针对不平衡电网的谐波检测新方法  

A New Harmonic Detection Method for the Unbalanced Grid

作　　者：丁稳房[1] 毛雨阳 徐岸非 DING Wenfang;MAO Yuyang;XU Anfei(Hubei Provincial Key Laboratory of Solar Energy Efficient Utilization and Energy Storage Operation Control,Hubei University of Technology,Wuhan 430068,Hubei,China)

机构地区：[1]湖北工业大学湖北省太阳能高效利用及储能运行控制重点实验室,湖北武汉430068

出　　处：《电网与清洁能源》2022年第5期71-78,共8页Power System and Clean Energy

基　　金：湖北省技术创新专项重大项目资助项目(2019AAA018)。

摘　　要：为解决不平衡电网中电压相位偏移及电流中存在不平衡分量对谐波检测造成的影响,利用二阶广义积分原理设计了一种适用于电网电压不平衡且可抗直流分量干扰的锁相环;其次,在传统d-q变换谐波检测法的基础上做出改进,利用对称分量法提取负序基波电流,经Park变换得到负序基波电流在正序坐标系下的交流分量,从而消除传统谐波检测方法在三相不平衡工况下对正序基波电流检测时的误差。经仿真验证分析,该方法能有效检测出不平衡电网中的谐波电流。To address the influence of voltage phase offset and unbalanced component in current on the harmonic detection in the unbalanced grid,based on the second-order generalized integral principle,this paper designs a phase-locked loop(PLL)suitable for power grid voltage imbalance and resistant to DC component interference.Next,based on the traditional d-q transform harmonic detection method,the symmetrical component method is used to extract the negative sequence fundamental current,and the AC component of the negative sequence fundamental current in the positive sequence coordinate system is calculated by Park transform,so as to eliminate the error of the traditional method in detecting the positive sequence fundamental current in case of three-phase imbalance.The simulation results show that this method can effectively detect the harmonic current in the unbalanced power grid.

关 键 词：不平衡电网 谐波检测 D-Q变换 正序分量 负序分量 

分 类 号：TM743[电气工程—电力系统及自动化]