Fast excitation control strategy for typical magnetically controllable reactor for reactive power compensation

•Improve the response speed of the Magnetically Controllable Reactor.•Rapid Magnetization and demagnetization strategy for slow response Magnetically Controllable Reactor.•The strategy to improve the response speed without changing the structural windings of the Magnetically Controllable Reactor.•The proposed strategy is suitable for all the traditional Magnetically controllable reactor used in UHV transmission lines.