Application of Large- Capacity Transmission...

1 State Grid Corporation Of China. All rights reserved.@2013

Application of Large-

Capacity Transmission

Techniques

Wang yimin State Grid Corporation of China

Washington DC

May 30, 2013


1. Overview of UHV AC & DC Transmission projects

Project Construction

Time

Operation

Time

Jindongnan-Nanyang-Jingmen 12/2006 01/2009

Huian-Shanghai 10/2011 12/2013

Zhebei-Fuzhou 04/2013 03/2015

Yunnan-Guangdong 12/2006 06/2010

Xiangjiaba-Shanghai 12/2007 07/2010

Jinping-Sunan 12/2009 12/2012

Hami-Zhengzhou 05/2012 09/2014

Xiluodu-Zhexi 07/2012 12/2014

Hami

Zhengzhou

Jindongnan

Nanyang

Jingmen Jinping

Xiangjiaba

Xiluodu

Huinan Shanghai

Zhebei

Fuzhou

Sunan

Shanghai

Zhexi

8000MW/2210km

7200MW/2059km 6400MW/1907km

8000MW/1680km

2*3000MVA

640km

2×3000MVA

2×656km

2×3000MVA

2×603km

Legend

1000kV AC，Commercial operation

1000kV AC，Under construction

±800kV DC，Commercial operation

±800kV DC， Under construction

5000MW/1373km Yunnan

Guangdong


Why choose AC 1000kV ?

Based on economical analysis and other methods, 1000kV is more economical than

500kV when the transmission capacity is more than 4000MW and transmission

distance is longer than 500km

2. Application

500kV 1000kV


DC Transmission Selection

The critical economical transmission distances are determined using the unit

capacity annual cost method

2. Application

±1100

±800

±500

kV

4500km 800 2300

Capacity ：8000MW

Current ：5000A

Conductor Cross Section ：6×1000

Power Loss rate ：3.1%～5.5%

Capacity ：10000MW

Current ：5000A



Capacity：3500MW

Current：3500A

Conductor Cross Section：4×1000

Power Loss rate： <3.6%

±660

Capacity ：4600MW

Current ：3500A



1100

Economical Transmission Distance and Line Loss for the four voltages


AC or DC ? who applicable ?

AC or DC are determined considering the different transmission characteristics

and the impact factors such as economic, security, reliability, environmental etc

2. Application

AC

500kV

AC

1000kV

DC

± 1100kV

DC

± 800kV

DC

± 500kV

Tra

nsm

issi

on C

apac

ity（MW

）

Transmission Distance（km）

400 800 1200 1600 2000 2400 2800 32003000

4000

5000

6000

7000

8000

9000

10000

3600 40000

DC

±660kV


Southern

power grid

Northwest

power grid

Northeast

power grid

Legend 1000kV AC

Back to back

DC

±800kV DC

±660kV DC

±500kV DC

±400kV DC

Tibet power

grid

3. Development goal

Increase capacity

Raise the DC current up

to 6250A and the voltage

up to ±1100kV

2015 grid

" T wo vertical and two

horizontal" AC pathways

and seven DC lines

F orm the North-China

Central-China East-China

UHV synchronous grid

North China-Central China

-East China power grid.


4. Research

Overview of ±1100kV DC development

Completed project conceptual system design and

released technical specifications.

Proposed the mode of UHVDC hierarchical

connection to 500kV and 1000kV AC system.

Raise the current of UHVDC to 6.25kA

Completed the manufacture of the Model prototype

of converter transformer and valve. both passed the

test evaluation.

Completed the development of DC field switches

including disconnector, earthing switch , transfer

switch and the manufacture of the prototypes, most of

switches passed the test evaluation.


4. Research

DC transmission capacity:

with 5 inches thyristor current 3kA

±500kV capacity=2x500kVx3kA=3000MW

±800kV capacity=2x800kVx3kA=4800MW

4kA 4.5kA 5kA 6.25kA

800kV 6400MW 7200MW 8000MW 10GW

1100kV 11GW 13.75GW

with 6 inches thyristor

■ research in progress


The design scheme of ±1100kV DC

4. Research

DC hierarchical connection

for capacity 10GW and above


4. Research

To raise DC current to 6.25kA

Research shows no critical equipment problem.

Converter transformer, valve and thyristor, smoothing reactor, and DC

field equipments are OK.

But the valve side bushing is a key problem. (ABB,ALSTOM 5kA OK)

Converter transformer transportation is more difficult. the way to resolve

is modular transportation and on-site assembly .


±800kV ±1100kV

62t、63m

112 t、78m

4. Research

±1100kV DC Tower

Based on the research result on

electromagnetic environment, 8

×1000mm2 conductor recom

mended


The wall bushing ( 25.5m , 6.6t )

4. Research

±1100kV DC Bushing

The converter transformer valve side bushing (15.6m, 7.9t )


±1100kV DC transformer

Converter transformer model prototype 1

Converter transformer model prototype 2

4. Research

Estimated size:

14000(length)×4050(width)

×5050(height):

Total weight: 450t

Estimated size:

12000(length)×4800(width)

×5900(height)

Total weight: 650t.


XD-valve prototype XJ-valve prototype C-EPRI-valve prototype

4. Research

±1100kV DC Valve

Three manufacturers completed the design and manufacture of the

±1100kV valve prototype, all passed the test evaluation


XD-disconnector test Pinggao-earthing

switch test

Pinggao-disconnector test

4. Research

±1100kV DC Switches Completed the development of DC field switches, most of which

passed the test evaluation


Thank you

Application of Large- Capacity Transmission...

Documents

Transcript of Application of Large- Capacity Transmission...