永磁直驱风电全功率变流器并联控制方法研究

Research on Parallel Control Method for Permanent Magnet Direct-drive Wind Power Full-power Converter

为提高永磁直驱风电全功率变流器并联控制精度,研究了永磁直驱风电全功率变流器并联控制方法。首先分析永磁直驱风电全功率变流器并联拓扑结构,建立永磁直驱风电全功率变流器模型,再计算无功功率受有功功率波动造成电压幅值产生波动,结合虚拟阻抗控制方法,实现对永磁直驱风电全功率变流器的并联控制。实验结果表明,采用该方法控制永磁直驱风电全功率变流器并联运行的机侧环流与网侧环流波动较为稳定,且环流控制精度较高,最高可达到99%,验证了该方法的控制性能。

To improve the parallel control precision of a permanent magnet direct drive wind power full-power converter,its parallel control method is studied.First,its parallel topology is analyzed,and its model is established.Then,the fluctuation of voltage amplitude caused by the fluctuation of reactive power due to the fluctuation of active power is calculated.Combined with the virtual impedance control method,the parallel control of the permanent magnet direct drive wind power full-power converter is realized.Experimental results show that the circulating current fluctuations on machine-and grid-side controlled by the proposed method in the parallel operation of permanent magnet direct drive wind power full-power converter were relatively stable,and the control precision of circulating current was as high as 99%,which verified the control performance of this method.