Results 181 to 190 of about 5,279 (233)
Some of the next articles are maybe not open access.
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 +3 more
openaire +1 more source
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 +3 more
openaire +1 more source
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
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
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), 1999This 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
openaire +1 more source
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
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
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, 2012One 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
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), 2012In 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
openaire +1 more source
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 +3 more
openaire +1 more source
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 +3 more
openaire +1 more source
2013 Fourth International Conference on Intelligent Control and Information Processing (ICICIP), 2013
Diode neutral-point-clamped(NPC) three-level inverter has more significant characteristics than traditional two-level inverter, such as high utilization rate on voltage of the DC side, low harmonics output, small switching stress etc. There has no mature products of three-level inverter with control system until now.
Ping Li, Qingxiao Zhang
openaire +1 more source
Diode neutral-point-clamped(NPC) three-level inverter has more significant characteristics than traditional two-level inverter, such as high utilization rate on voltage of the DC side, low harmonics output, small switching stress etc. There has no mature products of three-level inverter with control system until now.
Ping Li, Qingxiao Zhang
openaire +1 more source
2013 IEEE Energy Conversion Congress and Exposition, 2013
The neutral-point balancing of 3L-NPC converter has been studied in many works in the past. However, all state-of-the-art methods have in common that the information of the energy-flow direction is needed. Recently, Direct Dead-time Control (DDTC) has been presented which controls the converter dead-times to balance the dc-link independent from the ...
Michael Sprenger +4 more
openaire +1 more source
The neutral-point balancing of 3L-NPC converter has been studied in many works in the past. However, all state-of-the-art methods have in common that the information of the energy-flow direction is needed. Recently, Direct Dead-time Control (DDTC) has been presented which controls the converter dead-times to balance the dc-link independent from the ...
Michael Sprenger +4 more
openaire +1 more source
Energy, 2014
This paper is on offshore wind energy conversion systems installed on the deep water and equipped with back-to-back neutral point clamped full-power converter, permanent magnet synchronous generator with an AC link. The model for the drive train is a five-mass model which incorporates the dynamic of the structure and the tower in order to emulate the ...
Seixas, Mafalda +2 more
openaire +2 more sources
This paper is on offshore wind energy conversion systems installed on the deep water and equipped with back-to-back neutral point clamped full-power converter, permanent magnet synchronous generator with an AC link. The model for the drive train is a five-mass model which incorporates the dynamic of the structure and the tower in order to emulate the ...
Seixas, Mafalda +2 more
openaire +2 more sources