摘要
根据电压陷波非对称性特征,提出了一种简易的电压陷波快速检测方法,当采样值周期和大于扰动阈值时判据采样数据序列存在扰动区间,在扰动区间采用上半周和下半周对应采样值之和大于电压陷波阈值定值确定电压陷波可能发生的具体位置区间,根据电压陷波可能发生的位置区间采样值的单调性、凹凸特性及极值情况进一步确定是否发生电压陷波,并对此后连续三周同区段数据进行分析,确定周期性电压陷波的真实发生,进而对发生的电压陷波深度、宽度和面积进行估值计算,并判定是否超越阈值,若超越阈值则提示预警,表明换相过程存在隐患,需提早进行维护。该方法简单快捷,可实时在线完成。仿真实验表明了该方法的有效性。
According to the asymmetry characteristics of voltage notch,a simple fast detection method and early warning of voltage notch are proposed.When the period of sampling value is greater than the disturbance threshold,there is a disturbance interval in the sampling data sequence.In the disturbance interval,the sum of the corresponding sampling values of the upper half cycle and the lower half cycle is greater than the fixed value of the voltage notch threshold to determine the specific location interval where the voltage notch may occur.According to the monotonicity,concave and convex characteristics and extreme values of the sampling values in the location interval where the voltage notch may occur,the voltage notch phenomenon is further determined.The data of the same section for three consecutive weeks are analyzed to determine the actual occurrence of periodic voltage notch.Then,the depth,width and area of the voltage notch are estimated and calculated,and whether the threshold is exceeded is determined.If the threshold is exceeded,the warning is prompted,indicating that there are hidden dangers in the commutation process and early maintenance is needed.This method is simple and fast,and can be completed in real time online.Simulation results show the effectiveness of the method.
作者
尹森林
YIN Senlin(Shanghai HongTan Intelligent Science and Technology Co.,Ltd.,Shanghai 201306,China)
出处
《电工技术》
2025年第22期257-260,共4页
Electric Engineering
关键词
电能质量
电压陷波
非对称性特征
采样值拐点
极值点
陷波参量计算
power quality
voltage notch
asymmetric characteristics
inflection point of sampling value
extreme point
notch parameter calculation
