As the number of DC transmission system increases, more DC lines are constructed in close proximity to existing AC transmission line. This paper deals with AC coupling effect on DC transmission line of Modular Multilevel Converter (MMC) based HVDC system due to neighboring AC lines. Based on a decoupled control of MMC, the operation of MMC is investigated with analytic expression. Furthermore, a new DC bus current controller is proposed to mitigate this effect. By applying the proposed controller, MMC-HVDC system can operate without any interference from the AC coupling effect. The effectiveness of the proposed controller is demonstrated through both full-scale simulation and scaled experimental studies.
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Lee et al. (2024) studied this question.
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