基于双PWM变换器的永磁直驱风电系统控制策略研究

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

针对基于双PWM变换器的永磁直驱风电系统的控制问题,对该风电系统电机侧变换器、电网侧变换器的控制策略进行了详细的分析,提出了一种桨距角控制策略,并基于Matlab/Simulink对永磁直驱风电系统进行了仿真。仿真结果表明,永磁直驱风电系统能够在不同风速下稳定运行,在额定风速以下可实现风能的最大功率跟踪,在额定风速以上通过桨距角控制能将风机系统的功率输出限制在额定值附近。研究结果验证了所提出的桨距控制策略的可行性。

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.