Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Robust back-stepping sliding mode control for LCL-type grid-connected inverters in weak grids

  • Xin Ding (School of Electrical Engineering, Guangxi University) ;
  • Junyang Liang (School of Electrical Engineering, Guangxi University) ;
  • Shangping Lu (Department of Automation Engineering, Guangxi Vocational College of Water Resources and Electric Power) ;
  • Fannie Kong (School of Electrical Engineering, Guangxi University) ;
  • Yanming Chen (School of Electrical Engineering, Guangxi University)
  • Received : 2022.03.20
  • Accepted : 2022.12.07
  • Published : 2023.05.20
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Abstract

Gird impedance variations in a weak grid can easily lead to the instability of grid-connected inverters with an LCL filter. In this paper, a robust back-stepping sliding mode control strategy for the LCL-type grid-connected inverter is proposed to ensure local asymptotic stability. First, due to its nonlinear switching problem, the model is transformed into the Brunovsky canonical form of a linear system, using the exact feedback linearization theory. Then, to ensure global stability and rapid dynamic performance, a back-stepping sliding mode control strategy is recursively derived. Furthermore, under the premise of asymptotic stability, a robust scheme is developed to obtain appropriate parameters against grid impedance variations. Hence, the expected stability performance can be achieved and the dynamic performance can be improved in a weak grid. Finally, a 2 kW prototype is constructed, and experimental results demonstrate the effectiveness of the proposed controller when compared with the conventional back-stepping scheme.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (51567004), the Natural Science Foundation of Guangxi Province (2021GXNSFAA220136), and the Highlevel Innovation Team and Distinguished Scholar Program of Guangxi Higher Education Institutions under Grant Guangxi teach talent (2020) No. 6.

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