Intelligent fault diagnosis for dynamic systems via extended state observer and soft computing

2021 ◽  
pp. 181-206
Author(s):  
Paul P. Lin
Keyword(s):  
Fault Diagnosis ◽  
Soft Computing ◽  
Dynamic Systems ◽  
State Observer ◽  
Extended State Observer ◽  
Extended State ◽  
Intelligent Fault Diagnosis

scholarly journals The Diagnostic Method for Open-Circuit Faults in Inverters Based on Extended State Observer

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Chaobo Chen ◽  
Ying Yang ◽  
Binbin Zhang ◽  
Song Gao
Keyword(s):  
Fault Diagnosis ◽  
Dynamic Model ◽  
State Observer ◽  
Open Circuit ◽  
Extended State Observer ◽  
Extended State ◽  
Diagnosis Rate ◽  
Circuit Fault Diagnosis ◽  
Unknown Disturbance ◽  
Motor Drive System

To reduce the influence of unknown disturbance on open-circuit fault diagnosis of inverters in the motor drive system, an open-circuit fault diagnosis method, which is based on extended state observer, is proposed for inverters. A mixed logic dynamic model of the inverters is established by analyzing the current flow path when the system works normally and there are open-circuit faults. A voltage extended state observer is designed for the mixed logic dynamic model. The open-circuit faults are detected according to the phase voltage residual between the observed voltage and the actual voltage. The position of the faulty switches is determined by querying the voltage residual information table. Finally, the simulation results show that the method can effectively reduce the influence of the unknown interference on the inverter faults diagnosis, improve the fault diagnosis rate, and verify the effectiveness and feasibility of the method.

scholarly journals Fault-tolerant control for a class of n-order systems based on fast terminal sliding mode and extended state observer

2021 ◽  
pp. 002029402110286
Author(s):  
Pu Yang ◽  
Peng Liu ◽  
ChenWan Wen ◽  
Huilin Geng
Keyword(s):  
Fault Tolerant ◽  
Sliding Mode ◽  
Singular Control ◽  
Fault Tolerant Control ◽  
State Observer ◽  
Extended State Observer ◽  
Extended State ◽  
Terminal Sliding Mode ◽  
Fast Terminal Sliding Mode ◽  
Terminal Sliding Surface

This paper focuses on fast terminal sliding mode fault-tolerant control for a class of n-order nonlinear systems. Firstly, when the actuator fault occurs, the extended state observer (ESO) is used to estimate the lumped uncertainty and its derivative of the system, so that the fault boundary is not needed to know. The convergence of ESO is proved theoretically. Secondly, a new type of fast terminal sliding surface is designed to achieve global fast convergence, non-singular control law and chattering reduction, and the Lyapunov stability criterion is used to prove that the system states converge to the origin of the sliding mode surface in finite time, which ensures the stability of the closed-loop system. Finally, the effectiveness and superiority of the proposed algorithm are verified by two simulation experiments of different order systems.

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