Gnana Swathika O V - Academia.edu (original) (raw)

Papers by Gnana Swathika O V

2017 International Conference on Power and Embedded Drive Control (ICPEDC)

Microgrids are a collections of loads, small sources and storage systems which are present as sin... more Microgrids are a collections of loads, small sources and storage systems which are present as single, flexible and independently controllable entities [1]. The inclusion of Distributed Generation (DGs) systems into a microgrid makes the current flow in a microgid bidirectional. The detection of faults and the connection and disconnection of the DGs to and from the microgrid is carried out by the Central Protection Centre (CPC). In this paper we aim to develop an automated CPC based on the concept of Internet of Things (IoT) which would constantly monitor the grid for the detection of faults and rectify them. The rectification of fault is either done by isolating the faulted bus or finding the shortest path from the faulted bus to the main grid.

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Suitable protection system is a must to protect people and primary electric power equipment from ... more Suitable protection system is a must to protect people and primary electric power equipment from disaster or damage. Most frequent faults that occur in the distribution system are overcurrent faults. Overcurrent (OC) relays are used significantly in protecting power distribution system from frequently caused faults like short circuits, ground faults, etc. Optimization algorithms maybe used to minimize the time of operation of relays. This paper implements Big M and Revised Simplex method for optimum time coordination of overcurrent relays in a distribution network and identifies the optimized time multiplier setting (TMS) of the relay. This helps in quick coordination of overcurrent relays and also fast fault clearance.

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Power Systems are prone to damage due to overcurrent as a result of faults like ground faults, li... more Power Systems are prone to damage due to overcurrent as a result of faults like ground faults, line faults, short circuit etc. In order to curb the damage caused by these faults suitable protects systems must be placed. The protection system usually consists of a primary system and a backup system with proper coordination between the two systems (i.e. their tripping time) in order to ensure proper clearance of faults in minimum time. In this paper, the optimization of overcurrent relays which are primarily used as backup systems against these faults are analyzed. The application of swarm intelligence algorithms: Ant Colony Optimization and Firefly Algorithm in radial system are done in order to obtain the time multiplier settings of the relays. This enables us to achieve proper coordination between the overcurrent relays in the network.

2017 2nd International Conference on Communication and Electronics Systems (ICCES), 2017

Electrical power grids are the backbone of all electricity distribution in the modern world. Faul... more Electrical power grids are the backbone of all electricity distribution in the modern world. Faults in the microgrid may lead to blackouts or equipment damage. It stands to reason that we design our microgrids in such a way that a fault in a part of a network is isolated and does not propagate to the entire network causing a full blackout. Industry requirements specify that any fault leading from physical damage to the line, insulator flashovers, or even human error, be isolated within the affected section within instants of occurrence. This is because effects resulting from power line faults, such as overcurrents and voltage dips, are often seriously damaging to industry equipment which is expensive to replace. Hence the grid design should incorporate fault isolation and clearance procedures in order to obtain a reliable and adaptive protection system. Overcurrent relays have been found to be good fault isolators in microgrids. The relay must be protect the MG against faults in grid-connected and islanded modes and sense faults in the main grid in the former with high selectivity, sensitivity and reliability. The time coordination of overcurrent relay in microgrids may be achieved using different optimization algorithms. The algorithms considered in this paper are the Dual-Simplex method and the Karmarkar Algorithm. These algorithms contribute to the identification of the Time-Multiplier Settings of the overcurrent relays used in the microgrid.

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Suitable protection system is a must to protect people and primary electric power equipment from ... more Suitable protection system is a must to protect people and primary electric power equipment from disaster or damage. Most frequent faults that occur in the distribution system are overcurrent faults. Overcurrent (OC) relays are used significantly in protecting power distribution system from frequently caused faults like short circuits, ground faults, etc. Optimization algorithms maybe used to minimize the time of operation of relays. This paper implements Big M and Revised Simplex method for optimum time coordination of overcurrent relays in a distribution network and identifies the optimized time multiplier setting (TMS) of the relay. This helps in quick coordination of overcurrent relays and also fast fault clearance.

Advanced Science Letters, 2017

International journal of pure and applied mathematics, 2016

The microgrid is a distribution level network with interleaved loads and distributed generators (... more The microgrid is a distribution level network with interleaved loads and distributed generators (DG’s). Bidirectional power flow and reconfiguration of microgrid causes variation in fault current magnitude. Due to this, the conventional protection schemes are not sufficient for microgrid protection. Hence the microgrid network demands an adaptive protection scheme, which is a key challenge to protection engineers. The knowledge of the current topology of the microgrid is necessary before a protection strategy is applied on it. This paper proposes a hybrid Kruskal-Johnson’s algorithm, where the current topology of the network at any instant of time is identified using Kruskal algorithm. Once the current topology is known, whenever a fault occurs in the network the Johnson’s algorithm assists in identifying the shortest path from the node closer to the fault to the utility grid (in grid connected mode) or point of common coupling (in islanded mode). The algorithm ensures minimum porti...

2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA), 2018

A microgrid is a localized grouping of electricity sources and loads i.e. it is a small-scale pow... more A microgrid is a localized grouping of electricity sources and loads i.e. it is a small-scale power grid that normally operates connected to the centralized grid but can also disconnect and function autonomously. This papers proposes a LabVIEW based Central Protection Center (CPC) that remotely monitors a grid-connected microgrid using a wireless medium. The microgrid is divided into zones for ease of monitoring. The CPC is capable of continuously capturing the current status of the grid in a zonalised manner. If a fault is diagnosed by the central protection center, then it issues appropriate overcurrent relay coordination to the microgrid network.

Journal of Telecommunication, Electronic and Computer Engineering, 2018

Microgrids are energy systems that consist of distributed energy sources and loads, which can ope... more Microgrids are energy systems that consist of distributed energy sources and loads, which can operate in parallel with or independently from the main grid. The integration of renewable Energy System (RES) into microgrid causes the power flow to be bidirectional in nature. Reconfiguration of the microgrid could occur due to RES, load or utility grid connection or disconnection. Thus, conventional protection strategies are not applicable to microgrids and it is challenging for engineers to tackle any faulty issues. This paper proposes graph algorithms, such as the Kruskals and the Prim which aid in identifying the shortest path from a faulted point to the point of common coupling(PCC). Algorithms, such as Floyd Warshall and Djiktra’s algorithms ensure that only minimum portion of the network is disconnected during fault clearance.

International Journal of Simulation: Systems, Science & Technology, 2016

Microgrids are inevitable at distribution level of power system networks. They are the solution t... more Microgrids are inevitable at distribution level of power system networks. They are the solution to the growing power demand. Reconfiguration occurs in microgrid mainly due to connection and disconnection of the distributed generators (DG) and loads. Reconfiguration in turn causes topology changes and hence conventional protection schemes may not be applicable in microgrid for efficient fault clearance. This paper proposes a Chazelle-Dijkstra method using Fibonacci Heap algorithm which detects the shortest path between the faulty point to the nearest operating source. This ensures that during fault clearance minimum portion of network is disconnected. This algorithm is tested and validated on 118-bus standard microgrid network.

SSRN Electronic Journal, 2019

With increasing energy demand and the necessity to fulfill the energy requirement, it is mandator... more With increasing energy demand and the necessity to fulfill the energy requirement, it is mandatory to increase the energy generation. However, shortage of supply resources stands as a blockade in this present scenario. Hence, an efficient energy management system is required. This paper demonstrates a working prototype of intelligent energy management system. It is an IoT-based energy management system with Web server-type manual control. It involves serial communication between microcontrollers such as Arduino Uno and NodeMCUs, sensors and computational intelligence. The sensors used in this case are LDR, thermistor, and PIR motion sensor. The system includes LED lights and fans as load. The raw data from the sensors is read by the Arduino and it serially communicates the raw data to both the NodeMCUs. The data is then converted to standard formats and uploaded to the ThingSpeak cloud server for data logging and analysis by one of the NodeMCU. Using the second NodeMCU, a Web server is created and used for manual control of the loads. This Wi-Fi server sends data to the NodeMCU as per the user input from the browser and this NodeMCU controls the load accordingly. A current sensor is also connected along the supply line for power measurement. The current sensor is an ACS712 20 A sensor which is connected to the NodeMCU and is responsible for uploading data to the ThingSpeak cloud server. The working model has three rooms for demonstration purpose but can be increased accordingly as per need with certain changes in system hardware model.

This paper describes the battery charging and discharging controller for a battery connected with... more This paper describes the battery charging and discharging controller for a battery connected with the micro grid. Some instruments or devices connected in a micro grid need uninterruptable power supply so we need a backup power supply system for those devices. Backup supply always increases the power quality of a system by giving a continuous service. In islanding mode of operation battery supply the critical load connected with it and in grid connected condition the main supply operates the devices. The battery feeds some loads in the micro grid in case of any grid failure occurs. This paper describes the operation of a battery from charging to discharging operation smoothly without disturbing the other circuit and critical loads connected to it. Total battery operation divided into three parts charging condition discharging condition and idle period. There is always a need of interfacing circuit while connecting a battery in the micro grid. This paper describes the interfacing cir...

International Journal of Smart grid, 2018

Microgrids are the key solution to handle the growing technical, environmental and economical con... more Microgrids are the key solution to handle the growing technical, environmental and economical concerns of existing power system networks. The purpose of this paper is to develop an intelligent and adaptive overcurrent protection system for a microgrid. This system is capable of monitoring, protecting and controlling the microgrid. A look up table is created and maintained at the central protection system of the microgrid, which has details of normal and faulted current in all feeders for various topologies of the microgrid system. It has the optimized values for time dial setting and operating time of relays for faults at a specific location in the reconfigured system, which is generated using Dual Simplex algorithm. Hence the Central Protection System aids in providing suitable overcurrent relay coordination to the microgrid, which may incur reduced network disconnection. The hardware prototype of the Central Protection System is realized, tested and validated on a balanced 21-bus microgrid system.

2022 IEEE 2nd International Symposium on Sustainable Energy, Signal Processing and Cyber Security (iSSSC)

2022 IEEE 2nd International Symposium on Sustainable Energy, Signal Processing and Cyber Security (iSSSC)

2017 International Conference on Power and Embedded Drive Control (ICPEDC)

Microgrids are a collections of loads, small sources and storage systems which are present as sin... more Microgrids are a collections of loads, small sources and storage systems which are present as single, flexible and independently controllable entities [1]. The inclusion of Distributed Generation (DGs) systems into a microgrid makes the current flow in a microgid bidirectional. The detection of faults and the connection and disconnection of the DGs to and from the microgrid is carried out by the Central Protection Centre (CPC). In this paper we aim to develop an automated CPC based on the concept of Internet of Things (IoT) which would constantly monitor the grid for the detection of faults and rectify them. The rectification of fault is either done by isolating the faulted bus or finding the shortest path from the faulted bus to the main grid.

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

Smart Buildings Digitalization, 2021

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Suitable protection system is a must to protect people and primary electric power equipment from ... more Suitable protection system is a must to protect people and primary electric power equipment from disaster or damage. Most frequent faults that occur in the distribution system are overcurrent faults. Overcurrent (OC) relays are used significantly in protecting power distribution system from frequently caused faults like short circuits, ground faults, etc. Optimization algorithms maybe used to minimize the time of operation of relays. This paper implements Big M and Revised Simplex method for optimum time coordination of overcurrent relays in a distribution network and identifies the optimized time multiplier setting (TMS) of the relay. This helps in quick coordination of overcurrent relays and also fast fault clearance.

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Power Systems are prone to damage due to overcurrent as a result of faults like ground faults, li... more Power Systems are prone to damage due to overcurrent as a result of faults like ground faults, line faults, short circuit etc. In order to curb the damage caused by these faults suitable protects systems must be placed. The protection system usually consists of a primary system and a backup system with proper coordination between the two systems (i.e. their tripping time) in order to ensure proper clearance of faults in minimum time. In this paper, the optimization of overcurrent relays which are primarily used as backup systems against these faults are analyzed. The application of swarm intelligence algorithms: Ant Colony Optimization and Firefly Algorithm in radial system are done in order to obtain the time multiplier settings of the relays. This enables us to achieve proper coordination between the overcurrent relays in the network.

2017 2nd International Conference on Communication and Electronics Systems (ICCES), 2017

Electrical power grids are the backbone of all electricity distribution in the modern world. Faul... more Electrical power grids are the backbone of all electricity distribution in the modern world. Faults in the microgrid may lead to blackouts or equipment damage. It stands to reason that we design our microgrids in such a way that a fault in a part of a network is isolated and does not propagate to the entire network causing a full blackout. Industry requirements specify that any fault leading from physical damage to the line, insulator flashovers, or even human error, be isolated within the affected section within instants of occurrence. This is because effects resulting from power line faults, such as overcurrents and voltage dips, are often seriously damaging to industry equipment which is expensive to replace. Hence the grid design should incorporate fault isolation and clearance procedures in order to obtain a reliable and adaptive protection system. Overcurrent relays have been found to be good fault isolators in microgrids. The relay must be protect the MG against faults in grid-connected and islanded modes and sense faults in the main grid in the former with high selectivity, sensitivity and reliability. The time coordination of overcurrent relay in microgrids may be achieved using different optimization algorithms. The algorithms considered in this paper are the Dual-Simplex method and the Karmarkar Algorithm. These algorithms contribute to the identification of the Time-Multiplier Settings of the overcurrent relays used in the microgrid.

2017 International Conference on Computing Methodologies and Communication (ICCMC), 2017

Suitable protection system is a must to protect people and primary electric power equipment from ... more Suitable protection system is a must to protect people and primary electric power equipment from disaster or damage. Most frequent faults that occur in the distribution system are overcurrent faults. Overcurrent (OC) relays are used significantly in protecting power distribution system from frequently caused faults like short circuits, ground faults, etc. Optimization algorithms maybe used to minimize the time of operation of relays. This paper implements Big M and Revised Simplex method for optimum time coordination of overcurrent relays in a distribution network and identifies the optimized time multiplier setting (TMS) of the relay. This helps in quick coordination of overcurrent relays and also fast fault clearance.

Advanced Science Letters, 2017

International journal of pure and applied mathematics, 2016

The microgrid is a distribution level network with interleaved loads and distributed generators (... more The microgrid is a distribution level network with interleaved loads and distributed generators (DG’s). Bidirectional power flow and reconfiguration of microgrid causes variation in fault current magnitude. Due to this, the conventional protection schemes are not sufficient for microgrid protection. Hence the microgrid network demands an adaptive protection scheme, which is a key challenge to protection engineers. The knowledge of the current topology of the microgrid is necessary before a protection strategy is applied on it. This paper proposes a hybrid Kruskal-Johnson’s algorithm, where the current topology of the network at any instant of time is identified using Kruskal algorithm. Once the current topology is known, whenever a fault occurs in the network the Johnson’s algorithm assists in identifying the shortest path from the node closer to the fault to the utility grid (in grid connected mode) or point of common coupling (in islanded mode). The algorithm ensures minimum porti...

2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA), 2018

A microgrid is a localized grouping of electricity sources and loads i.e. it is a small-scale pow... more A microgrid is a localized grouping of electricity sources and loads i.e. it is a small-scale power grid that normally operates connected to the centralized grid but can also disconnect and function autonomously. This papers proposes a LabVIEW based Central Protection Center (CPC) that remotely monitors a grid-connected microgrid using a wireless medium. The microgrid is divided into zones for ease of monitoring. The CPC is capable of continuously capturing the current status of the grid in a zonalised manner. If a fault is diagnosed by the central protection center, then it issues appropriate overcurrent relay coordination to the microgrid network.

Journal of Telecommunication, Electronic and Computer Engineering, 2018

Microgrids are energy systems that consist of distributed energy sources and loads, which can ope... more Microgrids are energy systems that consist of distributed energy sources and loads, which can operate in parallel with or independently from the main grid. The integration of renewable Energy System (RES) into microgrid causes the power flow to be bidirectional in nature. Reconfiguration of the microgrid could occur due to RES, load or utility grid connection or disconnection. Thus, conventional protection strategies are not applicable to microgrids and it is challenging for engineers to tackle any faulty issues. This paper proposes graph algorithms, such as the Kruskals and the Prim which aid in identifying the shortest path from a faulted point to the point of common coupling(PCC). Algorithms, such as Floyd Warshall and Djiktra’s algorithms ensure that only minimum portion of the network is disconnected during fault clearance.

International Journal of Simulation: Systems, Science & Technology, 2016

Microgrids are inevitable at distribution level of power system networks. They are the solution t... more Microgrids are inevitable at distribution level of power system networks. They are the solution to the growing power demand. Reconfiguration occurs in microgrid mainly due to connection and disconnection of the distributed generators (DG) and loads. Reconfiguration in turn causes topology changes and hence conventional protection schemes may not be applicable in microgrid for efficient fault clearance. This paper proposes a Chazelle-Dijkstra method using Fibonacci Heap algorithm which detects the shortest path between the faulty point to the nearest operating source. This ensures that during fault clearance minimum portion of network is disconnected. This algorithm is tested and validated on 118-bus standard microgrid network.

SSRN Electronic Journal, 2019

With increasing energy demand and the necessity to fulfill the energy requirement, it is mandator... more With increasing energy demand and the necessity to fulfill the energy requirement, it is mandatory to increase the energy generation. However, shortage of supply resources stands as a blockade in this present scenario. Hence, an efficient energy management system is required. This paper demonstrates a working prototype of intelligent energy management system. It is an IoT-based energy management system with Web server-type manual control. It involves serial communication between microcontrollers such as Arduino Uno and NodeMCUs, sensors and computational intelligence. The sensors used in this case are LDR, thermistor, and PIR motion sensor. The system includes LED lights and fans as load. The raw data from the sensors is read by the Arduino and it serially communicates the raw data to both the NodeMCUs. The data is then converted to standard formats and uploaded to the ThingSpeak cloud server for data logging and analysis by one of the NodeMCU. Using the second NodeMCU, a Web server is created and used for manual control of the loads. This Wi-Fi server sends data to the NodeMCU as per the user input from the browser and this NodeMCU controls the load accordingly. A current sensor is also connected along the supply line for power measurement. The current sensor is an ACS712 20 A sensor which is connected to the NodeMCU and is responsible for uploading data to the ThingSpeak cloud server. The working model has three rooms for demonstration purpose but can be increased accordingly as per need with certain changes in system hardware model.

This paper describes the battery charging and discharging controller for a battery connected with... more This paper describes the battery charging and discharging controller for a battery connected with the micro grid. Some instruments or devices connected in a micro grid need uninterruptable power supply so we need a backup power supply system for those devices. Backup supply always increases the power quality of a system by giving a continuous service. In islanding mode of operation battery supply the critical load connected with it and in grid connected condition the main supply operates the devices. The battery feeds some loads in the micro grid in case of any grid failure occurs. This paper describes the operation of a battery from charging to discharging operation smoothly without disturbing the other circuit and critical loads connected to it. Total battery operation divided into three parts charging condition discharging condition and idle period. There is always a need of interfacing circuit while connecting a battery in the micro grid. This paper describes the interfacing cir...

International Journal of Smart grid, 2018

Microgrids are the key solution to handle the growing technical, environmental and economical con... more Microgrids are the key solution to handle the growing technical, environmental and economical concerns of existing power system networks. The purpose of this paper is to develop an intelligent and adaptive overcurrent protection system for a microgrid. This system is capable of monitoring, protecting and controlling the microgrid. A look up table is created and maintained at the central protection system of the microgrid, which has details of normal and faulted current in all feeders for various topologies of the microgrid system. It has the optimized values for time dial setting and operating time of relays for faults at a specific location in the reconfigured system, which is generated using Dual Simplex algorithm. Hence the Central Protection System aids in providing suitable overcurrent relay coordination to the microgrid, which may incur reduced network disconnection. The hardware prototype of the Central Protection System is realized, tested and validated on a balanced 21-bus microgrid system.

2022 IEEE 2nd International Symposium on Sustainable Energy, Signal Processing and Cyber Security (iSSSC)

2022 IEEE 2nd International Symposium on Sustainable Energy, Signal Processing and Cyber Security (iSSSC)