Using magnetically controlled reactor as an implementation of automatic voltage regulation system of the regional power grid can not only avoid the issue of switching overvoltage due to frequent switching of traditional parallel reactors

but also can realize the continuous smooth regulation of the system reac-tive power. In this paper

the MCR at a 220kV substation in a regional power grid of Hangzhou is taken asan example

the technical proposal of MCR involving in the interconnection coordination control for AVCsystem is introduced and the control principle and the strategy are described. It is shown by the engineeringpractice result that MCR in the substation can response quickly and accurately the control command issuedby the AVC system and the set control strategy is effective and reliable.