基于瞬时无功功率理论的新型谐波检测算法

为降低谐波提取环节的运算量,快速、准确地检测出三相系统的谐波电流,本文在传统的基于瞬时无功功率理论的id-iq法基础之上,提出了将谐波检测环节中锁相环的鉴相部分与Park变换相结合的新型谐波检测算法。所提方法不使用电压信息直接提取谐波,消除了传统方法中由于电压畸变、不对称和电压采集所带来的检测误差,且鉴相环节和Park变换相结合,节省了运算时间。与基于广义积分器和传统id、iq法的谐波检测算法相比,该方法可以更为快速准确地提取谐波。通过仿真和实验,验证了该谐波检测方法的正确性和优越性。

A New Harmonic Detection Algorithms Based on the Instantaneous Reactive Power Theory

In order to reduce the computation in the harmonic extraction link,rapid and accurate detection ofharmonic currents of the three-phase system,the paper proposed a new type of harmonic detection algorithms which combined the phase part in the PLL with the Park transformation based on the i-i method of instantaneous reactive power theory.This method extracts harmonic without using the voltage information which can eliminate the detection errors brought by voltage distortion,asymmetric and voltage acquisition in the traditional way,and with the combination of the two parts saves the computing time.Compared with the harmonic detection algorithm based on the generalized integrator and i-i method,this new process can extract harmonic rapidly and exactly.The simulation and experiment verify the correctness and superiority of this new harmonic detection method.