Multi motor switching control strategy for vertical matrix gravity energy storage system considering charging and discharging characteristics

Gravity energy storage charges and discharges power/energy in the energy storage system by using height differences to raise and lower solid heavy energy storage media. The gravity energy storage system’s electric motor’s single machine capacity is limited, thus in order to satisfy the grid’s charging and discharging needs during significant power fluctuations, the system must employ many motors operating in parallel. In order to fulfill the power grid’s demands for energy charging and discharging, it is crucial to examine the power distribution strategy of each machine in the gravity energy storage system when many motors are operating in tandem. This study examines the operation state switching control technique of a gravity energy storage multi motor system that satisfies the grid’s power charging and discharging criteria in order to address this problem. This article builds a vertical matrix type gravity energy storage multi motor grid linked system model, two control strategies for varying the operating state of gravity energy storage multi-machine systems that adjust to various power fluctuation characteristics of the power grid are suggested, taking into account the power fluctuation characteristics of the power grid as well as the power/energy charging and discharging characteristics of the gravity energy storage system; In order to confirm the efficacy of the suggested control technique, a vertical matrix gravity energy storage system model was built using PSCAD/EMTDC, and the simulation results under two control strategies were compared and examined.