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A cascaded battery energy storage system and maintenance method

A battery energy storage system, battery energy storage technology, applied in the direction of electric energy storage system, flexible AC transmission system, electrical components, etc., can solve the problem of short life of battery pack, low utilization rate of energy storage, increase of operating cost of energy storage kWh and other issues to achieve the effect of prolonging life, reducing operating costs and improving energy storage utilization

Active Publication Date: 2018-03-27
SHANDONG SACRED SUN POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of online maintenance of the battery pack, the utilization rate of the energy storage is low, the life of the battery pack is short, and the operating cost of the energy storage unit is increased.

Method used

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  • A cascaded battery energy storage system and maintenance method
  • A cascaded battery energy storage system and maintenance method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 A structural diagram of a cascaded battery energy storage system provided by the present invention. The cascaded battery energy storage system includes: a battery management system (BMS) 10 and 3 sets of battery energy storage units, in order to distinguish the 3 sets of battery energy storage units, figure 1 Indicated by reference numerals 11, 12 and 13, respectively. The battery energy storage unit 11 includes a plurality of battery packs A1, A2, ... AN connected in parallel, and an H-bridge converter correspondingly connected to each battery pack A1, A2, ... AN. The battery energy storage unit 12 includes a plurality of battery packs B1, B2, ... BN connected in parallel, and an H-bridge converter correspondingly connected to each battery pack B1, B2, ... BN. The battery energy storage unit 13 includes a plurality of battery packs C1, C2, ...CN connected in parallel, and an H-bridge converter connected correspondingly to each battery pack C1, C2, ...CN.

...

Embodiment approach

[0041] As a preferred embodiment, the cascaded battery energy storage system further includes: a filter unit, the filter unit includes: 3 inductors;

[0042] Wherein, the inductor corresponds to each phase of the three-phase busbar and the battery energy storage unit one by one; one end of the inductor is correspondingly connected to the three-phase busbar, and the other end of the inductor is connected to the corresponding H-bridge converter.

[0043] Such as figure 1 As shown, an inductance is provided between the three-phase busbar and each battery energy storage unit, specifically: an inductance L is provided between each H-bridge converter in the battery energy storage unit 11 and the A phase A 1. An inductance L is arranged between each H-bridge converter in the battery energy storage unit 12 and the B-phase B 1. An inductance L is arranged between each H-bridge converter in the battery energy storage unit 13 and the C-phase C .

[0044] By increasing the inductance L...

Embodiment 2

[0046] figure 2 It is a flowchart of a maintenance method for a cascaded battery energy storage system provided by the present invention. Maintenance methods for cascaded battery energy storage systems, including:

[0047] S10: The battery management system sends battery charge state information, name and address to the energy management system and the main controller.

[0048] S11: The energy management system sends instructions to the main controller according to the state of charge information of the battery.

[0049] S12: The main controller receives the command, and sends an isolation command to the corresponding H-bridge converter according to the content contained in the command and the battery charge state information, name and address sent by the battery management system.

[0050] S13: the H-bridge converter executes the actions included in the isolation command, so as to isolate the battery pack that needs to be maintained.

[0051] S14: The main controller send...

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Abstract

The invention discloses a cascaded battery energy storage system and a maintenance method therefor. By increasing a maintenance controller and a maintenance control switch group, a main controller is enabled to send an isolation instruction to a corresponding H bridge converter according to an instruction of an energy management system and battery charge state information, name and address sent by a battery management system, so as to isolate a battery pack in need of maintenance, to send a switch-off instruction to the corresponding maintenance control switch for gating the battery pack in need of maintenance, and to send a maintenance instruction to the corresponding maintenance controller to control the battery pack for executing motions included in the maintenance instruction. The cascaded battery energy storage system can meet energy storage requirements of the cascaded battery energy storage system and achieves maintenance of the battery pack, so that the energy storage utilization rate of the cascaded battery energy storage system is improved, the service life of the battery pack is prolonged, and the energy storage degree electric operation cost is reduced. In addition, the invention also discloses a maintenance method corresponding to the system.

Description

technical field [0001] The invention relates to the field of energy storage and energy exchange, in particular to a cascaded battery energy storage system and a maintenance method. Background technique [0002] Although the use of renewable energy to generate electricity can alleviate the problem of energy waste, due to the volatility and intermittency of renewable energy, it will cause grid stability problems when connected to the grid on a large scale. Therefore, it is necessary to use energy storage methods to improve the acceptance capacity and stability. The current cascaded battery energy storage system has played an important role in improving the user-side distributed energy access capabilities, coping with disasters, ensuring power supply reliability, meeting power quality requirements, and peak-shaving and valley-filling. However, due to the lack of online maintenance of the battery pack, the utilization rate of energy storage is low, the life of the battery pack ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J15/00H02J3/32
CPCY02E40/10
Inventor 隋延波赵洪梅王书堂
Owner SHANDONG SACRED SUN POWER SOURCES
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