基于d-q变换的网侧双闭环谐波电流检测研究  

Research on Double Closed Loop Harmonic Current Detection Based on d-q Transform

作　　者：陈泽华 马立新 李明江 CHEN Ze-hua;MA Li-xin;LI Ming-jiang(School of Mechanical Engineering,Shanghai University of Technology,Shanghai 200082,China)

机构地区：[1]上海理工大学机械工程学院

出　　处：《软件导刊》2020年第1期152-155,共4页Software Guide

基　　金：上海市张江国家自主创新重点项目(201310-PI-B2-008)

摘　　要：有源电力滤波器大多采用基于瞬时无功功率理论的谐波检测算法。在运用该理论下的d-q算法时,由于使用到低通滤波器,使得谐波的实时提取精度较低并产生相移现象,当补偿低频次不平衡电流时难以控制输出的补偿电流分量。为了避免以上情况,提出了一种基于d-q变换的网侧电流双闭环控制谐波电流检测算法。以系统负载电流为干扰变量,网侧电流为状态变量,运用等式互消法建立以d-q坐标系为基础的网侧谐波检测模型。设计相应的电流、电压闭环控制器,避免因使用低通滤波器造成的补偿误差。仿真结果显示,新方法下的总谐波失真率比d-q变换减少了8.45%,低次谐波含量得到有效抑制。Active power filters mostly use harmonic detection algorithm based on instantaneous reactive power theory.When using the d-q algorithm based on this theory,the low-pass filter makes the real-time extraction accuracy of harmonics lower and produces phase-shift phenomenon.When compensating low frequency of unbalanced current,it is difficult to control the component of compen⁃sating current.In order to avoid the situation,this paper proposes a harmonic current detection algorithm based on d-q transform with double closed-loop control of grid current.Based on the system load current as the disturbance variable and the network side current as the state variable,the network side harmonic detection model based on d-q coordinate system is established by using the equality mu⁃tual cancellation method.The closed-loop current and voltage controllers are designed to avoid the compensation errors caused by the use of low-pass filters.The simulation results show that the total harmonic distortion rate of the new method is reduced by 8.45%com⁃pared with the d-q transform,and the low-order harmonic content is effectively suppressed,which proves the feasibility and effective⁃ness of the method.

关 键 词：APF 谐波检测 D-Q变换 网侧电流 闭环控制 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论]