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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lu Zhao Xianglu He Li Fan Qing Gong Yaowu Wu Litao Ouyang Yunhao Xiao Hubei Electric Power Investigation and Design Institute Wuhan China Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434263

The construction of the power market evaluation system is an important process in the construction of the power market. With the continuous development of China electricity spot market, how to combine the development characteristics of the domestic electricity spot market and systematically propose a set of index systems to evaluate the market development process and operation status is an urgent problem that needs to be resolved. Based on the SCP(structure-behavior-performance) theory commonly used in the evaluation of foreign electricity markets, this paper lists key indicators from three aspects: market structure, market behavior and market performance. At the same time, combined with the characteristics of the analytic hierarchy process and the fuzzy set theory, the fuzzy analytic hierarchy process is introduced to organically combine the objectivity of indicators and the subjectivity of expert judgment, which can quantitatively analyze the development of various aspects of the market. Finally, the actual data of the PJM market in the United States is used to analyze, and the results prove the effectiveness of the method.

关键词： Regulators Conferences Analytic hierarchy process System integration Electricity supply industry Power markets Fuzzy set theory

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Small-Signal Modeling of LLC Resonant Converters

Small-Signal Modeling of LLC Resonant Converters

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2020 IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2020

作者： Ma, Yixiao Wei, Yun Yang, Hua Cheng, Xin Zhang, Chen Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Shanghai Institute of Space Power-sources Shanghai China State Key Laboratory of Space Power-sources Technology Shanghai China

ISBN: (纸本)9781728152240

Owing to the advantages of high efficiency and high power density, LLC resonant converters have been widely used. Generally, in order to design the closed-loop regulator, the small-signal model is necessary. Nevertheless, the small-signal model of LLC resonant converter is usually complex and inconvenient to be used to design regulators. In this paper, a third-order small-signal model of LLC resonant converter is derived, which is simple enough to obtain analytical expressions and conducive to be utilized to design the closed-up regulator. Finally, the accuracy of the model is confirmed by the simulation results. © 2020 IEEE.

关键词： Power converters

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Design and Verification of Gate Driver for 6.5 kV SiC MOSFET Module

Design and Verification of Gate Driver for 6.5 kV SiC MOSFET...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Yijian Wang Lin Liang Hai Shang Lubin Han State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Ministry of Education Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

Gate driver for 6.5kV /25A Silicon Carbide (SiC) MOSFET module, which features low coupling capacitance, is proposed in this paper. In contrast to 6.5 kV Silicon (Si) IGBT module, 6.5 kV SiC MOSFET module captures the ability to switch at a much higher frequency, improving the power density greatly. However, the common mode current, which flows through the coupling capacitance between primary and secondary sides of the isolation transformer of gate driver produced by high dv/dt during quick switching, may produce annoying electromagnetic interference (EMI). Firstly, the coupling capacitance of single ring transformer and double ring transformer is simulated based on electrostatic Finite Element Method (FEM). Then, these two schemes are adapted to make isolation transformer of the gate driver for 6.5kV SiC MOSFET module. In the end, double pulse test circuit is built, and thus, double pulse test is carried out so as to assess the designed gate driver. Experimental results show that, compared with single ring transformer, common mode current, which flows by the coupling capacitance between primary and secondary sides of the double ring isolation transformer, has been reduced by 13.10/0. In addition, the 6.5kV SiC MOSFET module is switched on and switched off by the designed gate driver at 4500V supply voltage and 15A current with low oscillation at gate-source voltage. To be specific, voltage overshoot during turn off is no more than 200V, about 4.5% of the bus voltage, and, the amplitude of reverse recovery current is about 3A during turn on process, all of which verify the gate driver's effectiveness.

关键词： Couplings MOSFET Silicon carbide Voltage Switches Logic gates Transformers

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Univesal Design of LLC Resonant Converter with Fixed Switching Frequency

Univesal Design of LLC Resonant Converter with Fixed Switchi...

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2020 IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2020

作者： Xu, Jiangtao Wei, Yun Cheng, Xin Yang, Hua Xue, Hongxiang Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Shanghai Institute of Space Power-Sources Shanghai China State Key Laboratory of Space Power-Sources Technology Shanghai China

ISBN: (纸本)9781728152240

In this paper, a universal design for the LLC resonant converter with fixed switching frequency is proposed. In order to realize zero voltage switching (ZVS) and zero current switching (ZCS), the fixed switching frequency is selected slightly lower than the resonant frequency. Subsequently, the simplified model of LLC resonant converter is derived based on the fundamental harmonic approximation (FHA) method, and the relationship among voltage gain, the inductance ratio lambda and the quality factor pmbQ in frequency domain is analyzed. Based on this, a universal design of resonance tank parameters is given, and a simulation model is built in Saber. Finally, the simulation results well verify the effectiveness of the design method. © 2020 IEEE.

关键词： Natural frequencies

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Optimized Design for the 12-Pulse Uncontrolled Rectifier with a Coupling Interphase Reactor

Optimized Design for the 12-Pulse Uncontrolled Rectifier wit...

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2020 IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2020

作者： Su, Guoxing Li, Yang Liu, Shichao Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Shanghai Institute of Space Power-Sources Shanghai China State Key Laboratory of Space Power-Sources Technology Shanghai China

ISBN: (纸本)9781728152240

Owing to simplicity, lower total harmonic distortion, and higher power factor benefits, the 12-pulse uncontrolled rectifiers with a coupling interphase reactor are widely used as the power factor correction (PFC) converters, which are inserted between the power grid and the non-linear loads. However, the key parameters of the 12-pulse rectifier, such as transformer ratio, coupling coefficient and self-inductance of interphase reactor, and the capacitance of filter capacitor, are generally designed by trial and error, which is complicated and inefficient. In order to offer a useful reference for engineers to design the 12-pulse rectifier, a simply design program is proposed considering current ripple and output voltage ripple. Subsequently, optimized parameters of the 12-pulse rectifier are obtained after running the design program. Therefore, the rectifier can work in high performance with smaller size. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed design program are validated by simulation results. © 2020 IEEE.

关键词： Inductance

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Parameter Deviation Effect Study of the Power Generation Unit on a Doubly-Fed Induction Machine-based Shipboard Propulsion System

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CES Transactions on Electrical Machines and Systems 2020年第4期4卷 339-348页

作者： Kai Ni Yihua Hu Chun Gan State Key Laboratory of Advanced Electromagnetic Engineering and Technology the School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanHubei 430074China Department of Electronics Engineering HeslingtonUniversity of YorkYorkYO105DDU.K.

To lower the difficulty of fault protection,a doubly-fed induction machine based shipboard propulsion system(DFIM-SPS)that is partially power decoupled is *** such an intrinsically safe SPS architecture,a synchronous generator(SG)is employed for power generation,and the accuracy of the parameters of power generation unit(PGU)plays an important role in SPS stable *** this paper,the PGU parameter deviations are studied to evaluate the effects on system *** models of salient-pole SG,type DC1A excitation system(EXS)and DFIM are illustrated ***,the corresponding control scheme is *** the 16 important parameters of PGU,up to 40%of parameter deviations are applied to implement parameter sensitivity ***,simulation studies are carried out to evaluate the parameter deviation effects on system performance in *** defining three parameter deviation effect indicators(PDEIs),the effects on the PGU output variables,which are the terminal voltage and output active power,are ***,the increasing rates of PDEIs with different degrees of parameter deviations for the key parameters are ***,the overall system performance is investigated for the two most influential PGU *** paper provides some vital clues on SG and EXS parameter identification for DFIM-SPS.

关键词： shipboard propulsion system partially power decoupled doubly-fed induction machine synchronous generator parameter deviation

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Calculation and verification of magnetic force in a radial permanent magnetic bearing based on quasi-monte carlo method 1

Calculation and verification of magnetic force in a radial p...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Du, Yuanhao Ye, Caiyong Deng, Cong Yu, Dezuan Xiong, Fei Zhang, Jianping Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China Xiling Magnetic Energy Technology Zhengding Co. LTD Shijiazhuang050000 China

ISBN: (纸本)9781728196596

Permanent magnetic bearings (PMB) are used nowadays in many applications ranging from turbomachinery to energy storage flywheels due to their simple construction, no contact, and no wear. The calculation of the magnetic force is of great significance in the optimal design progress. However, the current magnetic force expression obtained by the equivalent magnetic charge model is a multidimensional integral with a complex integrand. In order to simplify the calculation under the premise of ensuring accuracy, the equal distribution sequence Quasi-Monte Carlo method (QMC) is used to calculate the magnetic force between two ring magnets in this paper. Based on Monte Carlo method (MC), it is proposed to solve the multidimensional integral by using a sequence of low-discrepancy irrational numbers that are more uniform than the randomly generated point distribution to avoid aliasing of projections and have a faster rate of convergence. The integral is programmed in MATLAB using MC and QMC and verified using the finite element method (FEM), then the results are compared with the data in published literature. The results show that QMC has higher accuracy and better repeatability than MC, and the calculation efficiency is higher. The results of the proposed method are in good agreement with FEM and published literature, and the required time is shorter than FEM, which is a more suitable method for magnetic force calculation in some cases. © 2020 IEEE.

关键词： Monte Carlo methods

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Electronic structures,magnetic properties,and martensitic transformation in all-d-metal Heusler-like alloys Cd2MnTM(TM=Fe,Ni,Cu)

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Chinese Physics B 2020年第8期29卷 407-412页

作者： Yong Li Peng Xu Xiaoming Zhang Guodong Liu Enke Liu Lingwei Li Institute of Advanced Magnetic Materials School of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310012China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The electronic structures,magnetic properties,and martensitic transformation in all-d-metal Heusler-like alloys Cd2MnTM(TM=Fe,Ni,Cu)were investigated by the first-principles calculations based on density-functional *** results indicate that all three alloys are stabilized in the ferromagnetic L21-type *** total magnetic moments mainly come from Mn and Fe atoms for Cd2MnFe,whereas,only from Mn atoms for Cd2MnNi and *** magnetic moment at equilibrium lattice constant of Cd2MnFe(6.36μB)is obviously larger than that of Cd2MnNi(3.95μB)and Cd2MnCu(3.82μB).The large negative energy differences(ΔE)between martensite and austenite in Cd2MnFe and Cd2MnNi under tetragonal distortion and different uniform strains indicate the possible occurrence of ferromagnetic martensitic transformation(FMMT).The minimum total energies in martensitic phase are located with the c/a ratios of 1.41 and 1.33 for Cd2MnFe and Cd2MnNi,*** total moments in martensitic state still maintain large values compared with those in cubic *** study is useful to find the new all-d-metal Heusler alloys with FMMT.

关键词： all-d-metal Heusler-like alloys electronic structures magnetic properties martensitic transformation

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Flexible Multi State Switch of Distribution Network Based on Flux Controlled Adjustable Reactor

Flexible Multi State Switch of Distribution Network Based on...

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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Tang, Xiaoliang Yang, Fang Zhou, Yabing Zhang, Guangyi Gong, Jie Qingyuan Power Supply Bureau China Southern Power Grid Corporation Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Flexible Multi-states Switch based on power electronics technology can realize the flexible interconnection between feeders, elastically control feeder power flow and solve the serious unbalance of feeder power flow in the distribution network. To solve the problem, this paper proposes that using flux-controlled variable reactor as the topology of flexible multi-states switch in distribution network. Firstly, flux-controlled variable reactor's principle will be introduced;Then, we analyze the principle of feeder power flow's control using variable reactor;After that, the control strategy for the flexible multi-states switch with different access methods is proposed;At last, a MATLAB simulation model and the prototype experiment platform are built. The results verified the power flow control function of flexible multi-states switch and effectiveness of proposed controlled strategy. © Published under licence by IOP Publishing Ltd.

关键词： MATLAB

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MHD Simulations on Magnetic Compression of Field Reversed Configurations

arXiv

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arXiv 2022年

作者： Ma, Yiming Zhu, Ping Rao, Bo Li, Haolong International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

The magnetic compression has long been proposed a promising method for the plasma heating in a field reversed configuration (FRC), however, it remains a challenge to fully understand the physical mechanisms underlying the compression process, due to its highly dynamic nature beyond the one-dimensional (1D) adiabatic theory model [R. L. Spencer et al., Phys. Fluids 26, 1564 (1983)]. In this work, magnetohydrodynamics (MHD) simulations on the magnetic compression of FRCs using the NIMROD code [C. R. Sovinec et al., J. Comput. Phys. 195, 355 (2004)] and their comparisons with the 1D theory have been performed. The effects of the assumptions of the theory on the compression process have been explored, and the detailed profiles of the FRC during compression have been investigated. The pressure evolution agrees with the theoretical prediction under various initial conditions. The axial contraction of the FRC can be affected by the initial density profile and the ramping rate of the compression magnetic field, but the theoretical predictions on the FRC's length in general and the relation (Equation presented) in particular hold approximately well during the whole compression process, where rs is the major radius of FRC separatrix and ro is that of the magnetic axis. The evolutions of the density and temperature can be affected significantly by the initial equilibrium profile and the ramping rate of the compression magnetic field. During the compression, the major radius of the FRC is another parameter that is susceptible to the ramping rate of the compression field. Basically, for the same magnetic compression ratio, the peak density is higher and the FRC's radius rs is smaller than the theoretical predictions. Copyright © 2022, The Authors. All rights reserved.

关键词： Forecasting

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