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Paper RSE 16003195

Battery Energy Storage Systems for the Provision of Primary and Secondary Frequency Regulation in Italy

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16 IEEE International Conference on Environment and Electrical Engineering 7-10, Giugno-2016.

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M. Benini (RSE SpA) , D. Cirio (RSE SpA) , A. Gatti (RSE SpA), S. Canevese (RSE SpA)

MERCATI ELETTRICI 2016 - Evolution of interconnected electrical systems and integration of the markets

This work is focused on the possible provision of primary and secondary frequency regulation in Italy by Battery Energy Storage Systems (BESSs), either in a stand-alone configuration or supporting wind or photovoltaic power plants. Considering a time series of frequency measured in the continental European grid and a time series of the output of the centralized secondary controller of the Italian mainland (published by Terna), the energy exchanges between a BESS and the power grid are computed, and a preliminary economic assessment is carried out.

Currently, Non-Programmable Renewable Energy Source (NPRES) generation contributes significantly to demand supply, but participation to ancillary services is still limited to emergency support (e. g. curtailment energy production in case of over-generation, fast active power reduction in case of large over-frequency transients). Battery Energy Storage Systems (BESSs) can be employed to support the NPRES energy supply and ancillary services provision, allowing to enhance NPRES integration into the power system and to contribute to system reliability and security of supply.

This work is focused on the provision of primary and secondary frequency regulations by BESSs, either in a stand-alone configuration or supporting wind or photovoltaic power plants, with particular reference to the Italian system. Simulation results are presented, considering a time series of frequency measured in the continental European grid and a time series of the output of the centralized secondary controller of the Italian mainland (the latter series is published by the Italian TSO, Terna). The energy exchanges between a BESS and the power grid are shown, then a preliminary economic assessment is carried out.

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