What is it about?
This paper presents a novel islanding prevention scheme of Grid-Connected Photovoltaic (PV) Systems in Matlab/ Simulink based on monitoring the dc-link voltage of the PV inverter. A 100kW PV System equipped with islanding protection like frequency relays, a rate of change of frequency (ROCOF) relay, and respectively the proposed dc-link voltage relay is simulated under the conditions of islanding and the detection time for all these Anti-Islanding (AI) techniques are compared. The study shows under which conditions our proposed dc-link voltage AI relay is the most efficient.
Featured Image
Why is it important?
The presented Anti-Islanding (AI) detection technique consists in monitoring the dc-link voltage, which raises significantly during transient grid faults. The raise detection can be implemented in the Voltage Source Converter (VSC) control of the photovoltaic (PV) inverter that monitors the dc-link voltage. The time for islanding detection of the dc-link voltage relay is compared with the detection time offered by the rate of change of frequency (ROCOF) and frequency relays.
Perspectives
Compared to the rate of change of frequency (ROCOF) and frequency relays, the Anti-Islanding (AI) technique using dc-link voltage relay has the fastest detection time. Also, the dc-link voltage, the ROCOF, and the frequency relays are triggered in the same order in all studied scenarios. During islanding condition, the dc-link voltage decrease with the increase of the connected load. A small variation of inductive power does not influence much the detection time of the AI relays.
Dr Ioan Viorel Banu
Universitatea Tehnica Gheorghe Asachi din Iasi
Read the Original
This page is a summary of: Islanding prevention scheme for Grid-Connected Photovoltaic systems in Matlab/Simulink, September 2014, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/upec.2014.6934698.
You can read the full text:
Resources
Contributors
The following have contributed to this page
