  Pumped storage hydro units (PSHU) can provide flexibility to power systems.
This becomes particularly valuable in recent years with the increasing shares
of intermittent renewable resources. However, due to emphasis on thermal
generation in the current market practices, the flexibility from PSHUs have not
been fully explored and utilized. This paper proposes a configuration based
pumped storage hydro (PSH) model for the day-ahead market, in order to enhance
the use of PSH resources in the system. A strategic design of incorporating and
fully optimizing PSHUs in the day-ahead market is presented. We show the
compactness of the proposed model. Numerical studies are presented in an
illustrative test system and the Midcontinent Independent System Operator
(MISO) system.
