Determining the minimal decoupling capacitor in a railway traction inverter using optimization

Andressa Nakahata Nakahata Medrado (1) , Jean-Michel Guichon (2) , Pierre-Olivier O Jeannin (1) , Jean-Luc Schanen , Emmanuel Batista , Guillaume Desportes

1 G2Elab-EP - G2Elab-Electronique de puissance
2 G2Elab-MAGE - G2Elab-Modèles, Méthodes et Méthodologies Appliqués au Génie Electrique

This paper aims determining the minimum decoupling capacitor Cdec for a railway traction inverter. It is defined when any increase of its value does not decrease the overvoltage at turn off anymore. A simple generic model is deduced from a full understanding of the switching cell behavior, including the effect of all stray inductances and all interactions within the switching cell. This model is used in an optimization process in order to obtain directly the minimal value of Cdec. The methodology is validated in comparison with time simulation, as well as using experimental results. It has been used to analyze the impact of the switching cell parameters on the minimum value of Cdec: switching speed, stray inductances and additional resistance have been considered.

Domaines: Sciences de l'ingénieur [physics]

Andressa Nakahata Nakahata Medrado, Jean-Michel Guichon, Pierre-Olivier O Jeannin, Jean-Luc Schanen, Emmanuel Batista, et al.. Determining the minimal decoupling capacitor in a railway traction inverter using optimization. IEEE Transactions on Industry Applications, 2021, 57 (6), pp.6318-6326. ⟨10.1109/TIA.2021.3114128⟩. ⟨hal-03564746⟩