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Distributed voltage source converter cooperative control method and AC-DC hybrid microgrid

A voltage source converter and cooperative control technology, applied in the parallel operation of DC power supply, current collectors, battery circuit devices, etc., can solve problems such as lack of applicable methods

Active Publication Date: 2021-05-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for multiple VSG power converters distributed on various wind power plants / solar photovoltaic generators in a microgrid, how to coordinate them to effectively provide enough inertia to reduce frequency interference, there is currently no solution
[0008]In addition, although the virtual impedance method has more advantages than the other two DC microgrid inertial control methods, for multiple voltage source transformations distributed at different locations in the microgrid In the case of the device, there is still a lack of applicable methods
That is to say, there is currently no technical solution that can combine the virtual inertia created by all converters together to improve the inertia of the microgrid system and stabilize the DC bus voltage changes caused by sudden changes in load or power generation

Method used

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  • Distributed voltage source converter cooperative control method and AC-DC hybrid microgrid
  • Distributed voltage source converter cooperative control method and AC-DC hybrid microgrid
  • Distributed voltage source converter cooperative control method and AC-DC hybrid microgrid

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Embodiment 1

[0060] In one or more embodiments, a distributed voltage source converter cooperative control method is disclosed, which is used in an AC / DC hybrid microgrid powered by renewable energy to realize distributed cooperative control.

[0061] figure 1 An overview of an AC-DC hybrid microgrid powered by renewable energy is presented (only solar and wind are shown, but tidal, wave, geothermal, hydro, bioenergy, etc. are also applicable). The microgrid includes a DC sub-grid and an AC sub-grid, which are connected together through bidirectional interconnection converters. Each sub-grid has distributed energy resources (DERs) and connected loads. The DC sub-grid has M DERs, and the AC sub-grid has N DERs.

[0062] figure 2 An internal view of each distributed energy resource (DER) in the DC subgrid is given. Solar and wind power sources are connected to the DC bus through a step-up DC-DC converter, and the resulting renewable energy is stored in an energy storage system (ESS).

...

Embodiment 2

[0120] In one or more embodiments, an AC / DC hybrid microgrid is disclosed, which adopts the distributed voltage source converter coordinated control method in Embodiment 1 to realize the coordinated control of the AC / DC grid.

Embodiment 3

[0122] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program implements the distributed voltage source converter cooperative control method in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The invention discloses a distributed voltage source converter cooperative control method and an AC-DC hybrid microgrid. The distributed voltage source converter cooperative control method comprises the following steps of: adjusting a power flow between an AC sub-grid and a DC sub-grid through a bidirectional interconnection converter; when the load of the AC sub-grid suddenly changes, calculating the total optimal power input of the AC sub-grid, and judging whether the DER total power in the current AC sub-grid reaches the total optimal power input of the AC sub-grid or not; if so, calculating the input power contribution of each DER in the AC sub-grid through using a virtual inertia algorithm; and if not, indicating that the DER in the DC sub-grid has redundant power, the DC sub-grid participates in cooperative control. According to the distributed voltage source converter cooperative control method, the inertia of the micro-grid is remarkably improved, the communication bandwidth is reduced, the service life of storage equipment is prolonged, and the method has the characteristic of quick and stable control.

Description

technical field [0001] The invention relates to the technical field of coordinated control of distributed voltage source converters, in particular to a method for coordinated control of distributed voltage source converters and an AC / DC hybrid microgrid. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] To reduce the environmental impact of greenhouse gases that cause global warming, the demand for electricity from renewable sources is increasing. 40% of total carbon dioxide emissions in the atmosphere are generated by electricity generation worldwide. Therefore, the power industry's energy needs to shift from non-renewable energy sources (such as coal and natural gas) to more sustainable energy sources (such as solar energy, wind energy, water energy, hydrogen energy, etc.). However, with existing technologies, this change in energy form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/24H02J1/10H02J7/34
CPCH02J5/00H02J3/241H02J1/10H02J7/34
Inventor 张祯滨欧路利可·巴巴悠米李真王瑞琪胡存刚
Owner SHANDONG UNIV
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