A Robust Nonlinear Control Scheme for a Sag Compensator Active Multilevel Rectifier Without Sag Detection Algorithm

• Published in: IEEE transactions on power electronics Vol. 27; no. 8; pp. 3576 - 3583
• Main Authors: Lira, Jesus, Visairo, Nancy, Nunez, Ciro, Ramirez, Adrian, Sira-Ramirez, Hebertt
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active multilevel rectifier; Algorithms; Applied sciences; Convertors; Diodes; Disturbances. Regulation. Protection; Electric power; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; generalized proportional-integral (GPI) controllers; Input output; Mathematical model; Nonlinear systems; Power networks and lines; Prototypes; Rectifiers; Regulation and control; robust nonlinear control; Robustness; sag compensation; Steady-state; Voltage control; Voltage fluctuations; Dynamic response; Input output; Rectifier; Dynamic characteristic; Prototype; generalized proportional-integral (GPI) controllers; Control system; Active multilevel rectifier; sag compensation; Non linear control; Power system stability; Experimental study; Algorithm; Robust control; Compensator; Voltage stability; System simulation; Robustness; Voltage dip; Multilevel system; robust nonlinear control; Electric fault; Linearization
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2012.2185516

In this paper, a robust nonlinear control scheme is proposed for the single-phase active multilevel rectifier (SPAMR) subject to voltage input sags. The scheme is based on the input-output model of the rectifier system combined with exact linearization achieved via generalized proportional-integral (GPI) control. The GPI controller provides enhanced robustness for the SPAMR against unexpected voltage sags and load changes. The main contribution of this paper resides on avoiding the need for voltage sags detection algorithms while improving the dynamic response of the SPAMR. Simulation and experimental results obtained on a 1-kVA SPAMR laboratory prototype are presented.