检索结果-内蒙古大学图书馆

A Method for system Reliability Evaluation Based on Inexact Interval Probability

Journal of Physics: Conference Series 2019年第2期1213卷

作者： Chen Li Li Wang Qiao Yu Meng Li Bolun Wang Yingjian Zhou Zhewen Zhang State Grid Qingdao Power Supply Company Qingdao 266000 Shandong Province China State Grid Jiangsu Electric Power Co. Ltd. Research Institute Nanjing 210000 Jiangsu Province China Key Laboratory of Power System Intelligent Dispatch and control of Ministry of Education (Shandong university) Jinan 250061 Shandong Province China

With a large number of new components and new technologies widely used in power system, the method of power equipment outage probability based on law of large number will no longer be applicable due to the lack of statistical data. This paper considers the high order uncertainty of component failure probability under the condition of small sample size and uses interval values to represent the reliability parameters of the component when carrying out the risk assessment of power system, and propose Belief Universal Generating Function by combining Universal Generating Function with Belief Function Theory. This method can effectively avoid over estimation in interval arithmetic and get a more accurate interval value of power system risk assessment index.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Input data analysis for the thermal rating prediction of the overhead conductor

引用

IOP Conference Series: Earth and Environmental Science 2019年第5期371卷

作者： Li Wenbo Xing Luhua Fu Shanqiang Li Huadong Jiang Zhe Chen Bo Electric Power Research Institute State Grid Shandong Electric Power Company Jinan Shandong Province 250003 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China Jining Power Supply Company State Grid Shandong Electric Power Company Jining Shandong Province 272100 China

The thermal rating of the overhead conductor is closely related to meteorological factors such as wind speed, wind direction, ambient temperature and solar radiation. Therefore, both the historical thermal ratings and meteorological data are alternative input data to predict the thermal rating of the overhead conductor. It is important to select suitable input data to improve the prediction accuracy of the prediction results. Based on the collection of micro-meteorological data from overhead line monitoring system, this paper presents a method to determine the input data for the thermal rating prediction by analysing the autocorrelation of overhead thermal ratings and the cross-correlation between thermal rating and historical micrometeorological data. The results show that the proposed method can provide reference information for the selection of predictive input quantities and prediction time domain.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Unit commitment considering demand response behavior based on utility maximization

Unit commitment considering demand response behavior based o...

引用

2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Zhang, Yumin Han, Xueshan Xu, Bo Zhang, Li Sun, Donglei Miao, Xiaofeng Jiang, Jiayin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Economic and Technology Research Institute of State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Company Yantai Electric Power Company Yantai264001 China

ISBN: (纸本)9781538614273

The active participation of demand side resources in power grid operation not only benefits the individual participant but also benefits the whole system. The optimal goal can promote by excavating the active behaviors of demand side. The welfare maximization of market participant is the driving force of such active behaviors. Considering the independence of each user's behavior, the consumer's utility function is selected to depict consumer's preference and demand response behavior. In order to coordinate the consumers' maximum welfare with social welfare maximization, consumers' utility function and units' operation cost are integrated into Unit Commitment (UC) model. The objective function is to maximize social welfare, by subtracting units' operation cost from consumers' total utility, and this objective can be acquired. Considering the proposed model should be solved in a distributed manner, the idea of the centralized coordination and the decentralized decision-making is proposed. Based on the Lagrangian relaxation (LR) principle and distributed real-time pricing scheme, a closed-loop feedback mechanism is constructed to reflect the relationship among generator output, price level, and load demand. The ten generating units example can illustrate the effectiveness of the proposed method. © 2017 IEEE.

关键词： Power markets

来源：评论

学校读者我要写书评

暂无评论

Rectification analysis on EMC test for an industrial robot 49

Rectification analysis on EMC test for an industrial robot

引用

49th International Symposium on robotics, ISR 2017

作者： Jifang, Lyu Biao, Xiao Jinming, Wan Hui, Wang Gree Electric Appliances Inc.of Zhuhai Zhuhai China State Key Laboratory of Gree Air-conditioning Equipment and System Zhuhai China Guangdong Intelligent Equipment Engineering Technology Research Center Zhuhai China Center for Research and Development of Robot Engineering in Zhuhai Zhuhai China

An industrial robot exceeds the terminal disturbance voltage limit in EMC testing according to the international standard-CISPR 11:2015-06 "Industrial, scientific and medical equipment-Radio-frequency disturbance characteristics-Limits and methods of measurement". By studying the essence of the terminal disturbance voltage test, analyzing the electrical structure and ground grounding system, and identifying the interference type, location and coupling path with near filed probe and spectrum analyzer, the thesis aims at improving the industrial robot's terminal disturbance voltage to meet the standard requirements by three steps. First, analysis to the electrical topology reveals no effective filters and the exceeding frequency band is 150K~8MHz in the testing. Thus three-phase filter is added by the power input line to reduce the interference voltage in the wide frequency band, where append of magnetic toroids or change of hardness achieve no effect. Second, interferences from input/ output lines and around servo motor are found when identifying the interference sources with near filed probe and spectrum analyzer;thus the improving methods are changing the filter location and equipping the filtered power lines away from noise sources to get satisfactory space coupling. Third, the grounding system of the robot is changed and a suitable magnetic toroid is appended to the grounding wires as analysis of the grounding system shows the robot is single-point grounding and the "ground" is filled with common-mode noises. The improvements in the thesis are convenient and quick, and require no inner electric and electronic structure adjustment, which are applicable to same problems of similar robots. © 49th International Symposium on robotics, ISR 2017. All rights reserved.

关键词： Electromagnetic compatibility

来源：评论

学校读者我要写书评

暂无评论

The Development and Analysis of Primary Frequency Regulation and AGC Test in Shandong Power Grid

引用

IOP Conference Series: Earth and Environmental Science 2019年第4期295卷

作者： Qingbin Yu Gang Xin Yongji Cao Yuanyuan Li Qing Yan State Grid Shandong Electric Power Research Institute Jinan Shan Dong 250002 China Shandong Electric Power Dispatch Control Centre Jinan Shan Dong 250002 China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education In Shandong University Jinan Shan Dong 250061 China

Based on the 2018 entire-gird primary frequency regulation and AGC test, the concrete procedures and obtained results of Shandong power grid are analyzed at length. In combination with the published standards and specifications, the new techniques adopted in the test are analyzed. And then, according to the emerging problems during the test, the improvement measures and optimization suggestions are proposed. With the help of analyzed results and proposed advices, the further technical supervision work of source-network coordination can be developed and thermal unit performance can be improved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Distribution system state estimation considering the uncertainty of DG output

Distribution system state estimation considering the uncerta...

引用

2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Liu, Qian Ding, Lei Wang, Xiaohui Gao, Yadong Jin, Fei Wu, Jinyu Liu, Xiaoliang Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China Zhejiang Huayun Electric Power Engineering Design and Consulting Co. Ltd Hangzhou China Weifang Power Supply Company State Grid Shandong Electrical Power Company Weifang China

ISBN: (纸本)9781538614273

The penetration of DGs in modern distribution system brings more uncertainty. GMM (Gaussian Mixture Model) provides an effective way to represent the output distribution of DGs. The current used state estimator is based on WLS method which assumes the error information is Gaussian distributed. To successfully conduct the WLS based state estimation with GMM output, weights information of all the measurements is required. An effective approach to set reasonable weights for the measurements information is proposed in this paper with the purpose to improve the estimation quality with scarce real-time measurements. A simulation is conducted with ukgds-95 system with matlab software to validate the proposed method. © 2017 IEEE.

关键词： state estimation

来源：评论

学校读者我要写书评

暂无评论

Nanodevices: Record‐Low‐Threshold Lasers Based on Atomically Smooth Triangular Nanoplatelet Perovskite (Adv. Funct. Mater. 2/2019)

引用

Advanced Functional Materials 2019年第2期29卷

作者： Guohui Li Tao Che Xingqi Ji Shaoding Liu Yuying Hao Yanxia Cui Shengzhong Liu Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education College of Physics and Optoelectronics Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan 030024 P. R. China State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan 030006 P. R. China Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P. R. China

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of DC micro-grid based on virtual motor control

Modeling and simulation of DC micro-grid based on virtual mo...

引用

2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Yi, Wei Yi, Dawei Hu, Xiongwei Wang, Xiangnv Shi, Fang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China National Joint Engineering Laboratory of Power Grid with Electric Vehicles 17923 Jingshi Road Jinan China State Grid Heilongjiang Power Corporation Harbin Electricity Power Supply Company 188 Shangzhi Road Harbin China

ISBN: (纸本)9781538628942

A flexible DC micro-grid model is proposed, which is suitable for grid-connected renewable energy and energy storage. The complete circuit topology and its corresponding control strategy are given, which can make sure energy reliability, and can automatically achieve a reasonable power distribution. In addition, based on the theory of Virtual Generator (VG), a complete control strategy of each interface is proposed, that is, the Virtual DC Generator (VDG) control strategy is adopted in the load and energy storage unit, and the Virtual Synchronous Generator (VSG) control strategy is adopted in the grid connection interface. VSG has the similar active and reactive power adjustment ability to the synchronous generator. The voltage amplitude and frequency of the grid- connected inverter are adjustable. It can simulate the inertia and damping characteristics of the synchronous generator, and overcome the impact of the traditional grid-connected inverter without inertia to the grid, which can effectively enhance the ability of the grid to accept renewable energy. What's more, the model of electric vehicles is considered into the micro-grid to meet the future trend of power grid. Simulation and experimental results verify the validity and reliability of the proposed. © 2017 IEEE.

关键词： DC-DC converters

来源：评论

学校读者我要写书评

暂无评论

Percussion drilling on nickel-based alloy with thermal barrier coatings using femtosecond laser

引用

Optik 2019年 194卷

作者： Zhaoyang Zhai Wenjun Wang Xuesong Mei Ming Li Xun Li State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong University 99 Yanxiang Road Xi'an Shaanxi 710054 China Shaanxi Key Laboratory of Intelligent Robots Xi'an Jiaotong University 28 West Xianning Road Xi'an Shaanxi 710049 China School of Mechanical Engineering Xi'an Jiaotong University 28 West Xianning Road Xi'an Shaanxi 710049 China Xi’an Institute of Optics and Precision Mechanics 17 Xinxi Road Xi’an Shaanxi 710119 China

Femtosecond laser with wave length of 800 nm was used to perform percussion drilling experiment on nickel-based alloy with thermal barrier coatings (TBCs) in order to eliminate the damages caused by conventional drilling. Analysis of the experimental results indicated that short pulse duration and high peak power characteristics of femtosecond laser led to good processing effect on nickel-based alloy with TBCs. High quality array of holes with the taper of almost zero was generated, for which the inner diameter was 162 μm and the aspect ratio was 15:1. Femtosecond laser processing had little influence on elementary components and phase structure of coating. This study provides feasible technique involving the use of femtosecond laser for machining film cooling hole on nickel-based alloy with TBCs.

关键词： Femtosecond laser Nickel-based alloy Thermal barrier coatings Percussion drilling Film cooling hole

来源：评论

学校读者我要写书评

暂无评论

Study of energy distribution based on basic topological index of power

Study of energy distribution based on basic topological inde...

引用

2017 International Electrical and Energy Conference (CIEEC 2017)

作者： Xiangnv Wang Yujiao Liu Fang Shi The Key Laboratory of power System Intelligent Dispatch and Control of the Ministry of Education(Shandong University) State Grid Shandong Electric Power Company Zaozhuang Branch Company

Transmission capacity is an important indicator to evaluate the reliability of a power *** Characteristic Length Ratio（SCLR） is one of the transmission capacity indexes which combines the complex network theory into the power system and can reflect the transmission *** this paper,take a complex network considering characteristics of power system,an improved topology network model of power system is *** relationship between the network topology index and grid transmission capacity is defined and *** general rules for describing grid transmission capacity are *** correctness and feasibility of the proposed method are proved by simulation.

关键词： Spatial Characteristic Length Ratio（SCLR） topological structure transmission capacity

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：