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Inherently Decoupled Dc-Link Capacitor Voltage Control of Multilevel Neutral-Point-Clamped Converters
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  • Gabriel Garcia-Rojas ,
  • Sergio Busquets-Monge ,
  • Robert Griñó ,
  • José M. Campos-Salazar
Gabriel Garcia-Rojas
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Sergio Busquets-Monge
Universitat Politecnica de Catalunya

Corresponding Author:[email protected]

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Robert Griñó
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José M. Campos-Salazar
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Abstract

This letter derives and discusses the superiority of a simple dc-link capacitor voltage control configuration for multilevel neutral-point-clamped converters with any number of levels. The control involves n−2 control loops regulating the difference between the voltage of neighbor capacitors. These control loops are inherently decoupled; i.e., they are independent and the control action of one loop does not affect the others. The good performance of such control is confirmed through simulations and experiments.