IEEE Power & Energy Magazine - May/June 2015 - 54
The Kyoto eco-energy project in Kyotango implemented a
regional power grid demonstration incorporating various new
energy sources.
The campus trains caregivers, especially for geriatric care,
and has both a senior residence home and a hospital.
The energy center shown in Figure 12 was installed and
techniques for practical local HeQ systems developed. The
demonstration
✔ clarified that the system could reduce costs by 14-30%,
reduce equipment footprint by 23-42%, and equal or
lessen electrical losses compared to the existing system
✔ installed a 300-Vdc server in addition to the existing
48-Vdc equipment and verified the efficiency characteristics of dc power supply
✔ demonstrated a semiconductor circuit protective device
effective at maintaining the highest power quality level
for the dc circuits
✔ imposed power failure events on the system using a
back-to-back (BTB) voltage dip generator, and tested
the performance of the system (the BTB generator
allows simulation of many power failure events that
could occur in utility grids and verifies all power qualities can be simultaneously provided)
✔ established a testing method for simulating natural
phenomena affecting utility grids
✔ developed techniques for integrated power supply
enabling stable conditions for the genset islanding
mode supplying active and reactive ac power
✔ established a simulation model for the system confirming similar availability with an existing UPS system using Monte Carlo simulation.
The SM was the only one of the four NEDO demonstrations to continue beyond the 2008 end of the program. CHP
was added to the campus, rectifying one of the key limitations of the NEDO program design, and the city buildings
were dropped. These changes were sufficient for the university to find it economical to continue operation, and it was
still functioning in this mode at the time of the GEJE.
SM Resilience Performance
Sendai was severely affected by the GEJE but was well prepared for earthquakes in many ways. Particularly, it has a
hardened natural gas supply infrastructure, which enabled
for importing natural gas from Niigata Prefecture. Together
with its good initial design, the skill and improvisation of onsite technicians enabled the SM to perform excellently during GEJE's aftermath. This seminal experience is described
in more detail below, but it spoke loudly for the advantages
of robust localized power systems, and microgrids in general. When the earthquake occurred, ToPo stopped supplying
power to the area surrounding the SM, resulting in an almost
three-day outage. Nevertheless, the SM was able to continuously supply power to some small critical loads within the
campus and provided full heat and power service for almost
two and a half of the three black days.
The microgrid operations timeline is presented in
Figure 13. Following the GEJE, megagrid service was
lost for almost three days. The various qualities of service
were provided for differently, which is the strength of this
F
A
G
B
E
D
C
A: Photovoltaic Panels 50 kWp
B: Gas Engine Gen-Set
350 kW X2
C: Molten Carbonate Fuel Cells
250 kW
D: Dynamic Voltage Restorer 1
600 kVA
E: Dynamic Voltage Restorer 2
200 kVA
F: Building 1
Integrated Power Supply
G: Building 2
Back-to-Back
Voltage-Source Converters
(For Test Equipment)
figure 12. The Energy Center at the SM. (Source: NTT Facilities.)
54
ieee power & energy magazine
may/june 2015
Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2015
IEEE Power & Energy Magazine - May/June 2015 - Cover1
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IEEE Power & Energy Magazine - May/June 2015 - Cover3
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