Modern Topology& Thermal Analysis of Drive for Variable Speed Pumped Storage Power Plant

Given the significant power generation and consumption of variable-speed pumped storage power plants (VSPSPs), it is crucial to enhance drive methods and decrease drive losses, thereby increasing productivity. This paper proposes the topology for VSPSP drivers with two level voltage source converters (2LVSC) with 6+1 converters. Hydraulic and electrical VSPSP models are presented, following which VSPSP driver is introduced. Likewise, drive switching and control method is described and 2LVSC (6+1) is introduced. Subsequently, VSPSP drivers with 6+1 modules are proposed as a novel topology. The thermal loss model of the driver is subsequently introduced and the thermal losses of one driver are simulated and evaluated. The simulation results demonstrate that the driver with 2LVSC (6+1) based on a direct torque and flux control (DTFC) scheme as a VSPSP driver results in decreased Mean Time to Between Failure (MTBF) and enhanced the speed of the repairing and maintenance in driver and VSP. Presented thermal model is shows the temperature of the driver stabilizes during the entire duty cycle. Eventually, the outputs of this project is simulated in MATLAB 2021/Plexim software and are validated and verified using the sample of variable-speed wind power plant (VSWP) with 2.2KW.