有载调压变压器、电容器组和STATCOM的协调控制研究

针对变电站电压无功控制中，存在的变压器分接头和电容器组投切频繁以及电容器投切对系统电压造成一定的冲击问题，将静止同步补偿器（STATCOM）用于变电站电压/无功调节控制中，提出了离散设备优先动作，连续设备精细调节的控制策略，协调有载调压变压器分接头、电容器组与STATCOM之间的运行，在电压发生波动时，投入STATCOM实现对电压快速和平滑的调节；在正常运行时，STATCOM有足够的裕量。在修正后的IEEE-9系统中对提出的的控制策略进行仿真分析，结果表明，提出的协调控制策略能够有效地减少变压器分接头和电容器的投切次数，减小电容器投切时对系统电压造成的冲击。

Coordination Control of ULTC Transformer, Capacitor Banks and STATCOM

For voltage and reactive power control of substation,presence of transformer taps and capacitor banks switching frequently have certain impact on the system voltage.The static synchronous compensator(STATCOM) is used in the voltage/reactive power control of substation,and it is proposed for discrete device priority action,continuous fine adjustment device control strategy to coordinate the running of transformer taps,capacitor banks and STATCOM.STATCOM is put into operation to get fast and smooth adjustment of voltage when the voltage fluctuates.STATCOM has enough margins in normal operation.In the modified IEEE-9 system for the proposed control strategy simulation analysis,results showed that the coordination control strategy can effectively reduce the switching times of the transformer and capacitor,decrease the impact of capacitor switching on system voltage.