Abstract
For the nuclear fusion experiment ASDEX Upgrade (AUG) an inverter system to individually feed the 16 in-vessel saddle coils was built. After an operating phase with four inverters that supplied groups of up to 4 coils connected in series, now the full system is working. The common DC-link is fed by an existing current-mode thyristor rectifier.The idea was to use the thyristor rectifier in voltage control mode. Therefore the control system and the power stack had to be adjusted. This publication describes the modifications made to the thyristor rectifier in order to feed a DC-link and stabilize its voltage under all load conditions. Also the integrated safety systems are shown.
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