基于DIgSILENT计及负荷分布与三相不平衡的合环电流建模计算与试验分析  

Modeling Calculation and Experimental Analysis of Closed-Loop Current Based on DIgSILENT Considering Load Distribution and Three-Phase Imbalance

作　　者：罗勇 何宇霸 高文梅 陈诚 孙涛 陈世威 

机构地区：[1]贵州电网有限责任公司毕节供电局,贵州 毕节 [2]贵州大学电气工程学院,贵州 贵阳

出　　处：《建模与仿真》2024年第1期631-642,共12页Modeling and Simulation

摘　　要：为提高城市中压配电网合环转供电的成功率,本文提出一种考虑到中压馈线负荷分布以及三相不平衡的合环电流建模计算方法;首先对中压馈线合环稳态电流,冲击电流的理论分析,通过公式分析合环电流的产生原因以及影响合环电流的因素;其次结合理论分析通过DIgSILENT建立考虑不同负荷分布以及负荷处于三相不平衡状态合环电流计算仿真模型,最后通过仿真计算与现场2组合环试验对比,结果表明考虑三相不平衡以及负荷的不同分布情况下合环电流计算误差较低。可为实际合环操作提供一定的指导意见。To improve the success rate of ring network switching in urban medium-voltage distribution net-works, this paper proposes a modeling and calculation method for closed-loop current that takes into account the load distribution and three-phase imbalance in medium-voltage feeders. Firstly, theoretical analysis is conducted on the steady-state and impulse currents in the medium-voltage feeders, with a formulaic analysis of the reasons for closed-loop current generation and the factors influencing it. Secondly, combining theoretical analysis, a simulation model for closed-loop current calculation is established using DIgSILENT, considering different load distributions and the three-phase unbalance of loads. Finally, simulation results are compared with on-site ring switching tests for two groups, indicating lower calculation errors when considering three-phase imbalance and varying load distributions. This research provides practical guidance for actual closed-loop current operations.

关 键 词：负荷分布 DIGSILENT 三相不平衡 中压配电网 合环电流 

分 类 号：TM7[电气工程—电力系统及自动化]