Results 131 to 140 of about 631 (184)

A soft commutated neutral-point-clamped (NPC) inverter: theory and experimentation

APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition, 2002
A soft commutation circuit aimed to substitute for the conventional snubber in a GTO NPC inverter is presented in this paper. The small rating lossless auxiliary branch creates soft switching conditions for the main devices without having to subject them to extra voltage/current spikes or any modulation constraints.
null Xiaoming Yuan, I. Barbi
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Evaluation of soft switching techniques for the neutral-point-clamped (NPC) inverter

30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321), 2003
This paper evaluates the topological variants of the soft switching NPC inverter based on the resonant pole techniques. Conventional dissipative and regenerative snubbers as well as soft switching techniques for NPC inverter discussed in the past decade are reviewed first.
X. Yuan, H. Stemmler, I. Barbi
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A neutral point clamped multilevel topology flow graph and space NPC multilevel topology

2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015
Neutral-Point Clamped (NPC), such as diode-clamped, multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. However, the NPC Multilevel topology also has variable type of structure which cannot be found due to lack of systematic derivation methodology.
Hongliang Wang, Yan-Fei Liu, Paresh C. Sen   +2 more
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Phase current reconstruction of three-level Neutral-Point-Clamped(NPC) inverter with a neutral shunt resistor

2017 IEEE Applied Power Electronics Conference and Exposition (APEC), 2017
This paper presents the reconstruction method of three phase current for AC motor by inserting a shunt resistor at the neutral point of a 3-level Neutral Point Clamped(NPC) inverter. To precisely acquire the phase currents from the shunt resistor, the switching time of the effective voltage vectors needs to secure the minimum time. For this reason, the
Jae-Jun You, Jun-Hyung Jung, Chang-Hwan Park, Jang-Mok Kim   +3 more
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A neutral-point potential balancing method for Z-source neutral-point-clamped (NPC) inverters by adding the shoot-through offset

2014 International Power Electronics and Application Conference and Exposition, 2014
Compared with the conventional buck-boost three-level inverters, the Z-source neutral-point-clamped (NPC) inverters have more simple structure with improved output waveform quality. But the neutral-point potential unbalance problem is still a drawback for their applications. Based on the research of SPWM modulation method and the analysis of the effect
Xiuyan Shi, Alian Chen, Chenghui Zhang
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A transformer assisted zero voltage switching scheme for the neutral-point-clamped (NPC) inverter

APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285), 1999
This paper proposes a transformer assisted PWM zero voltage switching neutral-point-clamped (NPC) inverter. With the assistance of a transformer assisted small rating lossless auxiliary circuit, the main switches work with zero voltage switching without suffering from any voltage/current spikes, under simple explicit control.
null Xiaoming Yuan, I. Barbi
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An FPGA-based Dead-time Computation Technique for Neutral Point Clamped Multilevel Inverter (NPC-MLI)

2020 IEEE 17th India Council International Conference (INDICON), 2020
In order to prevent the occurrence of the short circuit between the identical phase-leg semiconductor switches, dead-time is injected in the pulse width modulation (PWM) voltage source multilevel inverters (MLIs). This paper proposes a mathematically formulated dead-time computation technique for neutral-point clamped multilevel inverters (NPC-MLIs ...
Rishiraj Sarker, Asim Datta
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The balancing properties of DC link compensation for 3-phase Neutral Point Clamped (NPC) Converter

Proceedings of The 7th International Power Electronics and Motion Control Conference, 2012
One of the major benefits of a three level NPC multilevel converter is that it requires only one DC source. However, the intermediate Neutral Point (NP) voltage of the converter must be maintained midway between the two outer dc-bus voltages, to avoid semiconductor device overvoltage stress and output modulation distortion. Various approaches have been
Z. Mohzani, B. P. McGrath, D. G. Holmes
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An analysis of the three-level neutral-point clamped (NPC) inverter with two independent DC sources

2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2012
In addition to its other merits, the three-level neutral-point clamped (NPC) inverter allows two dc sources, which may be an advantage in photovoltaic systems for enhanced maximum power-point tracking capability and higher energy yield. This paper takes a look at the impact of power mismatch between the two dc sources on the performance of the inverter.
H. Ghoddami, A. Yazdani
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Passive balancing of the DC bus midpoint for Neutral Point Clamped (NPC) based Voltage Source Converters

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
This paper presents a passive method to balance the voltage of the split capacitors in Neutral Point Clamped (NPC) based Voltage Source Converters (VSC). The voltage of the two capacitors is equated by connecting a low VA transformer at the AC side of the converter. The transformer is connected in wye configuration and its neutral point is connected to
Aitor Laka, Jon Andoni Barrena, Javier Chivite-Zabalza, Miguel Angel Rodriguez   +3 more
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