基于电网不平衡的谐波检测改进算法研究  

Research on Improved Algorithm of Harmonic Detection Based on Unbalanced Grid

作　　者：李萌[1] L(Department of Mechanical and Electrical Engineering, Jiangsu Food ＆ Pharmaceutical Science College, Huaian 223000, Chin)

机构地区：[1]江苏食品药品职业技术学院机电工程学院

出　　处：《控制工程》2018年第4期607-613,共7页Control Engineering of China

基　　金：淮安市重点研发计划(HAG2015018);淮安市创新能力建设计划(HAP201703)

摘　　要：有源电力滤波器在运行时，不可避免要考虑电网磁场不平衡的运行条件。主要研究了电网磁场不平衡时，有源电力滤波器的谐波检测方法。首先分析了三相电网磁场不平衡时，相位偏差对传统ip-ip谐波检测方法的影响，然后在此基础上对该谐波检测方法行了改进，改进后的谐波检测算法能在三相负载电流不平衡时，准确检测基波电流、基波正负序电流、基波正序有功电流和特定次谐波电流。结果证明了理论分析的正确性。It is inevitable to consider unbalanced grid electromagnetic condition when the active power filter works. This paper has studied the harmonic detection method of active power filter under the unbalance grid electromagnetic field. Firstly, the influence of phase deviation of the unbalance grid to il,-iq harmonic detection method has been analyzed, then the improved harmonic detection method has been proposed, this improved harmonic detection algorithm could be used in the three-phase unbalanced load current, can accurately detect the fundamental current, positive and negative sequence fundamental current, fundamental positive sequence active current and specific harmonic currents. Results has shown the theoretical analysis of this article.

关 键 词：电网磁场不平衡 IP-IQ法 投影变换 基波负序电流 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]