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考虑到实际系统中充电站并网点的运行电压一般不是额定电压水平,且在相同功率下,电压值的变化会引起电流值变化。为使充电站并网谐波潮流计算更精确,本文提出一种适用于充电站的谐波潮流计算模型,该模型为考虑了充电站并网侧电压和自身阻抗影响的充电站等效电流源模型,并根据电动汽车充电站的工作原理,提出了一种含电动汽车充电站模型的谐波潮流计算方法。算例采用IEEE-33节点配电网系统,对两种类型谐波源在多种注入方式下进行谐波潮流计算,对比结果表明,计算中修正谐波电流后,含充电站负荷的节点及相邻节点的电压畸变率增大,充电站并网不仅影响本节点还影响相邻节点的电能质量。
Considering that the operating voltage of the charging station and the network connection point in the actual system is generally not the rated voltage level, and the change of the voltage value will cause the change of the current value under the same power. In order to make the calculation of the harmonics power flow in the charging station more accurate, a harmonic power flow calculation model suitable for the charging station is proposed in this paper. The model is an equivalent current source of the charging station that takes into account the influence of the grid-side voltage of the charging station and its own impedance Model, and according to the working principle of EV charging station, a calculation method of harmonic power flow with EV charging station model is proposed. The example uses the IEEE-33 node distribution network system to calculate the harmonic power flow of the two types of harmonic sources under various injection modes. The comparison results show that after the harmonic current is rectified, the nodes containing the charging station and The voltage distortion rate of adjacent nodes increases. The grid connection of charging stations not only affects the node but also affects the power quality of neighboring nodes.