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Design of Transformer magnetic bias Protection Device in High Power Electronic Equipments

Journal of Electrical Engineering 2014年第2期2卷 75-81页

作者： Xi Lei Guizhi Xu Zhanfeng Deng Power Electronics Department State Grid Smart Grid Research Institute Beijing 102200 China

As the power electronics technology is widely used in the power system, it may also bring the DC component to the transformer operation, resulting in DC bias and may cause great harm to the transformer. In this article, the device to protect transformer from DC magnetic bias is designed. On the basis of load DC current, a magnetic bias protection device is developed by combination of current sensor, electric information collection circuit, signal filtering circuit, signal modulating circuits, fault feature judging circuit, automatic range tracking circuit, intelligent logic synthesis unit and implementation output circuit. By operating in temperature-rise test equipment in the high power electronic lab, the device is proved with reliability, high sensitivity and worthy of promotion and application.

关键词： Power electronic device transformer magnetic bias protection design.

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Geomagnetic Orbit Determination Using Fuzzy Regulating Unscented Kalman Filter

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第4期38卷 695-703页

作者： CHEN Guifang YU Feng ZONG Hua WANG Run College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China Key Laboratory of Space Photoelectric Detection and Perception(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 210016P.R.China National Key Laboratory of Science and Technology on Aerospace Intelligent Control Beijing 100854P.R.China

Geomagnetic orbit determination fits for nanosatellites which pursue low cost and high-density ratio,but one of its disadvantages is the poor position accuracy introduced by magnetic ***,a new method,named the fuzzy regulating unscented Kalman filter(FRUKF),is *** magnetic bias is regarded as a random walk model,and a fuzzy regulator is designed to estimate the magnetic bias more *** input of the regulator is the derivative of magnetic bias estimated from unscented Kalman filter(UKF).According to the fuzzy rule,the process noise covariance is adaptively *** FRUKF is evaluated using the real-flight data of the *** experimental results show that the root-mean-square(RMS)position error is 3.1 km and the convergence time is shorter than the traditional way.

关键词： geomagnetic orbit determination unscented Kalman filter(UKF) fuzzy regulator magnetic bias international geomagnetic reference field(IGRF)

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Metamaterial Tunable Filter Design

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Journal of Electromagnetic Analysis and Applications 2013年第6期5卷 250-254页

作者： Naima Benmostefa M.Meliani H.Ouslimani STIC Laboratory Department of Electrical EngineeringFaculty of TechnologyUniversity Abou Bekr Belkaid-TlemcenTlemcenAlgeria University Paris Ouest Nanterre la Defense ParisFrance

This paper presents a new concept to implement a tunable filter metamaterial with dual negative refraction composed of ferrite slabs and metallic resonators, including split-ring resonators (SRR), and short wire pairs. The ferrite slabs under an applied magnetics bias provide one magnetic resonance frequency band and the metallic resonators provide another one. The continuous wires within the metamaterials provide the negative permittivity in a wide frequency band covering the two magnetic resonance bands. This type of metamaterialis analyzed in detail, and tunable stop band filters are successfully designed. The effective electromagnetic parameters obtained from the simulation of the S-parameters indicate that metamaterial exhibit negative refraction bands, which can be shifted by changing the magnetic bias.

关键词： Metamaterial SRR CSRR Tunable Filter magnetic bias

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