Robust back‑stepping sliding mode control for LCL‑type grid‑connected inverters in weak grids

Xin Ding; Junyang Liang; Shangping Lu; Fannie Kong; Yanming Chen

Robust back‑stepping sliding mode control for LCL‑type grid‑connected inverters in weak grids

Vol. 23, No. 5, pp. 758-768, May 2023

10.1007/s43236-022-00577-w

Grid-connected inverter

Feedback exact linearization

Back-stepping sliding mode control

Robust scheme

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.

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Cite this article

[IEEE Style]

X. Ding, J. Liang, S. Lu, F. Kong, Y. Chen, "Robust back‑stepping sliding mode control for LCL‑type grid‑connected inverters in weak grids," Journal of Power Electronics, vol. 23, no. 5, pp. 758-768, 2023. DOI: 10.1007/s43236-022-00577-w.

[ACM Style]

Xin Ding, Junyang Liang, Shangping Lu, Fannie Kong, and Yanming Chen. 2023. Robust back‑stepping sliding mode control for LCL‑type grid‑connected inverters in weak grids. Journal of Power Electronics, 23, 5, (2023), 758-768. DOI: 10.1007/s43236-022-00577-w.