Dheeraj Kumar Joshi - Academia.edu (original) (raw)

Papers by Dheeraj Kumar Joshi

Energies

In this paper, renewable resources, namely photovoltaic panels (PV), are placed in a specific con... more In this paper, renewable resources, namely photovoltaic panels (PV), are placed in a specific configuration to obtain the maximum reliability and availability of a microgrid and study the subcomponent-level reliability and availability. The reliability of components can be increased by trying different configurations of the components. We identify the preferred configuration used for the PV panels as bridged linked. The overall reliability of the microgrid is increased when component-wise reliability is considered. Even components are further divided into subcomponents, and the multiple faults of each component are considered. The method used for the reliability evaluation and availability study is Markov state transition modeling. The microgrid’s reliability and availability are plotted concerning time using Matlab. The optimization of reliability and availability is conducted through optimization techniques such as the genetic algorithm (GA) and artificial neural networks (ANN). T...

2019 10th International Renewable Energy Congress (IREC), 2019

The present work proposes an efficient scheme to control both voltage and frequency of a self-exc... more The present work proposes an efficient scheme to control both voltage and frequency of a self-excited induction generator (SEIG) that operates in isolated area. The proposed method consists on the connection of a static compensator (STATCOM) to the SEIG stator terminals in order to implement a novel control strategy based on a bidirectional flow of active and reactive power system. Simulation results are carried out from a developed model in MATLAB/Simulink environment. The analysis of these results exposes a robust stability of the autonomous conversion system following some perturbations in load and speed.

In this paper the steady state performance of self excited induction generators is determined usi... more In this paper the steady state performance of self excited induction generators is determined using particle swarm optimization(PSO) technique. The analysis is carried for R-L load. Simulated results obtained using the particle swarm optimization technique via Matlab facilitate in exploring the performance of self-excited induction generator.

This paper basically deals with the steady state analysis of Self excited induction generators. M... more This paper basically deals with the steady state analysis of Self excited induction generators. MATLAB user friendly toolbox has been used to predict the performance of SEIG under different loading conditions. In this paper the algorithm to find the minimum capacitance required to calculate the excitation capacitance has been stated using the steady state analysis. In this model the excitation capacitance and the speed of the SEIG is kept constant and the experimental results and simulated results are verified.

The controller is used to improve the dynamic performance of DC-DC converter by achieving a robus... more The controller is used to improve the dynamic performance of DC-DC converter by achieving a robust output voltage against load disturbances. This paper presents the performance of PI and Fuzzy controller for a phase- shifted zero-voltage switched full-bridge PWM (ZVS FB- PWM) converters with a closed loop control. The proposed converter is regulated with minimum overshoot and good stability. In this paper phase-shift control method is used as an effective tool to reduce switching losses and duty cycle losses. A 1kW/100KHz dc/dc converter is simulated and analyzed using MATLAB. The circuit is simulated for static and dynamic load (DC motor). It has been observed that performance of converter with fuzzy controller is better than that of PI controller. An efficiency comparison of the converter with a reported topology has also been carried out.

SKIT Research Journal, 2020

Rapid prototyping (RP) is one of the fabrication processes known to have inherent rapidity and fl... more Rapid prototyping (RP) is one of the fabrication processes known to have inherent rapidity and flexibility in its operation. It defines as a group of techniques that refers to the layer-by-layer fabrication of physical models three-dimensional (3D) directly from a computer-aided design (CAD). The paper focuses on basic steps in RP technique which include creating a CAD model and converting it to Standard Tessellation Language (STL) file format, slicing the STL file, layer by layer fabrication, cleaning and finishing the part. In recent years, increased use of computers has been visualized in CAD, Computer Aided Manufacturing (CAM) and Computerized Numerical Control (CNC) machine tools. Various prominent RP techniques such as Stereolithography (SL), Selective Laser Sintering (SLS), Fused Deposition Modeling (FDM), Laminated Object Manufacturing (LOM) etc. have been discussed in sufficient length. SL which is based on photopolymerisation or photo-curing and synthesis of polymers initi...

This thesis deals with switched mode power supplies based on resonant principle to achieve high e... more This thesis deals with switched mode power supplies based on resonant principle to achieve high efficiency. Several ways of switched mode power supplies optimalisation are described as part of the work to achieve better efficiency. Priparily, the new generation of switching elements based on SiC and resonant topology are used to achieve significant switching loss minimization. The selected resonant topology is simualted in detail and then built with focus on high efficiency. The main content of the work consists in the design and realization of the switched mode power supply with selected control algorithms and their comparison. The problems associated with usage of new SiC MOSFET generation in TO-247-4L package are being solved within the design and implementation of the power source. To solve the main problems, new 3 rd SiC MOSFET gate driver was developer for working with switching frequencies in hundreds of kHz and resisting very high voltage stress on the controlled transistor. The next part of the gate driver is the overcurrent protection. The overcurrent limit can be set easily by changing one component. This protection reacts very quickly in hundreds of nanoseconds, so it is capable of saving the converter even in branch failure and going to hard short circuit. The functional sample of the series resonant converter was built and revated in the work. The converter based on 3. Generation of SiC MOSFET transistors from Cree in a modern case TO-247-4L was built. For this inverter, it was also necessary to develop both the control scheme and the resonance frequency tracking to achieve accurate switching and thus achieve the use of the resonant principle of the converter to the maximum extent possible. The result of this work is up to 3 kW converter with adjustable output voltage while maintaining high efficiency up to 96%.

Journal of emerging technologies and innovative research, 2018

 In this paper the analysis of doubly fed induction generator has been done for varying rotor re... more  In this paper the analysis of doubly fed induction generator has been done for varying rotor resistance. Effects of the rotor resistance and rotor injected voltage on the stator active and reactive power, rotor active and reactive power, stator and rotor currents and net power of doubly fed induction generator are studied, when the machine run with below synchronous speed and above synchronous speed. After finding the induction machine parameters, analysis is done by MATLAB/ Simulink. It has been shown that with variation in rotor resistance and rotor injected voltage would control the mode of operation of induction machine; motoring mode and generating mode.

SKIT Research Journal, 2021

The rise in the domestic and industrial applications of granite and float glass which are hard an... more The rise in the domestic and industrial applications of granite and float glass which are hard and brittle is forcing manufacturing engineering to develop their precise and cost-effective machining techniques. These materials are used mainly in buildings, decorations, arts and optics industries which require a perfect surface finish and dimensional accuracies. Rotary ultrasonic face milling (RUFM) is preferred among all non-conventional machines for surface grinding. The main objective of this paper is to analyze the effect of process parameters on RUFM on float glass and red granite. The analysis of variance (ANOVA) method was used to find significant factors and determine interaction effects as well. Both the materials were compared for material removal rate (MRR) and surface roughness (SR) as response variables. In addition, SEM (Scanning Electron Microscope) was used for qualitative tool wear analyses and comparison between both materials after milling. The experimental results show that the MRR and SR during RUFM increase with all input parameters. Also, the process parameters have a significant effect on output responses. It was concluded that RUFM can successfully be used for brittle and hard material to obtain a micro-level surface finish with a normal material removal rate. In addition, it is surmised that more hardness of work material reduces the tool life.

SKIT Research Journal, 2020

Ultrasonic machining (USM) is a process used for machining material with high hardness and brittl... more Ultrasonic machining (USM) is a process used for machining material with high hardness and brittle nature that are difficult to machine. The USM has an upper hand on the other non-conventional process like electron discharge and laser beam machining which have thermal effect on workpiece. Workpiece chracteristics are also not limited by chemical and electrical properties. This paper discusses about the rotary ultrasonic drilling (RUD) machining process which is a variant of USM and the recent developments that it gone under through the RUD. This paper also reviews about the various methodology adopted by researchers to achieve optimum output parameters like Material Removal Rate, Surface roughness, Edge chipping etc. by altering the process characteristics like spindle speed, feed rate, ultrasonic power etc. as well as machine characteristics like tool type, support length etc. The paper also deals with the material used with the RUD worldwide and the findings of researchers on them.

Indonesian Journal of Electrical Engineering and Computer Science, 2020

This paper deeply explains the analysis through simulation and sizing of grid connected photovo... more This paper deeply explains the analysis through simulation and sizing of grid connected photovoltaic plant of 20MW for the site Devdurga, Karnataka India with use of PV syst software tool. Primarily, the trajectories the behavior of grid tied photovoltaic system at a particular location. It gives results for the geographical position taken by maps for avoiding the oversizing or under sizing of the systems which projects the installation with very much realistic conditions. The projected area is of about 110 acres would generate 44854 MWh/year for a 20MW PV system, with a performance ratio of 76.28%.Loss fraction taken for simulation and sizing is 2%.The paper also includes the study and behavior of the system with tilt and orientation of the PV Panel which gives better simulation results at similar latitudes for any feasible sizing.

Indonesian Journal of Electrical Engineering and Computer Science, 2020

Due to the advancement in the semiconductor technologies, DC-DC converters are gaining the import... more Due to the advancement in the semiconductor technologies, DC-DC converters are gaining the importance in several industrial applications. They form the core of the switched mode power supplies which are used in real time applications. The performance of the conventional converter is affected by the parasitic elements and their voltage gain is also limited. To improve upon this, Super lift converters converter were developed by Luo. Voltage lift technique increases the voltage in geometric progression .These super lift converter are classified as positive output and negative output which are further classified into different series. In this paper series of Positive output Super lift converter topologies are analyzed. The proportional –integral controller is employed to theses converter in the paper. These converters boost the voltage up to three times the input voltage and gaining importance in Electric vehicles and Solar powered applications. The simulations are carried in PSIM.

International Journal of Innovative Technology and Exploring Engineering, 2019

Due to the advancement in the semiconductor technology DC-DC converters are gaining the importanc... more Due to the advancement in the semiconductor technology DC-DC converters are gaining the importance in several industrial applications. They form the core of the switched mode power supplies used in real time applications. But the conventional DC -DC converter contains the voltage ripples due to the effect of the parasitic elements which is undesirable. The derived topologies of DC –DC converters from the conventional pumps eradicates this effect. In this paper the superlift LUO DC-DC converter will be presented which can replace the conventional converters. The effect of the parasitic elements is eradicated in superlift converter and range of the boosting the voltage level is high which will reduce the charging time and can be applicable for charging of o electric vehicles. The optimized proportional and integral controller using particle swarm optimization is applied to the presented converters.

IOP Conference Series: Materials Science and Engineering, 2019

"EFFI-CYCLE" derived from Efficient-Cycle promotes reducing dependency on fossil fuels for domest... more "EFFI-CYCLE" derived from Efficient-Cycle promotes reducing dependency on fossil fuels for domestic transport application. The objective of this paper is to conceive, design and fabricate a three-wheel configuration (tad-pole design) vehicle powered by human-electric hybrid power and capable of seating two passengers catering to the day to day mobility needs. PTC Creo 3.0 software is used for geometric modelling of the vehicle's frame. To ensure the safety of the design the model is then imported into ANSYS V16.2 for impact analyses. Results in terms of deformation, strain and von Mises stresses are plotted. After successfully completing the design and simulation of the frame and other components it is then fabricated in the college's (S R Engineering College, Warangal) workshop.

International Journal of Computer Applications, 2019

Non-linear loads connected in electrical power system leads to distortions in the source current ... more Non-linear loads connected in electrical power system leads to distortions in the source current waveform. One solution to improve power quality is the use of Shunt active power filter which are able to correct both the harmonics and the unbalance in the load current. In any active power filter system, performance of compensation of harmonics largely depends upon the algorithm adopted as the control methods are responsible for generating the reference currents which are used to trigger the voltage source inverters. In this paper, Hysteresis-band PWM is used as control strategy in which generated reference sin current wave is compared with actual current wave and the desired output of hysteresis-band PWM is applied to trigger the voltage source inverter. In this paper Shunt active power filter has been implemented in MATLAB using three different controllers in order to reduce current harmonics on load side. As the performance of three controllers Fractional PI, PI and ANN Controller have been simulated it has been concluded that in any system PI controller requires precise linear mathematical models, which are difficult to obtain and fails to perform satisfactorily under parameter variation, load disturbances, on the other hand Fractional PI Controller performs satisfactorily for the same Index Terms

Applied Energy, 2018

• Presents a parameter independent intelligent optimization technique. • Proposed technique is su... more • Presents a parameter independent intelligent optimization technique. • Proposed technique is suitable for both continuous and discrete variables. • Optimization technique is validated through mathematical benchmark functions.

Induction generators in self excited mode are found to be suitable for remote and windy locations... more Induction generators in self excited mode are found to be suitable for remote and windy locations. Prior to installation there is a need to predict the behaviour of machine under all possible operating conditions. This is possible through steady state modeling of such generators. Steady state analysis of self excited induction generator (SEIG) needs an estimation of generated frequency and

2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES), 2014

Self-excited induction generators (SEIG) are found to be most suitable candidate for wind energy ... more Self-excited induction generators (SEIG) are found to be most suitable candidate for wind energy conversion application required at remote windy locations. Such generators are not able to maintain the terminal voltage with load as, a literature survey reveals, the voltage profile falls sharply with load. In this paper an attempt has been made to improve the voltage profile of a self-excited induction generator. A new methodology based upon Genetic Algorithm (GA) is proposed to compute the steady state performance of the model including core loss branch. Further efforts are made to control the terminal voltage under loaded conditions. Simulated results using proposed modeling have been compared with experimental results. A close agreement between the computed and experimental results confirms the validity of the approach adopted.

IEEE Transactions on Energy Conversion, 2006

In this paper, genetic algorithm-based technique is proposed to estimate and analyze the steady-s... more In this paper, genetic algorithm-based technique is proposed to estimate and analyze the steady-state performance of a self-excited induction generator (SEIG). The study reveals that the performance of the SEIG is greatly influenced by the operating speed, load, and excitation capacitance. This provides an opportunity for the proper handling of these parameters so as to obtain the required performance characteristics. In this paper, a new technique is proposed to identify these parameters to achieve constant voltage constant frequency operation for SEIG. Theoretical results as obtained have been compared with experimental results and found to be in close agreement.

Electric Machines & Power Systems, 1991

The paper presents a suggested method for ac power generation from a constant speed drive using c... more The paper presents a suggested method for ac power generation from a constant speed drive using capacitor excited induction and reluctance machines. The proposed arrangement is adapted to use one stator frame and two rotor types, namely, salient poles reluctance and squirrel-cage induction rotors. Operational and steady-state equivalent circuits for both types are developed and used to predict the dynamic and steadystate behaviours under load conditions. This analysis depends mainly upon the computation of the power angle for a given machine parameters, capacitor ratings, and load conditions at a constant speed. Further, stability limits of both generators are investigated by developing the active-reactive power (P-Q) diagram for each generator. Conditions required to achieve self-excitation are also given. Performances of the two generator types are evaluated theoretically and experimentally.

Energies

In this paper, renewable resources, namely photovoltaic panels (PV), are placed in a specific con... more In this paper, renewable resources, namely photovoltaic panels (PV), are placed in a specific configuration to obtain the maximum reliability and availability of a microgrid and study the subcomponent-level reliability and availability. The reliability of components can be increased by trying different configurations of the components. We identify the preferred configuration used for the PV panels as bridged linked. The overall reliability of the microgrid is increased when component-wise reliability is considered. Even components are further divided into subcomponents, and the multiple faults of each component are considered. The method used for the reliability evaluation and availability study is Markov state transition modeling. The microgrid’s reliability and availability are plotted concerning time using Matlab. The optimization of reliability and availability is conducted through optimization techniques such as the genetic algorithm (GA) and artificial neural networks (ANN). T...

2019 10th International Renewable Energy Congress (IREC), 2019

The present work proposes an efficient scheme to control both voltage and frequency of a self-exc... more The present work proposes an efficient scheme to control both voltage and frequency of a self-excited induction generator (SEIG) that operates in isolated area. The proposed method consists on the connection of a static compensator (STATCOM) to the SEIG stator terminals in order to implement a novel control strategy based on a bidirectional flow of active and reactive power system. Simulation results are carried out from a developed model in MATLAB/Simulink environment. The analysis of these results exposes a robust stability of the autonomous conversion system following some perturbations in load and speed.

In this paper the steady state performance of self excited induction generators is determined usi... more In this paper the steady state performance of self excited induction generators is determined using particle swarm optimization(PSO) technique. The analysis is carried for R-L load. Simulated results obtained using the particle swarm optimization technique via Matlab facilitate in exploring the performance of self-excited induction generator.

This paper basically deals with the steady state analysis of Self excited induction generators. M... more This paper basically deals with the steady state analysis of Self excited induction generators. MATLAB user friendly toolbox has been used to predict the performance of SEIG under different loading conditions. In this paper the algorithm to find the minimum capacitance required to calculate the excitation capacitance has been stated using the steady state analysis. In this model the excitation capacitance and the speed of the SEIG is kept constant and the experimental results and simulated results are verified.

The controller is used to improve the dynamic performance of DC-DC converter by achieving a robus... more The controller is used to improve the dynamic performance of DC-DC converter by achieving a robust output voltage against load disturbances. This paper presents the performance of PI and Fuzzy controller for a phase- shifted zero-voltage switched full-bridge PWM (ZVS FB- PWM) converters with a closed loop control. The proposed converter is regulated with minimum overshoot and good stability. In this paper phase-shift control method is used as an effective tool to reduce switching losses and duty cycle losses. A 1kW/100KHz dc/dc converter is simulated and analyzed using MATLAB. The circuit is simulated for static and dynamic load (DC motor). It has been observed that performance of converter with fuzzy controller is better than that of PI controller. An efficiency comparison of the converter with a reported topology has also been carried out.

SKIT Research Journal, 2020

Rapid prototyping (RP) is one of the fabrication processes known to have inherent rapidity and fl... more Rapid prototyping (RP) is one of the fabrication processes known to have inherent rapidity and flexibility in its operation. It defines as a group of techniques that refers to the layer-by-layer fabrication of physical models three-dimensional (3D) directly from a computer-aided design (CAD). The paper focuses on basic steps in RP technique which include creating a CAD model and converting it to Standard Tessellation Language (STL) file format, slicing the STL file, layer by layer fabrication, cleaning and finishing the part. In recent years, increased use of computers has been visualized in CAD, Computer Aided Manufacturing (CAM) and Computerized Numerical Control (CNC) machine tools. Various prominent RP techniques such as Stereolithography (SL), Selective Laser Sintering (SLS), Fused Deposition Modeling (FDM), Laminated Object Manufacturing (LOM) etc. have been discussed in sufficient length. SL which is based on photopolymerisation or photo-curing and synthesis of polymers initi...

This thesis deals with switched mode power supplies based on resonant principle to achieve high e... more This thesis deals with switched mode power supplies based on resonant principle to achieve high efficiency. Several ways of switched mode power supplies optimalisation are described as part of the work to achieve better efficiency. Priparily, the new generation of switching elements based on SiC and resonant topology are used to achieve significant switching loss minimization. The selected resonant topology is simualted in detail and then built with focus on high efficiency. The main content of the work consists in the design and realization of the switched mode power supply with selected control algorithms and their comparison. The problems associated with usage of new SiC MOSFET generation in TO-247-4L package are being solved within the design and implementation of the power source. To solve the main problems, new 3 rd SiC MOSFET gate driver was developer for working with switching frequencies in hundreds of kHz and resisting very high voltage stress on the controlled transistor. The next part of the gate driver is the overcurrent protection. The overcurrent limit can be set easily by changing one component. This protection reacts very quickly in hundreds of nanoseconds, so it is capable of saving the converter even in branch failure and going to hard short circuit. The functional sample of the series resonant converter was built and revated in the work. The converter based on 3. Generation of SiC MOSFET transistors from Cree in a modern case TO-247-4L was built. For this inverter, it was also necessary to develop both the control scheme and the resonance frequency tracking to achieve accurate switching and thus achieve the use of the resonant principle of the converter to the maximum extent possible. The result of this work is up to 3 kW converter with adjustable output voltage while maintaining high efficiency up to 96%.

Journal of emerging technologies and innovative research, 2018

 In this paper the analysis of doubly fed induction generator has been done for varying rotor re... more  In this paper the analysis of doubly fed induction generator has been done for varying rotor resistance. Effects of the rotor resistance and rotor injected voltage on the stator active and reactive power, rotor active and reactive power, stator and rotor currents and net power of doubly fed induction generator are studied, when the machine run with below synchronous speed and above synchronous speed. After finding the induction machine parameters, analysis is done by MATLAB/ Simulink. It has been shown that with variation in rotor resistance and rotor injected voltage would control the mode of operation of induction machine; motoring mode and generating mode.

SKIT Research Journal, 2021

The rise in the domestic and industrial applications of granite and float glass which are hard an... more The rise in the domestic and industrial applications of granite and float glass which are hard and brittle is forcing manufacturing engineering to develop their precise and cost-effective machining techniques. These materials are used mainly in buildings, decorations, arts and optics industries which require a perfect surface finish and dimensional accuracies. Rotary ultrasonic face milling (RUFM) is preferred among all non-conventional machines for surface grinding. The main objective of this paper is to analyze the effect of process parameters on RUFM on float glass and red granite. The analysis of variance (ANOVA) method was used to find significant factors and determine interaction effects as well. Both the materials were compared for material removal rate (MRR) and surface roughness (SR) as response variables. In addition, SEM (Scanning Electron Microscope) was used for qualitative tool wear analyses and comparison between both materials after milling. The experimental results show that the MRR and SR during RUFM increase with all input parameters. Also, the process parameters have a significant effect on output responses. It was concluded that RUFM can successfully be used for brittle and hard material to obtain a micro-level surface finish with a normal material removal rate. In addition, it is surmised that more hardness of work material reduces the tool life.

SKIT Research Journal, 2020

Ultrasonic machining (USM) is a process used for machining material with high hardness and brittl... more Ultrasonic machining (USM) is a process used for machining material with high hardness and brittle nature that are difficult to machine. The USM has an upper hand on the other non-conventional process like electron discharge and laser beam machining which have thermal effect on workpiece. Workpiece chracteristics are also not limited by chemical and electrical properties. This paper discusses about the rotary ultrasonic drilling (RUD) machining process which is a variant of USM and the recent developments that it gone under through the RUD. This paper also reviews about the various methodology adopted by researchers to achieve optimum output parameters like Material Removal Rate, Surface roughness, Edge chipping etc. by altering the process characteristics like spindle speed, feed rate, ultrasonic power etc. as well as machine characteristics like tool type, support length etc. The paper also deals with the material used with the RUD worldwide and the findings of researchers on them.

Indonesian Journal of Electrical Engineering and Computer Science, 2020

This paper deeply explains the analysis through simulation and sizing of grid connected photovo... more This paper deeply explains the analysis through simulation and sizing of grid connected photovoltaic plant of 20MW for the site Devdurga, Karnataka India with use of PV syst software tool. Primarily, the trajectories the behavior of grid tied photovoltaic system at a particular location. It gives results for the geographical position taken by maps for avoiding the oversizing or under sizing of the systems which projects the installation with very much realistic conditions. The projected area is of about 110 acres would generate 44854 MWh/year for a 20MW PV system, with a performance ratio of 76.28%.Loss fraction taken for simulation and sizing is 2%.The paper also includes the study and behavior of the system with tilt and orientation of the PV Panel which gives better simulation results at similar latitudes for any feasible sizing.

Indonesian Journal of Electrical Engineering and Computer Science, 2020

Due to the advancement in the semiconductor technologies, DC-DC converters are gaining the import... more Due to the advancement in the semiconductor technologies, DC-DC converters are gaining the importance in several industrial applications. They form the core of the switched mode power supplies which are used in real time applications. The performance of the conventional converter is affected by the parasitic elements and their voltage gain is also limited. To improve upon this, Super lift converters converter were developed by Luo. Voltage lift technique increases the voltage in geometric progression .These super lift converter are classified as positive output and negative output which are further classified into different series. In this paper series of Positive output Super lift converter topologies are analyzed. The proportional –integral controller is employed to theses converter in the paper. These converters boost the voltage up to three times the input voltage and gaining importance in Electric vehicles and Solar powered applications. The simulations are carried in PSIM.

International Journal of Innovative Technology and Exploring Engineering, 2019

Due to the advancement in the semiconductor technology DC-DC converters are gaining the importanc... more Due to the advancement in the semiconductor technology DC-DC converters are gaining the importance in several industrial applications. They form the core of the switched mode power supplies used in real time applications. But the conventional DC -DC converter contains the voltage ripples due to the effect of the parasitic elements which is undesirable. The derived topologies of DC –DC converters from the conventional pumps eradicates this effect. In this paper the superlift LUO DC-DC converter will be presented which can replace the conventional converters. The effect of the parasitic elements is eradicated in superlift converter and range of the boosting the voltage level is high which will reduce the charging time and can be applicable for charging of o electric vehicles. The optimized proportional and integral controller using particle swarm optimization is applied to the presented converters.

IOP Conference Series: Materials Science and Engineering, 2019

"EFFI-CYCLE" derived from Efficient-Cycle promotes reducing dependency on fossil fuels for domest... more "EFFI-CYCLE" derived from Efficient-Cycle promotes reducing dependency on fossil fuels for domestic transport application. The objective of this paper is to conceive, design and fabricate a three-wheel configuration (tad-pole design) vehicle powered by human-electric hybrid power and capable of seating two passengers catering to the day to day mobility needs. PTC Creo 3.0 software is used for geometric modelling of the vehicle's frame. To ensure the safety of the design the model is then imported into ANSYS V16.2 for impact analyses. Results in terms of deformation, strain and von Mises stresses are plotted. After successfully completing the design and simulation of the frame and other components it is then fabricated in the college's (S R Engineering College, Warangal) workshop.

International Journal of Computer Applications, 2019

Non-linear loads connected in electrical power system leads to distortions in the source current ... more Non-linear loads connected in electrical power system leads to distortions in the source current waveform. One solution to improve power quality is the use of Shunt active power filter which are able to correct both the harmonics and the unbalance in the load current. In any active power filter system, performance of compensation of harmonics largely depends upon the algorithm adopted as the control methods are responsible for generating the reference currents which are used to trigger the voltage source inverters. In this paper, Hysteresis-band PWM is used as control strategy in which generated reference sin current wave is compared with actual current wave and the desired output of hysteresis-band PWM is applied to trigger the voltage source inverter. In this paper Shunt active power filter has been implemented in MATLAB using three different controllers in order to reduce current harmonics on load side. As the performance of three controllers Fractional PI, PI and ANN Controller have been simulated it has been concluded that in any system PI controller requires precise linear mathematical models, which are difficult to obtain and fails to perform satisfactorily under parameter variation, load disturbances, on the other hand Fractional PI Controller performs satisfactorily for the same Index Terms

Applied Energy, 2018

• Presents a parameter independent intelligent optimization technique. • Proposed technique is su... more • Presents a parameter independent intelligent optimization technique. • Proposed technique is suitable for both continuous and discrete variables. • Optimization technique is validated through mathematical benchmark functions.

Induction generators in self excited mode are found to be suitable for remote and windy locations... more Induction generators in self excited mode are found to be suitable for remote and windy locations. Prior to installation there is a need to predict the behaviour of machine under all possible operating conditions. This is possible through steady state modeling of such generators. Steady state analysis of self excited induction generator (SEIG) needs an estimation of generated frequency and

2014 IEEE 2nd International Conference on Electrical Energy Systems (ICEES), 2014

Self-excited induction generators (SEIG) are found to be most suitable candidate for wind energy ... more Self-excited induction generators (SEIG) are found to be most suitable candidate for wind energy conversion application required at remote windy locations. Such generators are not able to maintain the terminal voltage with load as, a literature survey reveals, the voltage profile falls sharply with load. In this paper an attempt has been made to improve the voltage profile of a self-excited induction generator. A new methodology based upon Genetic Algorithm (GA) is proposed to compute the steady state performance of the model including core loss branch. Further efforts are made to control the terminal voltage under loaded conditions. Simulated results using proposed modeling have been compared with experimental results. A close agreement between the computed and experimental results confirms the validity of the approach adopted.

IEEE Transactions on Energy Conversion, 2006

In this paper, genetic algorithm-based technique is proposed to estimate and analyze the steady-s... more In this paper, genetic algorithm-based technique is proposed to estimate and analyze the steady-state performance of a self-excited induction generator (SEIG). The study reveals that the performance of the SEIG is greatly influenced by the operating speed, load, and excitation capacitance. This provides an opportunity for the proper handling of these parameters so as to obtain the required performance characteristics. In this paper, a new technique is proposed to identify these parameters to achieve constant voltage constant frequency operation for SEIG. Theoretical results as obtained have been compared with experimental results and found to be in close agreement.

Electric Machines & Power Systems, 1991

The paper presents a suggested method for ac power generation from a constant speed drive using c... more The paper presents a suggested method for ac power generation from a constant speed drive using capacitor excited induction and reluctance machines. The proposed arrangement is adapted to use one stator frame and two rotor types, namely, salient poles reluctance and squirrel-cage induction rotors. Operational and steady-state equivalent circuits for both types are developed and used to predict the dynamic and steadystate behaviours under load conditions. This analysis depends mainly upon the computation of the power angle for a given machine parameters, capacitor ratings, and load conditions at a constant speed. Further, stability limits of both generators are investigated by developing the active-reactive power (P-Q) diagram for each generator. Conditions required to achieve self-excitation are also given. Performances of the two generator types are evaluated theoretically and experimentally.