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Genova, Italy

Zito P.,ENEA | Lampasi A.,ENEA | Coletti A.,Fusion for Energy F4E | Novello L.,Fusion for Energy F4E | And 6 more authors.
Fusion Engineering and Design | Year: 2015

Fast Plasma Position Control Coils (FPPCC) PSs control the vertical position of the plasma during a plasma shot, to prevent Vertical Displacement Event (VDE), using FPPC coils installed in vacuum vessel for JT-60SA. For this task, the FPPCC PSs have to be very fast for reacting to plasma movements. Further, an open loop feed forward voltage control is adopted in order to achieve a fast control of FPPCC PSs. The main characteristics are: 4-quadrant AC/DC converter 12-pulse with circulating current, DC load voltage ±1000. V and DC load current ±5. kA.The overvoltage induced by FPPC coil during a plasma disruption can reach 10. kV and it is protected by a nonlinear resistor in parallel to the crowbar up to its intervention. All these technical characteristics have strongly influenced the design of the FPPCC converter and transformers which have been validated by simulation model of FPPCC PS. The outcomes of the simulation allowed to finalize the performances and dynamic behavior of voltage response. © 2015 Elsevier B.V.

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