Control strategy study of direct-driven wind-power system with PMSG based on back-to-back PWM converter

CHI Wei1， SHI Qing-jun2， CHEN Hong-wei2， MA Zhi-quan1
（1. Zhejiang Electric Power Test and Research Institute， Hangzhou 310014， China；
2. College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： Aiming at the control of direct-driven wind-power system with permanent magnet synchronous generators（PMSG） based on back-to-back PWM converter， the control strategies of generator-side converter and grid-side converter were analyzed in detail， and a control strategy of pitch angle was presented. A simulation for direct-driven wind-power system with PMSG using Matlab/Simulink was implemented. The simulation results show that direct-driven wind-power system with PMSG can operate stably under different wind speed， while it can achieve maximum power point tracking for wind energy under rated wind speed and limit the output power of wind-power system to rating power by pitch angle control. The results prove that the proposed control strategy of pitch angle is correct and viable.
Key words： back-to-back PWM converter； permanent magnet synchronous generators（PMSG）；direct-driven wind-power system with PMSG； pitch angle control； simulation