Sensorless Capacitor Voltage Balancing of a Grid-Tied, Single-Phase Hybrid Multilevel Converter with Asymmetric Capacitor Voltages using Dynamic Programming
Paper i proceeding, 2020

This paper shows a sensorless capacitor voltage balancing control approach for a grid-connected, single-phase hybrid multilevel inverter based on an NPC main stage with a voltage stiff DC-link and an arbitrary number of H-Bridge modules (capacitor modules) with asymmetric capacitor voltages. Using nearest-level control, a model predictive control (MPC) approach with a prediction horizon of one time step is chosen to find an optimal switching-state combination among the redundant switching combinations to balance the capacitor voltages as quick as possible. Using the Lyapunov stability criterion, it is shown that an offline calculated optimal switching-state sequence for each discrete output voltage level can be used to operate the inverter without using any voltage sensors for the capacitor voltages. To validate the stability of the approach, a laboratory inverter with a resistive load is operated with the offline calculated optimal switching-state sequences and it is shown that the capacitor voltages converge to their desired reference voltages.

Multilevel systems

Modular multilevel converters


Anton Kersten

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Manuel Kuder

Universität Der Bundeswehr München

Jose Luis Marques-Lopez

Universität Der Bundeswehr München

Florian Schwitzgebel

Universität Der Bundeswehr München

Torbjörn Thiringer

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Rainer Marquardt

Universität Der Bundeswehr München

Thomas Weyh

Universität Der Bundeswehr München

Richard Eckerle

Universität Der Bundeswehr München

IECON Proceedings (Industrial Electronics Conference)

Vol. 2020-October 4288-4293 9255073

46th Annual Conference of the IEEE Industrial Electronics Society, IECON 2020
Virtual; online, Singapore,




Annan elektroteknik och elektronik



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