Instability and a reduction in control performance are mostly caused by faults and failures in components of the system. In order to increase the control system's tolerance against faults and failures, fault-tolerant control (FTC) techniques have been developed recently. This thesis investigates an active FTC for rigid spacecraft attitude control subject to transducer faults, parameter uncertainty and external disturbance. The designed fault detection observer is capable of detecting the transducer fault without false alarms brought on by outside disturbances, model uncertainties, and the designed fault estimation is to estimate the overall effects of the fault and system states. Introduces an auxiliary variable that uses an indirect fault identification approach in order to estimate accurately and reduce the effect of faults or failures.

Abstract

Wind energy is a none convectional energy source that is now the subject of much research. Variable wind turbines are the most widely used type of wind turbine system because they are the most effective and provide more control across a broad speed variety. Wind behavior determines the manner in which a wind turbine converts energy. The main advantage of renewable energy is to avoid air pollution and to maximize society use of energy. Wind energy and wind speed controller very important to improve energy performance by using fuzzy logic based adaptive controller. Pitch angle control phenomenon assists in optimizing at lower wind speeds and stabilizing output power at higher wind speeds. It also assists in running the system with greater efficiency and dependability under turbulent weather situations or temperature change of high flow air.