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This paper proposes a multilevel open-end six-phase motor drive. The system is composed of six isolated three-leg inverters and is adequate for high-power systems with voltage rating restrictions. The system model and a simple space vector pulse-width modulation (PWM) based on three similar individual planes are presented. Specific voltage vector application sequences that reduce the stator voltages...
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 proposes a single-phase ac-dc-ac converter composed of two three-leg converters connected in series with an H-bridge on its grid side. The proposed converter allows to feed the load voltage with sinusoidal voltages with constant amplitude and frequency and to operate with sinusoidal grid current with high power factor. Besides, the converter can be used to mitigate fundamental overvoltage...
This paper proposes a single-phase ac-dc-ac converter composed of a transformer and two three-leg converters connected in series. The proposed converter allows to feed the load voltage with sinusoidal voltages with constant amplitude and frequency and to operate with sinusoidal grid current with high power factor. Besides, the converter can be used to mitigate fundamental over-voltage and voltage...
This paper presents a universal active power filter (UAPF) based on single-phase ac/dc/ac converters with five legs. The proposed topology has multilevel voltage, reduced total harmonic distortion (THD) in current, and low weighted total harmonic distortion (WTHD) in voltage, when compared to conventional four-leg structure. The proposed UAPF is feasible to compensate reactive power, swells in grid...
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 proposes two different configurations of two-phase induction motor drives. These topologies utilize a single-phase supply to feed a two-phase machine/load and are more suitable when the amplitude of the load voltage is half the amplitude of the grid voltage. One of the topologies is transformerless and the other is transformer-based. The drive systems provide power factor control and DC-link...
An unidirectional single-phase three-wire rectifier is proposed in this paper. Such a proposed topology is composed of a non-controlled leg, two controlled legs and a capacitor bank. A suitable model and control strategy of the system, including a synchronization method, are proposed as well. The synchronization method, associated with the PWM strategy, imposes the grid currents to have the same phase...
This paper presents four nine-phase drive systems. A nine-phase machine is connected to four converters in an open-end winding arrangement, with one of the converters being shared by all machine groups. Because of the shared converter, the structures are only applied for machines with α = 0°. A PWM strategy is discussed in order to reduce machine torque ripple. Simulation and experimental results...
This paper presents an AC drive system based on six-phase machine with three neutrals. The machine side converter has nine power legs and can be connected to the grid through one single DC-link or three isolated DC-links. Compared with the conventional back-to-back AC six-phase machine drive system, the proposed drive system permits reducing the DC-link voltages, eliminating step-up transformer, and...
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