大型调相机惰转并网过程中的励磁控制策略

The excitation system control strategy for running down grid-connection of large capacity synchronous condenser

根据换流站加装调相机的特点,调相机励磁系统配置一套他励源的起动励磁及一套自并励的主励磁,起动励磁和主励磁需要在惰转期间快速完成直流侧切换,以实现调相机惰转并网。本文提出一种调相机惰转并网过程中的励磁控制方法,通过相应励磁调节器的协调控制,实现两段式升压,完成惰转过程中起动励磁和主励磁的快速切换。目前,本控制方法已成功应用于扎鲁特换流站调相机。实践证明,此方法能够在惰转期间快速无扰动的实现切换并完成升压,减小了大型调相机并网时因电压差导致的冲击,对大型调相机的安全、高效、可靠运行具有重要意义。

According to the characteristics of additional synchronous condenser at converter station, the excitation system for synchronous condenser is configured with starting excitation which is auxiliary excited and main excitation which is self-excited. The starting excitation and main excitation need to quickly switch at DC side during coasting of the synchronous condenser, in order to achieve running down grid-connection. In this paper, a method of controlling the excitation in the process of running down grid-connection is proposed. Through the coordinated control of the corresponding excitation regulator to achieve two-stage voltage raised, to switch fast from starting excitation to main excitation. Now this method has been successfully applied to Zhalute converter station. It is proved that this method can realize switch and voltage raised fast and without disturbance during coasting of the synchronous condenser. It also can reduce the impact caused by the voltage difference when the large-scale synchronous condenser is connected to the grid. It is of great significance to the safe, efficient and reliable operation of the large-scale synchronous condenser.