Improved Sliding Mode Active Disturbance Rejection Control for SIDO Buck Converter Based on High-Order Filtering Super-Twisting ESO

doi:10.16183/j.cnki.jsjtu.2024.043

Abstract

Abstract:

When a single-inductor dual-output (SIDO) Buck converter is disturbed by the load, a serious cross-coupling effect arises between branches, and the output signals are vulnerable to uncertain factors such as high-frequency measurement noise. To address the above issues, an improved sliding mode disturbance-observer-based control strategy based on a high-order filtering super-twisting extended state observer (HOFST-ESO) is proposed. First, the internal parameter influences and external disturbances are decoupled as lumped disturbances based on the mathematical model of the SIDO Buck converter to establish a disturbance-observer-based model without considering physical parameters. Next, a high-order filtering super-twisting extended state observer is designed to more accurately estimate and compensate for the lumped disturbances, enhancing the ability to suppress noise and cross-coupling effects. The stability of the observer is proven based on the finite-time stability theory. Then, an improved super-twisting sliding mode feedback control law is designed to ensure rapid convergence in both the sliding mode phase and the reaching phase, while better suppressing chattering. A Lyapunov function is constructed to analyze the stability of the feedback control law. Finally, the proposed control strategy is verified by simulations and experiments, which effectively reduces cross-coupling effects, suppresses noise, and improves the transient performance of the system.

Key words: extended state observer (ESO), active disturbance rejection control (ADRC), single-inductor dual-output (SIDO) Buck converter, Lyapunov function

CLC Number:

TM461

LI Conglin, HUANG Jinfeng, ZHANG Qian, CHEN Xu. Improved Sliding Mode Active Disturbance Rejection Control for SIDO Buck Converter Based on High-Order Filtering Super-Twisting ESO[J]. Journal of Shanghai Jiao Tong University, 2026, 60(1): 87-99.

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参数	取值
V_in/V	40
V_oa/V	15
V_ob/V	12
电容,C/μF	350
L/μH	33
R_a/Ω	15
R_b/Ω	12
开关频率,f_s/kHz	20

控制策略	主路参数	支路参数
PI	k_pa=30, k_ia=0.1	k_pb=10, k_ib=0.09
线性ADRC	k_pa=60	k_pb=60
	ω_ca=150	ω_ca=150
本文	ω_ca=500	ω_cb=385
	c_a=2 000	c_b=2 500
	λ_a=1 120,κ_a=3 600	λ_a=1 104,κ_a=3 600

扰动量	控制策略	最大超调量/V	最大调节时间/ ms	最大交叉影响/ (V·ms^-1)
a支路半载切换	PI	0.8	15	0.75/14
	线性ADRC	0.6	8	0.3/7
	本文	0.2	6	微小/微小
b支路半载切换	PI	0.8	18	0.6/13
	线性ADRC	0.6	10	0.3/7
	本文	0.2	6	微小/微小

支路	控制策略	最大超调量/V	最大调节时间/ms
a支路	PI	0.8	18
	线性ADRC	0.7	10
	本文	0.25	4
b支路	PI	0.8	18
	线性ADRC	0.3	7
	本文	0.1	2.4