DC fault clearance is one of the critical issues for modular-multilevel-converter-based high voltage direct current (MMC-HVDC) systems. Employing a hybrid circuit breaker (H-DCCB) to isolate faulty line typical method achieve fast clearance. However, H-DCCB has interrupt and absorb energy up tens megawatts in several milliseconds. Through theoretical analysis interruption process using H-DCCB, ...

The rotating machinery is a common class of machinery in the industry. The root cause of faults in the rotating machinery is often faulty rolling element bearings. This paper presents a novel technique using artificial neural network learning for automated diagnosis of localized faults in rolling element bearings. The inputs of this technique are a number of features (harmmean and median), whic...

The rotor misalignment fault, which occurs only second to imbalance, easily in the practical rotating machinery system. Rotor can be further divided into coupling and bearing misalignment. However, most of existing references analyze effect on dynamic characteristics system ignore change excitation caused by Based above limitations, a five degrees freedom nonlinear restoring force mathematical ...

An increasing number of applications are demanding real-time performance from their multiprocessor systems. For many of these applications, a failure may produce disastrous results. Such failures are avoided in hard real-time systems by the use of fault-tolerance. In hard real-time multiprocessor scheduling, this fault tolerance may be provided by including several task backups in each schedule...

Action-level (AL) fault tolerance means to accomplish every critical action (output action of a critical task as speciied) successfully in spite of component failures. Therefore, it is aimed for the highest degree of fault tolerance in real-time computer systems. Several basic techniques developed in recent years for realizing action-level fault tolerance in real-time LAN (local area network)-b...

The emergence of wireless networked sensors constitutes a hot research topic in embedded system design. Although system resource is seriously limited, operating system applied in sensors has to implement complex task scheduling, which should support concurrent operations, real-time constraint, adaptability and reliability. In this paper, we present a reliable OS scheduling scheme for wireless n...

Abstract Safety–critical applications rely heavily on multilevel inverters. This article introduces a fault tolerant (FT) inverter sustaining an uninterrupted operation with open switch occurred in single and multiple power switches. Power semiconductor devices used dc-ac converters increased numbers to obtain high-quality voltage waveform which makes them vulnerable failure. As result, reliabi...