Sarsing Gao | North Eastern Regional Institute of Science and Technology (original) (raw)
Papers by Sarsing Gao
2020 International Conference on Electrical and Electronics Engineering (ICE3)
This paper proposes two different techniques to optimize the harmonic content in 15-level cascade... more This paper proposes two different techniques to optimize the harmonic content in 15-level cascaded H-bridge multi-level inverter (MLI). The proposed techniques are used to determine the switching angle for cascaded H-bridge MLI by solving the non-linear equation using Genetic algorithm (GA) and Newton Raphson (NR) method. Operation for medium voltage and High power converter requires a high-quality waveform with low switching loss. The quality of waveform depends on the number of voltage levels. Higher the voltage level, less will be the harmonics content of different orders. Dominant orders of harmonics have more deteriorating effect in the output wave shape of the inverter. If they are reduced, it will improve the nature of the wave shape. This may be done by applying selective harmonics elimination (SHE) technique. Genetic Algorithm (GA) and Newton-Raphson (NR) techniques have been used in SHE for generating switching pulses for a cascaded multilevel inverter. The simulated results have been presented in this paper indicating the elimination of dominant order of harmonics.
This paper analyzes the feasibility of generating electricity at a remote area from a micro hydro... more This paper analyzes the feasibility of generating electricity at a remote area from a micro hydro power plant (MHPP) having two units of three phase Capacitor excited Asynchronous Generators (CAGs) operating in parallel. The study is carried out considering different variable turbine inputs for both the units. The proposed (MHPP) utilizes PWM based AC-DC-AC converter to provide constant frequency and voltage. The design of control algorithms for the converter is accomplished such that the power quality issues are resolved. The passive filters are also incorporated in the circuit to reduce the harmonics in the system. The simulation is carried out in MATLAB/Simulink and the results are discussed.
2018 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), 2018
This paper presents performance analysis of a PWM based AC-DC-AC converter implemented for a thre... more This paper presents performance analysis of a PWM based AC-DC-AC converter implemented for a three phase self-excited induction generator (SEIG)based micro hydro power generation. In this work, the feasibility study of generating and supplying reliable power from freely flowing water to a remote area is presented. The power generation with variable water flow to the turbine is found to be feasible with satisfactory power qualities at different loading conditions of the generator. Investigations on power quality issues are carried out for both linear and non-linear types of loads. The proposed system is modeled in MATLAB/Simulink environment. The simulation results are presented.
2019 Research, Invention, and Innovation Congress (RI2C)
This paper presents a new micro hydro power generation scheme using capacitor excited asynchronou... more This paper presents a new micro hydro power generation scheme using capacitor excited asynchronous generator and back to back converter. The scheme also considers variable turbine which rotates the generator at variable speed to generate variable AC voltage. The use of AC-DC-AC converter helps to convert the variable AC to DC and then to constant AC voltage and frequency. The design of control algorithms of the converter is based on the decoupled d-q control theory. The performance of the proposed scheme is analysed under resistive and inductive loads. The proposed model also has a D-STATCOM for regulating the output voltage at constant peak voltage during loading. The control principle of the D-STATCOM is based on a modified SRF theory and it has the ability to compensate unbalanced load current and load harmonics apart from regulating load voltage. The simulation is carried out with the help of MATLAB/Simulink and the power quality issues are also studied. The results show satisfactory performance of the proposed scheme.
2018 5th IEEE Uttar Pradesh Section International Conference on Electrical, Electronics and Computer Engineering (UPCON), 2018
In today's world, when there is crisis of conventional energy resources, it has become essent... more In today's world, when there is crisis of conventional energy resources, it has become essential to harness energy from non-conventional energy resources. However, the electrical energy obtained through renewable sources is mostly variable or in the form of direct current. The output voltage obtained from solar or wind needs to be converted through either ac-dc-ac or dc-ac converters. The utility grid compatible ac output from these sources can only be applied to home appliances and electrical drives. Thus, an inverter is an indispensable device in the present energy scenario. In the design of inverter, gate pulse generation plays a vital role. There are several techniques available to generate gate pulses. Some of the techniques are space vector modulation (SVM) and sinusoidal pulse width modulation (SPWM) which could be used not only for two-level inverters but multilevel inverters as well. Because of ease, a two-level inverter is used for low voltage and low power application...
2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020), 2020
A new architecture of AC-DC-AC converter is proposed for a Capacitor Excited Asynchronous Generat... more A new architecture of AC-DC-AC converter is proposed for a Capacitor Excited Asynchronous Generators (CAGs) based micro hydro power generation scheme for supplying loads at remote areas. The new scheme uses two CAGs operating at variable speeds fed by two different variable turbines. The proposed converter architecture manages the variable inputs by converting the each of the generated variable voltages to dc voltage at a common dc bus. It has a common Voltage Source Inverter (VSI) to provide constant voltage and frequency at the load end. This scheme has eliminated the problem of synchronization of two variable sources at lesser cost compared to that of individual back to back converters. The proposed scheme is studied and analysed to assess the feasibility in terms of its performance and quality of power under different loads such as resistive and inductive load. The modeling and the simulation are performed in MATLAB/Simulink and the results are presented.
2014 Eighteenth National Power Systems Conference (NPSC), 2014
ABSTRACT This paper presents modeling and power quality analysis of an integrated renewable energ... more ABSTRACT This paper presents modeling and power quality analysis of an integrated renewable energy system (RES) aimed at supplying electrical power to communities residing at remote locations, far from the grid supply. A decentralized power generation in the form of integrated system is proposed comprising of a solar photovoltaic (PV) system, a wind energy system (WES) and a micro hydro system (MHS) to supply required electric loads. The PV system is modeled with a dc-dc converter for regulating dc output voltage; a maximum power point tracking system (MPPT) is incorporated in order to achieve a reliable power output. The WES is modeled with a variable speed wind-turbine set with fixed pitch angle and the set drives a capacitor excited asynchronous generator (CAG). The CAG, in turn, is modeled with a closed loop turbine input system to account for the drooping characteristics of the asynchronous generator. The MHS consists of a constant power CAG. The three different sources are integrated and connected to a common ac bus and the performances of the system under varying loads are presented. A static synchronous compensator (STATCOM) is proposed in this work for reactive power compensation which, in turn, is expected to improve the power quality of the integrated system. The STATCOM is realized by means of a three-phase IGBT based current controlled voltage source inverter (CC-VSI) with a self-supporting dc bus. The complete system is modeled and simulated using Matlab/Simulink. The results obtained are presented and they are found to be satisfactory. Keywords—Renewable energy system; maximum power point tracking; boost converter; solar photovoltaic; wind energy; capacitor excited asynchronous generator; STATCOM
AIMS Energy, 2020
India is a developing nation with 1.35 billion populations living in varied strata of living stan... more India is a developing nation with 1.35 billion populations living in varied strata of living standards. Therefore, the energy demand is constantly increasing in an effort to accelerate industrial activities and boost the economy. The country mostly meets its electricity demand from fossil fuel. It has large generation capacity but in some remote and rural areas only 53% of the villages get electric supply for less than 12 hours a day. This is because of hilly and mountainous terrains especially in the north and north-eastern regions of the country and absence of utility grid owing to economic reasons. It is estimated that about 15% of country’s population do not have access to electricity. With huge hydro potential in the country, especially in the Himalayan States, hydropower generation may be emphasized and pressed in to augment ever increasing energy demand. The emphasis should be on small hydropower (SHP) as construction of large hydropower involves huge capital cost and they are associated with various techno-economic and social issues. The article aims to provide important information for appropriate policy making in developing small hydropower in India.
2018 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), 2018
In this work, small distributed power generators of renewable energy sources are connected to the... more In this work, small distributed power generators of renewable energy sources are connected to the distribution grid with nonlinear/dynamic loads. The effect on the power quality of the proposed system is analyzed via dynamic voltage restorer (DVR). The distributed generators (DGs) are integrated and fed to distribution grid through de link of DVR interfacing inverter which is a series inverter linking the DGs to the distribution grid. The DGs as energy storage device regulates the dc link voltage of DVR. The distributed generator consisting of a photovoltaic system (PVS), a wind energy conversion system (WECS) and a micro hydro system (MHS) is proposed. The motivation is on improvement of power quality (PQ) in terms of harmonics and voltage sag. An instantaneous symmetrical component theory (ISCT) for fundamental voltage extraction and hysteresis current control technique for PWM generation is implemented. The complete system is modeled using MATLAB/Simulink SimPower system block set. The proposed system is subjected to nonlinear and dynamic loads and the simulated results are presented. The total harmonic distortion (THD) is shown to analyze the harmonic content in load voltage. The performances of the DVR are found to be tolerant under various load perturbations.
PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY, 2020
2020 IEEE 17th India Council International Conference (INDICON), 2020
Renewable distributed generators (DG) is employed to the DC link of DSTATCOM for mitigating the p... more Renewable distributed generators (DG) is employed to the DC link of DSTATCOM for mitigating the power quality (PQ) issues of nonlinear load connected to low voltage distribution network (LVDN). The DG consists of a photovoltaic system (PVS), wind energy conversion system (WECS) and micro hydro system (MHS) integrated to a DC bus through power electronic interfacing. Hence, DSTATCOM incorporates the features of interfacing inverter as well as mitigates the current harmonics generated by the non-linear load. The DSTATCOM control based on p-q theory (PQT) is implemented and to ensure its effectiveness, harmonics distortion is analyzed. The total harmonic distortion (THD) of the point of common coupling (PCC) voltage and current are computed as well as the individual harmonic distortion is highlighted to give further insight. The harmonic distortion limits as per IEEE std. 519-2014 is followed. The complete system is modeled and simulated in Matlab/Simulink environment.
International Journal of Renewable Energy Research, 2020
A new micro hydro power generation (MHPG) scheme is proposed for supplying loads located at rem... more A new micro hydro power generation (MHPG) scheme is proposed for supplying loads located at remote areas far away from grid. This paper presents three major contributions for small scale renewable hydro power generation technology. Firstly, the proposed model uses unregulated flow rates for two different generators for generating small scale hydroelectricity which otherwise generally uses constant flow rates. Secondly, a new architecture of converter is designed and implemented for parallel operation of two variable speed generators. Thirdly, a fuzzy PI based converter control is designed for the proposed MHPG system, which is found to perform better than that of conventional PI control based systems. In this, a new architecture of AC-DC-AC converter is used for controlling two parallel operated variable speed Capacitor Excited Asynchronous Generators (CAGs). The two CAGs are considered to be operated at variable speeds as fed by two different variable turbines. The converter syst...
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
The paper focuses on possibility of integrating different renewable energy sources (RES) and how ... more The paper focuses on possibility of integrating different renewable energy sources (RES) and how the integrated system could be effectively utilized to supply power to remote and far-flung areas where grid connection is challenging and power demand is nominal. A detailed modeling of solar photovoltaic (SPV) system, a wind energy system (WES) and a micro hydro system (MHS) and their integration and eventual connection to a common AC bus feeding power to three-phase load is presented. Along with maximum power point tracking (MPPT) system, the SPV system has a DC-DC converter to obtain a regulated DC output. The voltage source inverter (VSI) performs DC-AC conversion, the AC output being smoothen by means of an LC filter. The WES consists offixed pitch angle and a variable speed wind turbine model which acts as prime mover to a capacitor excited asynchronous generator (CAG) meant for generating the rated voltage. Similarly the MHS is modeled with a CAG assuming a constant input power. ...
1 Abstract: An hybrid renewable energy sources consisting of solar photovoltaic, wind energy syst... more 1 Abstract: An hybrid renewable energy sources consisting of solar photovoltaic, wind energy system, and a microhydro system is proposed in this paper. This system is suitable for supplying electricity to isolated locations or remote villages far from the grid supply. The solar photovoltaic system is modeled with two power converters, the first one being a DC-DC converter along with an maximum power point tracking to achieve a regulated DC output voltage and the second one being a DC-AC converter to obtain AC output. The wind energy system is modeled with a wind-turbine prime mover with varying wind speed and fixed pitch angle to drive an self excited induction generator (SEIG). Owing to inherent drooping characteristics of the SEIG, a closed loop turbine input system is incorporated. The microhydro system is modeled with a constant input power to drive an SEIG. The three different sources are integrated through an AC bus and the proposed hybrid system is supplied to R, R-L, and ind...
2019 IEEE International Conference on Sustainable Energy Technologies (ICSET), 2019
Growth of a nation depends on the optimum utilization of energy, especially electrical energy, as... more Growth of a nation depends on the optimum utilization of energy, especially electrical energy, as all the industries, directly or indirectly, need electrical source which is mostly obtain through conventional sources of energy. These sources are limited which are likely to vanish in near future. This has forced harnessing of electrical energy from non-conventional energy resources. The electrical energy obtain through these sources are direct current but most of the electrical drives need alternating current for its operation hence an alternating current at fundamental frequency and magnitude could be achieve through inverter. It acts not only as back-up for drives systems but also as standby supply at domestic levels. An inverter contains controllable power electronic devices which could be switched on and off thereby leading to generation of harmonics, especially dominant orders of harmonics have their effect in form of generating heat within the inverter and also in other power system components. Hence, they need to eliminate. One among many techniques could be Selective harmonic elimination PWM (SHE-PWM). In this paper, a multi-level Cascaded H-bridge inverter has been proposed. The optimized switching angles have been generated through Genetic Algorithm optimization tool by solving nonlinear equations. The simulated result shows that harmonics order, up to 17th order, have been reduced in no load output voltage. This waveform could be smoothened using low pass filter and intern applied to different types of load.
Sustainable Cities and Society, 2021
Green Engineering and Technology, 2021
2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021
Harmonic analysis and reporting in distribution power system to improve power quality has been ex... more Harmonic analysis and reporting in distribution power system to improve power quality has been experiencing exponential growth in future grid power quality issues. A large number of power quality metering instruments, penetration of many non-linear loads and integration of distributed generation (DG) provide a large amount of data for both current and voltage harmonics which are convenient for investigating power quality problems. The main objective of this paper is to develop a new method of reporting broad range of harmonic order performance data measure at different individual location of load without omitting significant information. This topology will help in reporting large amount of individual harmonic order detail to a simple harmonic spectrum. Lastly, a MATLAB/Simulink model for the IEEE 9-bus distribution system is investigated to implement the proposed methodology using raw data for analysis and reporting.
International Journal of Power and Energy Conversion, 2021
2020 International Conference on Electrical and Electronics Engineering (ICE3)
This paper proposes two different techniques to optimize the harmonic content in 15-level cascade... more This paper proposes two different techniques to optimize the harmonic content in 15-level cascaded H-bridge multi-level inverter (MLI). The proposed techniques are used to determine the switching angle for cascaded H-bridge MLI by solving the non-linear equation using Genetic algorithm (GA) and Newton Raphson (NR) method. Operation for medium voltage and High power converter requires a high-quality waveform with low switching loss. The quality of waveform depends on the number of voltage levels. Higher the voltage level, less will be the harmonics content of different orders. Dominant orders of harmonics have more deteriorating effect in the output wave shape of the inverter. If they are reduced, it will improve the nature of the wave shape. This may be done by applying selective harmonics elimination (SHE) technique. Genetic Algorithm (GA) and Newton-Raphson (NR) techniques have been used in SHE for generating switching pulses for a cascaded multilevel inverter. The simulated results have been presented in this paper indicating the elimination of dominant order of harmonics.
This paper analyzes the feasibility of generating electricity at a remote area from a micro hydro... more This paper analyzes the feasibility of generating electricity at a remote area from a micro hydro power plant (MHPP) having two units of three phase Capacitor excited Asynchronous Generators (CAGs) operating in parallel. The study is carried out considering different variable turbine inputs for both the units. The proposed (MHPP) utilizes PWM based AC-DC-AC converter to provide constant frequency and voltage. The design of control algorithms for the converter is accomplished such that the power quality issues are resolved. The passive filters are also incorporated in the circuit to reduce the harmonics in the system. The simulation is carried out in MATLAB/Simulink and the results are discussed.
2018 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), 2018
This paper presents performance analysis of a PWM based AC-DC-AC converter implemented for a thre... more This paper presents performance analysis of a PWM based AC-DC-AC converter implemented for a three phase self-excited induction generator (SEIG)based micro hydro power generation. In this work, the feasibility study of generating and supplying reliable power from freely flowing water to a remote area is presented. The power generation with variable water flow to the turbine is found to be feasible with satisfactory power qualities at different loading conditions of the generator. Investigations on power quality issues are carried out for both linear and non-linear types of loads. The proposed system is modeled in MATLAB/Simulink environment. The simulation results are presented.
2019 Research, Invention, and Innovation Congress (RI2C)
This paper presents a new micro hydro power generation scheme using capacitor excited asynchronou... more This paper presents a new micro hydro power generation scheme using capacitor excited asynchronous generator and back to back converter. The scheme also considers variable turbine which rotates the generator at variable speed to generate variable AC voltage. The use of AC-DC-AC converter helps to convert the variable AC to DC and then to constant AC voltage and frequency. The design of control algorithms of the converter is based on the decoupled d-q control theory. The performance of the proposed scheme is analysed under resistive and inductive loads. The proposed model also has a D-STATCOM for regulating the output voltage at constant peak voltage during loading. The control principle of the D-STATCOM is based on a modified SRF theory and it has the ability to compensate unbalanced load current and load harmonics apart from regulating load voltage. The simulation is carried out with the help of MATLAB/Simulink and the power quality issues are also studied. The results show satisfactory performance of the proposed scheme.
2018 5th IEEE Uttar Pradesh Section International Conference on Electrical, Electronics and Computer Engineering (UPCON), 2018
In today's world, when there is crisis of conventional energy resources, it has become essent... more In today's world, when there is crisis of conventional energy resources, it has become essential to harness energy from non-conventional energy resources. However, the electrical energy obtained through renewable sources is mostly variable or in the form of direct current. The output voltage obtained from solar or wind needs to be converted through either ac-dc-ac or dc-ac converters. The utility grid compatible ac output from these sources can only be applied to home appliances and electrical drives. Thus, an inverter is an indispensable device in the present energy scenario. In the design of inverter, gate pulse generation plays a vital role. There are several techniques available to generate gate pulses. Some of the techniques are space vector modulation (SVM) and sinusoidal pulse width modulation (SPWM) which could be used not only for two-level inverters but multilevel inverters as well. Because of ease, a two-level inverter is used for low voltage and low power application...
2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020), 2020
A new architecture of AC-DC-AC converter is proposed for a Capacitor Excited Asynchronous Generat... more A new architecture of AC-DC-AC converter is proposed for a Capacitor Excited Asynchronous Generators (CAGs) based micro hydro power generation scheme for supplying loads at remote areas. The new scheme uses two CAGs operating at variable speeds fed by two different variable turbines. The proposed converter architecture manages the variable inputs by converting the each of the generated variable voltages to dc voltage at a common dc bus. It has a common Voltage Source Inverter (VSI) to provide constant voltage and frequency at the load end. This scheme has eliminated the problem of synchronization of two variable sources at lesser cost compared to that of individual back to back converters. The proposed scheme is studied and analysed to assess the feasibility in terms of its performance and quality of power under different loads such as resistive and inductive load. The modeling and the simulation are performed in MATLAB/Simulink and the results are presented.
2014 Eighteenth National Power Systems Conference (NPSC), 2014
ABSTRACT This paper presents modeling and power quality analysis of an integrated renewable energ... more ABSTRACT This paper presents modeling and power quality analysis of an integrated renewable energy system (RES) aimed at supplying electrical power to communities residing at remote locations, far from the grid supply. A decentralized power generation in the form of integrated system is proposed comprising of a solar photovoltaic (PV) system, a wind energy system (WES) and a micro hydro system (MHS) to supply required electric loads. The PV system is modeled with a dc-dc converter for regulating dc output voltage; a maximum power point tracking system (MPPT) is incorporated in order to achieve a reliable power output. The WES is modeled with a variable speed wind-turbine set with fixed pitch angle and the set drives a capacitor excited asynchronous generator (CAG). The CAG, in turn, is modeled with a closed loop turbine input system to account for the drooping characteristics of the asynchronous generator. The MHS consists of a constant power CAG. The three different sources are integrated and connected to a common ac bus and the performances of the system under varying loads are presented. A static synchronous compensator (STATCOM) is proposed in this work for reactive power compensation which, in turn, is expected to improve the power quality of the integrated system. The STATCOM is realized by means of a three-phase IGBT based current controlled voltage source inverter (CC-VSI) with a self-supporting dc bus. The complete system is modeled and simulated using Matlab/Simulink. The results obtained are presented and they are found to be satisfactory. Keywords—Renewable energy system; maximum power point tracking; boost converter; solar photovoltaic; wind energy; capacitor excited asynchronous generator; STATCOM
AIMS Energy, 2020
India is a developing nation with 1.35 billion populations living in varied strata of living stan... more India is a developing nation with 1.35 billion populations living in varied strata of living standards. Therefore, the energy demand is constantly increasing in an effort to accelerate industrial activities and boost the economy. The country mostly meets its electricity demand from fossil fuel. It has large generation capacity but in some remote and rural areas only 53% of the villages get electric supply for less than 12 hours a day. This is because of hilly and mountainous terrains especially in the north and north-eastern regions of the country and absence of utility grid owing to economic reasons. It is estimated that about 15% of country’s population do not have access to electricity. With huge hydro potential in the country, especially in the Himalayan States, hydropower generation may be emphasized and pressed in to augment ever increasing energy demand. The emphasis should be on small hydropower (SHP) as construction of large hydropower involves huge capital cost and they are associated with various techno-economic and social issues. The article aims to provide important information for appropriate policy making in developing small hydropower in India.
2018 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), 2018
In this work, small distributed power generators of renewable energy sources are connected to the... more In this work, small distributed power generators of renewable energy sources are connected to the distribution grid with nonlinear/dynamic loads. The effect on the power quality of the proposed system is analyzed via dynamic voltage restorer (DVR). The distributed generators (DGs) are integrated and fed to distribution grid through de link of DVR interfacing inverter which is a series inverter linking the DGs to the distribution grid. The DGs as energy storage device regulates the dc link voltage of DVR. The distributed generator consisting of a photovoltaic system (PVS), a wind energy conversion system (WECS) and a micro hydro system (MHS) is proposed. The motivation is on improvement of power quality (PQ) in terms of harmonics and voltage sag. An instantaneous symmetrical component theory (ISCT) for fundamental voltage extraction and hysteresis current control technique for PWM generation is implemented. The complete system is modeled using MATLAB/Simulink SimPower system block set. The proposed system is subjected to nonlinear and dynamic loads and the simulated results are presented. The total harmonic distortion (THD) is shown to analyze the harmonic content in load voltage. The performances of the DVR are found to be tolerant under various load perturbations.
PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY, 2020
2020 IEEE 17th India Council International Conference (INDICON), 2020
Renewable distributed generators (DG) is employed to the DC link of DSTATCOM for mitigating the p... more Renewable distributed generators (DG) is employed to the DC link of DSTATCOM for mitigating the power quality (PQ) issues of nonlinear load connected to low voltage distribution network (LVDN). The DG consists of a photovoltaic system (PVS), wind energy conversion system (WECS) and micro hydro system (MHS) integrated to a DC bus through power electronic interfacing. Hence, DSTATCOM incorporates the features of interfacing inverter as well as mitigates the current harmonics generated by the non-linear load. The DSTATCOM control based on p-q theory (PQT) is implemented and to ensure its effectiveness, harmonics distortion is analyzed. The total harmonic distortion (THD) of the point of common coupling (PCC) voltage and current are computed as well as the individual harmonic distortion is highlighted to give further insight. The harmonic distortion limits as per IEEE std. 519-2014 is followed. The complete system is modeled and simulated in Matlab/Simulink environment.
International Journal of Renewable Energy Research, 2020
A new micro hydro power generation (MHPG) scheme is proposed for supplying loads located at rem... more A new micro hydro power generation (MHPG) scheme is proposed for supplying loads located at remote areas far away from grid. This paper presents three major contributions for small scale renewable hydro power generation technology. Firstly, the proposed model uses unregulated flow rates for two different generators for generating small scale hydroelectricity which otherwise generally uses constant flow rates. Secondly, a new architecture of converter is designed and implemented for parallel operation of two variable speed generators. Thirdly, a fuzzy PI based converter control is designed for the proposed MHPG system, which is found to perform better than that of conventional PI control based systems. In this, a new architecture of AC-DC-AC converter is used for controlling two parallel operated variable speed Capacitor Excited Asynchronous Generators (CAGs). The two CAGs are considered to be operated at variable speeds as fed by two different variable turbines. The converter syst...
2015 International Conference on Energy, Power and Environment: Towards Sustainable Growth (ICEPE), 2015
The paper focuses on possibility of integrating different renewable energy sources (RES) and how ... more The paper focuses on possibility of integrating different renewable energy sources (RES) and how the integrated system could be effectively utilized to supply power to remote and far-flung areas where grid connection is challenging and power demand is nominal. A detailed modeling of solar photovoltaic (SPV) system, a wind energy system (WES) and a micro hydro system (MHS) and their integration and eventual connection to a common AC bus feeding power to three-phase load is presented. Along with maximum power point tracking (MPPT) system, the SPV system has a DC-DC converter to obtain a regulated DC output. The voltage source inverter (VSI) performs DC-AC conversion, the AC output being smoothen by means of an LC filter. The WES consists offixed pitch angle and a variable speed wind turbine model which acts as prime mover to a capacitor excited asynchronous generator (CAG) meant for generating the rated voltage. Similarly the MHS is modeled with a CAG assuming a constant input power. ...
1 Abstract: An hybrid renewable energy sources consisting of solar photovoltaic, wind energy syst... more 1 Abstract: An hybrid renewable energy sources consisting of solar photovoltaic, wind energy system, and a microhydro system is proposed in this paper. This system is suitable for supplying electricity to isolated locations or remote villages far from the grid supply. The solar photovoltaic system is modeled with two power converters, the first one being a DC-DC converter along with an maximum power point tracking to achieve a regulated DC output voltage and the second one being a DC-AC converter to obtain AC output. The wind energy system is modeled with a wind-turbine prime mover with varying wind speed and fixed pitch angle to drive an self excited induction generator (SEIG). Owing to inherent drooping characteristics of the SEIG, a closed loop turbine input system is incorporated. The microhydro system is modeled with a constant input power to drive an SEIG. The three different sources are integrated through an AC bus and the proposed hybrid system is supplied to R, R-L, and ind...
2019 IEEE International Conference on Sustainable Energy Technologies (ICSET), 2019
Growth of a nation depends on the optimum utilization of energy, especially electrical energy, as... more Growth of a nation depends on the optimum utilization of energy, especially electrical energy, as all the industries, directly or indirectly, need electrical source which is mostly obtain through conventional sources of energy. These sources are limited which are likely to vanish in near future. This has forced harnessing of electrical energy from non-conventional energy resources. The electrical energy obtain through these sources are direct current but most of the electrical drives need alternating current for its operation hence an alternating current at fundamental frequency and magnitude could be achieve through inverter. It acts not only as back-up for drives systems but also as standby supply at domestic levels. An inverter contains controllable power electronic devices which could be switched on and off thereby leading to generation of harmonics, especially dominant orders of harmonics have their effect in form of generating heat within the inverter and also in other power system components. Hence, they need to eliminate. One among many techniques could be Selective harmonic elimination PWM (SHE-PWM). In this paper, a multi-level Cascaded H-bridge inverter has been proposed. The optimized switching angles have been generated through Genetic Algorithm optimization tool by solving nonlinear equations. The simulated result shows that harmonics order, up to 17th order, have been reduced in no load output voltage. This waveform could be smoothened using low pass filter and intern applied to different types of load.
Sustainable Cities and Society, 2021
Green Engineering and Technology, 2021
2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021
Harmonic analysis and reporting in distribution power system to improve power quality has been ex... more Harmonic analysis and reporting in distribution power system to improve power quality has been experiencing exponential growth in future grid power quality issues. A large number of power quality metering instruments, penetration of many non-linear loads and integration of distributed generation (DG) provide a large amount of data for both current and voltage harmonics which are convenient for investigating power quality problems. The main objective of this paper is to develop a new method of reporting broad range of harmonic order performance data measure at different individual location of load without omitting significant information. This topology will help in reporting large amount of individual harmonic order detail to a simple harmonic spectrum. Lastly, a MATLAB/Simulink model for the IEEE 9-bus distribution system is investigated to implement the proposed methodology using raw data for analysis and reporting.
International Journal of Power and Energy Conversion, 2021