Modelling and analysis of grid integration for high shares of solar PV in small isolated systems- A case of Kiribati

Kumar , Sandip R. and Francisco, Gafaro and Daka, Andrew and Raturi, Atul K. (2017) Modelling and analysis of grid integration for high shares of solar PV in small isolated systems- A case of Kiribati. Renewable Energy, 108 . pp. 589-597. ISSN 0960-1481

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Abstract

Kiribati, a Pacific Island Country, is striving for high solar PV electricity into national grid in order to
reduce its unsustainable dependence on imported fossil fuel. This, however, can pose technical challenges
on the reliable operation of the small isolated system. In this work, a technical analysis was
carried out to investigate the implications of the planned pipeline of grid connected PV systems on
Kiribati’s Tarawa power system. Variations in PV output and corresponding spinning reserve requirements
to balance the short fall in the power output were analysed. The utility network was
modelled using the PowerFactory software. Steady state and dynamic analyses were then carried out for
the simulated scenarios. There were no major concerns identified at times of high load with high PV
output. For low system demand with high PV output, dispatch constraints were identified. The current
grid system will sustain maximum PV capacity above a load of 3250 kW but will require curtailment
below this load. Dynamic simulations showed that fast negative ramps in the PV output can lead to
frequency instability during a time of low demand and maximum PV output. The system is stable with
PV curtailed at 900 kW if low loads and maximum PV output conditions exist.

Item Type:	Journal Article
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
Depositing User:	Atul Raturi
Date Deposited:	29 Mar 2017 03:04
Last Modified:	29 Mar 2017 03:04
URI:	https://repository.usp.ac.fj/id/eprint/9699

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