Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter

Ye, Zongbin; Xu, Yiming; Li, Fēi; Deng, Xin; Zhang, Yuanzheng

doi:10.6113/jpe.2014.14.3.519

Cited by 21 publications

(20 citation statements)

References 14 publications

(16 reference statements)

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“…Although these different kinds of three-level SVPWM strategies are vector representation of the CBM method with specific zero-sequence voltages injection, it is difficult to calculate the zero-sequence voltages to realize different targets [14]. In [15] a simplified PWM strategy that uses the relation between the CBM and SVPWM has been proposed. The simplified PWM can realize optimized control directly by adjusting the three phase pulse widths instead of the injected zero-sequence voltages.…”

Section: Introductionmentioning

confidence: 99%

A Simplified PWM Strategy for a Neutral-Point-Clamped (NPC) Three-Level Converter With Unbalanced DC Links

et al. 2016

IEEE Trans. Power Electron.

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A simplified PWM strategy for NPC 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 of the voltage-second balance equations without detecting the position of the reference vector in the asymmetrical and complicated space voltage vector diagrams to reduce the calculation time. A novel solution based on the state transition is proposed to extend the maximum linear modulation index to 1.15. Furthermore, the asymmetric control of the split dc-link by the proposed PWM is implemented by adjusting the special solutions. Difference between the conventional SVPWM and the proposed strategy is conducted to illustrate the advantages of the simplified strategy. The effectiveness of the proposed modulation strategy is verified by simulation and experiment results.Index Terms-linear modulation range, NPC inverter, PWM, unbalanced dc-link.

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Section: Introductionmentioning

confidence: 99%

A Simplified PWM Strategy for a Neutral-Point-Clamped (NPC) Three-Level Converter With Unbalanced DC Links

et al. 2016

IEEE Trans. Power Electron.

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“…A space vector diagram of a three-level converter with all of the switching state combinations [17] is shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Zhang¹,

Tang²,

Han³

et al. 2016

Journal of Power Electronics

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A novel Virtual Space Vector (VSV) modulation strategy for complete control of potential neutral point (NP) issues is proposed in this paper. The neutral point potential balancing problems of multi-level converters, which include elimination of low frequency oscillations and self-balancing for NP dc unbalance, are investigated first. Then a set of improved virtual space vectors with dynamic adjustment factors are introduced and a multi-objective optimization algorithm which aims to optimize these adjustment factors is presented in this paper. The improved virtual space vectors and the multi-objective optimization algorithm constitute the novel Virtual Space Vector modulation. The proposed novel Virtual Space Vector modulation can simultaneously recover NP dc unbalance and eliminate low frequency oscillations of the neutral point. Experiment results show that the proposed strategy has excellent performance, and that both of the neutral point potential issues can be solved.

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“…Three-level neutral point clamped (3LNPC) inverters belong in a category of multilevel converters that are increasingly being used in industry [5], [6]. Wind energy conversion [7], photovoltaic conversion [8] and multiphase AC drives [9] are some of the applications of 3LNPC inverters.…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Method for the Diagnosis of Multiple Switch Faults in NPC Inverters Based on Output Currents Analysis

Abadi¹,

Mendes²,

Cruz³

2016

Journal of Power Electronics

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This paper presents a new approach for fault diagnosis in three-level neutral point clamped inverters. The proposed method is based on the average values of the positive and negative parts of normalized output currents. This method is capable of detecting and locating multiple open-circuit faults in the controlled power switches of converters in half of a fundamental period of those currents. The implementation of this diagnostic approach only requires two output currents of the inverter. Therefore, no additional sensors are needed other than the ones already used by the control system of a drive based on this type of converter. Moreover, through the normalization of currents, the diagnosis is independent of the load level of the converter. The performance and effectiveness of the proposed diagnostic technique are validated by experimental results obtained under steady-state and transient conditions.

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Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter

Cited by 21 publications

References 14 publications

A Simplified PWM Strategy for a Neutral-Point-Clamped (NPC) Three-Level Converter With Unbalanced DC Links

A Simplified PWM Strategy for a Neutral-Point-Clamped (NPC) Three-Level Converter With Unbalanced DC Links

A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

A Real-Time Method for the Diagnosis of Multiple Switch Faults in NPC Inverters Based on Output Currents Analysis

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