On the usage of hybrid storage systems for the provision of services for local grids

Hybrid power plants are emerging as an adequate solution to address emerging power system needs, since they can provide a wide palette of services by leveraging the capabilities of different technologies. At the same time, storage has been recognized as a critical component for the energy transition, in order to deal with the new characteristics of inverter-based generation. In particular, it is becoming clear how a storage system can provide certain grid services, but how to extend these ideas to hybrid storage systems is not fully understood. In this work we present an optimization-based framework that is able to deal with the typical fast time scales associated with storage, at a reasonable computational cost. The approach relies on piecewise affine linear approximations, that can be reformulated as mixedinteger linear programs. An example focused on peak shaving shows the benefits of the proposed approach.