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  • Kuder, ManuelUniversität Der Bundeswehr München,Bundeswehr University Munich (author)

Capacitor Voltage Balancing of a Grid-Tied, Cascaded Multilevel Converter with Binary Asymmetric Voltage Levels Using an Optimal One-Step-Ahead Switching-State Combination Approach †

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-01-13
  • MDPI AG,2022
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:dec837f2-f07d-401e-83da-9471d57ba8bd
  • https://research.chalmers.se/publication/528586URI
  • https://doi.org/10.3390/en15020575DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • This paper presents a novel capacitor voltage balancing control approach for cascaded multilevel inverters with an arbitrary number of series-connected H-Bridge modules (floating capacitor modules) with asymmetric voltages, tiered by a factor of two (binary asymmetric). Using a nearest-level reference waveform, the balancing approach uses a one-step-ahead approach to find the optimal switching-state combination among all redundant switching-state combinations to balance the capacitor voltages as quickly as possible. Moreover, using a Lyapunov function candidate and considering LaSalle's invariance principle, it is shown that an offline calculated trajectory of optimal switching-state combinations for each discrete output voltage level can be used to operate (asymptotically stable) the inverter without measuring any of the capacitor voltages, achieving a novel sensorless control as well. To verify the stability of the one-step-ahead balancing approach and its sensorless variant, a demonstrator inverter with 33 levels is operated in grid-tied mode. For the chosen 33-level converter, the NPC main-stage and the individual H-bridge modules are operated with an individual switching frequency of about 1 kHz and 2 kHz, respectively. The sensorless approach slightly reduced the dynamic system response and, furthermore, the current THD for the chosen operating point was increased from 3.28% to 4.58% in comparison with that of using the capacitor voltage feedback.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Kersten, Anton,1991Universität Der Bundeswehr München,Bundeswehr University Munich,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kersten (author)
  • Marques-Lopez, Jose LuisUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Estaller, JulianUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Buberger, JohannesUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Schwitzgebel, FlorianUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Thiringer, Torbjörn,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)thorbear (author)
  • Lesnicar, AntonUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Marquardt, RainerUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Weyh, ThomasUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Eckerle, RichardUniversität Der Bundeswehr München,Bundeswehr University Munich (author)
  • Universität Der Bundeswehr MünchenChalmers tekniska högskola (creator_code:org_t)

Related titles

  • In:Energies: MDPI AG15:21996-10731996-1073

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