Energy management method of marine DC hybrid power system

Abstract

The invention relates to the technical field of energy management, in particular to an energy management technology aiming at a marine direct current hybrid power system, and particularly relates to an energy management method aiming at the marine direct current hybrid power system composed of multiple groups of fuel cells, multiple groups of lithium batteries and a super capacitor. By monitoring information such as bus voltage and residual electric quantity of each power supply, each power supply DC/DC converter in the marine direct-current hybrid power system is controlled, so that the hybrid power system is switched among 11 working modes, flow of energy in the hybrid power supply is timely allocated, the stability of the direct-current bus is ensured, and the service life of the hybrid power supply is prolonged. The hybrid power supply system rapidly tracks load changes, and stable and reliable operation of the whole DC hybrid power system is realized.

Description

technical field [0001] The present invention relates to the technical field of energy management, in particular to the energy management technology of a marine DC hybrid power system, specifically an energy management method for a marine DC hybrid power system composed of multiple sets of fuel cells, lithium batteries, and supercapacitors . Background technique [0002] Compared with hybrid electric vehicles, all-electric DC ships contain multiple energy sources, and the number of each energy source may be more than one. Fuel cells have the advantages of high energy density, cleanliness, and high energy conversion rate, and are widely used. However, a power generation system composed solely of fuel cells does not have good load-following characteristics, so energy storage equipment needs to be introduced. Lithium batteries are widely used in energy storage devices. Their energy density is relatively high, but their power density is relatively small. When the load power cha...

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Problems solved by technology

[0003] In the prior art, there are many studies on energy management methods for hybrid power systems of fuel cells and single energy storage devices, such as fuel cells and supercapacitors, or hybrid power systems composed of fuel cells and lithium batteries, but there is a lack of research on energy management methods that include both Research on energy management methods of DC hybrid power systems with fuel cells, lithium batteries and supercapacitors, especially for marine DC hybrid power systems composed of multiple fuel cells, lithium batteries and supercapacitors in parallel. is almost no

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