【作者】 张娜；

【导师】 傅周兴；

【作者基本信息】 西安科技大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 随着电能质量敏感设备应用的快速增加,暂态电能质量问题已受到电力部门与用户的极大关注。暂态电能质量问题已成为电能质量检测和分析的研究重点,探讨和研究如何准确地检测出扰动和正确地进行分类识别的方法是其核心内容,也是构建完整的电能质量监测系统的必要步骤和进一步进行电能质量控制的前提条件。本文针对暂态电能质量问题,分析了基于不同方法的暂态电能质量扰动的研究现状,对各类暂态电能质量扰动特性及起因进行了综合分析,提出了基于S变换的暂态电能质量扰动的检测方法、分类识别方法和电压暂降源的辨识方法。论文以LabVIEW7.0为仿真平台,通过对各类扰动信号经S变换的统计信息图的仿真分析,提取特征参数,构造简单的规则树,依据“数据预处理—提取特征—规则树—输出结果”的流程实现了对常见的十种暂态电能质量扰动的自动检测与分类;通过对不同扰动源引起的电压暂降波形的分析,基于S变换提取扰动特征,实现了对七类电压暂降源的自动识别。仿真结果表明基于S变换的暂态电能质量扰动的检测方法对常见的各类暂态电能质量扰动可以实现快速、准确的检测;基于S变换的暂态电能质量扰动的分类方法识别正确率高,识别的扰动类型多,抗噪声能力较强,且规则树简单,易于实现;电压暂降源的辨识方法具有良好的识别能力。更多还原

【Abstract】 With the rapid increasing of devices sensitive to power quality, More and more attentions are paid to transient power quality problems by power unit and consumers. The study of transient power quality problems takes important part in the detection and analyzing of power quality. So discussing that how to detect and classify the power quality disturbances automatically and accurately is the core point of the problems, it’s also the necessary process to construct integrated power quality monitoring system and the premise to control power quality problems.This paper reviews the methods used in transient power quality disturbance analysis firstly, and secondly, that the characteristics and the causes of different transient power quality disturbance are analyzed in detail. Thirdly, based on the S-transform, that the detection, classification methods and the classification method of the voltage sag sources in transient power quality disturbance are proposed.Based on LabVIEW7.0, the paper achieves the automatic detection and classification of ten kinds of transient power quality disturbances by using of constructing simple rule-based tree after the analysis of various disturbances S-transform statistical information, and its process is“data processing– extracting characteristics– rule-based tree– outputting the result”. Then the work of the automatic classification of seven kinds of voltage sag sources is realized, by means of the wave graph analysis of various disturbance sources and the excellent extracting characteristics based on the S-transform.The results of simulation show that the detection method proposed could detect various transient power quality disturbances quickly and correctly; the classification method possesses high recognition rate, recognizing more kinds of disturbances, strong resistance to noises, simple rule-based classification tree and also is easy to be achieved; the classification method of the sources of voltage sag is effective.更多还原