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Self-adaptive method for controlling current charge and discharge of ultra-capacitor and system thereof

A technology of adaptive control and charging and discharging current, applied in the field of power supply, can solve the problems of poor real-time performance of the system power distribution strategy, difficulty in meeting the sharp change of vehicle driving power, and the output current of the supercapacitor cannot well meet the system power demand, etc. To achieve the effect of prolonging the cycle life

Inactive Publication Date: 2011-09-14
TSINGHUA UNIV +1
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  • Description
  • Claims
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Problems solved by technology

As a result, the output current of the supercapacitor cannot well meet the system power demand at the current moment, and the system power distribution strategy is poor in real-time, especially difficult to meet the requirements of rapid changes in vehicle driving power under the conditions of use of electric vehicles

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  • Self-adaptive method for controlling current charge and discharge of ultra-capacitor and system thereof
  • Self-adaptive method for controlling current charge and discharge of ultra-capacitor and system thereof
  • Self-adaptive method for controlling current charge and discharge of ultra-capacitor and system thereof

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Embodiment Construction

[0017] Referring to the accompanying drawings, specific embodiments of the present invention will be further described.

[0018] The present invention proposes an adaptive control method for the charging and discharging current of a supercapacitor. On the basis of the external characteristic curve Lb with an output slope of kb of the power battery pack, a power converter boosting external characteristic curve Ld for controlling the discharging process of the supercapacitor is set. , the slope is kd. The open circuit voltage of the external characteristic curve Lb is Eb, and the open circuit voltage of the external characteristic curve Ld is Ed. On the external characteristic curve Lb, the threshold current corresponding to the voltage Ed is I0 (the value range is generally smaller than the current value corresponding to the 1C discharge rate of the power battery pack, for example, the current value corresponding to the 0.8C discharge rate of the power battery pack); figure 1 ...

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Abstract

The invention relates to a self-adaptive method for controlling current charge and discharge of an ultra-capacitor and a system thereof, which belongs to the technical field of power supply. The method comprises the step of setting threshold current I0 on the basis of outputting an external characteristic Lb by a power battery, wherein when the current output by the power battery is greater than the I0, a dual-directional power converter controls the ultra-capacitor to be at a discharge state, and the discharge current of the ultra-capacitor increases with the increment of the current output by the power battery; and when the current output by the power battery is less than I0, the dual-directional power converter controls the ultra-capacitor to be at a charge state, and the charge current of the ultra-capacitor increases along with the decrease of the current output by the power battery. The system comprises a power battery set, an ultra-capacitor and a dual-directional power converter connected between the output end of the power battery and the output end of the ultra-capacitor. The adaptive method controls the charge-discharge state of the ultra-capacitor and the current, limits the discharge current of the power battery and improves the service life of the power battery.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to an adaptive control method for charging and discharging current of a supercapacitor. Background technique [0002] Power battery packs have been widely used in new energy technology fields such as electric vehicles. However, limited by the working principle and manufacturing level of the power battery, the cycle life of the advanced power battery packs (for example: nickel-metal hydride battery packs, lithium-ion battery packs, etc.) used in electric vehicles is not satisfactory. As the discharge current of the power battery pack increases, its cycle life decreases significantly. The experimental research results show that the cycle life of a certain type of 100Ah lithium-ion power battery pack is 1200 times when it is discharged at a constant current of 100A, and the cycle life is only 600 times when it is discharged at a constant current of 200A. Moreover, as the state ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02M3/155
Inventor 黄勇柯轶炜王璘吴锦俊
Owner TSINGHUA UNIV
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