KEYWORDS: Wavelets, Signal detection, Wavelet transforms, Capacitance, Signal analyzers, Fourier transforms, Interference (communication), Signal to noise ratio, Inductance, Detection theory
Small current grounding system is the system that the neutral point doesn't ground or grounds across the arc suppressing coils, which has been applied commonly in distribution system of many countries. As the grounding fault occurs, current is the one caused by capacity of circuit to ground only and it is rather small. The status of fault is complexity, e.g., the electromagnet interferes together with the amplified impact of zero-order loops to high-order singularity waves and various temporary variables. All these result in the lower ratio of the fault element signal to noise caused by zero-order current.
In this paper, the position of signal singularity and the magnitude of the singularity degree are analyzed based on the variable focus character of wavelet, and the time fault occurs is then determined. The series db wavelet with close sustain is adopted, and the line selection is according to the zero-order voltage of the generatrix and the current of various outlet line. It is proved by the experiment that the fault circuit diagnosis method based on wavelet analysis to the character of temporary status of single-phase grounding fault plays an important role to a finer line selection.
KEYWORDS: Control systems design, Control systems, Americium, Adaptive optics, Adaptive control, Water, Nonlinear control, Performance modeling, Bladder, Complex systems
In order to realize adaptive control of nonlinear big-lagged water location control system of drum boiler in thermal power plant, based on dynamic property analysis of the water supply course, a combination hybrid adaptive controller is designed in this paper. It includes a few hybrid adaptive controllers that parallel to work, the control signal is obtained by weighting the output signals of the few controllers, at same time, the method choosing weighed coefficients of the combination hybrid adaptive controllers is presented. Theoretical analysis and experiment result show the project is effective to solve inner disturbance, big-lag and pretense water location of the water location control system, and has quick adaptability and strong robustness. The results show that efficiency prospects for its further applications in power plant.
In this paper, the parameter quantification principle of 3D fluorescent light spectra and its realization technique are studied. The portable all fiber-optical fluorescent light measurer of mineral oil is given too. It can measure the qualified data of the content of the mineral oil in water quickly and really, and dispense of any chemical reagent.
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