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A charging and discharging control method for energy storage units in a distributed energy storage DC microgrid

A technology of distributed energy storage and DC microgrid, which is applied in the direction of parallel operation of DC power supplies, electrical components, battery circuit devices, etc., can solve the problem of short life of the energy storage unit of the state of charge value, and achieve the effect of fast and accurate balance

Active Publication Date: 2021-07-27
STATE GRID XINJIANG ELECTRIC POWER CO ECONOMIC TECH RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and system for controlling the charging and discharging of energy storage units in a distributed energy storage DC microgrid, which is used to solve the problem of energy storage caused by the unbalanced state of charge value of each energy storage unit in the existing droop control method. Problems with short unit life

Method used

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  • A charging and discharging control method for energy storage units in a distributed energy storage DC microgrid
  • A charging and discharging control method for energy storage units in a distributed energy storage DC microgrid
  • A charging and discharging control method for energy storage units in a distributed energy storage DC microgrid

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Effect test

Embodiment 1

[0044] A charging and discharging control method for an energy storage unit in a distributed energy storage DC microgrid. In the discharging phase, the controller corresponding to the pth energy storage unit controls its discharge, and the controller corresponding to the qth energy storage unit controls its discharge. , and when SOC p >SOC q When , the discharge current controlled by the controller corresponding to the pth energy storage unit is greater than the discharge current controlled by the controller corresponding to the qth energy storage unit; in the charging stage, the controller corresponding to the pth energy storage unit Control its charging, the controller corresponding to the qth energy storage unit controls its charging, and when SOC p >SOC q , the charging current controlled by the controller corresponding to the pth energy storage unit is greater than the charging current controlled by the controller corresponding to the qth energy storage unit; where p an...

Embodiment 2

[0067] On the basis of embodiment one, the governing equation is: u dcj = u dcref -K j i dcj ·G j + r j i dcj , where r j Indicates the line impedance corresponding to the jth energy storage unit.

[0068] For example, figure 1 The power system in is simplified to get figure 2 ,Such as figure 2 As shown, n voltages are u dcref The power supply passes through the resistance m j (SOC) and r j The impedances are connected in parallel with each other, while giving an impedance of R load The resistor power supply, u pcc is the common point voltage, i dcj For the jth energy storage unit, the resistance is m j The output current output by the resistance of (SOC) can be obtained from the circuit relationship:

[0069]

[0070] The subscript j represents the relevant variable of the jth energy storage unit, such as i dcj Represents the output current of the jth energy storage unit, R s is the parallel impedance, and n represents the total number of energy storage...

Embodiment 3

[0092] A charging and discharging control system for energy storage units in a distributed energy storage DC microgrid, including: controllers corresponding to all energy storage units in the distributed energy storage DC microgrid; The controller controls its discharge, and the controller corresponding to the qth energy storage unit controls its discharge, and when the SOC p >SOC q , the discharge current controlled by the controller corresponding to the pth energy storage unit is greater than the discharge current controlled by the controller corresponding to the qth energy storage unit; in the charging stage, the pth energy storage unit corresponds to The controller controls its charging, and the controller corresponding to the qth energy storage unit controls its charging, and when the SOC p >SOC q , the charging current controlled by the controller corresponding to the pth energy storage unit is greater than the charging current controlled by the controller correspondin...

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Abstract

The invention relates to a charging and discharging control method and system of an energy storage unit in a distributed energy storage DC microgrid. A balance factor is introduced into the control equation, and in the discharge stage, the energy storage unit with a higher SOC outputs a higher discharge current. The energy storage unit with a lower SOC needs to release a lower amount of electricity; during the charging phase, the charging current of the energy storage unit with a higher SOC needs to be maintained at a lower level, and the energy storage unit with a lower SOC needs to obtain a larger charging current. In this way, the purpose of balancing the SOC of different energy storage units is achieved. The present invention introduces an equalization factor based on the state of charge SOC into the original droop coefficient, so that the charging and discharging conditions of each energy storage unit are continuously adjusted with its SOC value, so as to achieve the purpose of quickly balancing the SOC of each energy storage unit, and can realize various The rapid balance of the SOC of the energy storage unit improves the life of the energy storage unit.

Description

technical field [0001] The invention relates to the technical field of energy storage control of micro-dot grids, in particular to a charging and discharging control method and system for an energy storage unit in a distributed energy storage DC micro-grid. Background technique [0002] At present, with the prominence of environmental problems and the enhancement of human awareness of environmental protection, renewable distributed power sources such as photovoltaics and wind turbines, which have the advantages of cleanliness, renewability, and on-site consumption, have developed rapidly. Energy has become a research hotspot. [0003] Through grid-connected converters, distributed power sources such as photovoltaics and wind turbines can be connected to the DC grid in parallel. However, due to the volatility, intermittent and unstable characteristics of most distributed power sources in microgrids, it is necessary to realize large-scale distributed power generation. In orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J7/34
Inventor 曹新慧刘昱良晁凯云苗世洪刘子文车勇张伟李忠政李娟周二彪华东栗磊赫嘉楠
Owner STATE GRID XINJIANG ELECTRIC POWER CO ECONOMIC TECH RES INST
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