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Multi-agent self-adaptive drop consistency coordination control method and apparatus for direct current microgrid

A DC micro-grid and multi-agent technology, applied in the field of DC micro-grid, can solve the problems of DC bus voltage collapse, power distribution accuracy reduction, DC micro-grid system power distribution and voltage stability, etc., to improve The effect of voltage quality

Active Publication Date: 2015-12-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Equation (2) shows that when ignoring the line impedance or R di >>R i , (i=1,2), the precise distribution of active power between DC-DC converters can be realized by adjusting the virtual resistance of the droop control, namely But in the actual DC microgrid, the line impedance R i can not be completely ignored, only when In order to eliminate the power allocation error and achieve accurate power allocation, however if R di When the value of is relatively large, it will directly affect the stability of the DC system
[0012] From the above analysis, it can be seen that the line impedance and the virtual impedance of DC droop control have a great influence on the power distribution and voltage stability of the DC microgrid system
When considering the line impedance, the output voltage of each DC-DC converter is not exactly the same, which may lead to inaccurate load power distribution
If a simple fixed virtual impedance is adopted, when the value of the virtual impedance is large, although it can meet the requirements of precise power distribution, it may lead to the collapse of the DC bus voltage; if the value of the virtual impedance is small, although the DC voltage stability can be satisfied requirements, but the accuracy of power distribution will be greatly reduced

Method used

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  • Multi-agent self-adaptive drop consistency coordination control method and apparatus for direct current microgrid
  • Multi-agent self-adaptive drop consistency coordination control method and apparatus for direct current microgrid
  • Multi-agent self-adaptive drop consistency coordination control method and apparatus for direct current microgrid

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Experimental program
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Embodiment 1

[0051] A DC microgrid multi-agent adaptive drooping consistency coordination control method, the control method comprising the following steps:

[0052] 101: Apply the obtained multi-agent consensus protocol to the multi-agent structure of the virtual navigator of the DC microgrid, and obtain a DC microgrid consensus protocol based on the neighbor set of the virtual navigator agent;

[0053] 102: Obtain the non-linear error consistency control protocol of the DC microgrid system through the DC microgrid consistency protocol based on the virtual navigator agent neighbor set;

[0054] 103: Control the DC microgrid system through the nonlinear consistency control protocol and proportional complex integral, obtain the virtual impedance of adaptive dynamic change, and control the output voltage of the DC-DC converter.

[0055] Wherein, before step 101, the control method also includes:

[0056] Construct the multi-agent structure of the DC micro-grid virtual navigator;

[0057] The...

Embodiment 2

[0062] The scheme in embodiment 1 is described in detail below in conjunction with specific calculation formulas, examples, and accompanying drawings, see the following description for details:

[0063] 201: Construct a multi-agent structure of a DC microgrid virtual navigator;

[0064] see figure 2 , according to the characteristics of each distributed power source in the DC microgrid, a virtual navigator multi-agent structure of the DC microgrid system is established: the rated expected value of the DC microgrid system is used as a virtual navigator agent; A DC distributed power source and its controller are used as a distributed power generation agent (DGAgent). Each DGAgent follows the state of the virtual navigator agent, and under the action of the consensus control protocol, through the interaction and information exchange between agents, the consensus is finally achieved.

[0065] 202: Obtain the multi-agent consensus protocol according to the multi-agent structure ...

Embodiment 3

[0098] Below in conjunction with specific examples, the scheme in embodiment 1, 2 is carried out feasibility verification, see the following description for details:

[0099] In order to verify the correctness and feasibility of this method, a DC microgrid simulation model is built on the Matlab / Simulink platform, and a comparative analysis is carried out under traditional control and this method.

[0100] see Figure 6 , this method establishes an independent DC micro-grid system in which three DC micro-sources operate in parallel, and takes the independent DC micro-grid system as a simulation system. In the simulation system, the structure of each DC-DC converter is the same, but its rated capacity is different. The rated capacity of DC micro-power DG1 is 3kW, the rated capacity of DC micro-power DG2 is 4kW, and the rated capacity of DC micro-power DG3 is 9kW; The reference value of the DC bus voltage in the simulation system is 560V, and the allowable voltage deviation is ...

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Abstract

The invention discloses a multi-agent self-adaptive drop consistency coordination control method and apparatus for a direct current microgrid. The method comprises: by applying a multi-agent consistency protocol into a direct current microgrid virtual navigator multi-agent structure, obtaining a direct current microgrid consistency protocol based on a virtual navigator agent neighbor set; obtaining a non-linear error consistency control protocol of a direct current microgrid system through the direct current microgrid consistency protocol based on the virtual navigator agent neighbor set; controlling the direct current microgrid system through the non-linear error consistency control protocol and a proportional complex integral to obtain self-adaptive dynamically changed virtual impedance and output voltage for controlling a DC-DC converter. The apparatus comprises a first obtaining module, a second obtaining module, a third obtaining module, an establishing module and a fourth obtaining module. According to the method and the apparatus, the virtual impedance of the direct current microgrid drop control can be dynamically adjusted in real time, the busbar voltage of the direct current microgrid can be kept to be close to a rated value, and the voltage quality of the direct current microgrid system is improved.

Description

technical field [0001] The invention relates to the field of DC microgrids in new energy power systems, in particular to a DC microgrid multi-agent self-adaptive droop consistency coordination control method and device. Background technique [0002] The microgrid can effectively integrate various distributed power generation technologies, providing an effective technical approach for the large-scale application of new energy and renewable energy distributed power generation. With the increase in the types and quantities of distributed power sources, the popularity of DC loads, and the complexity and variety of distribution network structures, it is difficult for AC micro-grids to fully meet the growing demand for power supply and consumption. In order to ensure the efficiency of new energy and renewable energy Using DC microgrid technology to improve the power quality and power supply reliability of the DC microgrid system, and to better meet the diversified power needs of u...

Claims

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Application Information

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IPC IPC(8): H02J1/10
Inventor 李鹏王玉龙于航赵波周金辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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