Effect of Semiconductor Parasitic Capacitances on Ground Leakage Current in Three-Phase Current Source Inverters

Giovanni Migliazza, Emilio Carfagna, Giampaolo Buticchi, Fabio Immovilli and Emilio Lorenzani
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Giovanni Migliazza: Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, 42121 Reggio Emilia, Italy
Emilio Carfagna: Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, 42121 Reggio Emilia, Italy
Giampaolo Buticchi: Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China
Fabio Immovilli: Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, 42121 Reggio Emilia, Italy
Emilio Lorenzani: Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, 42121 Reggio Emilia, Italy

Energies, 2021, vol. 14, issue 21, 1-15

Abstract: This paper investigates the influence of power semiconductor parasitic components on the ground leakage current in the three-phase Current Source Inverter topology, in the literature called H7 or CSI7. This topology allows reducing converter conduction losses with respect to the classic CSI, but at the same time makes the topology more susceptible to the parasitic capacitances of the semiconductors devices. In the present work, a grid-connected converter for photovoltaic power systems is considered as a case study, to investigate the equivalent circuit for ground leakage current. The same analysis can be extended to applications regarding electric drives, since the HF model of electric machines is characterized by stray capacitance between windings and the stator slots/motor frame. Simulation results proved the correctness of the proposed simplified common-mode circuit and highlighted the need of an additional common-mode inductor filter in case of resonance frequencies of the common-mode circuit close to harmonics of the power converter switching frequency. Experimental results are in agreement with the theoretical analysis.

Keywords: current source inverter; photovoltaic; parasitic capacitance; common mode; ground leakage current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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