This paper presents a medium-voltage wind energy conversion system with integrated storage that implements power electronics converter based on modular multilevel topology. The proposed converter has a storage system integrated into its modular cell structure. This paper analyzes the proposed topology and presents detail sizing procedure for both converter and storage system in order to meet new grid connection standards and fault ride through (FRT) requirements. In order to verify the system operation, high detail model of the converter leg is used to simulate independent power control on ac and dc sides of the converter needed for the successful implementation of the FRT control.
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Novakovic et al. (2017) studied this question.
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