Transformerless Split-Inductor Neutral Point Clamped Three-Level PV Grid-Connected Inverter

Xiao, Huafeng; Xie, Shaojun

doi:10.1109/tpel.2011.2164940

Cited by 189 publications

(50 citation statements)

References 23 publications

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“…Compared to the three-level NPC topology [4], the Ttype employs an active bidirectional switch to the dc-link voltage midpoint and gets along with two diodes less per bridge leg. It is an alternative to more complex three-level topologies such as active neutral point clamped converters [9]- [11] or split-inductor converters [12], [13]. The 3LT 2 C basically combines the positive aspects of the two-level converter such as low conduction losses, small part count and a simple operation principle with the advantages of the three-level converter such as low switching losses and superior output voltage quality.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Highly Efficient Three-Level T-Type Converter for Low-Voltage Applications

Schweizer

Kolar

2013

IEEE Trans. Power Electron.

863

295

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The demand for lightweight converters with high control performance and low acoustic noise led to an increase in switching frequencies of hard switched two-level low-voltage 3-phase converters over the last years. For high switching frequencies, converter efficiency suffers and can be kept high only by employing cost intensive switch technology such as SiC diodes or CoolMOS switches; therefore, conventional IGBT technology still prevails. In this paper, the alternative of using three-level converters for lowvoltage applications is addressed. The performance and the competitiveness of the three-level T-type converter (3LT 2 C) is analyzed in detail and underlined with a hardware prototype. The 3LT 2 C basically combines the positive aspects of the two-level converter such as low conduction losses, small part count and a simple operation principle with the advantages of the three-level converter such as low switching losses and superior output voltage quality. It is, therefore, considered to be a real alternative to two-level converters for certain low-voltage applications.

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Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Highly Efficient Three-Level T-Type Converter for Low-Voltage Applications

Schweizer

Kolar

2013

IEEE Trans. Power Electron.

863

295

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“…1. Compared to the PV inverters with galvanic isolation, the transformerless PV inverters have the advantages of lower cost, higher efficiency, smaller size, and lower weight [2], [3]. Using an LCL-type output filter, instead of the traditional Lor LC-type filters, aims toward the reduction of the size of the reactive elements comprising the output filter of the PV inverter [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Transformerless Grid-Connected PV Inverters Including Reliability

Koutroulis

Blaabjerg

2013

IEEE Trans. Power Electron.

194

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This paper presents a new methodology for optimal design of transformerless photovoltaic (PV) inverters targeting a cost-effective deployment of grid-connected PV systems. The optimal switching frequency as well as the optimal values and types of the PV inverter components is calculated such that the PV inverter LCOE generated during the PV system lifetime period is minimized. The LCOE is also calculated considering the failure rates of the components, which affect the reliability performance and lifetime maintenance cost of the PV inverter. A design example is presented, demonstrating that compared to the nonoptimized PV inverter structures, the PV inverters designed using the proposed optimization methodology exhibit lower total manufacturing and lifetime maintenance cost and inject more energy into the electricgrid and by that minimizing LCOE.Index Terms-DC-AC power conversion, failure analysis, optimization methods, photovoltaic (PV) power systems, reliability.

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“…Many interesting single-phase transformerless PV inverter topologies have been reported to deal with the common mode voltage problems [3][4][5][6][7][8][9]. However, the high penetration with many single-phase PV inverters into grid will cause the undesired power oscillations and unbalanced problems.…”

Section: Introductionmentioning

confidence: 99%

Three-phase seven-switch inverter with common mode voltage reduction for transformerless photovoltaic system

Guo

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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Common mode voltage reduction is one of the most important issues for transformerless PV grid-connected inverters. Many interesting single-phase inverter topologies have been reported to reduce the common mode voltage. However, threephase PV inverter topologies with reduced common mode voltage are not well explored. In this paper, a novel three-phase sevenswitch (H7) inverter is proposed to reduce the common mode voltage. It is derived from the conventional three-phase inverter, but has different operation principles. Therefore, a new modulation is presented to achieve the effective common mode voltage reduction. In addition, a simple control strategy is proposed to achieve the fast and accurate grid current regulation. Theoretical analysis and performance evaluation tests are carried out to verify the effectiveness of the proposed H7 topology and control strategy.

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Transformerless Split-Inductor Neutral Point Clamped Three-Level PV Grid-Connected Inverter

Cited by 189 publications

References 23 publications

Design and Implementation of a Highly Efficient Three-Level T-Type Converter for Low-Voltage Applications

Design and Implementation of a Highly Efficient Three-Level T-Type Converter for Low-Voltage Applications

Design Optimization of Transformerless Grid-Connected PV Inverters Including Reliability

Three-phase seven-switch inverter with common mode voltage reduction for transformerless photovoltaic system

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