检索结果-内蒙古大学图书馆

2019 4th Asia Conference on Power and Electrical engineering, ACPEE 2019

作者： Sun, Shuqin Li, Yongbin Xu, Zhengqing Li, Mingjia Wang, Can College of Instrumentation and Electrical Engineering Jilin University Lab. of Geo-Exploration and the Instrumentation Ministry of Education of China Changchun130026 China Beijing Kedong Electric Power Control System Co.Ltd Beijing100192 China

At present, China's power system is developing in the direction of AC-DC parallel connection. AC-DC hybrid transmission has become the inevitable pattern of China's future power grid. In the operation of AC/DC hybrid system, the optimization of multiple indexes is often considered. One of the economic problems of system operation is how to minimize the operation cost of the system. This requires the optimal solution of a system of nonlinear equations with constraints. Among the existing algorithms, the interior point method has excellent convergence performance and has been widely used in power system. In this paper, the basic principle of interior point method is introduced, and the interior point method is used to optimize the AC and DC power flow obtained. With the network operation cost as the objective optimization index. The Matlab software is used for programming and simulation calculation. On the basis of verifying the effectiveness of the algorithm, the algorithm is transplanted into the large network for calculation and analysis, and the adaptability of the test algorithm. © Published under licence by IOP Publishing Ltd.

关键词： Electric load flow

来源：评论

学校读者我要写书评

暂无评论

Arbitrarily shaped retro-reflector by optics surface transformation

引用

Chinese Optics Letters 2020年第10期18卷 58-62页

作者： Fei Sun Yichao Liu Yibiao Yang Zhihui Chen Sailing He Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical InstrumentationNational Engineering Research Center for Optical InstrumentsZhejiang UniversityHangzhou 310058China

A novel way to design arbitrarily shaped retro-reflectors by optics surface transformation is proposed. The entire design process consists of filling an optic-null medium between the input and output surfaces of the retroreflector, on which the points have 180 deg reverse corresponding relations. The retro-reflector can be designed to be very thin(a planar structure) with high efficiency. The effective working angles of our retro-reflector are very large(from-80 deg to +80 deg), which can, in principle, be further extended. Layered metal plates and zero refractive index materials are designed to realize the proposed retro-reflector for a TM polarized beam.

关键词： retro-reflector optics surface transformation

来源：评论

学校读者我要写书评

暂无评论

Application of distributed control system for monitoring and control of three tank level control 3

Application of distributed control system for monitoring and...

引用

3rd IEEE International Conference on Recent Trends in Electronics, Information and Communication Technology, RTEICT 2018

作者： Pooia, N.S. Ghatke, Manasa D'Souza, Sandra Instrumentation and Control System Engineering Manipal Institute of Technology Manipal India

ISBN: (纸本)9781538624401

In this paper describes our experiences designing controller to control the three tank level control system. The controller used is Distributed control system(DCS) using CentumVP software. We performed experiment measuring the Proportional Integral Derivative (PID) values. We found that our Distributed control system controller outperformed stable. © 2018 IEEE.

关键词： Distributed parameter control systems

来源：评论

学校读者我要写书评

暂无评论

An unsupervised hourly weather status pattern recognition and blending fitting model for PV system fault detection

引用

Applied Energy 2022年 319卷

作者： Jiaqi Qu Zheng Qian Yan Pei Lu Wei Hamidreza Zareipour Qiang Sun School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China School of Electronics and Information Engineering Beihang University Beijing China The Department of Electrical and Computer Engineering University of Calgary Calgary Canada State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

Detecting PV system faults in a timely fashion is important to ensure the safe operation of equipment and reduce their impact on the economy of the PV systems. It is necessary to further improve the time-sensitive performance evaluation of the system. However, the hourly weather scenario segmentations are seldom considered during the hour-level online monitoring process. Therefore, a hybrid method based on unsupervised hourly weather status pattern recognition and blending fitting model is proposed for hourly fault detection to improve the performance evaluation of PV systems. The proposed solution includes three parts, firstly, in the data preprocessing stage, the measured power with the errors and noise under normal operation situation caused by the environment changes is corrected by monthly linear fitting. Secondly, an unsupervised hourly weather status pattern recognition method is constructed using the measured radiation data, including unsupervised clustering and the Multiclass-GBDT-LR classification process. Finally, after eliminating the anomalies and errors, the blending fitting model of the hourly sub-weather status is established. Through the analysis of power plants in Australia and China, the proposed solutions are validated and evaluated to be superior to existing data-driven solutions in terms of fitting accuracy, detection validity, and response time. Numerical results of case studies indicate that the developed methodology under sub-weather has improved the detection accuracy up to 97.71% and 99.29% compared to benchmark models.

关键词： Photovoltaic systems performance Hourly fault detection Unsupervised hourly weather status pattern recognition Blending fitting model

来源：评论

学校读者我要写书评

暂无评论

Research on the under-voltage optimal control method of analytical sensitivity for power simulation training 4

Research on the under-voltage optimal control method of anal...

引用

2019 4th Asia Conference on Power and Electrical engineering, ACPEE 2019

作者： Xu, Zhengqing Yan, Faqi Zhou, Chaofang Xiao, Yanwei Sun, Shu-Qin Cao, Hua-Song Liu, Yu-Jie Beijing Kedong Electric Power Control System Co.Ltd. Beijing100192 China State Grid Huazhong Electric Power Control Subcenter Wuhan430077 China State Grid Zhejiang Electric Power Co. Hangzhou310007 China College of Instrumentation and Electrical Engineering Jilin University Lab. of Geo-Exploration and the Instrumentation Ministry of Education of China Changchun130026 China

As China increasingly interconnecting power system, more and more factors are interfering with the stable operation of the power system. Due to the lack of system reactive power and the overload, resulting in the increasingly problem of low voltage amplitude. Voltage is a measure of whether the power system operation is basically normal index, the voltage level of the power network determines whether the whole power system is stable or not. The dispatcher and operator need to answer any specific challenges to solve the under-voltage in training simulator. In this paper, based on the analytical sensitivity method, the basic principle of the low voltage problem is solved by the method of load shedding and reactive power compensation. Then the low voltage control method is optimized from two aspects of the load shedding load and reactive power compensation. The reactive power compensation with high sensitivity is presented. If the voltage of the compensation is not returned to the allowable range of the state, cutting the load operation according to the magnitude of the load-shedding sensitivity. Using power system simulation software to build a low voltage model of the IEEE-39 classic power system for the sensitivity index and the low voltage optimization control methods are analyzed and verified. © Published under licence by IOP Publishing Ltd.

关键词： Reactive power

来源：评论

学校读者我要写书评

暂无评论

On Hammerstein and Wiener structure for data driven modelling in complex and nonlinear systems;A case study in smart building integrated microgrid

引用

AIP Conference Proceedings 2023年第1期2580卷

作者： Reza Fauzi Iskandar Edi Leksono Endra Joelianto Koko Friansa Irsyad Nashirul Haq Dept. of Eng. Physics Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Engineering Physics School of Electrical Engineering Telkom University Bandung Indonesia Engineering Physics Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Instrumentation and Control Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Energy System Engineering Faculty of Industrial and Production Technology Institut Teknologi Sumatera Lampung Indonesia

Smart building integrated microgrid development shows attractive progress in research and application. Related structures of smart building and microgrid growth are more and more complex that requires sophisticated modeling methods. This situation may not simple, nonlinear, and distributed so difficult to obtain a related model analytically. This is an opportunity for researchers to develop a dynamic model from a data-driven modeling perspective. This paper aims to conduct a literature review and application study to map the potential and challenges of developing the Hammerstein and Wiener structure in complex and nonlinear systems modeling, as well as smart building integrated microgrid.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on distributed grid connected capacity optimization method for power system pre dispatch 4

Research on distributed grid connected capacity optimization...

引用

2019 4th Asia Conference on Power and Electrical engineering, ACPEE 2019

作者： Xu, Zhengqing Yan, Faqi Liu, Zhicheng Xiao, Yanwei Sun, Shu-Qin Yang, Jing Yan, Wen-Li Beijing Kedong Electric Power Control System Co.Ltd Beijing100192 China State Grid Huazhong Electric Power Control Subcenter Wuhan430077 China State Grid Zhejiang Electric Power Co.Ltd Hangzhou310007 China College of Instrumentation and Electrical Engineering Jilin University Lab. of Geo-Exploration and the Instrumentation Ministry of Education of China Changchun130026 China

The particle swarm optimization algorithm with adaptive weight and Newton-Raphson method are studied to connect the distributed energy to the grid in this paper. We will discuss the research status of the current stage of the project. The basic principles and processes of particle swarm optimization algorithm and Newton-Raphson method are expounded, and their improvement and combination are made (as well as their improvement and combination ) so that they can optimize reactive power for networks with distributed energy better. Then the improved algorithm is applied to the IEEE-14 and IEEE-30 models and the reconstruction results are analyzed. The network loss and reactive power of the reconstruction network are declined, the voltage quality is improved. The SIMULARTOR software is used to establish and calculate the power flow of original model and reconstruction model of IEEE-14 and IEEE-30 respectively. The economic factors with grid supply point and connected capacity are analyzed to obtain the best ratio of power system at the same time. Compared with the above results, the results are basically consistent, and the accuracy and reliability of the algorithm are verified. Finally, considering the economic factors of the system, adjusting the connected capacity of the distributed energy-wind power and photovoltaic, and obtaining the best access ratio (proportion), the economical efficiency of the system is improved, and it has referential value. © Published under licence by IOP Publishing Ltd.

关键词： Reactive power

来源：评论

学校读者我要写书评

暂无评论

Broadband Electromagnetic Wave Tunneling with Transmuted Material Singularity

引用

Physical Review Letters 2020年第20期125卷 207401-207401页

作者： Yichao Liu Fei Sun Yibiao Yang Zhihui Chen Jianzhong Zhang Sailing He Yungui Ma Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou 310058 China Department of Electromagnetic Engineering School of Electrical Engineering Royal Institute of Technology (KTH) S-100 44 Stockholm Sweden

Subwavelength channels filled with near-zero-index (NZI) media can realize extraordinary optical functionalities, for example, tunneling electromagnetic wave without reflections, but usually confined in a narrow wavelength band due to the material singularity (refractive index n≈0), which seriously limits the practical potentials. In this Letter, we show this limit can be fundamentally overcome by an alternative, named near-zero-index-featured (NZIF) structure, with the singularity transmuted via a controlled optical conformal mapping, enabling the device implementation with nonmagnetic normal dielectrics (i.e., relative permittivity >1). Their equivalence is strictly examined through a subwavelength tunneling waveguide. Classic wave tunneling features in a broad frequency range are revealed in various confined geometries. These properties are robust against the disturbance of several kinds of structural defects benefited from the infinite effective local wavelength. The broadband and lossless NZIF medium proposed here provides a promising way to pursue the fascinating light controlling functionalities as initially enabled by singular NZI materials.

关键词： Transformation optics Waveguides

来源：评论

学校读者我要写书评

暂无评论

Research on AC/DC Power Flow Optimization by Using Interior Point Method

Research on AC/DC Power Flow Optimization by Using Interior ...

引用

2019 4th Asia Conference on Power and Electrical engineering (ACPEE 2019)

作者： Shuqin SUN Yongbin LI Zhengqing XU Mingjia LI Can WANG College of Instrumentation and Electrical Engineering Jilin University Lab.of Geo-Exploration and the Instrumentation Ministry of Education of China Beijing Kedong Electric Power Control System Co.Ltd

At present,China's power system is developing in the direction of AC-DC parallel ***-DC hybrid transmission has become the inevitable pattern of China's future power *** the operation of AC/DC hybrid system,the optimization of multiple indexes is often *** of the economic problems of system operation is how to minimize the operation cost of the *** requires the optimal solution of a system of nonlinear equations with *** the existing algorithms,the interior point method has excellent convergence performance and has been widely used in power *** this paper,the basic principle of interior point method is introduced,and the interior point method is used to optimize the AC and DC power flow *** the network operation cost as the objective optimization *** Matlab software is used for programming and simulation *** the basis of verifying the effectiveness of the algorithm,the algorithm is transplanted into the large network for calculation and analysis,and the adaptability of the test algorithm.

关键词： Research on AC/DC Power Flow Optimization by Using Interior Point Method

来源：评论

学校读者我要写书评

暂无评论

Prediction of Production Performance for Tapioca Industry using LSTM neural network

Prediction of Production Performance for Tapioca Industry us...

引用

International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Pacharaphol Sonthited Diew Koolpiruk Warinthorn Songkasiri Control System and Instrumentation Engineering King Mongkut’s University of Technology Thonburi Bangkok Thailand Excellent Center of Waste Utilization and Management National Center for Genetic Engineering and Biotechnology Bangkok Thailand

Cyber-physical system (CPS) is integrated between the virtual and physical worlds that uses service-oriented architecture (SOA) to manage service objects such as production, quality control, and maintenance engineering. Moreover, the CPS will be more effective by using the predictive ability to integrate some service object of CPS. This paper presents an intelligence function on the top CPS platform which will be the prediction of production performance to detect yield malfunction by using affect parameter with a starch yield of each production units such as production rate, starch content, loss in the process, a temperature of the flash dryer, and moisture content of starch for adjust the production process before an actual failure situation. The prediction model uses historian data from the factory with data from a mass balance model simulation and uses a Long-Short Term Memory (LSTM) processing to get the yield predicted results to indicate the trend of change in yield or irregularities that may occur, which will be the information for the design or modification of the production plan or control the production to be appropriate before abnormalities in real situations. This model has an average accuracy of 90.55% of test dataset which is predicted 1 day in advance.

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：