Unidirectional Asymmetric Hybrid Nine-Leg Rectifier With Floating H-Bridge Capacitors

Felinto, Alan S.; Jacobina, Cursino B.; Fabricio, Edgard L. L.; Melo, Victor F. M. B.; Mello, Joao Paulo Ramos Agra; Carlos, Gregory Arthur de Almeida

doi:10.1109/tpel.2020.3009605

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…From ( 26), it can be deduced that DC-link voltage is affected by S 2 and S 4 on-off state. In order to avoid affecting the DC-link voltage and keep it constant at the reference, based on (26), the following equation should be satisfied:…”

Section: Control Strategy To Balance the Flying Capacitorsmentioning

confidence: 99%

“…Several multilevel unidirectional topologies have been proposed in the literature. [24][25][26] However, in cases where the loss distribution among devices is not equal, additional hardware circuits are required to balance the DC-link capacitor voltages. Cheng et al 27 proposed a unidirectional three-phase multilevel rectifier with transformerless (either LF or HF transformer isolation) system.…”

Section: Introductionmentioning

confidence: 99%

“…Itoh et al 23 proposed a unidirectional inverter that uses half the number of switches in comparison to the NPC and FC types. Several multilevel unidirectional topologies have been proposed in the literature 24–26 . However, in cases where the loss distribution among devices is not equal, additional hardware circuits are required to balance the DC‐link capacitor voltages.…”

Section: Introductionmentioning

confidence: 99%

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A novel bridgeless flying capacitor multilevel rectifier

Cheng

Wang

et al. 2023

Circuit Theory & Apps

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SummaryA novel transformerless three‐phase unidirectional bridgeless flying capacitor (UBFC) rectifier for medium‐voltage and high‐voltage applications is presented in this paper. The rectifier consists of three single‐phase rectifiers in wye connection; the DC outputs of the three single‐phase rectifiers are connected in parallel to provide a high common DC‐link bus, which makes it convenient to connect with neutral point clamped (NPC) or flying capacitor (FC) multilevel inverters. To avoid phase‐to‐phase current circulation, an additional inductor and diode are added to each single‐phase rectifier. Compared with conventional bidirectional multilevel converters, only half IGBTs are used, the voltage stress is lower, and the line‐frequency transformers are no longer required, which makes the proposed rectifier has a series of advantages such as reduced cost, simplified control complexity, increased reliability and improved overall efficiency. The basic operating principle of the proposed rectifier in continuous conduction mode is discussed; an improved carrier‐based level‐shifted pulse‐width modulation (PWM) method integrated with voltage balancing and the double closed‐loop control strategy are proposed to achieve more voltage levels and keep the flying capacitors in balance. The feasibility of the proposed rectifier is verified by the simulation and experimental results.

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Section: Control Strategy To Balance the Flying Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A novel bridgeless flying capacitor multilevel rectifier

Cheng

Wang

et al. 2023

Circuit Theory & Apps

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show abstract

“…Several multilevel unidirectional topologies have been proposed in the literature. 21,22,23 However, in distribution of losses among the devices is not equal, extra hardware circuitry is required to balance the DC-link capacitor voltages. Cheng H. et al 24 proposed a unidirectional three-phase multilevel rectifier with transformerless (either LF or HF transformer isolation) system.…”

Section: Introductionmentioning

confidence: 99%

A novel bridgeless flying capacitor multilevel rectifier

Cheng

Wang

et al. 2023

Preprint

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A novel transformerless three-phase unidirectional bridgeless flying capacitor (UBFC) rectifier for medium-voltage and high-voltage applications is presented by this paper. The rectifier consists of three single-phase rectifiers in wye connection, the DC outputs of the three single-phase rectifiers are connected in parallel to provide a high common DC-link bus which makes it convenient to connect with NPC or FC multilevel inverters. To avoid phase to phase current circulation, an additional inductor and diode are added to each single-phase rectifier. Compared with conventional bidirectional multilevel converters, only half IGBTs are employed with lower voltage stress, line-frequency transformers are no longer be required, which makes the proposed rectifier has a series of advantages such as reduced cost, simplified control complexity, increased reliability and improved overall efficiency. The basic operating principle of the proposed rectifier in continuous conduction mode is discussed, an improved carrier-based level-shifted PWM modulation method integrated with voltage balancing and the double closed-loop control strategy are proposed to achieve more voltage levels and keep the flying capacitors in balance. The feasibility of proposed rectifier is verified by the simulation as well as experimental results.

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Implementation of Nine-Switch converter to PV solar array operating with different loads

Kumar

Agarwal

2022

Materials Today: Proceedings

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Unidirectional Asymmetric Hybrid Nine-Leg Rectifier With Floating H-Bridge Capacitors

Cited by 11 publications

References 26 publications

A novel bridgeless flying capacitor multilevel rectifier

A novel bridgeless flying capacitor multilevel rectifier

A novel bridgeless flying capacitor multilevel rectifier

Implementation of Nine-Switch converter to PV solar array operating with different loads

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