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asha gaikwad

Jawaharlal Nehru University, Electrical, Faculty Member

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(IJIERT) International Journal of Innovations in Engineering Research and Technology IJIERT

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University of Sistan and Baluchestan

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Tallinn University of Technology

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Papers by asha gaikwad

Simulation Study of Qzsi Z-Source Inverter for Resistive and Inductive Load

Zenodo (CERN European Organization for Nuclear Research), Jun 20, 2015

This paper involves design and simulation of a step up dc/dc converter topology connected with th... more This paper involves design and simulation of a step up dc/dc converter topology connected with the chopper circuit intended for resistive and inductive load. The topology contains voltage fed qzsi Z Source Inverter (qzsi), a high frequency isolation transformer with reduced turn's ratio, a Voltage Doubler Rectifier (VDR). A carrier based Pulse-Width Modulation (PWM) which employs shoot through state strategy for qzsi is implemented which gives significantly high voltage gain compared to traditional PWM techniques. To improve the power density of converter, three phase aclink and three-phase VDR is implemented. The designed step up dc/dc converter is tested for various kinds of resistive and inductive load in MATLAB/SIMULIKN platform.

Comparative Study of Three level and Five level Inverter

International journal of advanced research in electrical, electronics and instrumentation engineering, Apr 15, 2016

This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc ... more This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc to ac power conversion. The simulation of multilevel inverters is done in MATLAB/SIMULINK software.The activepoweroutput,reactive power output and Total Harmonic Distortion (THD) in output voltage produced in 3-level and 5-level inverters are obtained and compared.It was observed that THD in 5-level inverteris less as compared to 3level inverter & THD in 7-level inverter is less as compared to 3-level and 5-level inverter.

MATLAB implementation of standalone hybrid wind-solar power generation with and without dump power control

In this paper unique approach for standalone hybrid model power generation system is been develop... more In this paper unique approach for standalone hybrid model power generation system is been developed using MATLAB simulink. While implementing this technique advance power control technique which used a four power sources, solar, wind, diesel generator and storage battery is demonstrated which is generally not use in commercial power system. Serious efforts has been put while completing this project for active, reactive and dump power control. The illustrated results in MATLAB shows magnitude and phases of output voltages are regulated if proposed system in implemented. The major advantage of using this system is different generation sources can be easily interconnected. In India there is huge potential for the conventional power generation using wind and sun, if proposed system is incorporated interconnection will be very easy, it will definitely contribute to the global environment.

Study of THD for various kinds of Loads Connected to the Distribution System

In recent years there has been a growing interest in moving away from large centralized power gen... more In recent years there has been a growing interest in moving away from large centralized power generation towards distributed energy sources. Hybrid solar and wind energy generation presents several benefits for use as a distributed energy resources, especially as a peaking power source. In case of solar PV the energy is harnessed in DC form. The dc power is converted into ac form and then fed to the grid or used in isolated load. Inverters are commonly used to convert dc power into ac power. Multilevel inverters have gained popularity in recent times as ac output power quality can be improved by increasing the number of levels of inverters..In this paper an effort is made to improve the power quality (voltage sag, swell, and harmonics) of smart grid of distributed generation with the use of multilevel inverter. With multilevel inverters harmonic contents gets reduced as the number of levels of output voltages is increased approaching the sine wave. The voltage stress alsogets reduce...

A Single-Phase Active Device For Power Quality Improvement Of Linear And Non-Linear Load

A Transformer less Hybrid Series Active Filter THSeAF is gives to improve the power quality in si... more A Transformer less Hybrid Series Active Filter THSeAF is gives to improve the power quality in single phase systems with critical loads. This paper helps the power quality issues related to Linear and Non-linear load. The control strategy is designed to prevent current harmonic distortions of non-linear loads to flow into the utility. While, protecting sensitive loads from voltage disturbances, sags, and swells initiated by the power system. This different forms hybrid topology allowing harmonic isolation and compensation of voltage distortions could absorb or inject the auxiliary power to the system. https://journalnx.com/journal-article/20150256

Development Of Solar Pv Battery Charger With Buck Convertr

This paper presents the design configuration with the least components to realize highly efficien... more This paper presents the design configuration with the least components to realize highly efficient solar energy battery charger with PWM based voltage controlled buck converter. PWM power converter is designed to use the power MOSFET as a switching switch and be operated in a switching on and switching off model to control the power MOSFET duty cycle to achieve the buck/boost topology. PWM power converters enhance the low efficiency shortcoming of the conventionally adopted linear power converter with increasing converter switching frequency. In proposed method, a change in solar energy input is considered and control loop of converter is then designed in a way that output is constant.

Design of Standalone PV Charging System for Lead Acid Battery using Controlled Boost Converter

2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC), 2017

With the rapid growth of global energy demand associated with society’s increasing awareness of e... more With the rapid growth of global energy demand associated with society’s increasing awareness of environmental impacts from the widespread utilization of fossil fuels has led to the exploration of renewable energy sources. Photovoltaic (PV) technology plays a vital role in such cases. Solar PV technology being easily and freely available which is fabulous for various applications. Photovoltaic systems can be used to exploit the solar energy in almost wide range of applications. Rapid technological changes have led to power electronic products playing a crucial role in daily life. Energy storage equipments are commonly used form of power electronic products. Thus a standalone PV system with novel control is proposed for dc applications. Various charging approaches give rise to various charging efficiencies and also indirectly influence the life of a battery charger. This paper presents the design configuration with the least components to realize efficient standalone solar energy battery charger for 40Ah, 48V lead acid battery system with PWM based voltage controlled boost converter with MATLAB. In PWM power converter we use the power MOSFET as a switching device and operated in a switching on and switching off mode to control the power MOSFET duty cycle to achieve the boost topology. PWM power converters improves the low efficiency shortcoming of the traditionally adopted linear power converter with increasing converter switching frequency. This paper also gives design of standalone power supply and solar panel and the results are presented using MATLAB Simulink.

Damping torque analysis of subsynchronous oscillations in power system

The power transfer capability of existing transmission line from generating station to load cente... more The power transfer capability of existing transmission line from generating station to load centers can be increased economically by using series capacitor compensation method. Series capacitor compensation is also better from the point of overall economics, system performance and environmental impact. When the series capacitors are used to compensate the transmission line to improve the power handling capacity, any electrical disturbance like load changes, line tripping etc. will give rise to a phenomenon called as subsynchronous resonance. This paper presents a method called damping torque analysis, which is heuristic in nature and simple to apply for study of subsynchronous resonance. In this method damping contribution of AC power system is calculated in the subsynchronous frequency range. For stability the electrical damping contribution if negative should not exceed in magnitude the inherent damping contribution due to friction, windage, eddy current losses, etc. This is a fre...

Hybrid solar and wind power generation with grid interconnection system for improving power quality

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES), 2016

Demand of electricity is growing very rapidly for industrialization & urbanization of India. Rene... more Demand of electricity is growing very rapidly for industrialization & urbanization of India. Renewable energy sources being available abundantly in nature can be considered as a better option over conventional energy sources. Solar and wind energy are available in large amount and can be considered as reliable source of power generation. Hybrid solar and wind energy systems can be used for rural electrification and modernization of remote area. In this paper, simulation and hardware model of hybrid solar and wind power system connected to grid is done. For this analysis is carried out on simulated model to determine sag, swell, source voltage, source current, percentage of THD. The prototype hardware model of single phase is developed. Seven level inverter is used for converting dc power generated from solar into ac. The advantage of using seven inverter is used to improve the overall power quality of the system. The proposed system is simulated through math's laboratory simulat...

Study of cascaded H-Bridge multilevel inverter

2016 International Conference on Automatic Control and Dynamic Optimization Techniques (ICACDOT), 2016

In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel ... more In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel inverter have high power application & low harmonics due to these applications it is used widely in the area of control and energy distribution. This paper includes performance of 3-Level, 5-Level & 7-Level cascaded H-Bridge multilevel inverter with respect to number of switches, total harmonic distortion, waveform pattern, harmonic spectrum, output voltage, voltage stress across the switch & input DC voltage with the help of simulation by using MTLAB/SIMULINK and implementation of Five level cascaded H-bridge multilevel inverter.

Solar Powered Auto Intensity Control of Street Lights

In the present system, mostly lightning up of highways is done through High Intensity Discharge L... more In the present system, mostly lightning up of highways is done through High Intensity Discharge Lamps (HID), whose energy consumption is high. It’s intensity cannot be controlled according to the requirement so there is a need to switch on to alternative method of lightning system i.e by using LEDs (Light Emitting Diodes). This system is built to overcome the present drawback of HID lamps. This system demonstrates the usage of the LEDs as the light source powered through solar panel with its variable intensity control as per the requirement. A cluster of LEDs are used to form a street light. The ATMEGA 16 contains programmable instructions which controls the intensity of LEDs based on the LDR sensor signals generated. The intensity of LEDs can be varied depending on the requirement of light on highways, thus saving electrical energy.

New Computational Algorithm for Reconfiguration of Radial Distribution Systems

Artificial Intelligent Systems and Machine Learning, 2009

Optimal reconfiguration of Radial Distribution System (RDS) is performed under the umbrella of Su... more Optimal reconfiguration of Radial Distribution System (RDS) is performed under the umbrella of Supervisory Control and Data Acquisition (SCADA) systems to achieve the best voltage and improved current profile with minimal kW losses. Significant amount of energy can be saved by reconfiguration of Radial Distribution Systems (RDS) without compromising radial nature of the system. However, due to inherent difficulty associated with RDS, it is often not possible to obtain an optimal solution using mathematical programming techniques. In this paper, an improved load flow algorithm with better computational efficiency is proposed for RDS solution. Another Computational algorithm is proposed to obtain optimally reconfigured RDS with improved voltage profile, minimal branch currents and minimal kW losses. The results obtained are compared with the other published papers to confirm the effectiveness of the proposed algorithm.

Eigen Valve Analysis of Subsynchronous Oscillations in Power System

In this paper subsynchronous resonance has been explained in brief & the eigenvalue method to ana... more In this paper subsynchronous resonance has been explained in brief & the eigenvalue method to analyse the subsynchronous oscillation has been explained in series compensated power system amenable to eigenvalue analysis has been developed. This model has been applied for the detailed investigation of turbine-generator torsional interaction & the parameters affecting it are been indentified.

Modified voltage stability index for radial distribution system

This study presents a new voltage stability index for identifying the node which is most sensitiv... more This study presents a new voltage stability index for identifying the node which is most sensitive to voltage collapse. Using this voltage stability index, it is possible to compute the stability index value at every node and the node at which the value of the voltage stability index is minimum is most sensitive to voltage collapse. The effectiveness of the proposed technique has been demonstrated through a 32-node and 69-node Radial Distribution System (RDS). It is shown that with the proposed voltage stability index for 69-node system, the node which is more sensitive to voltage collapse is node-65 which is the same as obtained by the voltage stability index developed by Chakravorty and Das (2001).

IRIS Pattern Recognition using Self-Organizing Neural Networks

With an increasing emphasis on security, automated personal identification based on biometrics ha... more With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention over the past decade. Iris recognition, as an emerging biometric recognition approach is receiving interest in both research and practical applications. Iris is a kind of physiological biometric feature. It contains unique texture and is complex enough to be used as a biometric signature. Compared with other biometric features such as face and fingerprint, iris patterns are more stable and reliable. This paper describes an iris recognition system, composed of iris image acquisition, iris image preprocessing, neural network training process and pattern matching. In this paper a digitally captured iris image is acquired and is then preprocessed. This is needed to remove the unwanted parts that are usually captured along with the iris image, to prevent effects due to a change in camera-to-face distance and also due to nonuniform illumination. The image t...

Design and Implementation of Isolated Multi-Output DC-DC Power Supply with Fixed and Programmable Voltage Levels

Currently, most of the day-to-day electrical and electronic appliances require DC inputs of diffe... more Currently, most of the day-to-day electrical and electronic appliances require DC inputs of different voltage levels. Therefore, to use them in a DC micro-grid, DC-DC converters with multiple voltage levels are required. Standardization in DC micro-grid is not yet done. Hence, every micro-grid has to use specially designed converters. Switched mode power supplies, now-a-days, are having high efficiency (70– 80%), small size and light weight. Hence, these switching regulators are replacing the conventional linear regulators in many applications. In early days, the control circuitry is made up of discrete transistor stages or controlling the duty cycle of switching transistors. Now, control circuitry consisting integrated circuit and microcontrollers. This paper presents the design of isolated multi-output DC-DC power supply where input is taken from batteries or ultra-capacitors. Multiple voltage levels are obtained by designing the multi-winding transformer and further converting th...

Analysis of mechanical stresses developed on TG shaft during faults

… ICTES 2007), 2007. ICTES. IET-UK …, 2007

... TG SHAFT DURING FAULTS Asha Gaikwad, 1 Prachi Rajarapollu 2 1.Assistant Professor E&amp;T... more

Magnetically Levitated Solar Motor

The Magnetically Levitated Solar Motor (MLSM) is a Solar-powered, the magnetically mounted electr... more The Magnetically Levitated Solar Motor (MLSM) is a Solar-powered, the magnetically mounted electric motor consists of a square-shaped body rotor. This carries the solar cells and the windings. To each winding two solar cells are connected in parallel. The horizontally arranged rotor shaft carries the rotor body and a magnet at each end. At one end of the shaft a tip of the rotor is mounted. On one end of the beam a glass plate is mounted on which rests the tip of the shaft. This prevents movement of the rotor in the axial direction. An additional magnet is located under the rotor which generates a magnetic field for the motor. The bearing of the rotor are magnetic bearings which are fixed in to both sides of the beam, the magnets act repugnant to each other as they have the same magnetization direction. The rotor is thus kept in abeyance. For the function of the MLSM the magnetic bearing is necessary because the producible torque of the motor is very low. The motor must match the dr...

IRIS Pattern Recognition using Self-Organizing Neural Networks

Ijca Proceedings on National Conference on Advancement in Electronics and Telecommunication Engineering, May 12, 2012

With an increasing emphasis on security, automated personal identification based on biometrics ha... more With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention over the past decade. Iris recognition, as an emerging biometric recognition approach is receiving interest in both research and practical applications. Iris is a kind of physiological biometric feature. It contains unique texture and is complex enough to be used as a biometric signature. Compared with other biometric features such as face and fingerprint, iris patterns are more stable and reliable. This paper describes an iris recognition system, composed of iris image acquisition, iris image preprocessing, neural network training process and pattern matching. In this paper a digitally captured iris image is acquired and is then preprocessed. This is needed to remove the unwanted parts that are usually captured along with the iris image, to prevent effects due to a change in camera-to-face distance and also due to nonuniform illumination. The image thus obtained is trained using self organizing map (SOM) and finally decision is made by matching.

Simulation Study of Qzsi Z-Source Inverter for Resistive and Inductive Load

Zenodo (CERN European Organization for Nuclear Research), Jun 20, 2015

This paper involves design and simulation of a step up dc/dc converter topology connected with th... more This paper involves design and simulation of a step up dc/dc converter topology connected with the chopper circuit intended for resistive and inductive load. The topology contains voltage fed qzsi Z Source Inverter (qzsi), a high frequency isolation transformer with reduced turn's ratio, a Voltage Doubler Rectifier (VDR). A carrier based Pulse-Width Modulation (PWM) which employs shoot through state strategy for qzsi is implemented which gives significantly high voltage gain compared to traditional PWM techniques. To improve the power density of converter, three phase aclink and three-phase VDR is implemented. The designed step up dc/dc converter is tested for various kinds of resistive and inductive load in MATLAB/SIMULIKN platform.

Comparative Study of Three level and Five level Inverter

International journal of advanced research in electrical, electronics and instrumentation engineering, Apr 15, 2016

This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc ... more This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc to ac power conversion. The simulation of multilevel inverters is done in MATLAB/SIMULINK software.The activepoweroutput,reactive power output and Total Harmonic Distortion (THD) in output voltage produced in 3-level and 5-level inverters are obtained and compared.It was observed that THD in 5-level inverteris less as compared to 3level inverter & THD in 7-level inverter is less as compared to 3-level and 5-level inverter.

MATLAB implementation of standalone hybrid wind-solar power generation with and without dump power control

In this paper unique approach for standalone hybrid model power generation system is been develop... more In this paper unique approach for standalone hybrid model power generation system is been developed using MATLAB simulink. While implementing this technique advance power control technique which used a four power sources, solar, wind, diesel generator and storage battery is demonstrated which is generally not use in commercial power system. Serious efforts has been put while completing this project for active, reactive and dump power control. The illustrated results in MATLAB shows magnitude and phases of output voltages are regulated if proposed system in implemented. The major advantage of using this system is different generation sources can be easily interconnected. In India there is huge potential for the conventional power generation using wind and sun, if proposed system is incorporated interconnection will be very easy, it will definitely contribute to the global environment.

Study of THD for various kinds of Loads Connected to the Distribution System

In recent years there has been a growing interest in moving away from large centralized power gen... more In recent years there has been a growing interest in moving away from large centralized power generation towards distributed energy sources. Hybrid solar and wind energy generation presents several benefits for use as a distributed energy resources, especially as a peaking power source. In case of solar PV the energy is harnessed in DC form. The dc power is converted into ac form and then fed to the grid or used in isolated load. Inverters are commonly used to convert dc power into ac power. Multilevel inverters have gained popularity in recent times as ac output power quality can be improved by increasing the number of levels of inverters..In this paper an effort is made to improve the power quality (voltage sag, swell, and harmonics) of smart grid of distributed generation with the use of multilevel inverter. With multilevel inverters harmonic contents gets reduced as the number of levels of output voltages is increased approaching the sine wave. The voltage stress alsogets reduce...

A Single-Phase Active Device For Power Quality Improvement Of Linear And Non-Linear Load

A Transformer less Hybrid Series Active Filter THSeAF is gives to improve the power quality in si... more A Transformer less Hybrid Series Active Filter THSeAF is gives to improve the power quality in single phase systems with critical loads. This paper helps the power quality issues related to Linear and Non-linear load. The control strategy is designed to prevent current harmonic distortions of non-linear loads to flow into the utility. While, protecting sensitive loads from voltage disturbances, sags, and swells initiated by the power system. This different forms hybrid topology allowing harmonic isolation and compensation of voltage distortions could absorb or inject the auxiliary power to the system. https://journalnx.com/journal-article/20150256

Development Of Solar Pv Battery Charger With Buck Convertr

This paper presents the design configuration with the least components to realize highly efficien... more This paper presents the design configuration with the least components to realize highly efficient solar energy battery charger with PWM based voltage controlled buck converter. PWM power converter is designed to use the power MOSFET as a switching switch and be operated in a switching on and switching off model to control the power MOSFET duty cycle to achieve the buck/boost topology. PWM power converters enhance the low efficiency shortcoming of the conventionally adopted linear power converter with increasing converter switching frequency. In proposed method, a change in solar energy input is considered and control loop of converter is then designed in a way that output is constant.

Design of Standalone PV Charging System for Lead Acid Battery using Controlled Boost Converter

2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC), 2017

With the rapid growth of global energy demand associated with society’s increasing awareness of e... more With the rapid growth of global energy demand associated with society’s increasing awareness of environmental impacts from the widespread utilization of fossil fuels has led to the exploration of renewable energy sources. Photovoltaic (PV) technology plays a vital role in such cases. Solar PV technology being easily and freely available which is fabulous for various applications. Photovoltaic systems can be used to exploit the solar energy in almost wide range of applications. Rapid technological changes have led to power electronic products playing a crucial role in daily life. Energy storage equipments are commonly used form of power electronic products. Thus a standalone PV system with novel control is proposed for dc applications. Various charging approaches give rise to various charging efficiencies and also indirectly influence the life of a battery charger. This paper presents the design configuration with the least components to realize efficient standalone solar energy battery charger for 40Ah, 48V lead acid battery system with PWM based voltage controlled boost converter with MATLAB. In PWM power converter we use the power MOSFET as a switching device and operated in a switching on and switching off mode to control the power MOSFET duty cycle to achieve the boost topology. PWM power converters improves the low efficiency shortcoming of the traditionally adopted linear power converter with increasing converter switching frequency. This paper also gives design of standalone power supply and solar panel and the results are presented using MATLAB Simulink.

Damping torque analysis of subsynchronous oscillations in power system

The power transfer capability of existing transmission line from generating station to load cente... more The power transfer capability of existing transmission line from generating station to load centers can be increased economically by using series capacitor compensation method. Series capacitor compensation is also better from the point of overall economics, system performance and environmental impact. When the series capacitors are used to compensate the transmission line to improve the power handling capacity, any electrical disturbance like load changes, line tripping etc. will give rise to a phenomenon called as subsynchronous resonance. This paper presents a method called damping torque analysis, which is heuristic in nature and simple to apply for study of subsynchronous resonance. In this method damping contribution of AC power system is calculated in the subsynchronous frequency range. For stability the electrical damping contribution if negative should not exceed in magnitude the inherent damping contribution due to friction, windage, eddy current losses, etc. This is a fre...

Hybrid solar and wind power generation with grid interconnection system for improving power quality

2016 IEEE 1st International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES), 2016

Demand of electricity is growing very rapidly for industrialization & urbanization of India. Rene... more Demand of electricity is growing very rapidly for industrialization & urbanization of India. Renewable energy sources being available abundantly in nature can be considered as a better option over conventional energy sources. Solar and wind energy are available in large amount and can be considered as reliable source of power generation. Hybrid solar and wind energy systems can be used for rural electrification and modernization of remote area. In this paper, simulation and hardware model of hybrid solar and wind power system connected to grid is done. For this analysis is carried out on simulated model to determine sag, swell, source voltage, source current, percentage of THD. The prototype hardware model of single phase is developed. Seven level inverter is used for converting dc power generated from solar into ac. The advantage of using seven inverter is used to improve the overall power quality of the system. The proposed system is simulated through math's laboratory simulat...

Study of cascaded H-Bridge multilevel inverter

2016 International Conference on Automatic Control and Dynamic Optimization Techniques (ICACDOT), 2016

In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel ... more In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel inverter have high power application & low harmonics due to these applications it is used widely in the area of control and energy distribution. This paper includes performance of 3-Level, 5-Level & 7-Level cascaded H-Bridge multilevel inverter with respect to number of switches, total harmonic distortion, waveform pattern, harmonic spectrum, output voltage, voltage stress across the switch & input DC voltage with the help of simulation by using MTLAB/SIMULINK and implementation of Five level cascaded H-bridge multilevel inverter.

Solar Powered Auto Intensity Control of Street Lights

In the present system, mostly lightning up of highways is done through High Intensity Discharge L... more In the present system, mostly lightning up of highways is done through High Intensity Discharge Lamps (HID), whose energy consumption is high. It’s intensity cannot be controlled according to the requirement so there is a need to switch on to alternative method of lightning system i.e by using LEDs (Light Emitting Diodes). This system is built to overcome the present drawback of HID lamps. This system demonstrates the usage of the LEDs as the light source powered through solar panel with its variable intensity control as per the requirement. A cluster of LEDs are used to form a street light. The ATMEGA 16 contains programmable instructions which controls the intensity of LEDs based on the LDR sensor signals generated. The intensity of LEDs can be varied depending on the requirement of light on highways, thus saving electrical energy.

New Computational Algorithm for Reconfiguration of Radial Distribution Systems

Artificial Intelligent Systems and Machine Learning, 2009

Optimal reconfiguration of Radial Distribution System (RDS) is performed under the umbrella of Su... more Optimal reconfiguration of Radial Distribution System (RDS) is performed under the umbrella of Supervisory Control and Data Acquisition (SCADA) systems to achieve the best voltage and improved current profile with minimal kW losses. Significant amount of energy can be saved by reconfiguration of Radial Distribution Systems (RDS) without compromising radial nature of the system. However, due to inherent difficulty associated with RDS, it is often not possible to obtain an optimal solution using mathematical programming techniques. In this paper, an improved load flow algorithm with better computational efficiency is proposed for RDS solution. Another Computational algorithm is proposed to obtain optimally reconfigured RDS with improved voltage profile, minimal branch currents and minimal kW losses. The results obtained are compared with the other published papers to confirm the effectiveness of the proposed algorithm.

Eigen Valve Analysis of Subsynchronous Oscillations in Power System

In this paper subsynchronous resonance has been explained in brief & the eigenvalue method to ana... more In this paper subsynchronous resonance has been explained in brief & the eigenvalue method to analyse the subsynchronous oscillation has been explained in series compensated power system amenable to eigenvalue analysis has been developed. This model has been applied for the detailed investigation of turbine-generator torsional interaction & the parameters affecting it are been indentified.

Modified voltage stability index for radial distribution system

This study presents a new voltage stability index for identifying the node which is most sensitiv... more This study presents a new voltage stability index for identifying the node which is most sensitive to voltage collapse. Using this voltage stability index, it is possible to compute the stability index value at every node and the node at which the value of the voltage stability index is minimum is most sensitive to voltage collapse. The effectiveness of the proposed technique has been demonstrated through a 32-node and 69-node Radial Distribution System (RDS). It is shown that with the proposed voltage stability index for 69-node system, the node which is more sensitive to voltage collapse is node-65 which is the same as obtained by the voltage stability index developed by Chakravorty and Das (2001).

IRIS Pattern Recognition using Self-Organizing Neural Networks

With an increasing emphasis on security, automated personal identification based on biometrics ha... more With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention over the past decade. Iris recognition, as an emerging biometric recognition approach is receiving interest in both research and practical applications. Iris is a kind of physiological biometric feature. It contains unique texture and is complex enough to be used as a biometric signature. Compared with other biometric features such as face and fingerprint, iris patterns are more stable and reliable. This paper describes an iris recognition system, composed of iris image acquisition, iris image preprocessing, neural network training process and pattern matching. In this paper a digitally captured iris image is acquired and is then preprocessed. This is needed to remove the unwanted parts that are usually captured along with the iris image, to prevent effects due to a change in camera-to-face distance and also due to nonuniform illumination. The image t...

Design and Implementation of Isolated Multi-Output DC-DC Power Supply with Fixed and Programmable Voltage Levels

Currently, most of the day-to-day electrical and electronic appliances require DC inputs of diffe... more Currently, most of the day-to-day electrical and electronic appliances require DC inputs of different voltage levels. Therefore, to use them in a DC micro-grid, DC-DC converters with multiple voltage levels are required. Standardization in DC micro-grid is not yet done. Hence, every micro-grid has to use specially designed converters. Switched mode power supplies, now-a-days, are having high efficiency (70– 80%), small size and light weight. Hence, these switching regulators are replacing the conventional linear regulators in many applications. In early days, the control circuitry is made up of discrete transistor stages or controlling the duty cycle of switching transistors. Now, control circuitry consisting integrated circuit and microcontrollers. This paper presents the design of isolated multi-output DC-DC power supply where input is taken from batteries or ultra-capacitors. Multiple voltage levels are obtained by designing the multi-winding transformer and further converting th...

Analysis of mechanical stresses developed on TG shaft during faults

… ICTES 2007), 2007. ICTES. IET-UK …, 2007

... TG SHAFT DURING FAULTS Asha Gaikwad, 1 Prachi Rajarapollu 2 1.Assistant Professor E&amp;T... more

Magnetically Levitated Solar Motor

The Magnetically Levitated Solar Motor (MLSM) is a Solar-powered, the magnetically mounted electr... more The Magnetically Levitated Solar Motor (MLSM) is a Solar-powered, the magnetically mounted electric motor consists of a square-shaped body rotor. This carries the solar cells and the windings. To each winding two solar cells are connected in parallel. The horizontally arranged rotor shaft carries the rotor body and a magnet at each end. At one end of the shaft a tip of the rotor is mounted. On one end of the beam a glass plate is mounted on which rests the tip of the shaft. This prevents movement of the rotor in the axial direction. An additional magnet is located under the rotor which generates a magnetic field for the motor. The bearing of the rotor are magnetic bearings which are fixed in to both sides of the beam, the magnets act repugnant to each other as they have the same magnetization direction. The rotor is thus kept in abeyance. For the function of the MLSM the magnetic bearing is necessary because the producible torque of the motor is very low. The motor must match the dr...

IRIS Pattern Recognition using Self-Organizing Neural Networks

Ijca Proceedings on National Conference on Advancement in Electronics and Telecommunication Engineering, May 12, 2012

With an increasing emphasis on security, automated personal identification based on biometrics ha... more With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention over the past decade. Iris recognition, as an emerging biometric recognition approach is receiving interest in both research and practical applications. Iris is a kind of physiological biometric feature. It contains unique texture and is complex enough to be used as a biometric signature. Compared with other biometric features such as face and fingerprint, iris patterns are more stable and reliable. This paper describes an iris recognition system, composed of iris image acquisition, iris image preprocessing, neural network training process and pattern matching. In this paper a digitally captured iris image is acquired and is then preprocessed. This is needed to remove the unwanted parts that are usually captured along with the iris image, to prevent effects due to a change in camera-to-face distance and also due to nonuniform illumination. The image thus obtained is trained using self organizing map (SOM) and finally decision is made by matching.