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Analysis of VSC-based HVDC system under DC faults

Rafferty, John and Morrow, D John and Xu, Lie (2013) Analysis of VSC-based HVDC system under DC faults. 39th Annual Conference of the IEEE Industrial Electronics Society IECON 2013. 459 - 464. ISSN 1553-572X

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Abstract

This paper analyzes the behavior of a Voltage Source Converter Based HVDC system under DC cable fault conditions. The behavior of the HVDC system during a permanent line-to-earth fault is analyzed, outlining the systems configuration and behavior at each stage of the fault timeline. Operation of the proposed system under a single earthing configurations, i.e. Converter (solid) earthed/AC transformer unearthed, was analyzed and simulated, with particular attention paid to the converters operation. It was observed that the development of potential earth loops within the system as a result of DC line-to-earth faults leads to substantial overcurrent and results in system configuration oscillation.