Coordinated controller design of PMSG-based wind turbine using response surface methodology and NSGAII

SUMMARY This paper presents an optimum design procedure for the coordinated tuning of machine side converter (MSC) and grid side converter (GSC) controllers of permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS). The MSC and GSC controller parameters are determined by simultaneously optimizing the performance indices. The performance indices considered are maximum peak overshoot (MPOSω) and settling time (Tssω) of the generator speed and the maximum peak overshoot (MPOSVdc), maximum peak undershoot (MPUSVdc) and settling time (TssVdc) of DC-link voltage. The coordinated controller design is carried out in two steps. The first step is to arrive at the analytical expression that relates the performance indices and the controller parameters. This is achieved using response surface methodology. In the second step, the determination of controller parameters is posed as a constrained multi-objective optimization problem. The constrained multi-objective optimization problem is solved using non-dominated sorted genetic algorithm II. The proposed methodology is tested on a sample system with PMSG-based WECS, and results are compared with conventional and genetic algorithm-based design techniques. Simulation results demonstrate the effectiveness of the proposed methodology. Copyright © 2014 John Wiley & Sons, Ltd.