基于电压持续曲线的多次电压暂降严重程度评估方法

摘要

为了衡量电压暂降对用电设备的影响和指导电压暂降补偿方案的设计,须评估电压暂降对负荷影响的严重程度.分析了多次电压暂降在时间尺度上的集聚效应,针对用电设备修复时间内的多次非规则电压暂降,将其电压时序曲线转换为电压持续曲线,定义了多次电压暂降的平均越限持续时间差和越限率;对比了多种常规严重度指标的优劣,将电压暂降经历的多个持续时间区间敏感度相叠加,构建更加精细的改进电压暂降严重度指标,与多次电压暂降的电压持续曲线结合,形成多次电压暂降严重度评估方法.某110 kV变电站和IEEE1159.2测试数据的仿真结果验证了所提方法的正确性.%To measure the influence of voltage sag on electric equipments and guide the design of compensation scheme for voltage sag,the severity of voltage sag's effect on loads must be evaluated.The agglomeration effects of muhiple voltage sags on time scales are analyzed.The voltage time-series curves of irregular multiple voltage sags are converted to voltage duration curves.The average over-limit duration time difference and over-limit probability of multiple voltage sags are defined.Comparing the advantages and disadvantages of many kinds of conventional severity indexes,a more elaborate improved voltage sag severity index is proposed by adding the sensitivity of multiple duration intervals.Combining the improved voltage sag severity index with voltage duration curves,an evaluation method for multiple voltage sag severity is established.Simulative results of a 110 kV substation and IEEEl159.2 test data verify the correctness of the proposed method.