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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81-90 订阅

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Study on Doppler Frequency Offset Estimation Algorithm for High Speed Maglev 3

Study on Doppler Frequency Offset Estimation Algorithm for H...

引用

3rd IEEE International Conference on Communications, Information system and Computer Engineering, CISCE 2021

作者： Liao, Tao Meng, Qingyun Liu, Cang Zhang, Mingyuan Li, Bing National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9780738112152

In the high-speed maglev scenario, the Doppler frequency offset of wireless communication is large, and the channel is fast time-varying, the existing frequency offset estimation algorithms are difficult to meet the engineering application requirements. This paper proposes a frequency offset estimation algorithm based on 5G PT-RS (Phase Tracking Reference Signal), which utilizes the locally known PT-RS and the received signal to perform two correlation operations to obtain the phase difference and estimate the Doppler frequency offset. Without additional pilot data, it can improve the frequency offset tracking speed in fast time-varying channel environment, and the estimation range can reach one subcarrier spacing, which can support the Doppler frequency offset estimation requirements at the maximum moving speed of 1200km/h. © 2021 IEEE.

关键词： Frequency estimation

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Impacts of phase noise on the performance of adaptive side-lobe cancellation system 4

Impacts of phase noise on the performance of adaptive side-l...

引用

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

作者： Zhou, Minglei Wang, Qing He, Fangmin Zhang, Yunshuo Luo, Kang Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665432030

Adaptive side-lobe cancellation (SLC) is an effective means of anti-jamming in communication systems. To realize SLC in digital domain, down-conversion is required to convert the signals into baseband. However, down-conversion circuits introduce phase noise into the output signals, which degrades the SLC performance. This paper establishes new mathematical models of SLC taking into account phase noise to quantify the impacts of phase noise of different levels. The theoretical models are verified by simulations. The simulation results show that phase noise is a critical factor that limits the interference cancellation ratio (ICR) of SLC. In addition, the effect of phase noise is not related with the specific form of the received signals, but only the level of phase noise. The theoretical models in our paper can be used to find the required phase noise levels to meet the required SLC performance. ©2021 IEEE

关键词： Phase noise

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A Novel Circulating Current Suppression Strategy of Parallel Three-level Inverters in Flywheel Energy Storage system with Zero-sequence Voltage Injection

A Novel Circulating Current Suppression Strategy of Parallel...

引用

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

作者： Li, Zhongrui Nie, Ziling Ai, Sheng Xu, Jie Cao, Meihe Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

The parallel operation of three-level inverters can increase the power rating for flywheel energy storage system. However, the zero-sequence circulating current inevitably emerges owing to the excitation of the common-mode voltage difference, which can lead to current distortion and system loss. In addition, parallel three-level inverters have nonlinear characteristics, which can affect the zero-sequence circulating current. Therefore, a novel circulating current suppression strategy with zero-sequence voltage injection is proposed in this paper. A nonlinear equivalent model of the common-mode voltage difference is developed. Then, the zero-sequence voltage injection method is used to suppress the zero-sequence circulating current. Compared with the traditional suppression strategy, the novel strategy can achieve better performance. Simulation and experimental results prove the validity of the theoretical analysis and the feasibility of the proposed strategy. © 2022 IEEE.

关键词： Flywheels

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Modeling and Force Fluctuation Analysis of Open Winding PMLSM Driven by Dual-terminal 13

Modeling and Force Fluctuation Analysis of Open Winding PMLS...

引用

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

作者： Deng, Chen Zhou, Liang Yan, Ming Han, Jinyang Zhong, Ying Li, Weichao National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728172101

The open winding motor system is a dual-terminal power supply topology structure, which is formed by opening the midpoint of the phase winding and driving each terminal with a converter. It has many advantages, such as high utilization rate of DC voltage, flexible control mode, strong redundancy and fault tolerance. The converter at both ends of the topology can adopt two DC power supply modes: independent bus and common bus, and the circuit structure is different. In this paper, firstly, the mathematical models of PMLSM in ABC coordinate system under two kinds of power supply modes are derived, and the mechanism of force fluctuation caused by asymmetric impedance of primary winding and harmonic of secondary permanent magnet flux linkage is analyzed. Based on this, the main focus and control strategy of force fluctuation suppression under two kinds of power supply modes are further analyzed. Finally, the correctness of the analysis is proved by system simulation. © 2021 IEEE

关键词： Flux linkage

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Wideband Adaptive Interference Cancellation in Spread-Spectrum Communication with Subband Bandwidth Design 9

Wideband Adaptive Interference Cancellation in Spread-Spectr...

引用

9th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2022

作者： Zhang, Yunshuo He, Fangmin Lu, Qiaran Li, Zheyu Liu, Hongbo Meng, Jin Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781665427753

ISBN: (纸本)9781665427753

The bandwidth ratio increasing of spread spectrum (SS) communication limits the performance of wideband adaptive interference cancellation (WAIC) for strong wideband interference signal. To improve the interference cancellation radio (ICR), wideband interference signal is divided into subbands to reduce the computational bandwidth of the WAIC algorithm. In this paper, a method that fits the wideband interference signal by multi-tone signals is proposed to explicitly analyze the effect of the signal bandwidth on the cancellation system and quantitatively calculate the analytical solution of the ICR. Basing on the method proposed, the performance can be evaluated by the amplitude and phase difference between the received signals from the main antenna and the auxiliary antenna. Simulations and experiments are conducted to verify the theoretical analysis, and the results are consistent. Therefore, the analytical method proposed in this paper provides the design guidelines between the ICR requirement and subband bandwidth, which can reduce the complexity in the implementation of the WAIC system. © 2022 IEEE.

关键词： Spectroscopy

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Life prediction of pulse capacitor based on BP neural network method 4

Life prediction of pulse capacitor based on BP neural networ...

引用

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

作者： Wang, Xin Zhang, Xiao Zhu, Bofeng Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (纸本)9781728171494

As the core component of pulse power supply, the life and reliability of pulse capacitor is one of the most important characteristics. Due to many factors that affect the life of the capacitor and the complex state equation, the life model of pulse capacitor is established based on the BP neural network method. Firstly, a life test platform for pulsed power capacitors was established, and life tests were performed on 5 capacitors;Secondly, a BP neural network model was established, using the experimental data of capacitor 1 as training data, after training the neural network model, the life of remaining 4 capacitors was predicted. Finally, the predicted results are compared with the actual experimental results, and the life of capacitor is obtained from the variation of the capacitance value. The error between the predicted data and the experimental data is within 5%, which verifies the accuracy of the life prediction model. This method can be used to predict the life of the capacitor, evaluate the performance and status of capacitor, and improve the stability and reliability of pulse power system. © 2021 IEEE.

关键词： Capacitance

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The charging and discharging balance control strategy of power batteries for hybrid energy storage

The charging and discharging balance control strategy of pow...

引用

2016 International Symposium on power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2016

作者： Ren, Zhou Lu, Junyong Wang, Guangsen Long, Xinlin Xiao, Zhang Chao, Li National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781509020676

shipboard hybrid energy storage power system includes tens of thousands of single batteries. The performance of each single cell can't be completely consistent. Small differences will gradually increase after repeated charging and discharging, which may lead to a sharp decline of the performance and the cycle life of the battery. For imbalance performance between each single cell of shipboard hybrid energy storage, this paper proposes a multi-mode balance control method, which integrates fuzzy PID charging equalizer, sequential discharging equalizer and floating charging equalizer, in order to reduce the differences between the battery packs. According to the proposed balance control strategy, this paper takes an experiment on the battery packs for hybrid energy storage which are composed of lead-acid batteries, and achieves a better balance result. © 2016 IEEE.

关键词： Equalizers

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Analysis of the influence of delay mismatch on microwave interference adaptive cancellation system

Analysis of the influence of delay mismatch on microwave int...

引用

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

作者： Qin, Huanding He, Fangmin Meng, Jin Wu, Hao Cui, Zhongpu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9784885523229

Delay mismatch has greatly effect on the microwave interference adaptive cancellation system. And with higher operating frequency of the system comes more sensitivity to the influence of delay mismatch. This paper analyzes the impact of delay mismatch on the performance of microwave interference adaptive cancellation system. First, the mathematical model of the system with delay mismatch is established, and the allowable delay mismatch range under the system stability condition is given. Second, the influence of delay mismatch on system convergence speed and interference cancellation ratio (ICR) is analyzed. Both the simulation and experiment results verify the correctness of the theoretical analysis. © 2019 The Institute of Electronics, Information and Communication Engineer.

关键词： Microwaves

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Research on Topology Design and Configuration optimization of Hybrid Energy Storage system 5

Research on Topology Design and Configuration optimization o...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Wu, Zhicheng Zhu, Junjie Sun, Xingfa Han, Yi Xu, Jin Yuan, Jingxin 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

When hybrid energy storage technology is applied in different occasions, there are key problems in topology design and configuration optimization. For electromagnetic emission application scenarios with strict volume-weight constraints and large power-energy requirements, a hybrid energy storage group chopper discharge topology is designed, and its working principle and operation boundary are introduced. Then, taking the single maximum power demand, continuous maximum energy demand and multiple constraints of the transmitting load as the design input, the optimal con-figuration of supercapacitor and lithium battery is carried out. Taking the weight, volume and cost as the comprehensive optimization objectives, iterative approximation is carried out, and finally the optimal configuration solution of the hybrid energy storage system is obtained. The effectiveness of the topology is verified by simulation. © 2022 IEEE.

关键词： Choppers (circuits)

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Investigation on the 36MVA PP-IGBT-Based power Converter for High-Speed Maglev Applications 13

Investigation on the 36MVA PP-IGBT-Based Power Converter for...

引用

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

作者： Zhou, Liang Deng, Chen Li, Weichao Yan, Ming Han, Jinyang Zhong, Ying National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728172101

Press-pack insulated gate bipolar transistors (PP-IGBTs) are a more attractive choice for high-power converters, due to increased current ratings, and an inherent short-circuit failure mode. This paper shows how a power electronics building block (PEBB) based on PP-IGBTs has been carefully designed and assembled to build a 36MVA power converter for high-speed maglev applications. The minimization of the stay inductance, the equalization of power loss and snubberless operation are within the main technical design requisites. Simulation and experiment results show that the developed PEBB based on PP-IGBTs is proved to be suitable for the 36MVA power converter. © 2021 IEEE

关键词： power converters

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