Multi-Level Converters

Bose, B.K.

doi:10.3390/electronics4030582

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…With the increasing demand for high-power AC/DC and DC/AC converters in modern energy systems, the use of controlled multilevel converters is becoming more common [1]. Multilevel converters offer several advantages over traditional two-level converters, including improved efficiency, reduced dv/dt, and lower total harmonic distortion of the output voltage [2].…”

Section: Introductionmentioning

confidence: 99%

Generalization of Split DC Link Voltages Behavior in Three-Phase-Level Converters Operating with Arbitrary Power Factor with Restricted Zero-Sequence Component

Siton,

Kuperman

2023

Electronics

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This article examines the impact of a power factor on the behavior of partial DC link voltages in three-phase three-level AC/DC (or DC/AC) converters operating without additional balancing hardware. We consider the case in which the controller utilizes a bandwidth-restricted (DC in steady state) zero-sequence component to achieve average partial DC link voltage equalization since the injection of high-order zero-sequence components is impossible or forbidden. An assessment of partial split DC-link capacitor voltage behavior (particularly that of ripple magnitudes and phases) is necessary for, e.g., minimizing the values of DC link capacitances and selecting reference voltage values. Previous studies assessed the abovementioned behavior analytically for operation under a unity power factor based on third-harmonic-dominated split partial voltages’ ripple nature. However, it is shown here that deviation from the unity power factor introduces additional (to the third harmonic) non-negligible harmonic content, increasing partial voltage ripple magnitudes and shifting their phase (relative to the mains voltages). As a result, the third-harmonic-only assumption is no longer valid, and it is then nearly impossible to derive corresponding analytical expressions. Consequently, a numerical approach is used in this work to derive a generalized expression of normalized ripple energy as a function of the power factor, which can then easily be utilized for assessments of split DC link voltage behaviors for certain DC link capacitances and reference voltages. Simulations and experimental results validate the proposed methodology applied to a 10 kVA T-type converter prototype.

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Section: Introductionmentioning

confidence: 99%

Generalization of Split DC Link Voltages Behavior in Three-Phase-Level Converters Operating with Arbitrary Power Factor with Restricted Zero-Sequence Component

Siton,

Kuperman

2023

Electronics

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“…They are installed wherever DC voltage exists (like in a battery and solar panels), while loads need AC voltage. Although a full-bridge inverter with four switches is the most common technology on the market, newly emerged multilevel inverters are replacing older products due to the reduced cost of the semiconductor devices [1,2].…”

Section: Introductionmentioning

confidence: 99%

Standalone Operation of Modified Seven-Level Packed U-Cell (MPUC) Single-Phase Inverter

2019

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In this paper the standalone operation of the modified seven-level Packed U-Cell (MPUC) inverter is presented and analyzed. The MPUC inverter has two DC sources and six switches, which generate seven voltage levels at the output. Compared to cascaded H-bridge and neutral point clamp multilevel inverters, the MPUC inverter generates a higher number of voltage levels using fewer components. The experimental results of the MPUC prototype validate the appropriate operation of the multilevel inverter dealing with various load types including motor, linear, and nonlinear ones. The design considerations, including output AC voltage RMS value, switching frequency, and switch voltage rating, as well as the harmonic analysis of the output voltage waveform, are taken into account to prove the advantages of the introduced multilevel inverter.

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Electrical-thermal-mechanical Modeling and Analysis of Press-pack IGBT for Flexible HVDC Converter Valve

Liu

Zheng

2022

2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)

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Multi-Level Converters

Abstract: In the history of modern power electronics evolution, we are now going through the era of multi-level converters [1]. [...]

Cited by 9 publications

References 12 publications

Generalization of Split DC Link Voltages Behavior in Three-Phase-Level Converters Operating with Arbitrary Power Factor with Restricted Zero-Sequence Component

Generalization of Split DC Link Voltages Behavior in Three-Phase-Level Converters Operating with Arbitrary Power Factor with Restricted Zero-Sequence Component

Standalone Operation of Modified Seven-Level Packed U-Cell (MPUC) Single-Phase Inverter

Electrical-thermal-mechanical Modeling and Analysis of Press-pack IGBT for Flexible HVDC Converter Valve

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