Analysis of topologies, PWM modulation and interleaved strategies for H-bridge power converter parallelization

ROGELIO GARCIA RETEGUI; JEAN PAUL BURNET; NICOLAS WASSINGER; SERGE PITTET; SEBASTIAN MAESTRI; GUSTAVO UICICH

2018-04-01/2018-11-30

1-49

Electrónica

Energia-Electrica

The evolution of the Large Hadron Collider (LHC) into High Luminosity-LHC (HL-LHC) presents different challenges, which determines that an upgrade of the power converters associated to several parts of the facility is required. The power converters associated to the inner triplet magnets is one of them, since in the new conguration 18kA must be reached. Consequently, the development of a 18 kA power converter built from N parallel-connected sub-converters having M modules inside and with integrated energy storage system is foreseen. This report evaluates different topologies and modulation methods, both at module and at subconverter level. The topologies under analysis differs on each other on the use of a single or multiple input sources associated to the ESS, and the use or not of an electrical vinculation between input and output. With respect to the modulation methods, two aspects are considered: the command signals inside a module, where sawtooth comparison signal and triangle comparison signal are evaluated, and the time displacement between the command signals, named interleaved, useful to decrease the current ripple amplitude. Three figures of merit were selected to compare the different cases: (i) the RMS magnet current, which denes the precision; (ii) the harmonic content of the common mode output voltage, which denes Electromagnetic Compliance issues; and (iii) the harmonic content of the ESS current, which denes the sizing and characteristics of the storage system. The amount informed in the technical report corresponds to the 30% of firts stage of the R & D agreement "Study of Power Converter Topologies suitable for HL-LHC Inner Triplet magnets with Energy Recovery".