Journal ArticleDOI
Design and Implementation of a Highly Efficient Three-Level T-Type Converter for Low-Voltage Applications
Mario Schweizer,Johann W. Kolar +1 more
TLDR
The 3LT2C as mentioned in this paper combines the positive aspects of the two-level converter such as low conduction losses, small part count and a simple operation principle with the advantages of the three-level converters such as the low switching losses and superior output voltage quality.Abstract:
The demand for lightweight converters with high control performance and low acoustic noise led to an increase in switching frequencies of hard switched two-level low-voltage 3-phase converters over the last years. For high switching frequencies, converter efficiency suffers and can be kept high only by employing cost intensive switch technology such as SiC diodes or CoolMOS switches; therefore, conventional IGBT technology still prevails. In this paper, the alternative of using three-level converters for low-voltage applications is addressed. The performance and the competitiveness of the three-level T-type converter (3LT2C) is analyzed in detail and underlined with a hardware prototype. The 3LT2 C basically combines the positive aspects of the two-level converter such as low conduction losses, small part count and a simple operation principle with the advantages of the three-level converter such as low switching losses and superior output voltage quality. It is, therefore, considered to be a real alternative to two-level converters for certain low-voltage applications.read more
Citations
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Journal ArticleDOI
DC-Bus Voltage Range Extension in 1500 V Photovoltaic Inverters
TL;DR: In this article, the authors investigated the dc-bus voltage range extension capabilities of single-stage conversion photovoltaic (PV) inverters with a focus on DC modulation and power devices utilization.
Journal ArticleDOI
Symmetric/Asymmetric Hybrid Multilevel Inverters Integrating Switched-Capacitor Techniques
Junfeng Liu,Wu Jialei,Jun Zeng +2 more
TL;DR: A pair of symmetric/asymmetric hybrid MLIs is proposed in this paper with boost ability, which are especially appropriate for synthesizing a staircase output directly from an input source of low voltage.
Journal ArticleDOI
Fast Finite-Switching-State Model Predictive Control Method Without Weighting Factors for T-Type Three-Level Three-Phase Inverters
TL;DR: This work proposed a fast finite-switching-state MPC (FSS-MPC) algorithm without weighting factors that saves computation time up to 53.3%, simplifies the practical implementation and improves the portability of the algorithm.
Journal ArticleDOI
Hybrid Seven-Level Converter Based on T-Type Converter and H-Bridge Cascaded Under SPWM and SVM
TL;DR: In this paper, a hybrid seven-level converter based on T-type converter and H-bridge cascaded suitable for low-voltage and high-power-density applications is analyzed comprehensively.
Journal ArticleDOI
A Single-Phase Single-Source 7-Level Inverter With Triple Voltage Boosting Gain
TL;DR: A newMLI topology is proposed that requires only one dc source and is capable of generating seven voltage levels with triple voltage boosting gain and alleviates the voltage stress across switches such that low voltage stress of not more than the dc source voltage is ensured on all switches.
References
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A New Neutral-Point-Clamped PWM Inverter
TL;DR: In this article, a neutral-point-clamped PWM inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed.
Journal ArticleDOI
A New Neutral-Point-Clamped PWM Inverter
TL;DR: The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
Journal ArticleDOI
Recent Advances and Industrial Applications of Multilevel Converters
Samir Kouro,Mariusz Malinowski,K. Gopakumar,Josep Pou,Leopoldo G. Franquelo,Bin Wu,Jose Rodriguez,Marcelo A. Perez,Jose I. Leon +8 more
TL;DR: This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry.
Journal ArticleDOI
The active NPC converter and its loss-balancing control
T. Bruckner,S. Bernet,H. Guldner +2 more
TL;DR: A loss-balancing scheme is introduced, enabling a substantially increased output power and an improved performance at zero speed, compared to the conventional NPC VSC.
Journal ArticleDOI
Influence of the modulation method on the conduction and switching losses of a PWM converter system
TL;DR: In this paper, the authors explore the dependency of the conduction losses of a bridge leg of a PWM power converter system with a high pulse rate on the shape of the phase modulation functions.