Stability Analysis of Back-To-Back Converter with Bidirectional Power Flow

Yuxia JIANG; Yanjun TIAN; Yonggang LI

doi:10.12204/j.issn.1000-7229.2021.07.009

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Electric Power Construction ›› 2021, Vol. 42 ›› Issue (7) : 73-82. DOI: 10.12204/j.issn.1000-7229.2021.07.009

Smart Grid

Stability Analysis of Back-To-Back Converter with Bidirectional Power Flow

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Abstract

As the key component of regional power grid interconnection, the stability of back-to-back converters is an important prerequisite to ensure the stable operation of regional power grids. In this paper, the stability of back-to-back converter with bidirectional power flow is studied mainly from the perspective of the DC terminal impedance of the converter. The results show that the stability of the back-to-back converter is better when power reverses. To alleviate the stability problem of the back-to-back converter caused by bidirectional power flow, the DC current inner loop is introduced into the inverter to reshape the AC/DC impedance of the inverter, which makes the DC terminal input impedance change from the original negative impedance in the low frequency band to the inductive impedance characteristics, so as to improve the stability margin of the back-to-back converter. Finally, the model of back-to-back converter is established in the Matlab/Simulink simulation platform for simulation verification, and the results verify the feasibility of the theoretical analysis and the proposed control scheme.

Key words

back-to-back converter / power flowing direction / impedance reshaping / DC current / stability.

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Yuxia JIANG , Yanjun TIAN , Yonggang LI. Stability Analysis of Back-To-Back Converter with Bidirectional Power Flow[J]. Electric Power Construction. 2021, 42(7): 73-82 https://doi.org/10.12204/j.issn.1000-7229.2021.07.009

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