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dc Superconducting Power Transmission Line in Chubu University. Presented by S. Yamaguchi [email protected] Contents Introduction of HTS Power cable Present status of ac power cable system DC Power Transmission System Proposal of dc superconducting power transmission system.

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Dc superconducting power transmission line in chubu university

dc Superconducting Power Transmission Linein Chubu University

Presented by S. Yamaguchi

[email protected]


Contents

Introduction of HTS Power cable

Present status of ac power cable system

DC Power Transmission System

Proposal of dc superconducting power transmission system


Start of ac power transmission

Start of ac Power Transmission

Started by Sumitomo in Japan

Replace of Copper cable

High current density of HTS cable

Low Cost of civil engineering

Good for Metropolitan Area, like New York & Tokyo


Present system of ac power transmission

Present System of ac Power Transmission

superconducting ac cable


Goal of ac power transmission

Goal of ac Power Transmission

normalized loss

Low Loss Cable

Main loss is due to

AC losses!

Power is consumed by Cryo-cooler

goal

copper cable

HTS cable

4 times Higher

@present time

From memo of Sumitomo in 1990’s


Ac power transmission projects

ac Power Transmission Projects

From memo of Sumitomo


Nedo 500m cable project

NEDO 500m Cable Project

2001

2005

Fiscal Year

Project is terminated March, 2005!


Present cable projects in the world

Present Cable Projects in the World

US several projects in NY and Long Island

Korea KEPRI, now installing by Sumitomo

China InnoST & Universities

These are all ac cable projects!


Present summary of ac hts cables

Present Summary of ac HTS Cables

Reduce ac Losses ~ 1/4 is required

Reduce the Cost ~ 1/10 is required

Reduce heat leak ~ 1/3 is required

Reduce Pressure Drop

How to re-start the National Project in Japan!

Review and Check Basic Ideas


Proposal of dc sc transmission line

Proposal of dc SC transmission line

y0: Initial cost of ac Cu cable system

y1: Initial cost of dc Cu cable system

High Inverter Cost

x0 ~ 300 km for present system

y2: Initial cost of dc SC cable system

Inverter, Cryo-cooler Costs

for long distance,

ac Cu cable < dc Cu cable < dc SC Cable


dc Power Transmission in World

Gotland

98km 260MW

Quebec-NewEngland

1486km 2250MW

Nelsonriver 240km 500MW

Vancouver

Ekibasutsuusu-centa 2400km 6000MW

Vienna 600MW

Ninamifukumitsu 300MW

Inter-mountain 785km 1920MW

Shyanghai 1046km 1200MW

Pacific intertie 1361km 1100MW

Crosschannel 70km 1000MW

Ultra high Voltage system

Long distance system

Many system in all over the world

Newzealand 617km 1240MW

総合電気雑誌 OHM 1999 / 1 p.45 図1より引用


Development of Electric Power

US - GRID2030

300GW until 2020

dc transmission for long distance

China

150GW is underconstruction now.

18GW/year until 2020


dc transmission system

Merit & demerit

Advantage for long distance

High utilization factor

Available for different frequency

High cost by Inverter


Low cost Inverter(1)

Development of low cost inverter -

Application of Hybrid car’s Inverter

Battery- dc

Motor -ac

in Toyota Prius

VVVF inverter

Low Cost !

Less than 1/10


Low Cost Inverter(2)

Inverters of Electric Vehicle and Power Cables

dc power transmission: High Voltage/series connection

EV : Low Voltage / series and parallel connection

High switching freq. ⇨ low higher harmonics

           ⇨ high efficiency & low loss

⇨ hard serial connection


Low Cost Inverter(3)

Inverter for SC Cable & connection

  • Thyrister is used for power transmission line, and its voltage and current are ~ 4 kV and ~3 kA

  • IGBT is used for EV, and its voltage and current are 1.7 kV and ~ 100 A

  • Ic of Bi-2223 tape is ~100A in the present time

  • Insulated and individual connection of the tape and the inverter is better to avoid the current imbalance and for the control and monitor.

EV’s inverter is better for the parallel connection of Inverter and HTS Tape,

But higher voltage is better now.


Dc copper cable
dc Copper cable

Honshu-Hokkaido Power Cable, Japan

Ultra High Voltage: ±250kV

Relative Low current: 1kA

Single Phase cable

Oil Cooling Cable

Structure is similar to SC cable!


Subjects of dc sc cable system
Subjects of dc SC cable system

Keep low temperature for long distance

High Thermal Insulation

Low Pressure Drop

&

Low Cost Cable !

No ac Losses!

High current density is achieved!


Criticism of sumitomo s sc cable
Criticism of Sumitomo’s SC cable

Electric Insulation isolate the SC from coolant

Low Thermal Insulation

High Pressure Drop


Criticism of furukawa s sc cable
Criticism of Furukawa’s SC cable

No transport current in shield layer (high cost)

Low Thermal Insulation

High Pressure Drop

Hard to reduce the cost!


Our design of sc cable
Our design of SC cable

No Shield Layer (low cost)

High Thermal Insulation (electric and thermal insulator)

Lowest Pressure Drop (Gas and oil pipe line structure)


Connections of current lead hts tape and inverter
Connections of Current Lead, HTS tape and Inverter

Management of Cable System

Contorl of Strand Current(Insulated HTS tape)

Small inverter connects insulated strand

Monitor the individual voltage of Strand


Connection of dc sc cable system
Connection of dc SC cable system

dc Single Phase connection for SC cable

and Low Cost!


Dc sc cable connection
dc SC cable connection

Management of Cable System

Contorl of Strand Current(Insulated HTS tape)

Small inverter connects insulated strand

Monitor the individual voltage of Strand


Electric power storage
Electric Power Storage

Power Grid can Store Electric Power!

High current for Superconducting cable

high current and high inductance is better to

store the electric power


Low cost smes pipe line
Low Cost & SMES Pipe Line

Iron Core Pipe

Magnetic Shield

High Inductance

Low Cost

High Mechanical Strength

Storage Energy ~ 230MJ for 20kA, 100km


PCL application

High Current, but High heat Leak

Peltier Current Lead

Heat leak for 77K unit(mW/A)

We plan not to use liquid N2 to reduce the heat leak

at current lead.


Reality of dc sc cable system
Reality of dc SC cable system

  • Many dc Power Transmission Projects and Plan in US, China, Russia and Middle East

  • Low cost Inverter is developed in Japan

  • Enough high current density for Bi-2223 tape conductor

  • Need to develop cable cooling for long distance

  • Electric Power Storage function


Present experimental plan
Present Experimental Plan

Length < 15 -20 m

Current > 2 - 4 kA

40 HTS Tapes of Sumitomo

Ic > 130 A @ 77K

Voltage > 10 - 30 kV

Temp. < 77K

(sub-cool N2 & slush N2)

From 2005.4 to 2010.3

Layout in the experimental room


Present collaborations goal
Present Collaborations & Goal

Japanese several Universities

materials, design, basic test & experiment

calculation

Two Private Companies in Japan

Cryo-cooler system, cryostat for cable

goal

Re-start the National Project in Japan


Back to Edison !

Use dc power !

Realize a Realistic SC System

through

Collaboration from all over the world!


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