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This paper investigates the application of multisensor fault feature extraction and fuzzy-logic based clustering for the condition monitoring of bearing. Multiple independent sensors on an electric motor drive system provide valuable early indication of a fault, and can be effectively utilized to perform high reliable and optimal fault detection. Through utilizing common sensors including current...
This paper presents fault detection and its analysis for permanent magnet assisted synchronous reluctance motor (PMa-SynRM). The PMa-SynRM has been increasingly studied for critical service application where high efficiency and reliability is required in industry. However, the research on the fault in a PMa-SynRM has been limitedly studied, and no study on the eccentricity fault diagnosis for multiphase...
During the last few years, there has been an increased attention paid on the developments of DC microgrids (DCMGs) and their applications. For economical and more flexible wind power generation, doubly fed induction generator (DFIG) is regarded as a most commonly used generator in wind farms. This paper presents a configuration and operation method for a DCMG connected with DFIGs, in which the controller...
Excessive levels of the harmonics are undesirable as they can cause additional heat losses in rotating machinery and therefore reduce the machinery useful lifetime. An approach to reduce the harmonics is proposed. The technique requires estimates of harmonic state in the given network by firstly classifying nodes of the network into one of four types. The condition for minimum measurement set is derived...
Using circuit analysis, it is shown that it is generally not possible to attribute precisely the power contributions from harmonic sources in loads. A harmonic power flow control scheme is proposed instead so as to reduce the harmonic heating effect in motor loads and thus increase the lifetime of the motors. The technique is based on the sensitivity measure of harmonic real power in the motors to...
We demonstrate that platinum nanorods across the gap of a nanoresonator shift or overdamp the resonance depending on the rod-size. Moreover, what is striking is that the thinner nanorods almost completely turn off both the fundamental and higher mode resonances, analogous to the pinch harmonics.
A new approach to harmonic state estimation is proposed by firstly classifying the network nodes into four types. Classification of a particular node into one of the four types is based on the availability or otherwise of node voltage and nodal harmonic injection current measurement at the node. Algebraic expressions to determine all the remaining unknown node harmonic voltages and nodal harmonic...
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