Current Issue : July - September Volume : 2013 Issue Number : 3 Articles : 5 Articles
Electric propulsion systems are today widely applied in modern ships, including transport ships and warships.Theship of the future\r\nwill be fully electric, and not only its propulsion systembut also all the other services will depend on electric power.The robust and\r\nreliable operation of the ship�s power system is essential. In this work, a review on the mechanical and electrical faults of electric\r\nmachines that are used in electric ships is presented....
This paper presents aMATLAB/Simulink simulation of direct and indirect space vector modulation for matrix converter. Different\r\nswitching patterns for both direct and indirect methods are simulated and compared. Three criteria are chosen to compare the\r\nperformance of switching patterns: (1) total harmonic distortion (THD); (2) harmonic spectrum analysis of output voltages; and\r\n(3) number of switching in each switching period. Switching strategies are completely implemented using the power library in\r\nMATLAB/Simulink environment....
A parallel resonant quasi resonant converter is used for the speed control of a DC motor. The ZCS-QRC fed DC drive is modeled and simulated. It is found that the ZCS-QRC fed DC drive with fuzzy logic controller has several advantages than the PI closed loop control rather has several advantages than the conventional methods such as Phase controlled converters, DC choppers and PWM converters. This paper presents the analysis and simulation of a DC drive fed from zero current switching quasi-resonant converters (ZCS-QRC). The system is modeled such that the facilities of MATLAB can be extended to simulate DC machine, the analysis is done by circuit theory concepts and MOSFET- based parallel QRC fed DC drive systems are implemented in closed loop control by artificial intelligent technique such as Fuzzy logic controller....
A growing number of harmonic mitigation techniques are now available including active and passive methods, and the selection\r\nof the best-suited technique for a particular case can be a complicated decision-making process. The performance of some of these\r\ntechniques is largely dependent on system conditions, while others require extensive system analysis to prevent resonance problems\r\nand capacitor failure. A classification of the various available harmonic mitigation techniques is presented in this paper aimed\r\nat presenting a review of harmonic mitigation methods to researchers, designers, and engineers dealing with power distribution\r\nsystems....
Considerations are held about the specificationin which the PV plants have to fulfill so that they can be installed on marine vessels.\r\nInitially, a brief description of the typical electrical grid of ships is presented, distinguishing the main parts, reporting the typical\r\nelectrical magnitudes, and choosing the most preferable installation areas. The technical specifications,in which the PV plants\r\nhave to be compatible with, are fully described.They are determined by the special marine environmental conditions, taking into\r\nconsideration parameters like wind, humidity, shading, corrosion, and limited installation area. The work is carried out with the\r\npresentation of the most popular trends in the field of solar cell types and PV system technologies and their ability to keep up with\r\nthe aforementioned specifications....
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