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In this work an ac-dc-ac multilevel power converter is investigated. The developed configuration is composed of one single-phase ac-dc-ac three-leg module and two H-bridges, one of them connected in the shared part of the system to employ multilevel voltages to input and output converter, and the other one connected on the grid side for input overvoltage. The converter is employed in applications...
This paper investigates a multilevel inverter composed of series/parallel-connected H-bridges. The presented structure can be used for applications in which is intended to use semiconductor switches with low voltage and low current rating. A comprehensive system model to control the circulating current, an overall control strategy to adjust the output voltage with constant magnitude and frequency,...
In this paper, a new hybrid multilevel six-phase machine drive system topology is proposed and investigated. Such topology is composed of two three-level three-phase neutral-point-clamped (NPC) inverters and a traditional two-level three-phase voltage source inverter (VSI) with isolated DC-links feeding the open-end windings (OEW) of a six-phase induction motor (SPIM). The system model, operating...
This paper investigates an ac-dc-ac multilevel power converter. The studied configuration is composed of two single-phase ac-dc-ac three-leg modules and series-connected H-bridges in the shared part of system. The converter is employed in applications with same input and output frequency, such as uninterrupted power supply (UPS) and unified power quality conditioner (UPQC) without isolation transformer...
This paper investigates the utilization of two different six-leg configurations of single-phase to three-phase converters. One of the topologies is transformerless and the other is transformer-based. The drive systems provide both bidirectional power flow and power factor control. Pulsewidth modulation techniques for the converter control are discussed. Simulation and experimental results are provided...
This paper investigates three AC-DC-AC multilevel topologies for three-phase four-wire (3P4W) applications obtained from an interconnection of three-leg voltage source converters (VSCs). The topologies provide bidirectional power flow and can be applied in line voltage regulators, universal active power filters and uninterrupted power supplies (UPS). Operating principles, a pulse-width modulation...
Static power converters are used for many applications, such as either uninterrupted power supply (UPS) or unified power quality conditioner (UPQC) without isolation transformer. Multilevel converter technologies have been widely recognized as a viable solution to overcome current and voltage limits of low power switching converters in high-power medium-voltage applications. This paper proposes and...
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