Novel Integral Sliding Mode Control Applied to High-Power DC Power Supplies

In this article, a novel integral sliding mode controller is proposed to ensure the output accuracy of the high-power DC power supply with variable output voltages and unknown loads and the proposed controller is applied to a 3.2 kW high-power DC power supply. Conventional sliding mode control is ro...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2024-02, Vol.12 (1), p.1-1
Main Authors: Zeng, Min, Wei, Qincheng, Xie, Jianxing
Format: Article
Language:English
Subjects:
Accuracy
Buck converters
Control systems
Control theory
Controllers
Disturbances
Dynamic characteristics
Electric power supplies
Error analysis
high-power DC power supply
Inductors
integral sliding mode control
nonlinear control method
Power supplies
Power supply
Robust control
Sliding mode control
Switches
Switching
Switching frequency
Uncertainty
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Summary:In this article, a novel integral sliding mode controller is proposed to ensure the output accuracy of the high-power DC power supply with variable output voltages and unknown loads and the proposed controller is applied to a 3.2 kW high-power DC power supply. Conventional sliding mode control is robust to matched disturbances, while it is sensitive to switching frequency and mismatched disturbances. In the proposed controller, the switching function is scaled and added to the control law, so that the integral term can act directly on the control law and help eliminate the influence of the switching frequency and the output error. The recommended values of the designed parameters are given to simplify the computation and improve the robustness. Moreover, the relationship between the output error and convergence time is analyzed. The simulation and experiment results show that compared with conventional integral sliding mode control, the proposed method alleviates the influence of the low switching frequency, improves the output accuracy and output ripples; compared with PI control, the proposed method shows better dynamic characteristics.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2023.3340874