基于正序分量的含PV节点的三相配网潮流算法

随着分布式发电(distributed generators,DG)接入配电网,传统的配电网潮流算法难以满足分布式发电系统潮流计算的要求。针对这一情况,提出一种有效的三相不平衡配电网潮流直接算法,该算法充分利用配电网络的结构特点,基于回路分析法生成的道路矩阵,建立节点电压与注入电流之间的关系矩阵,从而实现配网潮流的直接计算。同时,基于PV节点正序电压幅值保持恒定的特性,提出一种新的处理PV类型DG的方法,该方法基于正序分量方法和道路矩阵,推导得到无功电流和补偿电压之间的关联公式,可非常简单地引入到三相不平衡配网潮流计算算法中,并保证PV节点有功功率和电压幅值为预设定值(假定无功功率没有越界)。通过6母线和69母线算例验证该方法的有效性和通用性。

Positive-sequence Component Based Three-phase Unbalanced Power Flow Solution for Distribution System With PV Nodes

The traditional power flow methods aren’t appropriate to the electrical distribution systems with distributed generators(DG).Therefore,a direct unbalanced three-phase power flow algorithm was presented in this paper.The proposed approach which was developed based on the path matrix,utilized the special topological structure of distribution systems and established the incident matrix of node voltages and injection currents.Based on the assumption that the positive-sequence voltage magnitudes of PV nodes are invariable,the relation of reactive power and compensation voltage for the PV nodes had been derived by the positive-sequence component and path matrix.As a result,a new approach handling PV nodes of DG had been proposed and could be integrated into the proposed power flow method.It needn’t introduce any additional active power at PV nodes and kept the positive-sequence voltage magnitudes on their scheduled values,considering that reactive power limits were not violated.The results of the 6-bus and the 69-bus test systems verified the validity and universality of the proposed methods.