Abstract
In this paper, a novel active control approach is designed for surge instability in the compressor system using the finite-time fuzzy sliding mode scheme. The primary novelty of this study lies in the development of a finite-time fuzzy sliding mode control for the surge instability in a compressor system in the presence of disturbance and uncertainty in the characteristic curve of the compressor and also throttle valve. To ensure the stability of the closed-loop system in Lyapunov's concept, a finite time active control method is proposed based on fuzzy estimation method and robust adaptive and sliding mode methods. Achieving finite time stability and rapid elimination of deep surge instability occurs through a fast sliding mode design, while fuzzy and adaptive techniques are used to estimate uncertainty and nonlinear terms, as well as to obtain optimal estimation weights. The simulation results in MATLAB environment and comparison show that the suggested method provides better quality control in terms of surge suppression, robustness, and overcoming uncertainty and disturbance effects.
Highlights
Compressors are broadly used in various industries such as oil and gas, petrochemicals, and used to increase the pressure or transfer of compressible liquids
The most important innovation of this paper is to present a finite time fuzzy sliding mode control method with the assumption that the opening percentage of the throttle valve is unknown and there is an uncertainty on the compressor characteristic curve, while the disturbance enters both states of the system, and the actuator used in the compressor system is close-coupled valve (CCV)
To show the robustness and efficiency of the proposed method, the Greitzer model is simulated in MATLAB environment, and the results are compared with robust adaptive fuzzy backstepping (RAFB) and feedback control methods [42,43]
Summary
Compressors are broadly used in various industries such as oil and gas, petrochemicals, and used to increase the pressure or transfer of compressible liquids In many of these applications, compressor failure can cause upstream and downstream equipment failure, so much effort is being put into their stable and optimal performance [1–5]. Due to the efficiency as well as the range of penetration and the presence of CCV in most industrial compressor systems, this actuator is the most common means for active control of surge, and in this study, it is considered to apply a control signal. Due to the widespread use of robust control methods in various applications [28–33], this paper presents a finite-time robust nonlinear method for controlling the surge instability of a compressor system using a CCV actuator. The simulations are carried out, and in the fifth part, the conclusion of the paper is given
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