Linear Active Disturbance Rejection Control for Dual-Stator Winding Induction Generator AC Power System

Abstract

In this article, a control strategy based on linear active disturbance rejection control (LADRC) is proposed for the dual-stator winding induction generator (DWIG) ac power system, in order to solve the problems of contradiction between tracking ability and dynamic performance with proportional-integral controller. Based on the rotor-flux-oriented coordinate system, the dynamic mathematic model of the output ac voltage of power winding (PW) is established. The load disturbance on the PW side and the variation of the system parameters are regarded as the total disturbance, which is observed and compensated by linear extended state observer (LESO) and linear state error feedback (LSEF), respectively. By analyzing the swiftness and disturbance-rejection ability with different bandwidths of LESO, the ac voltage LADRC controller is first designed for DWIG. The stability and performance analysis with different controller parameters is given and the robustness of the proposed controller under the parameter mismatch is investigated. Both simulation and experiments show that the proposed LADRC has a better tracking ability and dynamic performance. Moreover, the proposed LADRC also has strong robustness under the parameter mismatch.