Circulating Net Currents in Meshed Bipolar DC Distribution Grids due to Asymmetrical Line Resistance

Conference paper (2017)

Authors

Elisabeth Vandeventer External organisation

L.J. Mackay DC systems, Energy conversion & Storage -

L.M. Ramirez Elizondo DC systems, Energy conversion & Storage -

P. Bauer DC systems, Energy conversion & Storage -

Research Group

DC systems, Energy conversion & Storage () (TU Delft)

Protection DC distribution grid Bipolar Ground fault Circulating net current Meshed

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Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

This article describes the circulating current phenomenon that takes place in bipolar, meshed DC distribution grids. A difference in resistance between the conductor changes the distribution of the current on the conductors. This provokes a net current to flow, which is in turn measured by the residual current protection scheme, used to detect and isolate ground faults in the system, even though there is no fault in the system. Due to the circulating tendency of this net current, the operation of the protection scheme can be prevented in such a case by the addition of a clever communication system.

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