Abstract
High current magnetic power supply for superconductivity coil of tokamak requires fast dynamic performance of di/dt and smooth change over of current direction. To meet these specifications, high performance DSP-based controller is designed for 12-pulse thyristor dual converter with inter-phase transformer (IPT). Not only the total current of Y- and Delta-converter units, but also the difference for those, should be regulated fast and accurately. Proportional and integral controller is designed for difference current control and the controller output is compensated to Delta-converter. A new algorithm for the calculation of the initial firing angle is proposed for the minimization of non-ideal effect during the change over of dual converter currents.
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