Fuzzy-PI controller design for PM wind generator to improve fault ride through of wind farm

Abstract

This paper presents an application of Fuzzy-PI controller to current controller of voltage source converter based permanent magnet wind generator in order to improve Fault Ride through (FRT) capability of wind farm. Fuzzy logic controller is proposed to adjust PI controller gain parameters. Fuzzy rule base and the inference mechanism of the fuzzy logic controller (FLC) are designed based on gain and phase margin analysis plotted on the bode diagram characteristic. To evaluate the controller system capabilities, simulation analyses are performed on a model system composed of two wind farms connected to an infinite bus. Simulation results by PSCAD/EMTDC show that the proposed controller is very robust and effective to improve the FRT of wind farm during fault in the grid system.