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Vertically integrated outdoor in-site line protection based on SoC technique

Global Energy Interconnection 2018年第2期1卷 179-186页

作者： Tonghua Wu Yuping Zheng Yutao Qiu Xiaoping Zhang Gang Yao Jimin Chai Xiaofan Hou College of Energy and Electrical Engineering Hehai University NARI Group Corporation/State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control State Grid Zhejiang Electric Power Corporation Electrical and System Engineering University of Birmingham

By focusing on the problems of speed, reliability, operation and maintenance in the practical application of line protection in conventional and smart substations, we propose system architecture and a technical scheme for in-site(similar in meaning to on-site or near-process) line protection based on vertical integration and outdoor installation. The functions of the single-bay merging unit, relay protection, and intelligent terminal are vertically integrated to reduce the number and types of devices, simplify the configuration, reduce signal transmission, and shorten the protection action time. In addition, this vertically integrated device is applied to provide data acquisition and control execution support for substation-area protection, security and stability of devices, and other substation-area devices. The vital performance outputs are tested and compared. Finally, the experimental results verify that the proposed scheme is feasible and the technology is advanced.

关键词： Line protection In-site relay protection Merging unit Vertical integration

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

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

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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

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Performance evaluation of ad-hoc routing protocols in hybrid MANET-satellite network 3rd

Performance evaluation of ad-hoc routing protocols in hybrid...

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

作者： Xie, Xiaoye Wang, Jian Guo, Xiaobo Wu, Xiaogang Nanjing University Nanjing China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory The 54th Institute of CETC ShijiazhuangHebei China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 Chengxin Road Nanjing China

ISBN: (纸本)9783030005566

Hybrid MANET-satellite network is a natural evolution in achieving ubiquitous communication. Their combination gives full play to respective advantages—autonomy and flexibility of MANET, wide coverage and resilience to natural disasters of satellite network. Although large quantities of researches have been conducted on hybrid MANET-satellite network, there are relatively few researches on its routing. In this paper, we construct a basic model of hybrid MANET-satellite network and explore the performance and applicability of ad-hoc routing protocols in hybrid network. Simulation results by NS3 demonstrate that the hybrid network working in ad hoc manner can acquire the performance that conforms to the standard of QoS. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2018.

关键词： Satellites

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混合多端直流输电系统保护方法研究

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Engineering 2021年第8期7卷 65-88页

作者：郑玉平何佳伟李斌吴通华戴魏李晔 State Key Laboratory of Smart Grid Protection and Control State Grid Electric Power Research Institute (NARI Group Corporation) College of Energy and Electrical Engineering Hohai University Key Laboratory of Smart Grid of Ministry of Education Tianjin University

近年来，混合多端直流输电系统快速发展。但是，在混合直流系统中应用的电压源换流器（voltage-source converter, VSC）出口不再需要直流滤波器。此外，考虑到其直流故障电流可被换流器自身有效抑制，直流线路两端也不再需要安装限流... 详细信息

近年来，混合多端直流输电系统快速发展。但是，在混合直流系统中应用的电压源换流器（voltage-source converter, VSC）出口不再需要直流滤波器。此外，考虑到其直流故障电流可被换流器自身有效抑制，直流线路两端也不再需要安装限流电抗器。这意味着线路两端边界缺失，导致应用于常规高压直流输电（line commutated converter based high-voltage direct current, LCC-HVDC）系统和柔性直流（VSC-HVDC）电网的单端量保护均无法适用于混合多端直流输电系统。为此，本文提出了一种适用于混合多端直流输电系统的单端量保护新原理，该方法主要基于暂态信息和主动注入思想实现故障辨识。与应用于LCCHVDC和VSC-HVDC系统的单端量保护相比，所提方法无需依赖线路两端的边界元件，因此更加适用于混合多端直流系统。大量的仿真算例充分验证了所提方法的可行性和优越性。

关键词：混合多端直流输电系统单端量保护暂态量信息主动注入

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Day-ahead optimal scheduling of integrated energy system with electric heat pump

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IOP Conference Series: Earth and Environmental Science 2020年第1期431卷

作者： Nianchu Zhang Qi Wang Ming Ni Manli Li Zheng Zhang Nanjing Normal University (College of Electrical and Automation Engineering) Nanjing China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

The regional integrated energy system is an effective way to realize energy cascade utilization and improve the flexibility and economy of the load side operation. Combine cooling heating and power (CCHP) system is a typical form of integrated energy systems. However, due to heat-load-based operation mode, the peak modulation capacity of CCHP units and the accommodation of renewable energy are limited. This paper explores methods of increasing the flexibility and economy of the system. An optimal scheduling model is proposed for integrated energy systems containing an electric heat pump, considering heating network characteristics. Simulation results show that the electric heat pump can help the system realize heat-and-power decoupling, improve the flexibility of the system and reduce the operating cost of the system.

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A correction method for HVDC transmission plan considering the correlation between sending end new energy generation and receiving end loads

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Energy Procedia 2018年 145卷 193-198页

作者： Liang Lei Wang Julong Li Mingying Chen Ming NARI Technology Co. Ltd. Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106 China

Recently, new energy is conversely distributed and centralized grid connection which need transmit redundant power to other regions urgently by HVDC system. Based on the characteristics of new energy, this paper analyzes the correlation between sending end new energy and receiving end loads by person correlation coefficient method and proposes a correction method for HVDC transmission plan considering the correlation which promotes new energy penetration level and improves utilization of HVDC system. By taking a HVDC system as an example, the results of analyzing practical scheduling data in 2015 demonstrate the feasibility of the proposed method.

关键词： New energy Correlation coefficient method HVDC transmission plan

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The operation analysis of the CCHP driven by Gas-steam combined cycle

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IOP Conference Series: Earth and Environmental Science 2020年第5期558卷

作者： Junyu Liang Xingyu Yuan Jiangqi Gu Yunnan Electric Power Research Institute CSG China NARI Group Co. Ltd The State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better; in summer operating conditions, the indicator of following the electric load (FEL) is better; during the transition season, the value of PEC is better in the case of following the thermal load.

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A method of automatic generation of daily work report for power dispatching based on RoBERTa

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IOP Conference Series: Materials Science and Engineering 2020年第1期853卷

作者： Jie Li Tao Zhang Hao Li Jixiang Lu Jinjun Lu Ziqi Li State Grid Jiangsu Electric Power Co. LTD Technology Research Center of NARI Group Corporation Nanjing China State Key Laboratory of Intelligent Power Grid Protection and Operation Control Nanjing China

Power dispatching operators need to read a large number of power dispatching logs every day and arrange them into daily work reports. It takes them a lot of time to do information extraction and transfer that information into work reports. In order to reduce the workload of power dispatching operators, we propose an intelligent method for automatic generation of daily work reports in this paper by adopting RoBERTa, which is an improved version of BERT. With the outstanding performance of RoBERTa in semantic analysis and entity recognition, the workload of power dispatching operators is reduced approximately 50% through our proposed method, which means the efficiency is greatly improved.

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Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory

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IOP Conference Series: Materials Science and Engineering 2020年第6期768卷

作者： Wei Zheng Jie Yu Hongjie Tian Peng Li Chenning Wu Mengfu Tu School of electrical engineering Southeast University Nanjing 210096 China Ningxia Power Exchange Center Company Yinchuan 750001 China Nanjing SAC Power Grid Automation Co. Ltd Nanjing 210096 China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106 China

In this paper, the non-intrusive monitoring and disaggregation method of industrial load based on Petri net theory is studied. First, the basic concepts of Petri nets are introduced. On the basis of prototype Petri nets, time factor is added. Then, the Petri net with time factor is combined with industrial load production process. Considering the production sequence, start-stop time and production time constraints of industrial load, a non-intrusive monitoring and disaggregation model of industrial load is constructed. Finally, according to the actual production process of industrial load, the electricity consumption situation of each production link is calculated, and the detailed analysis results of industrial user's electricity consumption behavior are obtained. The research could provide an important reference for realization of friendly interaction between industrial users and power grid.

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

Support System for Operation Status Awareness and Troublesho...

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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

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