Power system protection problems caused by grid connected PV systems

Bhattacharya, Subhashish (2014). Power system protection problems caused by grid connected PV systems MPhil Thesis, School of Information Technol and Elec Engineering, The University of Queensland. doi:10.14264/uql.2015.101

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Author Bhattacharya, Subhashish
Thesis Title Power system protection problems caused by grid connected PV systems
School, Centre or Institute School of Information Technol and Elec Engineering
Institution The University of Queensland
DOI 10.14264/uql.2015.101
Publication date 2014-11-30
Thesis type MPhil Thesis
Open Access Status Other
Supervisor Tapan Kumar Saha
Jahangir Hossain
Total pages 160
Language eng
Subjects 0906 Electrical and Electronic Engineering
Formatted abstract
Renewable energy sources are clean sources of energy which do not cause emission of greenhouse gases. Wind and solar power are the two most common sources of renewable energy. About two decades back active research work started on improving efficiencies of technologies employed in converting renewable energy sources into electrical energy. With the present concern about climate change and regulations for reduction in carbon-dioxide emissions, development of efficient systems for conversion of solar powers to electricity is considered as a subject of high importance. One of the most common technologies used to convert solar power to electrical power is solar photovoltaic (PV) cells. Proper utilization of solar power can lead to significant reduction of greenhouse gas emissions, but there are several problems associated with large scale generation of power using PV cells. Currently small units rated for individual residences to large megawatt rated PV power generation units are embedded throughout the distribution system. In conventional power distribution network, power is generated centrally and then distributed in a radial network. With distributed generation using PV cells, there are several points of power generation in a system. Conventional methods of protective relaying originally developed for radial distribution do not hold up well in all situations with distributed generators embedded in power system. This is due to the change in fault levels caused by the contribution from distributed generators during faults. Additionally there are several situations of unintentional islanding and problems associated with reconnection of distributed generator with utility. This thesis describes the research work carried out to analyse the protection problems associated with high penetration level of a PV type distributed generator. The main objective of this research work is to investigate the impact of incremental penetration of PV systems on protection issues of low voltage network in suburban distribution systems and to recommend measures to mitigate the protection problems. Photovoltaic generators of small and large sizes have been considered for the purpose of this investigation. Protection problems caused by single phase PV generator installed in individual residences as well as large three-phase PV generators installed in buildings with multiple apartments in a housing complex has been studied. Potential issues in protection system have been identified using a number of different case studies and mitigation measures have been recommended. Finally, future work to extend and further investigate the research has been suggested.
Keyword Photovoltaic (PV) system
Fault current
Protection coordination
Insulated gate bipolar transistor
Protection relays
Distributed generator
Circuit breaker
Overhead line

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Created: Sun, 23 Nov 2014, 17:05:39 EST by Subhashish Bhattacharya on behalf of Scholarly Communication and Digitisation Service