Research on characteristics and power flow control strategy of rotary power flow controller

Rotary power flow controller (RPFC) has the advantages of simple control method, output without harmonics, high reliability and low costs when applied to power flow control. The mathematical model is analyzed and the equivalent model is established. Then, the characteristics of RPFC are studied and the relationship between the RPFC injected voltage and rotor angles is derived, and the power flow control characteristics of RPFC are analyzed. The line voltage magnitude and phase have different sensitivity ranges when RPFC is installed, therefore the active and reactive power regulation have different sensitivity regions, and RPFC can control power flow in a round area, which is determined by the maximum ratio of voltage injected by RPFC. The correctness of RPFC model and steady state characteristics as well as the effectiveness of RPFC are verified by the simulation results of the RPFC operating in a transmission corridor in PSCAD/EMTDC.