scholarly journals ON THE EXTREMUM-SEEKING CONTROL DESIGN AND APPLICATION FOR ANAEROBIC DIGESTION PROCESSES

2019 ◽  
pp. 23-28
Author(s):  
Maobo Hu ◽  
Haoping Wang ◽  
Yang Tian ◽  
Nicolai Christov ◽  
Ivan Simeonov
Keyword(s):  
Steady State ◽  
Anaerobic Digestion ◽  
Extremum Seeking ◽  
System Model ◽  
Extend Kalman Filter ◽  
Order Model ◽  
Extremum Seeking Control ◽  
Digestion Process ◽  
Steady State Oscillation ◽  
Fifth Order

The paper deals with the optimization of nonlinear systems by using Extremum Seeking Control (ESC) without any prior knowledge of the system model. An Extend Kalman Filter based Extremum Seeking Control (EKF based ESC) is proposed, which can make the amplitude of perturbation signal variable and ensure convergence to zero, i.e. without steady-state oscillation. The proposed ESC algorithm makes also possible to obtain more accurate gradient estimate and more rapid ESC convergence. The proposed EKF based ESC algorithm is applied to a fifth-order model of anaerobic digestion process and its performances are compared with the performances of the classical ESC algorithm. Key Words: ESC, EKF, steady state oscillation, anaerobic digestion processes

scholarly journals Kalman Filter based Newton Extremum Seeking Control for Maximum Gases Production Rates of Anaerobic Digestion Process

2020 ◽  
Vol 49 (4) ◽  
pp. 455-463
Author(s):  
Haoping Wang ◽  
Maobo Hu ◽  
Yang Tian ◽  
Ivan Simeonov ◽  
Lyudmila Kabaivanova ◽  
...  
Keyword(s):  
Kalman Filter ◽  
Anaerobic Digestion ◽  
Extremum Seeking ◽  
Production Rates ◽  
Extremum Seeking Control ◽  
Filtering Algorithm ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Input And Output ◽  
Hessian Estimates

This paper proposes a Kalman filter (KF) based Newton extremum seeking control (NESC) to maximize production rates of hydrogen and methane in anaerobic digestion process. The Kalman filtering algorithm is used to obtain more accurate gradient and Hessian estimates which makes possible to increase the convergence speed to the extremum and to eliminate input and output steady-state oscillations. The simulation examples demonstrate the performances of the proposed approach.

A novel speed optimisation scheme for unmanned sailboats by sliding mode extremum seeking control without steady-state oscillation

2021 ◽  
pp. 1-18
Author(s):  
Zhipeng Shen ◽  
Xuechun Fan ◽  
Haomiao Yu ◽  
Chen Guo ◽  
Saisai Wang
Keyword(s):  
Steady State ◽  
Sliding Mode ◽  
Small Deviation ◽  
Extremum Seeking ◽  
Piecewise Constant Function ◽  
Maximum Speed ◽  
Extremum Seeking Control ◽  
Switching Law ◽  
Steady State Oscillation ◽  
Search Control

Abstract This paper proposes a novel speed optimisation scheme for unmanned sailboats by sliding mode extremum seeking control (SMESC) without steady-state oscillation. In the sailing speed optimisation scheme, an initial sail angle of attack is first computed by a piecewise constant function in the feed forward block, which ensures a small deviation between sailing speed and the maximum speed. Second, the sailing speed approaches to maximum gradually by extremum search control (ESC) in the feedback block. In SMESC without steady-state oscillation, a switching law is designed to carry out the control transformation, so that the speed optimisation system carries out SMESC in the first convergence phase and ESC without steady-state oscillation in the second stability phase. This scheme combines the advantages of both control algorithms to maintain a faster convergence rate and to eliminate steady-state oscillation. Furthermore, the strict stability of the speed optimisation system is proved in this paper. Finally, we test a 12-m mathematical model of an unmanned sailboat in the simulation to demonstrate the effectiveness and robustness of this speed optimisation scheme.

Twisting sliding mode extremum seeking control without steady-state oscillation

2019 ◽  
pp. 1-11
Author(s):  
Zongru He ◽  
Songlin Chen ◽  
Zhengyi Sun ◽  
Libin Wang ◽  
Kemao Ma
Keyword(s):  
Steady State ◽  
Sliding Mode ◽  
Extremum Seeking ◽  
Extremum Seeking Control ◽  
Steady State Oscillation

An UKF-based Extremum Seeking Control of Two-Stage Anaerobic Digestion Process

2021 ◽  
Author(s):  
Dandan Xu ◽  
Haoping Wang ◽  
Yang Tian ◽  
Nicolai Christov ◽  
Lyudmila Kabaivanova ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Extremum Seeking ◽  
Two Stage ◽  
Extremum Seeking Control ◽  
Anaerobic Digestion Process ◽  
Digestion Process
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