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2019 6th International Conference on Advanced Composite Materials and Manufacturing Engineering, ACMME 2019

作者： Ji, Kai Chen, Tingyang Long, Wenfeng He, Jinping National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan Institute of Marine Electric Propulsion Wuhan China

Multilevel current source converter has the benefits of high output capacity, low current switching stress and low harmonic or ripple content. This paper presents a new topology of three-level current-fed DC/DC converter for superconducting magnetic energy storage application. In this topology, a superconducting inductance acting as a constant current source and a shunt inductance acts as current divider ensure current flows through the power switch components equally to generate immediate level of current. A novel kind of pulse width modulation (PWM) switching strategy for the current instantaneous control of the current source converter was proposed. The modulation switching strategy proposed is able to effectively control the DC current output of the converter. Also, due to the both of proposed topology and control method are quite a simple, it can be easily realized in the practice. Simulation results prove the feasibility and validity of the proposed topology and modulation strategy. © Published under licence by IOP Publishing Ltd.

关键词： Topology

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Modeling of hybrid DC fuse based on piecewise fitting

Modeling of hybrid DC fuse based on piecewise fitting

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： S. Liu F. Ji S. Li W. Sun National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 People's Republic of China College of Electrical Engineering Naval University of Engineering Wuhan 430033 People's Republic of China

As a current limiting device, Hybird DC fuse can be used to limit the short-circuit current of the system, In order to precheck the current limiting capability, a simulation model of fuse needs to be established. However, the existing model is relatively complex, and there is no mature model that can be directly called in the existing simulation software. Therefore, this paper designs a piecewise fitting method based on the arcing test data of fuse to describe the whole process of arc drawing. First, considering the influence of resonance and other factors in the test data acquisition of the fuse breaking, the ripple is mixed, and a stepwise filtering algorithm is proposed; Then, according to the degree of fluctuation of the arcing curve, the piecewise points are selected using the normalized curvature criterion and the normalized residual norm criterion respectively, which solves the problem that the piecewise points rely on the designer's practical experience; Finally, according to the results of piecewise fitting, a fuse model of arcing resistance changing with time is constructed in PSCAD, and the simulation verifies the effectiveness of the method used.

关键词： arcs (electric) current limiters curve fitting data acquisition electric fuses power engineering computing short-circuit currents

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IGBT Failure mechanism and boundary analysis under large current and high temperature turn-off

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Journal of Physics: Conference Series 2021年第1期1754卷

作者： Xiao Ma Yongle Huang Yifei Luo National Key Laboratory of Science and Technology on Vessel Integrated Power System

Considering overload working conditions in electromagnetic emission, the paper presents a simulation of IGBT turn-off under large current and high temperature. Numerous simulation result is received under a specific test circuit. Boundary conditions for temperature, current and starry inductance are obtained under a set of temperature criterion. Further analysis proves that after temperature reaches the criterion, high current density path swiftly extends from local area to a vertical current path throughout the cells. This method for IGBT theoretical boundary is useful for similar projects or working conditions.

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Analysis of Electromagnetic Force of Linear Induction Motor with Segmented power Supply for Electromagnetic Emission

Analysis of Electromagnetic Force of Linear Induction Motor ...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Zhengqing Han Jin Xu Wanzhi Rui Lu Wang Guangbo Li National Key Laboratory of Science and Technology on Vessel Integrated Power System Department of the Naval Equipment Naval University of Engineering Wuhan China

ISBN: (数字)9781728167824

ISBN: (纸本)9781728167831

This paper introduces a linear induction motor with segmented power supply, which transforms the electric energy into the kinetic energy of the load movement in electromagnetic launch system. Based on the characteristics of electromagnetic emission mode, a special electromagnetic force analysis method of the motor is proposed. Firstly, considering secondary edge leakage, based on the principle of port equivalence, the equivalent circuit model is modified, and the calculation method of normal electromagnetic force of linear induction motor which is suitable for aperiodic transient operation in electromagnetic emission situation is analyzed. The accuracy of the method is verified by the finite element software. Secondly, combined with the kinematic model of Newton's second law, the relationship between the magnitude of electromagnetic force and the time of the stator in each section of the motor in the launching process is analyzed in detail, which lays the foundation for the dynamic response analysis and structural optimization design of the subsequent launching device.

关键词： electromagnetic emission linear induction motor with segmented power supply electromagnetic force kinematic model electromagnetic forces Electromagnetic projectiles Linear induction motors kinematics Electric power Source induction motors computational methods Optimal design

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Analysis of DAC impact on digital-controlled self-interference cancellation

Analysis of DAC impact on digital-controlled self-interferen...

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2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019

作者： Xing, Jinling Gel, Songhu Liu, Yongcai Wang, Qing Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan Hubei Province430033 China

ISBN: (纸本)9784885523229

Adaptive interference cancellation is an effective approach to enable full-duplex wireless communication in the multi-antenna co-site shipboard environments. Regarding the new digital-controlled cancellation implementation, the paper presents the system model, deduces the quantitative analytical expressions of interference suppression with and without DAC quantization noise, and conducts the waveform simulation verification. Analysis and simulation results show that the DAC quantization noise does not affect the system stability and convergence process, but do affect significantly the interference suppression performance if not designed appropriately. It is also shown that with appropriate parameter optimization, the DAC quantization noise would not be the limiting factor of system performance. © 2019 The Institute of Electronics, Information and Communication Engineer.

关键词： system stability

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An FPGA-based HF/VHF/UHF integrated self-interference cancellation system

An FPGA-based HF/VHF/UHF integrated self-interference cancel...

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2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019

作者： Xing, Jinling Liu, Yongcai Ge, Songhu Li, Yi Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan Hubei Province430033 China

ISBN: (纸本)9784885523229

The paper describes the design and performance of an FPGA-based interference cancellation system operating in the 2MHz-500MHz frequency band. The system adopts the RF direct bandpass sampling structure without down-converter introduced. The paper lays stress on the analysis and demonstration of feasibility and design consideration of bandpass sampling technique in the cancellation system, and presents the high speed FPGA realization of the low pass filter - a key module of the adaptive correlation algorithm. Experimental results show that average 64.2dB and 61.8dB suppression are achieved for the ideal sine-wave signal interference and amplitude-modulated signal interference, respectively, presenting an excellent cancellation performance of the proposed system. © 2019 The Institute of Electronics, Information and Communication Engineer.

关键词： Field programmable gate arrays (FPGA)

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Impact analysis of DRFM-based active jamming to radar detection efficiency

Impact analysis of DRFM-based active jamming to radar detect...

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IET International Radar Conference 2018, IRC 2018

作者： Liu, Wei Meng, Jin Zhou, Liang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

The influence of DRFM active jamming technology on pulse compression coherent radar is studied here. By establishing radar signal detection model and introducing radar equation, the influence of signal produced by DRFM on the detection performance of radar receiver is analysed, and the relationship between radar detection probability and interference power is obtained. Finally, the effective index for judging the jamming effect is summarised, and the range of effective jamming signal power is determined. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Radar receivers

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Research on flexible control algorithm for acceleration/deceleration in heavy-duty motion 2

Research on flexible control algorithm for acceleration/dece...

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2nd International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2019

作者： Yuan, Lei Xu, Mingjin Wu, Zhenxing Xu, Jin Naval University of Engineering Wuhan430033 China Nation Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430033 China

An algorithm for acceleration/deceleration control is proposed in this paper to improve the flexibility of the heavy-duty motion system. The algorithm is based on the five-segment S-type acceleration/deceleration curve. During the acceleration switching time, a circular arc is used to smooth the curve, and the running time of each stage could be reasonably allocated by cyclic iteration. A parameter is defined to quantify the degree of flexibility of the acceleration/deceleration process to match the actual project. This paper will build the model to compare the good and bad point of different algorithms. The result shows that the vibration and impact during the acceleration and deceleration process can be effectively reduced, which means that the flexibility of the system has been greatly improved. © 2019 IOP Publishing Ltd.

关键词： Acceleration

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A Wideband Linear-to-Circular Polarizer based on Hexagonal FSS on PDMS Substrate for CubeSats 4

A Wideband Linear-to-Circular Polarizer based on Hexagonal F...

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4th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2021

作者： Mirza, Hidayath Soh, Ping Jack Sheikh, Rais Ahmad Hossain, Toufiq M. Yan, Sen Zhang, Jiahao Luo, Fengyi Dept. of Electrical Engineering College of Engineering Jazan University Jazan Saudi Arabia Centre for Wireless Communications University of Oulu P.O. Box 4500 OuluFI-90014 Finland Dept. of Electrical Engineering College of Engineering Jazan University Jazan Saudi Arabia School of Engineering and Information Technology University of New South Wales Canberra CampbellACT2600 Australia School of Information and Communications Engineering Xi’an Jiaotong University Xi’an710049 China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665432030

A novel flexible single-layered and single-sided linear to-circular polarizer is proposed in this work. The proposed polarizer is designed for a deployable format for application in a 3U Cube Satellites. It features a near-zero 3 dB AR, with a size of 0. 22 λ0 × 0. 27λ0 × 0. 03λ0 and a 3dB AR fractional bandwidth of 34.39 %, starting from 1.95 GHz to 2.76 GHz. It performs with a conversion efficiency bandwidth covering 90% of 43.47 %, starting from 1.8 GHz to 2.8 GHz. This indicates the polarizer’s wideband CP performance, with a pure CP centered at 2.41 GHz. ©2021 IEEE

关键词： Frequency selective surfaces

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A Direct Control for Stand-Alone Operation Brushless Doubly Fed Induction Generator Using Sliding-Mode Control Approach

A Direct Control for Stand-Alone Operation Brushless Doubly ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Kai Ji Wenfeng Long Jinping He Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan Institute of Marine Electric Propulsion WuHan China

This paper presents a super-twisting sliding mode direct control (SSM-DC) strategy brushless doubly fed induction generator (BDFIG) for variable speed constant frequency wind energy conversion system. The proposed SSM-DC strategy employs a resonant based super-twisting sliding mode control scheme to directly control the required control winding stator voltage so as to eliminate the power winding stator flux instantaneous errors, without synchronous rotating coordinate transformation involving. The stability, robustness and convergence capability of the proposed control strategy were described and analyzed. Thank to no extra inner control loops involved, thus enhancing the transient performance. Constant converter switching frequency was achieved by using space vector modulation, which reduce the voltage harmonic of generator terminal. In addition, the feasibility and validity of the proposed scheme is prove by simulation results, then, enhanced transient performance and steady-state harmonic spectra is achieved.

关键词： Stator windings Resonant frequency Voltage control Harmonic analysis power system stability Windings

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