地区电网中环网短时合环操作分析研究

Analysis and Research on Short-time Loop Closing Operation of Ring Network in Regional Power Grid

针对地区电网中存在的双电源或多电源供电网络结构,分区供电方式下,负荷转移过程中产生的电磁环网现象,分析了电网短时合环操作过程中潮流变化情况及对系统的影响。讨论了在合环操作过程中影响潮流分布和电压变化的因素,给出了量化指标。提出了在满足电网安全稳定运行的前提下短时合环操作过程中需要关注的问题。最后以某石油电网为例,通过仿真分析计算出了在各种外部条件下的潮流转移比以及合环后对电网的影响,验证了相关结论,得到了短时合环操作的边界条件,对地区电网进行短时合环操作具有一定的参考意义。

Aiming at a network structure with double or more power sources in regional power grid and the electromagnetic loop network during load transfer, under the divisional power supply, the changing of power flow during short - time loop closing operation and its effects on system are analyzed. The factors that affect power flow and vohage variation in the process of loop closing operation are discussed. The quantitative indicators are given, and what to be concerned during loop closing operation on the premise of satisfying the safe and stable operation of power grid are proposed. Finally, taking an oil power grid for example, according to the simulation, the power flow transfer ratio is calculated as well as the effects on power grid after loop closing, the relevant conclusions are verified, and the boundary conditions of short - time loop closing operation are obtained. There is a certain reference value for short - time loop closing operation of regional power grid.