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Abstract

Combined propulsion plants get wide spread on modern ships of foreign construction, while in the domestic shipbuilding industry there is practically no experience in the design and testing of these vessels. A distinctive feature of the combined propulsion plants is that the energy for the vessel movement is generated in them in two (or more) different types of ship engines - thermal and electric, working on a common propulsion unit - a propeller. Combined propulsion plants are complex electromechanical systems designed to ensure the movement of the vessel and the production of electricity in the various modes of operation. Combined propulsion plants conjoin the advantages of traditional propulsion systems with heat main engines and electric propulsion plants. A unified electric power system with a combined plant of a work boat is discussed in the paper. The work boat is the first vessel built in the Russian Federation with this type of propulsion system. The feature the combined propulsion plant installed on the work boat is the ability to operate the propeller electric motor in both propulsion and generator modes. The ship uses diesel generators, storage batteries and electric propulsion motor in the generator mode as the sources of electricity. The main modes of the vessel operation, the results of dock and sea trials of the unified electric power system and combined propulsion plant are briefly discussed in the paper. During the trials, the autonomous mode of operation of each electric power source on the auxiliary electric propulsion plant and ship consumers has been checked successfully. New method of synchronization of diesel-generator and autonomous inverter has been realized; it has high speed and accuracy that excludes appearance of current shot when power source connects to the main switchboard.