Transient Control Algorithm and Strategy of Controllable Shunt Reactors Individual Phase Suppressing Overvoltage and Secondary Arc Current

The paper proposed individual phase based capacity input strategy for controllable shunt reactor to suppress non-fault phase overvoltage in situation of unbalanced three-phase conditions,single phase earth fault and open phase operation of ultra/extra high voltage transmission line, which increased the voltage stability and control flexibility compared to traditional all-phase input method. In order to decrease the secondary arc current in extra/ultra high voltage transmission lines, improve the single-phase reclosing condition, a linkage control method for individual phase input and neutral reactor adjustment of controllable shunt reactor is proposed and verified by simulation in comparison of different control strategies and methods in the paper.