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DC microgrid parallel energy storage battery state of charge balance control method and device

A DC microgrid and energy storage battery technology, which is applied to battery circuit devices, load balance in DC networks, circuit devices, etc., can solve the problem of high discharge power of energy storage batteries, endangering the operation stability of DC microgrids, and energy storage batteries. Unbalanced state of charge and other issues, to achieve consistent output power

Active Publication Date: 2021-01-26
SHANGHAI XILONG SOLAR ENERGY TECH +1
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Problems solved by technology

However, due to unbalanced line impedance and inconsistent state of energy storage batteries, traditional droop control methods often make the output power of energy storage batteries unbalanced, which in turn leads to unbalanced state of charge of energy storage batteries, and even excessive discharge power of some energy storage batteries. Causes over-discharge, which seriously affects the life of the energy storage battery and endangers the stability of the DC microgrid operation

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  • DC microgrid parallel energy storage battery state of charge balance control method and device
  • DC microgrid parallel energy storage battery state of charge balance control method and device
  • DC microgrid parallel energy storage battery state of charge balance control method and device

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Embodiment Construction

[0074] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0075] According to the method for balancing the state of charge of DC micro-grid parallel energy storage batteries provided by the present invention.

[0076] like figure 1 As shown, an embodiment of the DC microgrid parallel energy storage battery state of charge balance control method, which includes the following steps:

[0077] Step S1: Collect the first working state of each energy storage battery in the energy storage battery pack.

[0078] In the above technical solution, the first working sta...

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Abstract

The present invention provides a DC micro-grid parallel energy storage battery state of charge balance control method and device, which includes: collecting the first working state of each energy storage battery in the energy storage battery group; processing to obtain the energy storage battery in the energy storage battery group The second working state of the energy storage battery; based on the first working state and the second working state of each energy storage battery, the first control strategy is used to obtain a given voltage value output by the DC converter at the output end of each energy storage battery; based on A second control strategy is used to adjust the output voltage of the DC converter at the output end of each energy storage battery based on the given voltage value output by the DC converter at the output end of each energy storage battery. The invention detects the average state of charge of the parallel batteries in real time, and adopts an improved droop control strategy to adjust the output power of the energy storage battery, so as to accurately realize the balanced control of the state of charge of the parallel batteries.

Description

technical field [0001] The invention relates to the field of energy storage technology, in particular to a method and device for controlling the state of charge balance of DC microgrid parallel energy storage batteries. Background technique [0002] A large number of renewable power sources are used in the DC microgrid. In order to stabilize the fluctuation of the renewable power supply due to the influence of the environment, energy storage batteries are usually added to the DC microgrid to balance the power of the DC microgrid and improve the efficiency of the DC microgrid. stability. When the capacity of the energy storage battery is large, multiple energy storage batteries can be connected in parallel, and an appropriate control method can be used to realize the distribution of the output power of the parallel energy storage battery. [0003] Patent document CN106953379A discloses a method and device for equalizing the state of charge of parallel energy storage batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/14H02J7/00
Inventor 包俊林嘉伟唐建超王志新包龙新
Owner SHANGHAI XILONG SOLAR ENERGY TECH
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