Analysis of the high-frequency oscillation characteristics of a multi-port converter with an AC link

WEI Shusheng; ZHAO Zhengming; WEN Wusong; LI Kai; YUAN Liqiang; CAI Weiqian

doi:10.16511/j.cnki.qhdxxb.2020.21.009

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (9) : 751-762. DOI: 10.16511/j.cnki.qhdxxb.2020.21.009

ELECTRICAL ENGINEERING

Analysis of the high-frequency oscillation characteristics of a multi-port converter with an AC link

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Abstract

High-frequency links based on modular multi-active bridges (MMAB) are useful for high power multi-port converters since they are modular, efficient and isolate the various ports. High-frequency AC buses have intrinsic oscillations that do not occur in DC buses which increase the converter losses and make the system less safe. Also, oscillations in one module affect the operations of other modules connected to the common AC bus. This study modeled two kinds of converters with each having two modules to study the effects of the high-frequency oscillations in the AC-link in an MMAB. The frequency domain analysis method was then used to investigate the relationship between the oscillations and the resonant tank parameters, including the stray parameters of the high-frequency transformer (HFT) and the stray capacitance of the switching devices. The results showed the key factors leading to the oscillations for both the uncontrolled mode and the controlled mode. Tests were conducted for the two modes and for switching between the two modes. The analytical results are verified by experimental data which would lay a foundation to reduce the oscillations in MMAB in the future.

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AC link bus / modular multi-active bridge (MMAB) / high-frequency oscillation / stray parameters

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WEI Shusheng, ZHAO Zhengming, WEN Wusong, LI Kai, YUAN Liqiang, CAI Weiqian. Analysis of the high-frequency oscillation characteristics of a multi-port converter with an AC link[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(9): 751-762 https://doi.org/10.16511/j.cnki.qhdxxb.2020.21.009

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