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Battery current-limiting control method for multi-module parallel charging

A current-limiting control and multi-module technology, applied in charging/discharging current/voltage regulation, battery circuit devices, collectors, etc., can solve problems such as shortening service life, prolong service life and avoid long-term overcharging.

Active Publication Date: 2016-09-07
KEHUA DATA CO LTD
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Under light-load or no-load conditions, the phenomenon of overcharging when the battery has not reached the equalization point is often ignored, so that the service life of the battery will be shortened when the battery is working for a long time

Method used

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  • Battery current-limiting control method for multi-module parallel charging

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Such as figure 1 As shown, this embodiment provides a battery current limiting control method for multi-module parallel charging, which is used in a system where N charging modules are connected in parallel, and the outputs of N charging modules are connected in parallel and connected to the battery; each charging module operates independently And adopt voltage outer loop, electric current inner loop to control, the current value I of the PI regulator output of described voltage outer loop o The output value I obtained by a current limiting unit after inversion ref As a given value of the current inner loop; wherein, the battery current limiting control method includes the following steps:

[0032] Step S1: adopt a monitoring unit to sample the charging current I of the battery in real time bat ;

[0033] Step S2: The monitoring unit judges t...

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Abstract

The invention relates to a battery current-limiting control method for multi-module parallel charging. The charging current of a battery is sampled by a monitoring unit in real time; if the charging current is greater than a first threshold value, the monitoring unit sends out a subtracting instruction; if the charging current is less than a second threshold value, the monitoring unit sends out an adding instruction; and each module adjusts the output current according to the corresponding instructions. According to the battery current-limiting control method, the charging current for the battery is stabilized within a set range without causing a battery overcharging phenomenon; and long-term overcharging of the battery is avoided, so that the battery can be protected and the service life of the battery can be prolonged consequently.

Description

technical field [0001] The invention relates to a multi-module photovoltaic charger control technology, in particular to a battery current limiting control method for multi-module parallel charging. Background technique [0002] Solar energy is regarded as one of the most promising renewable energy sources in new energy sources. The core of the solar off-grid power generation system is the photovoltaic controller. Compared with the traditional centralized photovoltaic controller, the modular photovoltaic controller has the advantages of convenient maintenance, high reliability and online expansion, and is a more promising photovoltaic controller. In the process of multi-module photovoltaic controllers running independently at the same time, when the load changes, the battery with a small rated capacity will be overcharged, which is not conducive to prolonging the service life of the battery. [0003] In the application of multi-module photovoltaic chargers, batteries with ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/007
Inventor 张蓬勃黄伟平焦保帅
Owner KEHUA DATA CO LTD
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