Development of a New Superconducting Generator Model for Power System Transient Analysis with XTAP

Superconducting generators (SCGs) are considered to bring many advantages to electric power grids such as high generation efficiency, improvement of power quality, capability to enhance power system stability, and so on. In order to investigate these benefits in the conditions similar to those of a real power system, electromagnetic transient (EMT) analysis in three-phase instantaneous values is very useful. In this study, a new SCG model for power system transient analysis has been developed with an EMT software named Expandable Transient Analysis Program. Novelty of the newly developed model is in the calculation procedure using a two-stage diagonally implicit Runge-Kutta method and a second-order Runge-Kutta method (RK2). The proposed method enabled us to interface the SCG model with the outer power system without prediction or delay. The method is considered to enhance the numerical stability of transient analyses including SCGs by explicitly limiting the integral calculation errors through the use of RK2. It was confirmed that the developed model is useful to EMT analysis including SCGs.