Impact of Distributed Generation Grid Code Requirements on Islanding Detection in LV NetworksReportar como inadecuado


Impact of Distributed Generation Grid Code Requirements on Islanding Detection in LV Networks


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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: Ying-Yi Hong

Abstract The recent growing diffusion of dispersed generation in low voltage LV distribution networks is entailing new rules to make local generators participate in network stability. Consequently, national and international grid codes, which define the connection rules for stability and safety of electrical power systems, have been updated requiring distributed generators and electrical storage systems to supply stabilizing contributions. In this scenario, specific attention to the uncontrolled islanding issue has to be addressed since currently required anti-islanding protection systems, based on relays locally measuring voltage and frequency, could no longer be suitable. In this paper, the effects on the interface protection performance of different LV generators’ stabilizing functions are analysed. The study takes into account existing requirements, such as the generators’ active power regulation according to the measured frequency and reactive power regulation depending on the local measured voltage. In addition, the paper focuses on other stabilizing features under discussion, derived from the medium voltage MV distribution network grid codes or proposed in the literature, such as fast voltage support FVS and inertia emulation. Stabilizing functions have been reproduced in the DIgSILENT PowerFactory 2016 software environment, making use of its native programming language. Later, they are tested both alone and together, aiming to obtain a comprehensive analysis on their impact on the anti-islanding protection effectiveness. Through dynamic simulations in several network scenarios the paper demonstrates the detrimental impact that such stabilizing regulations may have on loss-of-main protection effectiveness, leading to an increased risk of unintentional islanding. View Full-Text

Keywords: distributed generation DG; power regulation; fast voltage support FVS; inertia emulation; interface protection system IPS; islanding detection; unintentional islanding distributed generation DG; power regulation; fast voltage support FVS; inertia emulation; interface protection system IPS; islanding detection; unintentional islanding





Autor: Fabio Bignucolo 1,* , Alberto Cerretti 2, Massimiliano Coppo 1, Andrea Savio 1 and Roberto Turri 1

Fuente: http://mdpi.com/



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