Results 91 to 100 of about 303 (143)

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
openaire   +1 more source

Model of three level neutral point clamped converter (NPC) for grid connected photovoltaic systems

2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2015
Photovoltaic modules as direct converters of solar energy into electrical energy are typically connected to the power grid trough standard two level converters. A photovoltaic system can be connected to the power grid if it can satisfy the IEEE standardized conditions set by the power grid operator.
Mateja Novak, Viktor Sunde, Zeljko Jakopovic   +2 more
openaire   +3 more sources

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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Optimal power control strategies for neutral point clamped (NPC) inverter topology

IEEE Transactions on Industry Applications, 1992
A programmed pulsewidth modulation (PWM) technique for selectively eliminating several lower-order harmonics at the output of a neutral point clamped (NPC) inverter topology is investigated. The switching function approach is utilized to derive relevant analytical expressions for input/output variables.
P. Enjeti, R. Jakkli
openaire   +1 more source

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.
Hamidreza Ghoddami, Amirnaser Yazdani
openaire   +1 more source

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
openaire   +1 more source

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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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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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
openaire   +1 more source

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
openaire   +1 more source