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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Siyuan Liu Kailin He Peihao Yang College of Automation Engineering University of Electronic Science and Technology of China Chengdu China Huaqing College of Xi'an University of Architecture and Technology Xi'an China Xi'an Thermal Power Research Institute Co. Ltd. Xi'an China

In view of the uncertainty of wind turbine generator output and its inability to provide inertial support for the system, the DC side configuration energy storage scheme is adopted, and the virtual synchronous generation (VSG) control strategy is adopted in the inverter on the grid side of wind storage power generation. For the traditional VSG does not have the ability of low voltage ride through (LVRT), the VSG virtual impedance reactive power control link is constructed, The input signal of voltage control is corrected in real time to ensure that the wind power storage system has the ability to support the regional grid voltage transient of the power system. In order to verify the performance of the proposed control strategy, the simulation is carried out through MATLAB/Simulink, and the simulation conditions are set as follows: three-phase ground fault and single-phase ground fault respectively occur in the external transmission line of the air storage system. The simulation results show that the introduction of virtual impedance into the VSG control system can improve the output voltage of the converter on the grid side of wind storage power generation under short circuit conditions, play a role of voltage transient support during LVRT, and make the wind storage VSG control system have voltage support stability, which can provide guidance for practical application.

关键词： Wind energy Wind power generation Power system stability Control systems Inverters Impedance Circuit faults

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Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces

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Case Studies in Thermal engineering 2025年 72卷

作者： Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China

This study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This enhances heat transfer while simultaneously increasing flow resistance. Among different roughness types, cylindrical roughness elements demonstrate a more substantial improvement in both heat transfer efficiency and friction factor compared to cubic elements. The Nusselt number is found to be non-monotonic related to the height of the roughness elements, while the friction factor increases with height. Additionally, larger roughness element diameters lead to higher Nusselt numbers and friction factors. Further analysis reveals that under conditions where the spacing and height remain unchanged, an increase in the roughness elements quantity results in a diminished enhancement of heat transfer. The base edge length of the roughness elements has a more significant impact on heat transfer capacity than the additional heated area, while the additional area primarily affects the flow resistance, causing the friction factor to increase with the number of roughness elements.

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A comprehensive review of electrochemical hybrid power supply systems and intelligent energy managements for unmanned aerial vehicles in public services

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Energy and AI 2022年第3期9卷 148-171页

作者： Caizhi Zhang Yuqi Qiu Jiawei Chen Yuehua Li Zhitao Liu Yang Liu Jiujun Zhang Chan Siew Hwa College of Mechanical and Vehicle Engineering The State Key Laboratory of Mechanical TransmissionsChongqing Automotive Collaborative Innovation CentreChongqing UniversityChongqing400044China College of Automation Chongqing UniversityKey Laboratory of Complex System Safety and ControlMinistry of EducationChongqing UniversityChongqing400044China School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang UniversityHangzhou310027China Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghai 200444China School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang Avenue639798Singapore Sichuan Energy Internet Research Institute Tsinghua UniversityChengdu 610213Sichuan ProvinceChina

The electric unmanned aerial vehicles (UAVs) are rapidly growing due to their abilities to perform some difficult or dangerous tasks as well as many public services including real-time monitoring, wireless coverage, search and rescue, wildlife surveys, and precision agriculture. However, the electrochemical power supply system of UAV is a critical issue in terms of its energy/power densities and lifetime for service endurance. In this paper, the current power supply systems used in UAVs are comprehensively reviewed and analyzed on the existing power configurations and the energy management systems. It is identified that a single type of electrochemical power source is not enough to support a UAV to achieve a long-haul flight;hence, a hybrid power system architecture is necessary. To make use of the advantages of each type of power source to increase the endurance and achieve good performance of the UAVs, the hybrid systems containing two or three types of power sources (fuel cell,battery, solar cell, and supercapacitor,) have to be developed. In this regard, the selection of an appropriate hybrid power structure with the optimized energy management system is critical for the efficient operation of a UAV. It is found that the data-driven models with artificial intelligence (AI) are promising in intelligent energy management. This paper can provide insights and guidelines for future research and development into the design and fabrication of the advanced UAV power systems.

关键词： Unmanned aerial vehicles(UAVs) Power supply system Fuel cell system Artificial intelligence(AI) Energy management systems

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Control Strategy Analysis and Transient Control Characteristics of 5 Mw the Small Modular Supercritical Co2 Brayton-Cycle Reactor System

SSRN

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SSRN 2023年

作者： Ming, Yang Tian, Ruifeng Yang, Wen Zhao, Fulong Yi, Jingwei Fang, Huawei Tan, Sichao College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Nuclear Power Institute of China Chengdu610231 China

The combination of supercritical CO2 (SCO2) Brayton cycle and small modular reactors (SMR) is considered as a promising energy conversion system of nuclear energy. Formulating reasonable system control strategies to cope with different load requirements in actual operation is very important. For supercritical CO2 Brayton cycle which adopts conventional heat sources such as fossil energy and solar energy, valve and bypass control have been proven to be effective load following strategies. However, nuclear safety and thermo-hydraulic constraints will impose more stringent control strategy requirements when the reactor is chosen as the system heat source. Few studies have focused on the operation characteristics of the reactor under different control strategies and the coupling effects of the main equipment. In this paper, a dynamic model of a small modular SCO2 Brayton reactor system with integrated bypass control and inventory control is established. A series of protective control measures are proposed, and the control performance of different control strategies is compared and analyzed. In addition, in order to break through the limitation of single control strategy, a coupling control strategy of inventory and bypass is proposed. The results show that the bypass control strategy will increase the temperature of reactor fuel elements and the system's maximum pressure, and bring a certain degree of thermal shock to the heat exchangers. Inventory control strategy has better reactor safety and higher efficiency, but the control speed is slow. The combined control strategy concentrates on bypass and inventory control advantages and can meet the system loads from 0% up to 100%. The main purpose of this study is to reveal the differences in the dynamic performance of various control strategies, focusing on the thermal hydraulic parameters of the reactor and the performance of the rotating machinery in the transient process, and to provide a basis for the formulation and s

关键词： Carbon dioxide

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Hierarchical Control Scheme for VSC-MTDC System with multiple Renewable Energy Sites Based on Optimal Power Flow and Droop Scheme

Hierarchical Control Scheme for VSC-MTDC System with multipl...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Asif Raza Qi Huang Jian Li Olusola Bamisile Cai Dongsheng Ghalib Raza Sichuan Provincial Key Lab of Power System Wide –Area Measurement and Control School of Mechanical and Electrical Engineering University of Electronic Science & Technology of China College of Nuclear and Automation Engineering Chengdu University of Technology Sichuan Provincial Key Lab of Power System Wide–Area Measurement and Control School of Mechanical and Electrical Engineering University of Electronic Science & Technology of China University of Electronic Science & Technology of China College of Nuclear and Automation Engineering Chengdu University of Technology Sichuan P.R. China Benazir Bhutto Shaheed University of Technology & Skill Development Khairpur Pakistan

This paper designs a hierarchical control system to improve control performance in a multi-terminal high voltage direct current based on the voltage source converter (VSC-MTDC) transmission system. In this control scheme, the primary control layer employs droop control, while the secondary control layer has developed optimal power flow control (OPF) for maintaining the variation of DC voltage and regulating the active power, and simultaneously minimizing power loss. In the event of a power disturbance or a change in power generation or consumption in the DC system, based on OPF results a new stable droop operating mode is established to stabilize DC voltage variation and regulate active power in the network. A ±400 kV four-terminal VSC-MTDC test network has been developed by using PSCAD and MATLAB simulation tools to assess the proposed control scheme. The primary controller is designed in PSCAD, and the secondary optimum control technique is applied in MATLAB. The results of steady-state and transient operating modes demonstrate that the planned control technique can achieve DC voltage regulation and keep active power, and minimize the power losses in the MTDC system.

关键词： Renewable energy sources System integration Control systems Steady-state Power conversion Voltage control PSCAD

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Tobacco Information Extraction Based on UAV High Resolution Images

Tobacco Information Extraction Based on UAV High Resolution ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Kunwei Liao Lei He Yuxia Li Jixian He Jun Gao Fangfang Yan Jinglin Zhang Sichun Jian Hanghui Kang Yufan Yu Liming Lu Rui Qin School of Software Engineering Chengdu University of Information Technology Chengdu China School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Sichuan Guangyuan Tobacco Company Guangyuan China Sichuan Panzhihua Tobacco Company Panzhihua China Sichuan Liangshan Prefecture Tobacco Company Xichang China Chengdu Song Xing Technology Co. Ltd Chengdu China College of Agriculture Sichuan Agricultural University Chengdu China

Tobacco is one of the most important cash crops in China, and accurate acquisition of its planting information is of great significance for tobacco management and yield prediction. In this paper, a tobacco information extraction method based on UAV high-resolution images is proposed. The method uses the RtinaNet target detection model to achieve the identification and localization of tobacco in UAV high-resolution images, and generates tobacco coordinate information. Based on the tobacco coordinates, we designed two algorithms for extracting plant spacing, row spacing and area of tobacco fields, respectively. The experimental results showed that the accuracy of the method reached 98.49%-99.77%, 97.08%-99.98% and 94.48%-99.63% for area, row spacing and plant spacing extracted from the seven experimental tobacco fields, respectively.

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Fuzzy Time-Varying Formation Control for Unmanned Surface Vehicles Considering Aerial Base Station Allocation Algorithm

Fuzzy Time-Varying Formation Control for Unmanned Surface Ve...

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International Conference on Information Science and technology (ICIST)

作者： Qihe Shan Peiyun Ye Fei Teng Tieshan Li Qi Xu Navigation College Dalian Maritime University Dalian China College of Marine Electrical Engineering Dalian Maritime University Dalian China School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Zhejiang Lab Research Institute of Intelligent Networks Hangzhou China

ISBN: (数字)9798350353334

ISBN: (纸本)9798350353341

As an essential maritime relay station, the allocation of a limited number of Aerial Base Stations (ABSs) to meet the communication needs of unmanned surface equipments has emerged a vital issue. This paper investigates the selection of formation centers for time-varying formation control of nonlinear Unmanned Surface Vehicles (USVs) assisted by ABSs. First, considering the Laplacian matrix among the leader ABSs and follower USVs, a communication volume-based and position-dependent algorithm is developed to determine the assigned ABSs for each USV. Next, leveraging fuzzy approximators, a fuzzy time-varying formation control protocol for the USVs is proposed, with the assigned ABS serving as the formation center. Furthermore, based on Lyapunov stability theory, it is demonstrated that all USVs successfully achieve the predefined time-varying formation structure while rotating around the selected ABS. Finally, a numerical simulation is provided to validate the effectiveness of the proposed theoretical results.

关键词： Base stations Information science Protocols Laplace equations Numerical simulation Formation control Resource management Relays Autonomous vehicles Lyapunov methods

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Study of degradation of fuel cell stack based on the collected high-dimensional data and clustering algorithms calculations

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Energy and AI 2022年第4期10卷 29-40页

作者： Tong Niu Weifeng Huang Caizhi Zhang Tao Zeng Jiawei Chen Yu Li Yang Liu College of mechanical and vehicle engineering The State Key Laboratory of Mechanical TransmissionsChongqing Automotive Collaborative Innovation CentreChongqing UniversityChongqing 400044China School of Electrical Engineering Chongqing UniversityChongqing 400044China Propulsion Research Institute of Chongqing Changan New Energy Vehicle Technology Co. LtdChongqingChina School of Automation Chongqing UniversityChongqing 400044China Institute of Sustainable Energy/College of Sciences Shanghai universityShanghai 200444China Sichuan Energy Internet Research Institute Tsinghua UniversityChengduSichuan 610213China Shaoxing Institute of Technology Shanghai UniversityShaoxingZhejiang 312000China

Accurate perception of the performance degradation of fuel cell is very important to detect its health ***,inconsistent operating conditions of fuel cell vehicles in the test result in errors in the *** order to obtain a more credible degradation rate,this study proposes a novel method to classify the experimental data collected under different working conditions into similar operating conditions by using dimensionality reduction and clustering ***,the experimental data collected from fuel cell vehicles belong to high-dimensional *** projecting high-dimensional data into three-dimensional feature vector space via principal component analysis(PCA).The dimension-reduced three-dimensional feature vectors are input into the clustering algorithm,such as K-means and density-based noise application spatial clustering(DBSCAN).According to the clustering results,the fuel cell voltage data with similar operating conditions can be ***,the selected voltage data can be used to precisely represent the true performance degradation of an on-board fuel cell *** results show that the voltage using the K-means algorithm declines the fastest,followed by the DBSCAN algorithm, finally the original data, which indicates that the performance of the fuel cell actually declines faste. Early intervention can prolong its life to the greatest extent.

关键词： Fuel cell vehicle Principal component analysis Clustering algorithms Degradation of fuel cell

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Gas-phase synthesis of Ti_(2)CCl_(2) enables an efficient catalyst for lithiumsulfur batteries

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The Innovation 2024年第1期5卷 33-40页

作者： Maoqiao Xiang Zihan Shen Jie Zheng Miao Song Qiya He Yafeng Yang Jiuyi Zhu Yuqi Geng Fen Yue Qinghua Dong Yu Ge Rui Wang Jiake Wei Weiliang Wang Haiming Huang Huigang Zhang Qingshan Zhu Chuanfang John Zhang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of the Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China China Nuclear Power Engineering Co. Ltd.117 West Third Ring RoadNorth SectionBeijing 100840China College of Materials Science&Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

MXenes have aroused intensive enthusiasm because of their exotic properties and promising ***,to date,they are usually synthesized by etching *** synthetic technologies provides more opportunities for innovation and may extend unexplored ***,we report a bottom-up gas-phase synthesis of Cl-terminated MXene(Ti_(2)CCl_(2)).The gas-phase synthesis endows Ti_(2)CCl_(2) with unique surface chemistry,high phase purity,and excellent metallic conductivity,which can be used to accelerate polysulfide conversion kinetics and dramatically prolong the cyclability of Li-S ***-depth mechanistic analysis deciphers the origin of the formation of Ti_(2)CCl_(2) and offers a paradigm for tuning MXene chemical vapor *** brief,the gas-phase synthesis transforms the synthesis of MXenes and unlocks the hardly achieved potentials of MXenes.

关键词： synthesis phase lithium

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Simulation research on the fluorescence excitation and acquisition of SWNT strain sensor based on the principle of photoluminescence

Simulation research on the fluorescence excitation and acqui...

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Artificial Intelligence, Networking and Information technology (AINIT), International Seminar on

作者： Jie Zhang Fuzhong Zheng Zhonghao Li Yuting Lu Shan Wang Qiang Cao Intelligent manufacturing and automobile school Chongqing college of electronic engineering Chongqing China School of Automation Chengdu University of Information Technology Chengdu China College of mechanical engineering Sichuan university of science and engineering Chengdu China NO.7 Oil Production Plant PetroChina Changqing Oilfield Company Qingyang China

The non-contact strain sensor based on the single-walled carbon nanotube (SWCNT) photoluminescence effect has a great potential that attracted extensive research from both domestic and international scholars. In order to research the non-contact strain sensor, the current paper proposed a fluorescence excitation and acquisition system platform for SWCNT strain sensors, and designed the structures of its optical components. The design, installation, and debugging of this system are conducted. Results show that the fluorescence excitation and acquisition system established in this paper is a suitable platform for SWCNT optical full field strain measurement. Based on this system, the fluorescence excitation and acquisition of the SWCNT film are simulated and analyzed by using OpticStudio software. Simulation results show that the fluorescence intensity is in partial positively correlated with the excitation light intensity, and the light spot diameter could be controlled within 0.1mm. The light spot scanning resolution of the SWNT film achieved the expected effect.

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