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Suppression of ferroresonance using passive memristor emulator

Chinese Physics B 2021年第6期30卷 667-674页

作者： S Poornima Electrical Engineering Department Anna UniversityChennai-600025India

Power system inherently consists of capacitance and inductance in its components. Equipment with saturable inductance and circuit capacitance provides circumstances of generating ferroresonance, resulting in overvoltage and overcurrent in the connected system. The effects of ferroresonance result in insulation failure and hence damage to the equipment is unavoidable. Though many devices are proposed for mitigating such circumstances, a promising technology of using memristors may provide better performance than others in the future. A memristor emulator using the N-channel JFET J310 is used in this work. Unlike other electronic components that replicate memristor properties, the chosen memristor emulator is a passive device since it does not need any external power supply. Simulation and experimental results verify the design of a memristor emulator and the characteristics of an ideal memristor. Experimental results prove that the memristor emulator can suppress the fundamental ferroresonance induced in a prototype single phase transformer. The results of the harmonic analysis also validate the memristor performance against the conventional technique.

关键词： ferroresonance memristor emulator passive components single-phase transformer

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Prediction of Outdoor Noise Propagation Induced By single-phase Power transformers

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Sound & Vibration 2019年第1期53卷 2-13页

作者： Xueyun Ruan Wei Huang Linke Zhang Yan Gao School of Mechanical Engineering Anhui University of Science and TechnologyAnhui Huainan232000China Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing100190China School of Energy and Power Engineering Wuhan University of TechnologyHubei Wuhan430063China

Outdoor power transformers are one of the most pervasive noise sources in power transmission and distribution *** prediction of outdoor noise propagation plays a dominant role for the evaluation and control of noise relevant to the transformer *** this paper surface vibration tests are carried out on a scale model of a single-phase transformer tank wall at different excitation *** phase and amplitude of test data are found to be randomly distributed when the excitation frequency exceeds the seventh mode frequency,which allows the single-phase power transformer to be simplified as incoherent point *** outdoor-coherent model is subsequently developed and incorporated with the image source method to investigate noise propagation from single-phase power transformers,due to the occurrence of multiple reflections and diffractions in the propagation path of each point *** proposed model is used to calculate the sound field of the power transformer group by exploiting the additional phase *** comparison with the ISO9613 model and the boundary element method,it is found that the proposed coherent image source method leads to more accurate prediction results,and hence better performance for the prediction of the outdoor noise induced by single-phase power transformers.

关键词： single-phase transformer surface vibration scale model noise prediction coherent image source method

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