3.1 Optimization Result:
HOMER did a total of 143,352 simulations and among them 126,288 were
feasible. Among them the most feasible and cost effective five
simulation results have been summarized in Table 10 . Here in
this table the system optimization results have been shown that has been
simulated by homer and has been ranked on the basis of COE and NPC.
From the result in Table 10 , it is seen that on the first
choice wind turbine is not included. So it can be determined that for
the location for the considered amount of load wind turbine is not
economical.
The most feasible, optimized and economical combination for the site
from the simulation is found to be a solar PV-battery-diesel generator
hybrid system that has a NPC of USD 6,191 and a COE of 0.125 $/ kWh.
Here the percentage of renewable energy to the overall generation is
82.5%. In this combination the total amount of diesel used by the
generator in a year will be approx. 220 Liters. Here the solar PV
supplies 3 kW and generator has 0.670 kW supply. We have 12 batteries in
this system.
The second combination on the result table has wind-PV-battery-diesel
generator all the three sources present. Here wind turbine is included
so the NPC has become higher from the previous one. But this model has
reduced amount of fuel used. This combination has a NPC of USD 10,696
and a COE of 0.216 $/ kWh. Here the percentage of renewable energy to
the overall generation is 88.7%. In this combination the total amount
of diesel used by the generator in a year will be reduced to approx. 143
Liters.
We have got higher NPC for diesel only system that is USD 19,038 and a
huge amount of fuel usage of 1,235 L/year. The COE is also higher here
and is about $.386/ kWh. Here renewable energy fraction is 0%.
Then the next model has only generator-battery based system. It has a
NPC of USD 19,238. Here COE is $0.390/ kWh. The renewable energy
fraction here is 0.0345%. The last combination we got is
wind-generator-battery system has a total NPC of USD 19,997. Here COE is
higher and is $.405 /kWh. The fraction for renewable energy here is
26.2%.