Power Converter Characteristics Operation Responsibles Power Converter Architecture Power Part Control & Regulation Part

Machine Installation Production Contract & Contract History

Power Converter Characteristics

Operation Responsibles

1st Intervention	Piquet SY-EPC LHC(161919)
Responsibles:	Xavier GENILLON
	Yves GAILLARD

Power Converter Architecture

The active filter is used to reduce the output voltage ripple of the LHC thyristor-power converters and to increase its voltage bandwidth.

An injection transformer is placed in series with the output capacitor bank.

The active filter has the characteristics of a voltage generator that injected through an isolation transformer a voltage Uc which is the opposite of the output voltage , in order to reduce the output ripple. It must be capable of withstanding the current caused by bridge rectifier or unusual transitional regimes.

Without active filter:

• Output residual voltage = 1% of U out max
• Bandwidth in voltage is in the range of 40 Hz
• Network disturbances are weakly rejected.

With active filter:

• Output residual voltage = 1‰ of U out max
• Bandwidth in voltage is in the range of 10 KHz
• Network disturbances are rejected.

LHC AF power converter architecture

Power Part

Power Part simplified Architecture / Topology .pdf

Control & Regulation Part

Regulation Control simplified schematic

Machine Installation

Number of LHC Active Filters installed in LHC:

• 2175 (SR1) RPTG : 1
• 2218 (UA23) RPTE : 1
• 2239 (UA27) RPTE : 1
• 2375 (SR3 Left) RPTF : 1
• 2375 (SR3 Center) RPTF : 1
• 2375 (SR3 Right) RPTG : 1
• 2418 (UA43) RPTE : 1
• 2439 (UA47) RPTE : 1
• 2575 (SR5) RPTG : 1
• 2618 (UA63) RPTE : 1
• 2639 (UA67) RPTE : 1
• 2775 (SR7 Left) RPTF : 1
• 2775 (SR7 Center) RPTF : 1
• 2775 (SR7 Right) RPTG : 1
• 2818 (UA83) RPTE : 1
• 2839 (UA87) RPTE : 1
• 866 SPARE : 3

Production Contract & Contract History

• Manufacturer: CERN
• Production year: 2006