100 from remote locations.
[00048] In an embodiment, each power stack 310 can include the set of
power electronic devices associated with one of the SAHFs 102. The power stacks
310 can further include a DC link capacitor and a line inductor. The SAHFs 102
inclusive of power stacks 310 can be configured in a master-slave configuration.
The status of the corresponding SAHFs 102 and the power stacks 310 within can
be updated at the master control card 302 via data obtained from modular cards 312,
and the HMI 308, through the respective CAN communication. The power
electronic devices and DC link capacitor along with all the sensors 108, 102-1 can
work as a Voltage source Inverter (VSI), which can be designed for meeting
grid/power source 104 standards. The power stack 310 can be connected through a
line inductor 102-2 to a utility-customer PCC. Initially, the DC-link capacitor can
be connected with a pre-charging circuit for soft charge and once it gets charged to
a peak of the AC line voltage, the pre-charging circuit can be disconnected, and the
power stack 310 can be connected directly through the inductor.
[00049] The modular card 312 can facilitate paralleling of the stacks 310 and
distribution of PWM pulse into power electronic devices from the master control card 302 and the modular card 312. The modular card 312 can also provide looping for PWM and error pulses from the master control card 302 to the modular card 312, such that at time of fault occurrence in one path, PWM pulses can continue flowing from other paths of the master control card 302 to the remaining modular cards 312. The modular cards 312 can include an affordable high-speed microcontroller that can enable communication with master control card 302. The modular cards 312 can also store all the data about their respective stack and can

send it to the master control card 302, such as status of the stacks, fault occurrence, filter current of that particular stack, and temperature of the semiconductor device, and the likes. Based on these data, the multi-core processor 304 can decide the next course of action needed for the successful stable operation of the entire SAHFsysteml02. WORKING
[00050] The Shunt Active Harmonic Filters (SAHF) 102 used in the
proposed system 100 provides better current harmonic compensation as they provide faster responses to the load variations and are hence widely used in industries. In terms of the nomenclature, the SAHFs 102 can be coupled in parallel/shunt to the power supply 104 and the load 106 at the PCC. The SAHFs 102 provide the nonlinear components of electrical power (currents) to the load 106, thereby reducing the total harmonic distortion (THD) in the grid currents which is a parametric indication of the total amount of harmonics existing in the signal considered. SAHFs 102 detect the entire harmonic spectrum of the current to be compensated and inject the current, which is ideally the harmonic current but in opposite direction. Accordingly, both the currents cancel out leaving the fundamental quantity to be supplied by the power system, thus, improving the THD value.
[00051] In the proposed SAHF's 102, referring to the flowchart of FIG. 2,
the process involves the DC capacitor being charged through the pre-charging circuit to the maximum voltage of peak of line voltage. It is then continued with source-side voltage sensing (V(a,b,c)). These are essential for estimating the grid angle and synchronizing the control with the grid, as the Synchronous DQ frame technique is employed in the application to achieve desired dynamic control. This can be achieved with help of a Phase Locked Loop (PLL) strategy which can help in achieving accurate estimation of grid angle. In addition to the voltage measurements, three-phase current sensors 108 and 102-1 can be utilized in the strategy which can include the source side current (Is(a,b,c)) measurement and the filter current (If(a,b,c)) measurement. The source-side sensor 108 can sense the harmonic spectrum of the current and can give statistics about the amount of

harmonic content of each order of harmonic extant while the filter side sensor can help in sensing the harmonic content generated by the filter 102 as well as for control purposes.
[00052] The control process involved in the proposed system 100 is a multi-
loop control strategy with outer voltage and inner current controllers for achieving the desired performance. Once the Phase Locked Loop gives an indication that synchronism is achieved, the control process begins with increasing DC link voltage to a set value that is higher than the peak value of grid voltage. This forms the outer loop of the control structure and keeps maintaining the reference DC-link value which in turn acts as an input to the inner current loops which regulate the currents and entire power flow through the designed filter system 100. Once the DC is stabilized the master control card 302 processed source side currents can be viewed on the HMI 308 provided. The main principle of the SAHF 102 can be to extract the harmonic information of the source current, which acts as the harmonic reference quantity of the inner current controller. Thus, the HMI 308 can help the user to be in charge by displaying the FFT graphs for the sensed currents and helps the operator to select and initiate the elimination process while monitoring the system performance. The selection of a maximum of 20 harmonics at a time can be available on the HMI screen 308 and selected harmonics can be increased within limit specified, as more the selection option, the better the waveform of currents on the source side can be. These selected harmonics can act as a reference to the inner loop and as discussed can be selected as per the user's requirement by feeding in the harmonics to be eliminated from the HMI screen.
[00053] Internally in the master control card 302, the selected harmonics can
be transformed to the relevant Harmonic dq frame, which works on the principle of transposing the total harmonic current into dq frame rotating at the angular speed of desired harmonic frequency, where the angular speed is derived from PLL's estimated angle from earlier processing. This can help in the control process as in the harmonic dq frame, the selected harmonic becomes a dc signal and all other frequencies change into orders of ±6n. Having the desired frequency transformed into DC signals can facilitate its isolation from the entire spectrum with a simple

first-order digital Low Pass Filter (LPF). Phase compensation can also be achieved in this process by adding the phase angle at the inverse dq-abc transformation into a stationary frame. The selected harmonic orders can thus be processed and transformed as per need and summation of these signals acts as the final harmonic reference to the internal current controller. The inner current loop controllers can be designed such that it can have high bandwidth and zero phase shift features. The current controller can compensate also for the possible non-linearity of the plant and eliminate external disturbances induced in the inner current loop. These processes in turn impact the PWM generated for the converter and thus help in achieving control.
[00054] Apart from nonlinear loads, the loads which form a majority can be
inductive loads that demand reactive power for their operation and hence diminish
the power factor of the supply. Additionally, due to the distribution aspect, all the
phases of the supply are not uniformly loaded and these lead to produce unbalanced
currents in the lines. These too can be mitigated with the help of the proposed
system 100, thus, helping in achieving overall improved grid quality. For achieving
balancing in the proposed system, the measured source currents are processed
similarly to the harmonic quantities and are transformed with respect to
fundamental angular speed instead of multiples of fundamental as in the case of
harmonics, but in the reverse direction. Whereas, the required reactive power of the
load 106 is estimated from the source current characteristics in the processor and
are yet again used as a reference for current controllers to inject desired reactive
power into the line thus helping to maintain the optimal power factor.
[00055] With the integration of the above two features namely the reactive
power compensation and balancing of currents into the filter system 102, it can serve the purpose of improving the power factor and maintaining balance across the lines. These can also help in monetary gains as industries are charged on basis of reactive power consumption while helping to maintain a clean and stable grid. All the three features, namely the selective harmonic mitigation, reactive power compensation, and unbalanced current compensation explained above can be

independently selectable through the HMI 308 screen provided as per the user's need.
[00056] Those skilled in the art would appreciate that the embodiments of
the present disclosure utilize various novel and inventive features by providing a simple, cost-effective, efficient, and modular multi-core processor-based modular shunt active harmonic filters (SAHF) system that reduces harmonics injection into the grid caused due to inclusion of nonlinear loads, along with capability of mitigating load unbalance, and meeting power factor requirements, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.
[00057] While some embodiments of the present disclosure have been
illustrated and described, those are completely exemplary in nature. The disclosure is not limited to the embodiments as elaborated herein only and it would be apparent to those skilled in the art that numerous modifications besides those already described are possible without departing from the inventive concepts herein. All such modifications, changes, variations, substitutions, and equivalents are completely within the scope of the present disclosure. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims.
ADVANTAGES OF THE PRESENT INVENTION
[00058] The present invention overcomes the drawbacks, shortcomings, and
problems associated with non-linear loads, harmonics, and existing filters.
[00059] The present invention reduces harmonics injection into the grid
caused due to the inclusion of nonlinear loads.
[00060] The present invention mitigates load unbalances due to the inclusion
of unbalanced loads.
[00061] The present invention provides a simple, cost-effective, and efficient
multi-core processor-based modular shunt active harmonic filters (SAHF) system
that reduces harmonics injection into the grid caused due to inclusion of nonlinear
loads, mitigating load unbalance, and meeting power factor requirements.

[00062] The present invention provides a modular setup of SAHF s that can
be easily paralleled as per current requirements to ensure the grid's essential standard requirements.
[00063] The present invention provides a system that reduces harmonics
injection into the grid, and which can be operated and monitored remotely and securely using CAN communication protocol and ETHERNET.

WE CLAIM:

A multi-core DSP based modular shunt active harmonics filter system (102) with CAN and ETHERNET connectivity, the filter system (102) comprising:
a master control card (302) comprising a multi-core processor (304) and a set of sensors (108, 102-1), the master control card (302) electrically configured between a power source (104) and a load (106); and
a set of shunt active harmonics filters (SAHFs) (102-A, 102-B) operatively coupled to the multi-core processor and configured in parallel to the load (106);
wherein the master control card (302) is configured to:
monitor a first set of attributes associated with electrical power generated by the power source (104) and correspondingly generate a first set of signals;
based on a predefined set of attributes associated with electrical power required at the load (106), and the first set of attributes associated with electrical power generated by the power source (104), enable the multi-core processor to operate at least one of the SAHFs (102-A, 102-B) to generate a second set of signals having a second set of attributes; and
inject the generated second set of signals into the electrical power generated by the power source (104) to mitigate harmonics present in the corresponding electrical power; and correspondingly generate and supply the electrical power having the predefined set of attributes to the load (106), which results in mitigation of harmonics, reduction of total harmonics distortion (THD), mitigation of load unbalancing, and meeting a predefined power factor requirement at the source (104). The filter system (102) as claimed in claim 1, wherein the master control card (302) is in communication with a human-machine interface (HMI)

(308) associated with the system, through a controller area network (CAN) communication protocol.
The filter system (102) as claimed in claim 2, wherein the filter system (102) comprises an ETHERNET (306) configured between the master control card (302) and a mobile computing device or one or more servers for IOT based applications of the user, which enables the remote communication between the SAHFs (102) and the mobile computing device. The filter system (102) as claimed in claim 2, wherein the HMI is configured to receive and process any or a combination of the first set of signals, the predefined set of attributes associated with electrical power required at the load (106), and the second set of signals, to correspondingly display, on the HMI (308), a waveform, spectrum analysis, and corresponding attributes associated with any or a combination of the electrical power generated by the power source (104), the second set of signals being generated by the SAHFs, and the electrical power having the predefined set of attributes being supplied to the load (106).
The filter system (102) as claimed in claim 2, wherein the HMI (308) is configured to:
allow the user to enter the predefined set of attributes associated with the electrical power required at the load (106), which correspondingly enables the SAHFs (102-A, 102-B) to generate the second set of signals required to mitigate harmonics in the electrical power required by the load (106); and/or
allow the user to select the second set of signals having the second set of attributes from a set of signals to be injected in the electrical power generated by the power source (104) to mitigate the harmonics, wherein the set of signals to be selected are stored as data packets in a database associated with the master control card (302).
The filter system (102) as claimed in claim 5, wherein the filter system (102) comprises a set of power stacks (310), each comprising a set of power

electronic devices (102-3) associated with one of the SAHFs (102-A, 102-B), a DC link capacitor, and a line inductor.
7. The filter system (102) as claimed in claim 6, wherein based on the predefined set of attributes associated with electrical power required at the load (106) or the second set of signals being selected by the user using the HMI (308), the multi-core processor (304) of the master control card (302) is configured to generate and transmit a set of pulse width modulation (PWM) signals to the set of power electronic devices (102-3) of the SAHFs (102-A, 102-B) to enable switching of the corresponding power electronic devices (102-3), which correspondingly enables the SAHFs (102-A, 102-B) to generate the second set of signals.
8. The filter system (102) as claimed in claim 6, wherein the SAHFs (102-A, 102-B) are configured in the set of power stacks in a master-slave configuration, wherein the status of the corresponding SAHFs (102-A, 102-B) and the set of power stacks (312) are updated at the master control card (302), and the HMI (308), through the CAN communication protocol.
9. The filter system (102) as claimed in claim 1, wherein the set of sensors (108, 102-1) is selected from any or a combination of current sensor, voltage sensors which act as phase angle sensors, harmonics sensors, and power sensor, wherein the set of sensors (108, 102-1) is configured at predefined positions selected from a group comprising with the power source (104), the load (106), and each of the SAHFs (102-A, 102-B).
10. The filter system (102) as claimed in claim 1, wherein the first set of attributes, the second set of attributes, and the predefined set of attributes comprise any or a combination of voltage, current, active power, reactive power, power factor, phase angle, phase difference, and THE).