Variable Speed Wind Turbine Using the Squirrel Cage Induction Generator with Reduced Converter Power Rating for Stand-Alone Energy Systems

AbstractThis paper presents a new configuration for awind energy conversion system (WECS) with variable speed,using a squirrel cage induction generator (SCIG) for standaloneenergy system applications. The Proposed configurationutilizes converters with reduced power rating, operates withMPPT to maximum wind energy extraction, uses battery bankfor energy storage and can operate with non-linear andunbalanced loads. Energy storage characteristic is desirable forwind energy conversion systems isolated from the mains since anenergy interruption does not stop of the entire system. Also, thepower rating of the converters is reduced compared to thegenerator and load power rating due to the low powerrequirements of the power converters to SCIG excitation controland to supply the load. It is presented also the whole proposedWECS and the system operation modes according the turbinespeed. It is presented also the whole proposed system and thesystem operation modes according the turbine speed. Thesimulation of the proposed WECS is performed in conjunctionwith the dynamic wind turbine model of 1 kW and the resultsconfirm the effectiveness to supply unbalanced and non-linearloads, the converters power rating reduction and operation withvariable turbine speed. Simulation results show the effectivenessof the system to supply unbalanced and non-linear stand aloneloads8 Halama