Synthesis and Simulation of a Two-Level Magnetic Control System for TokamakReactor Plasmaстатья
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Дата последнего поиска статьи во внешних источниках: 3 июня 2014 г.
Аннотация:Synthesis and simulation of a hierarchical (twolevel) magnetic system for controlling a tokamak
reactor plasma throughout the entire divertor discharge stage, including the plasma current rampup phase,
are carried out. The plasma vertical velocity is stabilized about zero by using a proportional controller in a sca
lar control loop. The gain of the controller—the coefficient that ensures the required stability margins—is
found by using a secondorder linear model constructed by solving the identification problem on the basis of
numerical experiments carried out with the DINA plasmophysical computer code. The internal cascade (the
lower level of the system) for tracking the scenario currents in the poloidal magnetic field coils is synthesized
by using the complete dynamic channel decoupling method. The external cascade (the upper level of the sys
tem) for tracking the plasma current and shape is synthesized by using the method of pseudoseparation of the
control channels and the multidimensional diagonal proportionalintegral controller, with proportional,
integrating, and double integrating units connected in parallel in each channel. In the hierarchical control
system, the lower level (the internal cascade) is subordinated to the upper level (the external cascade). The
external cascade acts on the internal one by the signals that set the required currents in the coils of the central
solenoid and of the poloidal magnetic field in order to ensure the required plasma current and shape in accor
dance with the output signals from the plant, which are transmitted through the vector feedback channel. The
lower level is aimed exclusively at tracking the reference inputs by tracking the currents in the control coils.
An operating mode of the system under the conditions of current saturation in the control coils is proposed
and implemented. Results are presented from numerical simulations of the twolevel (cascade) control sys
tem for reference scenario no. 2 of the ITER database (www.iter.org) with the DINA nonlinear code.