Ground Fault Current Control via Voltage Source Converters using Virtual Impedances in the Zero Sequence

Mahr F, Jäger J (2023)

Publication Type: Conference contribution

Publication year: 2023

Event location: Aalborg DK

Abstract

State of the art voltage source converters (VSCs) are commonly not able to feed ground fault currents by themselves. In case of a ground fault, the zero sequence currents in VSC-fed grids are achieved by the star point connection of the upstream transformer. For example, a dedicated compensation coil connected to the transformer star point establishes the ground fault compensation for arc suppression. Thus, grids with directconnected VSCs without upstream transformers or star point facilities can only be operated with insulated star point up to now. This paper presents a VSC, which is able to control the ground fault current using a virtual impedance (VI). The VSC is taking over the function of the arc suppression coil exemplary. No transformer star point for the connection of the arc suppression coil is needed any more. The VSC emulates the characteristics of the compensation inductance in the zero sequence. It fulfils the function of the arc suppression coil. The results are validated by EMT simulations and show a promising use of direct-connected VSCs in case of ground faults.

Authors with CRIS profile

Florian Mahr Lehrstuhl für Elektrische Energiesysteme Johann Jäger Professur für Elektrische Energieversorgung

How to cite

APA:

Mahr, F., & Jäger, J. (2023). Ground Fault Current Control via Voltage Source Converters using Virtual Impedances in the Zero Sequence. In Proceedings of the European Conference on Power Electronics and Applications (EPE'23 ECCE Europe). Aalborg, DK.

MLA:

Mahr, Florian, and Johann Jäger. "Ground Fault Current Control via Voltage Source Converters using Virtual Impedances in the Zero Sequence." Proceedings of the European Conference on Power Electronics and Applications (EPE'23 ECCE Europe), Aalborg 2023.

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