Multi-valve control cascade valve control system and method

The invention provides a multi-valve-control cascaded valve control system and method. The multi-valve-control cascaded valve control system comprises a plurality of valve control units which are cascaded in sequence; each stage of valve control unit is connected with a plurality of converter valve modules and is used for receiving valve module information uploaded by the converter valve modules and controlling the converter valve modules according to the valve module information and a control instruction; the first-stage valve control unit is connected with the control protection system and is used for summarizing and processing valve module information and valve control unit state information of each stage of valve control unit, sending the information to the control protection system and receiving a control instruction issued by the control protection system; the upper level and the lower level of the non-first-level valve control unit are in dual-redundancy communication connection and are used for receiv