Composite model-free adaptive control of a post-combustion CO2 capture system

doi:10.3969/j.issn.2097-0706.2024.09.001

Abstract

Abstract:

Post-combustion carbon capture （PCC） systems， as effective carbon reduction devices， are important for enhancing CO₂ capture efficiency and reducing energy consumption. To address control issues of PCC systems， a novel composite model-free adaptive control （MFAC）method is proposed，aiming for overcoming the reliance on precise models and the difficulties in adapting to varying parameters and uncertainties encountered by traditional methods. Composite MFAC integrates an extended state observer to estimate total system disturbances， improving systems' tracking and disturbance rejection capabilities. Comparative simulations on different control methods of PCC systems were conducted. In simulations for tracking CO₂ capture rate setpoints， composite MFAC demonstrated excellent tracking capability， whose acceleration time was only 95.69 s， which was 4.65 s faster than that of traditional MFAC and 78.02 s faster than that of PID control. In simulations for evaluating disturbance rejection performances， the composite MFAC exhibited the minimal deviation， smallest integral absolute error （IAE） and integral square error （ISE） among the three control methods， demonstrating a robust disturbance rejection capability. Simulation results validate the effectiveness and applicability of the proposed control approach.

Key words: post-combustion CO₂ capture, extended state observer, model-free adaptive control, control performance

CLC Number:

TK019：TP273

JIA Bingke, LI Zihao, WU Zhenlong, LIU Yanhong. Composite model-free adaptive control of a post-combustion CO₂ capture system[J]. Integrated Intelligent Energy, 2024, 46(9): 1-8.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Table 1

Parameters of different controllers

控制器	参数
PID	$k p = 14.25, k i = 0.5$
MFAC	$η = 0.35, μ = 1, ρ = 0.75, 0, 0 T, λ = 25$
MFAC-ESO	$η = 0.35, μ = 1, ρ = 0.75, 0, 0 T, λ = 25, b 0 = 0.000 3, ω o = 0.8, α = 55 000$

Table 1

Fig.4

Fig.5

Table 2

Fig.6

Fig.7

Table 3

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控制器	上升时间/s	IAE	ISE
PID	173.71	75 872.5	104 098.5
MFAC	100.34	66 446.3	108 219.1
MFAC-ESO	95.69	65 787.7	98 349.7

Composite model-free adaptive control of a post-combustion CO₂ capture system

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Figures/Tables 10

References 35

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控制器	IAE	ISE
PID	49 998.9	46 305.0
MFAC	37 945.4	24 829.7
MFAC-ESO	34 348.8	20 389.4

[1]	LI Pengzhen, JIA Bingke, LIU Yanhong, WU Zhenlong. Modified active disturbance rejection control on the post-combustion CO₂ capture system [J]. Integrated Intelligent Energy, 2023, 45(8): 18-25.
[2]	ZHANG Zhixiong;YANG Ping. Automatic generation control strategy based on control performance standard [J]. Huadian Technology, 2011, 33(3): 38-40.