Operation and control of wind driven isolated asynchronous generator with a battery and a zigzag transformer

This work deals with the operation and control of a wind turbine driven isolated asynchronous generator (IAG) system to feed three-phase four-wire consumer loads. The voltage and frequency controller (VFC) of IAG consists of a three-leg voltage sourced converter (VSC) and a battery energy storage system. A zig-zag transformer is used to provide the neutral terminal for three-phase four wire consumer loads and to reduce the rating of the VSC. An instantaneous reactive power theory (IRPT) is implemented for the derivation of reference source currents using a DSP. The performance of VFC of IAG is demonstrated through extensive test results.