Stabilization of Second-Order Non-Minimum Phase System With Delay via PI Controllers: Spectral Abscissa Optimization

This paper addresses the stabilization of a general class of linear single-input/single-output (SISO) second-order non-minimum phase systems with input channel delays using Proportional-Integral (PI) controllers. Such systems arise in various applications, including power electronic circuits and bio...

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Bibliographic Details
Published in:IEEE access 2024, Vol.12, p.170851-170867
Main Authors: Torres-Garcia, Diego, Mendez-Barrios, Cesar-Fernando, Niculescu, Silviu-Iulian
Format: Article
Language:English
Subjects:
Aerospace electronics
Closed loop systems
Closed loops
Computer Science
Controllers
Decay rate
Delays
Electronic circuits
Feedback control
Fragility
Linear systems
Low-pass filters
Mathematics
non-minimum phase
Numerical stability
Optimal control
Optimization
PI control
Proportional integral
quasi-polynomials
Robustness
SISO (control systems)
spectral abscissa
Stability criteria
Stabilization
Systems and Control
time-delay
Voltage converters (DC to DC)
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Summary:This paper addresses the stabilization of a general class of linear single-input/single-output (SISO) second-order non-minimum phase systems with input channel delays using Proportional-Integral (PI) controllers. Such systems arise in various applications, including power electronic circuits and biochemical reactors. The primary goal is to enhance system performance by determining optimal control gains that shift the spectral abscissa of the closed-loop system as far to the left as possible, thereby improving its decay rate. To achieve this, we introduce a geometric framework that characterizes the stability region of the closed-loop system in three distinct cases. Our main contribution is a systematic tuning approach to achieve the desired decay rate when feasible. Additionally, we discuss the controller's fragility and the delay margin of the closed-loop system to ensure practical applicability. The effectiveness of the proposed method is demonstrated through numerical simulations for each scenario. Finally, two practical case studies-a boiler steam drum and a DC-DC boost converter-are presented to illustrate the results' relevance in practice.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2024.3499748