Controller action and control of a 330 kVA synchronous generator with a superconducting excitation winding

Theoretical and experimental investigations were conducted during the last two years on the control of a 330-kVA synchronous generator with a superconducting field winding. The generator is connected either to the mains or to an island network. The superconducting field winding of the two-pole external pole synchronous generator is cooled indirectly by supercritical helium in a closed cooling circuit. The machine is controlled digitally by microcomputers at grid or island operation. A summary is given of test results on controlled generator operation (load decrease, variation of active and reactive power). Measured values are compared to the values gained from simulation are discussed