检索结果-内蒙古大学图书馆

2021 China Automation Congress, CAC 2021

作者： Li, Xiongwei Lv, Guanghua Zhu, Runze Li, Gengda Lin, Zhongwei Wang, Wenbin Cui, Qingru China Energy New Energy Technology Reserch Institute Co. Ltd Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control Computer and Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781665426473

To reduce the downtime of wind turbine caused by the fault of pitch system that usually has a high failure rate, a fault early warning method based on long short-term memory (LSTM) neural network is proposed. According to the operation characteristics of the pitch system, monitoring parameters recorded by SCADA, such as wind speed, generator speed, rotor speed, wind direction, pitch angle and output power, are utilized to establish the fault early warning model. Compared with the model based on BP neural network, the prediction accuracy of the LSTM model is effectively improved. The weights and thresholds of the LSTM neural network are optimized, and a reasonable threshold is set to determine the fault early warning criterion for the pitch system. To verify the effectiveness of the proposed method, the LSTM model is applied to the fault early warning for a 1.5MW wind turbine pitch system. The results show that the LSTM model can give early warning about two and a half days before the fault occurs, verifying the feasibility of the proposed method. © 2021 IEEE

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

Investigation of The Anti-icing Performance of Superhydrophobic Silicone Rubber

Investigation of The Anti-icing Performance of Superhydropho...

引用

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

作者： Liu, Shuming Liu, Shuqi Wang, Qian Zuo, Zhou Wang, Tingting Luo, Bing Liang, Xidong Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing100084 China Csg Electric Power Research Institute Co. Ltd. Guangzhou510663 China The Natl. Eng. Res. Ctr. for Ultra High Voltage Eng. Technol. and Innov. Elec. Equipment Foundation China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Composite insulators, as an important part of outdoor transmission lines, always suffer from various environmental stress, and the large-scale icing accretion problem is one of the dangerous threats. In this paper, superhydrophobic silicone rubber was prepared by surface coating method, and its anti-icing performance compared with pristine silicone rubber was investigated. The superhydrophobic surface can repel water droplets so that the droplets can be removed easily before freezing. For the sessile droplets, the freezing speed on the pristine silicone rubber is faster than the process on coated silicone rubber. After completing freezing, the deicing force on pristine silicone rubber is bigger than that on coated silicone rubber. In summary, the superhydrophobic silicone rubber showed more excellent performance in inhibiting ice accretion than the pristine silicone rubber, and it is a potential solution to the icing problem in the power system. © 2022 IEEE.

关键词： Electric power transmission

来源：评论

学校读者我要写书评

暂无评论

Analysis of a hybrid system combining solar-assisted methanol reforming and fuel cell power generation

引用

Energy Conversion and Management 2023年 297卷

作者： Zhao, Ke Kong, Hui Tan, Sicong Yang, Xiao-Guang Zheng, Hongfei Yang, Tao Wang, Hongsheng School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China State Key Laboratory of Power System Operation and Control Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing100084 China Shenzhen Automotive Research Institute Beijing Institute of Technology Guangdong Shenzhen518118 China & Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR Kowloon China

The proton exchange membrane fuel cell (PEMFC) is an efficient and clean power unit that has become a research hotspot for scholars around the world, but the hydrothermal management of the PEMFC limits the cell performance and hinders its large-scale application. In the paper, a hybrid system combining solar-assisted reforming of methanol and fuel cell power generation is proposed, in which methanol is used as a coolant in the hydrothermal management of the PEMFC subsystem to take away the waste heat, and further reformed for hydrogen production with the assistance of the solar energy subsystem to improve the hybrid system efficiency. The study is carried out at both the single cell level and system level to investigate the effect of solar energy on the performance of the hybrid system by simulation results, which are obtained from the finite element software, such as the performance of the PEMFC. The results show that the novel hydrothermal management method using methanol and water in the single cell can control the temperature at 60–80 °C. The highest power density of the single cell reaches 0.595 W/cm2 at a water-to-alcohol ratio of 1:1 and a coolant flow rate of 2.846 mol/s. In addition, the exergy of this hybrid system improves by 76.36% compared to the exergy of the solar thermochemical methanol reforming system at a reaction temperature of 200 °C when the methanol reforming reaction is more complete. The system efficiency can reach up to 59.15%, compared to the solar thermochemical methanol reforming system and the methanol reforming system heated by combustion of methanol, which can only reach 51.10% and 43.18%, respectively. This study provides a novel method for addressing the hydrothermal management issue of PEMFC and a new idea for the efficient utilization of solar energy. © 2023 Elsevier Ltd

关键词： Solar energy

来源：评论

学校读者我要写书评

暂无评论

Dynamic Characteristics of Ion Concentration Distribution for Pulse Combustion with Different Injection Schemes

SSRN

引用

SSRN 2024年

作者： Du, Minglong Liu, Jinxin Ma, Zhuang Song, Jun Li, Jizhen School of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an710049 China Xi’an Modern Control Technology Research Institute Xi’an710065 China Xi’an Modern Chemistry Research Institute Xi’an710065 China

The performance of the aerospace vehicles directly depends on the operation of their large combustion propulsion device. In the development of large combustion propulsion device, combustion instability has long been an inevitable and thorny problem. In this paper, the dynamic characteristics of combustion instability under different injection schemes in a Helmholtz pulse combustor were experimentally investigated. The ion concentration signals in different location of the combustor were acquired to characterize the dynamic process of unsteady combustion with different injection parameters. Results show that the injection schemes with large incident angle and nozzle-hole spacing are not conducive to combustion stability. Large incident angle and nozzle-hole spacing will prevent the fuel jets convergence, thus dividing the central flame front into two parts: one is located near the nozzle outlet with fuel rich combustion and the other is close to the combustor wall with fuel lean combustion. The fuel rich state is easier to stimulate combustion instability than the fuel lean state. Compared to the original converging jet, the newly established fuel rich combustion zone increase the occurrence of combustion instability. On the other hand, the large incident angle and nozzle-hole spacing would cause the combustion heat release to exceed the pressure oscillation, leading to combustion instability. © 2024, The Authors. All rights reserved.

关键词： Combustion

来源：评论

学校读者我要写书评

暂无评论

Research on voltage restoration of island microgrid based on multi-agent fixed-time algorithm

Research on voltage restoration of island microgrid based on...

引用

2021 International Conference on Information Technology and Intelligent control, CITIC 2021

作者： Zhuang, Yan Zhao, Yan Wei, Mofan Liu, Qian Shao, Qianzhi School of Electric Power Shenyang Institute of Engineering Liaoning China Key Laboratory of Regional Multi-Energy System Integration and Control Liaoning Province China Information Center Liaoning China Institution Branch State Grid Liaoning Electric Power Supply Co. Ltd

This paper presents a distributed, robust and fixed-time secondary control for voltage restoration of an islanded microgrid with droop-controlled inverter-based distributed generators (DGs). The network inverter of AC microgrid is set as a multi-agent cooperating system, and voltage recovery can be regarded as a synchronization problem. Different from the existing distributed methods, the method in this paper can ignore the dependence on the initial conditions and the distributed controller based on consensus can restore the voltage magnitude of the island microgrid to the standard reference value in a fixed-time. In order to improve the stability, a fixed-time second-order convergent sliding mode surface is proposed. This method can quickly reach a consensus and has better anti-interference ability and robustness. Finally, the performance of the proposed control strategy is verified. © 2021 institute of Physics Publishing. All rights reserved.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Development and prospect of direct‐current circuit breaker in China

引用

High Voltage 2021年第1期6卷 1-15页

作者： Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu STATE GRID Corporation of China BeijingChina Department of Electrical Engineering Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua UniversityBeijingChina School of Electric and Electronic Engineering Huazhong University of Science&TechnologyWuhanChina School of Electrical Engineering Xi'an Jiaotong UniversityXi'anChina Global Energy Interconnection Research Institute Co. LtdBeijingChina NR Electric Co. LtdNanjingChina

The direct‐current circuit breaker(DCCB)is the most ideal choice for DC fault isolation in DC *** a late start,China's research and development on the DCCB have made outstanding *** article provides a brief glance of current China's DCCB development *** begins by sorting out the technical route according to the topology of *** it systematically summarises both mechanical and hybrid DCCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and *** is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity DC breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,*** article states that the world's first set of hybrid high‐voltage(HV)DCCB,and the first set of mechanical HV DCCB have been *** DCCBs will soon be deployed to the DC grids which have the highest voltage levels therefore require the strongest breaking *** achievements are leading the world in the development and application of *** article also discusses the overall development trends of DCCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,*** discussions serve as references for DCCB's future technological advancement and its ever‐expanding applications.

关键词： breaking breakthrough discussions

来源：评论

学校读者我要写书评

暂无评论

Insulating materials for realising carbon neutrality:Opportunities,remaining issues and challenges

引用

High Voltage 2022年第4期7卷 610-632页

作者： Chuanyang Li Yang Yang Guoqiang Xu Yao Zhou Mengshuo Jia Shaolong Zhong Yu Gao Chanyeop Park Qiang Liu Yalin Wang Shakeel Akram Xiaoliang Zeng Yi Li Fangwei Liang Bin Cui Junpeng Fang Lingling Tang Yulin Zeng Xingtao Hu Jiachen Gao Giovanni Mazzanti Jinliang He Jianxiao Wang Davide Fabiani Gilbert Teyssedre Yang Cao Feipeng Wang Yunlong Zi The State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijingChina Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Simpson Querrey Institute Northwestern UniversityEvanstonIllinoisUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA Department of Information Technology and Electrical Engineering ETH ZürichZürichSwitzerland School of Electrical and Information Engineering Tianjin UniversityTianjinChina Department of Electrical and Computer Engineering Mississippi State UniversityMississippi StateMississippiUSA Electrical and Electronic Engineering The University of ManchesterManchesterUK Department of Electrical Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghaiChina Key Laboratory of Control of Power Transmission and Conversion(SJTU) Ministry of EducationShanghaiChina College of Electrical Engineering Sichuan UniversityChengduChina Shenzhen Institute of Advanced Technology Chinese Academy of Sciences ShenzhenShenzhenChina School of Electrical Engineering Wuhan UniversityWuhanChina School of Integrated Circuits Tsinghua UniversityBeijingChina Jiangsu Jinxin Electric Appliance Co.Ltd. YangzhouChina Tai'an Tiancheng Safety Evaluation Co. Ltd.Tai'anChina Department Electrical Electronic and Information EngineeringUniversity of BolognaBolognaItaly National Engineering Laboratory for Big Data Analysis and Applications Peking UniversityBeijingChina Laplace Paul Sabatier Universityand CNRSToulouseFrance Electrical and Computer Engineering University of ConnecticutStorrsConnecticutUSA State Key Laboratory of Power Transmission Equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)GuangzhouChina De

The 2050 carbon-neutral vision spawns a novel energy structure revolution,and the construction of the future energy structure is based on equipment *** material,as the core of electrical power equipment and electrified transportation asset,faces unprecedented challenges and *** goal of carbon neutral and the urgent need for innovation in electric power equipment and electrification assets are first *** engineering challenges constrained by the insulation system in future electric power equipment/devices and electrified transportation assets are *** materials,including intelligent insulating material,high thermal conductivity insulating material,high energy storage density insulating material,extreme environment resistant insulating material,and environmental-friendly insulating material,are cat-egorised with their scientific issues,opportunities and challenges under the goal of carbon neutrality being *** the context of carbon neutrality,not only improves the understanding of the insulation problems from a macro level,that is,electrical power equipment and electrified transportation asset,but also offers opportunities,remaining issues and challenges from the insulating material *** is hoped that this paper en-visions the challenges regarding design and reliability of insulations in electrical equipment and electric vehicles in the context of policies towards carbon neutrality *** authors also hope that this paper can be helpful in future development and research of novel insulating materials,which promote the realisation of the carbon-neutral vision.

关键词： neutral insulation extreme

来源：评论

学校读者我要写书评

暂无评论

FPGA implementation of hog-based space target distance measurement 2

FPGA implementation of hog-based space target distance measu...

引用

2nd IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Ma, Yue Yi, Jianjun Xu, Gengshu Chen, Yuanhao Wang, Danwei Zhao, Changchun East China University of Science and Technology School of Mechanical and Power Engineering Shanghai200237 China Nanyang Technological University School of Electrical and Electronic Engineering Singapore639798 Singapore Shanghai Aerospace Control Technology Institute Shanghai201109 China Intelligent Unmanned System Control Technology Joint Lab Shanghai201109 China

ISBN: (纸本)9781728190181

This paper focuses on space cooperative target identification and ranging using monocular CMV4000 CMOS sensor and Xilinx Zynq-7000 Soc based platform without the operating system that adopts Histograms of Oriented Gradients (HOG) descriptor and Support Vector Machine (SVM) for classification. With Vivado High-Level Synthesis to accelerate IP creation by enabling C specifications to be directly targeted into devices, this implementation allows for two high-resolution images (2048 times2048 pixels) processing per second. The hardware and software co-design of Xilinx Zynq7000 promises the accuracy of space target classification and distance measurement and thus meets the requirement of real-time space application. © 2021 IEEE.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

Efficient Computer Vision-Based Excavator Bucket Fill Estimation Using Depth Map and Faster R-Cnn

SSRN

引用

SSRN 2023年

作者： Helian, Bobo Huang, Xiaoqian Yang, Meng Bian, Yongming Geimer, Marcus Institute of Mobile Machines Karlsruhe Institute of Technology Karlsruhe76131 Germany State Key Laboratory of Fluid Power and Mechatronic System Zhejiang University Hangzhou310027 China School of Mechanical Engineering Tongji University Shanghai201804 China Shanghai Engineering Research Center for Safety Intelligent Control of Building Machinery Shanghai200032 China

Excavators play an essential role in the construction industry, and the development of autonomous excavator systems is important for increasing productivity and improving worker safety. Accurate estimation of the volume of material in the excavator bucket is a key metric for monitoring and evaluating system automation performance. In this study, a novel solution is proposed that utilizes 2D depth maps as input to a faster region convolutional neural network (Faster R-CNN) model for bucket volume fill estimation. This approach achieves a high estimation accuracy while maintaining a fast real-time processing speed. In addition, a custom loss function is proposed specifically for the classification-regression task of this study to improve the network's generalization despite the data out of distribution. Comparative experiments show that the proposed approach achieves an impressive 96.91% accuracy in fill factor estimation, demonstrating its advantages and promising potential in the practical estimation of automated excavator operations. © 2023, The Authors. All rights reserved.

关键词： Automation

来源：评论

学校读者我要写书评

暂无评论

Research on Transforming Effect and Calculation Method of MMC Converter on AC / DC Harmonics

Research on Transforming Effect and Calculation Method of MM...

引用

2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Cui, Liu Peng, Guangqiang He, Jingsong Wu, Jiyang Mao, Chizu Jiao, Ning Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System GuangZhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid GuangZhou China Maintenance Test Center Ehv Power Transmission Company Guangzhou China Csg Key Laboratory for Dc Transmission Equipment State Evaluation and Fault Diagnosis GuangZhou China Sichuan University College of Electrical Engineering and Information Technology Chengdu China

ISBN: (纸本)9781665414395

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVDC). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and DC systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and DC networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVDC projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and DC sides of MMC converters has not been studied in depth. In this paper, by studying the AC/DC harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/DC harmonics;through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results. © 2021 IEEE.

关键词： Transmissions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：