experience of sendai microgrid and next challenge · 2014-12-10 · sendai microgrid worked very...

Experience of Sendai Microgrid and Next Challenge

November 2014

Keiichi HIROSE

Copyright 2014 NTT FACILITIES,INC. All Rights Reserved.

1Outline

1. The Great East Japan Earthquake and

Sendai Microgrid

2. Our smart community project by DC power

3. Summary


2The Great East Japan Earthquake

The Great East Japan Earthquake

on March 11, 2011


3Advanced Power Supply System against “3.11 disaster”

Source: http://spectrum.ieee.org/energy/the-smarter-grid/a-microgrid-that-wouldnt-quit/0

The TOHOKU region pacific

coast earthquake,

March 11, 2011

SENDAI microgrid

by NTT FACILITIES

Long duration outage area

caused by the disaster.

http://spectrum.ieee.org/energy/the-smarter-grid/a-microgrid-that-wouldnt-quit/0


4SENDAI Microgrid System

Servers

Lightings

Fans

1 mega-watt microgrid system in university campus

PV panels

AC grid power

Gas Gen

Fuel cells

Natural gas

(City gas)Batteries

High quality power supply

for mission critical loads

Renewable energy

(Solar)

PV panels

Fuel cells

Power

converters

& batteries

Gas Gen-sets

Supported by NEDO

FY 2005-08

Power

converte

rs

We constructed micro grid in Sendai city to supply high quality power for

mission critical loads.


5Layout of “Sendai micro-grid”

Area of Sendai city

App. 500 m

Coverage area

Power route

Buildings

Road

legend

Hospital【C-Class Load】

Dormitory / Training Center【Normal Quality】

Connecting Point with Utility Grid

Nursing Care Facilities【B3-Class Load】

High school【B2-Class Load】

Nursing Care Facilities【B1-Class Load】

Dormitory【Normal Quality】

University / Laboratory【A-Class Load】

Control Center【DC Power Load】

Area of high school


6Condition of Supplying Power during March 11

Date

in 2011March 11 March 12 March 13 March 14

Utility Grid

GasG

DC

AC level A

AC level

B1

AC level

B3

PV

The system continued to supply DC, A, B1without any interruptions

for batteries and PV generation system.

GasG supplied power for 43 hours during outage.

Grid Connection

▼14:47:10 Voltage collapse Grid

OutageOutage

▼8:16:43 Grid Recover

Stop Islanding operation

Supply from GasGOutage

Outage

Outage

▼Disconnect ▼About 12:00 GE started. (Islanding operation)

▼About 14:00 Dispatch Start (for customer needs)

▼02:06 Stopped manually

Supply from

BatterySupply from GasG

Battery

Battery

▼02:06 Stopped manually

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Grid Connection

Pow

er q

ualit

y

Supply from GasG

Supply from GasG

Grid Connection


7Disaster Recovery by Microgrids

Load Load Load

Grid independent systems are greatly needed!

Cloud

Mega-solar

Grid dependent (<10 MW)

Thermal/nuclear/hydropower plants

Utility grid (Bulk)

http://www.iconfinder.com/icondetails/29216/128/cloud_popcorn_weather_icon

http://www.iconfinder.com/icondetails/29216/128/cloud_popcorn_weather_icon


8Outline

1. After the Great East Japan Earthquake


3. Summary


9New project supported by the MOE*, Japan

DCCluster

DCCluster

Utility grid

Energy exchanging among clustersHigh efficient DC power system for office buildings

Cluster : minimum scale of micro-grid

ACClusterDC

Cluster

EV

Purpose The verification test to realize the distributed autonomous system by the direct-current system which utilized renewable energy

Obihiro site Yamagata site

*Ministry of the Environment


10Demonstration sites

Obihiro city,Hokkaido

Obihiro site

High efficient DC power system

for office buildings

Yamagata city

Obihiro Sanitation Center

Yamagata Technical high School

Yamagata site

Energy exchanging among clusters


11Smart community project by DC power at Obihiro site

～LED LED

EV

Laptop

Storage battery

DC380 V

EMS

SW

adapter

SWRectifier

DC PCS

A

(A)High efficient converters• Rectifier

• DC PCS

• EV bi-directional charger

(B)DC power feeding system

and its components for office• DC wiring method

• DC adapter for laptop PC

• DC switches

(C)DC power Energy Management System

Development of high efficient DC powering systemfor office buildings

A

C

B B

B

PV

A

Study items


12Smart community project by DC power at Yamagata site

(A)Grid topology

(B)Equipment for power exchange (Power exchanger)

(C)Algorithm

(D)Management

Development of energy exchanging system among clusters.

cluster

cluster

clusterA

EMSD

C

Study items

exchanger

B

exchanger

Bexchanger

B

C

exchange

C


13Future vision

FY2012 FY2013 FY2014 Target

Obihiro

site

Reduction in

50 % CO2

emissions

Yamagata

site

A 40%

reduction in

storage battery

capacities

development of equipment

construction

grand design

development of equipment

construction

grand design

demonstration

demonstration

now

Communitycluster

cluster

cluster

cluster


14Outline

1. After the Great East Japan Earthquake


3. Summary


15Summary

Sendai Microgrid worked very well during the great east Japan

earthquake. After the major event, the renewable energy and

distributed power system were focused more and NTT-F have

developed and demonstrated new microgrid systems.

One of new distributed power systems includes the mutual

energy exchanging system between (smaller scale) microgrids

called “cluster”. Use of DC power is also focused.

The smart community project is demonstrated in Obihiro and

Yamagata for the purpose of the development of high-efficient

system and the verification test to realize the mutual energy

exchanging system between micro-grids using DC power.

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

International cooperation for DC power standardsThank you for your attention.

experience of sendai microgrid and next challenge · 2014-12-10 · sendai microgrid worked very...

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