A Robust Switching Control Strategy for Three-Phase Voltage Source Converters with Uncertain Circuit Parameters

Xin Guo, Jichen Qiao, Yankai Li and Shangbin Jiao ()
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Xin Guo: School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
Jichen Qiao: School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
Yankai Li: School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
Shangbin Jiao: School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China

Energies, 2024, vol. 17, issue 8, 1-18

Abstract: This study proposes a novel double closed-loop robust control strategy based on a power switching affine model of three-phase voltage source converters (VSCs). The aim is to overcome the challenges posed by inaccurate mathematical models, complex controller configurations, indirect switching control, and performance degradation under circuit parameters uncertainty or load variation in conventional methods. These conventional methods rely on linearization models, duty ratio regulation, and pulse width modulation (PWM) technologies. The contributions of work are the following: (1) A two-dimensional (2D) power switching affine model is constructed without any approximation or averaging. (2) The proposed approach achieves direct switching control of three-phase VSCs, eliminating the need for complex rotation coordinate transformation, PWM, and phase locking loop (PLL), which are utilized in traditional control methods. (3) The rigor of the system stability analysis is enhanced based on the 2D power switching model compared to the existing three-dimensional (3D) current switching model. (4) A simple control structure with only two control parameters is employed to address circuit parameter uncertainties. The effectiveness and superiority of the proposed method is validated through simulation and experimental comparison results.

Keywords: three-phase VSCs; circuit parameters uncertainty; load variation; switching system; sliding mode observer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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