Abstract: DC energy dissipation device is crucial in the offshore wind power plants connected through flexible high voltage direct current transmission systems. It is used to absorb the surplus power fed by the wind farms to prevent system from overvoltage when onshore grid encounters failures. A universal DC bus voltage hysteresis control strategy is proposed for the MMC-type and hybrid energy dissipation devices, which can significantly reduce the electrical and thermal stresses applied to the capacitors, resistors and IGBTs inside submodules, thus achieving a lower cost and lighter weight equipment design. An equivalent mathematical model of a flexible dc system integrating energy dissipation devices has been established, revealing the mechanism of the influence of control parameters on transient overvoltage and thermal stress of energy dissipation devices in the system. A detailed design method for control parameters is provided. Finally, a ±250 kV/1 500 MW offshore wind grid connected system model is built in the Matlab software environment to verify the correctness of the above content. The simulation results show that the proposed control strategy has good system characteristics, which can reduce the number of sub modules required for MMC type energy dissipation devices by 37%, reduce capacitance values by 75%, and reduce internal resistance heating of hybrid energy consumption devices by 97.7%, thereby removing the need for water cooling and heat dissipation.