Induction Generator in Wind Power Systems
( Induction Motors - Applications, Control and Fault Diagnostics )
Publication series ： Induction Motors - Applications, Control and Fault Diagnostics
Author： Yu Zou
Publisher： IntechOpen
Publication year： 2015
E-ISBN: INT5963760958
P-ISBN(Paperback): 9789535122074
P-ISBN(Hardback): 9789535122074
Subject： O441 electromagnetics
Keyword： 电磁学
Language： ENG
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Induction Generator in Wind Power Systems
Description
Wind power is the fastest growing renewable energy and is promising as the number one source of clean energy in the near future. Among various generators used to convert wind energy, the induction generator has attracted more attention due to its lower cost, lower requirement of maintenance, variable speed, higher energy capture efficiency, and improved power quality [1-2]. Generally, there are two types of induction generators widely used in wind power systems – Squirrel-Cage Induction Generator (SCIG) and Doubly-Fed Induction Generator (DFIG). The straightforward power conversion technique using SCIG is widely accepted in fixed-speed applications with less emphasis on the high efficiency and control of power flow. However, such direct connection with grid would allow the speed to vary in a very narrow range and thus limit the wind turbine utilization and power output. Another major problem with SCIG wind system is the source of reactive power; that is, an external reactive power compensator is required to hold distribution line voltage and prevent whole system from overload. On the other hand, the DFIG with variable-speed ability has higher energy capture efficiency and improved power quality, and thus dominates the large-scale power conversion applications. With the advent of power electronics techniques, a back-to-back converter, which consists of two bidirectional converters and a dc-link, acts as an optimal operation tracking interface between DFIG and loads [3-5]. Fie
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