A 24-pulse rectifier cascaded multilevel inverter with minimum number of transformer windings

Joseph, A.; Wang, J.; Pan, Zhongqi; Chen, L.; Peng, Fang‐Zheng

doi:10.1109/ias.2005.1518300

Cited by 30 publications

(11 citation statements)

References 7 publications

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“…It has been used in a wide range of high power applications such as railway drive systems [8]- [11] or smartgrid applications [15], [29]. Instead of cascading H-bridges, cells featuring two NPC legs could be employed, creating a cascaded NPC-bridge converter (CNB) [30]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Huber

Kolar

2013

2013 IEEE Energy Conversion Congress and Exposition

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When power electronic systems are connected to the medium-voltage grid, often multilevel topologies consisting of a number of cascaded converter cells are considered. For a given grid voltage level, either few cells featuring semiconductors with high blocking voltage capability or many cells using lowvoltage semiconductors can be employed. This paper proposes efficiency/power density (η-ρ) Pareto analysis to comprehensively identify the optimum number of cascaded cells. Recent advances in silicon carbide (SiC) semiconductor technology point towards devices with blocking voltages exceeding 15 kV. The switching characteristics that hypothetical SiC devices would have to provide in order to realize a simple single-stage full-bridge converter competitive to a multilevel solution are derived and found to be impracticably fast. Furthermore, it is shown that reliability concerns arising with increasing number of cascaded cells can be mitigated by means of redundancy.

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Section: Introductionmentioning

confidence: 99%

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Huber

Kolar

2013

2013 IEEE Energy Conversion Congress and Exposition

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“…The so-called phase-shifted carrier PWM is the standard method for modulating the cascaded H-bridge inverter. For NPC bridge modulation, there are various PWM methods concerning about the neutral point balance [5,7,16]. Since the NPC bridge neutral point is already actively clamped by the rectifier in this paper, the phase-shifted carrier PWM is extensive for cascaded NPC type inverter as in Fig.5.…”

Section: Fig: 5 Inverter Control Diagrammentioning

confidence: 99%

Power Converter Topology for Permanent Magnet Wind Generator System

Balaji¹,

Gnanambal²,

Suganya³

2013

IOSRJEN

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A modular converter for permanent magnet wind generator system is presented. Multilevel converters have many advantages such as the capacity to generate a very good quality of waveforms, the reduced switching frequency, the low energy loss and the low effort on power devices. The converter modules are cascaded to get medium voltage output 6 KV, thus eliminating the grid-side step up transformer, which is enviable for both onshore and offshore wind turbines. Each and every converter module is composed of a rectifier, dc-link and an inverter. Here the generator coils are 90 degree phase shifted which are then rectified through the power factor correction (PFC) circuit and linked in series to get unity power factor, stable dc-link power and higher dc-link voltage. The generator armature inductance is used as the AC-side PFC boost inductor, thus dipping the system size and cost. The inverter adopts a neutral point clamped (NPC) converter to match the dc-link voltage level and are cascaded to get multilevel medium voltage output. The vector control scheme is used to correct the converter active and reactive power transferred to the grid. Simulation results with a 1.5MW wind generator and converter system confirm the proposed topology and control method.

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“…In AC/DC conversion, phase-shifting Transformers are widely used for transforming voltages of 3-phase into voltages of more phase for rectifiers to produce DC with multiple but slight ripples. The output/input configuration of a phase-shifting transformer is commonly of 3-phase/ n×3-phase when applied in rectifier systems, and n×3-phase /3-phase when applied in inverter systems [5][6][7][8]. It is either composed by several conventional 3-phase transformers of different turns ratios, or by multiple 3-phase windings as well as 3-phase iron cores on which they are wounded.…”

Section: Introductionmentioning

confidence: 99%

A novel strategy for composing staircase waveform in multi-module inverters

Wang

Xiang

et al. 2011

2011 International Conference on Electrical and Control Engineering

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In multi-module inverter systems, phase-shifting transformers are needed to compose non-sinusoidal voltages into staircase waveforms approaching sinusoid. Aiming at the drawbacks of normal phase-shifting transformers with respect of installation and operation, the paper proposes a novel transformer of round shape resembling induction motor. Contrast to the normal phase-shifting transformers, the iron core of the novel one is more compact and symmetrical, and the windings distribution and connection are simpler. Focusing on novel transformer of dual Y/ Y, the paper theoretically proves that harmonics of the 5 th , 7 th etc. are eliminated from the composed magneto motive force (MMF). Mathematic model of the novel transformer is set up and simulated numerically for exhibiting the main performance.

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A 24-pulse rectifier cascaded multilevel inverter with minimum number of transformer windings

Cited by 30 publications

References 7 publications

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Optimum number of cascaded cells for high-power medium-voltage multilevel converters

Power Converter Topology for Permanent Magnet Wind Generator System

A novel strategy for composing staircase waveform in multi-module inverters

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