Amit Ojha | Maulana Azad National Institute of Technology (original) (raw)

Papers by Amit Ojha

Neural Computing and Applications

International Journal of Recent Technology and Engineering (IJRTE), 2019

Permanent magnet synchronous motors (PMSM) are gaining popularity day by day and will rule in the... more Permanent magnet synchronous motors (PMSM) are gaining popularity day by day and will rule in the next decade as these motors have several benefits over induction motor such more efficiency, low noise operation, reduced size, and maintenance free operation. These motors require a position sensor for its control, which makes it costlier, increase the size and low reliability. The development of fast microcontroller, IGBT devices, and high density permanent materials has opened the gate of industrial and commercial market for PM Synchronous Machine. The researchers from various corners of the world are working hard from more than two decades to evolve the sensorless control scheme for rotor flux estimation. A sensorless control schemes proposed till date works satisfactory, but, high performance is still a challenge. The paper presents a review of most popular robust SMO technique for position sensorless control of PM-Synchronous Motor with its benefits & drawbacks.

Lecture Notes in Mechanical Engineering, 2021

Environment protection in Metro cities is a growing concern. Automobile sector play a very import... more Environment protection in Metro cities is a growing concern. Automobile sector play a very important role in the vision of green friendly environment. Continual reduction of reserve of fossil fuel and increased level of pollution has further forced to think of alternative is an electric vehicle. Mission 2030 for Government of India-"All vehicle will be Electric Vehicle" has given a boost to the E-vehicle and it will lead to generate cumulative savings of 846 million tons of CO2 over the total deployed vehicle's lifetime. Many corporates have already jumped to this sector as it is future of automobile sector. Now, electric vehicle is a reality and available for local public transportation. This paper covers an overview of the present status of electric vehicles in India with respect to technological growth. Key challenges faced by electric vehicle are also discussed.

Mechatronic Systems and Control, 2021

Springer Proceedings in Energy, 2021

performance analysis of BLDC Motor is presented. The mathematical model of the BLDC motor is deve... more performance analysis of BLDC Motor is presented. The mathematical model of the BLDC motor is developed and it is used to examine the performance of the controllers. Initially a PI controller is developed for the speed control of the given BLDC motor. Then a fuzzy logic based controller is developed. Through extensive simulations it is observed that the performance of fuzzy logic controller is slightly better than PI controller.

Abstract— Multilevel inverters have gained importance in medium voltage and high power drives app... more Abstract— Multilevel inverters have gained importance in medium voltage and high power drives applications due to superior performance over two level inverters such as lower harmonics, less voltage stress, better harmonic profile, reduced dv/dt stress, produce lower common mode voltage etc., This paper focuses on implementation of Space Vector Pulse Width Modulation (SVPWM) Technique for Three level Neutral Point Clamped (NPC) Multilevel Inverter fed Induction Motor and compare it with Sinusoidal Pulse Width Modulation Technique (SPWM). The SVPWM scheme implemented in this paper generates all the available switching states sequences and evaluates duty cycles like two level inverter. Since all the switching states and sequences are obtained by simple calculations, look up tables are not required and scheme is computationally fast. The simulation has been done in MATLAB Simulink environment and simulation results are verified through OPAL-RT OP4500 Real Time Simulator.

Lecture Notes in Mechanical Engineering, 2021

2020 International Conference on Computational Intelligence for Smart Power System and Sustainable Energy (CISPSSE), 2020

This paper discusses types of feedback control used in variable source fed Boost converter. The p... more This paper discusses types of feedback control used in variable source fed Boost converter. The power controller plays an important role in the field of renewable energy platform. Mainly used feedback controllers are Fuzzy logic controller, conventional PI control and duty function by using MATLAB/SIMULINK along with output are also provided. The comparison between three closed-loop controls are also explained and gives the detailed relations of all controlled that mentioned.

For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel conver... more For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel converters are becoming a good choice. In this paper the performance of a 3-phase neutral point clamped Active Front End three level converter for high power application with simplified control scheme is presented. A complete mathematical model of the control scheme is developed and performance is investigated for balanced load in terms of voltage unbalance across dc link, voltage stress across the switches and THD in the line current.

Lecture Notes in Mechanical Engineering, 2021

2021 International Conference on Sustainable Energy and Future Electric Transportation (SEFET), 2021

In this paper a 3.25 mathrmkWmathrmP\mathrm{kW}_{\mathrm{P}}mathrmkWmathrmP grid connected single stage solar photovoltaic sy... more In this paper a 3.25 mathrmkWmathrmP\mathrm{kW}_{\mathrm{P}}mathrmkWmathrmP grid connected single stage solar photovoltaic system with multilevel inverter and real time weather conditions is simulated on the MATLAB SIMULINK platform. DC-DC converter is completely avoided, voltage stabilization, maximum power point tracking and DC to AC conversion are done through only multilevel inverter. Five level multilevel inverter with five switches is developed and further to increase each two levels in the output voltage waveform only one more additional switch is to be added. The 1−Phi1-\Phi1−Phi multilevel inverter output is integrated with the 1−Phi1-\Phi1−Phi, 230V, 50 Hz supply from the grid. Shunt active current controller is designed to ensure that only real power flow exist in the system. The output voltage total harmonic distortion obtained is only 1.18% till 100mathrmtmathrmh100^{\mathrm{t}\mathrm{h}}100mathrmtmathrmh harmonic content, which is very less and multi carrier sinusoidal pulse width modulation control scheme is used to control inverter. The simulation results are validated with the practical per day energy generated through grid connected conventional inverter. Proposed work closely fits with practical data and better power quality is achieved.

The improvement in Battery Management System (BMS) change the face of electric powered vehicle. N... more The improvement in Battery Management System (BMS) change the face of electric powered vehicle. Nowadays most of the electric vehicle use CAN based communication in BMS unit. Future promise for electric vehicle is wireless communication in BMS that can reduce the complexity, costs, cable requirement for multi-cell pack and increase reliability. This paper deals with different wireless technology that can use in electric vehicle in future and gives a proper comparison between all the technologies.

2016 7th India International Conference on Power Electronics (IICPE), 2016

In past few years, with an increasing usage of power electronic devices in industries as well as ... more In past few years, with an increasing usage of power electronic devices in industries as well as distribution systems, the power quality is constantly depreciating. This paper investigation on mitigation of current harmonics, thereby improves power quality by using seven level cascaded multilevel converters based Shunt Active Power Filter (SAPF), which consists of transformer-less Multilevel Converter (MLC). The aim of this paper is development and analysis of SAPF for harmonics compensation in distribution system for power quality improvement. It also reduces weight and cost of the system. Instantaneous active and reactive power method (p-q theory) is adapted for generation of compensation active filter current where DC link voltage is regulated by PI controller. In order to generate gating signals, multi-carrier Alternate Phase Opposition Disposition (APOD) PWM scheme is used. The proposed CHB-MLC APF reduces the source current THD below 5%. The results are simulated using MATLAB/Simulink and demonstrates the effective mitigation of current harmonics with charge balancing APOD-PWM. The performance of proposed scheme has also been validated in Real-Time, using Opal-RT OP4500 simulator for non linear load and for high voltage distribution system.

Neural Computing and Applications

International Journal of Recent Technology and Engineering (IJRTE), 2019

Permanent magnet synchronous motors (PMSM) are gaining popularity day by day and will rule in the... more Permanent magnet synchronous motors (PMSM) are gaining popularity day by day and will rule in the next decade as these motors have several benefits over induction motor such more efficiency, low noise operation, reduced size, and maintenance free operation. These motors require a position sensor for its control, which makes it costlier, increase the size and low reliability. The development of fast microcontroller, IGBT devices, and high density permanent materials has opened the gate of industrial and commercial market for PM Synchronous Machine. The researchers from various corners of the world are working hard from more than two decades to evolve the sensorless control scheme for rotor flux estimation. A sensorless control schemes proposed till date works satisfactory, but, high performance is still a challenge. The paper presents a review of most popular robust SMO technique for position sensorless control of PM-Synchronous Motor with its benefits & drawbacks.

Lecture Notes in Mechanical Engineering, 2021

Environment protection in Metro cities is a growing concern. Automobile sector play a very import... more Environment protection in Metro cities is a growing concern. Automobile sector play a very important role in the vision of green friendly environment. Continual reduction of reserve of fossil fuel and increased level of pollution has further forced to think of alternative is an electric vehicle. Mission 2030 for Government of India-"All vehicle will be Electric Vehicle" has given a boost to the E-vehicle and it will lead to generate cumulative savings of 846 million tons of CO2 over the total deployed vehicle's lifetime. Many corporates have already jumped to this sector as it is future of automobile sector. Now, electric vehicle is a reality and available for local public transportation. This paper covers an overview of the present status of electric vehicles in India with respect to technological growth. Key challenges faced by electric vehicle are also discussed.

Mechatronic Systems and Control, 2021

Springer Proceedings in Energy, 2021

performance analysis of BLDC Motor is presented. The mathematical model of the BLDC motor is deve... more performance analysis of BLDC Motor is presented. The mathematical model of the BLDC motor is developed and it is used to examine the performance of the controllers. Initially a PI controller is developed for the speed control of the given BLDC motor. Then a fuzzy logic based controller is developed. Through extensive simulations it is observed that the performance of fuzzy logic controller is slightly better than PI controller.

Abstract— Multilevel inverters have gained importance in medium voltage and high power drives app... more Abstract— Multilevel inverters have gained importance in medium voltage and high power drives applications due to superior performance over two level inverters such as lower harmonics, less voltage stress, better harmonic profile, reduced dv/dt stress, produce lower common mode voltage etc., This paper focuses on implementation of Space Vector Pulse Width Modulation (SVPWM) Technique for Three level Neutral Point Clamped (NPC) Multilevel Inverter fed Induction Motor and compare it with Sinusoidal Pulse Width Modulation Technique (SPWM). The SVPWM scheme implemented in this paper generates all the available switching states sequences and evaluates duty cycles like two level inverter. Since all the switching states and sequences are obtained by simple calculations, look up tables are not required and scheme is computationally fast. The simulation has been done in MATLAB Simulink environment and simulation results are verified through OPAL-RT OP4500 Real Time Simulator.

Lecture Notes in Mechanical Engineering, 2021

2020 International Conference on Computational Intelligence for Smart Power System and Sustainable Energy (CISPSSE), 2020

This paper discusses types of feedback control used in variable source fed Boost converter. The p... more This paper discusses types of feedback control used in variable source fed Boost converter. The power controller plays an important role in the field of renewable energy platform. Mainly used feedback controllers are Fuzzy logic controller, conventional PI control and duty function by using MATLAB/SIMULINK along with output are also provided. The comparison between three closed-loop controls are also explained and gives the detailed relations of all controlled that mentioned.

For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel conver... more For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel converters are becoming a good choice. In this paper the performance of a 3-phase neutral point clamped Active Front End three level converter for high power application with simplified control scheme is presented. A complete mathematical model of the control scheme is developed and performance is investigated for balanced load in terms of voltage unbalance across dc link, voltage stress across the switches and THD in the line current.

Lecture Notes in Mechanical Engineering, 2021

2021 International Conference on Sustainable Energy and Future Electric Transportation (SEFET), 2021

In this paper a 3.25 mathrmkWmathrmP\mathrm{kW}_{\mathrm{P}}mathrmkWmathrmP grid connected single stage solar photovoltaic sy... more In this paper a 3.25 mathrmkWmathrmP\mathrm{kW}_{\mathrm{P}}mathrmkWmathrmP grid connected single stage solar photovoltaic system with multilevel inverter and real time weather conditions is simulated on the MATLAB SIMULINK platform. DC-DC converter is completely avoided, voltage stabilization, maximum power point tracking and DC to AC conversion are done through only multilevel inverter. Five level multilevel inverter with five switches is developed and further to increase each two levels in the output voltage waveform only one more additional switch is to be added. The 1−Phi1-\Phi1−Phi multilevel inverter output is integrated with the 1−Phi1-\Phi1−Phi, 230V, 50 Hz supply from the grid. Shunt active current controller is designed to ensure that only real power flow exist in the system. The output voltage total harmonic distortion obtained is only 1.18% till 100mathrmtmathrmh100^{\mathrm{t}\mathrm{h}}100mathrmtmathrmh harmonic content, which is very less and multi carrier sinusoidal pulse width modulation control scheme is used to control inverter. The simulation results are validated with the practical per day energy generated through grid connected conventional inverter. Proposed work closely fits with practical data and better power quality is achieved.

The improvement in Battery Management System (BMS) change the face of electric powered vehicle. N... more The improvement in Battery Management System (BMS) change the face of electric powered vehicle. Nowadays most of the electric vehicle use CAN based communication in BMS unit. Future promise for electric vehicle is wireless communication in BMS that can reduce the complexity, costs, cable requirement for multi-cell pack and increase reliability. This paper deals with different wireless technology that can use in electric vehicle in future and gives a proper comparison between all the technologies.

2016 7th India International Conference on Power Electronics (IICPE), 2016

In past few years, with an increasing usage of power electronic devices in industries as well as ... more In past few years, with an increasing usage of power electronic devices in industries as well as distribution systems, the power quality is constantly depreciating. This paper investigation on mitigation of current harmonics, thereby improves power quality by using seven level cascaded multilevel converters based Shunt Active Power Filter (SAPF), which consists of transformer-less Multilevel Converter (MLC). The aim of this paper is development and analysis of SAPF for harmonics compensation in distribution system for power quality improvement. It also reduces weight and cost of the system. Instantaneous active and reactive power method (p-q theory) is adapted for generation of compensation active filter current where DC link voltage is regulated by PI controller. In order to generate gating signals, multi-carrier Alternate Phase Opposition Disposition (APOD) PWM scheme is used. The proposed CHB-MLC APF reduces the source current THD below 5%. The results are simulated using MATLAB/Simulink and demonstrates the effective mitigation of current harmonics with charge balancing APOD-PWM. The performance of proposed scheme has also been validated in Real-Time, using Opal-RT OP4500 simulator for non linear load and for high voltage distribution system.