风力发电系统稳定性研究与分析

Research and Analysis on Stability of Wind Power Generation System

近年来,风力发电系统已得到广泛应用。但由于受到风向、风速及一些外界不稳定因素的影响,风力发电系统存在发电不稳定、设备寿命缩减等缺点,极大地影响了电能质量。通过分析影响风力发电的因素,对风力发电系统进行建模,找出了外界影响发电系统参数变化的因素,设计了混合动力发电机系统。通过将一个整流器和一个直流(DC)转换器与DC总线连接,多极永磁同步发电机(MPMSG)允许无齿轮耦合至涡轮机,从而提高风力发电系统的鲁棒性和稳定性。采用MATLAB软件建立系统仿真模型,通过零极点分布图和奈奎斯特图,对系统进行稳定性分析及仿真类比。试验结果表明,该方案能很好地维持系统的稳定,达到了预期结果。

Wind power generation systems have been widely used in recent years,but due to the impacts of wind direction,wind speed and some external factors of instability,as a result,wind power generation systems have the disadvantages of unstable power generation and reduced equipment life,which greatly affect power quality. The factors that affect the wind power generation are analyzed,modeling of the wind power generation system is performed,and the influence of external factors on the change of parameters of the power generation system is found out. The hybrid power generator system is designed,by connecting a rectifier and a DC converter to the DC bus,with a multi-pole permanent magnet synchronous generator（ MPMSG） to allow gearless coupling to the turbine,to achieve the robustness and the stability of the wind power generation system. The system simulation model is built with MATLAB software. Through the pole-zero distribution and Nyquist plots,the stability analysis and simulation analogy of the system are conducted. The result of test shows that the scheme can well maintain the stability of the system and achieve the expected results.