RESEARCH ON UNIFIED ACTIVE DAMPER APPLIED TO HARMONIC AMPLIFICATION CONTROL

Li Fei; Liu Mengtao; Zhang Xing; Ma Mingyao

doi:10.19912/j.0254-0096.tynxb.2021-0323

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (10) : 518-523. DOI: 10.19912/j.0254-0096.tynxb.2021-0323

RESEARCH ON UNIFIED ACTIVE DAMPER APPLIED TO HARMONIC AMPLIFICATION CONTROL

Li Fei, Liu Mengtao, Zhang Xing, Ma Mingyao

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Abstract

In the high permeability grid environment, the multi-inverter grid-connected system is more prone to harmonic amplification or even instability. Many scholars are committed to alleviating this problem by parallel active damper, but it is not easy to realize the virtual of small impedance and can not effectively suppress the amplification of grid background noise. In view of the above shortcomings, a unified active damper is proposed to make up for the shortcomings of the parallel active damper. Firstly, based on the impedance model, the harmonic amplification mechanism of the electrical network coupling system of multi-inverter under weak network is analyzed, and the reasons of the harmonic amplification and even instability of the system, the harmonic source of the system and underdamping characteristics is clarified. Secondly, the mechanism and shortcomings of parallel impedance damper to solve the above problems are introduced. Thirdly, a unified active damper combining series-parallel impedance in the virtual harmonic segment of the grid-connected point is proposed to solve the problem of harmonic amplification of the system and to improve the quality of the grid-connected current. Finally, RT-LAB HIL simulation platform is built to verify the effectiveness of the proposed scheme.

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Li Fei, Liu Mengtao, Zhang Xing, Ma Mingyao. RESEARCH ON UNIFIED ACTIVE DAMPER APPLIED TO HARMONIC AMPLIFICATION CONTROL[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 518-523 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0323

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