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Research and Demonstration Application of On-line monitoring and evaluation technology for primary frequency regulation in Renewable Energy Power Station

Research and Demonstration Application of On-line monitoring...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Liu, Dong Wang, Bo Shan, Xin Lu, TingXiang Ling, XiaoBo Tan, ZhenNing Zhu, JingKai Huang, Sheng Wang, ZhiHua NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China State Grid Shanghai Municipal Electric Power Company Shanghai200010 China

ISBN: (纸本)9781728135205

When the renewable energy power station is included, the primary frequency regulation(PFR) of the grid can make a big difference. New control methods are proposed to accommodate this *** this case,we propose an on-line monitoring and evaluation method which based on PMU dynamic data for PFR of renewable energy power station. Firstly, the characteristics of the PFR of the renewable energy power station are expounded. Secondly, quantitative evaluation indicators of PFR are proposed. Finally, the concrete implementation method and an application example are introduced. The method has been applied in practice and has obtained good application results. © 2019 IEEE.

关键词： Phasor measurement units

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Analysis and Testing of U.S.-China key Technology for Charging Interoperability of Electric Vehicles

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IOP Conference Series: Earth and Environmental Science 2021年第1期701卷

作者： X Zhang J Cui W Zhang J D Ye X L Li NARI Group Corporation/State Grid Electric Power Research Institute Nanjing 211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing Nanjing 211106 China

At present, China has overtaken the United states to become the world's largest new energy vehicle market. Due to differences in developmental trajectory, developmental mode, and charging standards, China and the U.S. have common interests and the foundation for cooperation, which can work together for a win-win development. Charging interoperability is the basis for ensuring charging safety and interchangeability of electric vehicles. This study examined and compared the differences between China and the U.S. in the standards for conductive AC charging of electric vehicles. The requirements for a control pilot circuit, proximity circuit, current capacity, and charging-state transition timing were analysed. Hierarchical and layered interoperability test cases based on GB/T 34657 and SAE J2953 series were presented. A dual interface interoperability test system was constructed and used to verify the test method rationale. The results provided a mutual inspection solution for AC charging equipment between China and the U.S. and accelerated global application and promotion of the electric vehicle industry.

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Distribution network protection method based on Hankel singular value decomposition and transient energy

Distribution network protection method based on Hankel singu...

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Intelligent Design (ICID), International Conference on

作者： Wei Long Shuyan Pan Tonghua Wu Wei Dai Dan Wu Kuncheng Zheng School of Electrical and Automation Engineering Nanjing Normal University Nanjing Jiangsu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu China Nari Group Corporation Nanjing Jiangsu China

As a new technology, 5G technology has a lower cost than optical fiber and a transmission speed and carrying capacity comparable to optical fiber. It can improve the performance of the distribution network communication system, and it also enables differential protection based on double-ended data coordination. The protection has a new life. The factors affecting the reliability of differential protection are mainly divided into the accuracy of the synchronization algorithm and the reliability of the protection algorithm. Starting from these two aspects, this paper uses the Hankel matrix singular value decomposition to achieve the synchronization of the double-ended fault time; and designs a method based on transient differential energy, which is consistent with the judgment by judging the continuous sampling points in the sliding time window. The number of data sampling points constitutes the condition of protection action. The proposed method can reliably act on short-circuit faults, ground faults and high-resistance faults that occur in the area, and will not malfunction for out-of-area faults, regardless of the type of fault, transition resistance and other factors. Finally, PSCAD/MATLAB is used to verify the feasibility of the proposed method.

关键词： Resistance Grounding 5G mobile communication Design methodology Distribution networks Synchronization Reliability

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Best practices in China Southern Power grid competition of AI short-term load forecasting

Best practices in China Southern Power Grid competition of A...

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

作者： Jixiang Lu Junxia Qian Qipei Zhang Shaobo Liu Feng Xie Hongsheng Xu State Key Laboratory of Smart Power Grid Protection and Control Nanjing China Jiangsu Keneng Electric Power Engineering Consultant Co. Ltd Nanjing China Technology Research Center NARI Group Corporation Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

China Southern Power grid (CSG) hosted a competition of AI short-term load forecasting with real-world load data in Sept 2019. NARI Technology was invited for the 10 days closed match and got the 2 nd prize among 28 top players in China, such as research institutes, universities, and system suppliers. This paper highlights the best practices we did in the competition: feature selection of short-term load forecasting, outlier data preprocessing for both load data and meteorological data, multiple head long short term memory (LSTM) neural network innovation and data augmentation with the benchmark. opportunities for improvements are considered as well.

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Reactive Power and Voltage Coordinated control of Wind Farm for Parallel Running STATCOM

Reactive Power and Voltage Coordinated Control of Wind Farm ...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Xu, Lufei Chen, Tianhua Yang, Luo Chen, Jianhua Du, Lei Zhong, Hailiang NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China State Grid Ningxia Electric Power Co. Ltd. Yinchuan750001 China

ISBN: (纸本)9781728135205

To solve the reactive power and voltage coordinated control of parallel running static synchronous compensator (STATCOM) in wind farm, a reactive power and voltage coordinated control strategy is proposed based on the united control mode of voltage control and reactive power control. The strategy makes full use of the control characteristics of STATCOM fast regulation and stable voltage, the voltage of the point of common coupling (PCC) connect with power system is quickly adjusted, and optimize the dynamic reactive power which reserve in wind farm. Finally, the wind farm in china wind power cluster area is taken as an example for practical application, the practical application results verify the correctness and effectiveness of the proposed control strategy. © 2019 IEEE.

关键词： Voltage control

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Novel active arc suppression and protection technology for distribution networks based on LPT injection

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Electric Power Systems Research 2025年 248卷

作者： Hongchun Shu Kaiqing Tian Zhiheng Yang Yue Dai State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming 650500 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming 650500 China Kunming Railway Vocational and Technical College Kunming 650208 China Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming 650500 China

To address the challenges of arc suppression and protection for single line-to-ground (SLG) fault in neutral non-effectively grounded distribution networks (DNs), a novel active arc suppression and protection technology based on Line-Phase Transformation Transformer (LPT) injection is proposed. First, a new LPT is designed to convert the line voltage into an inverse voltage of the fault phase and inject it to the neutral point of the distribution network (DN), utilizing the constant line voltage during SLG. This effectively suppresses the fault-point voltage, ensuring the reliable extinction of the fault arc during SLG. Furthermore, the zero-sequence current (ZSC) characteristics of each feeder are analyzed before and after the LPT disengagement; a fault feeder identification criterion based on the amplitude ratio of ZSC is established, and an active protection technology based on LPT injection is proposed, ensuring accurate and reliable fault-feeder identification. To assess the effectiveness of the method proposed in this article, a typical 10 kV distribution network (DN) simulation model is developed in PSCAD/EMTDC. Simulation results confirm that the proposed technical approach successfully suppresses SLG fault arcs and enables accurate fault-feeder identification, thereby enhancing the safety and reliability of DNs.

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Improving Convergence of IEEE 1588v2 Protocol Using Clock Servo System

Improving Convergence of IEEE 1588v2 Protocol Using Clock Se...

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International Conference on Communications, Signal Processing, and Systems, CSPS 2018

作者： Gu, Weiwen Yu, Yue Tong, Heqin Gao, Qin Zhang, Zhijian Wang, Jian School of Electronic Science and Engineering Nanjing University 163 Xianlin Road NanjingJiangsu210023 China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 Chengxin Road NanjingJiangsu211000 China

ISBN: (纸本)9789811362637

Precise time synchronization is widely used in several domains such as Internet of Things (IoT), communication industry, power system and so on. Among all-time synchronization protocols, IEEE 1588v2 Protocol has received extensive attention, due to its submicrosecond accuracy and high-cost performance. However, it is not great enough in the convergence performance of synchronization in software-only system. Therefore, the aim of this paper is to speed up the convergence by control the jitter in software-only system. There are several methods proposed to reduce the jitter brought by soft timestamp and nonreal-time operating system. We compare and analyze various methods and choose clock servo system to experiment. The results of experiments verify that the clock servo system reduces the convergence time and improves the synchronization accuracy to some extent. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Jitter

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Network Packet Capturing System for Communication Simulation in smart grid

Network Packet Capturing System for Communication Simulation...

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International Conference on Communications, Signal Processing, and Systems, CSPS 2018

作者： Ji, Qianyu Yang, Yibo Zhang, JunJing Yan, Yunsong Zhang, Zhijian Wang, Jian School of Electronic Science and Engineering Nanjing University 163 Xianlin Road NanjingJiangsu210023 China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation 19 Chengxin Road NanjingJiangsu211000 China

ISBN: (纸本)9789811362637

The next-generation electric power systems (smart grid) are studied to solve the energy crisis. Communication system simulation for the smart grid is of great significance. In this paper, we introduce a simulation system of a real power system. Meanwhile, we established a packet capture system to monitor the situation of the network and tested its performance under different bandwidths. We discussed the reasons that might influence the system’s performance and put forward some proposals for future work. © 2019, Springer Nature Singapore Pte Ltd.

关键词： smart power grids

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Unreasonable reactive power flow of traditional SVC and a novel SVC model against it

Unreasonable reactive power flow of traditional SVC and a no...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Ge, Huaichang Chen, Tianhua Chen, Hao Ding, Haoyin Guo, Qinglai Wang, Bin Xu, Fengda State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China East China Grid Corporation No. 882 Pudong South Road Shanghai200120 China

ISBN: (纸本)9781728135205

Recent years, various types of reactive power resources are installed in the power grid. Both of the complexity of and demand for better voltage regulation are increasing. AVC system is the most famous system-wide Q/V control system which consists of PVC, SVC and TVC. SVC controls the voltages of buses within a control zone by sending individual set-point values to PVCs belonging to the control zone. Traditional SVC assumes that PVCs within a control zone is decoupled and each PVC can reach the set-point value during a control period. However, the proof in this paper reveals the fact that if there are strongly coupled PVCs in a control zone, the competition between those PVCs will cause unreasonable reactive power flow. PVCs can't reach their set-points so a deviation of Q output is induced. In this paper, a novel SVC model is proposed so as to eliminate the Q deviation. Simulation work verified the proof and demonstrated the effectiveness of the proposed SVC model. © 2019 IEEE.

关键词： Electric load flow

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Design and Implementation of an Automated Test Framework for Electric Power Data Network based on the Unified Resource Scheduling

Design and Implementation of an Automated Test Framework for...

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International Conference on Advanced Power System Automation and protection (APAP)

作者： Ting Hu Qin Li Xin Huang Xiaoyang He Nari Group Corporation/State Grid Electric Power Research Institute Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

Traditional Electric Power Data Network (EPDN) device tests are implied manually with the testing resources utilized separately. Such way of testing is of low efficiency and is difficult for the management of device resources. With the rapid increase of testing tasks in the future, improving the test efficiency and the resource utilization is of great importance to the development of EPDN. In this article, we propose a novel automated test framework for EPDN. In particular, we abstracts the related knowledge from data of real world experimental resources and testing business, based on the extracted knowledge, we combine virtualization technology with automated testing technology and software quality management, and proposes an automated test framework with unified scheduling of testing resources. The proposed framework is evaluated with the task of route flapping testing. The provided test flow and test results prove the feasibility and the effectiveness of the proposed framework.

关键词： Testing Job shop scheduling Task analysis Instruments Routing protocols Cloud computing Topology

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