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After a detailed analysis of the dynamic processes in the HVDC converter when asymmetric faults occur in the ac system, a sequence-component model of converter based on the advanced switching functions is present. Furthermore, a linear direct method of harmonic calculation is proposed. In this method, both the effect of the harmonic interaction between the ac and dc system and the dynamic processes in the converter are considered. It is demonstrated that quantitative analysis basis for harmonic suppression, filter configuration and setting calculation of relaying can be provided by this method which is verified by comparison with the results obtained by dynamic simulation.
Date of Conference: 26-30 July 2009