Abstract:
Mitigation of powerdemand of a remote area of Bangladesh has been studied
here.SwarnaDweep, an island in the Bay of Bengal, is considered for the work.Due to its
geographical location, it is not economically feasible to connect SwrnaDweep with grid
connection. People of this island need to depend on diesel generator which is not
environment friendly. To obtain the environment friendly power, a detail survey is
conducted to assess the renewable resources available in SwarnaDweep and to estimate
the component cost. In the study, optimum configuration of a solar-wind-biogas-dieselbattery hybrid energy system is determined for the uninterrupted power supply system for
the SwarnaDweep using Hybrid Optimization Model for Electric Renewables software
developed by National Renewable Energy Laboratory. Besides that by economic
modeling, the economic viability is tested. Moreover, an effort is taken to validate the
result of HOMER by intelligent system and functional test is conducted on the proposed
hybrid design. Payback period and internal rate of return are calculated and compared
with the hybrid energy systems reported in the literature. A combination of 100 kW PV
array, 25 Wind turbine (10 kW each), a diesel generator with a rated power of 40 kW, 30
kW biomass generator, 2000 piece of storage battery and 650 kW converter is the most
commercially reliable in terms of Cost of Energy (21.655 Tk/kWh), Net Present Cost
(171,171,120 Tk) and initial cost (40,451.200Tk). The proposed hybrid energy system has
the electricity generation mix of 29 % from PV, 56% from the wind turbine, 5% from
diesel generator and 10% from biogas resources. The proposed hybrid system was able to
produce 1957 kWh/day against the 1694 kWh/day required for lighting and power loads.
Considering 25 taka per kilowatt hour, the payback period is only 9 years and considering
30 taka, the payback period is 8 years. After calculation of internal rate of return becomes
9.33% which is beneficial as the interest rate is considered 8% for the project.The
sensitivity analysis is undertaken to assess the effect solar, wind,biogas resource and
diesel costs,on the net present cost and CO2emissions.The results indicate that available
solar, wind and biogas resource can be utilized economically using hybrid energy systems
for decentralized applications in remote areas of Bangladesh.
