IEEE Power & Energy Magazine - May/June 2015 - 49
figure 6. The Onagawa nuclear station in June 2012. The portion of the seawall in lighter green is the new addition to
compensate for subsidence. (Source: Alexis Kwasinski.)
✔ reduced CO2 emissions compared to standard systems.
✔ used various common carrier communication stan-
The Hachinohe project focused on high renewable content
and is notable in that a dual distribution network, as shown
in Figure 2, was constructed to distribute microgrid power
to city offices and schools. It accomplished the following:
✔ controlled power flow at the point of common coupling
with the megagrid, achieving 99.98% of its power flow
within ±3% of target over a 6-min moving average
✔ demonstrated islanded operation, resulting in 100%
compliance with targets for each of frequency (within
±0.5 Hz), voltage (within ±5.94%), negative-phasesequence current (within 2.8 A to mimic a back-up
generator), and higher harmonic wave control (within
5% total harmonic distortion)
✔ reduced energy use and CO2 footprint by 70%, and
conducted a life cycle assessment
✔ studied the trade-off between cost and tie-line power
flow control accuracy.
The Kyoto eco-energy project in Kyotango implemented
a regional power grid demonstration incorporating various
new energy sources. It had a high renewable fraction, notably biogas digested from the remains of local fruit processing, and was also intended to demonstrate coordination
among local generation using a complex multipathway
communications network. By utilizing the existing electrical power system and multiple communications pathways,
the project developed and verified a balancing control system or "virtual microgrid" in a rural area. In addition, it
explored the possibility of supply-demand balancing for
different scales of facilities by virtual microgrid simulation and islanding operation. Its achievements were the
following:
✔ showed successful fluctuation balancing of PVs and
wind generation using biogas-fired gensets and batteries
dards over NTT's services to construct a system providing controlled supply from multiple dispersed resources
✔ monitored and archived operating data for the test
period at 10-s resolution
✔ studied a possible expansion of the system across the
rural Kyotango community
✔ produced a guidebook for similar communities.
may/june 2015
figure 7. There was no damage in the town of Motoyoshi,
which is about 1 km away from the destroyed coastal area.
(Source: Alexis Kwasinski.)
ieee power & energy magazine
49
Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2015
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IEEE Power & Energy Magazine - May/June 2015 - Cover3
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