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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Proceedings Article
Neutral Point Voltage Balancing Control and Quality power Improvement of PV System Based on Dual Three-level Stage Conversion
TL;DR: The capability of the proposed system to control the current injected into the grid, compensate the harmonics and the reactive power demand, and also guarantee the DC-link capacitors voltages balancing is demonstrated through variety of simulations.
Proceedings ArticleDOI
Capacitor Voltage Balancing of Four-Level ANPC and π-type Converters Based on Simplified Virtual-VectorPWM
TL;DR: In this paper , a simplified virtual vector PWM method was proposed to balance the dc-link capacitors voltage of four-level three-phase ANPC converters with different modulation index values under balanced and unbalanced loads.
Proceedings ArticleDOI
Three-Phase Neutral-Point-Clamped Step-up Nine-Level Inverter for Grid-Connected Applications
TL;DR: In this article , a nine-level inverter is developed by connecting a switched-capacitor (SC) unit at the rear stage of the conventional three-level neutral-point-clamped (NPC) inverter.
Proceedings ArticleDOI
A Comprehensive Control Scheme for CM Resonance Suppression and Current Quality Improvement with DPWM Method in ILCL-filtered Grid-connected Inverter
TL;DR: In this paper , a comprehensive control scheme is proposed to ensure the robust stability of the commonmode (CM) loop and improve current quality with high inverter's efficiency using discontinuous pulse width modulation (DPWM).
Proceedings ArticleDOI
Control and Modulation Method of a Three-phase Eight-switch Inverter for Two-stage Grid-connected Photovoltaic Systems
TL;DR: A novel transformerless two-stage photovoltaic (PV) grid-connected inverter is introduced and a nine-vector space vector pulse width modulation (SVPWM) algorithm based on optimal five-stage is adopted for eight-switch DC/AC inverter circuit, which could simplify the algebraic operation, reduce the switching loss and improve the utilization of the DC bus voltage.
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.