IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Modeling control of automatic voltage regulator with proportional integral de...eSAT Journals
Abstract The Automatic Voltage Regulator (AVR) cannot respond generator output voltage quickly resulting in drop voltage and can be affected to the electrical system. AVR controller simulation model created in power system based on real data from National Electricity Company (PLN) ( Tello Power Plant Makassar case). AVR controller response time under normal conditions has the oscillation time of about 9 seconds and response time when loaded is about 15 seconds. Resulting unstable voltage in the system follows load changes. With the addition of Proportional Integral Derivative (PID) controllers acquired a controlling response time to changing loads faster and system voltage will change the voltage stability limit of ± 5% of nominal voltage. AVR controller with PID is very suitable for controlling the voltage of power generation system due to changes in load. Key Words: Automatic Voltage Regulator, Proportional Integral Derivative
V/F Control of Squirrel Cage Induction Motor Drives Without Flux or Torque Me...Waqas Tariq
Based on the popular constant volts per hertz principle, two improvement techniques are presented: keeping maximum torque constant or keeping magnetic flux constant. An open-loop inverter-three-phase squirrel-cage induction motor drive system that provides constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency has been modeled, simulated and tested. Load performance analysis of the proposed system under different operation conditions was provided. These principles of operation are extended to the case of operation from variable frequency or variable voltage control method. Finally, the effects of the non-sinusoidal voltage and/or current wave shapes are covered. The results show that both suggested improvement techniques (constant torque or constant flux) improve the steady-state performance A.C. drive system with squirrel cage induction motors. The slip speed has been decreased and the starting torque and maximum torque have been increased, which means that the suggested control techniques can be used in drive systems with short time operating mode under light loads.
Implementation of ac induction motor control using constant vhz principle and...eSAT Journals
Abstract
This paper presents the hardware implementation of V/f control of induction motor using sine wave PWM method. Because of its
simplicity, the V/F control also called as the scalar control, is the most widely used speed control method in the industrial
applications. In this method the ratio between stator voltage to frequency is maintained constant so that the stator flux is
maintained constant. As the stator flux is maintained constant, the torque developed by the motor depends only on the slip speed
and is independent of the supply frequency. Thus we can control the speed and torque of induction motor by simply controlling the
slip speed of induction motor. The complete control is achieved with the help of TMS320F28027 Development Board. One of the
basic requirements of this scheme is the PWM inverter. The gating signals are generated using sine wave PWM technique.
Implementation issues such as PWM signal generation, ramp control, v/f control, inverter design are discussed. The results are
discussed based on the various waveforms.
KeyWords: v/f control, Induction motor, PWM, and Scalar control
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Matrix Converter based Direct Torque Control of Induction MotorNeehar NLN
This topic falls under the area of speed control of induction motor. The using of advanced power electronic converters provides better response. In this case, a AC/AC converter is used to control the induction motor.
Modeling control of automatic voltage regulator with proportional integral de...eSAT Journals
Abstract The Automatic Voltage Regulator (AVR) cannot respond generator output voltage quickly resulting in drop voltage and can be affected to the electrical system. AVR controller simulation model created in power system based on real data from National Electricity Company (PLN) ( Tello Power Plant Makassar case). AVR controller response time under normal conditions has the oscillation time of about 9 seconds and response time when loaded is about 15 seconds. Resulting unstable voltage in the system follows load changes. With the addition of Proportional Integral Derivative (PID) controllers acquired a controlling response time to changing loads faster and system voltage will change the voltage stability limit of ± 5% of nominal voltage. AVR controller with PID is very suitable for controlling the voltage of power generation system due to changes in load. Key Words: Automatic Voltage Regulator, Proportional Integral Derivative
V/F Control of Squirrel Cage Induction Motor Drives Without Flux or Torque Me...Waqas Tariq
Based on the popular constant volts per hertz principle, two improvement techniques are presented: keeping maximum torque constant or keeping magnetic flux constant. An open-loop inverter-three-phase squirrel-cage induction motor drive system that provides constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency has been modeled, simulated and tested. Load performance analysis of the proposed system under different operation conditions was provided. These principles of operation are extended to the case of operation from variable frequency or variable voltage control method. Finally, the effects of the non-sinusoidal voltage and/or current wave shapes are covered. The results show that both suggested improvement techniques (constant torque or constant flux) improve the steady-state performance A.C. drive system with squirrel cage induction motors. The slip speed has been decreased and the starting torque and maximum torque have been increased, which means that the suggested control techniques can be used in drive systems with short time operating mode under light loads.
Implementation of ac induction motor control using constant vhz principle and...eSAT Journals
Abstract
This paper presents the hardware implementation of V/f control of induction motor using sine wave PWM method. Because of its
simplicity, the V/F control also called as the scalar control, is the most widely used speed control method in the industrial
applications. In this method the ratio between stator voltage to frequency is maintained constant so that the stator flux is
maintained constant. As the stator flux is maintained constant, the torque developed by the motor depends only on the slip speed
and is independent of the supply frequency. Thus we can control the speed and torque of induction motor by simply controlling the
slip speed of induction motor. The complete control is achieved with the help of TMS320F28027 Development Board. One of the
basic requirements of this scheme is the PWM inverter. The gating signals are generated using sine wave PWM technique.
Implementation issues such as PWM signal generation, ramp control, v/f control, inverter design are discussed. The results are
discussed based on the various waveforms.
KeyWords: v/f control, Induction motor, PWM, and Scalar control
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
Matrix Converter based Direct Torque Control of Induction MotorNeehar NLN
This topic falls under the area of speed control of induction motor. The using of advanced power electronic converters provides better response. In this case, a AC/AC converter is used to control the induction motor.
Analysis and Simulation of Asynchronous Machine Connected with Load Accomplis...YogeshIJTSRD
This paper presents the simulation analysis of pulse width modulation based induction motor drive. The main objective of this paper is analysis of asynchronous machine with PWM fed inverter and harmonic analysis of active and reactive power as well as voltage and current. Space vector pulse width modulation technique is used in various industrial applications. Variation in voltage and frequency supply to ac drives is produced from a voltage source inverter and space vector PWM is used frequently now a day due to their easy understanding. This work is based on a SVPWM based induction motor based on space vector theory. The simulation is done on MATLAB software and the simulation results obtained and analyzed. Ms. Neetu Khunte | Mr. Abhijeet Lal | Mr. Abhishek Agrawal "Analysis and Simulation of Asynchronous Machine Connected with Load Accomplished with Chopper Control and PWM Based Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd41190.pdf Paper URL: https://www.ijtsrd.comengineering/electronics-and-communication-engineering/41190/analysis-and-simulation-of-asynchronous-machine-connected-with-load-accomplished-with-chopper-control-and-pwm-based-inverter/ms-neetu-khunte
Controlling power flow losses in upfc system using adaptive neuro fuzzy contr...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
speed control of three phase induction motor using IOTswaroop009
The main aim is to control and monitor the speed of the three-phase induction motor by using the Arduino, node MCU controller and 3-phase inverter circuits.
Induction motor fault diagnosis by motor current signature analysis and neura...Editor Jacotech
This paper presents steps in designing dimensions of antenna and feed in axisymmetrical Cassegrain Antennas. Corrugated conical horns are used as feeds in applications with circular polarization. In the initial design steps, diameter of the main reflector is determined considering communication link budget, then feed dimensions are designed to create optimum aperture efficiency. In the last step of design, considering feed dimensions and the amount of its center phase displacements with respect to its aperture plane, dimensions of subreflector is determined to avoid additional blockage. To illustrate the procedure, an applicative design example is presented in X-band.
Simulation of Direct Torque Control of Induction motor using Space Vector Mo...IJMER
This paper presents simulation of Direct Torque Control (DTC) of Induction Motor using Space
Vector Modulation (SVM). Direct Torque Control is a control strategy used for high performance torque
control of Induction Motor. This SVM based DTC technique reduces torque ripple and improves torque
response. The performance is explained using simulation in MATLAB environment. Result of the
simulation done in the paper shows improvement in flux and torque. These results verifies the merits of
DTC- SVM over conventional Direct Torque Control technique.
Analysis and control of four quadrant operation of three phase brushless dc (...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Updated field oriented control of induction motor.pptxMohit Sharma
It is a simulation work project done on a 5hp,440V/5A and 1440rpm Induction motor.It explains the control of induction motor using matlab-simulink algorithm by PI control as well as Fuzzy logic control.
Induction motor modelling and applicationsUmesh Dadde
A three-phase induction motor is one of the most popular and versatile motor in electrical
power system and industries. It can perform the best when operated using a balanced three-phase
supply of the correct frequency. In spite of their robustness they do occasionally fail and their
resulting unplanned downtime can prove very costly. Therefore, condition monitoring of
electrical machines has received considerable attention in recent years.
Control of variable reluctance machine (8/6) by artificiel intelligence techn...IJECEIAES
The non-linearity of variable-Reluctance Machine (8/6) and the dependence of machine inductance on rotor position and applied current complicate the development of the control strategies of drives using variable-Reluctance Machine variable-Reluctance Machine (VRM). The classical-control algorithms for example of derived full proportional action may prove sufficient if the requirements on the accuracy and performance of systems are not too strict. In the opposite case and particularly when the controlled part is submitted to strong nonlinearity and to temporal variations, control techniques must be designed which ensure the robustness of the process with respect to the uncertainties on the parameters and their variations. These techniques include artificial-intelligence-based techniques constituted of neural networks and fuzzy logic. This technique has the ability to replace PID regulators by nonlinear ones using the human brain’s reasoning and functioning and is simulated by using MATLAB/Simulink software. Finally, by using obtained waveforms, these results will be compared.
User search goal inference and feedback session using fast generalized – fuzz...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Analysis and Simulation of Asynchronous Machine Connected with Load Accomplis...YogeshIJTSRD
This paper presents the simulation analysis of pulse width modulation based induction motor drive. The main objective of this paper is analysis of asynchronous machine with PWM fed inverter and harmonic analysis of active and reactive power as well as voltage and current. Space vector pulse width modulation technique is used in various industrial applications. Variation in voltage and frequency supply to ac drives is produced from a voltage source inverter and space vector PWM is used frequently now a day due to their easy understanding. This work is based on a SVPWM based induction motor based on space vector theory. The simulation is done on MATLAB software and the simulation results obtained and analyzed. Ms. Neetu Khunte | Mr. Abhijeet Lal | Mr. Abhishek Agrawal "Analysis and Simulation of Asynchronous Machine Connected with Load Accomplished with Chopper Control and PWM Based Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd41190.pdf Paper URL: https://www.ijtsrd.comengineering/electronics-and-communication-engineering/41190/analysis-and-simulation-of-asynchronous-machine-connected-with-load-accomplished-with-chopper-control-and-pwm-based-inverter/ms-neetu-khunte
Controlling power flow losses in upfc system using adaptive neuro fuzzy contr...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
speed control of three phase induction motor using IOTswaroop009
The main aim is to control and monitor the speed of the three-phase induction motor by using the Arduino, node MCU controller and 3-phase inverter circuits.
Induction motor fault diagnosis by motor current signature analysis and neura...Editor Jacotech
This paper presents steps in designing dimensions of antenna and feed in axisymmetrical Cassegrain Antennas. Corrugated conical horns are used as feeds in applications with circular polarization. In the initial design steps, diameter of the main reflector is determined considering communication link budget, then feed dimensions are designed to create optimum aperture efficiency. In the last step of design, considering feed dimensions and the amount of its center phase displacements with respect to its aperture plane, dimensions of subreflector is determined to avoid additional blockage. To illustrate the procedure, an applicative design example is presented in X-band.
Simulation of Direct Torque Control of Induction motor using Space Vector Mo...IJMER
This paper presents simulation of Direct Torque Control (DTC) of Induction Motor using Space
Vector Modulation (SVM). Direct Torque Control is a control strategy used for high performance torque
control of Induction Motor. This SVM based DTC technique reduces torque ripple and improves torque
response. The performance is explained using simulation in MATLAB environment. Result of the
simulation done in the paper shows improvement in flux and torque. These results verifies the merits of
DTC- SVM over conventional Direct Torque Control technique.
Analysis and control of four quadrant operation of three phase brushless dc (...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Updated field oriented control of induction motor.pptxMohit Sharma
It is a simulation work project done on a 5hp,440V/5A and 1440rpm Induction motor.It explains the control of induction motor using matlab-simulink algorithm by PI control as well as Fuzzy logic control.
Induction motor modelling and applicationsUmesh Dadde
A three-phase induction motor is one of the most popular and versatile motor in electrical
power system and industries. It can perform the best when operated using a balanced three-phase
supply of the correct frequency. In spite of their robustness they do occasionally fail and their
resulting unplanned downtime can prove very costly. Therefore, condition monitoring of
electrical machines has received considerable attention in recent years.
Control of variable reluctance machine (8/6) by artificiel intelligence techn...IJECEIAES
The non-linearity of variable-Reluctance Machine (8/6) and the dependence of machine inductance on rotor position and applied current complicate the development of the control strategies of drives using variable-Reluctance Machine variable-Reluctance Machine (VRM). The classical-control algorithms for example of derived full proportional action may prove sufficient if the requirements on the accuracy and performance of systems are not too strict. In the opposite case and particularly when the controlled part is submitted to strong nonlinearity and to temporal variations, control techniques must be designed which ensure the robustness of the process with respect to the uncertainties on the parameters and their variations. These techniques include artificial-intelligence-based techniques constituted of neural networks and fuzzy logic. This technique has the ability to replace PID regulators by nonlinear ones using the human brain’s reasoning and functioning and is simulated by using MATLAB/Simulink software. Finally, by using obtained waveforms, these results will be compared.
User search goal inference and feedback session using fast generalized – fuzz...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Overview of wireless network control protocol in smart phone deviceseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Real time energy data acquisition and alarming system for monitoring power co...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Performance analysis of various parameters by comparison of conventional pitc...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Experimental studies on pressure drop in a sinusoidal plate heat exchanger ef...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
The interconnecting mechanism for monitoring regular domestic conditioneSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Modeling & analysis of standalone photovoltaic systemeSAT Journals
Abstract This paper represents the three phase Photovoltaic system connected with variable load in a standalone mode’s mathematical modeling using MATLAB/ Simulink environment. The system consist of a PV Array, Boost converter, three phase inverter and its control to maintain load in standalone mode. The 40 kW systems at the college site is under the study with a variable inductive load of 30kW which has to be fed by PV system in continuous mode .This paper gives analysis of each components of system while maintaining the load. The constant and boosted DC voltage is obtained with the help of boost converter from PV Array. The three phase IGBT inverter PWM control scheme is proposed here to normalize the voltage imbalance during variable load. Keywords: Photovoltaic System, Boost Converter, IGBT Inverter, and PI Controller etc…
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Igbt based on vector control of induction motor driveeSAT Journals
Abstract
Generally, induction motor is fed by Current supply Inverter (CSI). During this project, hybrid model during which CSI area unit
accustomed feed the induction motor, are introduced. CSI employed in this work is SCR primarily based device. the standard gate
turn-off thyristor (GTO) primarily based CSI-fed induction motor drives suffer from draw- backs like low-frequency torsion pulsation,
harmonic heating and unstable operation at low-speed ranges. so as to beat these drawbacks, STATCOM is an efficient answer for
facing such power quality issues. This report deals with one in all the potential applications of Static Synchronous Compensator
(STATCOM) to industrial systems for mitigation of voltage dip drawback. The dip in voltage is mostly encountered throughout the
beginning of Associate in nursing induction motor. The model of STATCOM connected in shunt configuration to a 3 part supply
feeding dynamic motor masses is developed exploitation Simulink of MATLAB software package. Simulated results demonstrate that
STATCOM may be thought-about as a viable answer for finding such voltage dip issues. This thesis work aims at developing a
STATCOM for induction machines with reduced voltage dip.
Keywords: STATCOM, CSI,
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Performance analysis of a single phase ac voltage controller under induction ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Control of inverters to support bidirectional power flow in grid connected sy...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Design of a wind power generation system using a permanent magnet synchronous...eSAT Journals
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Analytical study and implementation of digital excitation system for diesel generators
1. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 769
ANALYTICAL STUDY AND IMPLEMENTATION OF DIGITAL
EXCITATION SYSTEM FOR DIESEL GENERATORS
Sreehari S1
, Deepak C R2
1
Student, Electrical and Electronics Department, 2
Student, Computer Science Department,
Amrita Vishwa Vidyapeetham, Tamil Nadu, India, sreeharicybex@gmail.com, deepakcrk@gmail.com
Abstract
This paper aims at the study of DIGITAL EXCITATION SYSTEM [Micro Controller based automatic voltage regulator] employed for
synchronous generators .The main component of the digital excitation system is the Automatic Voltage Regulator. This maintains the
machine terminal voltage in desired reference, which can be varied in order to accomplish different power system requirements .The
digital excitation system is developed from the digital signal processor whichwill capture of variables, performs mathematical
operations and control algorithms and sends the control signals to the actuator. Automatic Voltage regulator (automatic/manual
control), over excitation limiter, Under excitation limité and volts/hertz limiter are included in this digital excitation system. The
exciter is controlled three phase SCR’s bridge
Index Terms: DIGITAL EXCITATION SYSTEM, Automatic Voltage Regulator, SCR Bridge, synchronous
generator,dsPIC30F4012.
-----------------------------------------------------------------------***-----------------------------------------------------------------------
1.INTRODUCTION
Microcontroller based automatic voltage regulator is used to
maintain the terminal voltage of the alternator constant from
no load to full load irrespective of power factor and frequency.
As the terminal voltage decreases depending on machine
reactance and load power factor. A suitable excitation control
is required to keep Alternator terminal voltage
constant.Industrial loads are always fluctuating and controlling
the excitation is difficult by manual operation. So suitable
automatic voltage regulator is required to change excitation at
a faster rate against quick changing loads.
Digital Excitation system panel senses the alternator terminals
voltage, varies the power fed to the alternator field to keep
terminal voltage constant irrespective of load conditions. This
is achieved by thyristor controlled rectifier where triggering
phase angle of the thyristor is varied by fast acting highly
sensitive solid state control circuit which works on close loop
principle.
The field of the alternator is fed from AC exciter and rotating
rectifier. The AC exciter field is controlled from AVR panel.
The AVR panel is having auto and manual channel. They
have separate control circuit, whereas power circuit is
common, hence when auto channel is workingit can be
transformed to manual channel without disturbing the load.
The manual channel is controlled by follow up circuit while
system is operating in auto channel.The follow up unit sense
the output reference of auto channel and gives signal to Digital
Reference Unit (DRU) of the manual channel to maintain the
same reference of auto channel.The power circuit consists of
half controlled full wave thyristor rectifier bridge. The
dsPIC30F4012 will control the firing angle of the thyristors
which control the power fed to the field, overexcited as well as
the under excited condition of the generator by adjusting the
firing angle. So, the software embedded in the microcontroller
helps to maintain fixed terminal voltage, logical operations of
the generator, protection of generator and to maintain the
constant power factor by adjusting the firing angle of the
thyristors.
2. SYNCHRONOUS GENERATOR
2.1 PRINCIPLE OF OPERATION
A synchronous generator is universally employed for the
generation of three phase power at all generating stations. The
largest–sized electrical machines are polyphase synchronous
generators. Under steady-state conditions, the operating speed
of a synchronous machine depends on the frequency
ofarmature currents and the number of field poles and is given
by
Where,
P= number of field poles
N= rotor speed in rpm (Synchronous speed)
F=frequency of armature currents.
120
NP
F
2. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 770
Fig.1. Synchronous machine construction and three phase
voltage generated at the terminals of generator
For the successful operation, the rotational speed of the
synchronous machine must synchronize with the frequency of
the energy system that meansthe stator flux and rotor flux
should get tightly bounded and the value of slip should be
zero. For production of torque the relative velocity between
the interacting stator and rotor fields must be zero.
When a synchronous generator is excited with field current
and driven at constant speed, balanced voltage is generated
in the armature winding. If balanced load is connected across
armature winding, balanced armature current at the same
frequency as the e.m.f will flow. Since the frequency of
generated e.m.f is related to the rotor speed, while the speed of
the armature rotating m.m.f is related to the frequency of the
current, it follows that the armature m.m.f rotates
synchronously with the rotor field. An increase in rotor speed
results in a rise in the frequency of e.m.f and current, while the
power factor is determined by the nature of the load.
Fig.2a. Equivalent circuit and phasor diagram for R load
Since the armature mmf rotates at the same speed as the main
field, it produces a corresponding e.m.f in the armature
winding. The effects of armature reaction and armature
winding leakage are considered to produce an equivalent
internal voltage drop across the synchronous reactance Xs,
while the field excitation is accounted for by the open-circuit
armature voltage Ef. The impedance Zs= (R+jXs) is known as
the synchronous impedance of the synchronous generator,
where R is the armature resistance.
For steady-state performance analysis, the per-phase
equivalent circuit shown in Figure 2 is used.
The synchronous generator, under the assumption of constant
synchronous reactance, may be considered as represent able
by an equivalent circuit comprising an ideal
3. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 771
Fig.2b. Equivalent circuit and phasor diagram for R-L load
Winding in which an e.m.f. Et proportional to the field
excitation is developed, the winding being connected to the
terminals of the machine through a resistance ra and reactance
(Xl + Xa ) = Xs all per phase. This is shown in Fig.2. The
principal characteristics of the synchronous generator will be
obtained qualitatively from this circuit [1, 3, 6].
2.2 GENERATOR LOAD CHARACTERISTICS
On open circuit the terminal voltage V is the same as the open
circuit e.m.f. Et .Suppose a unity-power-factor load be
connected to the machine. The flow of load current produces a
voltage drop IZs in the synchronous impedance and terminal
voltage V is reduced. The terminal voltage is obtained from
the complex summation
t SV E IZ
Fig.2c. Generator load characteristics
Algebraically this can be written
2 2 2
( )t s rV E I X I
for non-reactive loads. Since normally r is small
compared with Xs
2 2 2 2
.s tV I X E const
so that the V/I curve is as given below[6].
2.3GENERATOR EXCITATION FOR CONSTANT
VOLTAGE
Since the e.m.f. Et is proportional to the excitation when the
synchronous reactance is constant, the Eqn.
2 2 2
( cos ) ( s )tE V Ir V in IXs
can be applied directly to obtain the excitation necessary to
maintain constant output voltage for all loads. All unity-and
lagging power-factor loads will require an increase of
excitation with increase of load current, as a corollary of Fig.3.
Low-leading-power-factor loads, on the other hand, will
require the excitation to be reduced on account of the direct
magnetizing effect of the zero- power-factor component.
Fig.3. Generator excitation for constant voltage
The voltage-regulation of a synchronous generator is the
voltage rise at the terminals when a given load is thrown off,
the excitation and speed remaining constant.The voltage-rise
is clearly the numerical difference between Et and V, where V
is the terminal voltage for a given load and Et is the open-
circuit voltage for the same field excitation.Expressed as a
fraction, the regulation is[6]
( )tE V
perunit
V
3. PROPOSED SCHEME:MICROCONTROLLER
BASED AUTOMATIC VOLTAGE REGULATOR
As the automatic voltage regulator (AVR), which regulates
generator voltage, is a device indispensable for operation, it is
required to have superior reliability in addition to easy
maintenance or repair features. And, recently there exists an
ever-increasing demand for improved system stability through
the excitation control (AVR) in order to prevent decline in
system stability in line with the increase in power system and
power re-routing. At the same time, digital devices as
represented by micro-controllers have been making a
remarkable progress. The digital excitation systems are
achieving, high reliability, easy-operation, and easy
4. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 772
maintainability plus improved space factor. The main
components of the digital excitation system include:
a] A.C.EXCITATION UNIT
b] ROTATING DIODE or ROTATING RECTIFIER
c] MAIN SYNCHRONOUS GENERATOR
d] MICROCONTROLLER UNIT [dsPIC30F4012]
e] 3-PHASE FULLY BRIDGED THYRISTOR BRIDE
f] ZEROCROSSING DETECTOR
The digital automatic voltage regulator is needed to control the
voltage and the reactive power of the generator. The main
tasks of the regulator are to control the voltage in the steady
state, regulate the voltage under fault conditions and to
facilitate reactive power load-sharing between generators in
parallel operation. The voltage control is used in generators in
island mode operation or in parallel operation with weak
networks. Power factor is controlled in case the generator is
operating in parallel with a strong network. In case of voltage
control, the reactive power sharing between generators can be
controlled additionally by using a reactive droop
compensation method in which the voltage is lowered in the
generator from which the reactive current flows. This lowers
the need for excitation and thus also the reactive current. The
simplest analog automatic voltage-regulator solutions only
control the excitation current in load operation. In more
complex digital regulators, the control functions usually
include power factor control, generator soft start capability,
over-voltage and under-frequency protection, under- and over
excitation current limitation and voltage matching before
synchronizing. The D-AVR supplies and controls the current
in the field winding of the exciter to provide the needed
excitation current to the field winding in the rotor. The
excitation is controlled typically by means of a PID control
algorithm and a diode-bridge rectifier fed switch-mode power
supply or a thyristor-bridge rectifier. The diode bridge rectifier
is a line-commutated converter in which the firing of the
diodes depends only on the line voltage. The Thyristor Bridge
is a self-commutated converter, and the thyristors must be
fired to conduct the current. Typically, Digital automatic
voltage regulators can be supplied by either single or three
phase AC voltage or DC voltage. However, the excitation
current output from the regulator may be limited to a value
lower than the rated value when supplied with single-phase
voltage. A higher current can be achieved with a single-phase
supply by installing an external rectifier and a capacitor on the
D-AVR mounting plate. In no-load operation, the D-AVR
must provide a sufficient field current for the Generator to
produce the rated voltage at the rated speed. From no-load to
full-load operation, the excitation current must be increased to
compensate the effects of the armature reaction. In a generator
short circuit, the D-AVR cannot limit the excitation current
and all the power fed to the AVR is used in excitation. Thus
the excitation current must be limited by other means in order
to reduce the generator short-circuit current. This can be done
by using a separate excitation current limiter. Voltage and
current transformers are needed to measure the instantaneous
values of the main voltage and current to enable the voltage
regulation. As the load current increases, the armature reaction
reduces the air-gap flux and a voltage drop occurs in the
terminals of the generator. The AVR must increase the
excitation current to compensate the armature reaction and the
voltage drops caused by the reactance’s of the machine. The
microcontroller based automatic voltage regulator. In
Microcontroller based Automatic Voltage Regulating system
the terminal voltage from the synchronous generator is fed to
the dsPIC[8]. The dsPIC30F family of devices includes
peripherals that are ideally suited for power control
applications. These peripherals include a high-resolution
PWM module, a 10-bit 2 Msps Analog-to-Digital Converter
module and an Analog Comparator module. The software
embedded in the dsPIC calculates the firing angle and fires the
thyristor bridge in such a way to maintain the terminal voltage
to a referred value. On calculating the firing angle over
excitation limit, under excitation limit, power factor and
synchronized operation of the generator has to be maintained.
Terminal voltage and current is fed to the dsPIC with the help
of PT and CT and the power factor is also fed to the IC with
the help of the timing circuit. Terminal voltage is stepped
down in the range of 0-5v and fed to the IC with the help of
zero crossing detectors [2,4,5,7].
3.1 SYNCHRONISED WORKING OF
GENERATOR
While generator running in parallel with grid the excitation
has to be properly matching may lead to undesirable reactive
loads which may overload alternator an utility factor become
very poor. In case of alternator operating with grid, it has to
run at a constant power factor to meet EB requirement. And
also to maintain the ratio of active and reactive power
irrespective of grid voltage variation to get optimum
utilization. The power factor controller sense the power factor
of the alternator, compare with the reference set and correct
excitation through digital reference unit [DRU].To avoid
oscillation in correction, a dead band setting pot is also given
to adjust the dead band, depending on the fluctuation of the
bus voltage. Two pots are provided to adjust on time of the
rise pulse and on time of lower pulse. Power Factor control by
using separate power factor controller unit which corrects the
excitation parameters through Digital Reference Unit while
operating parallel with grid .Follow up unit is provided to
follow the auto channel and gives corrective signals to the
manual channel. During external fault conditions automatic
change over from auto to manual takes place without
disturbing the load conditions. After rectification of the fault,
change over from manual to auto is possible. That is to change
from manual to auto without disturbing the load conditions;
manually we have to set the reference of auto channel equal to
the manual channel[9].
5. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 773
3.2 UNDER/OVEREXCITED CONDITION OF
SYNCHRONOUS GENERATOR
During generator operation, it is necessary to observe the
permissible combinations of active and reactive power, which
can be seen from the capability diagram. Limiters employed in
the digital excitation system limits the dangerous operation of
the generators, which can cause damages as overheating, over
fluxing and loss of synchronism. The limiters take the
operating point to a state inside of the limits of machine’s
capability. Limiters can be over excitation limiter, under
excitation limiter, overvoltage limiter, over current limiter,
voltage/frequency limiter although they can include some
others for example the power factor limiter and reactive power
limiter. For this application the over excitation limiter, under
excitation limiter and V/Hz limiter were developed in the
DSP.The under excitation limiter corrects the reactive power
by raising the machine voltage as necessary to ensure that, in
case of an excursion beyond the limit characteristic, the
operating point is returned to that characteristic before the
machine is tripped by the under excitation protection.
The over excitation limiter ensures that, in the overexcited
range, the operating point always keeps within capability
curve section of the generator. In response to system voltage
drops caused by high reactive power requirements, switching
manipulations or faults, the voltage regulator raises the
excitation level so as to keep the generator voltage constant.
The over excitation limiting device acts as a safeguard against
thermal overloading of the rotor.
Fig.4. Possible Design of the Generator Capability Diagram
The over excitation limiter admits excitation current values
between The maximum continuous current and the maximum
excitation Current (field forcing) for a limited period of time
so that the Generator can back up the system in response to
short-time system Voltage dips. The secondary excitation
current limiter (field-forcing limiter), in contrast, has the task
of limiting the excitation current to the maximum permissible
value as quickly as possible. The stator current limiter ensures
the delayed limitation onto working points, within the N-P
range of the generator power diagram. The main task of the
stator current limiter is to prevent the generator stator from
thermical overload, whichcan be caused by a high reactive
power at increased active power.
Fig.5. Possible Design of the Generator stability Diagram
The stator current limiter also permits increased excitation
values for a limited period so that the generator can back up
the system.The over excitation limiter prevents an overheating
in the machine’s field winding. The under excitation limiter
avoids the machine loss of synchronism or avoids an
overheating in the stator end region. The volt/Hertz limiter
receives the terminal voltage and its frequency as input
signals, and protects the synchronous machine and
transformers connected to it damages by conditions of over
flux. The over flux is caused due to a big relation between
voltage and frequency, caused for a suddenly frequency drop.
The control of the power factor is also important for the
stabilized working of generator.While generator running in
parallel with grid or with other alternators the excitation has to
be properly matched. Improper matching may lead to
undesirable reactive loads which may overload the generator
and utility factor becomes very poor. If the power factor is
properly balanced to load power factor for alternator running
in parallel the utilization of alternator is maximum. In case of
alternator operating with grid, it has to run at constant power
factor to meet EB requirement of maintaining the ratio of
active and reactive power irrespective of grid voltage to get
optimum utilization. The timing unit senses the angle between
voltage vector and current vector and this angle is fed to the
dsPIC as interrupts.[10]
6. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 774
4. FLOWCHART
MAIN
INITIALISE TEMPORARY REGISTERS
INITIALISE PORT B, C, D, E
INITILISE TIMER 1,
2, 3
LOAD FIRING
ANGLE
INITIALISE ADC
REGISTER
INITIALISE ADC RESULT
REGISTER FROM LOWEST
HARDWARE
INTERRUPT
TIMER
2
A
ENABLE RISE INT FOR INT FIRST
POSITION
VOLTAGE FEEDBACK ADC
CURRENT REFERENCE ADC
CURRENT FEEDBACK ADC
VOLTAGE REFERENCE ADC
A
YES
YES
NO
YES
CHECK THE
HIGHER LIMIT
[WITH IN
THEPRESCRIBED
LIMIT] .
NO
INCREMENT THE VALUE
OF FIRING ANGLE
NO
DECREMENT THE VALUE
OF FIRING ANGLE
CHECK
THE
LIMIT=ZER
O .
CHECK THE
LOWER
LIMIT [WITH
IN
THEPRESCRI
BED LIMIT]
.
NEGG
VOLTAG
E REF
-
VOLTAG
E FEED.
POS/0
B
Mai
n
DECREMENT THE
VALUE OF FIRING
ANGLE
CURRENT
REF.
-
CURRENT
FEED.
CHECK THE
LOWER
LIMIT
[WITH IN
THEPRESCRI
BED LIMIT]
.
NEG
NO
POS/0
YES
B
7. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 775
5. COMPLETE BLOCK DIAGRAM
8. IJRET: International Journal of Research in Engineering and Technology ISSN: 2319-1163
__________________________________________________________________________________________
Volume: 02 Issue: 05 | May-2013, Available @ http://www.ijret.org 776
CONCLUSIONS
The digital excitation system developed by DSPIC. The
structure utilized for the task execution allowed a good
performance of the system dynamics.
Manual and auto control functions using proportional action
and proportional integral action were enough for obtaining fast
response speed and a zero state stationary error. The over
excitation limiter implemented using a first order dynamics
permits that the limiter operates faster when previous over
excitation levels are high; on the other hand the hysteresis
zone avoids oscillations around the limit point when the
limiter is given back to zero.
The under excitation limiter presets a good performance,
however oscillations around the operation limit zone were
observed, because its structure moved the generator operation
point to the limit line. The operation of the v/hz limiter was
adequate; when is presented a relation between
voltage/frequency on top of 1.05 pu decreased the voltage in
the same proportion that the frequency drops, avoiding an
excessive overflux. Future implementations require to reject
the oscillations presented on the under excitation limiter and
the overshoots in the voltage/frequency limiter. Thus by
employing under excitation as well as over excitation limiters
an efficient and a balanced calculation of the firing angle can
be obtained from the DSPIC 30F 4012nd fed to the thyristor
bridge.
REFERENCES
[1]JB Gupta, “Theory and performance of Electrical
Machines”, S.K. Kataria and Sons publishers, Fourteen
Edition.
[2]Dr. P. S. Bimbra, “Generalized Theory of Electrical
Machines” Khanna publishers, Fifth Edition.
[3]. R.Krishanam, “Electric Motor drives Modelling, analysis
and control”, PHI-India-2009
[4].Orozco, M. L.; Vasquez, H., "Dynamic performance of an
excitation system built in a digital way," Industrial Electronics
and Control Applications, 2005. ICIECA 2005
[5] Juan Dixon (Ph.D.), “three phase controlled rectifiers”,
Department of Electrical EngineeringPontificia Universidad
Católica de ChileVicuña Mackenna 4860 Santiago, CHILE.
[6] Prof. Krishna Vasudevan, Prof. G. SridharaRao,Prof. P.
SasidharaRao” Electrical Machines II”Indian Institute of
Technology Madras.
[7] http://operation of three phase thyristor bridge rectifier
service.eng.uts.edu.
[8]http://microchip.com/dspic30f4012/datasheet.
[9] http://WWW.abb.com/motor&drives.
[10] Dr. Hans-Joachim Herrmann, “Under excitation
Protection”, Power Transmission and Distribution, Siemens,
2007.
BIOGRAPHIES:
Sreehari S received the B.Tech
degree in Electrical & Electronics
Engineering from Calicut
University Institute of Engineering
&Technology, under University of
Calicut Kerala, India, in 2010 and
currently doing M.Tech in Power
Electronics in Amrita
vishwavidyapeetham, Coimbatore,
India. He has published papers in
various international Journals. His research interests
Multilevel inverter structures, renewable energy technologies,
electric drives and control and Excitation systems.
Deepak C R received the B.Tech
degree in computer science from
university of Calicut, Kerala, India, in
2011and currently doing M.Tech in
computer vision and image processing
in Amrita vishwavidyapeetham
university, Coimbatore, India. He has
published papers related to image
processing and electrical engineering
in various international journals. His
research interests include content based video/image retrieval,
document image analysis,digital image watermarking and
computer vision.