引用本文: | 覃星福,龚仁喜.基于广义S变换与PSO-PNN的电能质量扰动识别[J].电力系统保护与控制,2016,44(15):10-17.[点击复制] |
QIN Xingfu,GONG Renxi.Power quality disturbances classification based on generalized S-transform and PSO-PNN[J].Power System Protection and Control,2016,44(15):10-17[点击复制] |
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摘要: |
为了克服从电网电能质量监测系统的大数据中自动识别出电能质量扰动的困难,提出了一种基于广义S变换与PSO-PNN的电能质量扰动识别新方法。该方法利用了广义S变换能兼顾时频分辨率的特点,首先使用广义S变换分析扰动信号的时频特性,接着从广义S变换模矩阵中提取出扰动信号的时频特征量,然后用PSO-PNN分类器对扰动信号进行分类识别。PSO算法的使用克服了PNN的平滑因子没有确定选取方法的缺陷,使分类器性能大大提升。仿真实验结果表明,该方法能够对常见的6种电能质量扰动进行高效的分类识别,分类正确率高,对噪声不敏感,具有良好的应用价值。 |
关键词: 电力系统 电能质量 广义S变换 PSO-PNN 分类识别 |
DOI:10.7667/PSPC151524 |
投稿时间:2015-08-28修订日期:2015-10-19 |
基金项目:国家自然科学基金项目(61561007) |
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Power quality disturbances classification based on generalized S-transform and PSO-PNN |
QIN Xingfu,GONG Renxi |
(School of Electrical Engineering, Guangxi University, Nanning 530004, China) |
Abstract: |
To overcome the difficulty of automatic identification of power quality disturbances from the large data of power quality monitoring system, a new method for power quality disturbances identification is proposed based on generalized S-transform and PSO-PNN. It makes full use of generalized S-transform’s ability of giving attention to both time and frequency resolution. Initially, the time-frequency analysis of power quality disturbances is carried out by using generalized S-transform, from whose results the time-frequency features of disturbances are extracted. Finally, PSO-PNN, as a classifier, is used to identify power quality disturbances. The PSO algorithm solves the problem of choosing the smoothing factor for PNN which is usually hard to determine, and thus the performance of the classifier is greatly improved. The simulation results show that the proposed method can identify six kinds of power quality disturbances correctly and effectively, and it is characterized by high recognition correctness rate and low sensitivity to noises, and it will find extensive application. This work is supported by National Natural Science Foundation of China (No. 61561007). |
Key words: power system power quality generalized S-transform PSO-PNN classification and identification |