直驱永磁风力发电系统双PWM变流器控制技术

Control Technology of Dual PWM Converter for Direct-drive Permanent Magnet Wind Power System

在风力发电系统中,变流器是实现能量高效、稳定转换的关键。研究了直驱永磁风力发电系统的控制原理,建立了双PWM变流器机侧和网侧的数学模型。机侧变流器采用转子磁场定向矢量控制方式,网侧变流器采用电网电压定向矢量控制方式,实现有功和无功功率的完全独立解耦控制。仿真和试验结果表明:该控制策略可有效地实现最大风能捕获,维持直流母线电压稳定,实现发电机组的平滑并网,具有良好的动态响应。

In wind power generation system,the converter is the key to achieve energy efficient and stable conversion. The control principle of direct- drive permanent magnet wind power generation system is studied,the mathematical model of stator side and network side of dual PWM converter are established in this paper. The vector control method based on rotor magnetic field oriented is adopted in generator side converter,and power grid voltage oriented is adopted in network side converter. Then,the completely independent decoupling control of active and reactive power is achieved. The results of simulation experiment show that proposed control strategy can effectively realize maximum wind energy capture,smooth grid- connection of generator unit,stable DC bus voltage and good dynamic response.