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检索条件"机构=Science and Technology on Ship Integrated Power System Technology Laboratory"

共 390 条记录，以下是51-60 订阅

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Physical Model of FS-IGBT Considering Dynamic Avalanche Electrical Characteristics and Analysis of Chip Non-uniform Stress

Physical Model of FS-IGBT Considering Dynamic Avalanche Elec...

引用

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

作者： Ma, Tianzhao Jia, Yingjie Luo, Yifei Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (纸本)9781728152240

Dynamic avalanche is the extreme operating condition of IGBT, and it has unique electrical characteristics in the switching off transient. In order to accurately characterize the turn off characteristics of IGBT, this paper proposes an improved method of traditional IGBT turn off physical model for dynamic avalanche phenomenon based on the physical mechanism of dynamic avalanche phenomenon and the multiplier effect after dynamic avalanche formation. Finally, according to the physical model, the uneven distribution of stress on the chip surface is analyzed, which provides the basis for IGBT model establishment and reliability analysis. © 2020 IEEE.

关键词： Dynamics

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Design and Simulation of an Air-Cored Permanent Magnet Direct-Driven Actuator for Missile 13

Design and Simulation of an Air-Cored Permanent Magnet Direc...

引用

13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Liu, Yingquan Lu, Junyong Long, Xinlin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728172101

Missile steering gear is the executive mechanism of missile control system, its performance directly affects the precision of missile guidance and control. An air-cored U-type permanent magnet linear motor is designed in this paper to simplify the structure of the missile steering system, reduce the connection cables and improve the reliability. The motor employs double side cambered PMs as excitation, and the air-cored coils directly drives the rudder blade. By canceling the reduction gear, the transmission efficiency of the steering system is enhanced. Moreover, the air-cored actuator can improve the response performance due to its light weight. The analytical thrust is derived in this paper. The design structure is optimized by finite element simulation. The transient calculation shows that the designed direct-driven actuator can achieve the expected thrust theoretically. © 2021 IEEE

关键词： Linear motors

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Position sensorless switching control strategy of SPMSMs based on fault tolerance of position sensor 6

Position sensorless switching control strategy of SPMSMs bas...

引用

6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Tan, Zexin Zhu, Junjie Wu, Zhicheng Xu, Jin Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (纸本)9798350346671

This paper proposes a switching method based on model reference adaptive system (MRAS) from position sensor control strategy to sensorless control strategy for surface permanent magnet synchronous motor (SPMSM) drives operating in medium and high velocity regions. The proposed switching method can effectively deal with the fault of the position sensor in SPMSM system, so as to improve its safety and stability. The sensor setting of control strategy consists of an actual sensor (position sensor) and the virtual sensor (MRAS). When the system position sensor has no fault, the feedback value of the position sensor has a greater weight on the information of the rotor position and velocity of the closed-loop system, while the weight of the MRAS estimated value is lower. When the position sensor fails, the information of the rotor position and velocity of the closed-loop system is provided by MRAS algorithm. Also, a linear weighted switching method is proposed, which can effectively reduce the motor fluctuation during the switching process. The feasibility of the proposed strategy is confirmed via simulations of SPMSM drive model in MATLAB/Simulink software. © 2023 IEEE.

关键词： Fault tolerance

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A GRU-Based Method of IGBT Module Degradation Prediction Under Changing Working Conditions

A GRU-Based Method of IGBT Module Degradation Prediction Und...

引用

2022 Global Reliability and Prognostics and Health Management Conference, PHM-Yantai 2022

作者： Feng, Xie Xin, Tang Haolan, Shen Yifei, Luo Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781665496315

ISBN: (纸本)9781665496315

Aiming at the problem that the traditional degradation prediction method of insulated gate bipolar transistor (IGBT) modules is difficult to be effectively applied under changing working conditions, a IGBT module degradation prediction method suitable for changing working conditions is proposed. Firstly, the aging test of IGBT modules is carried out by using a modified variable working conditions power cycle test platform. Secondly, the aging feature parameters and working condition influence parameters are selected through analyzing. Then, a degradation prediction method for IGBT modules under changing working conditions is presented based on Gated Recurrent Unit (GRU). Finally, the dataset collected by the test platform are used to verify the proposed method. The results show that compared with Long-Short-Term Memory (LSTM) network, GRU has lower complexity and greater efficiency. Meanwhile, the prediction accuracy of GRU is almost the same as LSTM. © 2022 IEEE.

关键词： Long short-term memory

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Modeling of Amplitude-phase Coupling Effect of Mixing Electronic Attenuator 19

Modeling of Amplitude-phase Coupling Effect of Mixing Electr...

引用

19th IEEE International Conference on Communication technology, ICCT 2019

作者： He, Fangmin Lu, Qiaran Wang, Qing Meng, Jin Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (纸本)9781728105352

The amplitude-phase coupling (APC) effect of the mixing electronic attenuator (MEA) is the main factor that limits its application in microwave interference cancellation system. The APC effect will cause the MEA to have an attenuation-dependent phase. In this paper, a mathematical model of MEA taking into account the APC effect is established by means of RF circuit equivalence. Simulations and experiments are also carried out to analyze the APC effect. The simulation and experiment results both verify the correctness of the proposed model. It is interesting to find that the phase deviation of output signal decreases oppositely with the increase of the input signal power. © 2019 IEEE.

关键词： Mixing

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Wide-band DOA Method with Sparse Array for Interference Cancellation 13

Wide-band DOA Method with Sparse Array for Interference Canc...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Guo, Yu Meng, Jin Gao, Hongzhang Ge, Songhu Li, Yaxing Yang, Kai National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665418126

The wide-band direction of arrival (DOA) method is proposed for interference cancellation when the frequency of communication is wide, which not only inherits high-precision advantage of multiple signal classification (MUSIC), but also introduces minimum redundancy array (MRA) for avoiding DOA ambiguity. Besides, calibration of channel and Jacobi mod-el with CORDIC rotation ensure accuracy of DOA in hardware. Hence, there will be a remarkable improvement of DOA accura-cy with wide-band working frequency. Implementation in hard-ware and numerical experiments demonstrate state-of-the-art performance of proposed method. It is ideal for DOA estimation in anti-interference of communication. © 2021 IEEE.

关键词： Multiple signal classification

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The Principle Analysis of Two-element Cross-eye Jamming Based on Phased Array

The Principle Analysis of Two-element Cross-eye Jamming Base...

引用

IET International Radar Conference 2023, IRC 2023

作者： Yang, Haonan Zhou, Liang Liu, Yongcai Su, Binbin Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781839539954

The application of phased array to radar jammer is helpful to improve the effective isotropic radiated power (EIRP) and the ability to counter multiple targets. Two-element cross-eye jammer based on phased array is significantly different from traditional two-element cross-eye jammer (TTCJ) and multiple-element cross-eye jammer (MCJ) in terms of antenna elements layout, circuit architecture and signal processing. However, there are no published literatures to analyse the principle of phased array two-element cross-eye jammer (PATCJ). Therefore, a mathematical model of PATCJ against mono-pulse radar is established in this paper, and the principle and feasibility of applying phased arrays to two-element cross-eye jammer are discussed. The cross-eye gain of PATCJ is derived. Besides, it is verified that the random selection of phase-shifting reference units (PRUs) will not affect the jamming performance of PATCJ. The research results of this paper have guiding significance for the engineering realization of PATCJ. © The Institution of Engineering & technology 2023.

关键词： Antenna phased arrays

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Research on Characteristics Analysis and Suppression Method of Short Circuit Fault of Coaxial Cable in Electromagnetic Launch 4

Research on Characteristics Analysis and Suppression Method ...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Cui, Junwei Zhang, Xiao Lu, Junyong Dai, Yufeng National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728171494

In electromagnetic launch systems, coaxial cables are used for energy transmission from the power supply to the launcher. Once the cable has a short-circuit fault, it will cause the cable to over-current or even explode, causing the launch to fail. This paper first established the dynamic launch model of the capacitive energy storage electromagnetic launch system, and analyzed in detail the influence of the coaxial cable short-circuit fault location on the load current, projectile exit speed, and coaxial cable current. The results show that the closer the short-circuit fault location is to the load side, The larger the cable fault current, the smaller the projectile exit *** 1m the cable fault current reached 1.9 times the normal current, resulting in a 76% drop in exit ***,an electromagnetic launch system model with a high-temperature superconducting current limiter was established,and the installation position of the current limiter was optimized. The fault current before and after the installation of the current limiter was simulated and compared. The results showed that: after the current limiter was added, the cable short-circuit current The peak value dropped by 29%, and the projectile exit speed was reduced by 61 % compared to normal conditions, which can effectively reduce the impact of short-circuit current on the cable, increase the projectile exit speed, and provide guidance for the safety design of the electromagnetic launch system. © 2021 IEEE.

关键词： Projectiles

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Application of mixer based vector modulator in microwave interference cancellation system 2

Application of mixer based vector modulator in microwave int...

引用

2nd IEEE International Conference on Electronics technology, ICET 2019

作者： Lu, Qiaran He, Fangmin Li, Yi Wang, Qing Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728116181

At present, a large number of electronic informationplatforms are equipped with many kind of electronic devices. Different devices work at the same time, causing serious interference with each other, and the interference has the characteristics of complex coupling path and large dynamic range of coupling degree change. Recently, the widely used cancellation technology can hardly meet the needs. The mixer based vector modulator has a wide operating bandwidth and a large dynamic range of amplitude modulation. In this paper, a mixer based vector modulator is applied to the microwave interference cancellation system to eliminate the interference of large dynamic changes in the coupling degree between electronic devices. The feasibility of the microwave interference cancellation technology based on the mixed vector modulator is verified by theoretical analysis and experiment. Designed and implemented a type of microwave interference cancellation system based on a mixer vector modulator with a working bandwidth of 3.5 GHz to 4.5 GHz, which can achieve interference cancellation of 38 dB66 dB under the condition of wide range of interference coupling 20 dB60 dB, and the cancellation speed is up to 20dB/50us. © 2019 IEEE.

关键词： Microwaves

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Transient power Sharing Control Algorithm between Virtual Synchronous Generator and Diesel Generator in Isolated Microgrid 5

Transient Power Sharing Control Algorithm between Virtual Sy...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Chun Ma, Fan Hu, Qi Hao, Xiaoliang Xiao, Runlong Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Mixed-source isolated microgrid is usually composed of renewable energy, energy storage devices and diesel generators (DGs). Virtual synchronous generator (VSG) has been developed recently years. In such an isolated microgrid, transient power cannot be shared due to the faster response of the VSGs, which may cause the overcurrent of the VSGs. Inverter capacity can not be fully utilized. To solve this problem, first, the cause of unequal transient load sharing is analyzed. Then, an improved VSG control algorithm is proposed. The speed governor characteristics of DG is added in VSG, and the virtual impedance of VSG is designed. Finally, the proposed control algorithm is validated by simulation. © 2022 IEEE.

关键词： Synchronous generators

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