摘要
为了提高供电可靠性,电力调度机构经常需要对电网进行合环操作,由于合环两端存在电压差,合环操作会产生合环稳态电流和合环冲击电流,导致参与合环的馈线电流过大,严重时可能引起继电保护误动作,造成大面积停电。因此需要对合环电流进行详细的分析。而计算合环电流有许多方式,本文针对某地区典型配电网环路,分别以人工计算和仿真模拟的方式计算合环电流,以供参考,仿真模型的方式计算合环电流不但时间上要短于人工计算方式,且可重复利用,效率非常高。同时仿真模型的准确性得到系统实际电压、人工计算稳态电流及合环冲击电流的验证。因此,采用仿真计算合环电流的方式值得推广。
With the development of social economy, the reliability of power supply is increasing, and the quality of power supply is more and more sensitive. It is a very good way to minimize the power cut and loop operation to make the power system operate under the bi-directional power supply mode of the distribution network. Due to the pressure difference between both ends of the loop, closed loop operation will produce closed loop current loop current value and impact value, may cause in the feeder current loop is too large, the line passing through the load, or lead to malfunction of relay protection, causing blackouts, hence the need for a detailed analysis on the current loop. The calculation of closed loop current in many ways, aiming at a typical distribution network loop regions, respectively by artificial calculation and simulation method to calculate the closed loop current analysis, both the time of statistics, the simulation model of closed loop current calculation not only time shorter than the manual computation, and can repeated use, its higher efficiency conclusion. At the same time, the accuracy of the simulation model is verified by the actual voltage of the system, the calculated steady state current and the loop impulse current. Therefore, the simulation model is built to simulate the loop current, so it is worth popularizing.
作者
张昊
艾惠利
ZHANG Hao;Ai Huili(Mengla Xishuangbanna Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Xishuangbanna,Yunnan 66630Q China)
出处
《云南电力技术》
2018年第4期15-18,共4页
Yunnan Electric Power
关键词
合环电流
MATLAB
仿真建模
Loop closing current in distribution network
MATLAB
Simulation modeling
