Applied inverter for this design is bidirectional
inverter because of the connection of on grid and off
grid mode.
For the placement of PV panel on the roof,
needed space on the roof is 700 m
2
or around 54% of
the total wide of the rooftop buildings. This is
available because of the total rooftop area is 1310
m
2
. However, the weight of the installed panels
should be seriously considered because of the
structural elements of building. For this design, the
weight of the panels will be 7.434 kg, so it is heavy
enough for the existing buildings which are not
constructed for PV panels on the roof.
To keep the continuity of electric supply if the
PLN utility supply is collapse or the energy from the
solar panel and battery are not enough to supply the
loads, diesel generator is set to back up the system.
Output of the diesel generator for these buildings is
80 kVA. Specification of the diesel generator can be
seen in Table 2.
Table 2: Diesel generator specification
4 CONCLUSIONS
Rooftop photovoltaic system for microgrid design
is presented in this paper and the results can be
concluded as this system for daily energy demand
380 kWh of 3 phase connected system in Electrical
Engineering Department, Campus 2, State
Polytechnic of Ujung Pandang needs 360 PV panels
to supply the loads. The power capacity of the PV
panels is 108 kWp with installed battery capacity
10.000 Ah. Roof space needs 54% of the total
existing roofs for installed PV panels. To keep the
continuity power supply, diesel generator with 80
kVA capacity is set to back up the system.
Campus as a role model to develop microgrid
system to response the government policy of applied
renewable energy sources as an environmentally
impact consideration to reduce the thermal power
generation. Microgrid system design in campus is
very important as the basic knowledge to develop
microgrid system.
To explore the potential of renewable energy in
this location, future research will be developed a
microgrid system with considering wind turbine as a
hybrid power generation. Wind speed in this
location is considerable to harvest electrical energy.
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