A Multiple-Reference Complex-Based Controller for Power Converters

• Published in: IEEE transactions on power electronics Vol. 36; no. 12; pp. 14466 - 14477
• Main Authors: Serra, Federico, Doria-Cerezo, Arnau, Bodson, Marc
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Complex Nyquist plots; complex-valued transfer functions; Control stability; Control systems design; Controllers; Cutoff frequency; Harmonic analysis; multiple-complex coefficient filter (MCCF); Power converters; Power harmonic filters; proportional-resonant (PR) complex controller; Robustness; Signal processing algorithms; Stability criteria; three-phase voltage-source converter (VSC); Transfer functions; Uninterruptible power supplies; Uninterruptible power systems
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2021.3088801

A multiple-reference complex-based controller is proposed for three-phase power converters feeding nonlinear and unbalanced loads. The control scheme incorporates a stable multiple-complex coefficient filter with bandwidths that are set arbitrarily and independently for every harmonic under consideration. The multiple-reference complex-based control scheme is applied to an uninterruptible power supply system with a voltage source converter. Each harmonic is controlled using a standard complex proportional-resonant controller that is designed for stability and robustness using the Nyquist criterion. Similar stability and robustness properties follow for the overall system due to the frequency-domain properties of the filter and of the controllers. The proposed methodology is validated in simulation and experimental tests.