基于虚拟同步的永磁风力电机组并网下频率调节研究

Research on Frequency Regulation of Permanent Magnet Wind Turbine Under Grid Connection and Based on Virtual Synchronization

为了提高永磁同步风力电机组在并网下的稳定性,引入新的控制参数实现系统频率无差调节。分析VSG控制方法在电网侧变流器的控制作用,并进行仿真验证。研究结果表明:直流母线电压与350 V设定值保持良好跟随性,获得了稳定的直流电压。采用VSG控制方式时电机转速发生了更明显下降,因此能够更高效地满足频率变换要求。提出的频率调节方案能够有效改善系统频率的动态性能,提高了频率稳定性,对加强永磁风力电机组工作效率以及运行稳定性具有一定的理论支撑作用。

In order to improve the stability of permanent magnet synchronous wind turbines under grid connection,new control parameters were introduced to realize the non-difference adjustment of the system frequency.The VSG control method was used in the analysis of the control of grid-side converter,and then the simulation verification was carried out.The research results show:the DC bus voltage keeps a good follow ability with the 350 V setting value,and a stable DC voltage is obtained.When the VSG control method is adopted,the motor speed has been reduced more obviously,so it can meet the frequency conversion requirements more efficiently.The proposed frequency adjustment scheme can effectively improve the dynamic performance of the system frequency,improve the frequency stability,and make a certain theoretical support for enhancing the working efficiency and operational stability of permanent magnet wind turbines.