| Abstract |
Power generation and distribution are expected to become increasingly decentralized and include a significant portion of renewables, at least on parts of the grid. Energy storage by means of electrochemical accumulators can fulfill a variety of functions and contribute to the successful and growing integration of renewables into our electricity landscape. The presentation will browse the spectrum of energy storage applications in decentralized networks from energy dispatching to grid stabilization, including: oGrid connected photovoltaic systems oWind-diesel hybrid systems oStabilization of medium voltage grids On one end of the spectrum, typically in PV applications, dispatching energy consists of storing energy at its time of production, and to release it at a time of use. On the other end, energy storage can stabilize a grid (voltage, frequency) by simply smoothing very short term variations between generation and use of energy and power (typically milliseconds to a few minutes). In reality, there is a continuum of variations between the two ends of this spectrum, depending on the characteristics of the generating source(s), the load(s), and the grid or micro-grid. We will analyze the functional requirements (operating pattern, typical voltages, power, etc.) of different real applications and explain how to select and size an adequate battery solutions, providing details on battery technology, operational performance, life time, economical analysis and perspectives. We will refer only to existing cases and report about operational experience and lessons learnt. |
