CONTROL OF PWM CONVERTERS FOR PMSG WIND TURBINE SYSTEM UNDER GRID VOLTAGE DISTORTION

Abstract

This paper proposes a control method of pulse-width modulation (PWM) converters for permanent magnet synchronous generator (PMSG) small wind turbines under distorted grid voltages. The DC-link voltage can be controlled at the machine-side converter (MSC), while the grid-side converter (GSC) controls the grid active power for a maximum power point tracking (MPPT). With the proposed method, the control performance of the DC-link voltage is improved since it is not directly affected from the grid voltage distortion. Also, the grid current is controlled to be sinusoidal, based on the excellent proportional-resonant (PR) controllers. The validity of the control algorithm has been verified by the simulation of the 2.68 kW-PMSG wind turbine system.