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

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...

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

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