抄録
Many long distance cooling channel systems have recently been constructed for superconducting power cables and hollow conductor magnets.
For safe operation of these systems, an automatic control system is required. However, the use of conventional feed back control systems for the long distance cooling channel system has been restricted to a local-pressure, local-temperature or a sequential control method, since the supercritical helium shows nonlinear thermo physical properties.
Authors have so far examined temperature control methods for cooling systems, applicable to superconduting power cables and hollow conductor magnets.
In this paper, a microcomputer control method for temperature of the long distance cooling channel is shown.
The remarkable feature of this control method is an application of system identification, which makes the microcomputer work like a skillful operator even when the cooling system is much complicated and shows nonlinear properties.
The control method is suited for temperature control of superconducting power cables and hollow conductor magnets, since it does not demand accurate thermophysical properties of the supercritical helium, and microcomputers are not expensive today.
