Enhanced Equivalent Model of the Modular Multilevel Converter


This paper introduces an enhanced equivalent model of the 0.5-bridge symmetrical monopole modular multilevel converter (MMC) topology for the analyses of the electromagnetic transients. Compared with the prevailing MMC models, the proposed model reduces the simulation computational time while not compromising accuracy, and contrary to the existing models, it provides accurate representation of the MMC behavior with respect to the dc-side fault. This paper additionally evaluates and verifies the accuracy of the proposed equivalent model below varied operating conditions, that is, startup, dc-side pole-to-pole fault, and ac-facet three-section-to-ground fault. The study results indicate that: one) in distinction to the present equivalent models, the proposed enhanced model accurately represents the MMC underneath varied operating conditions; 2) the implemented simplifications to the model do not adversely have an effect on the accuracy of the simulation results; and three) a reduced-level approximated model of the MMC is additionally adequately accurate for defense studies.

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