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

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Analysis of Eddy-Current Loss and its Reduction in a Conduction-Cooled HTS Magnet 3

Analysis of Eddy-Current Loss and its Reduction in a Conduct...

引用

3rd International Symposium on Resource Exploration and Environmental science, REES 2019

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

Since conduction cooling system is environmental friendly and easy operating, the conduction-cooled method is widely used in cryogenic cooling system of higherature superconducting (HTS) magnet. The eddy-current losses are generated in the cooling structures when HTS magnet is charging and discharging or the current in the magnet is alternating. In this paper, a 3D model of analyzing the eddy-current loss was built. The eddy-current losses of a HTS magnet with different cooling structures were calculated. Thermal analysis of the HTS magnet was carried out together with the electromagnetic analysis. The effect of the cooling structures' geometric parameters on the eddy-current losses was discussed. The methods of reducing the eddy-current loss were proposed. The analysis results demonstrate that the optimization of the geometric parameters would greatly benefit the reduction of the eddy-current losses. © Published under licence by IOP Publishing Ltd.

关键词： Superconducting magnets

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Research on Topology and Modulation Control Method of a Novel Three-Level Current-Fed DCDC Converter 6

Research on Topology and Modulation Control Method of a Nove...

引用

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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Modulation and Voltage Balance Control of a Four-Level ANPC H-Bridge Converter for ship Medium-Voltage Propulsion systems

Modulation and Voltage Balance Control of a Four-Level ANPC ...

引用

2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Zhou, Wei Fang, Huasong Liu, Nianzhou Wang, Kui Zheng, Zedong Li, Yongdong Tsinghua University Department of Electrical Enginerring Beijing China Wuhan Institute of Marine Electric Propulsion Science and Technology on Ship Intergrated Power System Technology Laboratory Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

Aiming at a new generation of medium voltage DC (MVDC) power propulsion system for new ship integrated power system (IPS), this paper proposes an active neutral-point-clamped (ANPC) H-bridge structure, which directly connects two four-level ANPC topologies. Without any flying capacitors, this topology has high power density, and can be used in 6 kV voltage level. To address the problem of unbalanced neutral-point (NP) voltage, this paper derives a mathematical model of NP voltage and uses a combination of COPWM modulation strategy and fine-tuned duty cycle to achieve balanced control of the NP voltage by software. Simulation and experimental results prove the rationality and validity of the proposed method. © 2022 IEEE.

关键词： Topology

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Period Energy Method to Detect Demagnetization Failure of Surface Mounted Permanent Magnet Motor with Search Coil 16th

Period Energy Method to Detect Demagnetization Failure of Su...

引用

16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： huang, Wen Hu, Jinghua National Key Laboratory of Science and Technology on Vessel Integrated Power System No.717 Jiefang Avenue Qiaokou District Wuhan China

ISBN: (纸本)9789811915314

Permanent magnet synchronous motors are widely used in major fields such as aerospace, wind power generation, high-end manufacturing, national defense, and military industry due to its many advantages. The stability of permanent magnet materials will be affected by factors such as temperature, external magnetic field, acid-base corrosion, and manufacturing defects, resulting in uniform demagnetization or partial demagnetization failures. Demagnetization fault is a unique fault of permanent magnet motor. It will reduce operating efficiency, increase torque ripple, and deteriorate vibration performance. This paper studies the change of the "period energy" in search coil caused by demagnetization. When the permanent magnet is demagnetized, the asymmetry of the rotor magnetic field makes the "period energy" in the search coil no longer zero, and its amplitude proportional to the failure degree. The equivalent surface current method is used in the calculation of the air gap magnetic field due to its intuitive physical meaning and the advantages of calculation speed. Based on the acquisition of the air gap magnetic field, the induced voltage of the search coil is obtained based on the law of electromagnetic induction and the "period energy" is calculated to diagnose magnet’s fault. The comparison with the finite element and simulation results shows that the method proposed in this paper can effectively monitor the permanent magnet demagnetization failure and quantitatively evaluate the degree of loss of magnetization. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Permanent magnets

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Lithium-ion Batteries RUL Prediction Based on Temporal Pattern Attention 15

Lithium-ion Batteries RUL Prediction Based on Temporal Patte...

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2022 15th International Conference on Computer and Electrical Engineering, ICCEE 2022

作者： Qin, Haochen Fan, Xuexin Fan, Yaxiang Wang, Ruitian Tian, Fengyuan National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering 717 Jiefang Avenue 430033 China

Accurate prediction of battery remaining useful life (RUL) under various operating conditions is essential for battery management systems to evaluate battery reliability, reduce the risk of battery usage and provide a rationale for battery maintenance. However, RUL prediction is a challenging problem since battery degradation is a nonlinear process and is influenced by external factors. In order to improve the prediction speed and accuracy, the research proposes a new Li-ion batteries RUL prediction method based on temporal pattern attention-based, which can take into account the influence of different variables for prediction. To model time-invariant patterns across multiple time steps, it combines a gated recurrent unit (GRU), a convolutional neural network, and an attention mechanism. Battery capacity, impedance and temperature are taken as input to train the model. Experiments are validated on public datasets and the results are compared with state of art methods. The experimental results show that the proposed method achieves the lowest MAE with 8.99, which proves the effectiveness of the method. © 2022 Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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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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INFLUENCE OF MOTOR AIR-GAP ECCENTRICITY ON THE VIBRATION OF ROTOR WITH ASYMMETRIC STIFFNESS 28

INFLUENCE OF MOTOR AIR-GAP ECCENTRICITY ON THE VIBRATION OF ...

引用

28th International Congress on Sound and Vibration, ICSV 2022

作者： Hu, Yuchao Wang, Xing Li, Wenyin Hu, Jinghua National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Hubei Province Wuhan430033 China

ISBN: (纸本)9789811850707

In motors, the electromagnetic forces and mechanical forces are usually considered as independent vibration sources, and their coupling mechanism is seldom investigated. In this paper, the influence of unbalanced magnetic pull (UMP) caused by motor air-gap eccentricity on mechanical force excitation of rotor is studied for a permanent magnet synchronous motors (PMSM). The components of electromagnetic forces in multiple pole-pairs motor with a static eccentricity in air-gap is firstly analyzed. Considering the mass eccentricity and asymmetric stiffness of rotor, a nonlinear dynamics model with UMP is established. Multi-scale method is used to solve the nonlinear equation. The results reveal that the component of double rotation frequency vibration (2X) occurs when considering asymmetric stiffness. However, the amplitude of 2X component corresponds to the UMP force. Experiments are carried out on a six pole-pairs permanent magnet synchronous motor. The result shows that the amplitude of 2X component has a positive correlation within small air-gap eccentricity, which verifies the analytical conclusions. © International Institute of Acoustics and Vibration (IIAV), 2022.

关键词： Stiffness

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Analysis of the impact of long-term service of inverter devices on electromagnetic compatibility 2

Analysis of the impact of long-term service of inverter devi...

引用

2nd China power Supply Society Electromagnetic Compatibility Conference, CPEMC 2024

作者： Zhang, Ruiheng Pei, Xuejun Meng, Jin Fan, Hongming Zhou, Peng Yuan, Yuzhang Power Electronics and Energy Management Key Laboratory Ministry of Education of China Huazhong University of Science and Technology Wuhan China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9798331509552

Taking the IGBT power module of the inverter device as the research object, finite element analysis technology was used to explore the influence of long-term service on the thermal characteristics and stress-strain of the IGBT module. At the same time, the influence of service aging on the electromagnetic compatibility performance of the device was studied, and the finite element simulation results were verified through accelerated aging experiments. The results showed that during the long-term operation of the IGBT module, due to the different thermal expansion coefficients of its materials, strain differences were found, ultimately leading to an increase in its ground capacitance, resulting in an increase in the amplitude of the common mode conducted noise of the device by 3dBμA in the frequency band after 20MHz. This study will provide theoretical guidance for the electromagnetic compatibility design of inverter devices for long-term service. ©2024 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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An RNN-EKF Observer for Time Delay of Large-Scale Motor Control system 10

An RNN-EKF Observer for Time Delay of Large-Scale Motor Cont...

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10th IEEE Joint International Information technology and Artificial Intelligence Conference, ITAIC 2022

作者： Song, Lin Nie, Ziling Xu, Jie Song, Zelin Li, Huayu Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China Taiyuan University of Technology of Shanxi Province Taiyuan China

ISBN: (数字)9781665422079

ISBN: (纸本)9781665422079

For a large-scale motor control system with non-negligible time delay, a Recursive Neural Network- Extended Kalman Filter (RNN-EKF) observer is proposed to estimate the flux and reduce the disturbance caused by the time delay. In this paper, the motor model is designed to simulate the actual operating conditions: the motor resistance varies with temperature and time delay is considered in the current loop. The proposed observer combines the RNN with EKF algorithm, aiming at reducing the error between the observed flux and the actual flux by training weight coefficients of the neural network. Simulation results show that the proposed observer owns good static and transient control performance. In addition, the effect of the unknown time delay is effectively reduced. © 2022 IEEE.

关键词： Time delay

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