基于正弦幅值积分器的全电流谐波检测方法

基于瞬时无功功率理论的i_p-i_q谐波检测法,环节繁多且结构复杂,同时低通滤波器(low pass filter,LPF)的存在又影响了谐波检测的快速性。为了准确且快速检测出电网谐波电流,实现对电网的补偿,该文提出一种基于正弦幅值积分器(sinusoidal amplitude integrator,SAI)的全电流谐波检测法,该方法在i_p-i_q谐波检测法的基础上省去负载电流有功分量和无功分量的计算环节,利用SAI的正序基波提取结构替换原来检测法中的LPF,提取出正序基波电流经过运算得到谐波指令电流,从而对电网进行补偿。在平衡电网下对所提方法进行仿真与实验,验证了该方法的可行性和有效性。

FULL CURRENT HARMONIC DETECTION METHOD BASED ON SINUSOIDAL AMPLIFIER

There are many links and complex structures in the i_p-i_q method which based on instantaneous reactive power theory. At the same time,the rapidity of harmonic detection is affected by the existence of low pass filter(LPF). On this basis,in order to accurately and quickly detect the harmonic current of the grid,this paper presents a full-current harmonic detection method based on Sinusoidal Amplitude Integrator(SAI). In this method,the calculation of active current and reactive current is eliminated on the basis of i_p-i_q harmonic detection method and the positive sequence fundamental wave extraction structure of SAI replaces the LPF. The harmonic command current is calculated by the extracted positive sequence fundamental current,in order to compensate the grid. The simulation and experiment of the proposed method are carried out under the balanced grid. Finally,the feasibility and validity of the method are verified.