Active disturbance rejection control for stand-alone doubly fed induction generator

In this paper, a controller design method is proposed for stand-alone doubly fed induction generator (DFIG). This method is based on forced stator-voltage-oriented vector control principle and active disturbance rejection control (ADRC) approach. Specifically, the forced stator-voltage-oriented vector control principle is used to simplify the mathematics model of stand-alone DFIG and guarantee constant frequency. ADRC approach is used to obtain the constant amplitude of the stator voltage with the variable load. The proposed strategy has a good transient at the start-up and the load changes condition. Simulation results are given to illustrate the efficacy of the proposed method.

1 Introduction

In recent years, doubly fed induction generator (DFIG) is widely used for variable-speed wind power generation system because of its several advantages over other generator systems [1]–[2]. These advantages include ease of speed control, decoupled active and reactive power capability, and an inverter rated at approximately 20-30% of the total system power. Therefore the control of DFIG has become a very important research topic. The control and operation of DFIG systems have been primarily focused on grid-connected applications. However, in practice, there are many kinds of isolated loads such as remote villages, electric ships, military equipments, etc., which necessarily require a stand-alone generating system to supply power demand. Therefore, more and more attentions are paid to stand-alone operation of DFIG with isolated customer loads, in last decade.