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Fuzzy Logic Control Strategy for Stand-Alone Self-Excited Induction Generator for a Variable Speed Wind Turbine

M. Prabhu Raj, Dr. K. Ranjith Kumar

This paper presents a control strategy for the operation of a Self Excited Induction Generator (SEIG) based stand-alone variable speed wind turbine. To extract maximum energy form the generator and to regulate the terminal voltage of the generator a control strategy is present. In this system there is no grid connection, only stand-alone system is present. The topology of the system consists of a three phase squirrel-cage induction machine connected to a wind turbine through a step-up gear box, Pulse Width Modulation (PWM) Current Controlled Voltage Source Inverter (CC-VSI), Electronic Load Controller (ELC), three fuzzy logic PI controllers and one Hysteresis Current Controller (HCC). A dump-load resistance with IGBT chopper control and the dc link voltage is present to consume the maximum output power from the generator. Dynamic and steady-state performance where simulated using Matlab/Simulink software