电网严重故障下的电压稳定应对措施分析

Analysis of voltage stability countermeasures under a severe fault in a power grid

台风、雷电和冰灾等自然灾害现象难预测、不受控。这些灾变天气不仅严重影响人们的生产生活,而且也给电网运行带来危害,因此越来越受重视。2019年8月9日英国发生的雷击引发停电事件,再次给国内外电网运行安全敲响了警钟。首先分析了英国8.9大停电事件发展过程,揭示雷击引起的系统电压下降、频率下跌的连锁反应情况。接着研究了含风电的电力系统电压稳定性及无功补偿容量计算方法,并以某典型地区电网为例,对严重故障下的电网稳定性进行仿真分析。提出防止系统电压失稳的应对措施,最后给出提高电网运行安全稳定性的相关措施建议。

Natural disasters such as typhoons,lightning and ice disasters are difficult to predict and control.These catastrophic weather events not only seriously affect people's production and life,but also bring harm to the operation of the power grid,so an increasing amount of attention has been paid to them.Lightning strikes in the UK on August 9,2019 caused a power outage.This once again sounded the alarm for the safety of domestic and foreign power grid operation.This paper first analyzes the development process of the 8.9 blackout in the UK,and reveals the chain reaction of system voltage drop and frequency drop caused by the lightning strike.Then the voltage stability and reactive power compensation capacity calculation method of a wind power-containing power system is studied.Taking a typical regional power grid as an example,simulation analysis of power grid stability under severe faults is made.This paper puts forward countermeasures to prevent system instability under catastrophic weather events.Finally,it provides relevant measures and suggestions for improving the safety and stability of power grid operation.