  In this paper, we propose a control framework for a battery energy storage
system to provide simultaneously multiple services to the electrical grid. The
objective is to maximise the battery exploitation from these services in the
presence of uncertainty (load, stochastic distributed generation, grid
frequency). The framework is structured in two phases. In a period-ahead phase,
we solve an optimization problem that allocates the battery power and energy
budgets to the different services. In the subsequent real-time phase the
control set-points for the deployment of such services are calculated
separately and superimposed. The control framework is first formulated in a
general way and then casted in the problem of providing dispatchability of a
medium voltage feeder in conjunction to primary frequency control. The
performance of the proposed framework are validated by simulations and
real-scale experi- ments, performed with a grid-connected 560 kWh/720 kVA
Li-ion battery energy storage system.
