Voltage Source Multilevel Inverters With Reduced Device Count: Topological Review and Novel Comparative Factors

Salem, Ahmed; Khang, Huynh Van; Robbersmyr, Kjell G.; Norambuena, Margarita; Rodríguez, José

doi:10.1109/tpel.2020.3011908

Cited by 194 publications

(73 citation statements)

References 160 publications

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“…However, the topologies are summarized based on three categories, i.e., symmetrical, asymmetrical, and modified. In [46], another classification of RSC-MLIs topologies is presented based on number of phases, presence of transformer, number of dc sources, and voltage ratio of dc sources only. On the other hand, in the proposed paper the categorization is carried out by considering either the motivating factor behind the development of the topology or its key contributing features.…”

Section: Introductionmentioning

confidence: 99%

A Survey on Reduced Switch Count Multilevel Inverters

Vemuganti¹,

Sreenivasarao

Ganjikunta

et al. 2021

IEEE Open J. Ind. Electron. Soc.

123

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An efficient and cost-effective power converter is a pre-requisite for the modern power applications. With the evolvement of matured medium power self-commutated switching devices, multilevel inverters (MLIs) are emerged as a promising solution for high-power medium-voltage applications. Though, MLIs are performing a promising role in industrial applications, their high device count, size, cost and control complexity have restricted their market penetration. To address the disadvantages of MLIs, researchers are continuously contributing to new generation topologies under the name of reduced switch count (RSC) MLIs. From the past decade, numerous RSC-MLIs topologies have been reported for various applications. Therefore, this paper presents a comprehensive review and classification of RSC-MLI topologies, in terms of their structure, features, limitations, suitability and selection for specific applications..

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Section: Introductionmentioning

confidence: 99%

A Survey on Reduced Switch Count Multilevel Inverters

Vemuganti¹,

Sreenivasarao

Ganjikunta

et al. 2021

IEEE Open J. Ind. Electron. Soc.

123

View full text Add to dashboard Cite

show abstract

“…As it was mentioned, the main problem with the classic configuration is the large transformer; hence, other works have tried to stay away from using it [14][15][16][17]. Thus, transformerless alternatives have been considered.…”

Section: Introductionmentioning

confidence: 99%

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

et al. 2021

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Cascaded multilevel converters based on medium-frequency (MF) AC-links have been proposed as alternatives to the traditional low-voltage inverter, which uses a bulky low-frequency transformer step-up voltage to medium voltage (MV) levels. In this paper, a three-phase cascaded DC-AC-AC converter with AC-link for medium-voltage applications is proposed. Three stages integrate each DC-AC-AC converter (cell): a MF square voltage generator; a MF transformer with four windings; and an AC-AC converter. Then, k DC-AC-AC converters are cascaded to generate the multilevel topology. This converter’s topological structure avoids the per-phase imbalance; this simplifies the control and reduces the problem only to solve the per-cell unbalance. Two sets of simulations were performed to verify the converter’s operation (off-grid and grid-connected modes). Finally, the papers present two reduced preliminary laboratory prototypes, one validating the cascaded configuration and the other validating the three-phase configuration.

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“…If the sources are of the same DC value, then the structure is symmetrical; else, it is asymmetrical. The conventional NPC and FC topologies employ symmetrical sources and require a large number of switches and capacitors, and is therefore sometimes referred to as silicone grave in the industry when 5 or 7 level structures are discussed [6], [7]. For instance a 7-level NPC will require 12 switches, 10 diodes and 6 capacitors; 7-level FC will require 12 switches and 6 capacitors; and, CHB will require 12 switches and 3 DC sources.…”

Section: Introductionmentioning

confidence: 99%

11-Level Operation With Voltage-Balance Control of WE-Type Inverter Using Conventional and DE-SHE Techniques

et al. 2021

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This article presents an 11-level operation of the WE (Wee)-Type inverter. The topology employs a single DC-source, has a reduced number of components, and exhibits a boosting capability. A voltage balancing algorithm is proposed where the inverter's redundant states are employed to maintain the auxiliary DC-link voltage. It is shown that with the control algorithm, the link voltage is preserved at half the primary DC-link voltage, and the 11-level operation is possible for any load. The presented 11-level WEtype structure is also compared with recent 11-level structures and has a lowest cost factor. Two modulation strategies verify the 11-level operation of the inverter: first, a modified nearest level control (MNLC) with the usage of both zero states is developed; and, second, selective harmonic elimination (SHE) is employed, where the angles are generated using a differential evolution (DE) technique. The maximum efficiency of the inverter is 97.55 %. The performance of the inverter is validated in MATLAB/Simulink and on the hardware-in-the-loop platform.INDEX TERMS WE-Type Inverter, 11-level operation, boosted output voltage, modified nearest level control, differential evolution, selective harmonic elimination.

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Voltage Source Multilevel Inverters With Reduced Device Count: Topological Review and Novel Comparative Factors

Cited by 194 publications

References 160 publications

A Survey on Reduced Switch Count Multilevel Inverters

A Survey on Reduced Switch Count Multilevel Inverters

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

11-Level Operation With Voltage-Balance Control of WE-Type Inverter Using Conventional and DE-SHE Techniques

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