Due to rapid growth in industrialization and urbanization, much more capable transmission and dis... more Due to rapid growth in industrialization and urbanization, much more capable transmission and distribution system is required to overcome the growing demand for electricity. So, to mitigate the reliability and power quality, FACTS devices have been developed in recent decades. FACTS equipment operates under the direction of the system operator who analyzes its requirements through data acquired by traditional SCADA systems, state estimation algorithms and PMUs. SCADA works with PMU to provide accurate real time information on the operation of power system. The paper presents a strategy for the optimal location of FACTS devices and uses optimal number of PMUs to automate them. Intelligent Controllers are incorporated for the effective automation of FACTS devices using real time data from PMUs. Thus, reactive power control, voltage stability and power transfer capability of the system can be enhanced. Here MATLAB coding is used to optimize number of FACTS devices to improve voltage stability for IEEE 33 radial bus system. The optimization of PMUs is done by OPP Formulation and the obtained results are described briefly.
Authentication time is the main and important part of the authentication system. Normally the res... more Authentication time is the main and important part of the authentication system. Normally the response time should be fast but as the number of persons in the database increases, there is probability of more response time taken for authentication. The need of fast authentication system arises so that authentication time (matching time) is very less. This paper proposes a sliding window approach to make fast authentication system. The highlight of sliding window method is constant matching time, fast and can match translated images also. Several palmprint matching methods like match by correlation etc. are dependent upon the number of corners detected and so is the matching time. In sliding window method, matching time is constant as the numbers of matching operations are limited and the matching time is independent of the number of corners detected. The palmprint corner features extracted using two approaches Phase Congruency Corner Detector and Harris Corner Detector are binarized so that only useful information (features) is matched. The two approaches of Phase Congruency Corner Detector and Harris Corner Detector, when matched with hamming distance using sliding window can achieve recognition rate of 97.7% and 97.5% respectively.
Journal of Experimental & Applied Mechanics, May 1, 2019
Induction motors are operating as the support system for each industry. But like every different ... more Induction motors are operating as the support system for each industry. But like every different machine, due to serious duty cycles, poor operating atmosphere, installation and manufacturing factors, they gradually slow down or sometimes fail. That is why, diagnosis methods that are competent to sense the motor failures are necessary in order to increase the safety and the performances of with increasing needs for reliability and efficiency, the field of fault analysis in induction motor. Three-stage induction motor is the major running part in the industries and is the most applied electrical machine. So, detection of faults within the motor is incredibly necessary so as to enhance the performance of the induction motor, avoid the production loss and additionally, to minimize the operational prices. The finite part analysis and the additionally associated numerical models symbolize not solely a contemporary technology of induction motor computer-assisted style and optimization, however also a robust and really capable orientation within the analysis and detection of various faults related to the motor operation.
Condition monitoring method is suggested in this paper using Machine Current Signal Analysis (MCS... more Condition monitoring method is suggested in this paper using Machine Current Signal Analysis (MCSA) for analyzing Rotor eccentricity fault in Wind Turbine Generator (WTG). The suggested method measures the current characteristic frequencies generated by the WTG. Extraction and investigation of the excitations that are generated by WTG eccentricity fault are carried under, full load, no load and varying conditions of wind on a designed and developed test rig. FFT approach is used to calculate the side-band and wavelet-based analysis is further used to examine fault frequencies. Mean power at different resolution levels has been used to measure the fault magnitude. Experimentally, it has been demonstrated that for variable wind conditions MCSA lets suitable discrimination of faulty and healthy situations that lead to an effective method of diagnosis for condition monitoring (CM) of wind turbine (WT).
Access to electricity in remote rural areas has now become imperative as this will lead to the ov... more Access to electricity in remote rural areas has now become imperative as this will lead to the overall development of the agrarian population. The most convenient means to electrify the villages in these areas is to use Solar PV systems. This renewable energy technology being available only in daytime needs to be highly efficient so that besides just meeting the required load during sunshine hours, adequate electricity can be stored in the batteries to be used during night time. Such requirement can be easily met by the use of Solar PV trackers-single axis and dual axis. This study aims to compare the performance of three different mounting arrangements for PV system-fixed mounting, single axis trackers and dual axis trackers installed in remote rural areas of Jaisalmer in Rajasthan. The performance analysis is based on the comparison of technical and economic metrics. It is observed that the technical performance of dual axis trackers is the best in regard to the PV capacity requirement which is 11% less, the total energy production which is 15% more and the capacity utilization which is 6.9% more in comparison to the fixed mounting arrangement. But from economic point of view, the dual axis trackers are the most expensive with net present cost of 2.3% greater than the fixed mounting arrangement.
In this paper a new approach for maximum power point tracking (MPPT) is proposed. The fractional ... more In this paper a new approach for maximum power point tracking (MPPT) is proposed. The fractional open circuit voltage based MPPT states that the photovoltaic (PV) array voltage corresponding to the maximum power gives a linear dependence with respect to array open circuit voltage for different irradiation and temperature levels. This method is the easiest and simplest of all the MPPT methods but the disconnection of the PV array from the load on regular intervals for the sampling of the array voltage causes significant power loss. A new and simple approach is proposed by the simple linear equation of line for calculating the duty cycle of the boost converter which will extract the maximum power for the particular radiations. This topology can also be used for Wind energy systems but here the simulation is done with solar photovoltaic only. The proposed work is verified using MATLAB/SIMULNK and simulation results shows a clear improvement in achieving the desired results.
The power generation from renewable energy sources has become attractive to meet the increasing e... more The power generation from renewable energy sources has become attractive to meet the increasing energy demand over the globe. The grid integration of renewable energy farms is gaining popularity nowadays. The residual inverter capacity of these farms can be utilized to perform some additional tasks along with their basic operation of inversion. In this paper, the residual capacity of grid side inverters of large-scale solar and wind power farms is utilized as a static synchronous compensator (STATCOM) and a static synchronous series compensator (SSSC) devices in order to improve the overall power system performance such as to regulate line voltages, providing reactive power compensation and to increase the grid power transfer limit. The proposed control is verified in the MATLAB / Simulink environment.
The objective of this research paper is the simulation modeling of wind turbine emulator (WTE), w... more The objective of this research paper is the simulation modeling of wind turbine emulator (WTE), which is essential to make a test rig for Condition monitoring of wind turbine generator (WTG). Wind turbine characteristics are emulated by means of D.C machine. Further, the characteristics of wind turbine based on simulation results are discussed followed by a comprehensive discussion on the similarity of these characteristics with those of a D.C motor along with characteristics curves. The results and observations obtained in the present research verify the capability of WTE to vary the D.C motor torque as the replica of wind turbine rotor torque. The developed WTE allows a wind energy conversion system to be analyzed without the need of a real wind turbine.
This paper deals with the detailed study of model reference adaptive control (MRAC) based on roto... more This paper deals with the detailed study of model reference adaptive control (MRAC) based on rotor flux for speed estimation in a direct torque and flux control (DTFC) for permanent magnet synchronous motor (PMSM) drive. In this scheme the speed estimated is given as feedback to DTFC of PMSM drive. From reference model (RM) and adaptive model (AM), the rotor flux linkage components of the PMSM drive are obtained. The error signal of speed, which is obtained from the difference of RM and AM quantities are fed through PI controller to obtain the speed estimated. In order to reduce the error signal, the speed estimated is feedback to AM. Using MATLAB/SIMULINK software the MRAC based on rotor flux is compared with the quantities measured for PMSM drive. And the performance of PMSM drive is studied at zero load, loaded condition, sudden speed changes and sinusoidal speed respectively.
at microgrids, traditional approach to control the instabilities, is replaced by power electronic... more at microgrids, traditional approach to control the instabilities, is replaced by power electronic (PE) converters, which interfaced with non-conventional sources and battery storage. Due to intermittent nature of renewable sources, there is challenge to control the bus voltage regulation of DC microgrid. Therefore, inertia of DC microgrid is poorer than conventional grid. In this paper, different control strategy including PID controller, virtual capacitor, feedforward control of voltage control loop and current control loop are proposed and compared among of them to improve inertia of the DC microgrid with virtual inertia control circuit which enables the integration of storage and generation with improved dynamics and feed-forward control method are also used for suppressing the disturbances and its effect on dynamic response of DC-μG.
Due to rapid growth in industrialization and urbanization, much more capable transmission and dis... more Due to rapid growth in industrialization and urbanization, much more capable transmission and distribution system is required to overcome the growing demand for electricity. So, to mitigate the reliability and power quality, FACTS devices have been developed in recent decades. FACTS equipment operates under the direction of the system operator who analyzes its requirements through data acquired by traditional SCADA systems, state estimation algorithms and PMUs. SCADA works with PMU to provide accurate real time information on the operation of power system. The paper presents a strategy for the optimal location of FACTS devices and uses optimal number of PMUs to automate them. Intelligent Controllers are incorporated for the effective automation of FACTS devices using real time data from PMUs. Thus, reactive power control, voltage stability and power transfer capability of the system can be enhanced. Here MATLAB coding is used to optimize number of FACTS devices to improve voltage stability for IEEE 33 radial bus system. The optimization of PMUs is done by OPP Formulation and the obtained results are described briefly.
Authentication time is the main and important part of the authentication system. Normally the res... more Authentication time is the main and important part of the authentication system. Normally the response time should be fast but as the number of persons in the database increases, there is probability of more response time taken for authentication. The need of fast authentication system arises so that authentication time (matching time) is very less. This paper proposes a sliding window approach to make fast authentication system. The highlight of sliding window method is constant matching time, fast and can match translated images also. Several palmprint matching methods like match by correlation etc. are dependent upon the number of corners detected and so is the matching time. In sliding window method, matching time is constant as the numbers of matching operations are limited and the matching time is independent of the number of corners detected. The palmprint corner features extracted using two approaches Phase Congruency Corner Detector and Harris Corner Detector are binarized so that only useful information (features) is matched. The two approaches of Phase Congruency Corner Detector and Harris Corner Detector, when matched with hamming distance using sliding window can achieve recognition rate of 97.7% and 97.5% respectively.
Journal of Experimental & Applied Mechanics, May 1, 2019
Induction motors are operating as the support system for each industry. But like every different ... more Induction motors are operating as the support system for each industry. But like every different machine, due to serious duty cycles, poor operating atmosphere, installation and manufacturing factors, they gradually slow down or sometimes fail. That is why, diagnosis methods that are competent to sense the motor failures are necessary in order to increase the safety and the performances of with increasing needs for reliability and efficiency, the field of fault analysis in induction motor. Three-stage induction motor is the major running part in the industries and is the most applied electrical machine. So, detection of faults within the motor is incredibly necessary so as to enhance the performance of the induction motor, avoid the production loss and additionally, to minimize the operational prices. The finite part analysis and the additionally associated numerical models symbolize not solely a contemporary technology of induction motor computer-assisted style and optimization, however also a robust and really capable orientation within the analysis and detection of various faults related to the motor operation.
Condition monitoring method is suggested in this paper using Machine Current Signal Analysis (MCS... more Condition monitoring method is suggested in this paper using Machine Current Signal Analysis (MCSA) for analyzing Rotor eccentricity fault in Wind Turbine Generator (WTG). The suggested method measures the current characteristic frequencies generated by the WTG. Extraction and investigation of the excitations that are generated by WTG eccentricity fault are carried under, full load, no load and varying conditions of wind on a designed and developed test rig. FFT approach is used to calculate the side-band and wavelet-based analysis is further used to examine fault frequencies. Mean power at different resolution levels has been used to measure the fault magnitude. Experimentally, it has been demonstrated that for variable wind conditions MCSA lets suitable discrimination of faulty and healthy situations that lead to an effective method of diagnosis for condition monitoring (CM) of wind turbine (WT).
Access to electricity in remote rural areas has now become imperative as this will lead to the ov... more Access to electricity in remote rural areas has now become imperative as this will lead to the overall development of the agrarian population. The most convenient means to electrify the villages in these areas is to use Solar PV systems. This renewable energy technology being available only in daytime needs to be highly efficient so that besides just meeting the required load during sunshine hours, adequate electricity can be stored in the batteries to be used during night time. Such requirement can be easily met by the use of Solar PV trackers-single axis and dual axis. This study aims to compare the performance of three different mounting arrangements for PV system-fixed mounting, single axis trackers and dual axis trackers installed in remote rural areas of Jaisalmer in Rajasthan. The performance analysis is based on the comparison of technical and economic metrics. It is observed that the technical performance of dual axis trackers is the best in regard to the PV capacity requirement which is 11% less, the total energy production which is 15% more and the capacity utilization which is 6.9% more in comparison to the fixed mounting arrangement. But from economic point of view, the dual axis trackers are the most expensive with net present cost of 2.3% greater than the fixed mounting arrangement.
In this paper a new approach for maximum power point tracking (MPPT) is proposed. The fractional ... more In this paper a new approach for maximum power point tracking (MPPT) is proposed. The fractional open circuit voltage based MPPT states that the photovoltaic (PV) array voltage corresponding to the maximum power gives a linear dependence with respect to array open circuit voltage for different irradiation and temperature levels. This method is the easiest and simplest of all the MPPT methods but the disconnection of the PV array from the load on regular intervals for the sampling of the array voltage causes significant power loss. A new and simple approach is proposed by the simple linear equation of line for calculating the duty cycle of the boost converter which will extract the maximum power for the particular radiations. This topology can also be used for Wind energy systems but here the simulation is done with solar photovoltaic only. The proposed work is verified using MATLAB/SIMULNK and simulation results shows a clear improvement in achieving the desired results.
The power generation from renewable energy sources has become attractive to meet the increasing e... more The power generation from renewable energy sources has become attractive to meet the increasing energy demand over the globe. The grid integration of renewable energy farms is gaining popularity nowadays. The residual inverter capacity of these farms can be utilized to perform some additional tasks along with their basic operation of inversion. In this paper, the residual capacity of grid side inverters of large-scale solar and wind power farms is utilized as a static synchronous compensator (STATCOM) and a static synchronous series compensator (SSSC) devices in order to improve the overall power system performance such as to regulate line voltages, providing reactive power compensation and to increase the grid power transfer limit. The proposed control is verified in the MATLAB / Simulink environment.
The objective of this research paper is the simulation modeling of wind turbine emulator (WTE), w... more The objective of this research paper is the simulation modeling of wind turbine emulator (WTE), which is essential to make a test rig for Condition monitoring of wind turbine generator (WTG). Wind turbine characteristics are emulated by means of D.C machine. Further, the characteristics of wind turbine based on simulation results are discussed followed by a comprehensive discussion on the similarity of these characteristics with those of a D.C motor along with characteristics curves. The results and observations obtained in the present research verify the capability of WTE to vary the D.C motor torque as the replica of wind turbine rotor torque. The developed WTE allows a wind energy conversion system to be analyzed without the need of a real wind turbine.
This paper deals with the detailed study of model reference adaptive control (MRAC) based on roto... more This paper deals with the detailed study of model reference adaptive control (MRAC) based on rotor flux for speed estimation in a direct torque and flux control (DTFC) for permanent magnet synchronous motor (PMSM) drive. In this scheme the speed estimated is given as feedback to DTFC of PMSM drive. From reference model (RM) and adaptive model (AM), the rotor flux linkage components of the PMSM drive are obtained. The error signal of speed, which is obtained from the difference of RM and AM quantities are fed through PI controller to obtain the speed estimated. In order to reduce the error signal, the speed estimated is feedback to AM. Using MATLAB/SIMULINK software the MRAC based on rotor flux is compared with the quantities measured for PMSM drive. And the performance of PMSM drive is studied at zero load, loaded condition, sudden speed changes and sinusoidal speed respectively.
at microgrids, traditional approach to control the instabilities, is replaced by power electronic... more at microgrids, traditional approach to control the instabilities, is replaced by power electronic (PE) converters, which interfaced with non-conventional sources and battery storage. Due to intermittent nature of renewable sources, there is challenge to control the bus voltage regulation of DC microgrid. Therefore, inertia of DC microgrid is poorer than conventional grid. In this paper, different control strategy including PID controller, virtual capacitor, feedforward control of voltage control loop and current control loop are proposed and compared among of them to improve inertia of the DC microgrid with virtual inertia control circuit which enables the integration of storage and generation with improved dynamics and feed-forward control method are also used for suppressing the disturbances and its effect on dynamic response of DC-μG.
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Papers by Ratna Dahiya