Inverter supplied voltage control system for an isolated induction generator driven by a wind turbine

This paper deals with a technique to control the voltage generated from an isolated three-phase induction generator excited by an inverter and a single DC capacitor for use in a remote area power supply. The speed of the wind turbine that drives the induction generator could be regulated or unregulated. During the voltage build up process there is a variation in the flux linkage of the induction generator. The variation of magnetising inductance is taken into account due to saturation of the core. The terminal voltage of the induction generator is controlled using the vector control technique when the electrical load and rotor speed are varied within a specified range. The output voltage is regulated by varying the flux in the induction generator when the rotor speed is varied. A DC load is connected directly across the DC capacitor and an AC load can be fed by a load side inverter that supplies constant voltage and frequency.