LARSSON SE Session 2 – Block 2 Barcelona May The new 150 Mvar, 18 kV SVC at CERN – background, design and commissioning K. Kahle, J Pedersen, CERN T Larsson, M M de Oliveira, ABB

LARSSON SE Session 2 – Block 2 Barcelona May 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

LARSSON SE Session 2 – Block 2 Barcelona May Design SVC: –150 Mvar: Thyristor Controlled Reactor, TCR –130 Mvar: 8 harmonic filters

LARSSON SE Session 2 – Block 2 Barcelona May 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 below 0.75 %, 20 % without SVC

LARSSON SE Session 2 – Block 2 Barcelona May 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