RESEARCHON IMPROVED DROOP CONTROL STRATEGYOF DC MICROGRID BASED ON SUPERIMPOSED FREQUENCY

Xue Yang; Huang Xincao; Xi Dongxiang; Chen Yuefan; Ding Zilong

doi:10.19912/j.0254-0096.tynxb.2021-0248

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (9) : 461-467. DOI: 10.19912/j.0254-0096.tynxb.2021-0248

RESEARCHON IMPROVED DROOP CONTROL STRATEGYOF DC MICROGRID BASED ON SUPERIMPOSED FREQUENCY

Xue Yang, Huang Xincao, Xi Dongxiang, Chen Yuefan, Ding Zilong

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Abstract

This paper proposes an improved droop control strategy for DC microgrid based on superimposed frequency. First, the AC voltage is superimposed on the output voltage of the converter to construct the droop characteristics between the AC voltage frequency and the output current. At the same time, the reactive power generated by the AC voltage is used to adjust the output voltage of each DG converter to achieve accurate current distribution; Then, through the introduction of virtual resistance and voltage secondary compensation measures, the bus voltage is restored and the system stability is improved. This control strategy does not require a communication network, and effectively improves the plug-and-play performance of the microgrids. Finally, the feasibility and effectiveness of the control strategy are verified through simulation.

Key words

microgrids / improved droop controls / distributed generators / virtual resistance

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Xue Yang, Huang Xincao, Xi Dongxiang, Chen Yuefan, Ding Zilong. RESEARCHON IMPROVED DROOP CONTROL STRATEGYOF DC MICROGRID BASED ON SUPERIMPOSED FREQUENCY[J]. Acta Energiae Solaris Sinica. 2022, 43(9): 461-467 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0248

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