Observer-Based Sliding Mode Control to Improve Stability of Three-Phase LCL-Filtered Grid-Connected VSIs

Min Huang, Han Li, Weimin Wu and Frede Blaabjerg
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Min Huang: Department of Electrical Engineering, Shanghai Maritime University, Shanghai 201306, China
Han Li: Department of Electrical Engineering, Shanghai Maritime University, Shanghai 201306, China
Weimin Wu: Department of Electrical Engineering, Shanghai Maritime University, Shanghai 201306, China
Frede Blaabjerg: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark

Energies, 2019, vol. 12, issue 8, 1-15

Abstract: Grid-connected voltage source inverters (VSIs) with LCL filters have been widely used for distributed generation systems (DGs). Various control methods have been studied to achieve good performance. Among them, sliding mode control has been applied to LCL-filtered grid-connected VSIs for its fast, dynamic response and strong robustness. However, LCL networks can easily cause instability problems under weak grid conditions such as grid impedance variation. At the same time, the stability design of sliding mode control applied for LCL-filtered grid-connected inverters are important, but they lack detailed parameters design in recent papers. In this paper, a design of observer-based sliding mode control to improve the stability of three-phase LCL-filtered grid-connected VSIs was proposed. The theoretical stability analysis was developed to consider the effect of the system discretization and grid impedance variations. Finally, a 3-kW, 110-V, 50-Hz experimental setup has been built to demonstrate the validation of the proposed method.

Keywords: LCL filter; grid-connected inverters; observer; sliding mode control; stability analysis; robustness (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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