电压暂降特征值统计分析及暂降传播特性

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摘要进行电压暂降评估及其对敏感设备影响的分析,制定电压暂降有效缓解措施,均应建立在对电压暂降特征值充分了解的基础上,但目前有关描述电压暂降特征量典型取值范围及其分布特征方面的研究还较少。该文就暂降特征值统计分析、分类研究、传播计算及负荷侧暂降计算四个问题进行了研究,旨在为电网及敏感设备暂降评估与治理等研究奠定基础。首先基于我国多个地区电能质量监测系统记录的大量电压暂降事件及其实测波形的统计与分析,给出了电压暂降幅值、持续时间、暂降起始点、相位跳变四个特征量的分布特征、范围;然后在原有电压暂降分类基础上,将相位跳变考虑其中,提出了更一般化的电压暂降分类方法,并研究了变压器对不同类型暂降相位跳变的影响;最后为方便计算负荷及相关节点暂降,提出了变压器、线路叠加计算及多变压器、负荷联结方式等效计算方法,完善了电压暂降的传播特性研究。

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关键词 ：电压暂降特征量, 范围和分布, 相位跳变, 暂降分类, 传播特性

Abstract：In order to assess the voltage sag, analyze its impact on sensitive equipment, and develop effective mitigation measures, the full understanding of the voltage sag characteristics is necessary. However, less research work has been focused on the voltage sag characteristics, and its range and distribution are not well understood currently. In this paper, four problems, i.e. statistical analysis of characteristics, classification study, propagation calculations, and sags calculations on the load side, are researched, which aim to lay the foundation for sags assessment and treatment of the gird and sensitive equipment. Firstly, the ranges and distributions of four characteristics, including magnitude, duration, point on wave of initiation, and phase shift, are presented based on the analysis of massive voltage sag events and waveforms recorded by multiple power quality monitoring systems in China. Secondly, a more generalized voltage sags classification method considering the phase shift is proposed on the basis of original methods. Then the transformers’ effects on the phase shift of various voltage sag types are studied. Finally, to simplify the sags calculation of the load and associated nodes, the superposition calculation methods concerning transforms and lines are proposed, which can treat multiple transforms and load connections and thus improve the research on the propagation characteristics of voltage sags.

Key words： Voltage sag characteristics range and distribution phase shift sag classification propagation property

收稿日期: 2015-07-23 出版日期: 2016-07-12

PACS:

TM76

基金资助:国家自然科学基金资助项目(51277069)。

通讯作者: 兰巧倩女,1990年生,硕士研究生,研究方向为电压暂降分析与治理。E-mail:735286417@qq.com

作者简介: 徐永海男,1966年生,教授,博士生导师,研究方向为电能质量分析与控制、新能源电力系统等。E-mail:yonghaixu@263.net

引用本文:

徐永海,兰巧倩,孔祥雨,洪旺松. 电压暂降特征值统计分析及暂降传播特性[J]. 电工技术学报, 2016, 31(11): 165-175. Xu Yonghai Lan Qiaoqian Kong Xiangyu Hong Wangsong. Statistical Analysis of Voltage Sag Characteristics and Research on Sag Propagation Property. Transactions of China Electrotechnical Society, 2016, 31(11): 165-175.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I11/165

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