Abstract:In view of the traditional single-pump hydraulic transmission wind power generation system in complex operating conditions is often in the state of underpower operation, so that the whole unit work efficiency is low, a digital multi-pump hydraulic transmission system based on wind speed-pressure feedback was proposed. The corresponding pipeline pressures were obtained according to the different wind speed states, the cut-in number of hydraulic pump was controlled according to the pressure state, so that the multi-pump system could quickly respond to the system state changes, so the system status change could be quickly responded and the wind energy could be maximize converted into electric energy to improve the system efficiency. By connecting the energy storage system controlled by the solenoid switch valve between the multi-pump system and the hydraulic motor, assisting the multi-pump system to work, the transient energy storage function was provided to suppress the energy fluctuation of the hydraulic pipeline in a short period of time to improve the safety and stability of the system operation; the simulations were carried out through AMESim/Simulink. The results show that the designed multi-pump energy storage system can adapt the complex wind speed conditions, and the working efficiency and working stabitily are better than the traditional single-pump system.