EU-SysFlex blog: Batteries and EV charging points as electric grid balancers in a smart office environment


As part of EU-SysFlex, an office scale battery energy storage system (BESS) together with 8 electric vehicle (EV) charging points located in a smart office environment in Helsinki, Finland provided research platforms for Helen, an energy company in Finland and Helen Electricity Network, the DSO in Helsinki. The general objective of the demonstration is to show how small, distributed assets, such as EV charging stations and the BESS, can be aggregated and traded on the reserve markets of the transmission system operator (TSO, Fingrid in Finland) and/or utilized for the needs of the local distribution system operator (DSO in Helsinki). The Aggregator (Helen) is developing new products for their business portfolio. The BESS is rated as 120 kW / 134 kWh and each EV charger as 22 kW max power (AC).

The BESS is a versatile flexible asset when providing as well as peak power shaving, reactive power compensation and frequency containment reserve for normal operation (FCR-N). These functionalities were reliably and successfully tested during the demonstration period. Peak power shaving and reactive power compensation support the operation of the local distribution grid, and the service provision of FCR-N the operation of the power system. As part of this research, an operation strategy of these functions was presented. However, it was found out that many factors, especially power demand of the building, power tariffs and the prices of the FCR-N market affect the operational entity and profitability. During the tests the BESS was operated in a peak shaving mode during power tariff hours (Monday to Friday from 7 am to 9 pm) and in FCR-N control during night hours and weekends. Reactive power compensation was active all the time.

As a novel development stage, the BESS was controlled via…[read more]


Written by: Oliver Ojala, Pirjo Heine and Lauri Jännes from Helen.

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Disclaimer: blog entries reflect individual views of the author(s) that may not reflect official positions or communication of the project / project consortium.