1LARSSON SE Session 2 – Block 2

Barcelona 12-15 May 2003

The new 150 Mvar, 18 kV SVC at CERN – background, design

and commissioningK. Kahle, J Pedersen, CERNT Larsson, M M de Oliveira, ABB

2LARSSON SE Session 2 – Block 2

Barcelona 12-15 May 2003

Background• CERN: European Organization for nuclear

research (particle accelerators) in Geneva, CH• ABB: Delivery and installation of a new Static

Var Compensator• The load:

– Particle accelerator Super Proton Synchrotron, SPS– 12-pulse thyristor power converters for accelerator

magnets– Heavily pulsating active and reactive power– Sensitive to harmonic distortion

3LARSSON SE Session 2 – Block 2

Barcelona 12-15 May 2003

Design• SVC:

– 150 Mvar: Thyristor Controlled Reactor, TCR– 130 Mvar: 8 harmonic filters

F2 F3 F5TCR F7 F11 F13 HF1 HF2Pulsating

TransformerEHT2

EMD2/BE 18 kV

Load

4LARSSON SE Session 2 – Block 2

Barcelona 12-15 May 2003

Commissioning results• Load current: pulsating every 14 seconds

from zero to 4500 A

• Voltage response: Voltage fluctuations below +/- 0.3 % (0.75 % transiently),14 % without SVC

• Harmonic distortion: THD below0.75 %, 20 % without SVC

0 5 10 150.975

0.98

0.985

0.99

0.995

1

1.005

1.01

1.015Phase-to-phase RMS voltage

[p.u

.]

Time [s]

0 5 10 150

500

1000

1500

2000

2500

3000

3500

4000

4500

5000Load RMS current

[A]

Time [s]

0

0,1

0,2

0,3

0,4

0,5

2 3 5 7 11 13 17 19 23 25

5LARSSON SE Session 2 – Block 2

Barcelona 12-15 May 2003

Conclusions

• Excellent performance possible with a classic SVC for sensitive and dynamic loads

• It is possible to accurately model the process in computer programs and to predict the system behaviour