The paper present a preliminary study of the protective relays of a 10 MW sized battery energy storage system (BESS) recently installed by TERNA, the Italian TSO. A complete model of the system, including inverters, has been implemented in ATP-EMTP in order to assess the behaviour of protective relays during symmetric and asymmetric faults. Results show that ground fault protection of MV feeders can be performed by zero-sequence non-directional overcurrent relays, obtaining a correct fault selection even for fault resistances in the kΩ range. Phase-to-phase and three-phase fault selection can be performed by means of overcurrent relays: an inverter current limiting control under fault conditions has to be implemented to avoid the system shutdown. Lastly, HV-level faults have been simulated during BESS-supplied, islanded operation, evidencing very low fault current contributions, depending on the actual share of battery modules operating at the time of fault, with less modules giving worst results.

Modelling of battery energy storage systems under faulted conditions: Assessment of protection systems behaviour / Gatta, Fabio Massimo; Geri, Alberto; Lauria, Stefano; Maccioni, Marco; Codino, Asia; Gemelli, G.; Palone, F.; Rebolini, M.. - ELETTRONICO. - (2016), pp. 1-6. ((Intervento presentato al convegno 16th International Conference on Environment and Electrical Engineering, EEEIC 2016 tenutosi a Firenze nel 2016 [10.1109/EEEIC.2016.7555651].

Modelling of battery energy storage systems under faulted conditions: Assessment of protection systems behaviour

GATTA, Fabio Massimo;GERI, Alberto;LAURIA, Stefano;MACCIONI, Marco;CODINO, ASIA;
2016

Abstract

The paper present a preliminary study of the protective relays of a 10 MW sized battery energy storage system (BESS) recently installed by TERNA, the Italian TSO. A complete model of the system, including inverters, has been implemented in ATP-EMTP in order to assess the behaviour of protective relays during symmetric and asymmetric faults. Results show that ground fault protection of MV feeders can be performed by zero-sequence non-directional overcurrent relays, obtaining a correct fault selection even for fault resistances in the kΩ range. Phase-to-phase and three-phase fault selection can be performed by means of overcurrent relays: an inverter current limiting control under fault conditions has to be implemented to avoid the system shutdown. Lastly, HV-level faults have been simulated during BESS-supplied, islanded operation, evidencing very low fault current contributions, depending on the actual share of battery modules operating at the time of fault, with less modules giving worst results.
9781509023196
9781509023196
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/935847
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