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International Conference on Electronics technology (ICET)

作者： Fangyuan Li Huaiguang Gu Jiapei Zhou Yang Gao State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

This paper is aimed at the research and verification requirements of fault current suppression devices applied in DC grids as actual physical test equipment. A joint test method based on digital and physical hybrid simulation is proposed, and a digital physical interface scheme is provided. It has engineering practical digital physical interface stability and accuracy, and plays a technical support role in the development of fault current suppression devices in DC grids. A fault current suppression branch is proposed for the combination of a current limiter and a high-voltage DC circuit breaker. The testing topology, main circuit interface, communication interface, and communication protocol requirements for the digital physical hybrid simulation of the fault suppression branch are proposed, and a platform for the connection of the current limiting device is developed. The experiment results show that after adding a current limiter to the current limiting branch, the maximum fault current decreases, the breaking current of the circuit breaker is reduced, and the requirements for the technical parameters of the circuit breaker are lowered.

关键词： Low voltage Limiting Protocols Circuit breakers Power system dynamics Power grids Topology

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Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

Research on Simulation Modeling Method of New Distributing N...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Gu, Huaiguang Kou, Longze Zhu, Lin Gao, Yuqin Gao, Yang Xiong, Ping State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Changping Beijing102209 China State Grid Hubei Electric Power Research Institute Hongshan District Hubei Province Wuhan City430015 China

ISBN: (纸本)9798350300222

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed;Each simulation model is shown. © 2023 IEEE.

关键词： Electric power distribution

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Impacts of synoptic circulation on surface ozone pollution in a coastal eco-city in Southeastern China during 2014-2019

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Journal of Environmental Sciences 2023年第5期127卷 143-157页

作者： Yu Yan Xuesong Wang Zhengchao Huang Kun Qu Wenbin Shi Zimu Peng Limin Zeng Shaodong Xie Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China International Joint Laboratory for Regional Pollution Control Ministry of EducationBeijing 100816China Center for Environmental Education and Communications of Ministry of Ecology and Environment Beijing 100020China Beijing Innovation Center for Engineering Science and Advanced Technology Peking UniversityBeijing 100871China CAS Center for Excellence in Regional Atmospheric Environment Chinese Academy of SciencesXiamen 361021China

The coastal eco-city of Fuzhou in Southeastern China has experienced severe ozone(O_(3))episodes at times in recent *** this study,three typical synoptic circulations types(CTs)that influenced more than 80%of O_(3) polluted days in Fuzhou during 2014-2019 were identified using a subjective *** characteristics of meteorological conditions linked to photochemical formation and transport of O_(3) under the three CTs were *** Air Quality Model with extensions was applied to simulate O_(3) episodes and to quantify O_(3) sources from different regions in *** Fuzhou was located to the west of a high-pressure system(classified as“East-ridge”),more warm southwesterly currents flowed to Fuzhou,and the effects of cross-regional transport from Guangdong province and high local production promoted the occurrence of O_(3) *** a uniform pressure field with a low-pressure system occurring to the east of Fuzhou(defined as“East-low”),stagnant weather conditions caused the strongest local production of O_(3) in the atmospheric boundary *** by high-pressure systems over the mainland(categorized as“Inland-high”),northerly airflows enhanced the contribution of cross-regional transport to O_(3) in *** abnormal increases of the“East-ridge”and“Inland-high”were closely related to O_(3) pollution in Fuzhou in April and May 2018,resulting in the annual maximum number of O_(3) polluted days during recent ***,the rising number of autumn O_(3) episodes in 2017-2019 was mainly related to the“Inland-high”,indicating the aggravation of cross-regional transport and highlighting the necessity of enhanced regional collaboration and efforts in combating O_(3) pollution.

关键词： Ozone pollution Synoptic circulation Regional transport Chemical production

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Frequency Modulation Strategy of Wind Power Generation in Power System of High Renewable Penetration

Frequency Modulation Strategy of Wind Power Generation in Po...

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2023 International Conference on Power Energy Systems and Applications, ICoPESA 2023

作者： Chi, Chengbin Liu, Shan Liu, Qi Li, Fan State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing Key Laboratory of Dc Grid Technology and Simulation Beijing China State Grid Shanghai Municipal Electric Power Compan Shanghai China

ISBN: (纸本)9798350345605

Wind turbines generally adopt the maximum wind energy tracking control strategy, which makes them obtain the best power generation efficiency. However, this makes wind turbines unable to respond to changes in system conditions, provide inertial support for the system, and participate in the primary frequency modulation of the system, which brings challenges to the frequency safety of high-proportion new energy power systems. In order to improve the frequency stability of high-proportion new energy power system and make wind turbines participate in frequency control actively, this paper proposes a primary frequency modulation control strategy based on load reduction for doubly-fed wind turbines. According to the aerodynamic characteristics of variable pitch wind turbine, a coordinated load shedding control strategy combining variable pitch and variable speed operation was proposed to make the wind turbine have active power reserve capacity. A frequency response link is added to the power control, so that the unit can output power to realize inertia and frequency support when the system frequency fluctuates. The simulation results show that the proposed control strategy can improve the system inertia and primary frequency modulation capability in the full wind speed operating domain under the load mutation condition, and improve the frequency stability of the system after the wind turbine is connected to the grid. © 2023 IEEE.

关键词： Frequency modulation

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Acoustic and Vibration Response and Fatigue Life Analysis of Thin-Walled Connection Structures Under Heat Flow Conditions

SSRN

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SSRN 2024年

作者： Sha, Yundong Zhao, Wenqiang Tang, Xiaoning Zhao, Fengtong Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace University Shenyang110136 China

Thin-walled connection structures are commonly used in the hot-end components of aerospace vehicles. Large deflection nonlinear responses and fatigue failure occur due to their discontinuous mass distribution and prominent cross-sectional changes under the action of complex thermal, aerodynamic, and noise loads. A thermoacoustic fatigue test was carried out to obtain the acoustic and vibration responses and fatigue life changes of the connection structure under heat flow conditions in engineering applications. The high-temperature acoustic fatigue test system of aviation thin-walled structures was used, taking the high-temperature alloy thin-walled plate-load-bearing frame bolted connection structure as the research object. As a result, the vibration response and fatigue life under different thermoacoustic loads were obtained. The contact finite element method was used to simulate the connection pretightening force, and the coupled finite element/boundary element method was used to calculate the acoustic and vibration response of heat flow conditions. The changing rules of the frequency response peak value at the critical point of the thin-walled connection structure under the effects of different temperature fields, fluid fields, and sound fields were obtained through the processing and analysis of the calculation results. Considering the structural vibration fatigue damage mechanism, this study employed an improved rainflow counting method to compute the rainflow circulation matrix (RFM) and rainflow damage matrix (RFD) of the vibration stress time history at critical points within the structure framework. Said method was combined with Miner's linear cumulative damage theory to estimate the fatigue life under various thermal-fluid-acoustic coupled loads. A comprehensive analysis validates the accuracy of the established numerical simulation calculation model in identifying critical connection points within structures subjected to pre-tightening forces. This model

关键词： Heat transfer

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Magnetic control of nonreciprocal charge transport

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Physical Review B 2025年第15期111卷 155411-155411页

作者： Xu Chen Yuhao Fu Xianjie Wang Yu Sui Hong Jian Zhao L. L. Tao School of Physics Harbin Institute of Technology Harbin 150001 China Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun 130012 China Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Devices Harbin 150001 China

Nonreciprocal charge transport (NCT) characterized by unequal resistances for opposite current direction enriches the fundamental physics of electron transport and is promising for potential device applications. Here, we report on a study on the magnetic control of the NCT in two-dimensional systems with different types of spin-orbit coupling (SOC). Based on the Boltzmann transport theory, we first study this effect using a general Hamiltonian model and show that the nonlinear conductivity can be efficiently tuned by the exchange field. In particular, the exchange-field orientation dependence of the nonlinear conductivity reveals significantly distinct relations for different SOCs. We further derive the analytical expressions with the weak-field approximation, which are in good accordance with numerical results. Then, we exemplify this phenomenon in the Ag2Te/Cr2O3 surface based on density functional theory calculations. We predict that the nonlinear conductivity in such a system strongly depends on the surface magnetization orientation of the Cr2O3 layer. Those findings also suggest that measuring the NCT as a function of the exchange-field orientation provides a simple electrical means to quantify the SOC type. Our results are expected to provide a valuable insight into the NCT physics and open avenues for future rectifying devices.

关键词： Spin orbit coupling

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Automatic Inverse Synthetic Aperture Radar Ship Targets Recognition using Simple Multiple Kernel Learning: Automatic ISAR Ship Targets Recognition using Simple-MKL 24

Automatic Inverse Synthetic Aperture Radar Ship Targets Reco...

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Proceedings of the 2024 4th International Conference on Big Data, Artificial Intelligence and Risk Management

作者： Yuan Wu Fulin Su Xue Li Peipei Zhu Xunwei Xie National Key Laboratory of Complex Aviation System Simulation Southwest China Institute of Electronic Technology Chengdu Sichuan China School of Electronics and Information Engineering Harbin Institute of Technology Harbin Heilongjiang China

ISBN: (纸本)9798400709753

In radar automatic target recognition (RATR), inverse synthetic aperture radar (ISAR) image recognition shows its advantages. Due to the limited sample size of ISAR images, support vector machine (SVM), known for its robustness in small sample classification, is often used for ISAR image recognition. For ISAR images of different targets, the single kernel SVM algorithm might lose its robustness. Therefore, this paper applies multiple kernel learning (MKL) to ISAR ship target recognition. The process begins with the preprocessing of the ISAR images to suppress Gaussian white noise. Then, principal component analysis (PCA) is employed to extract features from the ISAR images. Finally, the Simple-MKL method is used to recognize the samples. Experiments based on simulation data indicate that the method used in this paper improves the accuracy compared to other single-kernel SVM algorithms with different kernel functions.

关键词： Inverse Synthetic Aperture Radar (ISAR)

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BiGRU-Attention-Based Specific Emitter Identification Method

BiGRU-Attention-Based Specific Emitter Identification Method

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Robotics, Intelligent Control and Artificial Intelligence (RICAI), International Conference on

作者： Rongling Xiong National Key Laboratory of Complex Aviation System Simulation Chengdu China The 10th Research Institute of China Electronics Technology Group Corporation Chengdu China

ISBN: (数字)9798331541699

ISBN: (纸本)9798331541705

Specific emitter identification plays a pivotal role in electronic countermeasures within the realm of complex electromagnetic environments. This study introduces a novel method for specific emitter identification, leveraging the capabilities of BiGRU-Attention (BiGRU-Att). The process begins with the segmentation of steady-state signal slices from the targeted emitter. Subsequently, six distinct features, including wavelet entropy and amplitude skewness within the timefrequency domain, are meticulously extracted. These extracted sequence feature data are then employed to train the model, culminating in the acquisition of the identification outcome. The methodology was rigorously tested using TETRA communication signals from nine distinct emitters. Experimental findings affirm that the model proficiently harnesses the timing information inherent in the specific emitter's signal, substantially enhancing the identification accuracy. This approach not only underscores the effectiveness of integrating BiGRU and attention mechanisms for signal classification but also sets a precedent for future research in specific emitter identification under intricate electromagnetic conditions.

关键词： Attention mechanisms Accuracy Wavelet domain Signal processing Feature extraction Entropy Timing Steady-state Electromagnetics Time-domain analysis

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Scattering of SH waves by a scalene triangular hill with a shallow cavity in half-space

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Earthquake Engineering and Engineering Vibration 2022年第4期21卷 877-897页

作者： Sun Yingchao Yang Zailin Yang Yong Wang Guangyi College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China AVIC-HONGDU Nanchang 330024China Key Laboratory of Advanced Material of Ship and Mechanics Ministry of Industry and Information TechnologyHarbin Engineering UniversityHarbin 150001China Engineering Research Institute of Appraisal and Strengthening Shandong Jianzhu UniversityJinan 250101China Jiangxi Technology Innovation Center of Advanced Aviation Structure and System Integration Nanchang 330024China

In this study,a theoretical approach is used to investigate the scattering problem of circular holes under a scalene triangle on the *** wave displacement function is obtained by solving the Helmholtz equation that meets the zero-stress boundary conditions by adopting the method of separation of *** on the complex function,multi-polar coordinate method,and region-matching technique,algebraic equations are established at auxiliary boundaries and free boundaries conditions in a complex *** auxiliary circle is used to solve the singularity of the reflex angle at the triangle ***,according to sample statistics,the least squares method is used instead of the Fourier expansion method to solve the undetermined coefficient of the algebraic equations by discrete *** results show that the continuity of the auxiliary boundaries and the accuracy of the zero-stress boundaries are adequate,and the displacement of the free surface and the stress of the circular hole are related to the shape of the triangle,the position of the circular hole,the direction of the incident wave,and the frequency content of the ***,time-domain responses are calculated by FFT based on the frequency domain theory,and the results reveal the wave propagation mechanism in a complicated structure.

关键词： earthquake ground motions theoretical seismology wave scattering and diffraction wave propagation

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Satellite Interference Signal Classification Using Improved MLP Model

Satellite Interference Signal Classification Using Improved ...

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2022 IEEE International Conference on Unmanned Systems, ICUS 2022

作者： Xie, Liwei Zhuang, Yaqiang Zhuang, Xuebin Zeng, Xiaohui School of Systems Science and Engineering Sun Yat-Sen University Guangzhou China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Beijing China Science and Technology On Complex Aviation Systems Simulation Laboratory Beijing China

ISBN: (数字)9781665484565

ISBN: (纸本)9781665484565

In response to the existing style of deceptive jamming of Global Position System (GPS) receivers by aerial jammer carriers, a method using improved multi-layer perceptron (MLP) model is proposed to identify and classify interference sources based on the rate of change of satellite incoming angle. The work firstly constructs an airborne GPS interference source localization deployment model, then analyzes and verifies the rationality of this simulation data model, and finally emphasizes the superiority of the proposed method using the classical classification algorithm as a comparison method. The simulation results indicated that the proposed method is capable to identify the corresponding interferers with a greater rate of recognition compared with other method in the built multi-interference source environment, which provides a reference for dealing with the interference identification and classification in the networked GPS interference source deployment environment. © 2022 IEEE.

关键词： Antennas

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