Abstract
This paper proposes a new principle of traveling wave differential protection of HVDC transmission line. By analyzing the relationship between the forward traveling wave current and the backward traveling wave current on the line, the differential criterion is proposed by using the measured value and calculated value of the same side current. This criterion eliminates the unbalanced current caused by the attenuation of the current amplitude in the long transmission line in theoretically, so the unbalanced current is small and the sensitivity is higher than conventional differential protection. The results from theoretical analysis and simulation show the proposed traveling wave differential protection can correctly distinguish whether the fault is internal or external and is suitable for the backup protection of HVDC transmission line.
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