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Virtually coupled train set control subject to space-time separation:A distributed economic MPC approach with emergency braking configuration

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High-Speed Railway 2024年第3期2卷 143-152页

作者： Xiaolin Luo Tao Tang Le Wang Hongjie Liu State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China Department of Electrical and Computer Engineering University of CaliforniaRiversideCA 92521USA Beijing Zongheng Electro-Mechanical Technology Development Co. Ltd.Beijing 100081China School of Automation and Intelligence Beijing Jiaotong UniversityBeijing 100044China National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong UniversityBeijing 100044China

The emerging virtual coupling technology aims to operate multiple train units in a Virtually Coupled Train Set(VCTS)at a minimal but safe *** guarantee collision avoidance,the safety distance should be calculated using the state-of-the-art space-time separation principle that separates the Emergency Braking(EB)trajectories of two successive units during the whole EB *** this case,the minimal safety distance is usually numerically calculated without an analytic ***,the constrained VCTS control problem is hard to address with space-time separation,which is still a gap in the existing *** solve this problem,we propose a Distributed Economic Model Predictive control(DEMPC)approach with computation efficiency and theoretical ***,to alleviate the computation burden,we transform implicit safety constraints into explicitly linear ones,such that the optimal control problem in DEMPC is a quadratic programming problem that can be solved *** theoretical analysis,sufficient conditions are derived to guarantee the recursive feasibility and stability of DEMPC,employing compatibility constraints,tube techniques and terminal ingredient ***,we extend our approach with globally optimal and distributed online EB configuration methods to shorten the minimal distance among ***,experimental results demonstrate the performance and advantages of the proposed approaches.

关键词： Virtually coupled train set Space-time separation Economic model predictive control Distributed model predictive control Emergency braking configuration

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Bismuth oxide based composite cathode for the intermediate temperature barrier layer free solid oxide fuel cell

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International Journal of Hydrogen Energy 2025年 141卷 13-23页

作者： Xiaoyu Wang Yongliang Zhang Tatsuya Kawada Minfang Han Fuel Cell and Energy Storage Innovation Research Center Department of Energy and Power Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 PR China Graduate School of Environmental Studies Tohoku University Sendai 980-8579 Japan

The high cost and low reliability caused by the high operation temperature hinder the further commercialization of the solid oxide fuel cell (SOFC) at this stage. Thus, lowering the operation temperature and simplifying the structure of the SOFC are both considered to be effective solutions to solve the current issues. Here, the design, fabrication and actual effect of the La 0 · 8 Sr 0 · 2 MnO 3 -(Bi 0 · 75 Y 0.25 ) 0.93 Ce 0 · 07 O 1.5±δ (LSM-BYC) cathode and La 0 · 8 Sr 0 · 2 MnO 3 @(Bi 0 · 75 Y 0.25 ) 0.93 Ce 0 · 07 O 1.5±δ (LSM@BYC) cathode used for the intermediate temperature barrier layer free SOFC are reported. The results showed that tight interfaces between the abovementioned two composite cathodes and the Y 0 · 16 Zr 0 · 84 O 2-δ (YSZ) electrolyte can be formed by sintering at 800 °C. The higher oxygen ion conductivity and oxygen reaction activity of the LSM-BYC cathode and the LSM@BYC cathode, and much simplified structure of the barrier layer free SOFC all contributed to lowering the ohmic resistance and the polarization resistance, making barrier layer free SOFCs used LSM-BYC cathode and LSM@BYC cathode showed better electrochemical performances at intermediate operation temperature 650 °C from low oxygen partial pressure atmosphere to pure oxygen atmosphere, particularly the latter. What is more, the intermediate temperature barrier layer free SOFC used the LSM-BYC cathode showed better operation stability without obvious activation and degradation during the constant electric current generation over one hundred hours. But the deterioration of the interface between the LSM@BYC cathode and the YSZ electrolyte during the operation was likely to cause the sharp decrease of the electrochemical performance, the solutions of which still need further exploration.

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Vibration Characteristics of Slotless Rotating Armature Permanent Magnet Motors

Vibration Characteristics of Slotless Rotating Armature Perm...

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2022 International Conference on electrical Machines, ICEM 2022

作者： Yang, Zhanlu Wang, Shanming Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing100084 China Navy Submarine Academy Qingdao266100 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

For the rotating armature permanent magnet motor (RAPMM), the rotor slot move relating to the stator, which causes the variation of electromagnetic excitation force and the slot-frequency vibration. In order to reduce the slot-frequency vibration of RAPMM, a slotless rotating armature permanent magnet motor (SRAPMM) is proposed and prototyped. The magnetic field, torque, and torque ripple are simulated by finite element method, which shows that the air gap flux density and the radial force keep nearly constant. Vibration experiments were carried out on two SRAPMMs with different magnetic pole widths. The results show that when the motor is no-loaded, the frequency of the main vibration is even times of the current frequency. After the motor is loaded, the amplitude of the electromagnetic vibration is significantly smaller than that caused by mechanical reasons, indicating that the SRAPMM is a good alternative in the application of strict requirements for vibration. © 2022 IEEE.

关键词： Permanent magnets

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Unraveling Plasma Characteristics and Breakdown Mechanism in Nanosecond Pulsed Dielectric Barrier Discharge

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IEEE Transactions on Dielectrics and electrical Insulation 2025年

作者： Li, Mengbo Chen, She Cui, Yingzhe Wang, Qiao Liu, LinLin Zhou, Xuan Zhuang, Chijie Wang, Feng Hunan University College of Electrical and Information Engineering Changsha410082 China Department of Electrical Engineering Tsinghua University Beijing100084 China China Electric Power Planning & Engineering Institute Beijing100120 China School of Electric Power South China University of Technology Guangzhou510641 China State Key Laboratory of Disaster Prevention & Reduction for Power Grid Changsha University of Science & Technology Changsha410114 China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing100084 China

Nanosecond-pulsed dielectric barrier discharges (DBDs) have gained significant attention for its promising applications in various fields. More systematic investigations are necessary to better understand the fundamental processes of pulsed DBD. In this study, the characteristics and the initial breakdown mechanism of atmospheric nanosecond-pulsed DBD are investigated. The Electric Field-Induced Second Harmonic (E-FISH) technique is employed to investigate the electric field within the discharge gap. Additionally, the effects of pulse amplitude and pulse repetition rate on discharge characteristics, particularly the electric field, are analyzed. The results indicate that an increase in pulse amplitude leads to higher breakdown currents and a more pronounced reverse electric field peak, whereas the pulse repetition rate has a minimal effect on discharge behavior. A two-dimensional fluid model is developed to simulate discharge dynamics and analyze the spatiotemporal evolution of particles. Based on both experimental and simulation results, the discharge process is characterized by three distinct stages: Stage I (discharge breakdown), Stage II (surface charge accumulation), and Stage III (surface charge neutralization). The breakdown mechanism is further elucidated by examining the role of residual charges near the dielectric layer, which enhance the local electric field and facilitate the generation of secondary electrons, leading to ionization and subsequent discharge establishment. © 2025 IEEE.

关键词： Dielectric barrier discharge

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Learning-Based Delay Sensitive and Reliable Traffic Adaptation for DC-PLC and 5G Integrated Multi-Mode Heterogeneous Networks

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China Communications 2025年第4期22卷 65-80页

作者： Tian Gexing Wang Ruiqiuyu Pan Chao Zhou Zhenyu Yang Junzhong Zhao Chenkai Chen Bei Yang Sen Shahid Mumtaz State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China State Grid Taizhou Power Supply Company Zhejiang 225300China Department of Engineering Nottingham Trent UniversityNG14FQ NottinghamU.K. Department of Electronic Engineering Kyung Hee UniversityYongin 17104GyeonggiSouth Korea

Low-carbon smart parks achieve selfbalanced carbon emission and absorption through the cooperative scheduling of direct current(DC)-based distributed photovoltaic,energy storage units,and *** current power line communication(DC-PLC)enables real-time data transmission on DC power *** traffic adaptation,DC-PLC can be integrated with other complementary media such as 5G to reduce transmission delay and improve ***,traffic adaptation for DC-PLC and 5G integration still faces the challenges such as coupling between traffic admission control and traffic partition,dimensionality curse,and the ignorance of extreme event *** address these challenges,we propose a deep reinforcement learning(DRL)-based delay sensitive and reliable traffic adaptation algorithm(DSRTA)to minimize the total queuing delay under the constraints of traffic admission control,queuing delay,and extreme events occurrence *** jointly optimizes traffic admission control and traffic partition,and enables learning-based intelligent traffic *** long-term constraints are incorporated into both state and bound of drift-pluspenalty to achieve delay awareness and enforce reliability *** results show that DSRTA has lower queuing delay and more reliable quality of service(QoS)guarantee than other state-of-the-art algorithms.

关键词： DC-PLC and 5G integration multi-mode heterogeneous networks traffic adaptation traffic admission control traffic partition

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Development of GPU-Based Efficient Simulation Module of Wind Farm 7

Development of GPU-Based Efficient Simulation Module of Wind...

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7th IEEE International Conference on power and Renewable Energy, ICPRE 2022

作者： He, Jing Meng, Linghan Zhao, Haoran Li, Bing China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China Shandong University School of Electrical Engineering Jinan China

ISBN: (数字)9781665450638

ISBN: (纸本)9781665450638

The dynamic simulation of the wind farm is important for the construction of a modern renewable energy system. However, for the multi-coupled complex wind farm model, the current wind farm simulation tool is not high efficient enough. Towards this problem, this paper proposed a GPU-based accelerated wind farm simulation module based on ***. It focuses on parallelized optimizing the most time-consuming procedure over the calculation. This paper presents the parallelized algorithms for both the most time-consuming procedures (i.e., the gridded wind speed data traversing procedure and the wake plane traversing procedure). Also, the parallelized program for the two procedures is developed based on CUDA. The developed module is verified using a wind farm with 9 wind turbines in the case study. The result shows that its simulation efficiency is significantly improved compared with ***, whose speedup has reached 237. Also, the calculation accuracy of the proposed module is guaranteed. © 2022 IEEE.

关键词： Wind power

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Environment-friendly Insulating Gases for HVDC Gas-insulated Transmission Lines

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CSEE Journal of power and Energy systems 2021年第3期7卷 510-529页

作者： Geng Chen Youping Tu Cong Wang Jue Wang Zhikang Yuan Guoming Ma Jian Wang Bo Qi Chuanyang Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

Environment-friendly gas insulating mediums adapted to a DC gas-insulated transmission line(GIL)electric field condition is the key to the next generation of Environment-friendly HVDC *** this paper,we review the literature on sulfur hexafluoride(SF6)alternatives including the scientific understanding,control,and implementation of gas-solid systems in this type of power ***,the structure-activity relationship between the molecular structure and physico-chemical properties of Environment-friendly insulating gases is ***,the search and prediction of important physicochemical properties of gases are ***,in view of the potential of environmental friendly insulating gases,the swarm parameters of gas discharge and breakdown properties in a quasi-uniform field,inhomogeneous field,and at the gas-solid interface,that need to be taken into account with industrialized DC GILs are *** latest research progress on insulation characteristics,especially the polarity effect in DC gas-solid insulation systems,the sensitivity to the electrode surface state,and the non-uniformity of the electric field,and the influence of metal particles and their variation with air pressure,is *** addition,the heat transfer characteristics of insulating gases,related to DC GIL transmission with a large current-carrying capacity and the influence of alternative gases on the heat transfer characteristics are ***,aiming at solving the contradiction of low environmental impact,high dielectric strength and low liquefaction temperatures in the selection of alternative gases,an coordinated regulation model for Environment-friendly gases in DC GILs is *** for future work on this topic are also presented.

关键词： Environmental friendly insulating gas gas-insulated transmission line high-voltage direct-current transmis-sion sulfur hexafluoride

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Short Circuit Fault Characteristics of Low Frequency AC Transmission system Based on Modular Multilevel Matrix Converter

Short Circuit Fault Characteristics of Low Frequency AC Tran...

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2023 International Conference on power Energy systems and Applications, ICoPESA 2023

作者： Zhao, Zexin Han, Bin Zhao, Guoliang Xu, Yunfei Lu, Zhengang Xiang, Nianwen Wang, Shulai China Electric Power Research Institute Power System Department Beijing China State Grid Smart Grid Research Institute State Key Laboratory of Advanced Power Transmission Technology Beijing China Hefei University of Technology School of Electrical Engineering and Automation Hefei China

ISBN: (纸本)9798350345605

Compared with power frequency AC transmission and DC transmission, low frequency AC transmission has its unique advantages, which is suitable for long distance transmission, large scale renewable generation and regulation of regional power grid. The fault characteristics affect the system design and operation, which is necessary to study. From the perspective of system topology and converter control, the characteristics of three-phase short circuit fault are analyzed and a simulation model is built on PSCAD for verification in this paper. After a fault occurs, it can be divided into two stages before and after the control responses. Before the control responses, the overvoltage is generated between the terminals of branch reactors and modular capacitors discharges. After the control responses, system characteristics are related to fault location and control strategy. The control and modulation of the converter can make the low frequency and power frequency systems interact with each other. This study can provide a reference for the parameters of equipment and converter control, as well as fault protection in low frequency systems. © 2023 IEEE.

关键词： Timing circuits

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The Influence of Water Permeation on the Chalking of HTV Silicone Rubber Composites

The Influence of Water Permeation on the Chalking of HTV Sil...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Wang, Qian Jiang, Tingyu Liu, Shuming Liu, Shuqi Zuo, Zhou Liang, Xidong Tsinghua University State Key Laboratory of Power System Department of Electrical Engineering Beijing China Qingpu Power Supply Company State Grid Shanghai Electric Power Company Shanghai China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Chalking is a typical aging feature of the widely used silicone rubber based composite insulators, which could seriously damage the surface flashover performance. Based on the operation experience and experimental results, the chalking of silicone rubber is closely related to high temperature and high humidity. However, previous research focuses mainly on the water permeation process at room temperature, in which no obvious chalking phenomenon is identified, leaving the influence of temperature unrevealed. Considering that the evolution of water permeation is very slow in actual conditions, the samples are heated in water bath to accelerate the process in this research. The evolution of weight during the immersion and dehydration is measured, which illustrates that liquid immersion plays the major role in chalking. Also, the composition and microstructure of chalking layers are investigated, indicating that after exposure to severe conditions for sufficient time, samples of different formulas would become chalked in a similar way. © 2022 IEEE.

关键词： Silicone rubber

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Identification and Characterization of the Chalking Layer of High Temperature Vulcanized Silicone Rubber

Identification and Characterization of the Chalking Layer of...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Liu, Shuqi Jiang, Tingyu Wang, Qian Liu, Shuming Zhou, Ying Zuo, Zhou Liang, Xidong Tsinghua University State Key Laboratory of Power System Department of Electrical Engineering Beijing China State Grid Shanghai Electric Power Company Qingpu Power Supply Company Shanghai China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

As the material of sheds and sheaths of composite insulators, high temperature vulcanized (HTV) silicone rubber will face aging phenomenon as the operation time grows. Chalking is usually used as a presentation method of aging, but there are few studies on chalking phenomenon and its influencing factors, which are focused on in this paper. Firstly, the physical and chemical properties of chalking HTV silicone rubber are analyzed from outside to inside, which indicates that the content of C of the chalking sample decreases while O gets higher, and serious oxidation occurs. The main chain and side chain structures are destroyed, while the content of short chain siloxane with low molecule weight (LMW) increases significantly. The chalking layer contains a large amount of small siloxane, while the content of large long chain siloxane is low. This work can provide a useful reference for the performance evaluation, operation and maintenance of composite insulators. © 2022 IEEE.

关键词： Electric insulators

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