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ReRAM devices show potential for in memory computing systems due to their capability to both store and process data via implication logic. This type of logic, which is typically implemented using the set transition, could offer reliability and performance advantage if implemented with reset switching of the device. However, the gradual transition of the reset makes it impractical. This paper presents...
This paper focused on a fast mechanical switch applied in 2kV hybrid DC contactor. An integrated design of vacuum switch based on Permanent Magnetic Actuator (PMA) is proposed. The stainless steel bellows is removed to avoid vacuum failure caused by air leakage and eliminate restriction of bellows' fatigue life compared to conventional vacuum switch. Both monostable structure and compact springs'...
Today’s control systems such as smart environments have the ability to adapt to their environment in order to achieve a set of objectives (e.g., comfort, security and energy savings). This is done by changing their behaviour upon the occurrence of specific events. Building such a system requires to design and implement autonomic loops that collect events and measurements, make decisions and execute...
The Avionics Full-Duplex Switched Ethernet (AFDX) network has established itself as a reference in aeronautical embedded communications to comply with the growth of bandwidth needs and the reliability requirements. Its determinism property imposes that AFDX frames have to transit through the network in a limited amount of time. Due to potential delays in the processing frames at a reception End-System,...
Field oriented control (FOC) is considered as one of the most efficient techniques for speed tracking problem of permanent magnet linear synchronous motor (PMLSM) drives. However, the main inherent drawbacks of classic FOC methods are the high sensitivity to machine parameters, high switching frequency and unsuitable performances in tracking low speeds. In this paper, a new strategy based on nonlinear...
Employing sliding mode controller in matrix converters presents advantages such as easy on-line implementation, quick and reliable choice of the correct switching combinations and ensuring that the system tracks their references. The main drawback of the sliding mode controller is chattering phenomenon which affects the performance of the controller by injecting high frequency variation in controller...
Increasing redundant paths in transmission grids has always been thought to be a tool to enhance service reliability. However, network equations by intertwining power flows through redundant paths impose more limits on systems with more redundancy. Accordingly, autonomous removing of a few lines may relief capacity limit violations in some contingency events thereby enhancing service reliability....
Reliable network time measurement tools are important to ensure that monitoring network systems work properly, but their development do not consider security as a concern and, for example, delay attacks could compromise those tools effectiveness. Indeed, nowadays the network time measurement is not always reliable. Some researches do propose to increase network time measurement reliability using Openflow...
In this paper, the physical mechanism and models of oxide-based resistive-switching random access memory (RRAM) and the optimization of the devices and arrays are addressed and reviewed. The review focuses on our research achievements on the unified physical mechanism, physical-based models including switching and reliability behaviors, and the optimization design issues of the oxide-based RRAM.
In this paper, an algorithm is proposed to investigate the improvement in HV network reliability when the number and location of Remotely Operable Switches (ROS) is changed. Specifically, the Particle Swarm Optimisation PSO is employed to identify; (i) optimal placement of remotely operable protective devices and (ii) the optimal sequence of reconfiguration and restoration of the supply based on a...
Hextuple-inverter configuration for multilevel nine-phase symmetrical open-winding DC converter is articulated in this work. Power modular unit consists of six classical three-phase voltage source inverters (VSI). Each VSI includes one bi-directional device (MOSFET/IGBT) per each phase and link to two capacitors for neutral connection. A modified single carrier five-level modulation (MSCFM) algorithm...
This paper presents a model predictive control (MPC) scheme for quasi-Z-source (qZS) three-phase four-leg inverter. In order to cope with the drawbacks of traditional voltage source inverters (VSIs), a qZS three-phase four-leg inverter topology is proposed. This topology features a wide range of voltage gain which is suitable for applications in renewable energy-based power systems, where the output...
Renewable Energy sources integration to the grid is becoming more vital due to the market share increase. The integration of PV farms, for instance, usually requires a DC-DC conversion stage to boost up the source voltage. In addition, DC-DC converters with continuous input current reduce the bulky input capacitor requirements. This saves the cost, and enhances the reliability of the system since...
In the smart-grid era, distribution power systems are undergoing a great deal of renovation. Utilities, more than ever before, are adopting technologies that aim primarily at enhancing the reliability of the power delivery systems in a safe and sustainable manner. In this paper, we analyze the reliability enhancements that distribution automation technologies bring to power distribution systems. We...
Power electronic converters are considered as an expensive part of energy harvesting systems while their reliability is low. Most of these converters consist of more than one stage such as DC/AC or DC/DC/AC converters that each one has its own power semiconductor switches. Increasing the number of switches is costly and leads to lower the reliability. Among different types of converters there is an...
A new transmission failure model for Avionics Full-Duplex Switched Ethernet (AFDX) is established in this paper. It aims at quantifying the transmission failure with the real-time considerations. Using the statistical mean field theory, the failure function with the traffic dynamics considerations is determined. Simulation results can verify the effectiveness of our model. This study can contribute...
The SMaRTS model, Scheduling Maintenance for Reliable Transmission Systems, is developed to schedule transmission line maintenance requests optimally and centrally at the central dispatcher (CD) level. The SMaRTS model promises up to 4% production cost savings by solely shifting the maintenance to an optimal time frame for the system. The model is developed to co-optimize generation unit commitment...
Increasing redundant paths in transmission grids has always been thought to be a tool to enhance service reliability. However, network equations by intertwining power flows through redundant paths impose more limits on systems with more redundancy. Accordingly, autonomous removing of a few lines may relief capacity limit violations in some contingency events thereby enhancing service reliability....
Simulation and experimental studies of two output series resonant inverter with Asymmetrical Duty Cycle (ADC) control are presented in this work. The prototype has been implemented using 06 MOSFET transistors with 06 antiparallel diodes as switches. The inverter is designed to supply two resonant loads. Simulation and experimental results of the output waveforms of the proposed inverter for RLC load...
In this paper a new topology for boost converter as well as an efficient control system based on state space modeling is presented in order to improve the power factor of the network. The main objective of this study is to adjust the real power of DG resources connected to network. The proposed power factor correction (PFC) boost converter includes two loops for current and voltage control and on...
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