FUZZY LOGIC BASED VOLTAGE CONTROL OF A SELF EXCITED INDUCTION GENERATOR DRIVEN BY A VARIABLE SPEED WIND TURBINE

Document Type : Original Article

Authors

Elechicul Engineering DepurIment Faculty ofEngineering-Minoufiya Universify-Egypt

Abstract

This paper presents a novel fuzzy voltage controller for a stand-alone three-phase self-excited
induction generator (SEIG) driven by a variable speed wind turbine. The generated voltage of the
SEIG is regulated by adapting the value of excitation capacitance against wind speed and load
variations using a fixed capacitor bank and a PWM current controlled voltage source inverter (CC￾VSI) with a single capacitor on its DC side. The proposed control scheme consists of two ky
logic PI controllers and one hysteresis current controller (HCC). Fuzzy logic based voltage control
of the SEIG helps to enhance its performance due to its non-linear adaptive gains, which are varied
on-line as the system operating point changes. The need for adaptive regulating scheme comes
!?om the fact that the wind turbine operates over a wide range of operating conditions and
therefore the system is highly non-linear. A complete mathematical model of the system is
developed in order to study its performance with the proposed controller. Simulation results using
Matlab/Simulink software program demonstrate the effectiveness of the proposed controller in
regulating the generated voltage of the SEIG against wind speed and load variations.

Keywords

ERJ. Engineering Research Journal
Volume 31, Issue 2
April 2008
Pages 129-139

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