含过渡电阻的配电网短路电流计算程序开发

Development of short-circuit current calculation program for distribution network based on C++

针对部分配电网短路电流计算算法只考虑金属性接地短路的问题,依据叠加原理将故障网络分解成正常网络和故障分量网络,利用牛顿拉夫逊法潮流计算及前推回代法进行短路电流计算,建立含过渡电阻的不同类型故障情况下的配电网分支电流和节点电压的计算模型,并利用C++开发了配电网络的短路电流计算程序.最后通过对IEEE12节点算例验证.结果表明,该模型可以准确地模拟经过渡电阻的短路故障,所开发的短路电流计算程序具有较高的计算精度,能够很好满足配电网多样化的短路电流计算需求.

For the computer algorithm of distribution network short circuit current calculation,only the metal grounding short circuit is considered.The fault network is decomposed into normal components and fault components according to the superposition principle.Then,the short-circuit current is calculated using the Newton Raphson′s power flow calculation method to build the model of branch current and node voltage of distribution network under different types of transition resistance.And the short circuit current calculation program of distribution network is developed by using C++.It can accurately simulate a short fault by transition resistance.Finally,the IEEE12 node example is used to verify the proposed short circuit current calculation program.The results show that the proposed method can obtain higher computational precision,and meet the demand of short circuit current calculation of distribution network.