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Charging control method and system for composite power system

A charging control method and composite power supply technology, applied in the field of photovoltaic systems, can solve difficult problems such as full charging of the system, and achieve the effects of ensuring reliability, good application prospects, and expanding the application range

Active Publication Date: 2020-10-13
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is difficult to fully charge the system due to the fluctuation of new energy generation and temperature.

Method used

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  • Charging control method and system for composite power system
  • Charging control method and system for composite power system
  • Charging control method and system for composite power system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] 1. Circularly collect the cell voltage of the battery, and collect the battery temperature;

[0040] 2. According to the experimental data, record the corresponding relationship table between temperature, SOC and cell voltage;

[0041] temperature SOC Single voltage T1 100％ V10 98％ V11 95％ V12 90％ V13 T2 100％ V20 98％ V21 95％ V22 90％ V23 T3 。。。 。。。

[0042] 3. Design the photovoltaic charging power meter corresponding to the state of charge of the battery;

[0043] serial number Single highest voltage correspondence Set the maximum photovoltaic power >100％ standby 0 >98％ 3kW >95％ 5kW >90％ 10kW 。。。 。。。 other open

[0044] According to the current temperature of the battery pack, look up the corresponding voltage table of the state of charge, and then control the photovoltaic charging power not to exceed the maximum power when the...

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Abstract

The invention provides a charging control method and system for a composite power supply system, and the method comprises the steps: judging whether there is an external power supply input or not whenthe temperature of a battery is lower than a preset temperature and the battery is not fully charged; when the judgment result is yes and the external power supply is the mains supply, starting heating, and when the temperature of the battery reaches a preset temperature or above, charging the battery through the mains supply; if the judgment result is yes and the external power supply is photovoltaic, starting heating and detecting whether the battery is in a discharge state or not; when the battery is in a non-discharge state, continuously heating until the temperature of the battery reaches a preset temperature or above; and when the battery is in the discharge state, starting the timer to time the duration of the single discharge current, stopping heating when the timer times to a first preset time, starting timing again, and judging whether photovoltaic input exists or not again after a second preset time is reached. The charging safety problem in a low-temperature environment can be effectively solved, and the reliability of low-temperature charging is ensured.

Description

technical field [0001] The invention relates to the field of photovoltaic systems, in particular to a charging control method and system for a composite power supply system. Background technique [0002] With the reduction of the cost of new energy power generation and the maturity of energy storage battery technology, the characteristics of on-site energy acquisition and flexible power consumption of the photovoltaic power generation and electrochemical energy storage composite power system have greatly supplemented the power grid, and the application is becoming more and more popular. . [0003] At present, the conventional solar-storage-charge composite power system generally adopts the method of constant current and then constant total voltage for two-stage charging. In the system of multi-string battery packs, due to the difference of single cells, there is a situation that it cannot be fully charged. In a low temperature environment, the battery pack needs to be heat...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J7/35
CPCH02J7/007194H02J7/00309H02J7/35Y02E10/56
Inventor 王亮赵斌张晨安石峰覃保东董晓冬闵凡奇程伟刘娜刘辉戚頔莫旭娟
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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