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

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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Coordinate dispatch of combined heat and power system based on approximate dynamic programming 4

Coordinate dispatch of combined heat and power system based ...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

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

ISBN: (纸本)9781728196060

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. © 2020 IEEE.

关键词： Wind power

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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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Analysis of Assistant Reactive Shielding Coil for Electric Vehicle Wireless Charging System

Analysis of Assistant Reactive Shielding Coil for Electric V...

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Information Technology,Big Data and Artificial Intelligence (ICIBA), International Conference on IEEE International Conference on

作者： Shiliang Hou Bo Yu Wei Yan Chongming Zhu Ke Wang Zhenghao Wu College of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Laboratory of Start Grid Protection and Control of NARI Group Corporation Nanjing China

ISBN: (数字)9781728152240

ISBN: (纸本)9781728152257

To realize electromagnetic safety of wireless power transmission (WPT) system for electric vehicle (EV), the shielding methods should be analyzed. This paper proposes a method of using assistant reactive shielding coils to cancel the electromagnetic field (EMF) outside the working area of WPT system. By tuning compensation capacitance of shielding coil automatically, we design 3 cases with different location and shape of coils to achieve reactive shielding. By comparison and simulation, placing ring shielding coils above receiving (Rx) pad and under transmitting (Tx) pad is the best way to suppress EMF of WPT system's non-working area. The shielding coils' radius is slightly bigger than coupling coils' outer radius. This paper also provides a new method to realize WPT shielding system's automatic adjustment for resonance. Besides, assistant reactive shielding coils' cost is lower than traditional aluminum plate.

关键词： Capacitance Capacitors control systems Couplings Magnetic shielding Ferrites Topology

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Distributed Power Service Restoration Method of Distribution Network with Soft Open Point

Distributed Power Service Restoration Method of Distribution...

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IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Shoujing Sun Wei Cong Yaru Sheng Ming Chen Zhen Wei Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan China Key Laboratory of Smart Grid of Ministry of Education (Tianjin University) Tianjin China Qingdao Power Supply Company Shandong Electric Power Company State Grid Qingdao China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Soft open point (SOP) is applied to the power service restoration of the distribution network because of the advantages of flexible control mode and optimizing the operation of the distribution network. Taking advantage of parallel collaborative between independent peer smart terminals unit (STU) in distribution network and information interaction ways of working, distributed power service restoration method of distribution network considering soft open point is put forward, which brings the superiority of SOP in the aspect of power service restoration into full play and avoids the problem of large information collection and calculation in the centralized power service restoration method. Firstly, the structure, control mode and power service restoration model of SOP are introduced, and then the distributed power service restoration method of distribution network with SOP is described, which mainly includes distributed network topology search and the expression and calculation of constraint conditions. Finally, a numerical simulation is carried out to verify the effectiveness of the proposed method.

关键词： Switches Power supplies Network topology Topology Impedance Voltage control Switching circuits

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Research on Current Transfer Arc-Extinguishing Technology of Distribution Network 3

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

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3rd IEEE Conference on Energy Internet and Energy System Integration, EI2 2019

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

ISBN: (纸本)9781728131375

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. © 2019 IEEE.

关键词： Electric grounding

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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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Research on the Differential protection of the SFC Output Transformer for Pumped Storage Hydro Unit

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Journal of Physics: Conference Series 2021年第1期2005卷

作者： Feng Long Luofei Wan Shuyan Pan Xiaobao Liu Zhonglang Wang Ruichen Zhao State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu NARI Technology Co. Ltd. Nanjing Jiangsu 211106 China

Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection.

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