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Capacitor Voltage B...
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 †
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- Kuder, Manuel (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Kersten, Anton, 1991 (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich,Chalmers tekniska högskola,Chalmers University of Technology
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- Marques-Lopez, Jose Luis (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Estaller, Julian (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Buberger, Johannes (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Schwitzgebel, Florian (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Thiringer, Torbjörn, 1966 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Lesnicar, Anton (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Marquardt, Rainer (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Weyh, Thomas (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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- Eckerle, Richard (author)
- Universität Der Bundeswehr München,Bundeswehr University Munich
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(creator_code:org_t)
- 2022-01-13
- 2022
- English.
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In: Energies. - : MDPI AG. - 1996-1073 .- 1996-1073. ; 15:2
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Abstract
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- 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
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Modular multilevel converters
- Sensorless control
- Multilevel systems
- Total harmonic distortion
- Power supplies
Publication and Content Type
- art (subject category)
- ref (subject category)
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Kuder, Manuel
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Kersten, Anton, ...
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Marques-Lopez, J ...
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Estaller, Julian
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Buberger, Johann ...
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Schwitzgebel, Fl ...
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Thiringer, Torbj ...
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Lesnicar, Anton
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Marquardt, Raine ...
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Weyh, Thomas
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Eckerle, Richard
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- ENGINEERING AND TECHNOLOGY
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and Electrical Engin ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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Energies
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Chalmers University of Technology