抽水蓄能机组背靠背启动过程中机组励磁配合

Excitation Systems Coordination for Back-to-Back Starting for Pumped Storage Units

在背靠背启动过程中,机组的励磁配合是需要解决的一个关键问题。该文根据同步电机的状态方程,建立了抽水蓄能机组背靠背启动的数学模型。基于上述模型,对包括正常启动和启动过程中电动机突然灭磁和制动等工况下抽水蓄能机组的背靠背启动过程进行仿真研究。基于分析背靠背启动的仿真结果,发现背靠背启动中两机励磁系统配合存在的问题,并提出相应的解决方案。通过在LCU与保护回路之间增加逻辑控制的硬接线回路保证两机同时灭磁,解决了两机灭磁次序问题。

In the process of back-to-back starts, the excitation systems coordination between two units is a key issue. Using the state equations of synchronous motor, a mathematical model of back-to-back starting was established in this paper. Based on above research, back-to-back starting process for pumped storage units under different conditions were simulated, which includes the normal starting and starting processes with motor de-excitation and braking and so on. With the research of simulations, the problems of excitation systems coordination between two units were recog- nized, and an appropriate solution for this problem is proposed. By adding a hard-wire circuit between LCU and the tripping circuit and each of these circuits is added with an additional relay, two excitation systems can be removed si- multaneously.