Experiments on Transient Characteristics at Parallel Running of a Superconducting Generator and a Conventional One

Abstract

In order to define problems on superconducting generators (SCG) in power systems, we have been studying characteristics of SCG by use of the 20kVA SCG. In this paper, we describe one result of our studies, that is, Parallel running experiments of the 20kVA SCG and a conventional generator (CG). In the experimental system, the SCG is connected to regional power system (infinite bus) through reactors (artificial transmission lines) and the CG is connected to the terminal of the SCG. The system becomes unstable by increasing the output power of either generator. We pay attentions to processes where the system is going to an unstable state. We observe two types of the processes, that is, the slip of SCG is positive or negative. After isolating the CG at unstable states, two cases are observed, that is, the SCG returns to stable operation or not. By simulation studies, we discuss, in detail, the above mentioned characteristics given by experiments.