A Novel Switching Sequence Design for Five-Level NPC/H-Bridge Inverters With Improved Output Voltage Spectrum and Minimized Device Switching Frequency

Cheng, Zhongyuan; Wu, Bin

doi:10.1109/tpel.2007.909244

Cited by 111 publications

(48 citation statements)

References 16 publications

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“…There has also been more emphasis on modeling and control of a five level NPC/H-bridge inverter without cascading the bridge (Cheng & Wu, 2007). This fails to address the principle of realizing a general cascaded n-level NPC/H-Bridge.…”

Section: Wwwintechopencommentioning

confidence: 99%

Cascaded NPC/H-Bridge Inverter with Simplified Control Strategy and Superior Harmonic Suppression

Wanjekeche¹,

Nicolae²,

Jimoh³

2011

MATLAB - A Ubiquitous Tool for the Practical Engineer

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Section: Wwwintechopencommentioning

confidence: 99%

Cascaded NPC/H-Bridge Inverter with Simplified Control Strategy and Superior Harmonic Suppression

Wanjekeche¹,

Nicolae²,

Jimoh³

2011

MATLAB - A Ubiquitous Tool for the Practical Engineer

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“…To address this matter, various methods have been introduced to reduce the computations of the SVM applied in multilevel converters [18]- [21]. In addition, a novel switching sequence is designed in [22] to improve the output voltage spectrum and to minimize the switching frequency for five-level NPC/H-Bridge converters.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Model Predictive Voltage Control for NPC/H-Bridge Converters with a Reduced Computational Burden

Gong

Dai

et al. 2017

Journal of Power Electronics

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In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.

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“…However, these topologies require a lot of active and passive clamping devices. Five-level H-bridge NPC (5L-HNPC) converter is composed of the H-bridge connection of two classic three-level NPC phase legs, which significantly increases the output voltage and power capacity of the converter [14], [15]. However, this topology requires three isolated dc sources and the bulky phase shifting transformer.…”

Section: Introductionmentioning

confidence: 99%

Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

Li¹,

Jiang²

2017

Journal of Power Electronics

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Multilevel active neutral-point-clamped (ANPC) converter combines the advantages of three-level ANPC converter and multilevel flying capacitor (FC) converter. However, multilevel ANPC converter often suffers from capacitor voltage balancing problems. In order to solve the capacitor voltage balancing problems for five-level ANPC converter, phase-shifted pulse width modulation (PS-PWM) is used, which generally provides natural voltage balancing ability. However, the natural voltage balancing ability depends on the load conditions and converter parameters. In order to eliminate voltage deviations under steady-state and dynamic conditions, the active voltage-balancing control (AVBC) methods of floating capacitors and dc-link capacitors based on PS-PWM are proposed. First, the neutral-point current is regulated to balance the neutral-point voltage by injecting zero-sequence voltage. After that, the duty cycles of the redundant switch combinations are adjusted to balance the floating-capacitor voltages by introducing moderating variables for each of the phases. Finally, the effectiveness of the proposed AVBC methods is verified by experimental results.

show abstract

A Novel Switching Sequence Design for Five-Level NPC/H-Bridge Inverters With Improved Output Voltage Spectrum and Minimized Device Switching Frequency

Cited by 111 publications

References 16 publications

Cascaded NPC/H-Bridge Inverter with Simplified Control Strategy and Superior Harmonic Suppression

Cascaded NPC/H-Bridge Inverter with Simplified Control Strategy and Superior Harmonic Suppression

A Hierarchical Model Predictive Voltage Control for NPC/H-Bridge Converters with a Reduced Computational Burden

Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

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