Adil Sarwar - Academia.edu (original) (raw)

Papers by Adil Sarwar

Energies

Reliability of the multilevel inverters (MLIs) is one of the most important concerns in industria... more Reliability of the multilevel inverters (MLIs) is one of the most important concerns in industrial applications, mainly due to the semiconductor devices. Whenever a fault occurs in one of the switches of the inverter, it leads to abnormal conditions and can also cause serious damage to the equipment connected to the multilevel inverter. In this paper, a recently proposed nine-level Packed-E-Cell (PEC) multilevel inverter topology is investigated for its fault-tolerant capability and improved reliability. The analysis is carried out for a reduced device multilevel inverter topology that, due to a lack of redundant states, cannot tolerate switch failures. The fault-tolerant (FT) topology provides additional redundant states in the switching sequence of the existing topology. The work in this paper presents Packed-E-Cell MLI modified for fault tolerance against single-switch open-circuit faults. The modified FT topology inherently achieves self-voltage balance in the DC-link capacitors...

Energies

Multilevel inverters are increasingly being employed for industrial applications, such as speed c... more Multilevel inverters are increasingly being employed for industrial applications, such as speed control of motors and grid integration of distributed generation systems. The focus is on developing topologies that utilize fewer lower-rating switches and power sources while working efficiently and reliably. This work pertains to developing a three-phase multilevel inverter that employs switching capacitors and a single DC power supply that produces a nine-stage, three-phase voltage output. A recently proposed powerful meta-heuristic technique called symbiotic organism search (SOS) has been applied to identify the optimum switching angles for Selective Harmonic Elimination (SHE) from the output voltage waveform. A thorough converter analysis has also been done in the MATLAB/SIMULINK environment and is validated with the real-time hardware-in-the-loop (HIL) experiment results.

Applied Sciences

In this paper, a new transformerless high voltage gain dc-dc converter is proposed for low and me... more In this paper, a new transformerless high voltage gain dc-dc converter is proposed for low and medium power application. The proposed converter has high quadratic gain and utilizes only two inductors to achieve this gain. It has two switches that are operated simultaneously, making control of the converter easy. The proposed converter’s output voltage gain is higher than the conventional quadratic boost converter and other recently proposed high gain quadratic converters. A voltage multiplier circuit (VMC) is integrated with the proposed converter, which significantly increases the converter’s output voltage. Apart from a high output voltage, the proposed converter has low voltage stress across switches and capacitors, which is a major advantage of the proposed topology. A hardware prototype of 200 W of the proposed converter is developed in the laboratory to validate the converter’s performance. The efficiency of the converter is obtained through PLECS software by incorporating the...

2019 International Conference on Electrical, Electronics and Computer Engineering (UPCON)

Solar PV systems are increasingly becoming an indispensable source of energy owing to their simpl... more Solar PV systems are increasingly becoming an indispensable source of energy owing to their simple construction, pollution free operation, and comparatively low operating costs. The solar PV systems provide an eco-friendly, cheap and almost omnipresent availability of energy throughout the world. Although, seemingly a very lucrative and easily available source of energy, these systems are not very widely implemented as Solar PV systems are not very efficient and major power losses occur. Due to clouds, skyscrapers in metropolitan cities, huge trees in rural areas etc. the sunlight is inhibited this leads to the sun rays striking the surface of the PV cell in an uneven fashion thereby leading to high power losses where the intensity of light is low and high power peaks where the intensity of light is high. Bypass diodes are employed to mitigate the effect of partial shading, but their application causes multiple peaks of power at the output. To track and determine the maximum power amongst all the available power peaks in this paper a Nature-Inspired algorithm (PSODTVAC) is employed. This algorithm is compared with other established algorithms like the gravitational search algorithm (GSA), Standard PSO (PSOSTD) and PSO with time varying acceleration (PSOTVAC) and it was observed that the proposed algorithm outperformed these existing algorithms.

International Journal of Emerging Electric Power Systems

Selective Harmonic Elimination PWM (SHEPWM) is a classical method of voltage control of the inver... more Selective Harmonic Elimination PWM (SHEPWM) is a classical method of voltage control of the inverter while eliminating the undesirable lower order harmonics for low-frequency applications. Multivariable non-linear equations often result in SHE modulation scheme. In this work, a Most Valuable Player Algorithm (MVPA) has been applied to solve the non-linear SHE equations for the elimination of lower order harmonics in a cascaded H bridge multilevel inverter. The MVPA algorithm shows better convergence characteristics and wider modulation control compared to some popular meta-heuristic optimization methods. Optimized switching angles have been obtained for 5, 7 and 9 level inverters for different modulation index (MI) from 0.05 to 1. The Total Harmonic Distortion (THD) for the output voltage was found to be smoother compared to the powerful Differential Evolution (DE) algorithm for modulation index greater than 0.6. And for modulation index greater than 0.8, MVPA scores better than DE ...

Electronics

There is a need for the optimal positioning of protective devices to maximize customers satisfact... more There is a need for the optimal positioning of protective devices to maximize customers satisfaction per their demands. Such arrangement advances the distribution system reliability to maximum achievable. Thus, radial distribution system (RDS) reliability can be improved by placing reclosers at suitable feeder sections. This article presents comprehensive details of an attempt to determine the reclosers’ optimal location in an RDS to maximize the utility profit by reliability improvement. Assessment of different reliability indices such as SAIDI, SAIFI, CAIFI, CAIDI, etc., with recloser placement, exhibits a considerable improvement in these indices in contrast with the absence of recloser. Consequently, a new bidirectional formulation has been proposed for the optimized arrangement of reclosers’. This formulation efficiently handles the bidirectional power flow, resulting from distributed generation (DG) unit (s) in the system. The proposed model has been solved for a test system b...

Energies, 2021

In this paper, we proposed a home energy management system (HEMS) that includes photovoltaic (PV)... more In this paper, we proposed a home energy management system (HEMS) that includes photovoltaic (PV), electric vehicle (EV), and energy storage systems (ESS). The proposed HEMS fully utilizes the PV power in operating domestic appliances and charging EV/ESS. The surplus power is fed back to the grid to achieve economic benefits. A novel charging and discharging scheme of EV/ESS is presented to minimize the energy cost, control the maximum load demand, increase the battery life, and satisfy the user’s-traveling needs. The EV/ESS charges during low pricing periods and discharges in high pricing periods. In the proposed method, a multi-objective problem is formulated, which simultaneously minimizes the energy cost, peak to average ratio (PAR), and customer dissatisfaction. The multi-objective optimization is solved using binary particle swarm optimization (BPSO). The results clearly show that it minimizes the operating cost from 402.89 cents to 191.46 cents, so that a reduction of 52.47% ...

Electronics, 2021

The design of a solar PV system and its performance evaluation is an important aspect before goin... more The design of a solar PV system and its performance evaluation is an important aspect before going for a mass-scale installation and integration with the grid. The parameter evaluation of a solar PV model helps in accurate modeling and consequently efficient designing of the system. The parameters appear in the mathematical equations of the solar PV cell. A Chaos Induced Coyote Algorithm (CICA) to obtain the parameters in a single, double, and three diode model of a mono-crystalline, polycrystalline, and a thin-film solar PV cell has been proposed in this work. The Chaos Induced Coyote Algorithm for extracting the parameters incorporates the advantages of the conventional Coyote Algorithm by employing only two control parameters, making it easier to include the unique strategy that balances the exploration and exploitation in the search space. A comparison of the Chaos Induced Coyote Algorithm with some recently proposed solar photovoltaic cell parameter extraction algorithms has be...

2018 IEEMA Engineer Infinite Conference (eTechNxT), 2018

Multilevel Inverters have shaped a new trend of importance in industry and research. A new topolo... more Multilevel Inverters have shaped a new trend of importance in industry and research. A new topology of multilevel inverter is proposed in this paper which can be operated in symmetrical and asymmetrical modes. The proposed topology produces 7-level and 13-level staircase output voltage waveform for symmetrical and asymmetrical configuration respectively using only 10 switches. The gate signals for the different switches are produced employing the fundamental frequency switching technique. The topology achieves better performance using a lower minimum number of components in comparison to conventional inverters. These improvements result in reduced system cost and size. Simulations are carried out using MATLAB/SIMULINK environment and experimental implementation using laboratory prototype module have ascertained the performance and operation of the proposed topology.

IEEE Transactions on Industry Applications, 2021

Multilevel inverters (MLI) are gaining wider popularity owing to their increasing power handling ... more Multilevel inverters (MLI) are gaining wider popularity owing to their increasing power handling capability and improving power quality output. With an inclining trend towards renewable energy utilization, they find a vital application in wind and solar power generation systems. This article proposes a new multilevel dc–ac inverter. The proposed MLI produces a twenty five level output and offers an inherent capacitor self-balancing capability. The inherent self-balancing eliminates the requirement of auxiliary sensor circuit or capacitors voltage balancing algorithms. Dual asymmetric voltage sources and switched capacitors along with their proper charging/discharging pattern are utilized for the generation of output levels. A voltage gain of 2 and a total standing voltage (TSV) of 10 is achieved though the proposed inverter. In order to realize the merit of the proposed MLI over recently developed topologies, a comparative analysis in terms of system components such as numbers of power electronic switches, gate driver circuits, diodes, and capacitors as well as system parameters such as voltage gain, TSV and power loss is presented. The proposed MLI is developed in the laboratory and is controlled through the digital signal processor TMS320F28379D using nearest level control technique. The experimental results are acquired for different loads and under varying modulation index to validate the feasibility of the proposed inverter.

2019 International Conference on Electrical, Electronics and Computer Engineering (UPCON), 2019

In this paper, a modified asymmetric switched-capacitor based MLI topology employing Switched-Cap... more In this paper, a modified asymmetric switched-capacitor based MLI topology employing Switched-Capacitor DC/DC converter (SCC) as a level generator is proposed. The topology has the ability of self-voltage boosting and self-balancing of capacitors voltage. Moreover, it does not require an auxiliary circuit or capacitor voltage balancing algorithm. The comparison of this topology with other existing reduced device topologies in terms of numbers of gate driver circuits, power electronic switches, diodes, and capacitors has been done. To verify the feasibility and performance of this topology, the simulation is performed in MATLAB®/Simulink 2017b platform.

IEEE Transactions on Industrial Electronics, 2022

2020 International Conference on Decision Aid Sciences and Application (DASA), 2020

In this paper a non-isolated dc-dc boost converter is described having high voltage gain ability.... more In this paper a non-isolated dc-dc boost converter is described having high voltage gain ability. The proposed high gain boost converter, unlike the conventional boost converter offers high voltage conversion at low duty ratio, thus have high comparative efficiency. The proposed dc-dc boost converter is based on the voltage lift (VL) technique, in which input voltage is boosted in step-by-step manner. A detailed analysis of proposed boost dc-dc converter for non-ideal model is presented. The performance of proposed converter is compared with the conventional boost converter in term of different parameters, viz. number of elements, voltage gain ratio, and switch stress. The proposed dc-dc converter has advantages over conventional one and is suitable for renewable energy resources (RES) applications, especially solar and wind energy. The results obtained both for proposed and conventional converters in MATLAB®/Simulink environment is validated through the lab scaled developed prototype.

Journal of Intelligent & Fuzzy Systems, 2022

Due to its clean and abundant availability, solar energy is popular as a source to generate elect... more Due to its clean and abundant availability, solar energy is popular as a source to generate electricity. Solar photovoltaic (PV) technology converts sunlight incident on the solar PV panel or array directly into non-linear DC electricity. However, the non-linear nature of the solar panels’ power needs to be tracked for its efficient utilization. The problem of non-linearity becomes more prominent when the solar PV array is shaded, even leading to high power losses and concentrated heating in some areas (hotspot condition) of the PV array. Bypass diodes used to eliminate the shading effect cause multiple peaks of power on the power versus voltage (P-V) curve and make the tracking problem quite complex. Conventional algorithms to track the optimal power point cannot search the complete P-V curve and often become trapped in local optima. More recently, metaheuristic algorithms have been employed for maximum power point tracking. Being stochastic, these algorithms explore the complete s...

Sustainability, 2022

Multilevel inverters (MLIs) are capable of producing high-quality output voltage and handling lar... more Multilevel inverters (MLIs) are capable of producing high-quality output voltage and handling large amounts of power. This reduces the size of the filter while also simplifying the circuitry. As a result, they have a wide range of applications in industries, particularly in smart grids. The input voltage boosting feature is required to use the MLI with renewable energy. Moreover, many components are required to get higher output voltage levels that add weight and cost to the circuit. Numerous MLI topologies have been identified to minimize the losses, device count, and device ratings. A seven-level modified H-bridge inverter with a reduced component count, and reduced THD is presented in this paper. Two DC sources with six IGBTs have been used to generate a seven-level output voltage, and the Aquila Optimizer (AO) has been implemented to get the regulated output. MATLAB/Simulink environment has been used for designing the simulation model. Furthermore, the simulation result has been...

International Journal of Circuit Theory and Applications, 2022

Electronics, 2021

The extensive employment of power semiconductor devices in multilevel inverters (MLIs) has the co... more The extensive employment of power semiconductor devices in multilevel inverters (MLIs) has the consequence of increased failure probabilities. With numerous applications demanding highly reliable inverters, several fault-tolerant schemes have been devised to address switch open-circuit faults. This paper analyzes a multilevel inverter topology for IGBT modules undergoing open-circuit faults, a major impediment to reliable operation within a power converter. Reconfiguration of modulation is performed post-fault. A modulation scheme is implemented across failure modes as a hybrid of nearest level control and selective harmonic elimination. Reliability assessment of the topology is performed, including a comparison with previous literature in terms of component requirements and reliability. Simulation results validate the proposed solutions.

Sustainability, 2021

This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a c... more This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a cascaded H-bridge (CHB) multilevel inverter (MLI). The foremost objective of the selective harmonic elimination (SHE) is to eliminate lower order harmonics by finding the optimal switching angle combination which minimizes the objective function containing Total Harmonic Distortion (THD) and other specific harmonic terms. Consequently, the THD is also reduced. In this study, a recently proposed metaheuristic technique named the Archimedes optimization algorithm (AOA) is used to determine the optimal angles corresponding to the 5, 7 and 9 level CHB-MLI. AOA involves equations related to a physical law, the Archimedes Principle. It is based on the idea of a buoyant force acting upward on a body or object that is partially or completely submerged in a fluid, and the upward force is related to the weight of the fluid displaced. This optimization technique has been implemented on CHB-MLI to ge...

Electronics, 2021

Implementing voltage boost multilevel inverter topologies for PV and fuel cell energy sources is ... more Implementing voltage boost multilevel inverter topologies for PV and fuel cell energy sources is highly advantageous. Switched-capacitor multilevel inverters (SCMLI) have a step-up feature with low device requirements and can remove the need for high gain dc-dc converters leading to reduced overall system bulk. This work proposes a dual input SCMLI to achieve an output of nineteen levels while using a low number of components and high boosting factor and self-balancing of capacitor voltages. A comprehensive analysis of the proposed structure is presented, focusing on component requirements, cost and dynamic performance. The efficiency and loss distribution during operation is also provided. The operation and real-time performance of the SCMLI have been verified by simulation. Experimental results further validate the simulation results.

Energies

Reliability of the multilevel inverters (MLIs) is one of the most important concerns in industria... more Reliability of the multilevel inverters (MLIs) is one of the most important concerns in industrial applications, mainly due to the semiconductor devices. Whenever a fault occurs in one of the switches of the inverter, it leads to abnormal conditions and can also cause serious damage to the equipment connected to the multilevel inverter. In this paper, a recently proposed nine-level Packed-E-Cell (PEC) multilevel inverter topology is investigated for its fault-tolerant capability and improved reliability. The analysis is carried out for a reduced device multilevel inverter topology that, due to a lack of redundant states, cannot tolerate switch failures. The fault-tolerant (FT) topology provides additional redundant states in the switching sequence of the existing topology. The work in this paper presents Packed-E-Cell MLI modified for fault tolerance against single-switch open-circuit faults. The modified FT topology inherently achieves self-voltage balance in the DC-link capacitors...

Energies

Multilevel inverters are increasingly being employed for industrial applications, such as speed c... more Multilevel inverters are increasingly being employed for industrial applications, such as speed control of motors and grid integration of distributed generation systems. The focus is on developing topologies that utilize fewer lower-rating switches and power sources while working efficiently and reliably. This work pertains to developing a three-phase multilevel inverter that employs switching capacitors and a single DC power supply that produces a nine-stage, three-phase voltage output. A recently proposed powerful meta-heuristic technique called symbiotic organism search (SOS) has been applied to identify the optimum switching angles for Selective Harmonic Elimination (SHE) from the output voltage waveform. A thorough converter analysis has also been done in the MATLAB/SIMULINK environment and is validated with the real-time hardware-in-the-loop (HIL) experiment results.

Applied Sciences

In this paper, a new transformerless high voltage gain dc-dc converter is proposed for low and me... more In this paper, a new transformerless high voltage gain dc-dc converter is proposed for low and medium power application. The proposed converter has high quadratic gain and utilizes only two inductors to achieve this gain. It has two switches that are operated simultaneously, making control of the converter easy. The proposed converter’s output voltage gain is higher than the conventional quadratic boost converter and other recently proposed high gain quadratic converters. A voltage multiplier circuit (VMC) is integrated with the proposed converter, which significantly increases the converter’s output voltage. Apart from a high output voltage, the proposed converter has low voltage stress across switches and capacitors, which is a major advantage of the proposed topology. A hardware prototype of 200 W of the proposed converter is developed in the laboratory to validate the converter’s performance. The efficiency of the converter is obtained through PLECS software by incorporating the...

2019 International Conference on Electrical, Electronics and Computer Engineering (UPCON)

Solar PV systems are increasingly becoming an indispensable source of energy owing to their simpl... more Solar PV systems are increasingly becoming an indispensable source of energy owing to their simple construction, pollution free operation, and comparatively low operating costs. The solar PV systems provide an eco-friendly, cheap and almost omnipresent availability of energy throughout the world. Although, seemingly a very lucrative and easily available source of energy, these systems are not very widely implemented as Solar PV systems are not very efficient and major power losses occur. Due to clouds, skyscrapers in metropolitan cities, huge trees in rural areas etc. the sunlight is inhibited this leads to the sun rays striking the surface of the PV cell in an uneven fashion thereby leading to high power losses where the intensity of light is low and high power peaks where the intensity of light is high. Bypass diodes are employed to mitigate the effect of partial shading, but their application causes multiple peaks of power at the output. To track and determine the maximum power amongst all the available power peaks in this paper a Nature-Inspired algorithm (PSODTVAC) is employed. This algorithm is compared with other established algorithms like the gravitational search algorithm (GSA), Standard PSO (PSOSTD) and PSO with time varying acceleration (PSOTVAC) and it was observed that the proposed algorithm outperformed these existing algorithms.

International Journal of Emerging Electric Power Systems

Selective Harmonic Elimination PWM (SHEPWM) is a classical method of voltage control of the inver... more Selective Harmonic Elimination PWM (SHEPWM) is a classical method of voltage control of the inverter while eliminating the undesirable lower order harmonics for low-frequency applications. Multivariable non-linear equations often result in SHE modulation scheme. In this work, a Most Valuable Player Algorithm (MVPA) has been applied to solve the non-linear SHE equations for the elimination of lower order harmonics in a cascaded H bridge multilevel inverter. The MVPA algorithm shows better convergence characteristics and wider modulation control compared to some popular meta-heuristic optimization methods. Optimized switching angles have been obtained for 5, 7 and 9 level inverters for different modulation index (MI) from 0.05 to 1. The Total Harmonic Distortion (THD) for the output voltage was found to be smoother compared to the powerful Differential Evolution (DE) algorithm for modulation index greater than 0.6. And for modulation index greater than 0.8, MVPA scores better than DE ...

Electronics

There is a need for the optimal positioning of protective devices to maximize customers satisfact... more There is a need for the optimal positioning of protective devices to maximize customers satisfaction per their demands. Such arrangement advances the distribution system reliability to maximum achievable. Thus, radial distribution system (RDS) reliability can be improved by placing reclosers at suitable feeder sections. This article presents comprehensive details of an attempt to determine the reclosers’ optimal location in an RDS to maximize the utility profit by reliability improvement. Assessment of different reliability indices such as SAIDI, SAIFI, CAIFI, CAIDI, etc., with recloser placement, exhibits a considerable improvement in these indices in contrast with the absence of recloser. Consequently, a new bidirectional formulation has been proposed for the optimized arrangement of reclosers’. This formulation efficiently handles the bidirectional power flow, resulting from distributed generation (DG) unit (s) in the system. The proposed model has been solved for a test system b...

Energies, 2021

In this paper, we proposed a home energy management system (HEMS) that includes photovoltaic (PV)... more In this paper, we proposed a home energy management system (HEMS) that includes photovoltaic (PV), electric vehicle (EV), and energy storage systems (ESS). The proposed HEMS fully utilizes the PV power in operating domestic appliances and charging EV/ESS. The surplus power is fed back to the grid to achieve economic benefits. A novel charging and discharging scheme of EV/ESS is presented to minimize the energy cost, control the maximum load demand, increase the battery life, and satisfy the user’s-traveling needs. The EV/ESS charges during low pricing periods and discharges in high pricing periods. In the proposed method, a multi-objective problem is formulated, which simultaneously minimizes the energy cost, peak to average ratio (PAR), and customer dissatisfaction. The multi-objective optimization is solved using binary particle swarm optimization (BPSO). The results clearly show that it minimizes the operating cost from 402.89 cents to 191.46 cents, so that a reduction of 52.47% ...

Electronics, 2021

The design of a solar PV system and its performance evaluation is an important aspect before goin... more The design of a solar PV system and its performance evaluation is an important aspect before going for a mass-scale installation and integration with the grid. The parameter evaluation of a solar PV model helps in accurate modeling and consequently efficient designing of the system. The parameters appear in the mathematical equations of the solar PV cell. A Chaos Induced Coyote Algorithm (CICA) to obtain the parameters in a single, double, and three diode model of a mono-crystalline, polycrystalline, and a thin-film solar PV cell has been proposed in this work. The Chaos Induced Coyote Algorithm for extracting the parameters incorporates the advantages of the conventional Coyote Algorithm by employing only two control parameters, making it easier to include the unique strategy that balances the exploration and exploitation in the search space. A comparison of the Chaos Induced Coyote Algorithm with some recently proposed solar photovoltaic cell parameter extraction algorithms has be...

2018 IEEMA Engineer Infinite Conference (eTechNxT), 2018

Multilevel Inverters have shaped a new trend of importance in industry and research. A new topolo... more Multilevel Inverters have shaped a new trend of importance in industry and research. A new topology of multilevel inverter is proposed in this paper which can be operated in symmetrical and asymmetrical modes. The proposed topology produces 7-level and 13-level staircase output voltage waveform for symmetrical and asymmetrical configuration respectively using only 10 switches. The gate signals for the different switches are produced employing the fundamental frequency switching technique. The topology achieves better performance using a lower minimum number of components in comparison to conventional inverters. These improvements result in reduced system cost and size. Simulations are carried out using MATLAB/SIMULINK environment and experimental implementation using laboratory prototype module have ascertained the performance and operation of the proposed topology.

IEEE Transactions on Industry Applications, 2021

Multilevel inverters (MLI) are gaining wider popularity owing to their increasing power handling ... more Multilevel inverters (MLI) are gaining wider popularity owing to their increasing power handling capability and improving power quality output. With an inclining trend towards renewable energy utilization, they find a vital application in wind and solar power generation systems. This article proposes a new multilevel dc–ac inverter. The proposed MLI produces a twenty five level output and offers an inherent capacitor self-balancing capability. The inherent self-balancing eliminates the requirement of auxiliary sensor circuit or capacitors voltage balancing algorithms. Dual asymmetric voltage sources and switched capacitors along with their proper charging/discharging pattern are utilized for the generation of output levels. A voltage gain of 2 and a total standing voltage (TSV) of 10 is achieved though the proposed inverter. In order to realize the merit of the proposed MLI over recently developed topologies, a comparative analysis in terms of system components such as numbers of power electronic switches, gate driver circuits, diodes, and capacitors as well as system parameters such as voltage gain, TSV and power loss is presented. The proposed MLI is developed in the laboratory and is controlled through the digital signal processor TMS320F28379D using nearest level control technique. The experimental results are acquired for different loads and under varying modulation index to validate the feasibility of the proposed inverter.

2019 International Conference on Electrical, Electronics and Computer Engineering (UPCON), 2019

In this paper, a modified asymmetric switched-capacitor based MLI topology employing Switched-Cap... more In this paper, a modified asymmetric switched-capacitor based MLI topology employing Switched-Capacitor DC/DC converter (SCC) as a level generator is proposed. The topology has the ability of self-voltage boosting and self-balancing of capacitors voltage. Moreover, it does not require an auxiliary circuit or capacitor voltage balancing algorithm. The comparison of this topology with other existing reduced device topologies in terms of numbers of gate driver circuits, power electronic switches, diodes, and capacitors has been done. To verify the feasibility and performance of this topology, the simulation is performed in MATLAB®/Simulink 2017b platform.

IEEE Transactions on Industrial Electronics, 2022

2020 International Conference on Decision Aid Sciences and Application (DASA), 2020

In this paper a non-isolated dc-dc boost converter is described having high voltage gain ability.... more In this paper a non-isolated dc-dc boost converter is described having high voltage gain ability. The proposed high gain boost converter, unlike the conventional boost converter offers high voltage conversion at low duty ratio, thus have high comparative efficiency. The proposed dc-dc boost converter is based on the voltage lift (VL) technique, in which input voltage is boosted in step-by-step manner. A detailed analysis of proposed boost dc-dc converter for non-ideal model is presented. The performance of proposed converter is compared with the conventional boost converter in term of different parameters, viz. number of elements, voltage gain ratio, and switch stress. The proposed dc-dc converter has advantages over conventional one and is suitable for renewable energy resources (RES) applications, especially solar and wind energy. The results obtained both for proposed and conventional converters in MATLAB®/Simulink environment is validated through the lab scaled developed prototype.

Journal of Intelligent & Fuzzy Systems, 2022

Due to its clean and abundant availability, solar energy is popular as a source to generate elect... more Due to its clean and abundant availability, solar energy is popular as a source to generate electricity. Solar photovoltaic (PV) technology converts sunlight incident on the solar PV panel or array directly into non-linear DC electricity. However, the non-linear nature of the solar panels’ power needs to be tracked for its efficient utilization. The problem of non-linearity becomes more prominent when the solar PV array is shaded, even leading to high power losses and concentrated heating in some areas (hotspot condition) of the PV array. Bypass diodes used to eliminate the shading effect cause multiple peaks of power on the power versus voltage (P-V) curve and make the tracking problem quite complex. Conventional algorithms to track the optimal power point cannot search the complete P-V curve and often become trapped in local optima. More recently, metaheuristic algorithms have been employed for maximum power point tracking. Being stochastic, these algorithms explore the complete s...

Sustainability, 2022

Multilevel inverters (MLIs) are capable of producing high-quality output voltage and handling lar... more Multilevel inverters (MLIs) are capable of producing high-quality output voltage and handling large amounts of power. This reduces the size of the filter while also simplifying the circuitry. As a result, they have a wide range of applications in industries, particularly in smart grids. The input voltage boosting feature is required to use the MLI with renewable energy. Moreover, many components are required to get higher output voltage levels that add weight and cost to the circuit. Numerous MLI topologies have been identified to minimize the losses, device count, and device ratings. A seven-level modified H-bridge inverter with a reduced component count, and reduced THD is presented in this paper. Two DC sources with six IGBTs have been used to generate a seven-level output voltage, and the Aquila Optimizer (AO) has been implemented to get the regulated output. MATLAB/Simulink environment has been used for designing the simulation model. Furthermore, the simulation result has been...

International Journal of Circuit Theory and Applications, 2022

Electronics, 2021

The extensive employment of power semiconductor devices in multilevel inverters (MLIs) has the co... more The extensive employment of power semiconductor devices in multilevel inverters (MLIs) has the consequence of increased failure probabilities. With numerous applications demanding highly reliable inverters, several fault-tolerant schemes have been devised to address switch open-circuit faults. This paper analyzes a multilevel inverter topology for IGBT modules undergoing open-circuit faults, a major impediment to reliable operation within a power converter. Reconfiguration of modulation is performed post-fault. A modulation scheme is implemented across failure modes as a hybrid of nearest level control and selective harmonic elimination. Reliability assessment of the topology is performed, including a comparison with previous literature in terms of component requirements and reliability. Simulation results validate the proposed solutions.

Sustainability, 2021

This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a c... more This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a cascaded H-bridge (CHB) multilevel inverter (MLI). The foremost objective of the selective harmonic elimination (SHE) is to eliminate lower order harmonics by finding the optimal switching angle combination which minimizes the objective function containing Total Harmonic Distortion (THD) and other specific harmonic terms. Consequently, the THD is also reduced. In this study, a recently proposed metaheuristic technique named the Archimedes optimization algorithm (AOA) is used to determine the optimal angles corresponding to the 5, 7 and 9 level CHB-MLI. AOA involves equations related to a physical law, the Archimedes Principle. It is based on the idea of a buoyant force acting upward on a body or object that is partially or completely submerged in a fluid, and the upward force is related to the weight of the fluid displaced. This optimization technique has been implemented on CHB-MLI to ge...

Electronics, 2021

Implementing voltage boost multilevel inverter topologies for PV and fuel cell energy sources is ... more Implementing voltage boost multilevel inverter topologies for PV and fuel cell energy sources is highly advantageous. Switched-capacitor multilevel inverters (SCMLI) have a step-up feature with low device requirements and can remove the need for high gain dc-dc converters leading to reduced overall system bulk. This work proposes a dual input SCMLI to achieve an output of nineteen levels while using a low number of components and high boosting factor and self-balancing of capacitor voltages. A comprehensive analysis of the proposed structure is presented, focusing on component requirements, cost and dynamic performance. The efficiency and loss distribution during operation is also provided. The operation and real-time performance of the SCMLI have been verified by simulation. Experimental results further validate the simulation results.