Susovan Mukhopadhyay - Academia.edu (original) (raw)

Papers by Susovan Mukhopadhyay

2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

Phase controlled resistor banks are common for temperature controlled heating systems. However, t... more Phase controlled resistor banks are common for temperature controlled heating systems. However, the high THD of current deters their widespread use. This paper presents a 3-phase 3-wire SCR phase controlled resistive heating system, using two banks of resistors, with same firing angle control of each bank with maximum power dissipation in the ratio of 3:2. One resistance bank is ‘Delta’ connected with phase switching while the other resistance bank is ‘Y’ connected with line switching. This arrangement prevents the triplen harmonics from entering into the supply system and eliminates some major characteristic harmonics from the line current. Thus, without using any additional filters, this arrangement permits power control of the resistance banks with a low current THD over a reasonable range of control. Simplicity in construction and operational requirements of the proposed topology makes it a viable and cost effective solution. Its modeling, analysis and performance assessment are presented along with support from simulation and experimental results.

2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020), 2020

This paper presents the operation of a new hybrid Static VAr compensator for distribution grid, c... more This paper presents the operation of a new hybrid Static VAr compensator for distribution grid, comprising of a Distribution Static Compensator (DSTATCOM) and a low THD thyristorized Static VAr Compensator (SVC), without the need for additional filters. The D-STATCOM is relieved of harmonic current compensation duty and thus can be of a smaller capacity. This combined system complies with the relevant harmonic standards and can effectively correct system power factor, stabilize bus voltage and mitigate voltage flicker under fluctuating load conditions. A new collaborative control method based on expert decision has been proposed for the combined system which can extract the full advantages of the respective subsystems as per demand of the operating condition. Theoretical analysis and simulation results show that the proposed system can meet the requirement of continuous dynamic reactive power compensation and voltage stabilization with low cost, high reliability and large capacity.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), 2022

This paper proposes a hybrid compensator for mitigating power quality problems in distribution sy... more This paper proposes a hybrid compensator for mitigating power quality problems in distribution systems. The hybrid compensator constitutes of Thyristor Switched Capacitor (TSC), Thyristor Controlled Reactor (TCR), a lower rating D-STATCOM and a 5th harmonic tuned passive LC filter. The Static var Compensator (SVC) or the TCR-TSC combination works in a coordinated way for the base var compensation. The D-STATCOM works in a coordinated scheme with the SVC and the single tuned LC filter to compensate fundamental var, reduce voltage flicker and also attenuate harmonic currents at the Point of Common Coupling (PCC). The D-STATCOM thus serves a dual role as a var compensator and as an active filter in Selective Harmonic Compensation (SHC) mode to attenuate the 7th harmonic current, hence improving the var compensation and harmonic current filtering at PCC. The proposed hybrid configuration exhibits very low line current THD in accordance with the relevant standards. Also the chance of resonance of the fixed passive filter with the source inductance has been eliminated in the coordination scheme. The simulation results show that the proposed hybrid system compensates var, reduces voltage flicker and harmonic currents at the PCC effectively. The proposed control and coordination scheme is simple to execute besides the hybrid system being highly robust in performance.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), 2022

This paper proposes a method for optimal sizing and placement in a radial distribution system, a ... more This paper proposes a method for optimal sizing and placement in a radial distribution system, a three phase DSTATCOM which is also capable of feeding active power through the dc link from a PV array (PV-DSTATCOM). The voltage stability of the system with incorporation of PVDSTATCOM at the critical buses is analyzed. This device can inject active power from PV source as well as compensate var demand to maintain voltage stability of the network. The point of common coupling (PCC) of the PV-DSTATCOM is determined by the proposed method for IEEE 38 bus radial distribution system. The proposed method employs modal analysis based eigen values and sensitivity indices of the network as well as assesses the voltage stability indices of each branch to find the critical buses where PV-DSTATCOM can be placed. The optimal sizing of the PV-DSTATCOM is also determined by the proposed method. The results obtained shows that connection of a PV-DSTATCOM in the system improves voltage stability and reduces line losses of the radial distribution system.

2021 IEEE 18th India Council International Conference (INDICON), 2021

This paper proposes a decentralized secondary control scheme suitable for islanded microgrid cons... more This paper proposes a decentralized secondary control scheme suitable for islanded microgrid consist of multiple VF controlled inverters connected in parallel. The controller is based on proportional-integral control to maintain frequency and voltage under different load switching conditions. Moreover improved system performance and reliability are accomplished by managing proper power sharing among the participating inverters. Particle swam optimization is adapted to find best suitable gain parameters of the proportional-integral controller. Multiple simulation results of the islanded microgrid using MATLAB are discussed in detail to establish the above mentioned two main objectives of the paper i.e. maintaining frequency, voltage and balance load sharing among inverters.

2019 IEEE International Conference on Sustainable Energy Technologies (ICSET), 2019

The Differential Induction Motor permits the connection of the two opposite side driving wheels o... more The Differential Induction Motor permits the connection of the two opposite side driving wheels of an electric vehicle directly to its two shafts at each side of the motor, providing driving power to the two wheels either when driving straight or when taking a turn, without the need for a differential gear mechanism or for two separate driving motors. This paper presents experimental data to demonstrate the suitability of the motor for electric vehicle application along with a proposed drive strategy.

2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2016

In this paper the conventional ‘Delta’ connected TCR bank is split into two identical ‘Delta’ ban... more In this paper the conventional ‘Delta’ connected TCR bank is split into two identical ‘Delta’ banks each having kVAr capacity half of the total TCR capacity. The study presented shows that such combination of two identical ‘Delta’ connected reactor banks, one with phase switching by thyristors and the other with line switching thyristor arrangement can effectively reduce the harmonic generation of TCR. Since both the three phase banks are connected in delta, the zero sequence triplen harmonics generated due to phase control of thyristors remain trapped inside the delta, thus reducing the harmonic injection into the power system. Further, some other major characteristic harmonics are also minimized in the TCR line current. Thus the new TCR yields a low current THD which meets the requisite harmonics standards and it can therefore be used as an economic solution for reactive power control over a reasonable range in high power grid without using any external harmonic filter or special ...

IEEE Transactions on Industrial Electronics, 2018

A 3-phase 3-wire thyristor controlled reactor topology is presented comprising of two banks, invo... more A 3-phase 3-wire thyristor controlled reactor topology is presented comprising of two banks, involving thyristor switched and controlled coupled reactors (TSCCR), one bank of which is “Δ” connected and the other being “Y” connected. Each TSCCR comprises of a reactor with two well coupled identical sections, two main thyristor back-to-back switches and an auxiliary thyristor switch such that the two sections can be either connected in parallel or in series. The ratio of the effective reactor values between the “Δ” bank phase and that of the “Y” bank, as well as the condition when and which switch shall be used for phase control, are selected from an optimization process. Such an arrangement prevents the triplen harmonics from entering into the supply system and some major characteristic harmonics are also eliminated from the source current. Thus, without using any additional filters or phase shifting transformer or oversized reactors, this scheme enables reactive power control with a...

A 1-phase Static VAr Compensator (SVC) topology is proposed using a tapped Thyristor Controlled R... more A 1-phase Static VAr Compensator (SVC) topology is proposed using a tapped Thyristor Controlled Reactor (TCR) and a third harmonic tuned filter. The TCR is controlled by firing angle delay over a limited range initially and its tapping is changed to create operation using different equivalent value of effective reactance, such that the amount of harmonics generated is limited. The third harmonic filter attenuates the corresponding harmonics to low magnitude and also presents a capacitive reactance at the fundamental frequency for VAr compensation. Such an arrangement prevents the third harmonics from entering into the supply system while some major characteristic harmonics are kept limited, along with control of VAr through the TCR. Thus, without using any additional complex set of individual harmonic filters, or additional capacitor bank, this scheme enables reactive power control with a low current THD over a reasonable range of control, meeting requisite harmonics standards. Simp...

The differential induction motor has a single stator with three phase winding and two axially sep... more The differential induction motor has a single stator with three phase winding and two axially separated rotors that are free to rotate independently. Thus each rotor has the independent capability to run either as motor or generator, permitting mechanical power flow out from the machine (motoring) or into the machine (generation), as long as the stator is electrically excited to establish the requisite flux. However, due to interdependency between the two rotors to some extent, implementation of a suitable control strategy is not straightforward. The machine is represented by its equivalent circuit while a Field Oriented Control strategy is proposed and implemented for the differential control of the two rotors, in order to establish a control over the speed of the two rotors independently. The control strategy is elaborated in this paper, supported by simulation as well as experimental data obtained from a laboratory prototype.

IEEE Transactions on Industry Applications, 2021

This article presents a new collaborative control method based on expert decision, proposed for t... more This article presents a new collaborative control method based on expert decision, proposed for the combined system of an ac grid with a low THD thyristorized static var compensator (SVC), interconnected to a dc microgrid through a distribution static compensator (D-STATCOM) that also works as a bidirectional power converter. The combination of large rating SVC and a low rating D-STATCOM functions as a hybrid compensator for the ac distribution grid. In the combined mode of operation, the D-STATCOM mitigates voltage fluctuations and compensates initial var demands, while the SVC caters to the base var requirements. The D-STATCOM has also been used for integration of a dc microgrid to the utility grid, permitting exchange of power between the grids and thereby reducing voltage fluctuations of both the systems. The proposed collaborative control method based on expert decision can extract the full advantages of the respective subsystems as per demand of the operating condition. This combined system complies with the relevant harmonic standards and can effectively correct system power factor, stabilize bus voltage, and mitigate voltage flicker under fluctuating load conditions. Theoretical analyses with simulation results as well as experimental results show that the proposed system can meet the requirement of continuous dynamic reactive power compensation and voltage stabilization with low cost, high reliability, and large capacity.

2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018

As the Microgrid (MG) increase in spatial size they become more prone to faults due to vagaries o... more As the Microgrid (MG) increase in spatial size they become more prone to faults due to vagaries of nature. Apart from the device level protection available for the devices of the inverters a system level protection is necessary to protect the entire power system of the MG. This paper presents a new control methodology for uninterrupted power flow in islanded MG during fault condition. The fault current is first limited and then the faulty section is taken out. A voltage-current controller in coordination with logical controller is proposed for smooth detection and management of fault current. The performance of the controllers and its effectiveness has been tested through simulation studies using a standard MG model.

2020 IEEE Calcutta Conference (CALCON), 2020

Recent days have seen a high penetration of renewable energy resources bringing a drastic reforma... more Recent days have seen a high penetration of renewable energy resources bringing a drastic reformation of modern power system. The combined operation of renewable energy resources in power system introduced the concept of microgrid, which can efficiently satisfy the load demand in small scale power distribution. Under such circumstances microgrids are prone to several protection issues. Several topologies are incorporated to ensure protection in microgrid scenario. This paper proposes a proportional resonant based current controller which efficiently handles the protection issue under dynamic and transient state operation of microgrid. Several case studies are carried out in MATLAB Simulink environment and the results validated using proposed proportional resonant based microgrid model.

IET Power Electronics, 2019

This work presents a three-phase thyristor-controlled reactor (TCR), which makes use of two const... more This work presents a three-phase thyristor-controlled reactor (TCR), which makes use of two constituent banks of controlled reactors, with coordinated control of the triggering angle of both the banks. The first reactor bank has a set of 'delta' connected back-to-back thyristor switches with a balanced set of reactors in series with each switch, while the second reactor bank also has back-to-back thyristor switches in 'delta' connection but with a balanced set of reactors in series with each line. It is demonstrated that this arrangement prevents some major current harmonics in the supply line by proper choice of the maximum kVAr ratio between the two reactor banks. The use of delta connected switches in both banks reduces the current rating of the switches. Hence, without using any phase-shifting isolation transformer or filters, the proposed technique permits control of reactive power over a reasonable range, with a low current total harmonic distortion meeting existing harmonics standards. Simple construction and operation of the proposed TCR make it an attractive and cheaper solution. The modelling, analysis and performance assessment of the new TCR are presented.

IEEE Transactions on Industry Applications, 2017

The conventional 'Delta' connected Thyristor Controlled Reactor (TCR) bank used for Static VAR Co... more The conventional 'Delta' connected Thyristor Controlled Reactor (TCR) bank used for Static VAR Compensation (SVC) and other applications is proposed to be split into two identical 'Delta' banks each having kVAR capacity half of the total TCR capacity. The study presented shows that such combination of two identical 'Delta' connected reactor banks, one with phase switching by thyristors and the other with line switching thyristor arrangement can effectively reduce the harmonic generation of the TCR. Since both the three phase banks are connected in delta, the zero sequence triplen harmonics generated due to phase control of thyristors remain trapped inside the delta, thus reducing the harmonic injection into the power system. Further, some other major characteristic harmonics are also minimized in the TCR line current. Thus the proposed TCR yields a low current THD which meets the requisite harmonics standards and it can therefore be used as an economic solution for reactive power control over a reasonable range in high power grid without using any external harmonic filter or special phase shifting transformer. This paper describes in detail the modeling, analysis and performance assessment of the proposed scheme. Simulation results are furnished to evaluate the output characteristics of the scheme under varying operating conditions. Finally, experimental results are presented, which proves the theoretical proposition.

IEEE Transactions on Industrial Electronics, 2017

A 3-phase 3-wire Thyristor Controlled Reactor topology is presented comprising of two reactor ban... more A 3-phase 3-wire Thyristor Controlled Reactor topology is presented comprising of two reactor banks, involving simultaneous firing angle control of both banks having maximum kVAr in the ratio of 60:40. The first reactor bank is 'Δ' connected and has phase switching while the second reactor bank is either 'Δ' or equivalent 'Y' connected with line switching. Such an arrangement prevents the triplen harmonics from entering into the supply system and some major characteristic harmonics can also be eliminated from the TCR line current due to the selection of the ratings of the two reactor banks. Thus, without using any additional filters or phase shifting transformer, this scheme enables reactive power control with a low current THD over a reasonable range of control, meeting requisite harmonics standards. Simplicity in construction and operational requirements of the proposed topology makes it a viable and cost effective solution. Its modeling, analysis and performance assessment are presented. Simulation and experimental results support the theoretical proposition.

IEEE Transactions on Industrial Electronics, 2017

International Journal of Power Electronics and Drive Systems (IJPEDS), 2012

This paper presents the software implementation of a simple sector independent Space Vector Modul... more This paper presents the software implementation of a simple sector independent Space Vector Modulation (SVPWM) technique for simple motor drive applications using DSP processor. The closed loop control scheme with Volts/Hz principle, suitably regulates the switching period and operates with a fixed set of compare register values. The Space Vector Pulse Width Modulation hardware module on the TI TMS320LF2407A is used to produce the Pulse Width Modulated (PWM) pulses with four switching states in one PWM period. In contrast to the conventional scheme, the algorithm developed here, eliminates the computational burden involved in determining the magnitude and phase of the voltage vector, the corresponding sector and the decomposition matrices for calculating the switching time segments. A 1hp, 3 phase induction motor fed from an IGBT based inverter module is tested with the control pulses generated from the DSP processor and the performance is found to be satisfactory. DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.348

2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

Phase controlled resistor banks are common for temperature controlled heating systems. However, t... more Phase controlled resistor banks are common for temperature controlled heating systems. However, the high THD of current deters their widespread use. This paper presents a 3-phase 3-wire SCR phase controlled resistive heating system, using two banks of resistors, with same firing angle control of each bank with maximum power dissipation in the ratio of 3:2. One resistance bank is ‘Delta’ connected with phase switching while the other resistance bank is ‘Y’ connected with line switching. This arrangement prevents the triplen harmonics from entering into the supply system and eliminates some major characteristic harmonics from the line current. Thus, without using any additional filters, this arrangement permits power control of the resistance banks with a low current THD over a reasonable range of control. Simplicity in construction and operational requirements of the proposed topology makes it a viable and cost effective solution. Its modeling, analysis and performance assessment are presented along with support from simulation and experimental results.

2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020), 2020

This paper presents the operation of a new hybrid Static VAr compensator for distribution grid, c... more This paper presents the operation of a new hybrid Static VAr compensator for distribution grid, comprising of a Distribution Static Compensator (DSTATCOM) and a low THD thyristorized Static VAr Compensator (SVC), without the need for additional filters. The D-STATCOM is relieved of harmonic current compensation duty and thus can be of a smaller capacity. This combined system complies with the relevant harmonic standards and can effectively correct system power factor, stabilize bus voltage and mitigate voltage flicker under fluctuating load conditions. A new collaborative control method based on expert decision has been proposed for the combined system which can extract the full advantages of the respective subsystems as per demand of the operating condition. Theoretical analysis and simulation results show that the proposed system can meet the requirement of continuous dynamic reactive power compensation and voltage stabilization with low cost, high reliability and large capacity.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), 2022

This paper proposes a hybrid compensator for mitigating power quality problems in distribution sy... more This paper proposes a hybrid compensator for mitigating power quality problems in distribution systems. The hybrid compensator constitutes of Thyristor Switched Capacitor (TSC), Thyristor Controlled Reactor (TCR), a lower rating D-STATCOM and a 5th harmonic tuned passive LC filter. The Static var Compensator (SVC) or the TCR-TSC combination works in a coordinated way for the base var compensation. The D-STATCOM works in a coordinated scheme with the SVC and the single tuned LC filter to compensate fundamental var, reduce voltage flicker and also attenuate harmonic currents at the Point of Common Coupling (PCC). The D-STATCOM thus serves a dual role as a var compensator and as an active filter in Selective Harmonic Compensation (SHC) mode to attenuate the 7th harmonic current, hence improving the var compensation and harmonic current filtering at PCC. The proposed hybrid configuration exhibits very low line current THD in accordance with the relevant standards. Also the chance of resonance of the fixed passive filter with the source inductance has been eliminated in the coordination scheme. The simulation results show that the proposed hybrid system compensates var, reduces voltage flicker and harmonic currents at the PCC effectively. The proposed control and coordination scheme is simple to execute besides the hybrid system being highly robust in performance.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), 2022

This paper proposes a method for optimal sizing and placement in a radial distribution system, a ... more This paper proposes a method for optimal sizing and placement in a radial distribution system, a three phase DSTATCOM which is also capable of feeding active power through the dc link from a PV array (PV-DSTATCOM). The voltage stability of the system with incorporation of PVDSTATCOM at the critical buses is analyzed. This device can inject active power from PV source as well as compensate var demand to maintain voltage stability of the network. The point of common coupling (PCC) of the PV-DSTATCOM is determined by the proposed method for IEEE 38 bus radial distribution system. The proposed method employs modal analysis based eigen values and sensitivity indices of the network as well as assesses the voltage stability indices of each branch to find the critical buses where PV-DSTATCOM can be placed. The optimal sizing of the PV-DSTATCOM is also determined by the proposed method. The results obtained shows that connection of a PV-DSTATCOM in the system improves voltage stability and reduces line losses of the radial distribution system.

2021 IEEE 18th India Council International Conference (INDICON), 2021

This paper proposes a decentralized secondary control scheme suitable for islanded microgrid cons... more This paper proposes a decentralized secondary control scheme suitable for islanded microgrid consist of multiple VF controlled inverters connected in parallel. The controller is based on proportional-integral control to maintain frequency and voltage under different load switching conditions. Moreover improved system performance and reliability are accomplished by managing proper power sharing among the participating inverters. Particle swam optimization is adapted to find best suitable gain parameters of the proportional-integral controller. Multiple simulation results of the islanded microgrid using MATLAB are discussed in detail to establish the above mentioned two main objectives of the paper i.e. maintaining frequency, voltage and balance load sharing among inverters.

2019 IEEE International Conference on Sustainable Energy Technologies (ICSET), 2019

The Differential Induction Motor permits the connection of the two opposite side driving wheels o... more The Differential Induction Motor permits the connection of the two opposite side driving wheels of an electric vehicle directly to its two shafts at each side of the motor, providing driving power to the two wheels either when driving straight or when taking a turn, without the need for a differential gear mechanism or for two separate driving motors. This paper presents experimental data to demonstrate the suitability of the motor for electric vehicle application along with a proposed drive strategy.

2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2016

In this paper the conventional ‘Delta’ connected TCR bank is split into two identical ‘Delta’ ban... more In this paper the conventional ‘Delta’ connected TCR bank is split into two identical ‘Delta’ banks each having kVAr capacity half of the total TCR capacity. The study presented shows that such combination of two identical ‘Delta’ connected reactor banks, one with phase switching by thyristors and the other with line switching thyristor arrangement can effectively reduce the harmonic generation of TCR. Since both the three phase banks are connected in delta, the zero sequence triplen harmonics generated due to phase control of thyristors remain trapped inside the delta, thus reducing the harmonic injection into the power system. Further, some other major characteristic harmonics are also minimized in the TCR line current. Thus the new TCR yields a low current THD which meets the requisite harmonics standards and it can therefore be used as an economic solution for reactive power control over a reasonable range in high power grid without using any external harmonic filter or special ...

IEEE Transactions on Industrial Electronics, 2018

A 3-phase 3-wire thyristor controlled reactor topology is presented comprising of two banks, invo... more A 3-phase 3-wire thyristor controlled reactor topology is presented comprising of two banks, involving thyristor switched and controlled coupled reactors (TSCCR), one bank of which is “Δ” connected and the other being “Y” connected. Each TSCCR comprises of a reactor with two well coupled identical sections, two main thyristor back-to-back switches and an auxiliary thyristor switch such that the two sections can be either connected in parallel or in series. The ratio of the effective reactor values between the “Δ” bank phase and that of the “Y” bank, as well as the condition when and which switch shall be used for phase control, are selected from an optimization process. Such an arrangement prevents the triplen harmonics from entering into the supply system and some major characteristic harmonics are also eliminated from the source current. Thus, without using any additional filters or phase shifting transformer or oversized reactors, this scheme enables reactive power control with a...

A 1-phase Static VAr Compensator (SVC) topology is proposed using a tapped Thyristor Controlled R... more A 1-phase Static VAr Compensator (SVC) topology is proposed using a tapped Thyristor Controlled Reactor (TCR) and a third harmonic tuned filter. The TCR is controlled by firing angle delay over a limited range initially and its tapping is changed to create operation using different equivalent value of effective reactance, such that the amount of harmonics generated is limited. The third harmonic filter attenuates the corresponding harmonics to low magnitude and also presents a capacitive reactance at the fundamental frequency for VAr compensation. Such an arrangement prevents the third harmonics from entering into the supply system while some major characteristic harmonics are kept limited, along with control of VAr through the TCR. Thus, without using any additional complex set of individual harmonic filters, or additional capacitor bank, this scheme enables reactive power control with a low current THD over a reasonable range of control, meeting requisite harmonics standards. Simp...

The differential induction motor has a single stator with three phase winding and two axially sep... more The differential induction motor has a single stator with three phase winding and two axially separated rotors that are free to rotate independently. Thus each rotor has the independent capability to run either as motor or generator, permitting mechanical power flow out from the machine (motoring) or into the machine (generation), as long as the stator is electrically excited to establish the requisite flux. However, due to interdependency between the two rotors to some extent, implementation of a suitable control strategy is not straightforward. The machine is represented by its equivalent circuit while a Field Oriented Control strategy is proposed and implemented for the differential control of the two rotors, in order to establish a control over the speed of the two rotors independently. The control strategy is elaborated in this paper, supported by simulation as well as experimental data obtained from a laboratory prototype.

IEEE Transactions on Industry Applications, 2021

This article presents a new collaborative control method based on expert decision, proposed for t... more This article presents a new collaborative control method based on expert decision, proposed for the combined system of an ac grid with a low THD thyristorized static var compensator (SVC), interconnected to a dc microgrid through a distribution static compensator (D-STATCOM) that also works as a bidirectional power converter. The combination of large rating SVC and a low rating D-STATCOM functions as a hybrid compensator for the ac distribution grid. In the combined mode of operation, the D-STATCOM mitigates voltage fluctuations and compensates initial var demands, while the SVC caters to the base var requirements. The D-STATCOM has also been used for integration of a dc microgrid to the utility grid, permitting exchange of power between the grids and thereby reducing voltage fluctuations of both the systems. The proposed collaborative control method based on expert decision can extract the full advantages of the respective subsystems as per demand of the operating condition. This combined system complies with the relevant harmonic standards and can effectively correct system power factor, stabilize bus voltage, and mitigate voltage flicker under fluctuating load conditions. Theoretical analyses with simulation results as well as experimental results show that the proposed system can meet the requirement of continuous dynamic reactive power compensation and voltage stabilization with low cost, high reliability, and large capacity.

2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018

As the Microgrid (MG) increase in spatial size they become more prone to faults due to vagaries o... more As the Microgrid (MG) increase in spatial size they become more prone to faults due to vagaries of nature. Apart from the device level protection available for the devices of the inverters a system level protection is necessary to protect the entire power system of the MG. This paper presents a new control methodology for uninterrupted power flow in islanded MG during fault condition. The fault current is first limited and then the faulty section is taken out. A voltage-current controller in coordination with logical controller is proposed for smooth detection and management of fault current. The performance of the controllers and its effectiveness has been tested through simulation studies using a standard MG model.

2020 IEEE Calcutta Conference (CALCON), 2020

Recent days have seen a high penetration of renewable energy resources bringing a drastic reforma... more Recent days have seen a high penetration of renewable energy resources bringing a drastic reformation of modern power system. The combined operation of renewable energy resources in power system introduced the concept of microgrid, which can efficiently satisfy the load demand in small scale power distribution. Under such circumstances microgrids are prone to several protection issues. Several topologies are incorporated to ensure protection in microgrid scenario. This paper proposes a proportional resonant based current controller which efficiently handles the protection issue under dynamic and transient state operation of microgrid. Several case studies are carried out in MATLAB Simulink environment and the results validated using proposed proportional resonant based microgrid model.

IET Power Electronics, 2019

This work presents a three-phase thyristor-controlled reactor (TCR), which makes use of two const... more This work presents a three-phase thyristor-controlled reactor (TCR), which makes use of two constituent banks of controlled reactors, with coordinated control of the triggering angle of both the banks. The first reactor bank has a set of 'delta' connected back-to-back thyristor switches with a balanced set of reactors in series with each switch, while the second reactor bank also has back-to-back thyristor switches in 'delta' connection but with a balanced set of reactors in series with each line. It is demonstrated that this arrangement prevents some major current harmonics in the supply line by proper choice of the maximum kVAr ratio between the two reactor banks. The use of delta connected switches in both banks reduces the current rating of the switches. Hence, without using any phase-shifting isolation transformer or filters, the proposed technique permits control of reactive power over a reasonable range, with a low current total harmonic distortion meeting existing harmonics standards. Simple construction and operation of the proposed TCR make it an attractive and cheaper solution. The modelling, analysis and performance assessment of the new TCR are presented.

IEEE Transactions on Industry Applications, 2017

The conventional 'Delta' connected Thyristor Controlled Reactor (TCR) bank used for Static VAR Co... more The conventional 'Delta' connected Thyristor Controlled Reactor (TCR) bank used for Static VAR Compensation (SVC) and other applications is proposed to be split into two identical 'Delta' banks each having kVAR capacity half of the total TCR capacity. The study presented shows that such combination of two identical 'Delta' connected reactor banks, one with phase switching by thyristors and the other with line switching thyristor arrangement can effectively reduce the harmonic generation of the TCR. Since both the three phase banks are connected in delta, the zero sequence triplen harmonics generated due to phase control of thyristors remain trapped inside the delta, thus reducing the harmonic injection into the power system. Further, some other major characteristic harmonics are also minimized in the TCR line current. Thus the proposed TCR yields a low current THD which meets the requisite harmonics standards and it can therefore be used as an economic solution for reactive power control over a reasonable range in high power grid without using any external harmonic filter or special phase shifting transformer. This paper describes in detail the modeling, analysis and performance assessment of the proposed scheme. Simulation results are furnished to evaluate the output characteristics of the scheme under varying operating conditions. Finally, experimental results are presented, which proves the theoretical proposition.

IEEE Transactions on Industrial Electronics, 2017

A 3-phase 3-wire Thyristor Controlled Reactor topology is presented comprising of two reactor ban... more A 3-phase 3-wire Thyristor Controlled Reactor topology is presented comprising of two reactor banks, involving simultaneous firing angle control of both banks having maximum kVAr in the ratio of 60:40. The first reactor bank is 'Δ' connected and has phase switching while the second reactor bank is either 'Δ' or equivalent 'Y' connected with line switching. Such an arrangement prevents the triplen harmonics from entering into the supply system and some major characteristic harmonics can also be eliminated from the TCR line current due to the selection of the ratings of the two reactor banks. Thus, without using any additional filters or phase shifting transformer, this scheme enables reactive power control with a low current THD over a reasonable range of control, meeting requisite harmonics standards. Simplicity in construction and operational requirements of the proposed topology makes it a viable and cost effective solution. Its modeling, analysis and performance assessment are presented. Simulation and experimental results support the theoretical proposition.

IEEE Transactions on Industrial Electronics, 2017

International Journal of Power Electronics and Drive Systems (IJPEDS), 2012

This paper presents the software implementation of a simple sector independent Space Vector Modul... more This paper presents the software implementation of a simple sector independent Space Vector Modulation (SVPWM) technique for simple motor drive applications using DSP processor. The closed loop control scheme with Volts/Hz principle, suitably regulates the switching period and operates with a fixed set of compare register values. The Space Vector Pulse Width Modulation hardware module on the TI TMS320LF2407A is used to produce the Pulse Width Modulated (PWM) pulses with four switching states in one PWM period. In contrast to the conventional scheme, the algorithm developed here, eliminates the computational burden involved in determining the magnitude and phase of the voltage vector, the corresponding sector and the decomposition matrices for calculating the switching time segments. A 1hp, 3 phase induction motor fed from an IGBT based inverter module is tested with the control pulses generated from the DSP processor and the performance is found to be satisfactory. DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.348