Structure and control method of a hybrid ship with dual diesel generator sets and lithium batteries

Abstract

The invention discloses a double-diesel generating set and lithium battery hybrid power ship structure which comprises an electric propulsion system. The electric propulsion system comprises two diesel generating sets, a lithium battery pack and an electric motor, wherein the two diesel generating sets, the lithium battery pack and the electric motor are connected with a direct-current bus, the electric motor is also connected with a propeller, the direct-current bus is also connected with shore power, and a power controller receives power signals of the electric motor and electrical charge status signals of the lithium battery pack and sends power control signals to the two diesel generating sets and a DC / DC convertor. The invention further provides a control method of the double-diesel generating set and lithium battery hybrid power ship electric propulsion system. The structure and the method have the advantages that system configuration is optimized, and the capacity of the lithium battery pack is reduced under the condition of guaranteeing that a ship normally sails; under sail, a charging stage and a discharging stage of the lithium battery pack are divided, so that the lithium battery pack is protected and battery electrical charge status estimation is facilitated; it can be guaranteed that after being started, two diesels are located at the best exhaust and fuel efficiency working points all the time, and electric energy utilization efficiency of the diesel generating sets can be improved.

Description

technical field [0001] The invention relates to the technical field of hybrid ships, in particular to a structure and control method of a dual diesel generator set and lithium battery hybrid ship. Background technique [0002] The electric propulsion system is an advanced ship propulsion method. This propulsion method can improve the technical and economic performance of the ship. It has the characteristics of good maneuverability, reduced ship waste emissions, and reduced ship fuel energy consumption. Good dynamic characteristics. Chinese patent document CN201010300192.X discloses an electric propulsion ship with a diesel generator set as the main power source, which can only reduce but not completely eliminate the exhaust gas emission of the ship. Chinese patent document CN200820155772.2 discloses an electric propulsion ship with a supercapacitor bank and a battery stack as a power source. Once the energy storage of the supercapacitor bank and battery is used up or fails,...

AI Technical Summary

Problems solved by technology

Chinese patent document CN201010300192.X discloses an electric propulsion ship with a diesel generator set as the main power source, which can only reduce but not completely eliminate the exhaust emissions of the ship

Chinese patent document CN200820155772.2 discloses an electric propulsion ship with a supercapacitor bank and a battery stack as a power source. Once the energy storage of the supercapacitor bank and battery is used up or fails, the ship will lose power during navigation. , causing serious ship navigation safety accidents

Although the configuration of one diesel generator set can make the diesel engine run in the best working condition to reduce emissions and reduce fuel consumption, its utilization efficiency of the electric energy generated by the diesel generator set is not high during the voyage.

At the same time, in order to ensure the safety of the ship's navigation and zero exhaust, the zero-emission working method lasts for a long time, the implementation method of a diesel generator set limits the further optimization of its system configuration, causing redundancy and increasing costs

Images