Design of inverse controller with cross-coupling suppression for UPFC series converter

The power flow control problem of a transmission line equipped with a Universal Power Flow Controller is investigated. Two controllers for the series converter of a UPFC are proposed. Dynamic or static model inverses are used to linearize control and suppress cross-coupling dynamics. Both controllers realize first order step responses with arbitrary time constant and cross-coupling suppression. Main benefits of these controllers are low controller complexity, minimal required system parameter knowledge and first order system behavior with arbitrary time constant. Controller complexity is no more than two parallel PI controllers for the steady-state inverse controller, or four for the dynamic inverse controller. Cross-coupling suppression performance of both controllers depends only on knowledge of inductance-resistance ratio of transmission line. Simulation results at 1 kHz demonstrate cross-coupling suppression and first order behavior. Control bandwidth allows damping of inter-area oscillations.