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Charge control method of low-power independent photovoltaic generating system

A charging control method and independent photovoltaic technology, applied in the direction of energy-saving charging equipment, battery circuit devices, collectors, etc., can solve the problems of not analyzing the reasons for system efficiency, not matching the working status of photovoltaic cell arrays and lead-acid batteries, etc. , to achieve the effect of enhancing the absorption capacity and realizing the charging system

Inactive Publication Date: 2012-02-15
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in the low-power independent photovoltaic power generation system that has been applied, the reasons that really affect the system efficiency have not been analyzed, and the system efficiency is only considered from the perspective of the output power of the photovoltaic cell array, which does not have a good understanding of the photovoltaic cell array and lead-acid battery. The working state is matched, so its charging control strategy has certain limitations

Method used

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  • Charge control method of low-power independent photovoltaic generating system
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  • Charge control method of low-power independent photovoltaic generating system

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Embodiment 1

[0048] figure 1 The control structure of the low-power independent photovoltaic power generation system is described, and the charging control strategy program is solidified in the control MCU. The implementation process of the charging control strategy is: the control MCU collects the output voltage and output current of the photovoltaic cell array through the U / I detection module, as well as the charging voltage and charging current of the lead-acid battery, and resets the PWM control after the calculation of the charging control strategy. By modifying the duty cycle of the PWM to control the DC-DC converter, the charging power and charging current of the lead-acid battery are controlled, so that it can charge the lead-acid battery according to the charging control strategy.

[0049] figure 2 It is the control flow chart of the charging control strategy, and its main implementation steps are as follows:

[0050] Step 1: System hardware initialization;

[0051] Step 2: Se...

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Abstract

The invention discloses a charge control method of a low-power independent photovoltaic generating system, belonging to the technical field of photovoltaic power generation. In the method, the charge efficiency of the independent photovoltaic generating system is improved by fully utilizing the output characteristic of the photovoltaic battery array and the charge characteristic of the lead-acid storage battery, optimum matching of the photovoltaic battery array and the lead-acid storage battery is realized, meanwhile, the acceptable charge current of the lead-acid storage battery is strengthened through self discharge of the lead-acid storage battery and the lead-acid storage battery is ensured to completely absorb the electric energy output by the photovoltaic battery array during charging, thus achieving the aim of improving the charge efficiency of the independent photovoltaic generating system.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and relates to a charging control method for a low-power independent photovoltaic power generation system. technical background [0002] Solar energy is a clean, renewable energy source that is readily available. Solar cells can directly convert solar energy into electrical energy without any pollution to the environment. In recent years, with the rapid development of photovoltaic power generation technology, combined with the basic national conditions of our country, the application of independent photovoltaic power generation systems is expanding day by day. Due to the advantages of solar energy in safety, energy saving, convenience, and environmental protection, the application is becoming larger and larger. [0003] The independent photovoltaic power generation system consists of photovoltaic cell arrays, controllers, lead-acid batteries and loads. The controller is the control ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCY02E70/40Y02E60/10
Inventor 吴敏曹卫华陈鑫李明杨安剑奇
Owner CENT SOUTH UNIV
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