基于改进潮流算法的非满量测配电网短路电流计算

Short Circuit Current Calculation of Distribution Network with Non Full Measurement Based on Modified Power Flow Algorithm

配电网节点数目多且量测配置不足,导致其短路电流计算存在困难,为此,提出基于改进潮流算法的非满量测配电网短路电流计算方法。算法利用量测电压初始化节点的电压,并引入负荷静态电压特性模型,对节点电压进行前推回代运算,得出配电系统正常运行时的节点电压。在此基础上,根据短路故障的类型,建立故障状态下系统的节点电压方程,解方程得出短路电流。通过15节点系统的算例,得出4类故障的短路电流计算值均与Matlab仿真结果相近,证明了该计算方法的可行性和有效性。

The large number of node and the small number of measurement in distribution network lead to difficulties in the short circuit current calculation. So a short circuit current calculation method of distribution network with non full measurement based on modified power flow algorithm is proposed. The method initializes node voltages by measured voltages,introduces the load model with static voltage characteristic,and obtains node voltages of distribution network in normal operation by the forward and backward calculation of node voltages. On the basis above and according to short circuit fault type,the node voltage equation in fault status is established and short circuit current can be obtained by solving the equation. Based on an example of a 15 nodes system,it is found that short circuit current values of four kinds of faults calculated are similar to results of Matlab simulation;which proves the feasibility and effectiveness of the proposed method.