新型负序电流检测方法及其应用

Negative sequence current detection and its application

针对传统的基于同步旋转变换负序电流检测方法的一些缺陷,提出了一种新的检测方法,该方法不仅适用于负载不对称系统,而且适用于电源电压不对称系统。在检测过程中,不需要采用锁相环(PLL)电路获得同步旋转角,消除了PLL延时带来的影响。仿真结果证明了所提检测方法的正确性和有效性,新的负序电流检测方法具有精度高、实时性强的特点。最后,给出了所提方法在配电静止同步补偿器中的应用效果,表明采用所提的负序电流检测方法配电静止同步补偿器能很好地实现负载的不平衡补偿。

Aiming at the defects of traditional detection method based on dq transformation for unbalanced three, phase system,an improved method is proposed,suitable for both unbalanced load and source. It does not use PLL circuit to obtain synchronous rotate angle to get rid of the influence brought by the time delay of PLL. Simulative analysis and experimental result indicate its validity, with high precision and better real-time performance. Its application in distribution static synchronous compensator indicates that it realizes the compensation for unbalanced load.