基于牵引负荷的三相不平衡度计算方法比较

Comparison of Different Calculation Methods for Three-phase Voltage Unbalance Based on Measured Traction Load

三相电压不平衡度是电力系统评估的一个重要指标,不同的国家和地区有不同的计算标准。铁路牵引负荷是一个特殊的用电负荷-单相电力负荷,具有单相独立性和不对称性。文中针对实测的牵引负荷数据,用国内外不同的电压不平衡度计算标准对同一实测数据进行计算,得出5种不同计算标准下电铁电压不平衡度的区别和相关性,便于工程技术人员针对此特殊的供电负荷,选择合适的电压不平衡度计算方法。

The three-phase voltage unbalance degree is an important index for power system evaluation. Different countries and regions have different calculation standards. Traction load is a special electrical load, a single-phase electric power load with single phase independence and asymmetry. According to the measured data of the traction＇s load, this paper takes different calculation methods for calculating three-phase voltage unbalance degree. The differ- ences and the correlations of the five different calculation methods can be obtained, which can be used for engineers and technicians to choose the proper calculation method for the special electrical load to calculate its three-phase volt- age unbalance degree.