上海庙-山东特高压直流接入对宁夏电网的影响

为了研究分析 2017 年内蒙上海庙-山东特高压直流接入宁夏电网后对宁夏电网安全稳定运行产生的影响,分别从短路电流水平、直流短路比、暂态稳定特性、直流次同步振荡风险等多个方面进行了仿真分析。仿真结果表明:上海庙直流接入宁夏电网后会导致宁夏电网短路电流整体上升、直流送端系统有效短路比低、直流双极闭锁安稳装置拒动后系统失稳、直流配套电源存在次同步振荡风险等问题,建议加强蒙西电网网架,从其自身网架支撑该直流送出。

Influence of UHV DC power transmission from Shanghai Temple to Shandong accessing on Ningxia power grid

In order to research and analyze the influence of safe and steady operation on Ningxiapower grid after UHV DC from Shanghai Temple of Inner Mongolia to Shandong will connect withNingxia power grid in 2017,separately makes simulation analysis on short circuit current level,DCshort circuit ratio,transient stability performance and DC subsynchronous oscillation risk,etc. Thesimulation result shows that Shanghai Temple DC accessing Ningxia power grid will lead to thefollowing problems:Ningxia power grid short circuit current will be overall increase,effective shortcircuit ratio of DC transmission terminal will be low,after DC bipolar blocking safe device refusedto move,the system will lose stability and DC matched power sources will exist subsynchronousoscillation risk,etc. So suggests that strengthening the network structure of west of Inner Mongoliapower grid,using its own network structure support DC transmission.