Miralilu, Hassan Manafi, Salimi, Mahdi ORCID: https://orcid.org/0000-0003-3007-3027, Soltani, Jafar and Akbarimajd, Adel (2023) General method for state-space modeling and nonlinear control of single-phase cascaded multilevel inverters with LCL coupling. Journal of Power Electronics. pp. 1-12. ISSN 1598-2092 (Print), 2093-4718 (Online) (doi:10.1007/s43236-023-00658-4)

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Abstract

Due to the nonlinear behavior of grid-connected cascaded multilevel inverters (GCCMI), the use of nonlinear controllers can guarantee system stability over a wide range of operation. Therefore, state-space modeling is required to design nonlinear controllers. In this manuscript, a comprehensive method is proposed for the general state-space modeling of an n-level GCCMI with LCL coupling. To validate the accuracy of obtained state-space model, an experimental setup of a cascaded multilevel inverter including two H-bridges has been implemented. The outputs of the state-space model are compared with the simulation and experimental results of the GCCMI. This shows that the proposed model is compatible with a real closed-loop system. The simulations were performed using EMTDC/PSCAD software. In the following, the designed general model is used to develop a nonlinear controller based on the Lyapunov stability criteria for a multilevel shunt active power filter (SAPF). Results show that the designed controller is stable and robust in a wide range of operating point changes.

Item Type:	Article
Uncontrolled Keywords:	cascaded multilevel inverter; state-space modeling; nonlinear controller; active power filter; Lyapunov; function
Subjects:	Q Science > Q Science (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	25 Sep 2023 14:15
URI:	http://gala.gre.ac.uk/id/eprint/43090

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