High response excitation control of superconducting generator for stability of superconducting field winding

Superconducting Generators (SCG's) can improve power system stability in st eady state and also in transient state with a high response excitation. The authors designed and made an experimental 100kVA SCG with high response ex citation and carried out several experiments for power system stability usi ng an artificial transmission lines. In this paper, a high response excitat ion control of SCG considering stability of the superconducting field windi ng is discussed and tested. A proposed control system has limiter(Over Exci tation Limiter : GEL) functions for not only the field current but also for its differential-value (voltage). These factors affect a design of the fie ld windings. Transient stability tests were performed by using the test gen erator and the artificial transmission lines with and without the proposed excitation control. The effects of the proposed control on the transient st ability were studied.