IEEE Electrification Magazine - September 2015 - 9
back-up system that supplies noninterrupted high-quality power. For the different power quality requirements, capacitor-based compensating equipment
was available to compensate short-term
interruptions and voltage drops. For the
demonstration, new back-to-back (BTB)
equipment was added to create an artificial voltage drop to test the function of
the compensating equipment in this
microgrid system.
This demonstration system was
transferred to the university that
had been an entrusted entity of the
NEDO project. After the transfer, on
11 March 2011, an earthquake hit the
northern part of Japan. Sendai City
was one of the most damaged cities
in this earthquake. As a result of this
earthquake, the northern part of
Japan experienced almost three days
without power. During this outage,
this microgrid system could operate
and supply electricity to the hospital,
as shown in Figure 9.
International Projects
In 2010, NEDO started international
smart grid-related working on
international projects. The first project
was the Japan-U.S. collaboration
project in 2010. Before starting this
project, NEDO called for proposals
from the industrial sector. Finally,
19 entrusted companies were selected
at the start of the project in March
2009. After the open call for participants,
the project was designed in early 2009.
Through the discussion and design of
the project, NEDO decided to install
the demonstration systems on two
sites in New Mexico, Los Alamos
(Figure 10) and Albuquerque.
At the Los Alamos demonstration
site, NEDO constructed a distribution
feeder-level microgrid demonstration
system and one demonstration
smart house.
NEDO installed 1-MW PV generation
system (Figure 11) and 1.8-MW battery
system with a 1 MW sodium-sulfur
battery (Figure 12) and 0.8-MW lead-
acid battery on the demonstration feeder. A feeder-level EMSs (micro-EMSs)
operates energy balance to absorb fluctuation of generated electricity from PV
generation by controlling the charge
and discharge of battery systems. Moreover, using the balancing capability of
micro-EMSs (Figure 13), it becomes possible perform energy trades with the
market by considering the price change
in wholesale market.
Involving customers on the demonstration system feeder, demand response
was demonstrated for the last two
years. In this demonstration, 900 residential customers participated. We
divided those customers as one control
group and three treatment groups.
The smart house site in Los Alamos
(Figure 14) had three different home
EMS (HEMSs) (Figure 15). Those HEMSs
were designed to automatically schedule and control demand of household
appliances and distributed energy
Figure 11. A 1-MW solar system.
Figure 13. The micro-EMS.
Figure 12. A 1-MW NaS battery.
Figure 14. The smart house.
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
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