Generalized state-space modeling for m level diode-clamped multilevel converters

Abstract

Multilevel power converter structures have been introduced as the solutions for high power high voltage applications and also for grid interface connection of renewable energy sourcessystems, where they have several advantages, namely low distortion voltages and currents, low switching losses resulting in higher efficiency. As a consequence of the increasing interest on multilevel converter applications, accurate modelsof these power converters are essential for computer simulation studies. This paper presents a systematic modeling approach suitable to obtain generalized state-space models for m level diode-clamped multilevel converters supplying AC loads. In particular, for m=5, the proposed modelis compared to the corresponding model using generalpurpose Simulink blocks and SimPowerSystems toolbox.