摘要
随着受端电网直流馈入规模不断提升,交直流系统耦合紧密、动态无功支撑下降,容易引发连锁故障。针对上述问题,基于浙江交直流混联电网运行特征,首先分析了宾金、灵绍特高压直流近区交互特性,总结得到影响直流换相失败的关键故障,并根据短路电流贡献值排序得到支撑换流站的关键机组。在此基础上,提出了特高压直流近区最小开机计算方法,用以预防交流电网严重故障连锁导致的直流闭锁,并通过BPA仿真算例验证。本文相关研究结论已用于实际电网运行方式安排,证明可提升交直流混联电网安全稳定水平。
With the increasing scale of DC power fed in receiving end power grid, coupling between AC and DC become closer while dynamic reactive power compensation supporting ability become weaker, it is more likely to result in cascading failures. In the response to above problem,interactive features of Binjin and Lingshao power transmission projects are analyzed based on the operational characteristics of Zhejiang hybrid UHVAC/DC power grid. The critical emergencies and crucial generators to commutation failure in multi-infeed HVDC transmission systems are also elaborated. The method of generator operation mode optimization is proposed for the nearby areas of HVDC receiving end power grid to avoid DC blocking faults caused by severe AC cascading failures. The software BPA is used to simulate and verify. The analysis results have been applied to the operation mode of actual power grid, it is proved that the system can improve the voltage level of AC/DC hybrid power grid.
出处
《陕西电力》
2017年第4期55-59,共5页
Shanxi Electric Power
关键词
浙江电网
交直流混联
换相失败
直流闭锁
最小开机
Zhejiang power grid
AC/DC hybrid system
commutation failure
DC blocking fault
optimal generator operation model
