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Potential faults in safety critical systems may lead to system failures thus bring huge human injuries. How to ensure the correctness of the system during the system development is very important. System function testing has been regarded as an effective approach which normally applied in the final stage of system development to ensure the consistence of system functions and specifications. In this...
An innovative topology-based method for modeling railway train control systems is proposed in this paper. The method addresses the problems of having to rely too much on designers' experience and of incurring excessive cost of validation and verification in the development of railway train control systems. Four topics are discussed in the paper: 1) the definition of basic topological units for modeling...
This paper presents a back-to-back pulse width modulation (PWM) converter for the flywheel energy storage system (FESS), which store energy in the form of kinetic energy. The permanent magnet brushless DC machine (BLDCM) is used for energy conversion. Back-to-back PWM converter used in FESS improves power factor, reduces the harmonic content and controls the bi-directional flow of energy. The principle...
The brushless DC motor, which emerged as the development of technology of electronics, is a new kind of DC motor, and it is also the important part of modern industry [1]. Because of its reliability of operation, brushless DC motor has been widely used in many special areas, such as aerospace and mining.
In order to study the applications of ESS in power systems, this paper proposes a standard procedure to develop a full mathematical dynamic model of power systems installed with ESS, which include SMES, AC, BESS and FESS. Results of computer simulation are presented to demonstrate the effect of ESS on power system dynamics. Investigation of power system stability as affected by the installation of...
In order to enhance the performance of networked control system, a novel scheduling algorithm is proposed. MCF (maximum-change-first) which is the simplified MEF-TOD is used to design the basic priority, and then, LDLP (larger-delay-lower-priority) strategy is used to dynamically adjust the priority of the message. In the view of the importance of the message, the new scheduling algorithm called MCF-LDLP...
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