Excitation control system design of superconducting generator with high response excitation considering SMES effect for stability improvement

Superconducting generators (SCG) with superconducting field windings have many advantages such as small size, lightweight, high generation efficiency. In particular, the property of low synchronous reactances, which is not realized in conventional generators, is able to improve power system stability. In addition, transient stability can be improved by effect of high response excitation of self-excited SCG, which enables the rapid change of field current and in turn of excitation power. The field winding connected to the power system through converter is considered as superconducting magnetic energy storage (SMES); hence, its effect is called "SMES effect". In this paper, excitation control system for SCG with high response excitation considering SMES effect is proposed for stability enhancement by employing eigenvalue sensitivity. The control performance of the proposed control system is examined in three-machine nine-bus system along with discussion about SMES effect.