配电网合环操作快速校验方法研究

Research on Fast Verification Method on Closing Loop Currents of Distribution Networks

配电网合环操作产生的合环电流,会对电网的安全运行造成不利影响,需要对合环电流进行计算校验以保证合环操作的安全性。提出一种简易实用的配电网合环操作快速校验方法。首先,在合环前潮流分布的基础上,基于叠加原理和戴维南定理计算合环稳态电流;并在满足工程精度要求的前提下对计算公式进行简化,使其具备更好的实用性;然后,通过暂态过程分析进行合环冲击电流的计算校验。实际案例分析结果验证了方法的有效性和实用性。

The closing-loop current caused by the closing-loop operation of distribution network may cause impact to the safety of the power system operation.It is necessary to calculate the closing-loop current in order to verify the safety of the closingloop action.A simple and practical method for verifying the closing-loop current is proposed in this paper.The first step in this method is to calculate the steady state current based on the power flow distribution before the closing loop operation,under the guidance of superposition principle and the Thevenin＇s theorem.This part of calculation is simplified on the premise of meeting specifi requirement of engineering precision.Then,based on the transient analyses,the impact current is calculated and verified.The effectiveness of this method is verified in real practice and been proved practical.