Abstract
The arm parameters of the upper and lower arm of modular multilevel converters (MMCs) are not always symmetric in the practical projects. In fact, there will be some differences inevitably. Under this unbalanced condition, there is an interaction between the internal circulating current and the AC side current. A theoretical analysis of MMCs under the asymmetric arm impedance conditions is carried out to find the characteristics of the AC side output current. In this case, a DC component will appear on the AC side and the expression for the bias current is achieved. The DC component will lead to a DC-bias problem on transformers. A simulation model is built with PSCAD/EMTDC, which verifies the influence on the AC side of MMCs under the asymmetric arm parameter conditions.
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