Transient performances of the 20 kVA superconducting synchronous generator in power systems

This paper describes the electrical transient performance of the experimental superconducting synchronous generator. The generator is connected to a regional power system through two artificial transmission lines in parallel. Several experiments to make clear the transient behavior of the SCG in the power system have been performed. The experiment items are as follows; (1) Steady state stability test by a quasi-stationary increase of the generator output. (2) Disconnecting and reclosing of either line of the transmission lines in parallel. (3) Three-phase grounding fault at the midpoint of the transmission line with reclosing after clearing the fault. (4) Transient stability test by three phase grounding fault with reclosing after clearing the fault. The variations of the terminal voltage, the armature current and the output power of the SCG for these tests have been measured and discussed. In order to understand the transient behavior of SCG´s, the transient analysis by a computer simulation was carried out for the experiments. The simulation results are in good agreement with the experimental results. By use of the simulation results, we calculate the torque and the Joule heating of the cold and the warm dampers for the transient state.