Improved load-adaptive control strategy for PMSG based stand-alone wind energy generation system

This paper presents a novel load-adaptive control strategy for stand-alone wind energy generation system using a permanent magnet synchronous generator (PMSG). Since there is no grid supply in a stand-alone system, the output voltage has to be controlled in the constant amplitude and frequency by the load-side PWM converter. To improve the operation performance under the nonlinear load and the unbalanced load, a SVM based predictive current control technique is adopted in the inner-loop current controller to improve the performance of transient response, and a outer-loop voltage controller based on the proportional integral plus resonant (PI+R) technique is used to control the amplitude and frequency of the output voltage. Simulation results demonstrate that, by using the proposed new scheme, the stand-alone wind generation system is capable to provide the excellent output voltage performance under both of the steady-state and dynamic process with the load-adaptive ability.