When a fault is detected, the fault tolerant control starts to compensate the fault effect.
Using the information of estimation, an observer-based fault tolerant controller is designed to compensate the fault effect and guarantee the stability of closed-loop system.
The second stage is represented by the reconfiguration mechanism which make possible to compensate the fault effects.
However, in the fault case 3, a HOM (i,j) equal to −12 dB (i.e., the minimum allowed value) is needed to successfully compensate the fault.
The control objective is to use the output PDFs to design control schemes that can compensate the fault and attenuate the disturbance.
Based on the estimation, a group of model predictive controllers are designed to compensate the fault effects for each component of the wind turbine.
It can be seen that this approach does not achieve any improvement in the SINR of the faulty cell so that it is not an alternative to compensate the fault.
Then, a class of distributed state feedback controllers is constructed to automatically compensate the fault and perturbation effects, and reject the disturbances simultaneously based on the information from adaptive schemes.
The study confirms that the de-centralized approach to faulttolerant control of NCS suffers from a difficult challenge as to how to compensate for fault effects occurring throughout the NCS.
The problem of active fault tolerant control (FTC) of dynamical systems involves the process of fault detection and isolation/fault estimation (FDI/FE) used to either make a decision as to when and how to change the control, based on FDI or to compensate the fault in the control system via FE.
To achieve fault tolerance for a hierarchical control architecture, a combination of both options appears to be advisable: on each individual level of the hierarchy, the controller may compensate the fault as far as possible, and then pass on responsibility to the next upper level.
