Superspiral sliding mode active disturbance rejection control strategy based on four active bridge converters

By combining an extended state observer and super-helical sliding mode control, the dynamic response and robustness issues of the four active bridge converter under multi-port coupling are solved, achieving independent port control and fast response, thus improving the control effect of the system.

CN121923501APending Publication Date: 2026-04-24CHINA UNIV OF MINING & TECH
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Patent Information

Application Number
CN202610114738.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-28
Publication Date
2026-04-24

AI Technical Summary

Technical Problem

Traditional four-phase active bridge converters struggle to achieve independent power control under multi-port high-frequency transformer coupling, resulting in slow dynamic response and poor robustness. Furthermore, traditional PI control methods have limited effectiveness in nonlinear systems.

Method used

A method combining an extended state observer (ESO) and a superspiral sliding mode control is adopted. The ESO is used to observe and compensate for system disturbances in real time. The sliding mode controller is combined to achieve system decoupling and chattering suppression. The superspiral algorithm is used to optimize the controller design and realize independent port control.

Benefits of technology

This achieves high precision, fast response, and improved robustness of the QAB converter within a finite time, reduces dependence on the system model, eliminates the coupling effect between ports, and improves the reliability and efficiency of control.

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Abstract

The invention relates to a superspiral sliding mode active disturbance rejection control strategy based on a four-active bridge converter, and the method comprises the following steps: employing an extended state observer to estimate uncertain factors, unmodeled dynamics and coupling terms in a system, putting the disturbance estimation into superspiral sliding mode closed-loop control for elimination, and independent control of voltages of all ports is realized. After voltage and phase shift of each port of the four-active bridge converter are input into an extended state observer to estimate total disturbance of a system, given voltage is input into a differential tracker to eliminate influence of sudden change of the given voltage on a control effect, and obtained tracking voltage and observed voltage of the observer are input into a subtractor for subtraction; the method comprises the following steps of: inputting the obtained error quantity into a sliding mode controller, obtaining a phase shift ratio di through corresponding operation, giving phase shift ratios d2, d3 and d4 between primary and secondary side ports, generating corresponding PWM (Pulse-Width Modulation) signals, driving corresponding switching tubes to be switched on and switched off, and realizing independent voltage control and more efficient and reliable control operation of each port.
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