检索结果-内蒙古大学图书馆

A novel method to increase energy density of permanent magnet machine based on multi-physical field analysis

UPB Scientific Bulletin, Series D: Mechanical Engineering 2020年第4期82卷 79-92页

作者： Zheng, Qingchun Zhao, Yangyang Zhu, Peihao Wang, Sen Liu, Jingna Ma, Wenpeng Li, Xiang Xiao, Yinhong Wang, Naixin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China School of Computer Science Tianjin University of Technology Tianjin300384 China School of Automation Shenyang Institute of Engineering Shenyang110136 China Baoding Power Supply Company Hebei Electric Power Company State Grid Corporation of China Baoding071000 China

As an important component of all-electric aircraft, the main propulsion machine is developing towards high energy density, high efficiency and high fault tolerance. In order to improve the energy density of main propulsion machine for all-electric aircraft, a novel approach, which can be used for excellent performance improvement of electric machine of all-electric aircraft, is reported in this paper. The analytical formula of energy density is put forward and the design method of high energy density permanent magnet machine is presented. A high energy density machine with rated power of 30kW is designed, and the electromagnetic field simulation analysis, strength and stress structure verification, temperature field simulation analysis and multi-physical field coupling analysis are obtained. A prototype is developed, the experiment platform is established, and experiments are performed. The energy density of main propulsion machine designed is up to 21kW·N·m/kg2, and the index is increased by 3.2 times. The optimal method based on the multi-physical field analysis can be also applied to other high energy density machines. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Electromagnetic fields

来源：评论

学校读者我要写书评

暂无评论

Authentication Technology in Industrial control System Based on Identity Password

Authentication Technology in Industrial Control System Based...

引用

第三十九届中国控制会议

作者： Luyao Yang Wenli Shang Chunyu Chen Tianyu Wang Zhoubin Liu Shenyang Institute of Automation Chinese Academy of Sciences School of Information Science and Engineering Northeastern University University of Chinese Academy of Sciences Institute of Robotics and Intelligent Manufacturing Innovation Chinese Academy of Sciences Key Laboratory of Networked Control Systems Chinese Academy of Sciences Electric Power Research Institute State Grid Zhejiang Electric Power Co.Ltd.

Aiming at the current lack of certification capability in domestic industrial control systems, an industrial control system authentication scheme based on identity cryptography algorithm is proposed. When authenticating between control system devices, the scheme integrates the identity-based digital signature algorithm into the SSL/TLS handshake protocol to complete identity authentication between the engineering station and the trusted PLC. At the same time, when the connection is established for the first time between devices, the connection authentication is selected by the challenge/response based method. The authentication technology based on the identity cryptographic algorithm no longer requires the existence of a public key certificate. This eliminates the need to revoke, store, and issue certificates, simplifies the certification process and reduces the amount of computation required by the authentication process. At the same time, the improved handshake protocol is universal in industrial control systems. The authentication technology based on the identity and password algorithm no longer requires the existence of a public key certificate, eliminating the need for certificate revocation, storage, and issuance, simplifying authentication steps, and reducing system maintenance. Finally, by establishing a test environment, the improved handshake protocol is implemented, and the feasibility of the authentication scheme is verified and analyzed.

关键词： Industrial control security digital signature identity authentication SSL/TLS handshake protocol

来源：评论

学校读者我要写书评

暂无评论

Modeling and control of Central Air Conditioning Loads for Peak Shaving

Modeling and Control of Central Air Conditioning Loads for P...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Dingyi Cheng Wen Zhang Meng Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Shandong Electric Power Research Institute Jinan China

Peak shaving can be realized by applying appropriate control on central air conditioning loads due to their large proportion and thermal energy storage characteristics. Simplified model of single central air conditioner is established by analyzing its operating principle. Based on individual model, optimal control model of central air conditioning loads for participating in peak shaving is proposed. Objective is to obtain maximum loads of peak shaving. Constraints take peak shaving and users' comforts into consideration. It should be noted that this optimization model is a mixed integer linear programming and can be solved conveniently. Based on the test platform for central air conditioner, the correctness of individual model can be verified. The effectiveness of optimal control model for peak shaving is verified by simulation results.

关键词： Atmospheric modeling Load modeling Water heating power systems Space heating Central air conditioning

来源：评论

学校读者我要写书评

暂无评论

A hybrid model based on convolutional neural network and long short-term memory for short-term load forecasting

A hybrid model based on convolutional neural network and lon...

引用

IEEE power and Energy Society General Meeting

作者： Jixiang LU Zhihong YANG Qipei ZHANG Mengfu TU Technology Research Center NARI Group Corporation Nanjing China State Key Laboratory of Intelligent Power Grid Protection and Operation Control Nanjing China

To better mine the effective information contained in massive data and improve the accuracy of short-term load forecasting, this paper proposes a hybrid model based on convolutional neural network and long short-term memory network (CNN-LSTM) for short-term load forecasting (STLF), which takes massive historical load data, meteorological data, date information, and peak-valley electric price data as input by constructing continuous feature maps with time sliding window. Convolutional neural network (CNN) is used to extract features and reshape them into vectors. The feature vectors are constructed in temporal and fed into long short-term memory network (LSTM) which is used to predict STLF. To the best of our knowledge, this is the first work to predict STLF using deep learning in both spatial and temporal domains. It is shown that the forecasting accuracy can be notably improved by CNN-LSTM hybrid model method. The effectiveness of the proposed method is validated through extensive comparison studies on a real-world dataset.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Start-up Sequence Optimization of Units and HVDC for Hybrid Multi-Infeed DC Receiving Systems

Start-up Sequence Optimization of Units and HVDC for Hybrid ...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Peng Li Hongtao Wang Dong Yang Huan Ma Kang Zhao Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Shandong Electric Power Research Institute State Grid Jinan China

Aiming at the problem of unit restoration optimization of hybrid multi-infeed direct current (HMIDC) system, an optimization method for start-up sequence of units and HVDC in HMIDC receiving system with LCC-HVDC and VSC-HVDC participation is proposed. Firstly, the interaction between AC and DC systems in the restoration process is analyzed. Then, the multi-objective optimization model of start-up sequence considering HVDC start-up constraints and operational stability constraints is established. And an algorithm based on fast non-dominated sorting genetic algorithm (NSGA-II) for solving the above model is designed. Finally, the feasibility and effectiveness of the proposed method are verified by using IEEE 39 nodes system as an example.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Optimal power Flow Preventive control Considering Wind Farm Access

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期687卷

作者： Fan Chen Zhiqing Liu Jifu Qiu Zhipeng Lu Ming Chen Qingda Niu Xiaoming Dong Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong Province 250061 China State Grid Shandong Electric Power Company Jinan Shandong Province 250001 China Qingdao Electric Power Supply Company of State Grid Shandong Electric Power Company Qingdao Shandong Province 266002 China

Renewable energy access will be an important trend in the development of the future power grid. In order to analyze the uncertainty brought by wind power access and improve the safety of the grid during steady-state operation, this paper models the uncertainty of wind power. An optimal power flow model considering the risk of power and voltage overruns is established. The model takes the optimal cost of power generation as the goal, takes into account the influence of transformer tap adjustment on system network parameters, and the constraint conditions take into account unit power and safety constraints, it is solved by the primal dual interior point method. The effectiveness of the model and algorithm proposed in this paper is verified by the IEEE14 test system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Influencing Factor and Error Analysis of Operating Capacitor Voltage Transformer Harmonic Measurement

引用

Journal of Physics: Conference Series 2021年第1期2121卷

作者： Yan Zhang Huajia Wang Danwen Yu Liu Yang Wenjun Cao Yongxin Yang State Grid Shandong Electric Power Research Institute Jinan 250003 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China State Grid Energy Research Institute Co. Ltd. Beijing 100031 China

With the increasing demands of power quality monitoring and management, the problem of harmonic measurement error caused by the widespread operation of capacitor voltage transformers (CVT) in high-voltage power grids has been unavoidable. This paper analyses the influence of environmental factors on harmonic measurement error of CVT, and proposes a new method for analysing the harmonic measurement errors of operating CVT, which explains the unstable phenomenon of CVT measurement errors based on field comparison test, and provides a progressing screening method of effective analysis data. the CVT harmonic error characteristic analysis method proposed in this paper considers the impact of field installation conditions, electromagnetic environment, and other actual operating environment, which can reflect the actual harmonic error characteristics of CVT in field operation. A CVT harmonic measurement system is established based on the proposed method. The validation and effectiveness of the proposed method is illustrated on a field measurements of 1000kV CVT in Shandong Province.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Optimization of Energy Storage Capacity to Smooth Wind power Fluctuation

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期687卷

作者： Zenggong Cao Chunyi Wang Bo Peng Yasong Wang Peng Du Yinglei Guo Zhen Wei Xiaoming Dong State Grid Shandong Electric Power Company Jinan Shandong Province 250001 China Qingdao Electric Power Supply Company of State Grid Shandong Electric Power Company Qingdao Shandong Province 266002 China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong Province 250061 China

The uncertainty and randomness of wind power generation bring hidden trouble to the safe operation of power distribution network. Combining energy storage system with wind power generation can effectively improve the output characteristics of wind power generation. In this paper, considering the investment cost of energy storage and the effect of suppressing the fluctuation of wind power output, the optimization of energy storage capacity under the scenario of wind power grid connection is studied. Firstly, the multi-objective capacity optimization model of the energy storage system is established to minimize the cost of the energy storage system and the variance of wind power system output equipped with energy storage. Then, the multi-objective optimization problem is transformed into a single objective optimization problem by introducing the weight coefficient of the objective function and the particle swarm optimization algorithm (PSO) is used to solve the problem. Finally, through the test of IEEE-33 bus distribution network system, the relationship curve between energy storage capacity and wind power fluctuation suppression effect is obtained. The results of numerical examples show the effectiveness of the proposed method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Novel Method for Economic Dispatch with Across Neighborhood Search: A Case Study in a Provincial power grid, China

引用

COMPLEXITY 2018年第1期2018卷

作者： Xiong, Guojiang Zhang, Jing Yuan, Xufeng Shi, Dongyuan He, Yu Yao, Yao Chen, Gonggui Guizhou Univ Guizhou Key Lab Intelligent Technol Power Syst Coll Elect Engn Guiyang 550025 Guizhou Peoples R China Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Hubei Peoples R China Guizhou Elect Power Grid Dispatching & Control Ct Guiyang 550002 Guizhou Peoples R China Chongqing Univ Posts & Telecommun Minist Educ Key Lab Network Control & Intelligent Instrument Chongqing 400065 Peoples R China

Economic dispatch (ED) is of cardinal significance for the power system operation. It is mathematically a typical complex nonlinear multivariable strongly coupled optimization problem with equality and inequality constraints, especially considering the valve-point effects. In order to effectively solve the problem, a simple yet very young and efficient population-based algorithm named across neighborhood search (ANS) is implemented in this paper. In ANS, a group of individuals collaboratively navigate through the search space for obtaining the optimal solution by simultaneously searching the neighborhoods of multiple superior solutions. Four benchmark test cases with diverse complexities and characteristics are firstly employed to comprehensively verify the feasibility and effectiveness of ANS. The experimental and comparison results fully demonstrate the superiority of ANS in terms of the final solution quality, convergence speed, robustness, and statistics. In addition, the sensitivities of ANS to variations of population size and across-search degree are studied. Furthermore, ANS is applied to a practical provincial power grid of China. All the comparison results consistently indicate that ANS is highly competitive and can be used as a promising alternative for ED problems.

关键词： Sensitivity analysis

来源：评论

学校读者我要写书评

暂无评论

Load Shedding Model and Algorithm Based on Minimum power Outage Lose

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期687卷

作者： Yasong Wang Zenggong Cao Chunyi Wang Bo Peng Peng Du Yinglei Guo Zhen Wei Xiaoming Dong Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong Province 250061 China State Grid Shandong Electric Power Company Jinan Shandong Province 250001 China Qingdao Electric Power Supply Company of State Grid Shandong Electric Power Company Qingdao Shandong Province 266002 China

This paper combines the power outage loss caused by load shedding with the optimization problem of load shedding during power shortage, and proposes a load shedding model that seeks the minimum power outage loss under the system's security and economic constraints. The model is a kind of optimal power flow. In order to reduce the complexity of solving the model, this paper adopts an improved linear programming algorithm to solve the model. With the help of Jacobian matrix, the objective function and constraints of the system are linearized and the linear optimal solution in the iterative space of control variables can be found. Through multiple iterations the scheme with the minimum power outage loss is obtained that satisfies various constraints while the total power generation cost of the system is minimized The correctness and superiority of the model and algorithm are verified in the IEEE14-bus system.

关键词：

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：