In order to eliminate the influence of unpredicted faults, an active fault-tolerant supervisory control strategy is further constructed by synthesizing fault detection, isolation, estimation and compensation.
In the context of chemical process plants, these tasks can be categorised as data acquisition, regulatory control, data reconciliation, process monitoring, fault diagnosis, supervisory control scheduling and planning.
Using these two indices as a combined supervisory logic, three-phase fault in the third zone can be rapidly and reliably detected and discriminated from system stressed conditions, and thus avoid false operation of distance relay during stressed system conditions.
This information would be extremely useful for the design of the derived operational procedures such as supervisory controllers on all levels and fault detection and fault isolation schemes.
Professor Venkat and his group have been exploring various approaches for the integration of process monitoring, data reconciliation, fault diagnosis, and supervisory control tasks into a single unified real-time framework.
This framework is very useful in the analysis and design of control systems and can also be used in the analysis and design of supervisory systems (which must include fault detection capabilities).
These factors are the absence of data quality assurance mechanisms in practice with little attention paid to this issue even in policy (14, 31, 32), infrequent supervisory support that might correct faults and weaknesses in the HMIS departments (33), and organizational barriers to registration of events.
This work considers the problem of fault-tolerant control of nonlinear processes with input constraints subject to control system/actuator failures, and presents and demonstrates an approach to fault-tolerant control predicated upon the idea of integrating fault-detection, feedback and supervisory control.
Calibrated energy models can be used for several specific tasks in the operation phase, in particular condition monitoring, fault detection and diagnosis, supervisory control and energy management.
Tolerance to internal faults requires the integration of additional control sub-systems, including a fault detection algorithm and a supervisory algorithm to reconfigure control on occurrence of a fault.
