采用改进不完全S变换估计电能质量扰动参数

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摘要为克服S变换计算量大和不能准确估计某些电能质量扰动参数的缺陷, 结合改进S变换和不完全S变换提出了一种估计电能质量扰动参数的新方法。首先给出了改进不完全S变换的计算过程, 接着讨论了不同类型扰动信号求改进不完全S变换所需的最佳窗宽系数;然后介绍了参数估计的特征量提取, 它是针对不同扰动频率点自适应地采用最佳窗宽系数求改进不完全S变换得到的模向量;最后说明了由这些特征量进行电能质量扰动参数估计的方法。仿真结果验证了所提方法具有算法简单、运算量小、估计精度高等特点。

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	李立
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关键词 ：电能质量, 改进不完全S变换, 计算过程, 自适应, 扰动参数

Abstract：This paper proposes a new method of parameter estimation of power quality disturbances based on modified incomplete S-transform, which combines the modified S-transform with incomplete S-transform. The method complementary advantages in time frequency resolutions and computation speed. First, the computational procedure is provided. After that the optimal windowing coefficients in connection with different disturbances are discussed. Then the extraction of characteristic quantities is introduced, which are the module vectors obtained from the modified incomplete S-transform. The computation of each vector based on adaptive selection of optimal windowing coefficient. Finally, the parameters estimation method which utilizes these characteristic quantities are illustrated. Simulation results verified that the proposed method has characteristics of lower complexity, less computation and high precision.

Key words： Power quality modified incomplete S-transform computational procedure adaptive disturbance parameters

收稿日期: 2010-01-16 出版日期: 2014-03-07

PACS:

TM933.4

作者简介: 李立女, 1961年生, 副教授, 硕士, 研究方向为电力系统自动化和测控技术。易吉良男, 1972年生, 讲师, 博士, 研究方向为电能质量分析和信号处理。

引用本文:

李立, 易吉良, 朱建林. 采用改进不完全S变换估计电能质量扰动参数[J]. 电工技术学报, 2011, 26(6): 187-193. Li Li, Yi Jiliang, Zhu Jianlin. Parameter Estimation of Power Quality Disturbances Using Modified Incomplete S-Transform. Transactions of China Electrotechnical Society, 2011, 26(6): 187-193.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2011/V26/I6/187

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