基于小波变换的d-q电力谐波检测法研究  

Research on d-q detection method based on wavelet-transform for harmonic of power system

作　　者：李秋燕[1] 黄永红[1] 陈万锋[1] 陈治屹 徐俊俊[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江210013

出　　处：《电测与仪表》2015年第19期24-29,42,共7页Electrical Measurement & Instrumentation

基　　金：江苏省高等学校大学生创新创业训练计划项目(10299012)

摘　　要：为了更有效地治理电力系统谐波污染,文中采用一种基于小波变换的d-q电力谐波检测法。该方法使用小波变换将基于瞬时无功功率理论d-q法的LPF滤波环节替换,并在Park变换后滤除负序分量。小波变换采用小波多分辨率分析实现,将小波变换后的直流分量和各次交流分量进行重构,分别得到三相电流的基波和各次谐波。在PSCAD/EMTDC中进行基于小波变换的d-q法建模和仿真实验,并通过与d-q法的仿真结果进行比较来验证该方法的可行性和精确度。结果表明该方法能够更精确的检测基波和各频段谐波分量。In order to effectively eliminate the harmonic pollution of power system,this paper develops a d-q detection method based on wavelet-transform for harmonic of power system. LPF for separating fundamental-wave of instantaneous reactive power theory d-q method will be replaced by the wavelet transform in this method,and the negative sequence component will be eliminated after park-transformation. Wavelet transform is achieved by the wavelet multiresolution analysis,fundamental wave and harmonic components of the three-phase current can be obtained by reconstructing the DC component and frequency AC component after wavelet-transform. Modeling and simulation experiment of this approach will be carried out in PSCAD / EMTDC,and the method will be compared with d-q simulation result to verify its actual feasibility and accuracy. Experimental results show that d-q method based on wavelet-transform can more accurately detect the fundamental and each band harmonic components.

关 键 词：小波变换 多分辨率分析 电力谐波检测 PARK变换 d-q法 PSCAD/EMTDC 

分 类 号：TM76[电气工程—电力系统及自动化]