Showing papers by "Armando Cordeiro published in 2011"
01 Oct 2011
TL;DR: In this paper, the authors proposed modifications of the classical two-level three-phase voltage-source inverter topology structure with the aim of increasing its reliability to safety-critical applications.
Abstract: This paper proposes modifications of the classical two-level three-phase voltage-source inverter topology structure with the aim of increasing its reliability to safety-critical applications. This solution intends to achieve fast changing and “soft” commutation between main and redundant branches through the combination of mechanical commutators and power devices. Also, important modifications in the power supply stage will allow to withstand severe short-circuit conditions. With those modifications, the energy processing capability can be maintained for most common failure modes. Several aspects of failure modes, detection and isolation processes within voltage-source inverters are also discussed regarding the requirements of safety related applications. Experimental results from a prototype are included to confirm the validity of the proposed solution.
17 citations
27 Apr 2011
TL;DR: A modified topology of the neutral-point-clamped inverter suitable to increase the converter reliability in safety-critical applications and its fault-tolerant ability results from redundancy of power devices and from modifications in the control strategy.
Abstract: This paper presents a modified topology of the neutral-point-clamped inverter suitable to increase the converter reliability in safety-critical applications. With the proposed scheme, the energy processing capacity can be maintained even for multiple failure modes. Its fault-tolerant ability results from redundancy of power devices and from modifications in the control strategy. The theoretical validity of the proposed solution is confirmed by simulation results.
15 citations
27 Apr 2011
TL;DR: Experimental results confirm the validity of the proposed solutions for fast changing and "soft" commutation between main and redundant branches in fault-tolerant inverter topologies through the combination of mechanical commutators and semiconductors.
Abstract: This paper presents some solutions for fast changing and “soft” commutation between main and redundant branches in fault-tolerant inverter topologies through the combination of mechanical commutators and semiconductors. The present study deals with redundant two-level three-phase voltage-source inverters. Experimental results confirm the validity of the proposed solutions.
10 citations
01 Sep 2011
TL;DR: In this paper, a multilevel converter with two DC voltage sources and three H Bridges is presented and studies a four wires output of the inverter allowing five levels to the modulated voltages that feed an asymmetrical two windings phase induction motor.
Abstract: This paper presents and studies a multilevel converter with two DC voltage sources and three H Bridges The inverter modulates two independent single-phase voltages using a four wires output The design of the inverter allows five levels to the modulated voltages that feed an asymmetrical two windings phase induction motor The classical SPWM technique was used to modulate the multilevel power inverter switches; the frequency of the carrier (a triangular wave) was varied and total harmonic distortion (THD) of voltages and currents were compared The simulation results were obtained using the Matlab/Simulink®/SimPowerSystems software
1 citations