Power control strategy of slope gravity energy storage system based on permanent magnet synchronous motor

Abstract Slope-based solid gravity energy storage has garnered significant attention due to its geographic flexibility and configurational versatility. This study presents a novel slope gravity energy storage system control method employing a PMSM coupled with an innovative power stabilization strategy to mitigate grid-side power fluctuations. The proposed approach integrates a tri-level control architecture encompassing power regulation, DC bus voltage maintenance, and speed optimization leveraging the system’s inherent kinetic energy and electromechanical characteristics to ensure stable grid-side power output during discrete weight operations. Validation through a 100 kW PMSM-based slope gravity energy storage simulation model demonstrates the efficacy of the devised approach. Results confirm consistent grid-side power output with minimal weight speed fluctuations, effectively eliminating the power impact of discrete weight operations on the grid interface.