Through theoretical analysis of thyristor switch, criterion of turn-off was derived for
the design of thyristor switch. The expression of parameter design and its math model during the
turn-off were deduced. The simulation and experiment have been accomplished to validate the
analysis.
This paper presents the preliminary design of poloidal field power supply system of HT-7U super-conducting tokamak. With an emphasis on AC/DC power converter, DC circuit breaker, quench protection, harmonic suppression and static var. compensation, and AC power system, the design principle and features are introduced, the design scheme and R & D progress are described, the simulation studies and laboratory test are presented too.
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