P. M. Barbosa

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This paper proposes a multilevel power conversion concept based on the combination of neutral-point-clamped (NPC) and floating capacitor converters. In the proposed scheme, the voltage balancing across the floating capacitors is achieved by using a proper selection of redundant switching states, and the neutral-point voltage is controlled by the classical(More)
This paper proposes a novel approach to adapt the conventional direct power control (DPC) for high power applications with a third order LCL filter. The strong resonance present in the LCL filter is damped with additional effort in the system control. The application of DPC to the control of three-phase voltage source inverter (VSI) connected to the grid(More)
Several methods to reduce the effect of wide input voltage variation in soft-switched DC/DC converters for high-power and high-voltage traction applications are presented in this paper. To enhance high conversion efficiency together with high reliability and cost reduction, the document addresses the use of a power architecture whose front-end is a(More)
This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant converter. By applying phase-shift control between the primary and secondary sides of the transformer, the converter can operate at a fixed switching frequency. The converter can achieve ZVS operation in the entire load range by using the magnetizing inductance of the(More)
This paper presents a very high efficiency AC/DC/DC converter topology suitable for all those applications dealing with high power requirements and good handling of very wide input voltage variations, such as Traction auxiliary services. In particular, to enhance high conversion efficiency together with high reliability and cost reduction, the document(More)
This paper proposes a novel approach to adapt a conventional direct power control (DPC) for high-power applications, where a third-order LCL filter is frequently required. The LCL filter can cause a strong resonance and requires additional effort for system control. The application of a DPC for the control of a three-phase voltage source inverter that is(More)
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