柔性接入微电网的小信号建模

doi:10.16180/j.cnki.issn1007-7820.2023.03.004

Abstract

Abstract:

In view of the problem that the traditional PCC hard switch cannot actively adjust the power flow, the back-to-back converters are used to replace the traditional PCC hard switch to flexibly interconnect the distribution network and microgrid, so as to facilitate the coordinated control between them. In order to analyze the stability of the system and consider the different number of distributed generators in microgrid of different scales, a microgrid small signal state space model framework with N distributed generators connected through back-to-back converter is established. The eigenvalue analysis is carried out using MATLAB, and the key parameters affecting the stability and dynamic performance of microgrid are determined. Finally, a microgrid flexible grid connection operation model based on droop control is built on PSCAD / EMTDC platform. The established small signal model is combined with the built simulation model, and the simulation is carried out under multiple working conditions to verify the correctness of the modeling, analysis and conclusion.

Key words: microgrid, distribution network, back to back converter, small signal model, eigenvalue analysis, droop control, flexible interconnection, system stability

CLC Number:

TP273

LU Hongwen,YUAN Xufeng,CHEN Ruijie,LI Yulong. Small Signal Modeling of Flexible Interconnected Microgrid[J].Electronic Science and Technology, 2023, 36(3): 21-28.

Figures/Tables 11

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Small Signal Modeling of Flexible Interconnected Microgrid

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