An m-level active-clamped converter topology - operating principle

Busquets‐Monge, Sergio; Nicolás-Apruzzese, Joan

doi:10.1109/isie.2010.5637588

Cited by 7 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extension of the ANPC converter in order to achieve a higher number of levels can be easily done. As in the three-level case, the N-level ANPC converter has the same structure than the N-level NPC converter but again active switches are used instead the clamping diodes [6]. However, the N-level ANPC converter has the same drawbacks of the Nlevel NPC converter in terms of voltage balancing control and high number of power devices.…”

Section: Flying-capacitor Cellmentioning

confidence: 99%

Simple modulator with voltage balancing control for the hybrid five-level flying-capacitor based ANPC converter

Leon

Franquelo

Kouro

et al. 2011

2011 IEEE International Symposium on Industrial Electronics

View full text Add to dashboard Cite

Abstract-The hybrid flying-capacitor based active-neutralpoint-clamped converter is a recent multilevel converter topology with interesting properties such as high quality output voltage and easy extension to achieve a high number of levels with reduced number of power devices. The control of the flying capacitors of the three-phase converter has been previously carried out by an elaborate control technique taking advantage of the large number of redundant switching states. This paper is focused on the introduction of a simple single-phase modulator for the single-phase five-level hybrid flying-capacitor based activeneutral-point-clamped converter. The single-phase modulator can be applied to each phase of a three-phase converter without losing generality. Using this modulation technique, the dc-link capacitors and the floating capacitor voltages are controlled to their desired values. Simulation results show the good performance of the voltage control obtaining simultaneously high quality output voltages and currents.

show abstract

Section: Flying-capacitor Cellmentioning

confidence: 99%

Simple modulator with voltage balancing control for the hybrid five-level flying-capacitor based ANPC converter

Leon

Franquelo

Kouro

et al. 2011

2011 IEEE International Symposium on Industrial Electronics

View full text Add to dashboard Cite

show abstract

“…To maintain the voltage of the capacitors in the dc link, numerous redundancies are used to control the capacitors voltage. Such topology contributes to increasing the inverter output voltage levels and enhances the power quality [22, 23].…”

Section: Introductionmentioning

confidence: 99%

Active neutral point clamped converter for equal loss distribution

Taallah¹,

Mekhilef²

2014

IET Power Electronics

View full text Add to dashboard Cite

Active neutral point is the most attractive inverter topology in many applications such as a photovoltaic system because of the equal loss distribution among switches. This study presents a new single-phase five-level active neutral-point clamped converter topology. It can be applied to achieve optimal total harmonic distortion. In addition, this topology helps to obtain voltage balancing among the capacitors. An analysis of the switching state and commutation of the converter are also presented here in order to balance the power losses among the semiconductor devices. The simulation has been carried out in MATLAB SIMULINK to investigate the effectiveness of the proposed topology. Experimental results are presented to validate the proposed topology. Moreover, a comparative study has been made to show the cost-effectiveness of the proposed topology.

show abstract

“…1.15. It was first presented in [65], [66], and a proof of concept of a non-isolated buck-boost dc-dc converter using two legs of the MAC topology is carried out in [67]. The number of switches employed per converter leg is N(N − 1).…”

Section: Multilevel Active-clamped Topologymentioning

confidence: 99%

Contributions to the modulation and closed-loop control of multilevel dual-active-bridge Dc-Dc converters

Filbà Martínez

View full text Add to dashboard Cite

Galvanically-isolated bidirectional dc-dc converters (IBDCs) have recently received more attention due to its increasing use in systems requiring energy transfer between two dc networks in both directions, requiring galvanic isolation and a high voltage gain. Some of these systems are energy storage systems, vehicle-to-grid power interfaces, fuel cell energy systems, uninterruptable power supplies, high-voltage dc links for electric-energy transmission, and solid-state transformers.The most prominent IBDC, thanks to its good performance, is the dual-active-bridge (DAB) converter. It features a high power density, a wide dc-voltage gain working range, a low count of passive components, and an exceptional transformer utilization. Nevertheless, the DAB converter suffers from a significant performance deterioration when operating at conditions different from its nominal design working point. This problem has been alleviated by designing complex modulation schemes, which require a high computational effort and are highly dependent on the parasitic-component values. On the other hand, as DAB converters have been lately introduced in high-power applications, higher voltages are needed in the dc links in order to achieve reasonable efficiency values. This has led to the use of multilevel topologies on the DAB converters, mainly multilevel neutral-point-clamped (NPC) topologies. However, the little and recent literature in this topic have not fully explored the operational capabilities and performance benefits of multilevel DAB converters.The aim of this thesis is to study the viability of multilevel NPC DAB (ML-DAB) converters, where the major faced challenge is the dc-link capacitors voltage balancing. First, three particular ML-DAB converters are studied, with the same number of levels on each side; the three-level, four-level, and five-level topologies (3L-DAB, 4L-DAB, and 5L-DAB, respectively). Suitable switching sequences, modulation schemes, and control schemes are designed for the proposed ML-DAB converters. The converter switching and conduction losses are studied with three figures of merit, resulting in a set of practical solutions that define the modulation parameters and achieve satisfactory converter-performance figures. These results are then generalized to the N-level topology (NL-DAB). Finally, the feasibility of ML-DAB converters with an asymmetric number of levels is also demonstrated. Els convertidors de cc-cc bidireccionals amb aïllament galvànic (IBDCs) han rebut recentment força atenció, degut al seu ús creixent en sistemes on es requereix la transferència d'energia elèctrica entre dues xarxes de cc en ambdues direccions, a més d'aïllament galvànic i un alt guany de tensió. Alguns exemples són sistemes d'emmagatzematge d'energia elèctrica, interfícies de potència per sistemes 'Vehicle-to-Grid', sistemes de piles de combustible, sistemes d'alimentació ininterrompuda, xarxes elèctriques de cc i alta tensió i transformadors d'estat sòlid. El membre més important dins dels IBDCs, gràcies al seu bon rendiment, és el convertidor dual active bridge (DAB). Aquest presenta una alta densitat de potència, un ampli rang de guany de tensió, un nombre baix de components passius i una utilització excepcional del transformador. No obstant això, pateix d'un deteriorament significatiu del seu rendiment quan opera fora del seu punt de treball nominal. A la literatura, aquest problema s'ha alleujat proposant esquemes de modulació alternatius, que solen ser complexos, requereixen un alt esforç computacional i són altament dependents dels valors dels components paràsits del convertidor. Recentment, els convertidors DAB han estat introduïts en aplicacions d'alta potència, que requereixen tensions de bus de cc elevades, per tal d'assolir valors d'eficiència raonables. Això ha conduït a l'ús de topologies multinivell en els convertidors DAB, principalment topologies d'enclavament al punt neutre (NPC). No obstant això, la literatura recent en aquest tema és escasa i no explora completament les capacitats operatives i els potencials beneficis que els convertidors DAB multinivell poden oferir.L'objectiu d'aquesta tesi és estudiar la viabilitat dels convertidors DAB multinivell emprant toplogies NPC (ML-DAB), on el principal desafiament és la necessitat de garantir l'equilibri de les tensions als condensadors del bus de cc. En primer lloc, s'estudien tres casos particulars dels convertidors ML-DAB, on cadascun presenta el mateix nombre de nivells en cada costat. Aquests casos són les topologies de tres nivells, quatre nivells i cinc nivells (3L-DAB, 4L-DAB i 5L-DAB, respectivament). Es dissenyen seqüències de commutació, esquemes de modulació, i esquemes de control adequats per als convertidors ML-DAB proposats. Les pèrdues de conducció i commutació dels convertidors ML-DAB proposats s'estudien a partir de tres figures de mèrit. Els resultats d'aquest estudi ajuden a determinar un conjunt de solucions pràctiques per a definir els paràmetres de modulació, obtenint, a la vegada, rendiments satisfactoris. L'estudi realitzat en els tres casos particulars es generalitza al cas de la topologia d'N nivells (NL-DAB). Finalment, la viabilitat dels convertidors ML-DAB amb un nombre asimètrica de nivells també es demostra.

show abstract

An m-level active-clamped converter topology - operating principle

Cited by 7 publications

References 33 publications

Simple modulator with voltage balancing control for the hybrid five-level flying-capacitor based ANPC converter

Simple modulator with voltage balancing control for the hybrid five-level flying-capacitor based ANPC converter

Active neutral point clamped converter for equal loss distribution

Contributions to the modulation and closed-loop control of multilevel dual-active-bridge Dc-Dc converters

Contact Info

Product

Resources

About