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
Fault-Tolerant Control Strategies for T-Type Three-Level Inverters Considering Neutral-Point Voltage Oscillations
TL;DR: This paper proposes two novel fault-tolerant control strategies named as improved two-level switching tolerant control and hybrid switching tolerance control (HS-TC), which are implemented by adding an optimal time-offset to the three-phase turn-on times.
Journal ArticleDOI
A Three-Phase Single-Stage AC–DC Wireless-Power-Transfer Converter With Power Factor Correction and Bus Voltage Control
TL;DR: A three-phase single-stage WPT resonant converter with PF correction (PFC) and bus voltage control is proposed to improve efficiency and power quality of three- phase input and reduce production cost and complexity for a high power WPT system.
Journal ArticleDOI
Z-source T-type inverter for renewable energy systems with proportional resonant controller
TL;DR: In this paper, a novel z-source T-type inverter for grid connected renewable energy system is proposed, which has ability of boosting voltage level without any additional DC-DC converter or transformer through the z-impedance network.
Journal ArticleDOI
A Coordinated Strategy Providing Zero-Sequence Circulating Current Suppression and Neutral-Point Potential Balancing in Two Parallel Three-Level Converters
TL;DR: In this paper, a coordinated control strategy is proposed for three-level T-type converters with the sharing dc bus and ac bus directly, where the distribution factor of one converter is in charge of the common neutral-point (NP) potential balancing with the auxiliary NP bus, while the distribution factors of the other converter is responsible for ZSCCs regardless of NP potential.
Journal ArticleDOI
Model predictive control for parallel three-level T-type grid-connected inverters in renewable power generations
TL;DR: A finite control set model predictive current control is proposed to suppress the ZSCC, balance the neutral-point (NP) voltage as well as control the currents with fast transient response to improve the quality and efficiency of applications.
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.