Multicriteria Design Process for Outer-Rotor Kinetic Energy Storage Systems

Due to the global energy transition, energy storage capacities are necessary. Kinetic energy storage systems can be used to provide valuable grid services but have to be redesigned to fulfill this task. A structured process is necessary in order to cope with the complexity of those systems and to maximize performance and profitability. This multicriteria design process is described in detail for an outer-rotor kinetic energy storage system. The approach is based on a detailed system model consisting of the several sub-models. It incorporates the design of the drive system, the magnetic bearing system, as well as the composite rotor. This approach enables the use of optimization algorithms in order to find systems matching the application specific objectives such as minimal operational losses or a maximal energy density. The multicriteria design process is then applied to an exemplary application.