Abstract
Schematic and algorithmic solutions for the design and construction of ship’s electromotive systems of various purposes are considered. The analysis of the existing structures of electromotive complexes, as well as the types of electrical converters used is carried out. The structure of an electromotive complex based on a transformerless structure with common DC bus-bars is proposed. The main goals of improvement are to increase energy efficiency, reliability and survivability of an electric power plant, and lower weight and size characteristics. The proposed structure of the ship’s electromotive complex allows braking the propellers without using additional braking circuits with the redistribution of energy between the propeller electric machines and the dissipation of braking energy in the working medium - water. An algorithm is proposed and mathematical modeling of braking and reverse modes of a propeller electric installation is carried out. Timing diagrams of changes in torque, rotation speed and power on each of the propellers for the proposed algorithm of braking and reverse of propeller motors are presented. It is shown that the synthesized structure of the electromotive complex makes it possible to reduce the emissions of pollutants into the environment, as well as to save fuel within the range of 10÷15%, depending on the operating modes of the ship in comparison with the existing structures of the electromotive systems.
Highlights
The construction of a number of unique ships and vessels continues in Russia [1, 2]
Two-link frequency converters based on two-level or three-level voltage inverters are used as electrical converters
An important factor is the high environmental compatibility and a small amount of polluting emissions into the environment of such a power plant due to the fact that the primary heat engines operate in an optimal mode, and the voltage inverters are able to redistribute energy flows among themselves, optimizing the energy consumption criterion
Summary
The construction of a number of unique ships and vessels continues in Russia [1, 2]. Analysis of sources [2,3,4,5] shows that in practice various variations of the structures of electromotive systems are used, almost all projects of electromotive systems of domestic and foreign production have a sequential structure: generator – switchgear – matching transformer – two-link frequency converter and propeller motor. To match the voltage levels of the generator set and the propeller motor, matching transformers installed in the electric power channel and designed for the full power of the connected electrical converter are used.
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