Power grid energy storage system

A technology for energy storage systems and power grids, applied in current collectors, electric vehicles, electrical components, etc., can solve problems such as voltage inconsistency, floating charge balance, and limited power grid energy storage capacity, and achieve the effect of improving dynamic performance and improving dynamic performance

Pending Publication Date: 2018-02-06
无锡丰晟科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because lithium-ion batteries cannot be floated and balanced like lead-acid batteries, resulting in the higher the series voltage, the more serious the voltage inconsistency of lithium-ion battery cells in the battery pack, but the power grid that lithium-ion battery

Method used

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Embodiment Construction

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, a further detailed description will be given below in combination with specific data. Here, the illustrative examples of the present invention are used to explain the present invention, but not to limit the present invention.

[0027] Depend on figure 1 As shown, the present invention includes a plurality of battery modules 2, and each battery module 2 includes: a lithium battery 4, a DC / DC converter 3 connected to the lithium battery 4, and all DC / DC converters 3 are respectively connected to the DC bus 1 to form a parallel connection.

[0028] An autonomous current sharing control module 5 is connected between the DC / DC converters 3, and the figure 2 It can be seen that the autonomous current sharing control module 5 is preferably a communication module, and the communication module can adopt CAN bus communication mode, and the current sharing control strategy can be d...

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PUM

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Abstract

The invention discloses a power grid energy storage system, which includes a plurality of battery modules, and the battery modules include: a lithium battery, a DC/DC converter, and all DC/DC converters are connected to a DC bus to form a parallel connection, and the DC/DC There is an independent current sharing control module connected between the converters, and a communication module, a droop control unit or other independent current sharing control modules are connected between the DC/DC converters in the invention, so as to ensure that the DC/DC converter can work in presence/absence The self-balanced current mode under the condition of the communication module can also connect the autonomous current-balanced control module with the central computer to realize the orderly charging and discharging mode of the lithium battery, and can also use the remote control terminal to realize remote monitoring. The present invention is applicable to various Current sharing, charge and discharge working status, the dynamic performance is significantly improved, and it is also suitable for different situations such as "different battery charge states", "different battery power levels", "single module failure" and other situations in the battery pack, and it is easy to implement more complex energy scheduling strategies And improve the dynamic performance of the grid energy storage system.

Description

technical field [0001] The invention relates to the field of group application of power lithium-ion batteries and power energy storage, in particular to a power grid energy storage system suitable for multiple DC / DC converters. Background technique [0002] As an indispensable part of the use of new energy, battery energy storage also affects the development of new energy. With the continuous expansion of my country's power grid capacity, the increasing peak-to-valley difference, and the vigorous development of renewable energy, distributed energy supply and smart grid, the demand for large-scale development of battery energy storage technology is increasing. However, battery pack technology has become a technical bottleneck for the large-scale development of energy storage. [0003] The direct parallel use of multiple lithium batteries in different states will cause abnormal flow of power and cause damage to the battery. A DC / DC conversion device is connected in series wit...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02J7/34
CPCH02J1/10H02J7/34
Inventor 时玮吴丛笑查志敏吴旭彪
Owner 无锡丰晟科技有限公司
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