Voltage control and maximum power tracking of DFIG based wind power generator

Abstract

Renewable energy systems become more present in the energy market and wind power has already proven it's potential. The offshore wind farms have also been continuing its growth rapidly due to much better wind conditions like onshore wind farms. The studied system here is a variable speed wind generation system based on Doubly Fed Induction Generator (DFIG). In this topology, stator side converter and rotor side converter is used to implement the DFIG control to achieve wind power conversion. Here, a maximum power control strategy is incorporated with the DFIG, whereby the produced power serves as the active power reference for the DFIG. Stator flux oriented vector control is applied to decouple the control of active and reactive power generated by the DFIG based wind turbine. A DC/DC boost converter is used for DFIG system to DC grid connection. This system represents transferring offshore wind power to the terrestrial ac grid through the High Voltage DC (HVDC) network. The details of the control strategy and system simulation results in Simulink are presented in the paper.