基于实测数据的陕西电网电压暂降特征分布分析

Analysis of Voltage Sag Characteristic Distribution in Shaanxi Power Grid Based on Measured Data

以陕西电网大量电压暂降实测数据为基础,从暂降幅值、持续时间、电压等级、暂降相序、发生月份和电压暂降的连续性5个方面对暂降事件进行全面的分类统计,分析电压暂降特征。分析结果表明电压暂降在幅值和持续时间的分布集中度较高,有必要对区间进行进一步细分;不同电压等级电网中的电压暂降分布存在一定的差异;不同电压等级电网中电压暂降的相序分布不同;负荷需求的季节性变化会影响电压暂降的发生频率;连续性电压暂降在不同监测点和月份的分布不一致。

Based on a large number of measured data of voltage sag in Shaanxi power grid,comprehensive classification and statistics of sag events are made from the aspects of sag amplitude,duration,voltage level,sag phase sequence,occurrence month and voltage sag continuity,and the characteristics of voltage sag are analyzed.The results show that the distribution concentration of voltage sag in amplitude and duration is high,so it is necessary to further subdivide the interval.There are some differences in the distribution of voltage sag in power grid with different voltage levels.The phase sequence distribution of voltage sag in power grid with different voltage levels is different.The seasonal change of load demand will also affect the frequency of voltage sag.The distribution of voltage sag is different in different monitoring points and months.