一种序分量检测新方法

针对传统dq变换法在检测电网序分量时的不足,提出了一种新的序分量检测方法,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,有效消除了PLL延时带来的影响;也不需要进行三角函数计算,降低了算法的复杂度.仿真分析表明,本文所提出的方法在电源电压不对称和畸变时能有效检测出负载电流的正序、负序和畸变分量.

A novel harmonic current detecting algorithm

To counter the shortages when using the traditional dq coordinate transformation method to detect sequence components,a new detection method which is suitable for both the unbalanced load system and the unbalanced source system is presented in this paper.The new method utilizes the single phase voltage to obtain the synchronous rotating angle without the need of circuit of Phase Lock Loop(PLL) to obtain synchronous rotating angle,so eliminates the influence brought by the time delay of PLL.Furthermore,the new method needn't to compute the trigonometric function too,so reduces the complexity.At last,the design procedure of the differential which is used in the new method is introduced in this paper.The simulation analyses results indicate that the proposed method has the characteristic of high precision and rapid response when detecting the positive sequence,negative sequence and distortion components of the load current under the unbalanced and distorted source voltage.