A Robust Active and Reactive Power Control Scheme With Multiloop Disturbance Rejection for a Wind Energy Conversion System

In this paper, a new control scheme is proposed to regulate the active power and reactive power of a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). Due to uncertainties in the internal dynamics of PMSG, modeling error in WECS and external disturbances, such as wind speed variation, control of active power, and reactive power, of a WECS becomes a challenging task. To address the above-mentioned problem, we propose a multiloop active disturbance rejection control (MADRC) approach to achieve efficient control of active and reactive power flow between the WECS and grid. The performance of this proposed control scheme is verified first by simulation and then, through experimentation on a 1-kW PMSG-based WECS developed in our laboratory. From the obtained simulation and experimental results, it is observed that the proposed MADRC provides excellent active and reactive power controls in the face of parametric variations and disturbance with satisfactory steady-state and dynamic performances. Further, on comparing its performance with that of a single-loop active disturbance rejection control and H
_∞
controller, it is found that MADRC exhibits superior active and reactive power control performances amongst aforesaid controllers.