CONTROL STRATEGY OF PARALLEL CONVERTERS IN DC MICROGRID BASED ON PASSIVITY

Zhang Zehua; Song Guiying; Hou Mingxuan; Yang Bowei; Zhang Xiaolu; Liu Chang

doi:10.19912/j.0254-0096.tynxb.2021-0539

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 501-507. DOI: 10.19912/j.0254-0096.tynxb.2021-0539

CONTROL STRATEGY OF PARALLEL CONVERTERS IN DC MICROGRID BASED ON PASSIVITY

Zhang Zehua^1,2, Song Guiying^1,2, Hou Mingxuan³, Yang Bowei^1,2, Zhang Xiaolu⁴, Liu Chang^1,2

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Abstract

Aiming at the stability and coordination of DC microgrid with mixed load formed by renewable energy aggregation, a new control algorithm combining passive control and improved nonlinear disturbance observer feedforward compensation is proposed, which not only eliminates the influence of constant power load on DC microgrid, but also improves the system robustness, Then the line impedance compensation is used to improve the shunt accuracy and realize no voltage deviation. The research uses Matlab/Simulink to build a parallel DC-DC converter, simulation model for verification. By comparing the traditional passive control and proportional integral regulation passive control, it is shown that the proposed control strategy suppresses the influence of constant power load and line impedance. Finally, the effectiveness of the strategy was verified on the Opal-RT semi-physical experiment platform.

Key words

microgrids / renewable energy / DC-DC converters / control algorithm / robustness / voltage without deviation

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Zhang Zehua, Song Guiying, Hou Mingxuan, Yang Bowei, Zhang Xiaolu, Liu Chang. CONTROL STRATEGY OF PARALLEL CONVERTERS IN DC MICROGRID BASED ON PASSIVITY[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 501-507 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0539

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