10kV配电网合环电流计算方法研究  

Research on Calculation Method of Closed Loop Current in 10 kV Distribution Network

作　　者：石钟文 温辉 杨利森 杨春阳 李勇 SHI Zhongwen;WEN Hui;YANG Lisen;YANG Chunyang;LI Yong(State Grid Gansu Electric Power Company,Jiayuguan Power Supply Company,Jiayuguan 735100,China)

机构地区：[1]国网甘肃省电力公司嘉峪关供电公司,甘肃嘉峪关735100

出　　处：《电工技术》2023年第15期93-96,共4页Electric Engineering

基　　金：国家电网科技项目资助(编号522705220002)。

摘　　要：合环转供电已成为10 kV配电网转移负荷的重要方式,而合环电流的计算是合环转供电操作的必要前提。为保证合环操作的顺利进行,提出了一种10 kV配电网合环电流计算方法。首先依据戴维南定理建立了典型配电网合环系统的等效电路;然后利用叠加定理对合环稳态电流和冲击电流进行了理论分析,并考虑最大合环冲击电流出现时刻和所在相的影响,改进了现有合环冲击电流计算方法,提高了计算结果的准确性;最后通过合环仿真模型对理论分析进行仿真验证,结果表明所提计算方法具有较高的准确性,对实际合环操作具有一定的指导意义。Closed loop power supply has become an important way for 10 kV distribution network to transfer load,and the calculation of closed loop current is a necessary prerequisite for closed loop power supply operation.In order to ensure the smooth operation of closing loop,a calculation method for closing loop current of 10 kV distribution network is proposed in this paper.Firstly,the equivalent circuit of typical closed loop distribution system is established according to Thevenin′s theorem.Then,the superposition theorem is used to theoretically analyze the closed-loop steady-state current and inrush current.Considering the influence of the occurrence time and phase of the maximum closed-loop inrush current,the existing closed-loop inrush current calculation method is improved to improve the accuracy of the calculation results.Finally,the theoretical analysis is verified by the combined ring simulation model.The results show that the proposed calculation method has high accuracy and has certain guiding significance for the actual loop closing operation.

关 键 词：10 kV配电网 合环转供电 稳态电流 最大冲击电流 

分 类 号：TM417[电气工程—电器]