Energy management system and method for marine composite energy storage unit

Abstract

The invention discloses an energy management system for a marine composite energy storage unit. A first current-voltage sampling module collects current and voltage of a load motor; the sampling data output end of the first current-voltage sampling module is connected with a first data input end of a PI regulator; a second current-voltage sampling module collects current and voltage of a generator set; the sampling data output end of the second current-voltage sampling module is connected with a second data input end of the proportional integral regulator; the output end of the proportional integral regulator is connected with a feed signal input end of a digital signal processing control module; the digital signal processing control module is connected with the control ends of a first DC/DC converter and a second DC/DC converter separately; the power supply output end of the generator set is connected with a direct current bus through a rectifier; the load motor is connected with the direct current bus through a bidirectional inverter; and the digital signal processing control module is connected with the control signal input end of the bidirectional inverter. According to the energy management system, the optimal energy efficiency state of the working state of the generator set can be achieved.

Description

technical field [0001] The invention relates to the technical field of electric propulsion ship energy storage systems, in particular to an energy management system and method for a marine composite energy storage unit. Background technique [0002] With the continuous development of social economy, energy crisis and air pollution have become the main problems of today's social development. Although electric propulsion ships have certain advantages over traditional propulsion ships in terms of economy and exhaust emissions, there is still a lot of room for improvement. A large number of power electronic devices are used in electric propulsion ships, and a large number of harmonics generated by them will reduce the power quality of the ship's power grid, thus making the ship work in an unstable state. This not only prevents the generator set from working well in an ideal economic state, but also reduces the safety of the ship. [0003] The use of energy storage technology o...

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Problems solved by technology

In recent years, the shipping industry has also carried out research on ship energy storage technology, but most of the research is a single energy storage unit, which cannot meet the needs of high energy density and high power density of the energy storage system, and the energy storage device is only for electric propulsion. The storage of ship braking feedback energy does not involve the use of energy storage system to adjust the generator set and ship power grid to maintain the stability of the power grid, improve the economy of the generator set, and reduce exhaust emissions

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