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A Distributed Autonomous Coordinated Control Method for DC Microgrid that Can Significantly Improve Bus Voltage Deviation

A technology of DC microgrid and bus voltage, which is applied in the direction of parallel operation of DC power supplies, to achieve the effects of improving bus voltage deviation, reducing bus voltage deviation, and improving power supply reliability and power quality

Active Publication Date: 2021-01-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purpose of equivalently amplifying the voltage signal is to reduce the DC bus voltage bias and prevent the problem of repeated actions of the mode switching signal due to the small actual voltage threshold range, thus affecting the normal operation of the system
It solves the problem that the traditional DBS coordinated control requires a large offset of the DC bus voltage, improves the bus voltage deviation, and improves the power supply reliability and power quality of the DC microgrid

Method used

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  • A Distributed Autonomous Coordinated Control Method for DC Microgrid that Can Significantly Improve Bus Voltage Deviation
  • A Distributed Autonomous Coordinated Control Method for DC Microgrid that Can Significantly Improve Bus Voltage Deviation
  • A Distributed Autonomous Coordinated Control Method for DC Microgrid that Can Significantly Improve Bus Voltage Deviation

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Embodiment 1

[0058] Embodiment 1. In this embodiment, the bus voltage is partitioned as follows:

[0059] The DC bus voltage V bus From small to large, from 1 to N, respectively N voltage threshold intervals, namely V 1 , V 2 ,...V N N voltage thresholds, and each voltage threshold interval is continuous, N is a positive integer not less than 3 and is an odd number, where the first A voltage threshold interval (voltage threshold) is the rated working interval (rated voltage);

[0060] The interval length of each voltage threshold interval is 1 times the hysteresis loop width 2V D , the lower limit V of the normal operation of the DC microgrid min The hysteresis loop width is 2V, which is twice the distance from the first voltage threshold interval D , namely V 1 –2V D –V min = 4V D , upper limit V max The hysteresis loop width is 2V, which is twice the distance from the nth voltage threshold interval D , namely V max –(V N +2V D ) = 4V D .

[0061] above V D It is ha...

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Abstract

The invention relates to a distributed autonomous coordinated control method of a DC micro-grid that can significantly improve bus voltage deviation, in particular to an improved distributed autonomous coordinated control method based on a DBS (DC Bus Signaling) coordinated control method. Mainly, the DC bus voltage signal is sampled and transmitted to the local controller, and then the sampled voltage signal is amplified according to the proposed equivalent amplification rule, and it is used as a judgment basis for coordinated control. The purpose of equivalently amplifying the voltage signal is to reduce the DC bus voltage bias and prevent the problem of repeated action of the mode switching signal due to the small actual voltage threshold range, thereby affecting the normal operation of the system. It solves the problem that the traditional DBS coordinated control requires a large offset of the DC bus voltage, improves the bus voltage deviation, improves the power supply reliability and power quality of the DC microgrid, and can be applied to DC load scenarios that require high power quality .

Description

technical field [0001] The invention relates to a distributed autonomous coordinated control method of a DC microgrid that can significantly improve busbar voltage deviation, improves the power supply reliability and power quality of a DC microgrid, and specifically relates to a control method for switching operation modes of each terminal unit of a DC microgrid . Background technique [0002] With the development of science and technology and the gradual reduction of fossil fuels, the application of new energy power generation has become more and more popular. Due to the randomness of most new energy sources, these distributed power sources are unstable, so when a large number of these power sources are connected to the public large power grid, they will have an impact on the large power grid. In order to solve these existing problems and enable the distributed power generation of renewable energy to be smoothly connected to the public power grid, the concept of microgrid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 刘宿城李响刘晓东方炜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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