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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Wenxuan Tong Zhengang Lu Minxiao Han Guoliang Zhao Jufeng Li Fangyang Chai School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China North China University of Technology Beijing Engineering Research Center of Frequency Conversion Technology Beijing China

Hybrid Power Station (HPS) will be one of the primary forms of the future power station to construct a safe and stable renewable power system. Due to the uneven regional spread of renewable energy resources, large-scale centralized development will become essential for renewable energy utilization. In this study, we investigate the optimal siting of HPS from the perspective of network loss optimization. First, we establish the basic model of network loss and propose this study's three basic assumptions through a three-bus radial network case study. Subsequently, to solve the optimal siting problem of centralized HPS, we propose a centralized HPS siting optimization method (CAM) and give a detailed application flowchart. Finally, we build an IEEE 14-bus model based on the MATLAB/Simulink platform to simulate and validate the CAM method and visualize the simulation data based on the IEEE 14-bus schematic, and the results obtained verify the effectiveness of the CAM method.

关键词： Electrical engineering Renewable energy sources Flowcharts Optimization methods Mathematical models Data models Hybrid power systems

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Effect of ZnO Catalyst on the Degradation of SF6 by DBD Plasma

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Li, Yalong Tan, Huiyu Gao, Peng Zhang, Xiaoxing Wang, Dibo Fu, Mingli Zhuo, Ran Yu, Lei Liu, Wei Hubei University of Technology Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Wuhan430068 China CSG Electric Power Research Institute Co. Ltd Guangzhou510663 China State Grid Anhui Electric Power Company Electric Power Research Institute Hefei230022 China

Sulfur hexafluoride (SF6) is widely used in gas-insulated equipment due to its excellent electrical properties. However, SF6 is a potent greenhouse gas, and with the implementation of the "dual carbon" strategy, reducing SF6 emissions has become imperative. This paper analyzes the interaction between SF6 and the ZnO surface through simulation calculations and studies the effects of ZnO-filled systems on SF6 degradation by DBD through experiments. The results demonstrate that the charge transfer of individual fluorine atoms is relatively weak, with no significant charge transfer occurring before and after the adsorption of each fluorine atom. Furthermore, after adsorption on the ZnO surface, the SF6 molecule does not undergo noticeable deformation, indicating that the adsorption of SF6 on the ZnO surface is physical adsorption. Under the conditions of a 2% SF6 concentration, a gas flow rate of 150 mL/min, and an input power of 90 W, the SF6 degradation rate and equivalent capacitance with ZnO filling were found to be 96.6% and 79.31 pF, respectively. At an input power of 80W, the energy yield reached a maximum value of 12.41 g/kWh, and the main decomposition products of SF6 were SO2, SO2F2, and SOF2. This study provides a theoretical basis for the efficient degradation and harmless treatment of SF6 © 1994-2012 IEEE.

关键词： Adsorption

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A chlorinated lactone polymer donor featuring high performance and low cost

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Journal of Semiconductors 2022年第5期43卷 15-31页

作者： Ke Jin Zongliang Ou Lixiu Zhang Yongbo Yuan Zuo Xiao Qiuling Song Chenyi Yi Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China College of Materials Science&Engineering Huaqiao UniversityXiamen 361021China State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China School of Physics and Electronics Central South UniversityChangsha 410083China

The development of low-bandgap nonfullerene acceptors and wide-bandgap polymer donors speeds up the advance of organic solar cells(OSCs)[1-17]. Wide-bandgap copolymers based on fused-ring acceptor units are ideal donor materials due to their low-lying HOMO levels, high hole mobilities and complementary light absorption to nonfullerene acceptors[18-25]. Currently, high-performance donors with 18%power conversion efficiencies(PCEs) belong to this type.

关键词： donor polymer performance

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Adaptive Cruise Control of Virtual Coupled High-Speed Trains

Adaptive Cruise Control of Virtual Coupled High-Speed Trains

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2021 China Automation Congress, CAC 2021

作者： Wang, Di Cao, Yuan Su, Shuai State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University The Center of National Railway Intelligent Transportation System Engineering and Technology China Academy of Railway Sciences Beijing China School of Electric and Information Engineering Beijing Jiaotong University Beijing China Frontiers Science Center for Smart High-speed Railway System State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

ISBN: (纸本)9781665426473

The adaptive cruise formation control problem for multiple high-speed trains (MHSTs) with input, speed and minimum tracking distance constraints under virtual coupling (VC) is proposed in this paper. First, the dynamic equation of MHSTs is created based on the law of kinematics. The communication topology is modeled by graph theory. Next, the speed limit, minimum tracking distance with adjacent trains are dealt with by using the ideas of the potential function. The resistance and unknown disturbances are dealt with by using adaptive control. Then, a cruise control protocol for MHSTs to track the expected trajectory is designed. The Lyapunov theory is used to prove the system stability. Finally, numerical experiments are conducted, which illustrates that the control protocol is effective. © 2021 IEEE

关键词： Graph theory

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Peak and Valley Periods Partitioning Based on Improved K-medoids Algorithm

Peak and Valley Periods Partitioning Based on Improved K-med...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Huang, Wei Peng, Lvbin Sun, Yue Yan, Jiahao Sun, Kaibin Li, Xuan Cheng, Xin Hu, Bo Xie, Kaigui State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728191645

The time of use (TOU) electricity pricing is one of the electric demand response (DR) strategies and has been widely used in the electrical power systems. The reasonable partitioning of peak, flat and valley periods is the prerequisite for setting the price of TOU. This paper proposes a peak-flat-valley (PFV) period partitioning model based on improved K-medoids algorithm. To address the instability problem of the divided periods caused by the random selection of initial centers in conventional clustering methods like k-means algorithm, the proposed model employs the maximum distance method to determine the initial center of each period. Then, the variation range for the center of each period can be obtained by the continuous nearest neighbor searching (CNNS) strategy, while improving the computation efficiency. A new criterion of partitioning is established based on Hausdorff distance and Euclidean distance, which is used in the particle swarm optimization (PSO) to optimize the period partitioning. Finally, case studies on IEEE reliability test system (RTS) demonstrate the effectiveness of the proposed model. © 2020 IEEE.

关键词： K-means clustering

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Mechanical Fault Diagnosis of Transformer On-Load Tap-Changer Based on Improved Variational Mode Decomposition and Support Vector Machine 7

Mechanical Fault Diagnosis of Transformer On-Load Tap-Change...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Gu, Hongrui Wang, Youyuan Li, Bonan Chen, Yingyu Li, Zhihe State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728155111

Transformer on-load tap-changer (OLTC) is a key component of transformer. Vibration detection method can be applied to the mechanical condition monitoring and fault diagnosis owning to its non-invasive and high-sensitive property. However, several problems such as modal aliasing and feature one-sidedness exist in the current signal processing and fault diagnosis method for OLTC vibration signal. In the paper, an OLTC simulation experiment platform and a vibration signal sensor system are built, and three typical defects, including spring elasticity change, contact wear and contact looseness are set. The vibration signals collected by accelerometers are decomposed into a series of modal components with narrow band and distinguishing center frequency by improved variational mode decomposition (VMD). Then the features including energy, permutation entropy and singular values of each modal component are extracted, and Laplacian-score is used to select the features with better discriminative ability. Finally, the support vector machine (SVM) optimized by genetic algorithm (GA) is applied to fault diagnosis. The result shows that the proposed feature extraction method provides comprehensive and distinguishing features in each operation state, and the proposed fault diagnosis method has higher identification accuracy compared with conventional method. © 2020 IEEE.

关键词： Variational mode decomposition

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Microstructural Evolution and Hardening of Ti-Based Hcp Medium-Entropy Alloy Coating Via Annealing Treatment

SSRN

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SSRN 2023年

作者： Wang, Zhaoqin Shi, Yu Wang, Xiaorong State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Mechatronic Engineering Lanzhou Jiaotong University Lanzhou730010 China Key Laboratory of System Dynamics and Reliability of Rail Transport Equipment of Gansu Province Lanzhou Jiaotong University Lanzhou730010 China

The Ti-Nb-Zr-Al-Cr Ti-based medium-entropy alloy coatings were prepared using plasma cladding, and the heat treatments were carried out via 400°C/10h, 800°C/10h and 1200°C/10h high temperature annealing. The original coating and the annealed coatings are comprised of single HCP solid solution. Due to high temperature microstructure evolution, heat treatment changes the microhardness of the coatings significantly. The 800°C/10h annealed coating has the highest microhardness, which is 27.1% higher than that of the TC11 titanium alloy substrate. © 2023, The Authors. All rights reserved.

关键词： Entropy

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A novel gait prediction method for soft exosuit base on limit cycle and neural network 22

A novel gait prediction method for soft exosuit base on limi...

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22nd IEEE International Conference on E-Health Networking, Application and Services, HEALTHCOM 2020

作者： Chen, Lingxing Chen, Chunjie Fang, Tao Zhang, Yu Liu, Youfu Wu, Xinyu Shenzhen Institutes of Adanced Technology Chinese Academy of Sciences Shenzhen China ShenZhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen China Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Shenzhen China Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen China

ISBN: (纸本)9781728162676

The important purpose of soft exosuit is to decrease the energy consumption of users by providing assistance. If there is something wrong with the judgment of the human gait during the assisting process, the assisting effect will be poor and even people's walking will be affected. A novel method is designed to predict human gait information in the paper, which utilizes the curve shape and mathematical characteristics of the Rayleigh oscillator equation in limit cycle to fit gait information. Only 1/4 gait cycle data is needed to input into the trained neural network to output an Rayleigh oscillator equation that can better predict the remaining gait cycle information. Data of four subjects on different terrains which include flat ground and upstairs are collected. Experiment results showed that the trained ANN model costs about 0.006s in CPU, it has a prediction speed similar to traditional prediction methods. Simultaneously the Rayleigh oscillator equation has good performance in predicting gait information, and it can show a higher stability and accuracy compared with traditional gait prediction methods. © 2021 IEEE.

关键词： Forecasting

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The Study of Limit Load and Plastic Collapse Load Under Combined Loads

The Study of Limit Load and Plastic Collapse Load Under Comb...

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作者： Zhang, Ying Zheng, Bin Zhang, Liping Liu, Zhenyu Du, Juan State Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu610213 China

In the process of mechanical analysis for equipment and pipe of reactor coolant system (RCS), due to the severe load condition, the stress analysis cannot satisfy the evaluation criteria at times, the limit analysis and plastic analysis is necessary. This paper focus on the limit load and the plastic collapse load of the straight pipe and three-way pipe of reactor coolant system (such as the nozzle of main equipment and the pipe of main system) under combined loads, the analytical method and the finite element (FE) method are adopted in this paper. Get the limit load curve and the plastic collapse load curve of straight pipe and three-way pipe under combined loads, the effect of load history and structure size is analyzed. Tangent intersection criterion (TI) and Plastic work-tangent criterion (PWT) are adopted to study the plastic collapse load curve of straight pipe under combined load of pressure and bending moment. Get the theoretical equation of the limit load and plastic collapse curve of straight pipe under combined loads;get the theoretical equation of the limit load surface of straight pipe under combined load of pressure, bending moment and torque. The effect of many factors is analyzed on three-way pipe. © Springer Nature Switzerland AG 2020.

关键词： Stress analysis

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A 33-37GHz Two-Path Power Amplifier with>18-dB Gain and 26.7-dBm Psat in 150nm GaAs Process

A 33-37GHz Two-Path Power Amplifier with>18-dB Gain and 26.7...

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Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PrimeAsia)

作者： Zhonghao Sun Zhili Liu Tianxiang Wu Hao Yu Yong Chen Shunli Ma State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China School of Microelectronics Southern University of Science and Technology Shenzhen China State-Key Laboratory of Analog and Mixed-Signal VLSI and IME/ECE-FST University of Macau Macao China

This paper presents a GaAs power amplifier (PA). Through the theoretical analysis of the small-signal modeling and large-signal analysis of GaAs transistors, the main influencing factors affecting the saturated output power and gain of a single Gaas transistor are achieved. We develop a low-loss broadband matching by using T-type matching network technology. In addition, the input matching network and the output matching network are used to realize power distribution, which solves the problems of large area and high insertion loss of the traditional power divider in GaasPA. The designed PA is based on a 0.15um GaAs process. The simulation results show that our GaasPA can achieve a saturated output power of 26.7 dBm and a gain of 18 dB in the range of 33-to-37GHz, the DC power consumption is 214 mA at a supply of 5 V, and the chip area is $1.0 \ \mathbf{mm} \ \times \ 1.45 \ \mathbf{mm}$ ,

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