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Power Energy systems and Applications (ICoPESA), International Conference on

作者： Yiran Dong Hengchu Shi Dezhi Kong Hao You Jing Chen Shoudong Xu Jinfu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China System Analysis Department Scientific Research Institute of Yunnan Power Grid Kunming China

With the ever-increasing scale of wind power, the fault characteristics of power grids have changed dramatically, and the existing relay setting calculation approaches can no longer meet the requirements of modeling. The wind turbine generator (WTG) is usually treated as constant current source or set to zero to adapt to the traditional short-circuit current calculation software. This method does not consider the fault characteristics of the WTG, so the calculation accuracy is lower than that of iteration. However, the iterative algorithm also has problems, such as non-convergence or too many iterations leading to long computation time. Therefore, a calculation method of short-circuit current considering WTG integrated is proposed in this paper, which can solve the problem of iteration non-convergence while ensuring accuracy within the allowable range of engineering. Firstly, the WTG short-circuit current models considering converter control strategy and fault characteristics are established. Then, the branches with WTG are converted into "constant potential source + equivalent impedance" to facilitate WTG embedding in the relay protection setting calculation software and maintain consistency with the traditional synchronous generator equivalent mode. In addition, the calculation formula of equivalent impedance is deduced, and the modified voltage is also proposed to improve the accuracy. Finally, a simulation is performed in GIRGE B4-39 and part of actual power grids structures in a province to verify engineering practical value of the proposed method.

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Experiments on the vibration of particles levitating in a standing wave acoustic field

Experiments on the vibration of particles levitating in a st...

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2019 International Congress on Ultrasonics, ICU 2019

作者： Dong, Huijuan Wang, Yi Guan, Yingzi Mu, Guanyu Zhao, Jie State Key Laboratory of Robotics and System Harbin Institude of Technology Heilongjiang Harbin150001 China

ISBN: (纸本)9781665407090

Standing wave acoustic levitation and transmission technique has been widely used in many research areas. However, the vibration of particles in an acoustic field restricts their applications. In this work, a kind of mechanism is developed by the authors, in which not only a harmonic linear actuator but also position feedback are used to precisely adjust the distance between the radiator and the reflector with micrometric accuracy. And video computing software is applied to track the motion of the particle. The influence of the factors on the frequencies of the particle both in vertical and horizontal were detailed. Besides, the acceleration field was calculated, which is in good agreement with the model of spring oscillator of an acoustic field. © 2020 Acoustical Society of America.

关键词： Acoustic fields

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Multi-Objective Hybrid Energy Storage Optimization Configuration Model for Reducing Thermal Power Frequency Modulation Loss

Multi-Objective Hybrid Energy Storage Optimization Configura...

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International Conference on Power system technology (POWERCON)

作者： JunHui Li ZhenZhuo Zhao ZhiQiang Zhao HaoJun Liu CuiPing Li Zhi Li CaiQi Jia XingXu Zhu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Grid Hami Power Supply Company Hami City Xinjiang Uygur Autonomous Region China

The TPU (Thermal Power Unit) equipped with HESS (Hybrid Energy Storage system) can effectively increase of FM (Frequency Modulation) performance of the unit and decrease the FM loss of the thermal power unit. The difficulty of rational allocation of ES (Energy Storage) is how to improve the FM performance of TPU and reduce the life cycle cost of ES. Therefore, the paper establishes a multi-objective hybrid energy storage optimization configuration model aimed at reducing the FM loss of thermal power. Firstly, a double-layer control policy of thermal power-hybrid energy storage is proposed. The first layer is the thermal power-hybrid energy storage AGC instruction allocation strategy based on EMD (Empirical Mode Decomposition). The second layer is a hybrid energy storage control strategy with flywheel ES priority action and lithium battery second response. Then, a multi-objective optimal configuration model considering the difference between life cycle cost and benefit and AGC comprehensive evaluation index Kp is established. It uses the multi-objective PSO (Particle Swarm Optimization) algorithm based on TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) to solve the model, which can avoid contingency of traditional multi-objective PSO in determining optimum solution in the Pareto solution set. Finally, based on the simulation analysis of power plant operation data in North China, the results verify the availability and feasibility of the established model.

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Research on Morphological Characteristics of Partial Discharge in Oil-paper Insulation Based on Image

Research on Morphological Characteristics of Partial Dischar...

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Electrical Engineering and Control Technologies (CEECT), Conference on

作者： Luyao Liu Qizhao Zhang Yifan Wang Hongbin Wu Haoxi Cong Hongshun Liu Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment School of Electrical Engineering Shandong University Jinan China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment Shandong University Jinan China

ISBN: (纸本)9781665499002

Oil-paper insulation structure is the main part of the insulation system of oil immersed power transformer, which is prone to partial discharge due to aging, moisture and other factors. In order to study the development process and evolution characteristics of discharge, and explore its influencing factors and mechanism, this paper built an oil-paper insulation discharge test observation platform, obtained discharge images through the high-speed camera, and analyzed the area, perimeter, and displacement changes of streamers during the development of discharge. The results show that the overall trend of streamer area and perimeter is to increase first and then decrease, and rise with the increase of needle plate gap within a certain range. During the discharge process, the streamer basically develops along the axial direction from the needle tip to the paperboard, extending randomly to the left and right sides, with the largest mid-term offset. The thickening of the paperboard will increase the lateral tilt probability of the streamer. The above research results can provide theoretical guidance for the design, manufacture, maintenance and operation of transformers.

关键词： Partial discharges Electrodes Tracking Oils Streaming media Space charge Needles

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Design and analysis of a variable-span and cambered span morphing wing for UAV

Design and analysis of a variable-span and cambered span mor...

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2019 IEEE International Conference on robotics and Biomimetics, ROBIO 2019

作者： Yang, Guang Guo, Hongwei Liu, Rongqiang Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin Heilongjiang Province China

ISBN: (纸本)9781728163215

The variable-span and cambered span morphing wing for unmanned aerial vehicle (UAV) can greatly improve its flight efficiency. In this work, a new extendable and bendable morphing wing with double driving is designed. The morphing skeleton of wing is composed of the basic unit module which is seven-bar mechanism in series. The rubber-filled corrugated sandwich corrugated skin is designed according to the requirement of morphing skeleton. The kinematics model of morphing skeleton that is composed of three modules in series is established, then the kinematics analysis of morphing skeleton is carried out, at last the expressions of the deformed position and driving angle are obtained. In the case of the same wing span, the influence of different rod length ratio on the maximum extension length of the morphing wing is analyzed, and the influence of different driving speed on the maximum bending angle under the same rod length ratio is compared and analyzed. © 2019 IEEE.

关键词： Wings

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Partial Discharge Detection of Ozone Gas and Ultraviolet Fusion Based on Barium Titanate (001) Monolayer

SSRN

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SSRN 2023年

作者： Zhang, Xiaobo Wang, Ping Qiao, Hao Li, Wen Sun, Hao Tao, Lu-Qi The Beijing Engineering Research Center of Industrial Spectrum Imaging School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing100083 China The State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400044 China

Partial discharges in the air are often accompanied by the generation of ozone (O3) and ultraviolet radiation. This study explores the potential of barium titanate (BaTiO3) monolayer for detecting such partial discharges. The investigation focuses on evaluating the BaTiO3 monolayer's sensitivity to the ultraviolet generated during discharge and its selective adsorption capability for O3 gas. And the feasibility of BaTiO3 monolayer for partial discharge detection in the air is verified through density functional theory (DFT) calculations. The computational results demonstrate that the BaTiO3 monolayer effectively filters out visible light and exhibits a significant optical response to wavelengths below 400 nm. Moreover, the BaTiO3 monolayer excludes the influence of major gas components in the air and exhibits excellent selective adsorption towards O3 gas. Furthermore, both O3 gas and the major components in the air are physically adsorbed, resulting in minimal impact on the structural integrity of the BaTiO3 monolayer, making it suitable for long-term partial discharge monitoring in the air environment. © 2023, The Authors. All rights reserved.

关键词： Monolayers

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Face preference detection task based on EEG energy analysis in the source domain

Face preference detection task based on EEG energy analysis ...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Pengchao Wang Junkongshuai Wang Lu Wang Wei Mu Gege Zhan Xueze Zhang Lan Niu Jianxiong Bin Zhiyan Dong Lihua Zhang Jie Jia Zhongxue Gan Xiaoyang Kang MOE Frontiers Center for Brain Science State Key Laboratory of Medical Neurobiology Laboratory for Neural Interface and Brain Computer Interface Engineering Research Center of AI & Robotics Ministry of Education Shanghai Engineering Research Center of AI & Robotics Institute of AI and Robotics Academy for Engineering & Technology Fudan University Shanghai China Ji Hua Laboratory Foshan China Department of Rehabilitation Medicine Huashan Hospital Fudan University Shanghai China Yiwu Research Institute of Fudan University Yiwu City China Research Center for Intelligent Sensing Zhejiang Lab Hangzhou China

Facial stimulation can produce specific event-related potential (ERP) component N170 in the fusiform gyrus region. However, the role of the fusiform gyrus region in facial preference tasks is not clear at present, and the current research of facial preference analysis based on EEG signals is mostly carried out in the scalp domain. This paper explores whether the region of the fusiform gyrus is involved in processing face preference emotions in terms of the distribution of energy over the source domain, and finds that the pars orbitalis cortex is most energetically active in the face preference task and that there are significant differences between the left and right *** Relevance— The role of pars orbitalis in facial preference may help doctors determine whether the pars orbitalis cortex is lost in clinical practice.

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Nuciferine analogs block voltage-gated sodium, calcium and potassium channels to regulate the action potential and treat arrhythmia

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Biomedicine and Pharmacotherapy 2024年 179卷 117422-117422页

作者： Zhou, Ying Xun Wang, Wen Ping Ke, Jin Ou, Hui Ping Chen, Lin Yun Hou, An Guo Li, Peng Ma, Yun Shu Bin Jin, Wen Key Laboratory of External Drug Delivery System and Preparation Technology in Universities of Yunnan and Faculty of Chinese Materia Medica Yunnan University of Chinese Medicine Yunnan Kunming China School of Food and Drug Shenzhen Polytechnic University Guangdong Shenzhen China State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

Dysfunction of the Nav1.5, Cav1.2, and Kv channels could interfere with the AP and result in arrhythmias and even heart failure. We herein present a novel library of nuciferine analogs that target ion channels for the treatment of arrhythmias. Patch clamp measurements of ventricular myocytes revealed that 6a dramatically blocked both the I_Na and I_Ca without altering the current–voltage relationship (including the activation potential and peak potential), accelerated the inactivation of Nav and Cav channels and delayed the resurrection of these channels after inactivation. Additionally, 6a significantly decreased the APA and RMP without affecting the APD30 or APD50. The IC₅₀ values of 6a against Nav1.5 and Cav1.2 were 4.98 μM and 4.62 μM, respectively. Furthermore, 6a (10 μM) blocked I_Ks, I_K1, and I_to with values of 17.01 %±2.54 %, 9.09 %±2.78 %, and 11.15 %±3.52 %, respectively. Surprisingly, 6a weakly inhibited hERG channels, suggesting a low risk of proarrhythmia. The cytotoxicity evaluation of 6a with the H9c2 cell line indicated that this compound was noncytotoxic. In vivo studies suggested that these novel nuciferine analogs could shorten the time of arrhythmia continuum induced by BaCl₂ and normalize the HR, QRS, QT and QTc interval and the R wave amplitude. Moreover, 6a dose-dependently affected aconitine-induced arrhythmias and notably improved the cumulative dosage of aconitine required to evoke VP, VT, VF and CA in rats with aconitine-induced arrhythmia. In conclusion, nuciferine analogs could be promising ion channel blockers that could be further developed into antiarrhythmic agents. © 2024 The Authors

关键词： Antiarrhythmic agents Cav1.2 Kv channels Nav1.5 Nuciferine analogues

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Bottom-Up Nucleation Induced Conformal Crystallization For Inverted Ma-Free Perovskite Solar Cells on Textured Substrates

SSRN

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SSRN 2024年

作者： Liu, Ruochen Xu, Jiawei Hu, Tianxiang Li, Xiang Wang, Kongxiang Huang, Qi Duan, Zhongtao Liu, Hong Qian, Weifan Zhou, Haiting Cong, Chunxiao Yue, Xiaofei Zhang, Hong Xie, Fengxian Institute for Electric Light Sources School of Information Science and Technology Fudan University Shanghai200438 China Department of Materials Science National Engineering Lab for TFT-LCD Materials and Technologies Fudan University Shanghai200433 China Center for Micro Nano Systems School of Information Science and Technology Fudan University Shanghai200438 China State Key Laboratory of ASIC & System School of Information Science and Technology Fudan University Shanghai200438 China State Key Laboratory of Photovoltaic Science and Technology Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of Optoelectronics Fudan University Shanghai200438 China

Utilizing textured fluorine-doped tin oxides (FTO) as transparent conductive oxide (TCO) substrates is advantageous for capturing incident light, thereby enhancing the power photoelectric conversion efficiency (PCE) of inverted perovskite solar cells (PSCs). However, the roughness of these substrates and uncontrolled nucleation often results in voids at the perovskite-buried surface, leading to insufficient charge extraction and serving as degradation initiation points. This study introduces (S)-3-amino-4-(4-chlorophenyl)butyric acid hydrochloride (AbaCl), which binds to FTO through its anchor group (–COOH) at the deficient regions of MeO-4PACz. Moreover, the chlorine end molecules offer active sites for nucleation by forming halogen bonds with undercoordinated iodide ions (I–). AbaCl also interacts with formamidinium (FA+) in perovskite precursor solution via hydrogen bonding, promoting crystallization at the buried interface. Consequently, nucleation at this buried interface becomes preferential, ensuring bottom-up growth and preventing voids formation due to incomplete solvent evaporation, allowing the perovskite layer to conformally adhere to the substrate without gaps. As a result, the AbaCl-treated inverted PSCs achieved a champion PCE of 24.5% and exhibited enhanced operational stability. This work presents a method for conformally growing perovskite films on textured substrates to produce efficient and stable PSCs. © 2024, The Authors. All rights reserved.

关键词： Hydrogen bonds

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key technologies and applications of intelligent dispatching command for high-speed railway in China

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Railway Sciences 2023年第3期2卷 336-346页

作者： Shuxin Ding Tao Zhang Kai Sheng Yuanyuan Chen Zhiming Yuan Signal and Communication Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina Traffic Management Laboratory for High-Speed Railway National Engineering Research Center of System Technology for High-Speed Railway and Urban Rail TransitBeijingChina State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijingChina

Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)*** the core of HSR transportation command,the intelligent CTC system is a new HSR dispatching command system that integrates the widely used CTC in China with the practical service requirements of intelligent *** paper aims to propose key technologies and applications for intelligent dispatching command in HSR in ***/methodology/approach–This paper first briefly introduces the functions and configuration of the intelligent CTC *** new servers,terminals and interfaces are introduced,which are plan adjustment server/terminal,interface for automatic train operation(ATO),interface for Dynamic Monitoring system of Train Control Equipment(DMS),interface for Power Supervisory Control and Data Acquisition(PSCADA),interface for Disaster Monitoring,***–The key technologies applied in the intelligent CTC system include automatic adjustment of train operation plans,safety control of train routes and commands,traffic information data platform,integrated simulation of traffic dispatching and ATO *** technologies have been applied in the Beijing-Zhangjiakou HSR,which commenced operations at the end of *** these key intelligent functions has improved the train dispatching command capacity,ensured the safe operation of intelligent HSR,reduced the labor intensity of dispatching operators and enhanced the intelligence level of China’s dispatching ***/value–This paper provides further challenges and research directions for the intelligent dispatching command of *** achieve the objectives,new measures need to be conducted,including the development of advanced technologies for intelligent dispatching command,coping with new requirements with the development of China’s railway signaling system,the integration of traffic dispatching and train control and the application of

关键词： High-speed railway Intelligent dispatching command Intelligent centralized traffic control key technologies and application

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