Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter

The present invention relates to a modular multi-configuration HVDC flexible protection system-level converter, the method using the sub-module layer, and a layer of converter valves three transducer protection layer disposed station; submodule protection layer disposed on the sub- the controller module; converter valve layer for the single-fault protection in the converter valve disposed in the valve group controller VBC; function for the failure to change protective layer, and a station in a system of the DC system control and protection equipment in the PCP implementation, this the method of the invention provides the flexible HVDC fast operation in the abnormal condition protection, to prevent excessive stress of continued development, and isolate faulty components.