SEQUENTIAL CONTROL OF TFTR POWER SUPPLIES

The design of the TFTR power supplies and their control infrastructure provides a maximum of flexibility in terms of control strategy options. Utilizing this inherent flexibility two types of sequential control have been developed. The first, which is presently operational in the Toroidal Field (TF) system, is designed to optimize power factor while permitting two quadrant rectifier operation. The second, which is presently under development and will be used for the TF and Ohmic Heating (OH) systems, is designed to optimize both power factor and distribution of thermal loading while permitting single quadrant rectifier operation only. With these control methods the ultimate capability of the TFTR power supply system is made available.