Abstract
In recent years, semiconductor converters are widely applied in marine electric power systems. Semiconductor converters are used in ship electric propulsion systems consisting of shaft generator units, a variable frequency drive, and alternators. The use of semiconductor converters results in decrease of power quality in ship networks, in particular, in an increased ratio of non-sinusoidal voltage waveforms (harmonic distortion). Rules of the Russian Maritime Register govern the maximum allowable distortion in the power network for a correct functioning of ship equipment. Improvement of power quality is achieved with a variety of methods including application of filter-compensating devices, three-winding transformers, and electromachine converters. The paper analyzes a single marine power system and circuit solutions for reducing the ratio of harmonics in ship networks.
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