Constant-amplitude impulse current charging method combining positive and negative pulses

A technology of pulse current and charging method, which is applied in the field of electric power system, can solve the problems such as unable to maintain fast charging with large current, and achieve the effect of improving charging speed and efficiency

Inactive Publication Date: 2014-02-26
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to provide a constant-amplitude pulse current charging method combining positive and negative pulses, which solves the problem that the

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  • Constant-amplitude impulse current charging method combining positive and negative pulses
  • Constant-amplitude impulse current charging method combining positive and negative pulses
  • Constant-amplitude impulse current charging method combining positive and negative pulses

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[0015] The specific steps of the present invention are:

[0016] a. DC power supply: DC power supply is generally a photovoltaic cell obtained after rectification and filtering of AC power supply or after MPPT;

[0017] b. Monitoring of battery SOC: use density method, open circuit voltage method, and internal resistance method to monitor battery SOC online at the beginning of charging and during charging;

[0018] c. The control of the frequency modulation pulse and charging current in the first stage: the battery SOC is monitored as state 1, and the frequency conversion pulse is the period T 1 , Duty cycle d 1 =0.83 pulse;

[0019] d. The first stage negative pulse control: the first stage negative pulse is the pulse generated by the current generated by the reverse discharge of the capacitor through the IGBT; the pulse period is T 1 , Duty cycle d 1 ’ =(1- d 1 ) / 2, the initial angle is α 1 =-360×3 (1- d 1 ) / 4;

[0020] e. The second stage of frequency modulation pulse and negative pu...

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Abstract

The invention relates to a constant-amplitude impulse current charging method combining positive and negative impulses, belongs to the field of electric power systems and aims to provide a constant-amplitude impulse current charging method combining positive and negative pulses and the constant-amplitude impulse current charging method combining positive and negative impulses is used for solving the problem that a heavy current cannot be continually used for charging rapidly in a charging process. The method comprises the following specific steps: monitoring the SOC (Start of Conversion Pulse) of a direct-current power supply and a storage battery, controlling first-stage frequency modulation impulses and the charging current, controlling first-stage negative impulses, controlling second-stage frequency modulation impulses and negative impulses, and starting performing third-stage impulse current charging on the storage battery when the charge capacity of the rechargeable storage battery is increased to a set value 2; after the SOC is increased continually, charging by virtue of adjusting the cycles and duty ratios of the frequency modulation impulses and the negative impulses continually. By virtue of the constant-amplitude impulse current charging method provided by the invention, the variance of the SOC of the storage battery can be monitored in the process of charging, the cycle and duty ratio of the frequency modulation impulses and the cycle, duty ratio and initial angle of the negative impulses are adjusted in different periods, and the storage battery with a heavy current can be maintained in a minimal adverse effect, so that the charging speed and efficiency of the storage battery can be improved greatly.

Description

technical field [0001] The invention belongs to the field of power systems. Background technique [0002] Due to the traditional charging mode and general pulse charging, the charging current must be reduced with the increase of the charging capacity to suppress the adverse effects of gassing and temperature rise caused by the increase of the battery charge (SOC) and the internal chemical reaction. Decreasing will reduce the charging speed, resulting in a decrease in charging efficiency. Contents of the invention [0003] The object of the present invention is to provide a constant-amplitude pulse current charging method combining positive and negative pulses, which solves the problem that the constant-amplitude pulse current charging method combined with positive and negative pulses cannot maintain continuous high-current fast charging during the charging process. [0004] Concrete steps of the present invention are: [0005] a. DC power supply: DC power supply is gener...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 党克蔡铖澄
Owner NORTHEAST DIANLI UNIVERSITY
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