| || || Pratap, Rekha Devi|
| || || Wind/diesel hybrid micro-grid for a remote Fijian village |
Author: Pratap, Rekha Devi
Institution: University of the South Pacific.
Subject: Remote area power supply system -- Fiji, Rural electrification -- Fiji, Electric power distribution -- Fiji
Call No.: Pac TK 1005 .P73 2016
Copyright:20-40% of this thesis may be copied without the authors written permission
Abstract: In remote and interior areas of Fiji islands a diesel generator can prove to be the main source of power. However, due to an increase in the price of diesel, generating electricity from renewable sources can be a better option. Since Fiji is an island nation and sits in the trade wind belt, an almost continuous supply of wind resource available in most parts of the country this can be considered an alternating power generating source. However, it would be wise to incorporate a diesel generator as part of the hybrid system for supplying of power in cases of interruptible supply due to irregular supply of wind. To assess wind energy potential, annual wind data for the year 2012 and 2013 at Waisa was recorded through survey work. The average monthly recorded value of the wind speed varied from 3.4 ms-1 to 7.8 ms-1 whereas the annual average was found to be 5.43 ms-1 at 20 m a.g.l. This study presents a technical assessment of wind power potential for Waisa using statistical analysis packages to determine the wind characteristics based on the measured wind data. The micro grid proposed for this study comprises a wind turbine generator system as the renewable energy source, a battery to store the charge and a diesel generator as a backup power supply when the wind resource is not adequate to meet the demand. The annual energy production using a 7.5 kW wind turbine was estimated at 22,860 kWh at the height of 20 m a.g.l. The economic analysis estimated a positive NPV with a BCR greater than one. The payback period is 15 years with internal rate of return estimated at 11.5 %. The levelised cost of energy is determined as $0.106/kWh. At a fixed real rate of discount the payback period is most sensitive to perturbation in any economic indicator. The turbine efficiency and the estimated return on the investment for the proposed configuration show considerable promise.