Abstract
In order to understand some characteristics on superconducting generators (SCG's) in power systems, experimental studies by using the 20kVA SCG have been performed. It is necessary to inverstigate the characteristics for parallel operations of an SCG and a conventional generator(CG) when an SCG is installed to a present power station. In this paper, we describe some results of our studies on parallel running of the 20kVA SCG and the 20kVA CG. In the experimental system, the SCG is connected to regional power system (infinit bus) through reactors (artifical transmission lines) and the CG is connected to the terminal of the SCG. By the experiments and computer simulation, we investigate the transient characteristics at three-phase short-circuit faults 1) when CG is not isolated and 2) when CG is isolated after reclosing. We obtain two kinds of stable limit curves for output power at three-phase short-circuit fault for above two cases.
