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Networking type direct-current microgrid energy cooperative control method

A DC microgrid and collaborative control technology, applied in the parallel operation of DC power supply, AC network circuit, electrical components, etc., can solve the problem of less research on the interaction between microgrid and public power grid, and achieve the plug-and-play, maintenance system The effect of power balance

Pending Publication Date: 2020-01-03
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on intelligent microgrid mainly focuses on the energy router topology and microgrid system architecture, and there are few studies on the interaction between microgrid and public grid.

Method used

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  • Networking type direct-current microgrid energy cooperative control method
  • Networking type direct-current microgrid energy cooperative control method
  • Networking type direct-current microgrid energy cooperative control method

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Experimental program
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Embodiment 1

[0032] figure 1 The DC microgrid structure used in the present invention consists of figure 1 It can be seen that the DC microgrid studied in the present invention includes distributed power generation units represented by photovoltaics, energy storage units that can compensate for the energy shortage of the microgrid and ensure the balance of the microgrid, multiple types of load units, and connected DC microgrids. The energy router (ER) of the grid and the AC grid supports bidirectional energy flow between the DC microgrid and the external grid. Each unit is connected to the DC bus through a bidirectional DC-DC converter.

[0033] The invention relates to a networked DC microgrid energy coordinated control method, comprising the following steps:

[0034] Step 1: Divide different voltage levels according to the bus voltage value of the DC microgrid, define different voltage levels as different working modes, and ensure that at least one unit controls the DC bus voltage in e...

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Abstract

The invention provides a networking direct-current microgrid energy cooperative control method, which comprises the steps: different voltage level layers are divided according to a direct-current busvoltage value of the direct-current microgrid; and the voltage level layers are set to be working modes, at least one local unit in each working mode exists to control the direct-current bus voltage,and system power balance is kept. A control method is designed for each local unit in the direct-current microgrid, and different working modes are switched when the voltage of the direct-current buschanges. According to the networking type direct-current microgrid energy cooperative control method provided by the invention, the working mode can be adjusted according to the working voltage valueof the direct-current microgrid, the system power balance is maintained, and the plug-and-play requirement of each unit under a non-communication condition is met.

Description

technical field [0001] The invention relates to the technical field of DC microgrid energy coordination, in particular, to a networked DC microgrid energy coordinated control method. Background technique [0002] In the research on microgrid, the DC microgrid connects the distributed power supply and energy storage to provide energy to the corresponding loads of the system through the DC bus. Since most of the electric energy generated by new energy generation units such as photovoltaics is DC, the use of DC microgrid not only reduces the The AC-DC conversion device is used, which reduces the cost and unnecessary loss, and there are no problems such as frequency fluctuation and reactive power loss in the DC grid. Therefore, the research on DC microgrids is becoming more and more popular. [0003] Due to the intermittent and fluctuating nature of distributed energy, the microgrid system needs to be connected to a reliable public grid. At the same time, with the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J3/38
CPCH02J1/10H02J3/381
Inventor 于艾清丁雨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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