Abstract：Interactions between second harmonic quantities on the AC side of the converter and fundamental frequency quantities on the DC side of the converter will lead to a type of harmonic instability. The instability can be reinforced by saturation of the converter transformers.the generation mechanism of transformer core saturation instability and the impedance/frequency characteristics of the AC and DC system are researched . An equivalent circuit of core saturation instability is established and saturation stability factor is derived by the harmonic transfer matrix. The paper presents an analysis which can be used to predict where core saturation instability is likely to occur. The results are confirmed by using the digital transients simulation program PSCAD/EMTDC.
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2013, Vol. 28 
