scholarly journals Determining Redundancy Requirements for a Fault Tolerant Control System

1989 ◽  
Author(s):  
Paul A. Lockner ◽  
Paul D. Hancock
Keyword(s):  
Control System ◽  
Control Systems ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Repair Rate ◽  
System Availability ◽  
Rate Information ◽  
Output Stages

The key element in all fault tolerant controls is redundancy [1], but it can be difficult to determine how much redundancy is necessary to achieve the desired level of control system availability. Through examples, this paper examines reliability effects of various elements used in real turbo control systems, including the input sensors, control channels and output stages. The paper then shows that with module reliability and repair rate information, we can determine the redundancy necessary to achieve the desired level of control system availability.

scholarly journals A Survey on Active Fault-Tolerant Control Systems

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1513
Author(s):  
Alireza Abbaspour ◽  
Sohrab Mokhtari ◽  
Arman Sargolzaei ◽  
Kang K. Yen
Keyword(s):  
Control System ◽  
Fault Detection ◽  
Control Systems ◽  
Active Fault ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Fault Detection And Isolation ◽  
Control Performance ◽  
System Components ◽  
Active Fault Tolerant Control

Faults and failures in the system components are two main reasons for the instability and the degradation in control performance. In recent decades, fault-tolerant control (FTC) approaches have been introduced to improve the resiliency of control systems against faults and failures. In general, FTC techniques are classified into active and passive approaches. This paper reviews fault and failure causes in control systems and discusses the latest solutions that are introduced to make the control system resilient.The recent achievements in fault detection and isolation (FDI) approaches and active FTC designs are investigated. Furthermore, a thorough comparison of several different aspects is conducted to understand the advantage and disadvantages of various FTC techniques to motivate researchers to further developing FTC and FDI approaches.

scholarly journals Active Fault Tolerant Control System for the Measurement Circuit in a Drum Boiler Feed-Water Control System

2018 ◽  
Vol 51 (1-2) ◽  
pp. 4-15 ◽  
Author(s):  
Mariusz Pawlak
Keyword(s):  
Control System ◽  
Water Level ◽  
Control Systems ◽  
Power Unit ◽  
Fault Tolerant ◽  
Diagnostic System ◽  
Fault Tolerant Control ◽  
Level Control ◽  
Level Control System ◽  
Boiler Drum

This paper presents a water-level control system in a drum boiler. The system was equipped with a fault tolerant control–type diagnostic system. The paper presents the results of tests conducted on the fault tolerant control system implemented in the water-level control system in a boiler drum. The diagnostics of the measurement circuits was carried out online. To that end, the appropriate partial models were developed and tested. This allowed for the application of analytical redundancy for the measurement circuits. The paper also identifies the influence of diagnostics and fault tolerance on the values of reliability indices and operating safety of a power unit. Fault tolerant control systems increase the safety of a power unit operation, and the studies described in the paper directly contribute to them. These kinds of systems have not been used so far in power unit automation. Site tests confirmed the validity of the acquired concept for the diagnostic system. Fault tolerant control systems have not been commonly applied in power engineering yet. Studies of the water-level control system in a steam drum using the fault tolerant control system for the measurement circuits as presented in the paper are original ideas, providing a new solution. All control systems made for the study fulfil their role in a satisfactory way, which results in a minor deviation in the water-level adjustment in the boiler drum. The tests confirmed the efficiency of the fault detection algorithm. The created models of the water level and flows proved to be successful. Under a no-fault condition of the facility, there were no errors in the diagnoses and the values of all residua were below the detection thresholds. This was achieved despite a high value of measurement noises. The residua helped detect minor faults.

scholarly journals AIRCRAFT CONTROL LAW RECONFIGURATION

Aviation ◽  
2015 ◽  
Vol 19 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Vladislav Kosyanchuk ◽  
Nikolay Selvesyuk ◽  
Alexey Kulchak
Keyword(s):  
Control System ◽  
Control Systems ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Analytical Form ◽  
Control Law ◽  
Aircraft Control ◽  
Stationary Object ◽  
Medium Range ◽  
Control Failures

The synthesis of MIMO fault-tolerant control systems under control failures is considered. The solution is written in an analytical form, which makes it possible to synthesize simplified circuit implementations and adjust coefficients of the fault-tolerant control system in the case of a non-stationary object. А nonlinear medium-range aircraft model was used to verify the results.

scholarly journals A review on control and fault-tolerant control systems of AC/DC microgrids

Heliyon ◽  
2020 ◽  
Vol 6 (8) ◽  
pp. e04799
Author(s):  
Leony Ortiz ◽  
Jorge W. González ◽  
Luis B. Gutierrez ◽  
Orestes Llanes-Santiago
Keyword(s):  
Control Systems ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Dc Microgrids
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