Unknown Input Fault Detection and Isolation Observer Design for Neutral Systems

2016 ◽  
Vol 18 (5) ◽  
pp. 1825-1835 ◽  
Author(s):  
Aicha Elhsoumi ◽  
Saloua Bel Hadj Ali ◽  
Rafika El Harabi ◽  
Mohamed Naceur Abdelkrim
Keyword(s):  
Fault Detection ◽  
Observer Design ◽  
Fault Detection And Isolation ◽  
Unknown Input ◽  
Neutral Systems

Fault Detection and Isolation in Power Systems Using Unknown Input Observer

2019 ◽  
pp. 38-58 ◽  
Author(s):  
Hassan Haes Alhelou
Keyword(s):  
Fault Detection ◽  
Power Systems ◽  
Frequency Control ◽  
Load Frequency Control ◽  
Fault Detection And Isolation ◽  
Unknown Input ◽  
Unknown Input Observer ◽  
Control Loops ◽  
Interconnected Power Systems ◽  
Unknown Disturbance

Unknown input observers (UIO) find application in many cases for successful fault detection and isolation (FDI). In this chapter, a scenario where the unknown input observer is applied to load frequency control loops in interconnected power systems is analyzed. A UIO was chosen because load demand is not always constant and it can be considered to introduce an unknown disturbance to the system. Mathematical formulations on how to detect and isolate sensor faults are presented which are then implemented in MATLAB Simulink for simulations. Based on this historical survey on the application of UIO, a thesis on UIO application in FDI in distributed generation is done.

Review of Optimal Solutions to the Robustness Problem in Observer-Based Fault Detection

1993 ◽  
Vol 207 (2) ◽  
pp. 105-112 ◽  
Author(s):  
P M Frank ◽  
B Koppen
Keyword(s):  
Fault Detection ◽  
General Solution ◽  
Frequency Domain ◽  
Time Domain ◽  
Fault Detection And Isolation ◽  
Unknown Input ◽  
Optimal Solutions ◽  
Unified Approach ◽  
Ultimate Objective ◽  
The Time Domain

The paper presents a unified approach and general solution of the robustness problem in fault detection and isolation concepts. The ultimate objective is the design of an unknown input fault-detection observer providing a perfect decoupling between unknown inputs and faults. If this is not possible because certain prerequisites are not fulfilled, two optimal compromises in the time domain and in the frequency domain are described. The basic definitions concerning robustness and unknown input fault detectability are given, and the design techniques for the proposed approaches are outlined. The cross-connections to other methods are discussed and a practical example is given.

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