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Title: Active Power and Flux Control of a Self-Excited Induction Generator for a Variable-Speed Wind Turbine Generation

Abstract

A Self-Excited Induction Generation (SEIG) for a variable speed wind turbine generation(VS-WG) is normally considered to be a good candidate for implementation in stand-alone applications such as battery charging, hydrogenation, water pumping, water purification, water desalination, and etc. In this study, we have examined a study on active power and flux control strategies for a SEIG for a variable speed wind turbine generation. The control analysis for the proposed system is carried out by using PSCAD software. In the process, we can optimize the control design of the system, thereby enhancing and expediting the control design procedure for this application. With this study, this control design for a SEIG for VS-WG can become the industry standard for analysis and development in terms of SEIG.

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1365693
Report Number(s):
NREL/CP-5D00-68727
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 2017 Ninth Annual IEEE Green Technologies Conference (GreenTech), 29-31 March 2017, Denver, Colorado
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION; self-excited induction generation; active power; flux control

Citation Formats

Na, Woonki, Muljadi, Eduard, Leighty, Bill, and Kim, Jonghoon. Active Power and Flux Control of a Self-Excited Induction Generator for a Variable-Speed Wind Turbine Generation. United States: N. p., 2017. Web. doi:10.1109/GreenTech.2017.32.
Na, Woonki, Muljadi, Eduard, Leighty, Bill, & Kim, Jonghoon. Active Power and Flux Control of a Self-Excited Induction Generator for a Variable-Speed Wind Turbine Generation. United States. doi:10.1109/GreenTech.2017.32.
Na, Woonki, Muljadi, Eduard, Leighty, Bill, and Kim, Jonghoon. Thu . "Active Power and Flux Control of a Self-Excited Induction Generator for a Variable-Speed Wind Turbine Generation". United States. doi:10.1109/GreenTech.2017.32.
@article{osti_1365693,
title = {Active Power and Flux Control of a Self-Excited Induction Generator for a Variable-Speed Wind Turbine Generation},
author = {Na, Woonki and Muljadi, Eduard and Leighty, Bill and Kim, Jonghoon},
abstractNote = {A Self-Excited Induction Generation (SEIG) for a variable speed wind turbine generation(VS-WG) is normally considered to be a good candidate for implementation in stand-alone applications such as battery charging, hydrogenation, water pumping, water purification, water desalination, and etc. In this study, we have examined a study on active power and flux control strategies for a SEIG for a variable speed wind turbine generation. The control analysis for the proposed system is carried out by using PSCAD software. In the process, we can optimize the control design of the system, thereby enhancing and expediting the control design procedure for this application. With this study, this control design for a SEIG for VS-WG can become the industry standard for analysis and development in terms of SEIG.},
doi = {10.1109/GreenTech.2017.32},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 11 00:00:00 EDT 2017},
month = {Thu May 11 00:00:00 EDT 2017}
}

Conference:
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  • When an induction generator is connected to a utility bus, the voltage and frequency at the terminal of the generator are the same as the voltage and frequency of the utility. The reactive power needed by the induction generator is supplied by the utility and the real power is returned to the utility. The rotor speed varies within a very limited range, and the reactive power requirement must be transported through a long line feeder, thus creating additional transmission losses. The energy captured by a wind turbine can be increased if the rotor speed can be adjusted to follow windmore » speed variations. For small applications such as battery charging or water pumping, a stand alone operation can be implemented without the need to maintain the output frequency output of the generator. A self- excited induction generator is a good candidate for a stand alone operation where the wind turbine is operated at variable speed. Thus the performance of the wind turbine can be unproved. In this paper, we examine a self-excited induction generator operated in a stand alone mode. A potential application for battery charging is given. The output power of the generator will be controlled to improve the performance of the wind turbine.« less
  • This paper investigates a variable-speed, constant-frequency double output induction generator which is capable of absorbing the mechanical energy from a fixed pitch wind turbine and converting it into electrical energy at constant grid voltage and frequency. Rotor power at varying voltage and frequency is either fed to electronically controlled resistances and used as heat energy or is rectified, inverted by a controllable line-commutated inverter and returned to the grid. Optimal power tracking is by means of an adaptive controller which controls the developed torque of the generator by monitoring the shaft speed.
  • Self-Excited Induction Generation(SEIG) is very rugged, simple, lightweight, and it is easy and inexpensive to implement, very simple to control, and requires a very little maintenance. In this variable-speed operation, the SEIG needs a power electronics interface to convert from the variable frequency output voltage of the generator to a DC output voltage for battery or other DC applications. In our study, a SEIG is connected to the power electronics interface such as diode rectifier and DC/DC converter and then an electrolyzer is connected as a final DC load for fuel cell applications. An equivalent circuit model for an electrolyzermore » is utilized for our application. The control and analysis for the proposed system is carried out by using PSCAD and MATLAB software. This study would be useful for designing and control analysis of power interface circuits for SEIG for a variable speed wind turbine generation with fuel cell applications before the actual implementation.« less
  • The paper gives a mathematical analysis of the voltage build up of an induction generator, self excited by d.c. side capacitor connected through a modulated inverter. The load is assumed to be connected across the capacitor. The effect of variables like load resistance, capacitor value, slip and modulation index on the process of build up is studied. It is shown that the value of the capacitor affects the rate of build up and the steady state ripple voltage across the load. Also a minimum value of the capacitance is needed for self excitation. The results of the analysis clearly indicatemore » that it is possible to maintain constant d.c. voltage over a wide range of prime-mover speeds and loads by controlling the inverter frequency and the modulation index without changing the capacitor value.« less
  • The DOE/Sandia 34-metre VAWT Test Bed is a 500kW variable-speed wind turbine. The turbine is operated between 25 and 38 rpm and has been characterized from a structural and aerodynamic stand point. A preliminary variable speed control algorithm has been implemented on the Test Bed. This paper describes the initial variable-speed control algorithm developed for the Test Bed and the performance of that algorithm to date. Initial performance comparisons between variable-speed and fixed-speed operation are made as well as some thoughts on the expansion of the operating envelope of the Test Bed. 7 refs., 4 figs.