lauren sabine 2015-11-12 nordlink - weekly...

1JNL365433

NordLink - Weekly Meetings

© ABB Group December 16, 2015 | Slide 1

Lauren Sabine 2015-11-12

1JNL365433


NordLinkBasic data

Ertsmyra-Vollesfjord-Wilster

Bipole VSC at ±515 kV, 1400 MW.

Each pole at each station is configured as an asymmetric monopole.

50 km DC OH line

571 km subsea cable,

54 km land cable

1JNL365433

© ABB Group Slide 3

Fast and accurate power flow control

Support the AC networks (SVC)

Connect AC networks asynchronously

Black start capability

IntroductionWhy do we use HVDC Light?

1JNL365433

NordlinkMonopole vs Bipole Converter


Asymmetrical monopole:A single converter that is connected between the positive or the negative pole and the d.c. side neutral. The other pole is used as metallic return path.

Asymmetrical monopole converter.

Bipole:An HVDC system consisting of two poles, which during normal operation, exhibit opposite d.c. voltage polarities with respect to earth.

Bipole.

1JNL365433

NordLinkGeneral conceptBipole with earthed neutral on only one converter


Ertsmyra WilsterVollesfjord

Pole 1 (+)

Pole 2 (‐)

Pole 2 (‐)

Pole 1 (+)

1JNL365433

NordlinkSingle Line Diagram


1JNL365433

NordLinkSome Challenges

Isolated converter neutral on Norway side

Transition between Bipole to monopole operation

DC OH lineo Earth faults

o Interference from parallell AC OH line

Operation at 80% DC voltage

Transport of Transformers


1JNL365433

NordlinkTransition between bipole to monopole operation


1JNL365433

NordlinkInterference from AC OH lines


1JNL365433


Valve BasicsVSC converter

IV

UV

Two-level converter phase-to-neutral voltage

UC

IV·XV

UC

+ Ud

- Ud

UAC

Fundamental of UV+ Ud

- Ud

Active and Reactive power flow controlledby controlling the amplitude and phase angleof Uv.

1JNL365433

NordlinkTechnology


2-level converter+ Ud

- Ud

+ Ud

- Ud

1 Cell

0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.02-300

-200

-100

0

100

200

300M9 version 2.2, 320kV, M2LC, P=3.37, N=35, C=1mF, no 2nd harm

VSC Toolbox version 2.4. 05-Dec-2008 10:22:05

Uv(

t) [k

V]

time s

1JNL365433

NordLinkML2C principle

1JNL365433



Turning T1 off and T2 on

Turning T2 off and T1 on

Both valves are turned off, the cell becomes blocked. Current is conducted only through the diodes.

D1

D2

T1

T2

C

D1T1

D2T2

C

IvpaD1

D2

T1

T2

C

D1T1

D2T2

C

UvIvna

Iv

Lv

Lv

Ucp1a

+Ud

-Ud

A cell can be switched in three modes.

1JNL365433



Id

Id

Iac

Id/3+Iac/2

Id/3+Iac/2

1JNL365433


Electrical DesignCell capacitor charge and discharge

Udp

D1

D2

T1

T2

C

D1T1

D2T2

C

IvpaD1

D2

T1

T2

C

D1T1

D2T2

C

UfIvna

Iv

Lv

Lv

Ucp1

a

Ucn1

a

1JNL365433


Electrical Design Cell capacitor charge and discharge

Udp

D1

D2

T1

T2

C

D1T1

D2T2

C

IvpaD1

D2

T1

T2

C

D1T1

D2T2

C

UfIvna

Iv

Lv

Lv

Ucp1a

Ucn1

a

1JNL365433

29

30

29

30


Mechanical DesignValve arm

1JNL365433

NordLinkLayout Ertsmyra Converter Station

1JNL365433

NordLinkLayout Wilster Converter Station

1JNL365433


Mechanical Design

1JNL365433

NordLinkVollesfjord Transition Station


1JNL365433

NordlinkConverter Transformers


• Single phase units

• Y-Delta (delta on converter side)

• DC component on converter side

• Tap changer on line side

• Line side neutral solidly earthed

1JNL365433

NordlinkErtsmyra Site


1JNL365433


lauren sabine 2015-11-12 nordlink - weekly...

Documents