Saravana Prakash P - Academia.edu (original) (raw)

Papers by Saravana Prakash P

IEEE Transactions on Power Electronics

2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

IEEE Journal of Emerging and Selected Topics in Power Electronics, Sep 1, 2020

This paper proposes a 20-pulse asymmetric multiphase converter (AMPC) suitable for medium and hig... more This paper proposes a 20-pulse asymmetric multiphase converter (AMPC) suitable for medium and high-power applications. Unlike the other state-of-the-art 20-pulse delta connected autotransformers, the proposed delta connected AMPC has an ability to reduce input harmonics, maintains high efficiency and requires a magnetic rating of only 30.12% of the nominal load thereby a significant reduction in space, weight, and overall cost required are the salient features of the proposed AMPC. A detailed power quality performance analysis and efficiency calculation are discussed. Firstly, the proposed AMPC configuration is simulated in MATLAB/Simulink environment for evaluating its viability under different loading conditions, and the results are illustrated. A detailed comparison of the proposed AMPC configuration with other multi-pulse transformers is included which confirms the merits of the proposed system. Also, a prototype is developed, and the experimental measurements obtained are presented to validate the feasibility and operability of the proposed AMPC. The proposed AMPC offers a total harmonic distortion of 3.7% and can operate at near-unity power factor complying with the IEEE and IEC standards.

To enhance the ability of harmonic suppression in a 12-pulse diode bridge rectifier (DBR) using a... more To enhance the ability of harmonic suppression in a 12-pulse diode bridge rectifier (DBR) using a DC side current imposition technique is proposed in this paper. The 12-pulse operation is achieved by a zigzag auto-connected transformer. The standard 12-pulse DBR does not satisfy the IEEE-519 standard and thus the current imposition technique can be used on the DC side to mitigate the input line current harmonic distortion. The current imposition circuit on DC side contains a doubler circuit along with the tapped interphase transformer (TIPT). The zigzag configured autoconnected transformer has the function to avoid zero sequence components and thereby expel the need for zero-sequence blocking transformer. When the multi-winding interphase reactor is designed optimally, the pulse number of load voltage can be increased from 12 to 24 and by using the TIPT the pulse number of output voltage can be further increased from 24 to 36. The proposed configuration is analyzed and simulated in the MATLAB Simulink and validated with hardware results. The results show that the proposed method improves the power quality by reducing the total harmonic distortion in the input line current.

This paper presents the design and implementation of a three-phase buck type unity power factor r... more This paper presents the design and implementation of a three-phase buck type unity power factor rectifier used for distribution systems. The AC-DC converter topology considered in this paper is named as SWISS rectifier, consists of front-end three-phase diode bridge rectifier with active current injection circuit and back-end DC-DC buck converter. The characteristics of the AC-DC converter topology, including the principle of operation, modulation schemes, conduction state analysis, and control strategy are discussed in detail. Further, the analytical expression for the loss calculation is performed. Extensive simulation is carried out for the converter system, and the practicability of the converter system is verified by conducting a test on the constructed hardware prototype.

This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) ... more This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) using a modular full-bridge dc-dc converter as an intermediate converter. Among the different types of dc-dc converters, the straightforward and uncomplicated boost converter is selected in order to obtain the maximal power from the SPV array. The straightforward boost converter with reduced part count has inherent features of minimizing the output current ripples and possessing an unbounded region for maximum power point extraction. The improved efficiency of the converter is achieved by designing the SPV array to deliver maximum power at rated dc voltage and maximum switch utilization of the boost converter. The design, analysis and operating modes are explained for the proposed converter and the performance is validated through MATLAB/Simulink based simulation.

This paper discusses the solar photovoltaic (SPV) array fed telecom load using modular push-pull ... more This paper discusses the solar photovoltaic (SPV) array fed telecom load using modular push-pull buck dc-dc converter as an intermediate converter. The straightforward boost converter with lesser number of components and single switch device has inherent features of reducing the ripples in its output current. Also, the proposed front-end structure extracts maximum power in the boundless region. The SPV array is designed such that the power at rated dc voltage is supplied to the telecon load and maximum switch utilization of boost converter is achieved which results in improved efficiency of the converter. The design and analysis are carried out for the proposed converter and the performance of the proposed system is validated using MATLAB based simulation.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), Jan 2, 2022

This paper addresses a multi-port interleaved boost converter for base transceiver station (BTS) ... more This paper addresses a multi-port interleaved boost converter for base transceiver station (BTS) load with photovoltaic (PY) as a source and battery as backup energy storage device. The converter is designed to control the power flow from PV, battery and BTS load, and to regulate BTS load for 48V. In this paper, different modes of operations of converter are studied which depends on the availability of power from source and the battery. Further, steady state analysis and average state space equations of the proposed converter have been analysed. Furthermore, small signal modelling of the converter is carried out for the proposed converter. The MATLAB/SIMULINIC based analysis has been (a) carried out to verify the proper operation of the converter.

This paper presents a circuit configuration to reduce the harmonic contents at the AC mains of a ... more This paper presents a circuit configuration to reduce the harmonic contents at the AC mains of a 12-pulse zigzag configured autotransformer based DBR. The proposed circuit configuration employs a tapped interphase bridge rectifier at the DC side of 12-pulse DBR that results in higher pulses in the supply current. Thus, reducing the harmonic content and thereby improving the power quality of the system. Since the autotransformer employed is zigzag configured, the need for ZSBT is eliminated. Moreover, the proposed circuit configuration at the DC side shapes the supply current near to a sine wave. Further, the proposed configuration is analyzed, simulated in MATLAB Simulink and the simulation results are presented, which confirms the improvement in power quality parameters in the input AC line current. Further, the viability of the proposed configuration is verified by experimental results which confirm the suitability of the proposed configuration in AC-DC applications.

In this paper an improved switched mode telecom rectifier for a 12kW telecommunication system is ... more In this paper an improved switched mode telecom rectifier for a 12kW telecommunication system is presented. An improved telecom rectifier is a combination of phase-shift transformer based ac-dc converter and passive high pass filter. The phase-shift transformer and high pass filter is realized with a fractional magnetic rating of the load. The supply current is almost sinusoidal with low total harmonic distortion, and the power factor (PF) is close to unity. The complete design of phase-shift transformer based ac-dc converter and passive high pass filter is presented in this paper. The 12kW telecom rectifier is designed, modeled and simulated to reduce the total harmonic distortion (THD) of the input ac mains current and to improve the power factor. A laboratory prototype of phase-shift transformer based ac-dc converter is developed and the results are presented to validate the design topology.

IEEE Transactions on Industry Applications, Sep 1, 2018

This paper highlights the power quality issues and explains the remedial measures taken by means ... more This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here zigzag transformer is used as the current injection device so that the advantages pertaining to the zigzag transformer is effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the DC-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results.

2023 IEEE 3rd International Conference on Sustainable Energy and Future Electric Transportation (SEFET)

IEEE Transactions on Industry Applications, 2018

This paper highlights the power quality issues and explains the remedial measures taken by means ... more This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here zigzag transformer is used as the current injection device so that the advantages pertaining to the zigzag transformer is effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the DC-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results.

2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)

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

High power industrial loads are often fed from front-end multi-pulse rectifier as its ability to ... more High power industrial loads are often fed from front-end multi-pulse rectifier as its ability to effectively and inexpensively mitigate the harmonics on the AC side is achieved by the multi-pulse autoconfigured transformer. This paper analyzes and investigates the operability of the zigzag autoconfigured transformer based 12-pulse rectifier when one of the input terminals is open, i.e., single-phasing. Contrary to the prior art multi-pulse rectifiers, the availability of neutral point in zigzag autoconfigured transformer results in normal operation at DC side during single-phasing. A detailed MATLAB Simulation is carried out to understand the single-phasing operation of the zigzag autoconfigured transformer. Further, the experimental results from the laboratory prototype are presented to validate the simulated results.

2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), 2017

This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) ... more This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) using a modular full-bridge dc-dc converter as an intermediate converter. Among the different types of dc-dc converters, the straightforward and uncomplicated boost converter is selected in order to obtain the maximal power from the SPV array. The straightforward boost converter with reduced part count has inherent features of minimizing the output current ripples and possessing an unbounded region for maximum power point extraction. The improved efficiency of the converter is achieved by designing the SPV array to deliver maximum power at rated dc voltage and maximum switch utilization of the boost converter. The design, analysis and operating modes are explained for the proposed converter and the performance is validated through MATLAB/Simulink based simulation.

2016 First International Conference on Sustainable Green Buildings and Communities (SGBC), 2016

In this paper a front-end converter having third harmonic current injection technique is used for... more In this paper a front-end converter having third harmonic current injection technique is used for improving input current shape as near sinusoidal. Here zig-zag transformer is used as the current injection device so that the advantages pertaining to zig-zag transformer is utilized effectively. The third harmonic current injection device along with the three-level boost converter at the output stage will increase the dc-link voltage and the current is injected through zig-zag transformer. The power quality is well improved using third harmonic current modulated front-end structure which is very well applicable to telecom load having the high current low voltage. Extensive simulation is carried out for the 12 kW load and the results are verified through experimental setup. The experimental setup is tested for reduced voltage rating and the test results are presented.

IEEE Transactions on Power Electronics

2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

IEEE Journal of Emerging and Selected Topics in Power Electronics, Sep 1, 2020

This paper proposes a 20-pulse asymmetric multiphase converter (AMPC) suitable for medium and hig... more This paper proposes a 20-pulse asymmetric multiphase converter (AMPC) suitable for medium and high-power applications. Unlike the other state-of-the-art 20-pulse delta connected autotransformers, the proposed delta connected AMPC has an ability to reduce input harmonics, maintains high efficiency and requires a magnetic rating of only 30.12% of the nominal load thereby a significant reduction in space, weight, and overall cost required are the salient features of the proposed AMPC. A detailed power quality performance analysis and efficiency calculation are discussed. Firstly, the proposed AMPC configuration is simulated in MATLAB/Simulink environment for evaluating its viability under different loading conditions, and the results are illustrated. A detailed comparison of the proposed AMPC configuration with other multi-pulse transformers is included which confirms the merits of the proposed system. Also, a prototype is developed, and the experimental measurements obtained are presented to validate the feasibility and operability of the proposed AMPC. The proposed AMPC offers a total harmonic distortion of 3.7% and can operate at near-unity power factor complying with the IEEE and IEC standards.

To enhance the ability of harmonic suppression in a 12-pulse diode bridge rectifier (DBR) using a... more To enhance the ability of harmonic suppression in a 12-pulse diode bridge rectifier (DBR) using a DC side current imposition technique is proposed in this paper. The 12-pulse operation is achieved by a zigzag auto-connected transformer. The standard 12-pulse DBR does not satisfy the IEEE-519 standard and thus the current imposition technique can be used on the DC side to mitigate the input line current harmonic distortion. The current imposition circuit on DC side contains a doubler circuit along with the tapped interphase transformer (TIPT). The zigzag configured autoconnected transformer has the function to avoid zero sequence components and thereby expel the need for zero-sequence blocking transformer. When the multi-winding interphase reactor is designed optimally, the pulse number of load voltage can be increased from 12 to 24 and by using the TIPT the pulse number of output voltage can be further increased from 24 to 36. The proposed configuration is analyzed and simulated in the MATLAB Simulink and validated with hardware results. The results show that the proposed method improves the power quality by reducing the total harmonic distortion in the input line current.

This paper presents the design and implementation of a three-phase buck type unity power factor r... more This paper presents the design and implementation of a three-phase buck type unity power factor rectifier used for distribution systems. The AC-DC converter topology considered in this paper is named as SWISS rectifier, consists of front-end three-phase diode bridge rectifier with active current injection circuit and back-end DC-DC buck converter. The characteristics of the AC-DC converter topology, including the principle of operation, modulation schemes, conduction state analysis, and control strategy are discussed in detail. Further, the analytical expression for the loss calculation is performed. Extensive simulation is carried out for the converter system, and the practicability of the converter system is verified by conducting a test on the constructed hardware prototype.

This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) ... more This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) using a modular full-bridge dc-dc converter as an intermediate converter. Among the different types of dc-dc converters, the straightforward and uncomplicated boost converter is selected in order to obtain the maximal power from the SPV array. The straightforward boost converter with reduced part count has inherent features of minimizing the output current ripples and possessing an unbounded region for maximum power point extraction. The improved efficiency of the converter is achieved by designing the SPV array to deliver maximum power at rated dc voltage and maximum switch utilization of the boost converter. The design, analysis and operating modes are explained for the proposed converter and the performance is validated through MATLAB/Simulink based simulation.

This paper discusses the solar photovoltaic (SPV) array fed telecom load using modular push-pull ... more This paper discusses the solar photovoltaic (SPV) array fed telecom load using modular push-pull buck dc-dc converter as an intermediate converter. The straightforward boost converter with lesser number of components and single switch device has inherent features of reducing the ripples in its output current. Also, the proposed front-end structure extracts maximum power in the boundless region. The SPV array is designed such that the power at rated dc voltage is supplied to the telecon load and maximum switch utilization of boost converter is achieved which results in improved efficiency of the converter. The design and analysis are carried out for the proposed converter and the performance of the proposed system is validated using MATLAB based simulation.

2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), Jan 2, 2022

This paper addresses a multi-port interleaved boost converter for base transceiver station (BTS) ... more This paper addresses a multi-port interleaved boost converter for base transceiver station (BTS) load with photovoltaic (PY) as a source and battery as backup energy storage device. The converter is designed to control the power flow from PV, battery and BTS load, and to regulate BTS load for 48V. In this paper, different modes of operations of converter are studied which depends on the availability of power from source and the battery. Further, steady state analysis and average state space equations of the proposed converter have been analysed. Furthermore, small signal modelling of the converter is carried out for the proposed converter. The MATLAB/SIMULINIC based analysis has been (a) carried out to verify the proper operation of the converter.

This paper presents a circuit configuration to reduce the harmonic contents at the AC mains of a ... more This paper presents a circuit configuration to reduce the harmonic contents at the AC mains of a 12-pulse zigzag configured autotransformer based DBR. The proposed circuit configuration employs a tapped interphase bridge rectifier at the DC side of 12-pulse DBR that results in higher pulses in the supply current. Thus, reducing the harmonic content and thereby improving the power quality of the system. Since the autotransformer employed is zigzag configured, the need for ZSBT is eliminated. Moreover, the proposed circuit configuration at the DC side shapes the supply current near to a sine wave. Further, the proposed configuration is analyzed, simulated in MATLAB Simulink and the simulation results are presented, which confirms the improvement in power quality parameters in the input AC line current. Further, the viability of the proposed configuration is verified by experimental results which confirm the suitability of the proposed configuration in AC-DC applications.

In this paper an improved switched mode telecom rectifier for a 12kW telecommunication system is ... more In this paper an improved switched mode telecom rectifier for a 12kW telecommunication system is presented. An improved telecom rectifier is a combination of phase-shift transformer based ac-dc converter and passive high pass filter. The phase-shift transformer and high pass filter is realized with a fractional magnetic rating of the load. The supply current is almost sinusoidal with low total harmonic distortion, and the power factor (PF) is close to unity. The complete design of phase-shift transformer based ac-dc converter and passive high pass filter is presented in this paper. The 12kW telecom rectifier is designed, modeled and simulated to reduce the total harmonic distortion (THD) of the input ac mains current and to improve the power factor. A laboratory prototype of phase-shift transformer based ac-dc converter is developed and the results are presented to validate the design topology.

IEEE Transactions on Industry Applications, Sep 1, 2018

This paper highlights the power quality issues and explains the remedial measures taken by means ... more This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here zigzag transformer is used as the current injection device so that the advantages pertaining to the zigzag transformer is effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the DC-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results.

2023 IEEE 3rd International Conference on Sustainable Energy and Future Electric Transportation (SEFET)

IEEE Transactions on Industry Applications, 2018

This paper highlights the power quality issues and explains the remedial measures taken by means ... more This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here zigzag transformer is used as the current injection device so that the advantages pertaining to the zigzag transformer is effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the DC-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results.

2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

2022 IEEE 2nd International Conference on Sustainable Energy and Future Electric Transportation (SeFeT)

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

High power industrial loads are often fed from front-end multi-pulse rectifier as its ability to ... more High power industrial loads are often fed from front-end multi-pulse rectifier as its ability to effectively and inexpensively mitigate the harmonics on the AC side is achieved by the multi-pulse autoconfigured transformer. This paper analyzes and investigates the operability of the zigzag autoconfigured transformer based 12-pulse rectifier when one of the input terminals is open, i.e., single-phasing. Contrary to the prior art multi-pulse rectifiers, the availability of neutral point in zigzag autoconfigured transformer results in normal operation at DC side during single-phasing. A detailed MATLAB Simulation is carried out to understand the single-phasing operation of the zigzag autoconfigured transformer. Further, the experimental results from the laboratory prototype are presented to validate the simulated results.

2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), 2017

This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) ... more This paper discusses the solar photovoltaic (SPV) array fed switched mode power converter (SMPC) using a modular full-bridge dc-dc converter as an intermediate converter. Among the different types of dc-dc converters, the straightforward and uncomplicated boost converter is selected in order to obtain the maximal power from the SPV array. The straightforward boost converter with reduced part count has inherent features of minimizing the output current ripples and possessing an unbounded region for maximum power point extraction. The improved efficiency of the converter is achieved by designing the SPV array to deliver maximum power at rated dc voltage and maximum switch utilization of the boost converter. The design, analysis and operating modes are explained for the proposed converter and the performance is validated through MATLAB/Simulink based simulation.

2016 First International Conference on Sustainable Green Buildings and Communities (SGBC), 2016

In this paper a front-end converter having third harmonic current injection technique is used for... more In this paper a front-end converter having third harmonic current injection technique is used for improving input current shape as near sinusoidal. Here zig-zag transformer is used as the current injection device so that the advantages pertaining to zig-zag transformer is utilized effectively. The third harmonic current injection device along with the three-level boost converter at the output stage will increase the dc-link voltage and the current is injected through zig-zag transformer. The power quality is well improved using third harmonic current modulated front-end structure which is very well applicable to telecom load having the high current low voltage. Extensive simulation is carried out for the 12 kW load and the results are verified through experimental setup. The experimental setup is tested for reduced voltage rating and the test results are presented.