基于单相级联延时信号消除法的三相基波正序有功电流检测方法

A Method to Detect Three-Phase Fundamental Positive-Sequence Active Current Based on Single-Phase Cascaded Delayed Signal Cancellation

快速准确地检测基波正序有功电流,对电能质量控制非常重要。许多传统方法都需使用锁相环、低通滤波器或进行??和dq坐标变换。为此,提出了一种新型检测方法。首先通过扇合矢量变换,将三相系统的电压和电流归一化为单相系统;然后通过构造级联延时信号消除模块对基波正序电压和电流进行快速提取;最后通过简单的数学计算,得到基波正序有功电流。该方法既不需要锁相环,也不需要低通滤波器,还能够省略使用??和dq坐标变换时的复杂计算。仿真结果验证了所提方法的有效性。

It is very important for power quality control to detect fundamental positive-sequence active current rapidly and accurately. In traditional detection approaches many techniques such as phase locked loop（PLL）, low pass filter（LPF） or ？？and dq coordinate transforms are often integrated, however there are certain limitations in these approaches, for this reason, a novel detection method is proposed. Firstly, by means of fan-in vector transformation a three-phase system is normalized into single-phase system; then through constructing cascaded-delayed signal cancellation module, the fundamental positive-sequence voltage and current are extracted rapidly; finally, positive-sequence active current can be obtained by simple calculation. In the proposed method nor PLL neither LPF are needed, besides the complex computation during ？？and dq coordinate transformation can be omitted. The effectiveness of the proposed detection method is validated by simulation results.