Effective Controller Design and Circulating Current Suppression for Modular Multilevel Converters (MMCs) Using ATP-EMTP

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This paper presents the modeling, controller design and digital simulation of the modular multilevel converter (MMC) using ATP-EMTP software platform. The dc-link capacitor voltage balancing and circulating current suppression are crucial to ensure stable steady-state operation and minimize power fluctuation among the buffer inductance and the dc-link capacitors of the half-bridge chopper cells (HBCCs). The energy evolving mechanism of the MMC converter is investigated, and an effective control scheme is employed by utilizing two energy control loops, namely, the average energy controller (AEC) and the energy balancing controller (EBC). The AEC block is used to control the overall energy of the leg, and the EBC block is used to control the balance between upper and lower arms of the MMC phase-leg. To minimize the circulating current, an efficient circulating current suppression controller (CCSC) is devised using the ADALINE-based harmonic identifier. The effectiveness and validity of the control strategies are substantially confirmed by the simulation results under various operation conditions
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Multilevel Converter; Energy Balancing; Circulating Current; ADALINE; ATP-EMTP

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