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Robust back-stepping sliding mode control for LCL-type grid-connected inverters in weak grids.
- Source :
-
Journal of Power Electronics . May2023, Vol. 23 Issue 5, p758-768. 11p. - Publication Year :
- 2023
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15982092
- Volume :
- 23
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 163313895
- Full Text :
- https://doi.org/10.1007/s43236-022-00577-w