改进的双PWM型直驱永磁风电机组并网控制策略  

An Improved Grid-Connected Control Strategy of Double PWM Direct-Driven Permanent-Magnet Wind Turbines

作　　者：李慧[1] 范新桥[1] 范梦杨 LI Hui;FAN Xinqiao;FAN Mengyang(School of Automation,Beijing Information Science&Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学自动化学院,北京100192

出　　处：《电机与控制应用》2018年第8期98-103,109,共7页Electric machines & control application

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

摘　　要：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 direct-driven permanent-magnet synchronous wind turbine,the closed-loop transfer function of speed control for the generator-side PWM converter was deduced.As a non-origin closed loop zero exists in the transfer function,an improved PI control strategy was proposed to eliminate the non-origin closed-loop zero and to enhance dynamic characteristics under disturbances.Meanwhile,the idea was applied to the control of the grid-side PWM converter.The simulation results showed that the modified control strategy could reduce the overshoots of the dynamic responses in the generator-side and grid-side control systems,quicken dynamic response speed and improve the stability of grid-connected operation for the whole double PWM direct-driven permanent-magnet wind power generation system.

关 键 词：直驱永磁同步风力发电机 双PWM变流器 速度控制 并网运行 

分 类 号：TM315[电气工程—电机]