In a hybrid cascade UHVDC transmission system which the receiving end consists of a line commutated converter(LCC) in series with multiple parallel voltage source converters(VSC),the VSC has sub-module overvoltage problems when the AC grid fault. A method to suppress the overvoltage of the sub-module by installing energy-consuming devices on the DC side of VSC is proposed. The fault ride-through principles and strategies based on energy-consuming devices as DC Chopper,thyristor and controllable metal oxide surge arrester (CMOA) are compared and analyzed. Based on the PSCAD/EMTDC simulation platform,a hybrid cascade UHVDC simulation model containing the actual control and protection host program is built,and the AC fault ride-through characteristics based on three energy-consuming devices are compared and analyzed. The results show that the method of installing energy-consuming devices on the DC side of the VSC can effectively suppress the overvoltage of the sub-module and achieve reliable AC fault ride-through. The CMOA scheme has the advantages of simple control principle and high reliability,and it is suitable to be the energy-consuming devices for the hybrid cascade UHVDC transmission system which the receiving end consists of LCC and multiple VSC.