Voltage Control of Variable Speed Induction Generator Using PWM Converter
The paper describes a simple control structure for a stand-alone Induction Generator (IG) used to operate under variable speeds. PI and Fuzzy Logic Control (FLC) has been developed to automatically vary the duty-cycle of the PWM converter such that to maintain the DC-link voltage constant. The required reactive power for the variable-speed IG is supplied by means of the PWM converter and a capacitor bank to build up the voltage of the IG without the need for a battery and to reduce the rating of the PWM converter with the need for only three sensors. This proposed scheme has been used efficiently for variable speed wind or hydro energy conversion systems. The measurements of the IG system at various speeds and loads are given and show that this proposed system is capable of good DC voltages regulation. The proposed system has been simulated using MATLAB-SIMULINK software and verified the theoretical analysis.