直流微电网双向AC/DC变换器鲁棒前馈控制策略研究

doi:10.16180/j.cnki.issn1007-7820.2022.06.010

Abstract

Abstract:

In view of the problem that the two-way AC/DC power converter can effectively ensure the stability of the DC microgrid bus voltage, a feedforward robust control strategy composed of LESO and sliding mode theory is proposed. By establishing the dynamic mathematical model of DC microgrid three-phase AC/DC bidirectional power converter, the third-order linear extended state observer is designed, and the observation values of third-order LESO are used in the design of sliding mode controller. The control strategy can realize feedforward control without additional current sensor and ensure that the system has good dynamic performance. The strategy can effectively reduce the implementation difficulty of sliding mode control, and significantly improve the robustness of the system. Through simulation analysis, the effectiveness of the proposed control strategy is verified.

Key words: DC microgrid, bus voltage, converter, LESO, sliding mode control, dynamic characteristic, robust control, sliding mode control

CLC Number:

TP29

WANG Xin,XU Xiang,WU Boning,HUANG Chong. Research on Robust Feedforward Control Strategy of Bidirectional AC/DC Converter for DC Microgrid[J].Electronic Science and Technology, 2022, 35(6): 64-69.

Figures/Tables 11

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Research on Robust Feedforward Control Strategy of Bidirectional AC/DC Converter for DC Microgrid

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