DC microgrid distributed autonomous coordination control method capable of remarkably improving 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: 2019-11-12
ANHUI UNIVERSITY OF TECHNOLOGY
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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 oper

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  • DC microgrid distributed autonomous coordination control method capable of remarkably improving bus voltage deviation
  • DC microgrid distributed autonomous coordination control method capable of remarkably improving bus voltage deviation
  • DC microgrid distributed autonomous coordination control method capable of remarkably improving bus voltage deviation

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Example Embodiment

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

[0059] The DC bus voltage V bus From small to Oita, from 1 to N, respectively N voltage threshold interval, 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 an odd number, where the first One 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 as long as the first voltage threshold interval D , Namely V 1 –2V D -V min =4V D , Upper limit V max The hysteresis loop width which is 2 times from the nth voltage threshold interval is 2V D , Namely V max –(V N +2V D )=4V D .

[0061] Above V D It is half the width of the hysteresis loop, whic...

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Abstract

The invention relates to a DC microgrid distributed autonomous coordination control method capable of remarkably improving bus voltage deviation, in particular to an improved distributed autonomous coordination control method based on a DBS (DC Bus Signaling) coordination control method. The method mainly comprises the steps: sampling a DC bus voltage signal and transmitting the sampled DC signalto a local controller; amplifying the sampled voltage signal according to a proposed equivalent amplification rule, and carrying out the coordination control by taking the amplified voltage signal asa judgment basis. The purpose of equivalently amplifying the voltage signal is to reduce the voltage bias of the DC bus and prevent the problem that the normal work of the system is influenced by therepeated action of the mode switching signal due to the small actual voltage threshold interval. The method solves the problem that the traditional DBS coordination control requires a large bias of the DC bus voltage, improves the bus voltage deviation, improves the power supply reliability and the power quality of a DC microgrid, and can be applied to a DC load scene with high requirements on thepower 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 ...

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Application Information

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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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