The receiving-end hybrid cascaded multi-terminal HVDC system has a wide range of application scenarios because of its economy, flexibility and many other advantages. When an AC system failure occurs in receiving-end of an inverter VSC station, the power transmission capacity of the VSC is weakened, and during the fault, the continuous output power of the rectifier station will aggravate the power surplus on the DC side, resulting in a sharp increase in VSC converter voltage. After the failure, the system takes a long time to restore power to normal delivery, seriously affecting the normal operation and stability of the system. Aiming at the problem of overvoltage on the DC side and the power recovery problem when the AC fault occurs in the receiving end converter of the hybrid cascaded multi-terminal HVDC system, this paper proposes a voltage-power coordinated control strategy and an AC low voltage based on the change of the receiving end AC voltage. It uses real control and protection devices to build a hardware-in-the-loop simulation platform based on the RTDS simulation system, which verifies the feasibility of the proposed strategy. This work is supported by the Major Science and Technology Project of Henan Province: Research on Key Technologies and Equipment Development of VSC-UHVDC Power Transmission (No. 191110210900).