永磁直驱风电全功率变流器并联控制方法研究

为提高永磁直驱风电全功率变流器并联控制效果，提出永磁直驱风电全功率变流器并联控制方法研究。首先分析永磁直驱风电全功率变流器拓并联扑结构，建立永磁直驱风电全功率变流器模型，计算无功功率受有功功率波动造成电压幅值产生波动，结合虚拟阻抗使功率在此种情况下耦合，系统总电阻补偿至0时，实现永磁直驱风电全功率变流器并联控制。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，验证了该方法的控制性能。

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

In order to improve the parallel control effect of permanent magnet direct drive wind power full power converter, the parallel control method of permanent magnet direct drive wind power full power converter is proposed. Firstly, the topology parallel topology structure of permanent magnet direct drive wind power full power converter is analyzed, and the model of permanent magnet direct drive wind power full power converter is established. The voltage amplitude fluctuation of reactive power caused by active power fluctuation is calculated. Combined with virtual impedance, the power is coupled in this case. When the system total resistance is compensated to 0, the parallel control of permanent magnet direct drive wind power full power converter is realized. The experimental results show that the fluctuation of the circulating current at the generator side and the circulating current at the grid side of the parallel operation of the permanent magnet direct drive wind power converter controlled by this method are relatively stable, which verifies the control performance of the method.