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 †

Kuder, ManuelUniversität Der Bundeswehr München,Bundeswehr University Munich (författare)

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.

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

Av författaren/redakt...: Kuder, Manuel; Kersten, Anton, ...; Marques-Lopez, J ...; Estaller, Julian; Buberger, Johann ...; Schwitzgebel, Fl ...; visa fler...; Thiringer, Torbj ...; Lesnicar, Anton; Marquardt, Raine ...; Weyh, Thomas; Eckerle, Richard; visa färre...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Reglerteknik

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Annan elektrotek ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.