Electronic Science and Technology ›› 2022, Vol. 35 ›› Issue (11): 80-89.doi: 10.16180/j.cnki.issn1007-7820.2022.11.012

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Study on Fluctuation Smoothing Strategy of Flexible Grid-Connection of Microgrid

ZHANG Wenjing,CHEN Zhuo,LIU Bolin,ZHU Jiawen,HUANG Lisu   

  1. The Electrical Engineering College,Guizhou University,Guiyang 550025,China
  • Received:2021-03-23 Online:2022-11-15 Published:2022-11-11
  • Supported by:
    National Natural Science Foundation of China(51567005)


Due to the instability of generation power of distributed generation in microgrid, when microgrid and large power grid operate in parallel, it will affect the stability of large power grid system. In order to eliminate the influence of power fluctuation in microgrid on large power grid, it is necessary to improve the grid connection interface. A flexible grid connection interface is proposed to stabilize the power fluctuation in microgrid and connect the distribution network and microgrid flexibly. The interface takes the back-to-back converter as the prototype, and applies the hybrid energy storage technology to the grid connection technology to calculate the power fluctuations in the microgrid. Then, the hybrid energy storage link in the grid-connected interface is used to smooth out the power fluctuations, which eliminates the impact of microgrid power fluctuations on the distribution network power and simplifies the control mode of the micro source in the microgrid. Experiments performed on MATLAB/Simulink simulation platform prove that the flexible grid-connected interface can suppress the power fluctuations of the microgrid, and the grid-connected interface can effectively simplify the control mode in the microgrid when the microgrid operating mode is switched.

Key words: flexible grid connection, power flattening, hybrid energy storage, DC voltage follow-up control, voltage stability control, back-to-back converter, DC/DC converter, MATLAB

CLC Number: 

  • TN99