The Study On Marine Power System Harmonic Energy Extraction

In recent years, the harmonic pollution is becoming more and more serious, which directly influences the safety and economy of the operation of the ship. It is an urgent problem need to control the harmonic of the ship power grid effectively. The traditional harmonic suppression scheme is filtered through the filter device.But the harmonic energy itself is a kind of energy. In order to respond to the national power departments of the “green power”, the harmonic power should be extracted, rather than as “junk”to dispose of them. So the main work of the paper is to study the harmonic energy extraction of the ship grid power.First of all, the article analyzes the present status of ship power system harmonic, harmonic source and the harm of the main power of the ship. Analysis of the electric propulsion ships 6 pulse inverter harmonic characteristics, modeling and MATLAB simulation, the simulation results show that 5 times, 7 times of the harmonic content is rich, has the extraction use value.Secondly, analysis of fundamental wave magnetic flux compensation principle, designs based on the fundamental wave magnetic flux compensation fundamental wave degaussing apparatus. The device by controlling the injection series transformer secondary side of the fundamental wave current, the fundamental wave in the transformer core main magnetic flux is zero, and the series transformer is short to the fundamental wave and the harmonic approximation is open. Combining tuning technology, in the extraction of harmonic energy, fundamental degaussing equipment can not only play a role in harmonic isolation, forced a large number of harmonics into the passive filter branch, and can be eliminated to extract harmonic energy contained in the fundamental component.Finally, the extraction in ship power grid harmonic energy simulation model is established based on MATLAB7.3, through the simulation data analysis the extraction of the harmonic, verify the feasibility of the harmonic power extraction that the proposed fundamental wave degaussing apparatus union tuning technology...