应用多倍频旋转坐标正交变换的三相四线制电路谐波检测方法  

A New Harmonic Detection Method for Three-Phase Four-Wire System Based on Orthogonal Transformation of Multi-Frequency Rotating Coordinate

作　　者：刘桂英[1] 粟时平[1] 秦志清[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南省长沙市410076

出　　处：《电网技术》2010年第7期87-93,共7页Power System Technology

基　　金：国家自然科学基金资助项目(50677058);湖南省教育厅项目(08HNJYT043)~~

摘　　要：谐波检测是电力系统谐波分析和控制的重要基础。提出了一种基于多倍频旋转坐标正交变换的三相四线制电路谐波检测方法,详细阐述了多倍频旋转坐标正交变换的基本理论及其谐波检测的实现过程,并给出了仿真结果。该方法通过多倍频旋转坐标正交变换,将三相瞬时电压、瞬时电流变换为三维多倍频旋转空间瞬时电压、瞬时电流;然后利用交直流分解法对三维多倍频旋转空间瞬时电压、瞬时电流做进一步分析处理,得到特定频率的空间瞬时电压和瞬时电流;最后将分析处理结果变换为三相瞬时电压、瞬时电流。理论分析和仿真证明:该方法能够无原理误差实时检测任意次谐波分量和任意基波分量的瞬时值,且具有检测精度高、实时性好、实现简单的特点。Harmonic detection is an important foundation for the analysis and control of power system harmonics. Based on orthogonal transformation of multi-frequency rotating coordinate, a harmonic detection approach for three-phase four-wire system is proposed; the basic principle of orthogonal transformation of multi-frequency rotating coordinate and corresponding implementation of harmonic detection are expounded in detail, and simulation results are given. By means of orthogonal transformation of multi-frequency rotating coordinate, the instantaneous voltages and currents in three-phase system are changed into instantaneous voltages and currents in three-dimensional multi-frequency rotating space; then utilizing decomposition of AC and DC components in orthogonal coordinates, instantaneous voltages and currents in three-dimensional multi-frequency rotating space are further processed to obtain spatial instantaneous voltages and currents with specific frequencies; finally, the results from the analysis and processing are changed back into instantaneous voltages and currents in three-phase system. Both theoretical analysis and simulation results show that the proposed approach can detect real-time instantaneous value of any order of harmonic component and fundamental component without principle error, and it possesses following such advantages as high detection accuracy, good real-time performance and convenient for implementation.

关 键 词：谐波检测 正交变换 旋转坐标 多倍频 三相四线制 

分 类 号：TM76[电气工程—电力系统及自动化]