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Micro grid hybrid energy storage power coordinated control method and system

A hybrid energy storage and coordinated control technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as affecting the service life of the battery, changing the charging and discharging states, etc., and achieve the effect of prolonging the service life and ensuring the life.

Active Publication Date: 2022-05-10
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used method is to pass the high and low frequency components in the power fluctuations to the supercapacitor and the battery for processing respectively through a low-pass filter, etc., but this method will introduce the intermediate frequency and high frequency fluctuations in the reference power, so that The battery frequently changes its charge and discharge state, which affects the service life of the battery

Method used

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  • Micro grid hybrid energy storage power coordinated control method and system
  • Micro grid hybrid energy storage power coordinated control method and system
  • Micro grid hybrid energy storage power coordinated control method and system

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Embodiment 1

[0029] Embodiment 1. A method for coordinated control of hybrid energy storage power in a microgrid, including:

[0030] According to the output deviation between each branch output unit, the total user demand load is distributed to each branch output unit to obtain the reference power of each branch output unit; according to the reference power of each branch output unit, the required throughput of each branch energy storage is determined reference power;

[0031] The reference power of the supercapacitor is determined according to the reference power required by each branch energy storage and the preset reference power for charging and discharging the battery; the energy storage device is controlled to complete switching according to the reference power of the battery and supercapacitor.

[0032] The method of the present invention is applied to a hybrid energy storage system in a microgrid, and the hybrid energy storage system includes:

[0033] 1) Configured on the DC sid...

Embodiment 2

[0055] Embodiment 2. On the basis of Embodiment 1, a coordinated control method for hybrid energy storage power of a microgrid is provided, including: setting the reference power of charging and discharging of batteries in each branch energy storage system; the specific method is as follows:

[0056] Taking the set time interval as the sampling point, the selected time period is discretized to obtain the throughput power value P Bi,j , where j=1, 2, ... T, T is the total number of sampling points, the time period selected in this embodiment is one day, and the total number of sampling points is 24, corresponding to 24 time points respectively.

[0057] Calculate the average output power of the battery pack in the i-th hybrid energy storage unit on the previous day The expression is:

[0058]

[0059] In the formula, P Bi,j Indicates the discharge power of the battery pack in the i-th hybrid energy storage unit at time j;

[0060] Taking the same set time interval as the...

Embodiment 3

[0065] Embodiment 3: Microgrid hybrid energy storage power coordinated control system. The structure of the microgrid hybrid energy storage power coordinated control system in this embodiment includes: a primary control system, a secondary control system, and a tertiary control system (as shown in the figure ), wherein the primary control system is used to determine the current output of each branch output unit according to the current output power of the micro-source and the current absorption or discharge power of the energy storage; determine the energy storage of each branch according to the reference power of each branch output unit The reference power that needs to be handled, and the reference power command that needs to be handled by each branch energy storage is sent to the secondary control system; The reference power of charging and discharging the battery determines the reference power of the supercapacitor; sends the reference power command of the battery and super...

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Abstract

The invention discloses a micro-grid hybrid energy storage power coordination control method and system. According to the output deviation between each branch output unit, the total user demand load is distributed to each branch output unit to obtain the reference power of each branch output unit and each branch output unit. The reference power that needs to be handled by the branch energy storage; the reference power of the supercapacitor is determined according to the reference power that needs to be handled by each branch energy storage and the reference power for charging and discharging the battery; the energy storage device is controlled according to the reference power of the battery and the supercapacitor Complete switching. The present invention takes the micro-source output as the main energy storage output as the supplementary idea, and according to the output power of the micro-source and energy storage, the total demand load of the micro-grid is coordinated and distributed to each branch output unit, and further distributed to obtain each branch micro-source 1. Power command for energy storage; make the energy storage battery switch between charging and discharging states according to the determined reference power, prolonging the service life of the battery.

Description

technical field [0001] The invention relates to a micro-grid hybrid energy storage power coordination control method and system configured in a micro-source DC link in a micro-grid, and belongs to the field of optimal distribution of a micro-grid energy storage system. Background technique [0002] In the microgrid, the energy storage system is configured in the DC link of each microsource inverter, which can improve the power output characteristics of clean microsources such as wind power and photovoltaics while regulating the overall energy of the system. Relevant studies and applications have shown that by combining power-type energy storage elements with small capacity, fast response speed, and high energy storage efficiency (such as supercapacitor banks) with energy-type energy storage elements (battery packs) with large capacity and high energy ratio , and through appropriate control strategies to compensate for power fluctuations, can make energy storage devices more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32H02J3/46
CPCH02J3/32H02J3/466H02J2203/10
Inventor 钟劲松王少林冉懿冉新涛于金平俞海猛
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER
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