Special Issue "Multi-Level Converters"
A special issue of Electronics (ISSN 2079-9292).
Deadline for manuscript submissions: closed (30 April 2015)
Prof. Dr. Bimal K. Bose (Website)
Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996-2100, USA
Interests: power electronics; renewable energy systems; electric motor drives; fuzzy logic and neural network applications; electric and hybrid vehicles
Multi-level voltage source converters are characterized by having more than two voltage levels at the output compared to traditional converters which have two voltage levels. This class of converters is used in high voltage, high power (multi-MWs) applications, replacing the classical thyristor-based cycloconverters, load-commutated inverters (LCI) and current-fed converters. Such applications include induction and synchronous motor drives for various industrial applications, high voltage dc (HVDC) systems, flexible ac transmission systems (FACTS), static VAR compensators (SVC), active filters (AF), photovoltaic and wind generation systems, etc. The standard topologies of these converters are diode-clamped neutral-point clamped converter (NPC), flying capacitor (FC) converter and modular multi-level converters (MMC). The MMCs are again sub-classified into cascaded H-bridge (CHB) and cascaded half-bridge topologies. The general advantages of multi-level converters are the easy static and dynamic voltage sharing of the devices (IGBT or IGCT), improved PWM quality, reduced dv/dt and di/dt and improved reliability, compared to the two-level high voltage converters with a large number of devices in series. The MMC has the additional advantages of inherent low device voltage rating and a fault-tolerant capability. Considering their importance, multi-level converters are undergoing intense technological developments as revealed in recent literature relating to advanced topology development, modulation algorithms, control strategies, fault diagnostics and fault-tolerant controls. With the advent of large bandgap (SiC and GaN) power semiconductor devices with high voltage and high power, multi-level converters for industrial applications will be easily extended to a much higher range of power.
Prof. Dr. Bimal K. Bose
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- high power applications
- high voltage dc (HVDC) transmission
- flexible ac transmission system (FACTS)
- industrial ac drives
- photovoltaic system
- wind generation system
- fault-tolerant control of converter
- large bandgap devices