弱受端直流换相失败预防控制改进策略

高压直流(high voltage direct current, HVDC)输电系统作为中国能源远距离传输的重要载体,其稳定运行对电网具有重要意义,一旦发生换相失败,将对电网暂态稳定产生恶劣影响。为解决现有换相失败预防控制(commutation failure prevention, CFPREV)在某些故障情况下启动不及时的问题,通过引入换相电流时间面积判据,提出了一种启动更加迅速的换相失败预防控制改进策略,以中国某省实际电网为研究对象,在电力系统全数字实时仿真系统(advanced digital power system simulator, ADPSS)中建立其混合仿真模型。仿真结果表明,所提改进措施使得电网内高压直流输电系统具有更强的换相失败抑制能力及故障恢复能力。

Research on Improved Commutation Failure Prevention Strategy for HVDC System Connect to a Weak System

High voltage direct current (HVDC) transmission system is an important carrier of long-distance energy transmission in China. Its stable operation is of great significance to the power grid. Once commutation failure occurs, it will have a huge impact on the transient stability of the power grid. In order to solve the problem that the existing commutation failure prevention (CFPREV) does not start-up in time under certain fault conditions, this paper proposes a faster start-up commutation failure prevention by introducing the current-time area method. Establish a complete hybrid simulation model of power grid in a certain province of China in Advanced Digital Power System Simulator (ADPSS), and the simulation results show that the improved commutation failure prevention enable the HVDC transmission system to have stronger commutation failure suppression capability and failure recovery capability.