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An energy management method for hybrid ships based on frequency method

A hybrid power and energy management technology, applied in a single AC network with different frequencies, ship propulsion, ship construction, etc., can solve problems that are not considered and affect the working performance and service life of diesel generator sets

Active Publication Date: 2020-01-14
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these control methods do not take into account the impact of the fluctuation of the ship's load power on the diesel generator set, which will affect the working performance and service life of the diesel generator set; based on this, the present invention proposes an energy management based on frequency method Methods to minimize the impact of load power fluctuations on diesel generator sets

Method used

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  • An energy management method for hybrid ships based on frequency method
  • An energy management method for hybrid ships based on frequency method
  • An energy management method for hybrid ships based on frequency method

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Experimental program
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Embodiment Construction

[0039] Step 1. Divide the load current into high and low frequency components

[0040] The proposed energy management method is based on the frequency distribution method using a polynomial control strategy through the figure 1 A low-pass filter shown divides the load current into high-frequency and low-frequency components; these components must be allocated to the connected sources of the DC bus according to their dynamic performance; in this paper, the high-frequency component HF is allocated to the lithium battery, and the low-frequency component LF is allocated to the The diesel generator set is shown in the expression (1):

[0041]

[0042] where I ch Indicates the load current, I busbatref Indicates the high frequency component of the load current, Iredref Indicates the low frequency component of the load current;

[0043] Step 2. Control the high frequency part

[0044] Based on the energy management of the frequency distribution method, the reference current of...

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Abstract

The invention discloses an energy management method for improving a hybrid ship by a frequency method. Lithium batteries which meet the energy demand of the hybrid ship are used as an auxiliary devicefor a variable-speed diesel permanent magnet generator set. A lithium battery module is connected to a direct current bus through a boosting transformer; a variable-speed diesel generator is connected to the direct current bus through a three-phase rectifier controller; and then, the current of the direct current bus is supplied for a motor through an inverter to be used as a propulsion system. The propulsion system can meet large energy demands required by the hybrid ship in propulsion, including the demand of energy for loading and the demand of internal devices.

Description

technical field [0001] The invention relates to the field of energy management of a hybrid ship, in particular to an energy management method for a hybrid ship based on a frequency method. Background technique [0002] The key technology of a hybrid ship is its energy management method. The purpose is to rationally allocate and coordinate control of various energy sources under the premise of satisfying the ship's dynamic performance, so that each component can operate efficiently. Some studies have been done on the energy management methods of hybrid ships at home and abroad; some scholars have proposed a hierarchical optimization energy control method based on the dynamic characteristics of the hybrid ship propulsion system; some domestic scholars have also proposed an energy management method based on logic thresholds, but It is still in the design stage; in addition, some scholars have also proposed a hybrid energy control method based on fuzzy logic control, but there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H21/17H02J3/02H02J3/46
Inventor 张伟高迪驹刘志全潘海邦
Owner SHANGHAI MARITIME UNIVERSITY