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

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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.

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Research on Current Transfer Arc-Extinguishing Technology of Distribution Network

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

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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

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

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

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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

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

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

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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

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

Coordinated Control Strategy for Voltage and Frequency Suppo...

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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

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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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Research on low/high voltage ride through of PV gridconnected system based on control-hardware-in-the-loop

Research on low/high voltage ride through of PV gridconnecte...

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2019 Tsinghua International Doctoral Forum

作者： Shuang Li Gangquan Si Kai Qu Guoqing He State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Key Laboratory of Smart Grid School of Electrical Engineering Xi'an Jiaotong University Xi'an Shaanxi Province China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Haidian District Beijing China

ISBN: (纸本)9781839533907

Fault ride-through capability is one of the important grid-connection indexes for large-scale generation of PV power and other renewable energy, which is of great significance for the safe and stable operation of the grid. In order to improve the fault ride-through capability of PV grid-connected inverter, a comprehensive control strategy of LVRT/HVRT of PV gridconnected inverter based on conventional control scheme is proposed in this paper. Meanwhile, the LVRT/HVRT test platform of PV grid-connected inverter was built by using the simulation technology of RT-LAB hardware-in-the-loop. Firstly, based on the eHS (electric hardware solver) technology of RT-LAB real-time simulation software, a set of PV grid-connected inverter semi-physical simulation system was built, mainly including PV simulator, PV inverter, filter circuit, three-phase controlled voltage source, etc. Then, according to the technical specification of PV grid-connected inverter, the fault ridethrough control strategy of PV grid-connected inverter under the condition of voltage drop/rise symmetrically is proposed. Finally, the simulation tests of LVRT/HVRT were carried out on the simulation platform with the controller of PV inverter. Simulation results show that the proposed control strategy meets the grid-connected requirements during LVRT/HVRT. In addition, it has good dynamic and static characteristics.

关键词： PV grid-connected inverter control-hardware-in-the-loop LVRT HVRT Polydnaviridae Inventors ride-through control strategy

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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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