基于瞬时无功功率理论谐波电流并行检测算法研究

Harmonic Current Parallel-Measurement Algorithm Based on Instantaneous Reactive Power Theory

提出了基于瞬时无功功率理论的谐波电流并行检测算法:首先通过锁相环电路获得电网电压相位并得到并行检测的各次谐波的变换矩阵;其次根据预测延迟时间计算各次谐波通道的预测补偿角;最后根据瞬时无功功率理论并行检测谐波电流,便可以实现各次谐波的并行精确检测。该算法和传统的瞬时无功功率检测方法相比,具有较低的谐波检测稳态误差,较快的响应速度,检测性能优越。计算机仿真和实验结果均表明该算法切实可行。

This paper presents harmonic current parallel-measurement algorithm based on instantaneous reactive power theory.This algorithm firstly obtains phase of grid voltage by PLL circuit and transformation matrix of each harmonic wave;then according to prediction delay time the algorithm calculates the prediction compensation angle of each harmonic wave;finally,based on instantaneous reactive power theory the algorithm concurrently detects each harmonic wave accurately.Compared with the traditional detection method based on instantaneous reactive power theory,this algorithm excels in low detection error in the steady state,fast response speed and predominant detection performance.Computer simulation and experiment results verify the validity of the algorithm.