This paper discusses about the detection and replacement of the switches in inverter under fault. The detection of switch is done through measuring the phase and line voltages of inverter. The replacement of the open switch is done through the extra arm provided in the circuit. The firing of the extra arm is done by detecting the open switch fault and interrupting the processor to provide the firing to the extra arm switch. This paper gives simple and effective detection and replacement of open switch. The replacement of switch will be done without stopping the whole system and saves the unspecified time. Simulation results are provided to demonstrate the detection and replacement.A feasible test is implemented by building a proto type threephase impedance source inverter, which is designed and controlled on the basis of proposed considerations. It is verified from the practical point of view that this new approach is more effective and acceptable to minimize the distortion.
In this study, a Sliding Mode (SM) methodology combined with a robust H∞ control scheme (SM-H∞) was proposed to control the stator active and reactive power generated by the Doubly Fed Induction Generator (DFIG). The purpose of the proposed controller is to improve the DFIG stator active and reactive power tracking performances by reducing chattering phenomena under variable wind speed, which provides major drawbacks of conventional SM controllers. The H∞ technique was used to define the SM attractive control part, which helps to reduce chattering phenomena and improves robustness in the presence of parameter variations and wind speed changing. The DFIG stator was directly connected to the grid and, its rotor was linked to the grid through a back-to-back converter. The proposed approach was tested using Matlab/Simulink and a comparison with the conventional SM and the SM fuzzy logic controllers was carried out. The results of simulation illustrated an effectiveness of the proposed SM-H∞ controller even in the presence of the DFIG parameter variations and speed changing compared with the other techniques.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.