电网黑启动初期优先启动HVDC输电系统的方法

The Method of Priority Starting HVDC Power Transmission System in the Early Stage of Power Grid Black-start

基于高压直流(HVDC)输电系统的融冰运行模式,提出了仿融冰模式HVDC输电系统黑启动技术,突破了因晶闸管半控器件和交流电网薄弱环境而限制HVDC输电系统直接参与电网黑启动技术的瓶颈。提出了仿融冰模式的概念,分析了双极仿融冰模式黑启动运行实现过程,研究了黑启动过程中受端换流站和受端电网启动要求以及直流系统启动过程,最后以工程实例进行了仿真,论证了双极仿融冰模式HVDC输电系统直接参与电网黑启动技术的可行性,所提技术有效避免了输送功率对交流电网的冲击,注入交流电网功率连续可调,可实现直流输送功率与受端网架和负荷恢复过程同步,对加快电网在大停电事故后,受端电网负荷、电源和网架的快速恢复起到积极作用,具有重要的现实意义。

A black-start technology of high voltage direct current（HVDC） power transmission system based on pseudo- deicer startup mode is proposed by analyzing HVDC deicer operation mode, which breaks through the technical bottleneck of HVDC power transmission system could not be firstly involve in the grid black-start due to the half-con- trolled thyristor device and the weak environment of AC grid.The conception of pseudo-deicer startup mode is proposed for the first time, and its black-start implementation process is given.In addition, the startup demand of HVDC system inverter station,the AC grid,and the startup process of the HVDC system are researched.Finally,the feasibility of the black-start technology of HVDC power transmission system based on pseudo-deicer startup mode is demonstrated by simulation.The proposed technology effectively avoids the impact of HVDC transmission power to the AC grid in the black-start beginning, and the transmission power is continuously adjustable, which could realize the synchronization between the transmission power with the recovery process of AC grid and load.It plays a positive role and has important practical significance to speed up the grid rapid recovery after large-scale blackout accidents.