Rotary Power-Flow Controller for Dynamic Performance Evaluation—Part I: RPFC Modeling

This paper (Part I) presents a model suitable for the performance analysis of a rotary power-flow controller (RPFC), which operates in a two-lines power system corridor. The RPFC consists of two transformers (one series and one shunt), and two rotary phase-shifting transformers operating in standstill. The shunt and series transformers and the two rotary phase-shifting transformers are represented by the conventional equivalent circuit of a two-winding transformer. The rotor windings of these rotary phase-shifting transformers are connected in parallel while their stator windings are in series. The resulting equipment is the RPFC whose macroscopic model is proposed. The model involves a series branch consisting of an adjustable voltage source (with its internal impedance) and a shunt branch consisting of a current source. The obtained RPFC model with the regulators, implemented in SPS/Matlab, is used for further simulations in Part II.