Advantages for embedding DC-link decoupling capacitance in high capacity power electronic converters

Li, Guangzhuo; Ruan, Jie; Deng, Yan; He, Xiangning

doi:10.1109/compel.2018.8459925

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The stray inductance of the busbar may resonate with the dc-link capacitor, producing current harmonics and overheating issues in the capacitor (Zhang et al, 2015;Alizadeh et al, 2018;Callegaro et al, 2018;Wang et al, 2020;Niu et al, 2021;Tahir et al, 2021;Zhao et al, 2021). For dc-link of high power modular converters, non-laminated busbar is attractive owing to its large current capacity, ease of manufacturing and low cost (Liang et al, 2021); however, the adverse effects may get even worse due to its large stray inductance (Callegaro et al, 2018;Li et al, 2018;Alizadeh and Alan Mantooth, 2021). To achieve a reliable converter operation along with low cost busbar solution, it is crucial to analyze the relationship between the busbar stray inductance and the resonance that can dictate the busbar optimization (Meng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Unit Partition Resonance Analysis Strategy for Impedance Network in Modular Power Converters

Tahir

Hu²,

Liang³

et al. 2022

Front. Energy Res.

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In modular power converters, the dc-link capacitor has the highest failure rate due to thermal stress, reducing system performance and reliability. Current harmonics are one of the prominent causes of thermal stress on the dc-link capacitor that may get instigated by the resonance between the dc-link capacitor and stray inductance of the busbar. The dc-link capacitor current harmonics mitigation through busbar design optimization has not been reported. The challenge lies in analyzing the profound resonance characteristics of high order dc-link busbar impedance network as no insightful information can be obtained from impedance analyzers. This paper features a new strategy for high power modular converters that splits the high order dc-link busbar impedance network into corresponding lower-order sub-units. Then, the required relationship between resonating components and corresponding resonance frequencies is attained by exploiting the structural symmetry of the standard modular power unit as well as the inheritance relationship between sub-circuit units and the combined network. Finally, leveraging the derived resonant frequencies expressions, busbar structure is optimized, and up to 23% reduction in capacitor RMS current is achieved. Simulation and experimental results are provided to validate the efficacy of the proposed analysis method. The in-depth theoretical study featured in this paper can dictate not only the busbar design optimization but also a key to improve capacitor lifetime and reliability of the system.

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