SSSC circuit model for three-wire systems coupled with Delta-connected transformer

This paper presents a new circuit model of SSSC based on state equations in three-wired systems. SSSC is a series compensator of FACTS family. It injects an almost sinusoidal voltage with variable amplitude and is equivalent to an inductive or a capacitive reactance in series with the transmission line. The analysis of a power electronics system is complex, owing to its switching behavior. Since such a system has its special complexities, the need for simpler model is essential, though a more practical one is sometimes appropriate. With simple changes, this paper's model shows different states of SSSC, both transient and steady states, in the range of ideal to practical as confirmed by MATLAB simulation. This model is suitable for circuit simulation software such as MATLAB or PSPICE and is proper to control process and control methods. This model can be used as a starting point for further investigations on control methods in the future.