摘要
中压配电网合环操作可能会产生较大的合环稳态电流与合环冲击电流,将对电网的安全稳定运行造成巨大影响。为验证在实际工程中合环判别的适用性,提出了一种基于合环电流的中压配电网合环判定方法。首先,对叠加法和公式法两种合环稳态电流计算方法进行了分析,推导了最佳频率下合环冲击电流的解析公式。然后,结合合环的稳态电流与冲击电流构建合环判别指标,以实现判定电网合环是否成功。借助DIgSILENT/PowerFactory仿真软件,案例分析在一个西南某地区实际中压配电系统中开展,仿真结果表明,构建的合环判别指标能快速高效地判断配电网是否能进行合环。
The loop closing operation of the medium voltage distribution network may generate a large loop closing steady-state current and loop closing impulse current,which will have a huge impact on the safe and stable operation of the power grid.In order to verify the applicability of the loop closure judgment in the practical engineering,a method for medium voltage distribution network closure judgment based on the loop closure current is proposed in this paper.First,two calculation methods of the closed loop steady-state current are analyzed by the superposition method and the formula method,and the analytical formula of the closed loop impulse current at the optimal frequency is deduced.Second,combining the steady-state current of the loop closure with the inrush current,a loop closure discrimination index is constructed to determine whether the grid loop closure is successful.With the help of DIgSILENT/PowerFactory simulation software,a case study is carried out in an actual medium-voltage power distribution system in a certain area in Southwest China,and the simulation shows that the constructed loop closure judgment index can quickly and efficiently judge whether the distribution network can be looped.
作者
罗玉飞
黄滔滔
LUO Yufei;HUANG Taotao(School of Electrical Engineering,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《电网与清洁能源》
北大核心
2021年第6期51-59,共9页
Power System and Clean Energy
基金
贵州省科学技术基金项目(黔科合基础[2019]1100)。
关键词
中压配电网
合环电流
最佳频率
DIGSILENT
medium voltage distribution network
closingloop current
optimal frequency
DIgSILENT
作者简介
罗玉飞(1995-),男,硕士研究生,主要研究方向为配电网规划与运行;黄滔滔(1995-),男,硕士研究生,主要研究方向为配电网规划与运行。
