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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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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, 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
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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), 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
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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
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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
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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
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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
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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
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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
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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
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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
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IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029), 2003
To compensate for the zero sequence current arising from asymmetrical operation of a transmission line, a neutral point clamped (NPC) inverter with a fourth wire must be employed. The most significant challenge arising from controlling of the four-wire NPC inverter consists in stabilizing the neutral point potential at the DC link middle value.
null Xioming Yuan +2 more
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To compensate for the zero sequence current arising from asymmetrical operation of a transmission line, a neutral point clamped (NPC) inverter with a fourth wire must be employed. The most significant challenge arising from controlling of the four-wire NPC inverter consists in stabilizing the neutral point potential at the DC link middle value.
null Xioming Yuan +2 more
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2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015
This paper studies the modeling, switching strategy and control scheme for NPC three-level (NPC-3L) inverter fed dual-three-phase permanent magnet synchronous motor (PMSM) drives. Firstly, the dynamic modeling of the system is described and analyzed.
Zheng Wang, Jian Chen, Ming Cheng
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This paper studies the modeling, switching strategy and control scheme for NPC three-level (NPC-3L) inverter fed dual-three-phase permanent magnet synchronous motor (PMSM) drives. Firstly, the dynamic modeling of the system is described and analyzed.
Zheng Wang, Jian Chen, Ming Cheng
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IEEE Transactions on Power Electronics, 2016
A simplified pulse width modulation (PWM) strategy for a neutral-point-clamped three-level converter with unbalanced dc links is proposed in this paper to achieve high-quality line-to-line output voltages and to maximize the linear modulation range. The simplified strategy takes the direct output voltage modulation by calculating the special solutions ...
Zongbin Ye +5 more
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A simplified pulse width modulation (PWM) strategy for a neutral-point-clamped three-level converter with unbalanced dc links is proposed in this paper to achieve high-quality line-to-line output voltages and to maximize the linear modulation range. The simplified strategy takes the direct output voltage modulation by calculating the special solutions ...
Zongbin Ye +5 more
openaire +1 more source