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.
Highlights
Due to energy demand and environmental problems, a grid-connected voltage source inverter (VSI) has been widely used in new energy power generation, especially in distributed generation systems (DGs) [1,2,3]
An observer-based sliding mode control method is proposed to improve the stability of the three-phase LCL-filtered grid-connected VSI
Compared to a traditional sliding mode control method, the proposed control algorithm is based on a state observer and active damping method to improve the robustness against the grid inductance and system parameters variations
Summary
Due to energy demand and environmental problems, a grid-connected voltage source inverter (VSI) has been widely used in new energy power generation, especially in distributed generation systems (DGs) [1,2,3]. There are few papers which have provided a detailed design procedure of the sliding mode controller parameters of the LCL-filtered grid-connected inverter. An observer-based sliding mode control method is proposed to improve the stability of the three-phase LCL-filtered grid-connected VSI. This paper is organized as following: Section 2 introduces the modeling of a three-phase grid-connected VSI with an LCL filter in αβ reference frame; Section 3 analyzes the proposed control approach and the design procedures; Section 4 presents experimental results of the whole system to verify the effectiveness and the theoretical considerations of the proposed method.
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