THREE-PHASE TO SINGLE-PHASE GENERATION SYSTEM BASED ON DOUBLY-FED INDUCTION GENERATOR

Abstract

– This paper presents a three-phase to single-phase six-leg converter for a wind energy conversion system based on Doubly-Fed Induction Generator (DFIG). The converter is composed of six legs and is divided in three parts: the grid-side converter (GSC), which is responsible for power factor and DC-link voltage controls, the stator-side converter (SSC), which guarantees the control of the stator voltage, and the rotor-side converter (RSC), which is responsible for vector control of the generator. One of the converter’s legs is shared by grid-side and stator-side converters. The main advantages of the proposed configuration compared to other topologies presented in the literature are providing balanced three-phase voltages to the DFIG, simple control system and not having any limitation with respect to synchronization between grid and stator voltages and DC-link voltage. The system model, pulse-width modulation (PWM) and control strategies are discussed and simulation and experimental results are presented in order to prove the feasibility of the system.