Optimization of Variable Speed Pumped Storage Unit Based on Magnetic Gear Flexible Transmission Structure

With the development of power electronics, the full-power variable-speed pumped storage unit (VSPS) has gradually become an important equipment to ensure the security, stability and flexibility of the future power grid. However, there are some common problems in the existing full-power VSPS such as easy damage to the shaft, poor frequency response characteristics. These problems restrict the application of the full-power VSPS. In this paper, the magnetic gear flexible transmission structure is introduced to replace the traditional coaxial connection structure, and the control strategy to improve the frequency response characteristics of the unit is put forward. Through theoretical analysis and simulation verification, the scheme proposed in this paper effectively solves the above problems and improves the reliability, flexibility and economy of the full-power VSPS.