抑制直流连续换相失败的调相机紧急控制

Emergency Control of Synchronous Condenser to Suppress DC Continuous Commutation Failure

多直流馈入受端电网的换相失败是威胁系统安全的重要问题,为增强系统的动态无功支撑能力,降低直流换相失败概率,国家电网有限公司将在全网部分直流换流站内配置一定数量的调相机。文中首先分析了调相机投运对电网直流换相失败特性的影响,针对常规调相机控制方式在抑制直流连续换相失败方面的不足,分析了调相机紧急控制对抑制直流连续换相失败的效果。根据实际电网中直流连续换相失败特点及控制要求,设计了预防直流连续换相失败的调相机紧急控制系统架构,并提出了调相机紧急控制的实现方法,基于实际电网仿真验证了所提控制架构和方法的有效性。

DC commutation failure of the multi-infeed DC system is an important issue that threatens the security of power grid. In order to enhance the dynamic reactive power support capability of the system and reduce the probability of DC commutation failure, the SGCC will allocate a certain number of synchronous condensers in some DC converter stations of the whole network. In this paper, the impact of the commissioning of the synchronous condensers on the DC commutation failure characteristics is analyzed. In view of the shortcomings of the conventional control mode of the synchronous condensers in suppressing the continuous commutation failure of the DC, the effect of the synchronous condensers in the emergency control on the DC continuous commutation failure is analyzed. According to the characteristics of the continuous commutation failure and the control requirements, the emergency control system architecture for preventing DC continuous commutation failure is designed, and the realization method of the emergency control of the synchronous condensers is put forward. The effectiveness of the proposed control architecture and method is verified based on the real grid simulation.