Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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General method for state-space modeling and nonlinear control of single-phase cascaded multilevel inverters with LCL coupling

  • Hassan Manaf Miralilu (Department of Electrical Engineering, Ardabil Branch, Islamic Azad University) ;
  • Mahdi Salimi (Faculty of Engineering and Science, University of Greenwich) ;
  • Jafar Soltani (Faculty of Electrical and Computer Engineering, Isfahan University of Technology) ;
  • Adel Akbarimajd (Department of Electrical Engineering, University of Mohaghegh Ardabili)
  • Received : 2022.12.28
  • Accepted : 2023.05.26
  • Published : 2023.08.20
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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.

Keywords

Acknowledgement

This article was derived from Ph.D. degree thesis in Islamic Azad University-Ardabil branch.

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