Minimising Unserved Energy Using Heterogeneous Storage Units
For power system operators, it provides a practical, optimal dispatch policy for storage to enhance security of supply.
This paper proposes a policy for dispatching heterogeneous energy storage units that minimizes unserved energy during supply shortfalls without requiring future knowledge, and validates it on the British power system.
This paper considers the optimal dispatch of energy-constrained heterogeneous storage units to maximise security of supply. A policy, requiring no knowledge of the future, is presented and shown to minimise unserved energy during supply-shortfall events, regardless of the supply and demand profiles. It is accompanied by a graphical means to rapidly determine unavoidable energy shortfalls, which can then be used to compare different device fleets. The policy is well-suited for use within the framework of system adequacy assessment; for this purpose, a discrete time optimal policy is conceived, in both analytic and algorithmic forms, such that these results can be applied to discrete time systems and simulation studies. This is exemplified via a generation adequacy study of the British system.