The ITER toroidal field model coil project

228 A. Ulbricht et al. / Fusion Engineering and Design 73 (2005) 189–327
Fig. 4.29. LCT coil and TFMC current ramp up (V1 and I1 LCT coil circuit voltage and current, V2 and I2 TFMC circuit voltage and current.
Measured voltages not available).
I(t)=[I1(t)I2(t)I3(t)I4(t)I5(t)] T , the 5 × 1 vector of currents,
representing the currents in the LCT coil and
TFMC windings, the eddy currents in the LCT coil
case, in the TFMC radial plates and in the TFMC case,
respectively; V(t)=[V1(t)V2(t)] T , the vector of the two
forcing voltages of the two winding circuits, L the
inductance matrix and R the resistance matrix, the currents
in the five circuits can be computed by integrating
the following linear differential equation:
L dI(t)
dt
+ RI(t)V (t) (4.1)
The method used for the calculation of the inductance
matrix L and resistance matrix R, both 5 × 5, is reported
in Appendix A. The resistances of the LCT coil and
TFMC windings (i.e., R11 = 250 �� and R22 =50��)
have been validated experimentally and they are mostly
due to the conventional bus bar system external to the
vacuum vessel (i.e., Al bus bar and flexible cables).
The computer model (developed with SIMULINK)
includes, in addition to the Eq. (4.1), a simplified model
of the thyristor converters with their current transducers
and current feedback modules (see Appendix A for
more details). The model computes the power losses