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基于dq变换的三相电压暂降生成方法

, PP. 55-61

Keywords: dq变换,电压型变流器,电压暂降,电压暂降发生器

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Abstract:

提出了一种基于dq变换的三相电压暂降生成方法。采用“背靠背”(BacktoBack)双电压型PWM变流器构成三相电压暂降发生器的主电路,模拟无穷大电网在正常和各种故障情形下的电源特性。针对七种典型的电压暂降故障(包括对称、不对称不含零序以及不对称含零序三种情形下的所有电压暂降类型),在dq0同步旋转坐标系下应用对称分量法完成复合运算,并针对不对称含零序电压暂降情况对abc-dq0变换进行了算法修正,生成电压暂降的空间矢量脉宽调制控制信号。该方法生成的三相故障暂降电压自动满足相与相之间的相位关系和幅值关系,可以全面准确地生成公共连接点的故障电压,实现了电压跌落深度的全范围可调以及故障持续时间的任意设置。仿真和部分实验结果验证了该方法的合理性与可行性。

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