检索结果-内蒙古大学图书馆

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

Workload-Aware Scheduling for Data Analytics upon Heterogeneous Storage

Workload-Aware Scheduling for Data Analytics upon Heterogene...

引用

IEEE International Conference on Big Data and Cloud Computing (BdCloud)

作者： Zhuzhong Qian Yuan Gao Mingtao Ji Hui Peng Peng Chen Yibo Jin Sanglu Lu State Key Laboratory for Novel Software Technology Nanjing University Nanjing China NARI Research Institute NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing System R&D Center NARI Technology Co. Ltd. Nanjing State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing

ISBN: (数字)9781728143286

ISBN: (纸本)9781728143293

A trend in nowadays data centers is that equipped with SSD, HDD, etc., heterogeneous storage devices are widely deployed to meet diverse demands of various big data workloads. Since the reading performance of various storage devices are quite different, traditional concurrent data fetching easily incurs unbalanced use among devices. As a result, the straggler in terms of the data fetching, derived from the unbalanced use, directly increases the overall latency of data analytics. To avoid such unbalanced use on fetching large volume of data concurrently from storage devices, we formulate Workload-Aware Scheduling problem for Heterogeneous storage devices (WASH), the goal of which is to minimize the maximum data fetching time for parallel data analytical tasks. We design a randomized algorithm (rWASH) to select a proper source device for each task based on delicate calculated probabilities, which can be proved concentrated on its optimum with high probability. Extensive experiments show that rWASH reduces the average data fetching time for tasks by up to 55% over the state-of-the-art algorithms.

关键词： Task analysis Performance evaluation Data analysis Scheduling Data centers Probability Hardware

来源：评论

学校读者我要写书评

暂无评论

Coordinate Dispatch of Combined Heat and Power System Based on Approximate Dynamic Programming

Coordinate Dispatch of Combined Heat and Power System Based ...

引用

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

作者： Bo Hu Ding Liu Chuanzhi Zang Yue Wang Wanting Li Yuqi Liu Peng Zeng State Grid Liaoning Electric Power Co. Ltd. Liaoning Shenyang China Key Laboratory of Networked Control System Shenyang Institute of Automation Chinese Academy of Sciences Liaoning Shenyang China Chinese Academy of Sciences University Beijing China Liaoning Lightning Protection Technical Service Center Shenyang Liaoning China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

Combined heat and power (CHP) can simultaneously produce electrical and thermal energy. CHP is an important and main component of the power system in areas with heat demand. However, its operating mode limits the flexibility of the system and aggravates the waste of renewable energy. This paper presents a coordinate dispatch algorithm for electric heating integrated energy system (EHIES), a combined heat and power system with wind power. An efficient optimization algorithm based on dynamic programming (DP) is developed, which overcomes the challenges of solving high dimensional optimization problems for the EHIES. The results of simulation experiments show that the proposed coordinate dispatch algorithm can meet the scheduling time requirements, reduce the operating cost of the system and realize the full consumption of wind power.

关键词： Cogeneration Heuristic algorithms Wind power generation Dynamic programming Optimization Space heating Resistance heating

来源：评论

学校读者我要写书评

暂无评论

Optimized Decision Making for Power grid Safety Correction Based on Sub-regional Load control

Optimized Decision Making for Power Grid Safety Correction B...

引用

IEEE Information Technology and Mechatronics Engineering Conference (ITOEC)

作者： Yi WANG Xin SHAN Guoqiang ZHA tate Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9781538653746

In the case of large-scale power loss fault in the operation of UHV AC-DC hybrid power grid, it is impossible to adjust the grid correction control problem by the unit output adjustment. Fully utilize the adjustable capacity of the load control to achieve safety correction control to meet the load control aid decision-making requirements of existing dispatching system. According to the characteristics of the dispatching system in accordance with the sub-regional load as the target of unified implementation of load control, this paper proposes a safety correction optimized aid decision-making calculation method based on sub-regional load control, with the sub-regional load as the control object and the minimum sub-regional load as the target. Consider the system power flow constraint, the sub-regional controllable load constraint and the key monitoring section safety constraints, the continuous power flow method and the line planning method are combined to solve the problem. The proposed method has the characteristics of simple model, easy solution and good convergence. It shows the effectiveness of the proposed method in the actual power grid. 1

关键词： Power grids Load flow Load flow control Load modeling Sensitivity Optimization Safety

来源：评论

学校读者我要写书评

暂无评论

A Measurement Method for Wide-frequency Harmonic Signal in Power grid Based on Window Interpolation FFT and RLS-Adaline Neural Network

引用

Journal of Physics: Conference Series 2021年第1期1920卷

作者： Jiawei Peng Shuguo Pan Wenxiu Wang Min Zhang Jian Shen Wang Gao Chenglin Xia School of Instrument Science and Engineering Southeast University Nanjing Jiangsu 210096 China School of Electronic and Information Engineering Jinling Institute of Technology Nanjing Jiangsu 211169 China Nari Technology Co. Ltd Nanjing Jiangsu 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu 211106 China

With the increase of non-linear loads in power grid and the development of power electronics, the growing serious harmonic pollution has put forward higher requirements for the accuracy and real-time performance of the measurement method. For this problem, this paper proposes a wide-frequency harmonic signal measurement method based on window interpolation FFT and adaptive neural network. After the window function is selected, the frequency of harmonic is estimated by double-spectrum-line interpolation algorithm based on three-term third derivative Nuttall window, and then the smoothed frequencies are input into RLS-Adaline neural network to estimate the amplitude and phase of each harmonic. The simulation results show that the proposed method has higher measurement accuracy and stability under few data conditions and low signal-to-noise ratios than conventional window interpolation algorithms. High accuracy measurement of harmonics with short time window in the range of 0∼2.5kHz is effectively realized.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on Current Transfer Arc-Extinguishing Technology of Distribution Network

Research on Current Transfer Arc-Extinguishing Technology of...

引用

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

作者： Yi Xu Jianhua Li Xiangjun Zeng Kun Yu Xiaotao Che Fang Liu Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science & Technology Changsha China State Grid Luoyang Power Supply Company Luoyang China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

The premise of reliable arc extinguishing performance by current transfer arc extinguishing technology is to accurately identify the fault phase. This paper analyzes the neutral point voltage and the relative ground voltage variation law when single-line-to-ground (SLG) fault occurs, and obtains a SLG fault phase selection method. Then, an improved scheme for the fault-phase misjudgment and anti-phase short circuit of the current transfer arc-extinguishing device is proposed to improve its reliability. Finally, the action flow of the current transfer arc extinguishing device is described. The feasibility of the principle of current transfer arc suppression technology and the rationality of the action flow are verified by simulation analysis. The results show that the current transfer arc extinguishing technology can theoretically achieve the purpose of quickly eliminating the arc grounding fault, and help to improve the power supply reliability of the power distribution system.

关键词： Circuit faults Grounding Switches Power supplies Capacitance Monitoring Accidents

来源：评论

学校读者我要写书评

暂无评论

Support System for Operation Status Awareness and Troubleshooting of UHVDC Transmission System

Support System for Operation Status Awareness and Troublesho...

引用

2018 International Conference on Advanced control, Automation and Artificial Intelligence (ACAAI2018)

作者： Jinjun Lu Xin Shan Yi Wang Xi Xu NARI Technology Co.Ltd. State Key Laboratory of Smart Grid Protection and Control

The transmission capacity of ultra-high voltage direct current(UHVDC) transmission system is huge. Once a fault occurs, it will bring tremendous impact on the operation of the power grid, bring about a number of problems such as power flow overload, insufficient reserve, and frequency drop, and induce chain failure. Therefore, it is necessary to adopt a comprehensive Precautions. This article describes the specific ideas and implementation methods of solving problems from the overall solutions to the handling of UHVDC faults, the risk assessment and prevention in advance, the real-time monitoring of events, and the assistance in emergency recovery *** method mentioned above has been operated in some regional and provincial power companies for demo purpose, and has played an important role in the handling of DC blocking events many times.

关键词： Ultra-high voltage direct current(UHVDC) Risk assessment Assistance decision Preventive control Real-time monitoring

来源：评论

学校读者我要写书评

暂无评论

B2DASH: Bandwidth and buffer-based dynamic adaptive streaming over HTTP 3rd

B2DASH: Bandwidth and buffer-based dynamic adaptive streamin...

引用

3rd International Conference on Machine Learning and Intelligent Communications, MLICOM 2018

作者： Du, Peihan Wang, Jian Wang, Xin Xu, Zufeng Nanjing University Nanjing China 61428 unit of the Chinese People’s Liberation Army Beijing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 ChengxinRoad Nanjingjiangsu211000 China

ISBN: (纸本)9783030005566

Currently, video streaming technology is widely used for entertainment, advertising, social networking and so on. Dynamic adaptive streaming over HTTP (DASH) has largely replaced the previous release of streaming video using UDP. Many researchers have proposed algorithms to improve DASH performance. There are two types of methods: bandwidth-based and buffer-based. Both methods have pros and cons. In this article, we propose a DASH algorithm that takes both bandwidth and buffer into account. And we imitate the method of network congestion control to adjust bitrate of the video segment. The algorithm was implemented and tested, and compared with the state-of-the-art DASH algorithm–BOLA. The results showed that B2DASH outperformed BOLA for both the average bitrate and buffer rise time. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2018.

关键词： Adaptive algorithms

来源：评论

学校读者我要写书评

暂无评论

A Quick Generation Method for Power grid Graphs and Models in SCADA System

A Quick Generation Method for Power Grid Graphs and Models i...

引用

2018 2nd International Conference on Applied Mathematics, Modelling and Statistics Application (AMMSA 2018)

作者： Rongrong Cao NARI Technology Development Co. Ltd State Key Laboratory of Smart Grid Protection and Control

In the large power grid dispatching and control system, the unmanned substations bring a large amount of graph drawing and model input work to the automation maintenance personnel. The complicated work increases the error probability and hidden dangers, and it is difficult to adapt to the development of the large power grid. Therefore, it is very necessary to realize the quick generation method of power grid graphs and models in the large power grid dispatching and control system. This paper proposes a method for quick generation of graphs and models in SCADA system. This method is based on the design concept of object-oriented graph and model integration and realizes the quick generation of similar substations. This design has been used in real application widely and makes the maintenance of the automation system more conveniently, rapidly and accurately.

关键词： quick generation graph drawing model input graph and model integration

来源：评论

学校读者我要写书评

暂无评论

Coordinated control Strategy for Voltage and Frequency Support at Receiving End of an HVDC System

Coordinated Control Strategy for Voltage and Frequency Suppo...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Yi Guan Yan Cheng Linbo Yu Nan Wang Qiang Ma Shibo Wang Shumin Sun Yuejiao Wang Xingyou Zhang Peng Kou Shandong Power Dispatching & Control Center Jinan China Electric Power Research Institute of State Grid Shandong Electric Power Company Jinan China Shaanxi Key Laboratory of Smart Grid Xi’an Jiaotong University Xi’an China

ISBN: (纸本)9781728133997

Voltage and frequency support after commutation failure at receiving end of HVDC transmission system is studied in this paper. Commutation failures can cause temporary interruption of transmitted power, resulting in severe voltage and frequency deviation. In view of this, quick active and reactive power support is needed. To do this, a coordinated control strategy for combined system of synchronous condenser and energy storage is proposed. This strategy aims to provide fast substantive active and reactive power support, speeding up the process of system recovery. The control strategy is tested through simulations and the results demonstrated the effectiveness of the proposed scheme.

关键词： Reactive power Commutation HVDC transmission Voltage control Transient analysis Frequency control

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：