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Dynamic balance type fuel cell unmanned aerial vehicle energy management method

A fuel cell and energy management technology, which is applied in power management, battery/fuel cell control devices, unmanned aircraft, etc., can solve the problem of increasing auxiliary power output power, unmanned aerial vehicle dynamic performance and system stability, Problems such as the limited size of hydrogen cylinders

Active Publication Date: 2020-12-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] The current research on hybrid power usually only considers the hydrogen consumption of a single fuel cell as an optimization target. Although it can reduce the consumption of hydrogen, it will increase the output power of the auxiliary power supply accordingly.
It may cause the power of the auxiliary power supply to run out first and be powered by the fuel cell alone, which will have a great impact on the dynamic performance and system stability of the UAV.
[0004] In addition, most energy management methods are based on the premise of sufficient hydrogen storage and do not consider the total amount of hydrogen consumption. However, the actual situation is that the size of the hydrogen cylinder carried by the UAV is limited, that is, the hydrogen storage is limited, and the fuel cell can output. Electric power also has a maximum limit

Method used

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  • Dynamic balance type fuel cell unmanned aerial vehicle energy management method
  • Dynamic balance type fuel cell unmanned aerial vehicle energy management method
  • Dynamic balance type fuel cell unmanned aerial vehicle energy management method

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Embodiment

[0146] Load power demand curves using two different UAV flight profiles, such as Figure 5 shown. To verify the feasibility of the method, various initial battery capacities and SOCs were set. The rated capacity of the lithium battery is set to 1.5Ah, the initial SOC is 100%, the rated capacity is 2Ah, the initial SOC is 100%, and the rated capacity is 2Ah, the initial SOC is 80%, these three initial states; the hydrogen of the fuel cell The total amount was set to 8g. The first UAV load curve is as follows Image 6 As shown, the second UAV load curve is as follows Figure 7 shown.

[0147] The ratio of the SOC consumed by the lithium battery to the initial SOC represents its energy utilization, which is recorded as η SOC ,Calculated as follows:

[0148]

[0149] where SOC end Represents the SOC at the end time.

[0150] The ratio of the hydrogen consumed by the fuel cell to the total hydrogen storage represents the hydrogen utilization rate, denoted as Calculated...

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Abstract

The invention discloses a dynamic balance type fuel cell unmanned aerial vehicle energy management method. Aiming at an unmanned aerial vehicle hybrid power supply system taking a fuel cell as a mainpower supply and a lithium cell as an auxiliary power supply, multi-objective optimization energy management is performed based on fuel cell hydrogen consumption estimation on the premise of knowing the total hydrogen amount of the fuel cell, and the optimization objectives are respectively the hydrogen consumption rate (consumed hydrogen / total hydrogen) of the fuel cell and the energy utilizationrate (consumed electric quantity / total electric quantity) of the lithium cell. According to the method, the two objectives can keep dynamic balance, the situation that the electric quantity of one power supply in the hybrid power supply is exhausted firstly is avoided, the stability of the hybrid power supply system of an unmanned aerial vehicle can be maintained, and accordingly, the dynamic characteristic of the unmanned aerial vehicle is guaranteed.

Description

technical field [0001] The invention belongs to the field of energy optimization, and in particular relates to an energy management method for an unmanned aerial vehicle. Background technique [0002] A fuel cell is an electrochemical reaction device with a high energy conversion rate. It usually uses hydrogen as a fuel. It has the characteristics of zero emission and no pollution. It can effectively alleviate the energy crisis and environmental pollution problems. One of the most promising energy sources. In the research and experiments on pure hydrogen fuel cell drones at home and abroad, it is found that the high energy density (energy / weight) of fuel cells can make the drone's endurance time reach tens of hours, but its power density (power / weight) Weight) is relatively low, which cannot meet the needs of fast dynamic response during high-altitude and long-duration flight of UAVs. Therefore, adding a high power density auxiliary power supply and fuel cell to form a hyb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/40B64D27/24
CPCB60L58/40B64D27/24B60L2200/10B64U50/19Y02T90/40
Inventor 雷涛闵志豪张星雨王彦博付红杰张晓斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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