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Electronics and Electrical engineering technology (EEET), International Conference on

作者： Mi Liu Junbiao Shi Tao Ma Xiong He Li Wang Mingming Ji Beijing Space Power Conversion and Control Engineering Research Center Beijing Spacecrafts Ltd Beijing

The airborne equipment of civil aviation airliner has high requirements for rapid measurement of voltage transient process, and accurate AC voltage test is required. The common AC voltage RMS measurement method is mainly realized by the voltage transformer cooperating with the true RMS chip. However, if the compensation capacitance of the true RMS chip is larger, the transient overshoot of the power supply output voltage will be too large due to the delay; The capacitance value is small, the collected signal ripple is large, and the accuracy will be affected. In this paper, a method is proposed to quickly measure the amplitude of the angle between the sinusoidal AC two-point voltage and the phase. By sampling different phase amplitudes, the variable speed integration method is used to realize the fast and accurate response of the output voltage. The feasibility and practicability of this innovative principle are verified by the prototype test of design principle.

关键词： Semiconductor device measurement Time-frequency analysis Voltage measurement power measurement power supplies Voltage transformers Capacitance

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research on power Supply control technology Between Multiple spacecraft

Research on Power Supply Control Technology Between Multiple...

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Electrical engineering and control Science (IC2ECS), International Conference on

作者： Xiaomai Meng Xiong He Junbiao Shi Wang Li Liang Ren Mi Liu Beijing Spacecrafts Beijing China Beijing Space Power Conversion and Control Engineering Research Center Beijing China

With the development of Chinese space technology, spacecrafts combination system is constantly established. Solar panels of some spacecraft are blocked due to orbital attitude and space position, which leads to insufficient power generation capacity and difficulty in meeting load requirements. Therefore, the power supply system between multiple spacecraft is established to improve the power utilization rate of each spacecraft and ensure the stable operation of the system. In this paper, an energy supply technology suitable for multiple spacecraft is proposed, which mainly includes high-power isolation and transformation, efficient grid-connected power supply, bidirectional energy control, on-orbit voltage and current regulation.

关键词： space vehicles Analytical models power supplies space technology control systems Topology Solar panels

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Bionic microchannels for step lifting transpiration

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International Journal of Extreme Manufacturing 2023年第2期5卷 244-252页

作者： Zhaolong Wang Qiu Yin Ziheng Zhan Wenhao Li Mingzhu Xie Huigao Duan Ping Cheng Ce Zhang Yongping Chen Zhichao Dong Interdisciplinary Research Center of Low-carbon Technology and Equipment College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082People’s Republic of China MOE Key Laboratory for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 100094People’s Republic of China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhouJiangsu 215009People’s Republic of China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096People’s Republic of China Chinese Academy of Sciences Key Laboratory of Bio-inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of Sciences100190 BeijingPeople’s Republic of China

Those various cross-sectional vessels in trees transfer water to as high as 100 meters,but the traditional fabrication methods limit the manufacturing of those vessels,resulting in the non-availability of those bionic ***,we fabricate those bionic microchannels with various cross-sections by employing projection micro-stereolithography(PμSL)based 3D printing *** circumradius of bionic microchannels(pentagonal,square,triangle,and five-pointed star)can be as small as 100μm with precisely fabricated sharp ***'s more,those bionic microchannels demonstrate marvelous microfluidic performance with strong precursor effects enabled by their sharp *** significantly,those special properties of our bionic microchannels enable them outstanding step lifting performance to transport water to tens of millimeters,though the water can only be transported to at most 20 mm for a single bionic *** mimicked transpiration based on the step lifting of water from bionic microchannels is also *** precisely fabricated,low-cost,various cross-sectional bionic microchannels promise applications as microfluidic chips,long-distance unpowered water transportation,step lifting,mimicked transpiration,and so on.

关键词： bionic microchannel microfluidics water transportation step lifting 3D printing

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Activation methods and underlying performance boosting mechanisms within fuel cell catalyst layer

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eScience 2024年第6期4卷 22-44页

作者： Miao Ma Lixiao Shen Zigang Zhao Pan Guo Jing Liu Bin Xu Ziyu Zhang Yunlong Zhang Lei Zhao Zhenbo Wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Space Power-SourcesSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advance Technology of CeramicsGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education Department of Materials Science and EngineeringHarbin Engineering UniversityHarbin 150001China Unipower Hydrogen Technology(Jiangsu)Corporation No.625Wujin East AvenueWujin DistrictChangzhou 213176China

Proton exchange membrane fuel cells(PEMFCs)have been widely acknowledged as a significant advancement in achieving sustainable energy ***,the activation of newly established Pt-ionomer interfaces in the catalyst layer of PEMFCs can be a time-consuming and costly process to ensure proper coupling and *** order to gain valuable insights into this crucial activation process,we have conducted a comprehensive analysis and comparison of the commonly employed on-line(such as current or voltage control activation,short-circuiting activation,and air interruption activation)and off-line(including boiling or steaming,acidtreatment,and ultrasonic-treatment)activation *** findings shed light on the underlying mechanisms that contribute to enhanced performance within the catalyst layer,such as the reduction of Pt oxides and hydroxides,improved proton transport,and the reduction of“dead”***,this review emphasizes the significant challenges and future opportunities that lie in further enhancing the performance within the catalyst layer through the activation process.

关键词： Activation methods Pt,Pt-alloy,and Pt-free catalysts Pt-ionomer interface Proton exchange membrane fuel cells

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Resource Allocation for Emergency Communications in Distribution Network Satellite Communication System

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China Communications 2025年第2期22卷 95-111页

作者： Xie Haoran Zhan Yafeng Fang Xin Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Space Network and Communications Tsinghua UniversityBeijing 100084China State Grid Jiangsu Electric Power Co. Ltd.Research InstituteNanjing 210000Jiangsu ProvinceChina

Frequent extreme disasters have led to frequent large-scale power outages in recent *** quickly restore power,it is necessary to understand the damage information of the distribution network ***,the public network communication system is easily damaged after disasters,causing the operation center to lose control of the distribution *** this paper,we considered using satellites to transmit the distribution network data and focus on the resource scheduling problem of the satellite emergency communication system for the distribution ***,this paper first formulates the satellite beam-pointing problem and the accesschannel joint resource allocation ***,this paper proposes the Priority-based Beam-pointing and Access-Channel joint optimization algorithm(PBAC),which uses convex optimization theory to solve the satellite beam pointing problem,and adopts the block coordinate descent method,Lagrangian dual method,and a greedy algorithm to solve the access-channel joint resource allocation problem,thereby obtaining the optimal resource scheduling scheme for the satellite ***,this paper conducts comparative experiments with existing methods to verify the effec-tiveness of the proposed *** results show that the total weighted transmitted data of the proposed algorithm is increased by about 19.29∼26.29%compared with other algorithms.

关键词： distribution network emergency communication resource scheduling satellite communication

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research on reliability of multi-channel distributed intelligent distribution architecture 3

Research on reliability of multi-channel distributed intelli...

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3rd International Academic Exchange Conference on Science and technology Innovation, IAECST 2021

作者： Zheng, Sha Liu, Zhen Shi, Junbiao Li, Ly Si, Xueyuan Liu, Wenyang Beijing Spacecraft China Technology Corporation Control Engineering Aerospace Science Beijing Space Power ConversionResearch Center Beijing100094 China

ISBN: (纸本)9781665402675

Aerospace high reliability complex power supply and distribution products are an important part of satellite system, and their reliability is related to the safety of the whole satellite and ship. The traditional task planning and health management take remote control and telemetry as the main means to complete the on orbit operation status monitoring and management of the system by telemetering the characteristic parameters of the power supply and distribution unit. The traditional on-board test equipment and corresponding parameters of the distribution path defined by the hardware connection increase significantly with the expansion of the system. Conventional distribution path design has low margin in technical indicators such as maintainability, scalability and reliability, as well as software definable. This paper decouples the traditional architecture of existing hardware defined distribution path. A variety of different levels of electrical equipment are integrated in a small volume at the same time. In order to avoid permanent damage to the power supply and distribution bus caused the fault of electrical equipment connected to the power network. The fault was removed and avoided to complete the reliability calculation of the architecture. The architecture design ensure the distribution of power for the key loads completed by the core tasks, which has become the forward direction of aerospace reliability under the new development situation. © 2021 IEEE.

关键词： Remote control

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Study on the Matching of Solid State power controller in Cascade Application

Study on the Matching of Solid State Power Controller in Cas...

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Smart power & Internet Energy Systems (SPIES), International Conference on

作者： Huiyao Li Yonggang Chen Zitian Chen Peng Gui Jie Wang Shenyang Wu Beijing Space Power Conversion and Control Engineering Research Center Beijing Spacecrafts Co. Ltd Beijing China North China Institute of Aerospace Engineering Hebei China

In view of the mismatch of the protection characteristics between the SSPC(solid-state power controller)and the cascade application of the fuse in the process of power distribution and use of the spacecraft, this paper analyzes the working principle and protection characteristics of the solid-state power controller. In this paper, the working principle and protection characteristics of the solid state power controller are studied theoretically. The use principle of the space fuse and the breaking characteristics of the parallel application are analyzed. A new method is presented, which combines the inverse time curve key parameter programming of the solid state power controller with the adjustment of the circuit threshold immediately, to solve the flexible matching problem of the protection characteristics when the fuse is cascaded. Finally, the theoretical calculation basis and the principle of safety and reliability evaluation are given, and the feasibility of this method is further verified by experimental verification. It is of great reference significance for the combination of the space distribution management solid state power controller and the fuse.

关键词： space vehicles Satellites Fuses power distribution Process control Aerospace electronics Reliability theory

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Review on recent progress in on-line monitoring technology for atmospheric pollution source emissions in China

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Journal of Environmental Sciences 2023年第1期123卷 367-386页

作者： Huanqin Wang Jitong Zhou Xue Li Qiang Ling Hongyuan Wei Lei Gao Ying He Ming Zhu Xiao Xiao Youjiang Liu Shan Li Chilai Chen Guotao Duan Zhimin Peng Peili Zhou Yufeng Duan Jianbing Wang Tongzhu Yu Yixin Yang Jiguang Wang Zhen Zhou Huaqiao Gui Yanjun Ding State Key Laboratory of Transducer Technology Institute of Intelligent MachinesHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Institute of Mass Spectrometry and Atmospheric Environment Jinan UniversityGuangzhou 510632China Department of Automation University of Science and Technology of ChinaHefei 230027China China Automotive Technology and Research Center Tianjin 300300China Institute of Solid State Physics Chinese Academy of SciencesHefei 230031China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Power Systems Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

Emissions from mobile sources and stationary sources contribute to atmospheric pollution in China,and its components,which include ultrafine particles(UFPs),volatile organic compounds(VOCs),and other reactive gases,such as NH3and NOx,are the most harmful to human *** has released various regulations and standards to address pollution from mobile and stationary ***,it is urgent to develop online monitoring technology for atmospheric pollution source *** study provides an overview of the main progress in mobile and stationary source monitoring technology in China and describes the comprehensive application of some typical instruments in vital areas in recent *** instruments have been applied to monitor emissions from motor vehicles,ships,airports,the chemical industry,and electric power *** only has the level of atmospheric environment monitoring technology and equipment been improving,but relevant regulations and standards have also been constantly ***,the developed instruments can provide scientific assistance for the successful implementation of *** to the potential problem areas in atmospheric pollution in China,some research hotspots and future trends of atmospheric online monitoring technology are ***,more advanced atmospheric online monitoring technology will contribute to a comprehensive understanding of atmospheric pollution and improve environmental monitoring capacity.

关键词： Atmospheric pollution Mobile sources Stationary sources On-line monitoring technology

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A Quasi-Parallel Resonant Switched Capacitor DC-DC Converter with Wide Input Voltage Range Regulation and Enhanced Dynamic Performances

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IEEE Journal of Emerging and Selected Topics in power Electronics 2025年

作者： Qi, Jingjing Wu, Xuezhi Sun, Kai Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Beijing100084 China Beijing Jiaotong University National Active Distribution Network Technology Research Center Beijing100044 China

Wide-range and high-efficiency DC-DC converters are in high demand for various applications, such as distributed systems, electric vehicles, and DC buildings. Resonant switched capacitor converters (ReSCC) can achieve soft switching, have small passive device capacity, and exhibit low voltage stress, but the voltage ratio is difficult to be regulated continuously. In this paper, a quasi-parallel resonant switched capacitor DC-DC converter is proposed to satisfy the design requirements, which incorporates a ReSCC with soft-switching and variable voltage ratio, as well as a Buck converter. In addition, a simplified optimal trajectory controller for ReSCC is investigated, which can be combined with PI controller of Buck converter to enhance the load transient of the proposed converter. Moreover, the input voltage feedforward control is implemented with the optimized feedforward coefficient to suppress the input voltage disturbance. The proposed converter can achieve high efficiency and rapid dynamic response over a wide conversion range. The correctness of the theoretical analyses is verified by a 36V∼60V-5V/20A prototype. © 2013 IEEE.

关键词： Capacitor bank

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research on Current Differential Sampling Accuracy Based on Solid State Electronic Switch

Research on Current Differential Sampling Accuracy Based on ...

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Smart power & Internet Energy Systems (SPIES), International Conference on

作者： Huiyao Li Li Wang Xiaobin Deng Jie Wang Liang Ren Junbiao Shi Beijing Space Power Conversion and Control Engineering Research Center Beijing Spacecrafts Co. Ltd Beijing China Beijing Spacecrafts Co. Ltd Beijing China

Based on the application of the new generation of space-borne solid-state power distribution products, this paper studies the measurement accuracy of current differential sampling technology used by them, and deduces the influence factors of accuracy by analyzing the circuit model of the differential sampling circuit. The effective control measures of accuracy are summarized by analyzing the mechanism of influence factors, which provides theoretical basis for the application of current differential sampling technology and the design of high precision index circuit, and has important reference significance.

关键词： Analytical models Solid modeling power measurement Current measurement Energy power distribution Switches

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