中压配网电压偏差与波动综合评估方法及其应用

摘要

This paper proposed a comprehensive assessment method of a kind of voltage deviation and lfuctuation for medium voltage distri-bution network, based on the voltage distribution characteristic and the standard deviation to relfect voltage deviation and lfuctuation. It meant that the measured value of voltages at each monitoring point could be collected in the evaluation period in real time and the standard deviation was calculated to evaluate the voltage lfuctuation. The voltage deviation interval function was designed, in which voltage deviation interval will be divided reasonably and the weight score will be set according to the actual application requirement and engineering experience. This paper carried out statistics for the probability of voltage monitoring value at each voltage deviation interval. Distribution of voltage deviation was char-acterized as weighted sum of probability of voltage monitoring value at each voltage deviation interval. The synthesized weights of voltage devi-ation and lfuctuation were determined via the sequence-relation analysis and entropy method, which were applied to comprehensive assessments of voltage deviation and lfuctuation for medium voltage distribution network. The practical example illustration veriifes the good engineering application value of this method.%提出一种中压配网电压偏差与波动的综合评估方法，以电压分布特性和标准差反映电压的偏差和波动情况。即获取评估时间段内各监测点的实时电压监测值，求取其标准差以评估电压波动大小；设计电压偏差区间函数，根据实际应用需求和工程经验合理划分电压偏差区间并设置各区间权重得分；统计电压监测值位于各电压偏差区间的概率，用各电压偏差区间的概率与其权重得分的加权求和表征电压偏差的分布情况；并采用序关系分析法和熵值法相结合的主客观赋权法计算电压偏差和电压波动的综合权重，对中压配网各监测点的电压偏差和波动进行综合评估；实际例证验证了该方法良好的工程应用价值。