配电网安全边界的产生机理

The Formation of Distribution Network Security Boundaries

该文研究揭示了配电网安全边界的形成机理。首先,定义了元件间的拓扑距离,根据N-X后两馈线是否产生电气连接以及故障后负荷转带路径的不同,将馈线联络关系归纳为3大类:N-1联系、N-2联系和无联系,并细分为7种。其次,在观测馈线来自同一主变和不同主变的两种情况下,分析了斜线边界、直线边界的产生原因,得出边界数量计算公式。最后,总结得到7种网络结构与完整安全边界二维视图的对应表,能无需仿真绘制安全域图像或解析列写边界方程,直接按网络结构查表确定安全边界的基本图像。总结发现了安全边界的形成机理和规律:当且仅当馈线联络为N-1联系时才会出现斜线边界;而直线边界总是存在。边界数由常量和变量两部分构成,斜线数常量随拓扑距离增加而减少,直线数常量则相反。

The formation of the distribution network security boundary was explored in this paper. Firstly, topological distance between two components was defined. According to whether an electrical contact occurs between two feeders after N-X and load transfer path after faults, the feeder connection was subdivided into seven types and grouped into three categories namely N- 1 links, N-2 links and non-links. Secondly, under the same and different main transformer power supply situation, formation and quantity formulas of the diagonal and straight line boundaries were discussed. Finally, the 2D view of security boundary matching seven typical distribution networks was summarized. Security boundary can be figured through the 2D view list without simulation or writing boundary equations Research shows that the security boundary of three feeder connection categories includes straight lines, if and only if the N- 1 links includes diagonal lines. The security boundary number is composed of constant and variable, and the constant of diagonal line number increases with topological distance while the constant of straight line number reduces.