IEEE Electrification Magazine - September 2015 - 7

Figure 6. The RinKu-Tokoname site of the Aichi subproject.

PV systems was 330 kW, including three
cell types as multicrystalline silicon,
amorphous silicon, and a single crystalline silicon bifacial type. Also, a 500-kW
NaS battery for storage was used to balance the supply and demand of the
microgrid operation. Figure 6 is the
photo of the second demonstration site
near Chubu International Airport.
In Kyotango, Japan, the subproject
was not an actual microgrid. Because
energy supply facilities and the
demand sites of this project were connected on a utility grid, these operated
as similar to a fully deregulated system.
The power generation equipment and
end-user demands were monitored
and controlled by a remote EMSs.
The main energy resource was a
biogas plant. In the plant, the main
resources were four gas engines with
a total capacity of 400 kW and one
250-kW MCFC. Also, a 100-kW lead-
acid battery was installed to manage
power quality and balancing. In
remote locations, two PV systems and
one 50-kW small wind turbine were
installed as the disturbance element
of balancing this microgrid system.
The Hachinohe Project, known as a
very unique microgrid, installed a private distribution line of more than
5 km in the center of city of Hachinohe, Japan. The private distribution line
transmitted electricity, primarily generated by the gas-engine system in the
sewage plant, to the city office building. Between the sewage plant and
city office, four schools and a water

Figure 7. The main facilities of the microgrid at the sewage plant in
Hachinohe.

supply authority office were connected to the private distribution line.
In the sewage plant, three 170-kW
gas engines and a 100-kW PV system
were installed (Figure 7). One 50 kW of
inverter for the PV system could compensate imbalance of demand among
three phases. This function was needed when this microgrid was operated
independently from the utility grid to
avoid the trouble of engine generators. A wood-waste steam boiler was
installed because of a shortage of
thermal heat to safeguard the bacteria
in the gas chamber.
At the school sites, renewable energy resources were installed to create

fluctuated power injection on the
microgrid to demonstrate the smooth
balancing capabilities of a welldeveloped EMSs of microgrid.
One new concept for microgrids is
adding extra value other than balancing
them, such as a resilience microgrid. In
the demonstrative project on power
supply systems by service level, this
kind of extra value was demonstrated in
Sendai City. In this microgrid, two
350-kW gas engine generators, one
250-kW MCFC, and various types of
compensating equipment were installed beside university buildings
(Figure 8). One piece of equipment installed was an integrated power quality

High-Quality Power Supply Equipment
BTB Voltage Management Equipment
Series Compensator
PV

Gas Engine
Molten Carbonate Fuel Cell (MCFC)

Figure 8. An example of the compensating equipment and generators in the Sendai project.
	

IEEE Elec trific ation Magazine / S EP T EM BE R 2 0 1 5

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2015

IEEE Electrification Magazine - September 2015 - Cover1
IEEE Electrification Magazine - September 2015 - Cover2
IEEE Electrification Magazine - September 2015 - 1
IEEE Electrification Magazine - September 2015 - 2
IEEE Electrification Magazine - September 2015 - 3
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IEEE Electrification Magazine - September 2015 - Cover3
IEEE Electrification Magazine - September 2015 - Cover4
http://www.nxtbook.com/nxtbooks/pes/electrification_december2019
http://www.nxtbook.com/nxtbooks/pes/electrification_september2019
http://www.nxtbook.com/nxtbooks/pes/electrification_june2019
http://www.nxtbook.com/nxtbooks/pes/electrification_march2019
http://www.nxtbook.com/nxtbooks/pes/electrification_december2018
http://www.nxtbook.com/nxtbooks/pes/electrification_september2018
http://www.nxtbook.com/nxtbooks/pes/electrification_june2018
http://www.nxtbook.com/nxtbooks/pes/electrification_december2017
http://www.nxtbook.com/nxtbooks/pes/electrification_september2017
http://www.nxtbook.com/nxtbooks/pes/electrification_march2018
http://www.nxtbook.com/nxtbooks/pes/electrification_june2017
http://www.nxtbook.com/nxtbooks/pes/electrification_march2017
http://www.nxtbook.com/nxtbooks/pes/electrification_june2016
http://www.nxtbook.com/nxtbooks/pes/electrification_december2016
http://www.nxtbook.com/nxtbooks/pes/electrification_september2016
http://www.nxtbook.com/nxtbooks/pes/electrification_december2015
http://www.nxtbook.com/nxtbooks/pes/electrification_march2016
http://www.nxtbook.com/nxtbooks/pes/electrification_march2015
http://www.nxtbook.com/nxtbooks/pes/electrification_june2015
http://www.nxtbook.com/nxtbooks/pes/electrification_september2015
http://www.nxtbook.com/nxtbooks/pes/electrification_march2014
http://www.nxtbook.com/nxtbooks/pes/electrification_june2014
http://www.nxtbook.com/nxtbooks/pes/electrification_september2014
http://www.nxtbook.com/nxtbooks/pes/electrification_december2014
http://www.nxtbook.com/nxtbooks/pes/electrification_december2013
http://www.nxtbook.com/nxtbooks/pes/electrification_september2013
http://www.nxtbookMEDIA.com