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Power Factor Improvement and Inrush Current Reduction of a Grid Connected Split-Phase Induction Generator
(2018-11-27)
Prapurt, N.
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Sawetsakulanond, B.
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Kinnares, V.
This paper proposes power factor improvement and inrush current reduction of a 1/2 HP, 220 V, 4.8 A, 4 poles single-phase grid connected split phase induction generator by connecting a capacitor for reactive compensation and a single-phase ac voltage controller for reducing inrush current during starting of the grid connected induction generator. Analysis and comparison of generator performance between calculation with an equivalent circuit and testing in a laboratory are given. Simulation of the generator operation during starting of connection with the power system using MATLAB/Simulink is also included. From testing results, it is found that the capacitor can improve power factor but it causes an increase in harmonic currents. Soft starting of the grid connected generator with the ac voltage controller offers a reduction in the peak inrush current with 75-80% of the peak inrush current with direct on line start. The simulation results using MATLAB/Simulink are in good agreement with testing and theoretical results. The research results are guidelines for single-phase grid induction generator applications in effective electricity production.
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Analysis and Investigation of the Islanding Phenomenon Problem for Grid Connected Induction Generators
(2018-11-27)
Sawetsakulanond, B.
;
Kinnares, V.
This paper proposes analysis and investigation of the islanding phenomenon of a three phase, 0.75 kW, 220/380 V, 3.46/2A, Δ / Y connected, 1400 rpm, 4 pole grid connected induction generator. Analysis and investigation on grid connected induction generators under transient and steady state conditions are given. Research results will be guidelines for islanding protection equipment of grid-connected induction generators.
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Analysis and investigation on the behavior and performance of single phase grid connected induction generators system
(2017-10-02)
Nuttapong, P.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents an inrush current reduction method for a 1/2 HP (0.4 kW), 220 V, 4.8 A, 4 poles single phase split-phase type induction generator when connected to a grid using single-phase voltage control with power electronic equipment. A study and analysis of relationship between voltage, current and real power by laboratory tests under direct on line and soft connection conditions are given. Simulation and experimental results are in good agreement. According to testing results, it is found that the proposed voltage control is able to reduce 75-80 % of the inrush current when starting the connection. Research results will be guidelines in applications of effective single-phase induction generators for wind energy.
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Investigation of skew effect on the behavior and performance of grid connected induction generators
(2017-01-30)
Sawetsakulanond, B.
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Kinnares, V.
This paper proposes the investigation of skew effect on the behavior and performance of three phase, 2.2 kW, 220/380 V, Δ / Y connected, 1420 rpm, 4 poles grid connected induction generators with skewed squirrel cage rotor for supplying electric power to utility grid. Skewed rotor with angle of 0°, 5° and 10° for grid connected induction generators are employed. Analysis and comparative study on operating of induction generators under transient and steady state conditions have been performed. Research results will be guidelines for an application of wind induction generator for electricity generation.
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Implementation of FPGA and real-time processor for islanding monitoring and protection of grid connected induction generator
(2017-01-30)
Buangam, W.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents new controller using FPGA and Real-Time Processor based on LabVIEW Programming that can be detected phenomena of Induction Generator (IG) isolated from grid. Advantage of controller can be monitoring voltage, current signal and reducing effect of buildup voltage of IG after disconnecting form grid system by connecting the impedance to IG terminal. The results demonstrate that the islanding detection succeeds and to prevent damage occurrence of IG.
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Performance evaluation of three-phase induction generator operating as grid connected single-phase induction generator using electronic capacitor
(2016-01-18)
Yukhalang, S.
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Sawetsakulanond, B.
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Kinnares, V.
This paper presents performance evaluation of three-phase induction generator operating as a grid connected single phase induction generator using electronic capacitor for variable speed wind energy applications. When the existing delta connected three-phase can operate as a single-phase induction generator by voltage control techniques using electronic capacitor. The proposed converter system for the front end converter, a single-phase full bridge IGBT converter offers bidirectional power flow for the machine operates as a motor and generator modes. For the machine end converter, half bridge IGBT converter offers excitation of the generator. Comparison between one capacitor connecting an external suitable across terminals and electronic capacitor will be given. Performance evaluation like electromagnetic torque, power factor, speed, THDi for both sides of the system for variable speed of a prime mover is given by simulation using MATLAB/Simulink.
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Performance evaluation of a single-phase grid connected induction generator
(2014-01-01)
Yukhalang, S.
;
Sawetsakulanond, B.
;
Kinnares, V.
This paper presents performance evaluation of a single - phase grid connected squirrel cage induction generator for variable speed wind energy applications. The existing delta connected three-phase induction generator can operate as a single-phase induction generator by connecting an external suitable capacitor across terminals. For the front end converter, a single-phase full bridge IGBT converter offers bidirectional power flow for the machine operates as a motor and generator modes. For the machine end converter, half bridge IGBT converter offers excitation of the generator. The performance evaluation like electromagnetic torque, speed, power factor etc. for variable speed of a prime mover is given. The correctness of the proposed system is verified by simulation using MATLAB/Simulink.
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Power supply for testing of induction motors and generators complied with IEEE std. 112-2004 for an energy conversion laboratory
(2014-01-01)
Sawetsakulanond, B.
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Kinnares, V.
This paper presents a power supply for testing a 5 kVA induction motor, which can be applied to testing of induction motors and generators complied with the IEEE Std. 112-2004. The power supply consists of a three-phase AC-DC rectifier, a DC filter and a 6-step inverter with a low pass filer providing nearly sinusoidal output voltages. The blocked rotor test has been conducted at 25 % rated motor operating frequency. The comparison between the conventional blocked rotor test and the proposed method of a 750 W three-phase induction motor is given. The obtained results can be used in research of energy conversion offering an energy reduction in the induction motor testing.
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Investigation of harmonic current of power system using static var compensator for grid-connected induction generators under condition of low wind speed
(2014-01-01)
Sawetsakulanond, B.
;
Kinnares, V.
This paper presents the investigation of harmonic currents of a power system associated with a static Var compensator for grid-connected induction generators under condition of low wind speed. The static Var compensator uses fixed capacitor and thyristor controlled reactor. The investigation of reactive power compensation for 2.2 kW, 220/380 V, 8.5/5.2A, Δ/Y, 4 P, induction generator has been performed under low wind speed and constant power factor at 0.9. The obtained results can be guidelines for harmonic mitigation of reactive power compensation for grid-connected induction generators inside a nation.
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Characteristic requirements of a small scale squirrel cage induction generator for effective electricity generation from wind energy
(2013-01-01)
Kinnares, V.
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Sawetsakulanond, B.
This paper proposes characteristic requirements of a small scale squirrel cage induction generator for effective electricity generation from wind energy. These characteristics are obtained from modeling and testing results. Investigation into comparative performances between Standard and high efficiency induction generators is given in order to find out the characteristic requirements of a suitable induction generator. Performances of various features of the machine structure are given. The suitable design of the induction generator based on empirical rules is also included. The investigation of power loss of the induction machine both in theory using FEM (Finite Element Method) and tests has been made. In addition, static var (Volt-Ampere reactive power) compensator using power electronic control to keep terminal voltage of a self-excited induction generator constant is explained. These results can be guidelines for machine development and control method for effective electricity generation. © 2013 The Authors. Published by Elsevier.

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