Panel on DC Power for Buildings

Keiichi Hirose, Ph.D.NTT Facilities, INC. Japan

IEEE EnergyTech ConferenceThe Case Western Reserve University,

Cleveland, Ohio

May 31, 2012

2005-2008NEDO Sendai Microgrid Demo

2007 Dec.DC Microgrid Demo With 380 VDC servers

2009100 kW, 380 VDCDemos in Tokyo

2008 JuneNTT News release“Use of DC power forData centers in NTT”

2006 JuneJANOG Paneldiscussion

Note :JANOG: Japan Network Operators Group

2011 Feb.Commercial ServiceWith 380 VDC

History of 380VDC power promotion for data centers2

Step2Field demonstration

Step2Field demonstration

Step1Research & development

Step1Research & development

Step3Commercial services

Step3Commercial services

DC Power Demonstrations by NTT Facilities

Tokyo Metropolitan 100 KW x 5 sites

Sapporo

SendaiNEDO Project300VDC Demo

Osaka

Fukuoka

NTT Musashino　lab.

NTT FacilitiesNTT Data Corp.

Aichi380VDC Microgird

In university campus

NTT EAST *

* : The demonstration was supported by Ministry of Internal

Affairs and Communications, Japan in 2010.

NTT Atsugi lab.

3

Module data center in wind farm

Next step for advanced DC power system

Electric appliancesElectric appliancesDistributed Energy SourcesDistributed Energy Sources

DCDCpowerpower

TelecommunicationsTelecommunications

ComputerComputer(Information)(Information)

Fusion, since 2000

Next step

Central offices

Data centers

Residential, commercial buildings

Smart community project by DC power distribution for commercial and residential buildings

Obihiro city,Obihiro city,HokkaidoHokkaido

Yamagata cityYamagata city

This project is supported by the Ministry of Environment, Japan.

TokyoTokyo

New Project FY2012-2015New Project FY2012-2015

Purpose of the project

• Distributed autonomous system with DC power integration

• Development of– High-efficient energy system– Energy interchange system– Disaster prevention function(s)– Business model

• Demonstraion in 2 sites (Yamagata, Obihiro)• Feasebility study

Energy center

Residential zone(4 houses)

Office building zone

Power node

Commercial building zone

Commercial building zone

PV panels

Demonstration area in Yamagata cityDemonstration area in Yamagata city(Draft)(Draft)