Deadbeat control for unified power flow controller with 3-phase unbalanced compensation

Flexible AC Transmission System (FACTS) is applied to manage a number of varied situations of the power line. The Unified Power Flow Controller (UPFC) as one of the FACTS is used in order to keep conditions of the power line. The UPFC consists of two components. One is connected in parallel to the power line, and the other is connected in series. By the parallel system, the reactive power and 3-phase unbalance can be compensated to improve the power factor and to keep the common DC capacitor voltage constant. By the series component, the voltage drop can be compensated to maintain proper line voltage. In these operations, quick response is required in order to respond variable situations. In this study, the deadbeat (DB) control is applied for the advantage of quick response and easy setting without the gain design. The principle of the DB control, simulation results, and experimental results are presented for verification of its characteristics in this paper.