Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter

Pou, Josep; Pindado, R.; Boroyevich, Dushan; Rodriguez, P.

doi:10.1109/iecon.2003.1280581

Cited by 33 publications

(52 citation statements)

References 11 publications

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“…The proposed method has the same limitation as for the method of allocating redundancy small vectors. This limitation on neutral point voltage balancing is discussed in many papers, for example Fig.9 in [30] and Fig.8 in [34]. The proposed method in this paper provides another way to realize the neutral point voltage balancing.…”

Section: Validation Of the Proposed Tcb-dpwm Based Neutral Point Vmentioning

confidence: 96%

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

Wei

Xie

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper proposes a triangle carrier based discontinuous PWM (TCB-DPWM) implement method for threelevel neutral-point-clamped (3L-NPC) inverters. The function equivalent relationship of proposed TCB-DPWM and space vector based discontinuous PWM (SVB-DPWM) is mathematically analyzed in this paper. The proposed TCB-DPWM method effectively simplified the implementation of the SVB-DPWM by injecting twice common mode voltages (CMVs) to original modulation signals, where different DPWM methods can be easily obtained in a unified scheme by setting different values of proportional allocation factor for small vectors in different sectors. In addition, a TCB-DPWM based neutral point voltage balancing method is investigated to demonstrate its application. The polarity of the CMV injection is regulated according to the polarity of the proportional allocation factor to realize the neutral point voltage balancing. Finally, the proposed TCB-DPWM and neutral point voltage balancing method are both verified by simulation and experimental results. The results show that the proposed TCB-DPWM can effectively simplify the implementation of modulation and improve system efficiency. Index Terms-Three-level neutral-point-clamped inverter, voltage source inverter, discontinuous PWM, neutral point voltage balancing.

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Section: Validation Of the Proposed Tcb-dpwm Based Neutral Point Vmentioning

confidence: 96%

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

Wei

Xie

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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“…1, is the most widely studied and used in all types of industrial applications in the range of 2.3-4.16 kV, with some applications up to 6 kV [11]. A vast amount of literature [2,4,6,7,[12][13][14][15][16][17][18][19][20][21][22][23] is mainly dedicated to the modulation strategies and the balancing control of the neutral-point voltage. Seo et al [12] proposed a simplified three-level space vector pulse width modulation (SVPWM) method.…”

Section: Introductionmentioning

confidence: 99%

“…The DC imbalance can cause distortion of the output currents, but it can be easily solved by the balancing algorithm. Compared to the DC imbalance problem, the AC imbalance problem is discussed in many papers [2,6,13,15,16,[18][19][20]23]. The frequency of the neutral-point voltage oscillation is 3 times the fundamental frequency, and its amplitude strongly depends on the output current, the power factor, and the value of the capacitor [2,17,24].…”

Section: Introductionmentioning

confidence: 99%

A simplified hybrid carrier‐based PWM technique for three‐level NPC inverters considering neutral‐point voltage balance

Chen

Huang

et al. 2018

IEEJ Transactions Elec Engng

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An in‐depth analysis and comparison between the virtual space vector pulse width modulation (VSVPWM) method and the space vector pulse width modulation (SVPWM) method is presented in this paper. Compared to SVPWM, VSVPWM can achieve the balance of the neutral‐point voltage for any load over the full range of the inverter output voltage and for all load power factors. Nevertheless, VSVPWM would cause higher dv/dt of output voltages, higher voltage total harmonic distortion, and slower voltage‐balancing dynamic. A detailed analysis on these drawbacks is given. Then, the relationship between the neutral‐point current and the factor k0, which is employed to adjust the ratio of time of application of small vectors in a pair, is studied comprehensively, and a modified zero‐sequence voltage injection method for the two‐level inverter is introduced into the small hexagons of the three‐level space vector diagram. A simplified hybrid carrier‐based pulse width modulation (PWM) method is developed. Compared to VSVPWM, the proposed PWM method is not only easy to implement voltage‐balancing control but also reduces the switching frequencies of the devices and achieves better output voltage spectra and faster voltage‐balancing dynamic. All these benefits of the proposed method are verified through experimentation. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…The high frequency pulse width modulation PWM used to control the switches of NPC converter suppresses the voltage harmonics around and beyond the switching frequency components that allows the use of small filter at converter output to attenuate these high frequency harmonics. There are three methods commonly used to maintain dc link capacitors voltage balance of NPC converter [1], [3] [5]. The first method is based on carrier based PWM which injects small dc offset to the reference signals to redistribute the currents through the capacitors in order to maintain the voltage balance of the dc link capacitors [5].…”

Section: Introductionmentioning

confidence: 99%

“…This method is not accepted in power system industries, because the added dc offset may saturate the power transformers in the system. The second method is based on space vector modulation that uses redundant switching states that produce the same line-to-line voltage to maintain the dc link voltage balance [1]. This method is preferred in many applications such as medium voltage high power drive systems.…”

Section: Introductionmentioning

confidence: 99%

Comparison between Two VSC-HVDC transmission technologies: Modular and neutral point clamped multilevel converter

Adam¹,

Anaya‐Lara²,

Burt³

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Abstract─ The paper presents a detail comparison between two voltage source converter high voltage dc transmission systems, the first is based on neutral point-clamped (also known as HVDC-Light) and the second is based on innovative modular multilevel converter (known as HVDC-Plus). The comparison focuses on the reliability issues of both technologies such as fault ride-through capability and control flexibility. To address these issues, neutral point-clamped and three-level modular converters are considered in both stations of the dc transmission system, and several operating conditions are considered, including, symmetrical and asymmetrical faults. Computer simulation in Matlab-Simulink environment has been used to confirm the validity of the results. Key words-Modular multilevel converter (MMC), neutral point-clamped converter (NPC), pulse width modulation, and voltage source converter high voltage DC transmission system (VSC-HVDC)

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Evaluation of the low-frequency neutral-point voltage oscillations in the three-level inverter

Cited by 33 publications

References 11 publications

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

Triangle Carrier-Based DPWM for Three-Level NPC Inverters

A simplified hybrid carrier‐based PWM technique for three‐level NPC inverters considering neutral‐point voltage balance

Comparison between Two VSC-HVDC transmission technologies: Modular and neutral point clamped multilevel converter

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