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曾在1998年肆虐全球的厄尔尼诺现象,造成了我国长江流域发生特大洪水。当时的华中电网500千伏主网架结构简单,线路较少(16条),汛期未发生500千伏设备跳闸事故,但部分地区低压线路、配变台区设备受损严重。17年过去了,电网发展迅猛,华中电网特高压呈现“四直一交”混联格局,“强直弱交”矛盾进一步显现,三大特高压大功率送电,百万千瓦级火电机组数量不断增加,3个千万千瓦级大型水电基地(三峡、向家坝—溪洛渡、官地—锦屏)全面建成,大容量机组异常运行对电网安全稳定运行的影响更加显著,各区域电网之间的相互影响和相
The El Niño, which wreaked havoc on the world in 1998, caused an extraordinary flood in the Yangtze River valley in our country. At that time, the main grid of 500 kV in Huazhong Power Grid had a simple structure with fewer lines (16 lines) and no trip of 500 kV equipment occurred in the flood season, but the equipment in low voltage lines and substations in some areas was seriously damaged. 17 years later, the power grid is developing rapidly, the UHV in Huazhong Power Grid presents the pattern of “four straight and one-off”, and the contradiction between “strong and weak” further shows. The three UHV high-power power transmission, The number of thermal power units is on the rise. Three large-scale hydropower bases with a capacity of 10 million kilowatts (Three Gorges Project, Xiangjiaba - Xiluodu and Guandi - Jinping) have been completed. The abnormal operation of large capacity units has a more significant impact on the safe and stable operation of the power grid. The interaction between power grids and phase