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Transformer substation direct-current power supply battery module mixed use and combination structure and control method

A DC power supply and battery module technology, applied in battery circuit devices, circuit devices, battery load switching, etc., can solve the problems of lower energy supply quality and higher battery replacement costs, and achieve the effect of improving reliability.

Pending Publication Date: 2021-11-09
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the long-term construction of substations and substations, the conventional load increases, and the capacity of the DC power supply battery pack must be expanded accordingly. Due to the different health status of the old and new batteries, the internal resistance, terminal voltage, and charge and discharge current of the battery will be different. Directly connected in parallel, the battery pack with large capacity will charge the battery pack with small capacity during discharge, and the quality of energy supply will decrease; the cost of replacing all battery packs will increase accordingly

Method used

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  • Transformer substation direct-current power supply battery module mixed use and combination structure and control method

Examples

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Effect test

Embodiment 1

[0036] see figure 1 As shown, the present invention provides a substation DC power supply battery module mixed and combined structure, including:

[0037] A number of battery strings Bi, a control management circuit Qi connected to the battery string Bi, and a buffer circuit Pi connected in series with the control management circuit Qi; the substation DC power supply battery module mixed and combined structure includes n sets of battery strings, 1≤i ≤n. Each battery string Bi is also equipped with a battery management system BMSi.

[0038] The control management circuit Qi includes a thyristor Di and a control management switch Si; the anode of the thyristor Di is connected to the positive pole of the battery string Bi, and the thyristor Di is connected in parallel with the control management switch Si; the negative pole of the thyristor Di is connected to the buffer circuit Pi;

[0039] The snubber circuit Pi includes a snubber resistor Ri and a snubber control switch Ki, a...

Embodiment 2

[0042] see figure 1 As shown, the present invention provides a control method for mixing and combining structure of DC power battery modules in substations, which is used to control the charging of DC power battery modules in substations, including the following steps:

[0043]S1. The battery management system BMSi acquires the actual charging state information of the battery string Bi, the actual charging state information includes the charging current of the battery string Bi, the charging voltage of the single cells in the battery string Bi, body battery temperature;

[0044] S2. During the charging process, compare the charging voltage of the single battery in the battery string Bi with the preset charging voltage, when the charging voltage of any single battery in the battery string Bi is lower than the preset charging voltage; the battery management system BMSi Open the buffer control switch Ki and close the control management switch Si to allow the charging equipment t...

Embodiment 3

[0049] see figure 1 As shown, the present invention provides a control method for mixing and combining structure of DC power battery modules in substations, which is used to control the discharge of DC power battery modules in substations, including the following steps:

[0050] S1. The battery management system BMSi obtains the battery charging state information of the battery string Bi; and calculates the current SOC-OCV state of the battery according to the battery charging state information of the battery string Bi, and compares the state with that stored in the battery management system BMSi Compare with the historical database to obtain the battery health status SOHi of the battery string Bi;

[0051] S2. All battery management systems communicate with each other to obtain the battery health status SOH of all battery strings; compare the battery health status SOH of all battery strings, find a group of battery strings Bx with the smallest battery health status SOH value;...

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Abstract

The invention belongs to the technical field of direct-current power supplies, and discloses a transformer substation direct-current power supply battery module mixed use and combination structure and a control method. The structure comprises a plurality of branch circuits connected with a direct current bus, wherein each branch comprises a buffer circuit Pi, a control management circuit Qi and a storage battery string Bi which are sequentially connected in series; the control management circuit Qi and the buffer circuit Pi can cooperate with each other and are used for controlling the charging and discharging states of the corresponding branch circuits; Each branch circuit comprises a battery management system BMSi; the battery management system BMSi is connected with a corresponding buffer circuit Pi and a control management circuit Qi, and is used for controlling the buffer circuit Pi and the control management circuit Qi according to the collected charging information of the storage battery string Bi. Through the buffer circuit and the control management circuit, the states of different battery pack strings in the charging and discharging process are adjusted, the requirement for parallel mixed use of different battery modules is met, and the overall reliability of the system is improved; and mixed use of direct-current power supply battery modules with different health states can be realized.

Description

technical field [0001] The present invention relates to the technical field of DC power supply, and more specifically, relates to a substation DC power supply battery module mixing and combining structure and control method. Background technique [0002] With the long-term construction of substations and substations, the conventional load increases, and the capacity of the DC power supply battery pack must be expanded accordingly. Due to the different health status of the new and old batteries, the internal resistance, terminal voltage, and charge and discharge current of the battery will be different. Directly paralleling the battery pack with large capacity will charge the battery pack with small capacity during discharge, and the quality of energy supply will decrease; the replacement cost of all battery packs will increase accordingly. [0003] Therefore, it is necessary to develop a targeted system to meet the capacity expansion requirements of different battery modules...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/34H02J7/00
CPCH02J7/34H02J7/0068
Inventor 黎可孙杨解晓东汪金礼穆居易胡晨孙召琴王绥军于冉金翼易永利尤育敢
Owner CHINA ELECTRIC POWER RES INST
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