A COMMON-MODE VOLTAGE SUPPRESSION METHOD FOR H8 INVERTER CONSIDERING EFFECT OF PARASITIC CAPACITANCE

Gao Mingju; Li Shanhu; Cai Min; Liu Xu; Sun Qingguo

doi:10.19912/j.0254-0096.tynxb.2024-0354

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 614-623. DOI: 10.19912/j.0254-0096.tynxb.2024-0354

Special Topics of Academic Papers at the 93th Annual Meeting of the China Association for Science and Technology

A COMMON-MODE VOLTAGE SUPPRESSION METHOD FOR H8 INVERTER CONSIDERING EFFECT OF PARASITIC CAPACITANCE

Gao Mingju^1,2, Li Shanhu^1,2, Cai Min^1,2, Liu Xu^1,2, Sun Qingguo^1,2

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Abstract

An effective full open-circuit zero-vector modulation strategy for suppressing common-mode voltage is proposed for H8 inverter. By deriving the common-mode voltage time-domain model of H8 inverter under the effective full open-circuit zero vector, the internal relationship between the common-mode voltage and the junction capacitances of DC bus S₇ and S₈ and the parasitic capacitance of the ac output side to the ground is studied. The variation trends of common-mode voltage and system efficiency with additional parasitic capacitance value is quantitatively analyzed. In order to take into account the common-mode voltage suppression effect and system efficiency, the additional parallel capacitances selected by S₇ and S₈ is approximately 30 times the value of the parasitic capacitance, and the common-mode voltage under the effective full open-circuit zero vector is reduced to 0. The system efficiency reaches 98%, while avoiding the common-mode voltage spike caused by the dead-time effect. Finally, the effectiveness of the above method is verified by experiments.

Key words

electric inverters / pulse width modulation / vectors / common-mode voltage / parasitic capacitance / dead-time effect

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Gao Mingju, Li Shanhu, Cai Min, Liu Xu, Sun Qingguo. A COMMON-MODE VOLTAGE SUPPRESSION METHOD FOR H8 INVERTER CONSIDERING EFFECT OF PARASITIC CAPACITANCE[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 614-623 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0354

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