在分析直驱永磁同步风力机速度环特性的基础上,推导出机侧脉宽调制(PWM)变流器速度控制环的闭环传递函数。由于该传递函数中存在非原点闭环零点,提出了一种改进的PI控制策略,消除了非原点闭环零点,改善了系统在受扰时的动态特性,提高了并网电流的波形质量,并将其策略应用于网侧PWM变流器的控制。仿真结果表明,改进的PI控制策略能够有效减少机侧和网侧控制系统动态响应时的超调量,加快系统响应速度,提高整个双PWM型直驱永磁同步风电系统并网运行的稳定性。

Based on analyzing the speed loop characteristics of directdriven permanentmagnet synchronous wind turbine, the closedloop transfer function of speed control for the generatorside PWM converter was deduced. As a nonorigin closed loop zero exists in the transfer function, an improved PI control strategy was proposed to eliminate the nonorigin closedloop zero and to enhance dynamic characteristics under disturbances. Meanwhile, the idea was applied to the control of the gridside PWM converter. The simulation results showed that the modified control strategy could reduce the overshoots of the dynamic responses in the generatorside and gridside control systems, quicken dynamic response speed and improve the stability of gridconnected operation for the whole double PWM directdriven permanentmagnet wind power generation system.

TM 315

北京市自然科学基金项目(3172015)；北京市教委科研计划项目(KM201711232008)