HVDC (High Voltage Direct Current) New Feeding Method for ...ze.bot.free.fr/GDCF_B05_NTT.pdf ·...

HVDC (High Voltage Direct Current)

New Feeding Method for High Efficiency Data Centre

Copyright © 2011 NTT DATA INTELLILINK CORP.

APEC at Yokohama JAPAN （Nov. 2010）One of the Action list supporting the APEC leaders’ strategic growth is,

・Promote energy conservation activities through the introduction of more energy efficient ICT devices and systems, including data centres and ICT utilization in

manysectors and new ICT services such as cloud computing (Green ICT).

Recently, the situation at the data centre has widely changed.

•Support for environmental protection

• Initiatives to Green ICT

•Correspondence to ICT technology with fast advancement.

To achieve the Green data centre.

•Air-conditioning efficiency improvement

•Server consolidation by virtualization

•High Voltage Direct Current ( HVDC )

Background


It is possible to achieve it by HVDC.

1. Energy-saving design 3. Safety design

The electric shock,

an earth fault,

and the arc problem

are cleared.

2. High-reliability design

UPS is unnecessary.

The system down

is prevented

by the n+1 composition.

Ｐower Supply Rack（ small-sized ！ From 1/5 to 1/10 compared to UPS. ！）

Server Racks

Comprehensive efficiency ２０~３５％ improvement!

Naturally, the electricity bill

of operating is reduced

and The CO2 emissions

significantly reduced!


ACDCAC

Switching board

UPS IT equip.（Server, etc.）

DCAC CPU

CPUDCAC DC

ＵＰＳＩＣＴ

ＩＣＴＨＶＤＣ

HVDC PS Rack IT equip.（Server, etc.）

DC340V

AC DC12V

DC12V

AC

Alternating current

DC

Direct current

AC incoming

AC incoming

Two conversions are eliminated.

Significant energy saving.

Further improved reliability.

UPS system (current)

HVDC

１．Energy-saving design － Efficiency comparison －


4

※ Efficiency calculation is the reference on 50% load.

※ Value about the efficiency varies depending on the configuration.

AC/DC

Server RackPDU （AC）UPS system (current)

75~85%

UPS

98% 80~85% 98.5%

Transformer S/BACAC

Server

～

58～70％

DCｄｃ

DC/DCCentralized power.

PDU （DC）

Co

mp

ensatin

g circuit

of B

us fo

r stabilizin

g

HVDC

98%95%

98%P S

RackDC340VAC

w/o power supply

Server

DC12V～

Approx.９１％

Transformer

Server Rack

HVDC 12V systems is

２０～３５％power reduction.

※The air conditioning

power reduction also added!

１．Energy-saving design － Efficiency comparison －


DC/DC２kW

Central Power Supply（ｎ＋１）

DC/DC２kW

DC/DC２kW

Server Rack ４kW

DCDistribution

boardRectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

ＨＶＤＣ

Power Supply Rack

ｎ＋2

Non-stop system

Transformer

Transformer

Commercial

power supply A

Commercial

power supply BTransformer

ｎ＋１

ＤＣ server

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Rectifier２０kVA

Trouble

DC340VDC12V

SpareSpare

The Spare always

backs up with n+1.

System does not down

even the failure of

multiple locations!

Spare

It is possible to be extended without stopping the system！ｎ＋１ｎ＋１

(Spare) (Spare)

AC incoming

ＤＣ server

ＤＣ server

ＤＣ server

ＤＣ server

２． High-reliability design －ｎ＋1 The merit of redundancy －

Trouble

Trouble


３． Safety design

We achieved "Safety" by our new technology , HVDC！

① ARC Restraint Technology

・By setting the arc control circuit,

suppress the generation of the arc.

②Middle point groundAnti-electric shock ・ earth measure

Arc outbreak at the time of the direct current

interception had been a problem.

Danger associated with the high voltage

had been pointed out.

・An electric shock, an earth fault with high voltage are

limited on a secure current value by the high resistivity of

47kΩ.


◆ When getting an electric shock, the current that flows to " a human is 2( kΩ ) of resistance ".

I3 = = 7.5 mA380V x 47kΩ

47kΩ×(47kΩ+2kΩ)+47kΩ×2kΩ

EE

R2R2

R1R1

R3R3 I3I3

EE

R2R2

R1R1

R3R3 I3I3

I3 ＝R1×(R2＋R3 )＋R2 ×R3

E×R2

Calculating formula

Leakage (electrical shock)

at equivalent circuit.

Middle point ground

When the leakage( electric shock ) detected, turn off the switch and interrupting the route of leakage, and the electric shock is instantaneously stopped.

rectification

R2

47kΩ

0V

+170V

-170V

Ser

ver

･･･

R1

47kΩ

I 3

Human

R3:2kΩ

E340V

There is no influence on the system feeding power by the leakage (electric shock) and the earth fault.

◆ We developed high-resistance grounding method aimed at high-voltage electric shock accident prevention.

※In an actual device, short time peak current flows by the load.

However, we solved in discharge circuit.

Electric shock and earth fault protection

－ Middle point ground －

Ser

ver


ＨＶＤＣ－ Basic system configuration －

SERVER RACKPS RACKAC

DC340V

ΔＹ transformers

Battery

Server

During a power outage.

DC/DC

340V→48V

six-phase full wave rectification

DC340V

Phase shift

３０°

Y結線３相交流

Δ結線３相交流

Battery voltage DC288V

Server

Server

Server

Server

Server

DC/DC

340V→12V

.

Three-phase

Delta Connection

Three-phase

Star Connection


ＨＶＤＣ－ Floor Configuration －

Conventional AC ・UPS systems HVDC systems

※構成例

サーバー室サーバー室

特高受電

非常用エンジン

高圧

トランス

電力室電力室

サーバラック

サーバラック

空調空調空調空調


サーバラック

サーバラック

サーバラック

PS

ラック

バッテリー

空調

空調


特高受電


高圧

トランス

電力室電力室

サーバラック

サーバラック



サーバラック

サーバラック

サーバラック

PS

ラック

バッテリー

空調

空調


特高受電


高圧

トランス

PS

電力室電力室

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー



PS

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー


特高受電


高圧

トランス

PS

電力室電力室

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー



PS

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー

PS

サーバラック

バッテリー

バッテリー


特高受電


高圧

トランス

UPS UPS UPS

バッテリー

各種SW

PDU

PDU

PDU

PDU

PDU

PDU

PDU

PDU

サーバラック

サーバラック

電力室電力室

サーバラック

サーバラック



空調空調

空調空調


特高受電


高圧

トランス

UPS UPS UPS

バッテリー

各種SW

PDU

PDU

PDU

PDU

PDU

PDU

PDU

PDU

サーバラック

サーバラック

電力室電力室

サーバラック

サーバラック



空調空調

空調空調

Floor layout １ Floor layout ２

Server room Server room Server room

Sp

ecia

l-h

igh p

ow

er

re

ce

ivin

g

A/C A/C A/C A/CA/C A/C A/C A/C A/C A/C A/C A/C

A/C A/C A/C A/C

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Se

rve

r ra

ck

Serv

er

rack

Serv

er

rack

Serv

er

rack

Serv

er

rack

Serv

er

rack

A/C A/C A/C A/CA/C A/C A/C A/C A/C A/C A/C A/C

A/C A/C A/C

A/C A/C A/C A/C

A/C

A/C

A/CA/C

A/CA/C

Battery Battery

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

Ba

tte

ry

GeneratorGenerator Generator

High-voltage

transformers

High-voltage

transformers

High-voltage

transformers

S.BPS

Rack

Sp

ecia

l-h

igh p

ow

er

re

ce

ivin

g

Sp

ecia

l-h

igh p

ow

er

re

ce

ivin

g

Electrical room Electrical room Electrical room



Major data center company A This company constructs the data center of 4000 racks scale in the autumn of

this year.

Major data center company B This company is examining the introduction at the beginning of next year .

Major carrier C The evaluation machine was introduced.

Result of JAPAN

Suggestions

（AC）Battery

AC/DC DC/AC

AC/DC

The photovoltaic generation Installation.

Rectification

Power controller

photovoltaic

panel

AC AC

UnnecessaryUnnecessary

（DC）

Server, Router, etc.

Con

ve

rter 12V340V

AC/DC

12V340V

Unnecessary

DC/DCDC/AC

UPS

AC

incoming

DC400V

Non-priority

DC340V

DC200～400V

Efficiency 97%

Priority

HVDC Supply

The output of the photovoltaic panel is a high voltage,

So the HVDC data centre is a good combination !・No power controller

Highly effective, high reliability, and low price !

・As running out of the photovoltaic generation power,

the electric power is automatically supplied from the AC systemside.

・HVDC does not flow back to the AC system in waveform

troubled!

General method of Japan HVDC

HVDC can be used without converting

the power of the photovoltaic generation.

photovoltaic

panel

Co

nve

rte

r

Server, Router, etc.

Battery

MTTP with control operation

DC/DC Converter

[email protected]

Green Consulting Business Unit

Green Consulting Business Division

NTT DATA INTELLILINK CORPORATION

If you have any interest in our products, please feel free to contact the

following address.

Thank you for your attention.


HVDC (High Voltage Direct Current) New Feeding Method for ...ze.bot.free.fr/GDCF_B05_NTT.pdf ·...

Documents

Transcript of HVDC (High Voltage Direct Current) New Feeding Method for ...ze.bot.free.fr/GDCF_B05_NTT.pdf ·...