基于Ward/REI等值理论的配网合环稳态电流计算

Study on Steady-State Current Due to Closing Loop in Distribution Network Based on Ward/REI's Equivalent

针对配网合环系统进行计算时,无法获取上级电网实时信息,需要对外部网络进行适当等值的问题,提出一种基于Ward/REI等值理论建立合环网络的等值模型,利用Ward型等值法具有良好数值解的特点,对外网进行Ward等值。在实时情况下,当系统的运行参数发生变化后,在边界节点处将会出现失配功率,以边界节点失配功率,增广一个校正REI网络来修正等值参数,使等值网满足在线分析对等值网准确度的需要。实际算例结果表明了该方法的有效性与实用性,对实际配网的调度运行提供了理论依据和技术支撑。

Point to the problem while the closed loop system of distribution network is calculating,we can not get the real-time information from superior power system,and it needed to make the appropriate equivalence of the outer network,hence,the equivalent model which based on the Ward/REI＇s Equivalent has been put forward to establish the closed loop network,Use of Ward Equivalent method to the external network which has good characteristics of numerical solutions,in real-time case,when the system＇s operating parameters change, the mismatch power will appear in the border node,the equivalent parameters need to correct through a correction REI network which to meet the online analysis of the needs of the accuracy of the equivalent network.The actual examples indicate the method＇s effective and practical,provide theoretical foundation and technical support for the dispatching of the actual distribution network.