| 基于递归小波的相量测量算法 |
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| 引用本文： | 张姝,何正友,何文.基于递归小波的相量测量算法[J].电网技术,2011(4). |
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| 作者姓名： | 张姝 何正友 何文 |
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| 作者单位： | 西南交通大学电气工程学院; |
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| 摘 要： | 传统傅里叶变换算法在电网处于非稳定情况时,会由于异步采样产生栅栏效应和频谱泄漏的问题,为相量测量带来很大的误差。而小波变换是以频带的方式处理信息,对非平稳信号具有良好的识别能力。递归小波由于构造特点,通过z变换后,可以进行递归运算,便于相量估计的实现。为此提出一种自适应调节小波尺度因子的方法,利用递归小波解决电力信号的相量测量问题。主要针对电网中常见的谐波干扰、频率偏移以及故障时电力信号含有直流衰减分量等情况,应用理想信号以及PSCAD/EMTDC仿真信号检验算法的性能。大量仿真分析表明:该算法在电网频率偏移时能够精确地对信号进行相量测量,具有良好的自适应性,对含有各种干扰的电力信号也具有良好的测量能力。
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| 关 键 词： | 傅里叶变换 相量测量 小波变换 递归运算 尺度因子 |
A Recursive Wavelet-Based Algorithm for Phasor Measurement |
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| ZHANG Shu,HE Zhengyou,HE Wen.A Recursive Wavelet-Based Algorithm for Phasor Measurement[J].Power System Technology,2011(4). |
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| Authors: | ZHANG Shu HE Zhengyou HE Wen |
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| Affiliation: | ZHANG Shu,HE Zhengyou,HE Wen(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan Province,China) |
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| Abstract: | Due to asynchronous sampling,traditional Fourier transform algorithm may cause fence effect and spectrum leakage,which bring large error in the phasor measurement,while power system is in instable condition.However,wavelet transform processes information in the form of frequency band,so it possesses good identification ability.Owing to structural feature of recursive wavelet,after the z-transform the recursive operation can be performed and it is convenient for the implementation of phasor estimation.For th... |
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| Keywords: | Fourier transform phasor measurement wavelet transform recursive algorithm scale factor |
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