Power Balance Theory Based Voltage and Frequency Control for IAG in Wind Power Generation

This paper deals with an application of the power balance theory in a voltage and frequency controller (VFC) of an autonomous wind power generation using an isolated asynchronous generator (IAG) feeding three-phase four wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage system (BESS) is used as a VFC for the power management of the wind energy conversion system (WECS). Bi-directional power flow capabilities of the proposed VFC in WECS are demonstrated through simulation results. The proposed VFC works as an IAG exciter, a voltage regulator, a load leveler, a load balancer and a harmonic eliminator in the WECS. The wind power driven IAG system is modeled and simulated in the MATLAB using the Simulink and the sim power system (SPS) toolboxes.