  The objective of this work is to reduce the storage dimensions required to
operate a coupled photovoltaic (PV) and Battery Energy Storage System (BESS) in
an electricity market, while keeping the same level of performance. Performance
is measured either with the amount of errors between the energy sold on the
market and the actual generation of the PV/BESS i.e. the imbalance, or directly
with the revenue generated on the electricity market from the PV/BESS
operation. Two solutions are proposed and tested to reduce the BESS size
requirement. The first solution is to participate in electricity markets with
an aggregation of several plants instead of a single plant, which effectively
reduces the uncertainty of the PV power generation. The second is to
participate in an intra-day market to reduce the BESS usage. To evaluate the
effects of these two solutions on the BESS size requirement, we simulate the
control of the PV/BESS system in an electricity market.
