• Corpus ID: 237372938

Analytic estimation of the MMC sub-module capacitor voltage ripple for balanced and unbalanced AC grid conditions

  title={Analytic estimation of the MMC sub-module capacitor voltage ripple for balanced and unbalanced AC grid conditions},
  author={Daniel Westerman Spier and Eduardo Prieto-Araujo and Oriol Gomis-Bellmunt and Joaquim L{\'o}pez-Mestre},
In this paper, a mathematical expression to define the maximum and minimum voltage ripples of the modular multilevel converter (MMC) sub-module (SM) capacitors is proposed. Using the arm averaged model of the MMC, the instantaneous power for the upper and lower arms of the converter is obtained, giving the basis to describe the instantaneous energy of the arms. To calculate the SM capacitors peak voltage values, it is required to obtain an analytic expression for the maximum and minimum energy… 

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