Variable-speed wind power generation using doubly fed wound rotor induction machine - A comparison with alternative schemes

Datta, Rajib and Ranganathan, VT (2002) Variable-speed wind power generation using doubly fed wound rotor induction machine - A comparison with alternative schemes. In: IEEE Transactions on Energy Conversion, 17 (3). pp. 414-421.

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Abstract

In this paper, a wind energy conversion system (WECS) using grid-connected wound rotor induction machine controlled from the rotor side is compared with both fixed speed and variable speed systems using cage rotor induction machine. The comparison is done on the basis of (I) major hardware components required, (II) operating region, and (III) energy output due to a defined wind function using the characteristics of a practical wind turbine. Although a fixed speed system is more simple and reliable, it severely limits the energy output of a wind turbine. In case of variable speed systems, comparison shows that using a wound rotor induction machine of similar rating can significantly enhance energy capture. This comes about due to the ability to operate with rated torque even at supersynchronous speeds; power is then generated out of the rotor as well as the stator. Moreover, with rotor side control, the voltage rating of the power devices and dc bus capacitor bank is reduced. The size of the line side inductor also decreasesd. Results are presented to show the substantial advantages of the doubly fed system.

Item Type:	Journal Article
Publication:	IEEE Transactions on Energy Conversion
Publisher:	IEEE
Additional Information:	Copyright 2002 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Rotor side control;subsynchronous and supersynchronous generation;variable speed constant frequency operation; wind energy conversion system;wind turbine;wound rotor induction machine.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	02 Aug 2011 08:35
Last Modified:	02 Aug 2011 08:35
URI:	http://eprints.iisc.ac.in/id/eprint/39652

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