. (2013) 'Open-and short-circuit switch fault diagnosis for nonisolated dcdc converters using eld programmable gate array.', IEEE transactions on industrial electronics., 60 (9). pp. 4136-4146. Further information on publisher's website: Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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This paper proposes fault tolerant operation of single switch DC-DC converter under switch failure. In order to improve the reliability in critical applications, fault tolerant operation is mandatory to guarantee service continuity. Fault tolerant operation of a power system can be performed in three steps: fault diagnosis (detection and identification) and remedial actions.In the case of a switch failure, suitable fault detection is essential to avoid its propagation to the whole system. This study is based on a fast and efficient open and short circuit switch fault diagnosis. Both types of switch failure can be detected, identified and handled in real time by implementing fault diagnosis and reconfiguration strategies on a F P GA target. No additional sensor is required to perform the fault detection. A redundant switch and a bidirectional switch are needed for converter reconfiguration in post-fault operation. The results of Hardware-In-the-Loop (HIL) and experimental tests, which all confirm the good performances of the proposed approach, are presented and discussed.

This article presents a new circuit topology for high voltage gain active switched boost quasi Z-source inverter (qZSI) and a pulsewidth modulation (PWM) technique. The higher boosting capability with a lower number of elements, the continuous source current, the less voltage stress across the devices, and having the common ground are the main advantages of the proposed structure. The voltage gain of the proposed inverter is twice that of the conventional capacitor-assisted qZSI (sCA-qZSI). Other benefits of the proposed inverter over the sCA-qZSI are the reduction of Z-source passive components and shoot-through current. Compared to the conventional active switched inductor boost qZSI, the proposed inverter has higher output voltage and also lower shoot-through current, while it has fewer components (one fewer inductor, two fewer diodes, but one more capacitor). The boost factor of the proposed inverter is more than twice that of the classic ones. Besides, a high gain PWM technique is proposed, which can be applied to any types of Z-source inverters. Both the simulation and experimental results of the proposed inverter under the proposed PWM technique are examined to validate their operation.

Power electronics based Hybrid DC Power Systems (HDCPS) are increasingly used in many industrial applications such as land, sea and air vehicles. In these systems, small DC-link and LC filter capacitors are of great interest for weight saving. Usually in HDCPSs there are Constant Power Loads and negative dynamic impedance of these loads may generate unstable oscillations. Besides, the risk of resonance may be increased under unbalanced load conditions.In this paper, a distributed active oscillation suppression approach is presented. It is based on the analytical study of the linearized model of the studied system around the operating point. The studied system consists of one main DC source and one storage element supplying two loads: a Permanent Magnet Synchronous Motor connected to the DC-link by a voltage source inverter and a resistive load supplied by a DC/DC converter through the same DC bus. The proposed approach is particularly used to overcome the resonance under unbalanced load conditions and allows reducing DC-link and LC filter capacitors for weight saving. Simulations and experimentations are carried out which confirm the validity of the proposed approach.

International audienceSingle-ended non-isolated DC-DC converters are used in embedded and safety critical applications. In more applications like airplanes, trains, electric vehicles, ships and distributed power systems fast fault detection is a mandatory step in order to make a suitable response to a switch fault. On the other hand, a fault tolerant topology is necessary to prevent further damage and to guaranty continuity of service. This paper proposes a very fast and efficient open circuit switch fault detection method associated to fault tolerant converter topology. Fault detection method is based on the shape of the inductor current. To perform very fast switch fault detection a Field Programmable Gate Array (FPGA) digital target is used for the implementation of the proposed method and control. No additional sensors, which increase system cost and reduce reliability, are required for this detection method. Results show that the proposed method is fast, robust, and can be done in a few microseconds

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Nowadays Distributed Power Systems (DPSs) are used in different applications such as aerospace industry, submarines, ships and hybrid electric vehicles. However, interaction between the converters in these technologies, also create new challenges like instability due to the "Constant Power Loads" (CPL). In this paper, the small-signal analysis results of a DC hybrid power system are presented. This system is constituted of two load-converters with tight regulation, that exhibit CPL behavior and a battery with a DC-DC converter that are connected to a DC network. A distributed linear stabilization approach is considered to increase the reliability of the system; hence, an oscillation compensation technique is proposed to improve the stability margin of the system. Simulation and experimentation confirm the validity of the proposed approach.