考虑系统与敏感设备的变电站电压暂降综合评估  

Assessment of Voltage Sags in Substations Based on Power System and Equipment Sensitivity Analysis

作　　者：周翔[1] 王丰华[1] 黄荣辉 张君[1] 冯琳[1] 

机构地区：[1]上海交通大学电气工程系,上海市闵行区200240 [2]深圳供电局有限公司,广东省深圳市518000

出　　处：《中国电机工程学报》2015年第8期1940-1946,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51307106)~~

摘　　要：现有的变电站电压暂降评估指标通常为系统侧电压暂降的统计指标或用户侧敏感设备的停运指标,对于电压暂降事件的描述具有片面性,难以推广。为准确地评估电压暂降事件的影响,结合现有的改进IEC 61000-2-8暂降统计表格和设备停运概率评估法,提出综合考虑系统侧及用户侧敏感设备受影响程度的电压暂降综合评估指标。首先,利用层次分析法确定改进IEC 61000-2-8暂降统计表格中暂降持续时间的权重,提取系统侧指标;然后,结合敏感度概率模型,计算用户设备受影响程度;最后,采用熵权法兼顾系统侧和用户侧暂降情况,提取电压暂降综合指标。使用该评估方法分析某城市电网电压暂降监测数据的结果表明,所提电压暂降综合指标可以更有效地描述电网中典型变电站的电压暂降情况,从而为进一步改善电能质量及提高供电可靠性提供参考依据。The existing indices of voltage sags in substations are respectively describing voltage sags in the grid or the impact on electric utilities, which are incomplete and not propagable. In order to exactly evaluate the effects of voltage sags, the comprehensive evaluation index of voltage sags was proposed in the paper, where the improved statistical table of IEC 61000-2-8 and probability estimation of utility outage were considered simultaneously. First, analytic hierarchy process was applied to calculate the weight of voltage sag duration which the statistical index was extracted based on. Then the probability of utility outage was obtained based on probabilistic models. Hence the voltage sag evaluation index considering voltage sags in the grid and the impact on electric utilities could be extracted via the entropy coefficient method. This assessment method was applied to analyze voltage sags from the monitoring system of power quality of a city power grid. The results show that the proposed voltage sag evaluation index can describe the situation of voltage sags in monitoring sites more effectively, which is beneficial for the improvement of power quality and supply reliability.

关 键 词：变电站 电压暂降 设备停运 层次分析法 熵权法 

分 类 号：TM71[电气工程—电力系统及自动化]