Ricerc@Sapienza

The decarbonization process of the Sardinian network will lead to the shutdown of the existing coal power plants, significantly reducing system inertia. This will also affect the operation of the - now crucial - HVDC links connecting the Sardinian system to the European transmission network, due to the lower short circuit ratio as well as to possible commutation failure issues. Among other measures aimed at coping with this issues Terna, the Italian transmission system operator, is installing two new Synchronous Condensers / Flywheel Systems (SCFSs) in Selargius 400 kV substation.

A critical aspect of distributed generation systems focuses on the installation of Electrical Energy Storage Systems in customer-side facilities. In this scenario, flywheel technology is challenged to provide high levels of safety, compactness and competitive cost. This work presents a novel, one-body flywheel scheme based on a switched reluctance machine, whose laminated rotor fulfils both the motor/generator and energy storage functions. The one-body architecture enhances compactness and robustness, whereas the laminated rotor ensures high safety.

This paper compaerethe analytical mathematical model of active magnetic bearings (AMBs) with a FEM based model, developed in the framework of the Ansys©software. In both analyses, attention will be given to the force generated by the bearings on the rotor of a synchronous machine coupled with a flywheel (the purpose of this system is the storage of energy using all the possible advantages offered by AMBs). Firstly, it is necessary to represent the basic mathematical model of an AMB and its application on both flat and cylindrical geometry.