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Energies 2017, 10(3), 387; doi:10.3390/en10030387

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

1
Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
2
e-distribuzione Società per azioni (S.p.A.), Via Ombrone 2, 00198 Roma, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: William Holderbaum
Received: 14 February 2017 / Revised: 8 March 2017 / Accepted: 15 March 2017 / Published: 18 March 2017
View Full-Text   |   Download PDF [2646 KB, uploaded 18 March 2017]   |  

Abstract

The ever-growing penetration of local generation in distribution networks and the large diffusion of energy storage systems (ESSs) foreseen in the near future are bound to affect the effectiveness of interface protection systems (IPSs), with negative impact on the safety of medium voltage (MV) and low voltage (LV) systems. With the scope of preserving the main network stability, international and national grid connection codes have been updated recently. Consequently, distributed generators (DGs) and storage units are increasingly called to provide stabilizing functions according to local voltage and frequency. This can be achieved by suitably controlling the electronic power converters interfacing small-scale generators and storage units to the network. The paper focuses on the regulating functions required to storage units by grid codes currently in force in the European area. Indeed, even if such regulating actions would enable local units in participating to network stability under normal steady-state operating conditions, it is shown through dynamic simulations that they may increase the risk of unintentional islanding occurrence. This means that dangerous operating conditions may arise in LV networks in case dispersed generators and storage systems are present, even if all the end-users are compliant with currently applied connection standards. View Full-Text
Keywords: distributed generation; power regulation; energy storage systems (ESSs); interface protection system (IPS); unintentional islanding detection; network stability distributed generation; power regulation; energy storage systems (ESSs); interface protection system (IPS); unintentional islanding detection; network stability
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MDPI and ACS Style

Bignucolo, F.; Cerretti, A.; Coppo, M.; Savio, A.; Turri, R. Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks. Energies 2017, 10, 387.

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