latest hvdc light developments - university of idaho · 2012-08-31 · latest hvdc light...

Latest HVDC Light developments

IEEE Montreal 2006-06-21

Gunnar AsplundHVDC R&D Manager

Sweden

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HVDC Light® , continuous reactive power control

Instantaneous control of active and reactive

power over a wide area

P (pu)

HVDC Light®

Q (p.u.)

HVDC static

HVDC dynamic

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Comparison HVDC-Classic und HVDC-Light HVDC-Classic HVDC-Light

Technology Convertor

Current Source ConverterThyristor valve, grid

commutation

Voltage Source Converter (VSC)Transistor valve (IGBT), self

commutation

Between stations Overhead line Oil impregnated cable (mainly

sea cable)

Extruded cable for both land and sea

Dimensions Valve hall and outdoor ac- yard Compact valve arrangement. Low profile and indoor ac and dc- yard

Applications Bulk power transfer, back to back, interconnection of asynchronous networks

Wind farms at sea, oil platforms, reinforcement of ac- systems, back to back between weak systems

Reactive support By switched capacitor or filter banks

By the converter independent of the active power

AC network requirement

Short circuit ratio > 2 No requirement. Can start black network.

Power reversal Polarity has to be changed No polarity change

Multiterminaloperation

Complex Simple

Telecommunication Needed for start and operation Not needed.

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The cable is the key for HVDC Light®

Cables from ABB1350 km installed HVDC Light® cables since 1998

745 km installed XLPE cables above 220 kV since 1978out of totally about 4000 kminstalled world-wide

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HVDC Light® Cable Development

2006Southern Link1600 mm2 Al conductor+/- 300 kV, 700 MW

2001Murraylink, 360 km1400 mm2 Al conductor+/- 150 kV, 220 MW

1997HellsjönPrototype cable95 mm2 Al conductor+/- 10 kV, 3 MW

2000Directlink, 390 km630 mm2 Al conductor +/- 80 kV, 60 MW

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Cable laying

Fiber Optic Cable HVDC Light® Cable

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HVDC Light® , transfer capability

Power capability of ac and dc cables

0

100

200

300

400

500

600

700

0 40 80 120

160

200

240

280

320

360

400

440

480

Distance in km

Pow

er in

MW

+/- 300 kV DC cable

400 kV AC cablecompensated inone end

400 kV AC cablecompensated ineach end

HVDC Light® has no limitation in distance

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HVDC Light® ,Matrix

DC Voltage 500 A 1000 A 1500 A+/- 80 kV M1- 95 MVA M2- 190 MVA M3- 285 MVA

+/- 300 kV M7- 356 MVA M8- 713 MVA M9- 1070 MVA+-150 kV M4- 178 MVA M5- 356 MVA M6- 535 MVA

Avaliable 2006

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Estlink 350 MW, +/- 150 kV, 75 km sea cable, 25 km land cable

Espo june 14

Finland

Estonia

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HVDC Light layout for 300 kV

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The southern link HVDC Light +/- 300 kV 700 MW

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AC line emulation

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N-1 criteria

The ac- system should not be loaded more than it can safely withstand the loss of any line or generator

Comment: This means that an HVDC Light transmission inside an ac network should have the same capability as an ac line

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Voltage stability of one remaining ac- line

0 200 400 600 800 10000

2 .105

4 .105

Without compensation

Voltage versus power

Power in MW

Vol

tage

in k

V Maximum power

Voltage collaps

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Dynamic stabilityEqual area

0

0,2

0,4

0,6

0,8

1

1,2

0 10 20 30 40 50 60 70 80 90 100

110

120

130

140

150

160

170

180

Area1

Area2

delta0

delta1delta2

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AC line

0 100 200 300 400 500 6000

2 .108

4 .108

6 .108

8 .108

1 .109

1.2 .109

Dynamic stabilityMax powerVoltage stabilityThermal limit

400 kV ac line capability

Distance in km

Pow

wer

in M

W

.

Potential additional power

0 100 200 300 400 500 6000

2 .108

4 .108

6 .108

8 .108

1 .109

1.2 .109

Dynamic stabilityMax powerVoltage stabilityThermal limit

400 kV ac line capability

Distance in km

Pow

wer

in M

W

.

Potential additional powerPotential additional power

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Damping power needed in the HVDC Light

Inertia 4 sProtection time 100 ms

2 4 6 8 1016

18

20

22

24

26

28

30

32

Number of lines

Perc

ent o

f ac-

line

pow

er

.

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HVDC Light compared to an ac- line

Distance 400= Nlines 2=

0 100 200 300 400 500 600 7000

200

400

600

800

1000

1200

Total converter powerActive converter powerReactove converter powerPower in one ac line

Active converter power in MW

Pow

er in

MV

A

Distance 400= Nlines 2=

0 100 200 300 400 500 600 7000

200

400

600

800

1000

1200

Total converter powerActive converter powerReactove converter powerPower in one ac line

Active converter power in MW

Pow

er in

MV

A

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Valhall 78 MW, 292 km cableThe existing Valhall complex.

HVDC module

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Troll A, converters on the platform

The converters are housed in a pre-fabricated module, shipped and lifted onto the platform.

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HVDC Light- multi terminal

Several ac- nets are connected via one dc- net

latest hvdc light developments - university of idaho · 2012-08-31 · latest hvdc light...

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