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Application of New Type Transformer in Ship Electric Propulsion System

Author: ShiJianFeng
Tutor: LuoLongFu
School: Hunan University
Course: Electrical Engineering
Keywords: Electric propulsion Propulsion transformers Harmonic suppression Ship Power
CLC: U665.13
Type: Master's thesis
Year: 2009
Downloads: 171
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Abstract


With the progress of power electronic devices and the AC motor speed control technology, marine electric propulsion ushered in a new era of booming. Power electronics technology has also brought in a large number of applications of the ship harmonic problems, and have become increasingly prominent and serious. Hunan University, transmission and distribution of electric propulsion the ship grid harmonic problem, and has the harmonic suppression methods carried out on the basis of analysis and summary, relying research and development of new technology platforms, combined with the new commutation of Hunan Province, a major science and technology projects HVDC the transformer developed \Main work of this paper include the following: Introduction ship electric propulsion overview, prospects and application of technology development at home and abroad, \it is necessary to explore new ways of filtering. Electric propulsion ship power grid harmonics generated and the harm caused by the ship power grid commonly used three-phase full-controlled bridge circuit and is widely used Synchro electric propulsion system harmonic analysis. Finally, the the traditional ship power harmonic suppression. New propulsion transformer theory analysis of the new propulsion transformer and its filter system with harmonic shielding, the technical characteristics of the the autotransformer role and reactive power compensation. With traditional ship filtering system contrast, describes specific technical performance of the new propulsion transformers. The overall design of the classic model and a new model of ship power system simulation tool MATLAB / Simulink simulation compared simulation results demonstrate the superiority of the proposed implementation of the filtering scheme based on the structure of the new propulsion transformers. In Marine Electric Propulsion application background in the system for new propulsion transformers, and distinguish between inrush current and internal fault current of transformer differential protection over the years there has been problems, new propulsion transformer action equation is derived based transformer model proposed The corresponding protection criteria. Simulation results show the new protection principle essentially get rid of the influence of magnetizing inrush current, reliable identification advancing the transformer internal failure to solve the historical problems in the transformer primary protection - distinguish inrush current.

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CLC: > Transportation > Waterway transport > Marine Engineering > Electrical installations in ships,observation, communication equipment > Marine power installations > Electric drive, promote,automatic control
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