Operation and sizing of a hybrid power station consisting of PVs and battery energy storage

摘要

Incentives such as the favorable feed-in-tariffs, adopted in many countries for PV systems, along with the drastic reduction in the cost of photovoltaics over the last years, have resulted in the integration of high PV capacities in the power systems, giving rise to an array of well-known system planning and integration issues, such as the significant reduction in the apparent mid-day demand, the low capacity credit of RES energy and its stochastic variation, transmission and distribution congestion issues etc. The integration of storage is a promising option for RES stations, greatly enhancing the flexibility and predictability of their operation and facilitating their integration in power systems, especially in saturated ones. The storage facilities within a RES station enhance its output power "creditability", since primary energy variations can be effectively compensated, while the available energy becomes controllable and dispatchable by the station or system operator, e.g. with the potential to be timeshifted to the hours of peak demand. In this paper, the concept of a PV-battery station is explored, from an energy efficiency and economic viability perspective. A step-by-step simulation model is employed to simulate the operation of the station using annual time series. Results are presented concerning the operation of such a plant and the sizing of its components.