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

作者： Jifeng Li Jinghua Li Xingtang He Hao Luo Dalian Electric Power Supply Company State Grid Liaoning Electric Power Supply Co. Ltd Dalian China Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin University Tianjin China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University Jilin China

ISBN: (纸本)9781665434263

Under the background that countries all over the world constantly advocate energy conservation and emission reduction and seek to deepen the reform of power systems and introduce new energy trading policies, this study constructed a carbon-oriented local integrated energy system multi-energy coupling market architecture. This construct was aimed at problems that current multi-energy coupling market research has not considered, including multi-energy substitution characteristics and carbon emission factors. First, taking the local integrated energy system as the main physical architecture, a multi-energy coupling market architecture was constructed combining the main market participants of different energy subsystems. Second, a model of the subsystem markets in the energy coupling market, and the joint clearing method were proposed. Finally, the guiding role of the energy coupling market was analyzed by simulation for reasonable pricing and carbon emission reductions of different energy market operators.

关键词： Couplings Analytical models Costs Uncertainty Energy conservation Carbon dioxide Pricing

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Research on Protection for the Flexible Substation

Research on Protection for the Flexible Substation

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Huanhuan, Qi Zhanfeng, Deng Guoliang, Zhao Zhengang, Lu Linhai, Cai Chaoliang, Wang Feng, Xu State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd Beijing China State Grid Zhejiang Electric Power Research Institute State Grid Zhejiang Electric Power Co.Ltd. Zhejiang China

ISBN: (纸本)9781728135205

The equipment composition, networking form and functional characteristics of the flexible substation are different from the conventional substation and intelligent substation, and its protection has special characteristics. Based on the project of flexible substation, this paper proposes a three-layer protection system framework of in-situ protection, substation-area protection and wide-area protection for flexible substation, and analyzes the basic performance of protection reliability, selectivity and speed. The research results show that the proposed flexible substation protection system framework is reasonable and feasible, and it can be used as reference for the future design of the protection system structure in the smart grid and global energy Internet construction. © 2019 IEEE.

关键词： smart power grids

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Research on passive trigger technology of thyristor controllable arrester

Research on passive trigger technology of thyristor controll...

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The 16th IET International Conference on AC and DC power transmission (ACDC 2020)

作者： F. Li G. Qiao S. Chen Y. Jin G. Zhao W. Li Q. Shi Q. Feng State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute) 102209 Beijing China State Grid Corporation of China 102209 Beijing China State Grid Shanghai Electrical Power Company Research Institute 200437 Shanghai China

The operating and lightning overvoltage in UHV system can be deeply suppressed by the thyristor controllable metal oxide arrester (TCMOA), which means that the cost of insulation for key equipment in the system can be greatly reduced. Traditional triggering methods are no longer suitable for TCMOA because of the limitation of application scenarios, such as, insulation, volume, time delay, etc. Based on the V-I characteristic of BOD, in this paper, a passive and compact trigger circuit was designed and applied to the laboratory prototype for TCMOA. The transient impact of trigger circuit and prototype tests were carried out. The results show that, the circuit can be stably turned on at about 6kV, and the action voltage index of the prototype meets the design requirements.

关键词： arresters thyristors overvoltage protection trigger circuits lightning protection

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F-P ultrasonic sensor based on four-cantilever beam-supported structure

F-P ultrasonic sensor based on four-cantilever beam-supporte...

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22nd International Symposium on High Voltage Engineering (ISH 2021)

作者： K. Wu W. Chen Z. Zhang Y. Song J. Lei F. Liu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing People's Republic of China State Grid Fujian Electric Power Research Institute No. 48 Fuyuan Branch Road Cangshan District Fuzhou People's Republic of China State Grid Hubei Electric Power Research Institute No. 101 Xudong Street Hongshan District Wuhan People's Republic of China

Based on the principle of F-P (Fabry-Perot) interference, this paper designs an optical fiber F-P sensor with a four-cantilever beam-supported structure with a square diaphragm in the center, which improves the detection sensitivity of the partial discharge in Gas insulated switchgear (GIS), ensures the consistency of the insulation medium inside and outside the sensor and eliminates the influence of temperature changes on the sensor. Based on COMSOL, this paper analyzes the influence of the side length of the square diaphragm on the first-order natural frequency and static pressure sensitivity of the four-cantilever beam-supported structure. Through simulation, this paper selects the optimal size parameters to design the four-cantilever beam-supported structure with the first-order natural frequency of 26216Hz. Based on the optical detection platform, this paper uses Electric ignition to simulate partial discharge ultrasonic signals in the air. The measured first-order natural frequency of the sensor is 23709 Hz. This sensor can accurately detect the partial discharge in GIS.

关键词： cantilevers computerised instrumentation diaphragms electric ignition electric sensing devices fibre optic sensors frequency measurement gas insulated switchgear partial discharge measurement ultrasonic transducers ultrasonic variables measurement

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Entropy state calculation model for integrated energy systems

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Applied Energy 2025年 394卷

作者： Li, Yizhe Wang, Dan Li, Jiaxi Jia, Hongjie Zhou, Tianshuo Liu, Jiawei Cheng, Hao State key laboratory of Intelligent Power Distribution Equipment and System Tianjin University Nankai District Tianjin300072 China Key Laboratory of Smart Energy & Information Technology of Tianjin Municipality Tianjin300072 China State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute Changsha China Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha China

The integration of renewable energy sources and multi-energy networks in integrated energy systems (IES) introduces significant challenges related to energy degradation, driven by exergy losses during energy conversion/transmission and uncertainty-induced usability reduction. To address these issues, this study proposes a novel entropy state calculation model and analytical framework for assessing energy quality degradation within IES. By unifying thermodynamic entropy (quantifying physical exergy loss) and information entropy (capturing uncertainty-driven energy mismatch), the model integrates physical and information systems into a cohesive entropy state framework. The methodology is validated through a case study on a real-world IES in Tianjin, China (TJBC), demonstrating its capability to reveal entropy state distributions across subsystems under varying network structures and operational modes. Results highlight the dominance of energy conversion processes (e.g., combined heat and power units) in system-wide entropy increase and the critical role of renewable uncertainty in local energy quality degradation. The proposed framework provides a unified metric for optimizing energy efficiency, guiding infrastructure planning, and mitigating energy degradation in high-renewable-penetration IES, contributing to sustainable and high-quality energy system development. © 2025 The Authors

关键词： Conversion efficiency

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A New Method to Evalute Length Ratio of Positive and Negative Leaders in Breakdown Process of Composite Insulator String

A New Method to Evalute Length Ratio of Positive and Negativ...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Xiaopeng Liu Xiangen Zhao Juhyeong Lee Gang Liu Yi Zhang Junjia He State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Utah State University Logan United States State Key Laboratory of HVDC Transmission Technology China Southern Power Grid Guangzhou China

ISBN: (数字)9781728155111

ISBN: (纸本)9781728155128

It is important to evaluate the lightning performance of transmission lines, in which the flashover model of insulators plays a crucial role. The leader progression model (LPM) was widely used to simulate the insulator flashover process, and its implementation starts with the assumption that the positive and negative leaders develop with an equal length at both sides. However, some experiments [6], [9] provided evidences that this assumption may be not always true. To figure out the length ratio of the positive and negative leaders, the breakdown experiments of a 220kV composite insulator string suspended on an actual tower were carried out under the positive short tail lightning impulse (T f /T t = 0.6/8.6 μs). A new method, which could overcome the shooting speed limit of the camera, was proposed to distinguish the attachment point of positive and negative leaders. Experimental results indicate that the length ratio of the positive leader to the negative leader is not equal to 1, and increases with the applied voltage. A linear regression model was used to identify the correlation between the length ratio and UP/U50%, where UP is the voltage amplitude and U50% is 50% breakdown voltage.

关键词： Insulators Electric breakdown Lightning Cameras Discharges (electric) Breakdown voltage transmission line measurements

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A new short-circuit calculation method of power system with photovoltaic power sources

A new short-circuit calculation method of power system with ...

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作者： Gang Chen Jiafang Wu Yanhui Xiao Jiajia Hu Yunchao Chen Niancheng Zhou Ziyang Power Supply Company of State Grid Sichuan Electric Power Company State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

A large number of photovoltaic power sources connected to the grid will increase short-circuit current level of power system, and its fault transient process will change the fault characteristics of power grid. In this paper, the equivalent models of transient and steady state faults are obtained, by analysing the full current expression of photovoltaic power sources and its current characteristics in different fault stages. Based on the superposition theorem, the shortcircuit current calculation method of power system with photovoltaic power sources is ***, the effectiveness of the proposed method is verified by the analysis of actual power grid calculation examples, and the results can be used for power grid planning and relay protection setting.

关键词： A new short-circuit calculation method of power system with photovoltaic power sources

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A method for evaluating the uncertainty of short-circuit current in power system with photovoltaic power generation

A method for evaluating the uncertainty of short-circuit cur...

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作者： Jiafang Wu Gang Chen Yanhui Xiao Jiajia Hu Guoqiang Chen Weiyan Qian Niancheng Zhou Ziyang Power Supply Company of State Grid Sichuan Electric Power Company State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

Short-circuit current of power system with photovoltaic power generation is related to the fault current provided by the photovoltaic power supply. In this paper, based on the analysis of low voltage ride-through uncertain region of photovoltaic power generation, the random model of low voltage off-grid is constructed. Further combining with the system fault information, based on the monte carlo simulation, a probabilistic assessment method of shortcircuit current in power system is proposed, which takes into account uncertainty of photovoltaic low voltage ride-through. Finally, an example is given to verify the proposed method. The method in this paper comprehensively considers the random factors of power grid failure and photovoltaic power generation low voltage off-grid, and the short-circuit current result can accurately reflect actual short-circuit current level of the system.

关键词： IOP A method for evaluating the uncertainty of short-circuit current in power system with photovoltaic power generation

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Research on Low-Frequency Offshore Wind power transmission and Frequency Conversion technology

Research on Low-Frequency Offshore Wind Power Transmission a...

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

作者： Jing Ge Hongyang Yu Guoliang Zhao Zhanfeng Deng Chaoliang Wang Power Electronics Research Institute State Key Laboratory of Advanced Transmission Technology(Global Energy Interconnection Researching Institute Co. Ltd. Beijing China Smart Grid Research Institute State Grid Zhejiang Electric Power CO. LTD. Research Institute Hangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

This paper introduces three offshore wind power transmission modes, which are power frequency AC, flexible DC and low-frequency AC. Secondly, the key technologies including parameter design and control strategy of large-capacity AC/AC frequency converter used in low-frequency transmission system are studied. Then, it is verified by system modelling and simulation that one 400 MW offshore wind power transmitted by low-frequency has technical feasibility, and the correctness of parameter design and control strategy is also tested. Finally, it is summarized that within a certain transmission distance, low-frequency transmission mode has better technical and economic performance, and it could be one beneficial alternate mothed of offshore wind power grid-connected to the power frequency mode and flexible DC transmission mode.

关键词： Economics System integration Wind power generation Frequency conversion Internet Frequency control Optimization

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Applicability of Low Frequency transmission technology in Offshore Wind power transmission Scene 10

Applicability of Low Frequency Transmission Technology in Of...

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2020 10th International Conference on power, Energy and Electrical Engineering, CPEEE 2020

作者： Yang, Jian Ge, Jing Jiang, Zuofu Zhang, Chi Lv, Jianhua Ying, Guode Wu, Haohua State Grid Taizhou Electric Power Supply Company 31800 China State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Researching Institute Co. Ltd. State Grid Office Area North District of Future Science and Technology City Changping District Beijing102200 China Taizhou Hongchuang Electricity Group Limited Company 318000 China Taizhou Hongda Electric Construction Co. Ltd. Taizhou Economic Development Zone Operation and Mintenance Branch 318000 China

This paper investigates the worldwide development status of wind power and the main opinions and advantages of offshore wind power development in the industry, and summarizes that the development of offshore wind power will be in the direction of large capacity and distant sea area. At the same time, the distribution of wind energy resources in China's coastal areas is investigated, and combined with the constraints of offshore wind energy development in China, it is concluded that offshore wind power development in China will also develop to distant sea areas. Secondly, three transmission modes including power frequency AC, flexible HVDC and low frequency AC are briefly described, and the technical economy of the three modes is analyzed with typical cases. In addition, the technical feasibility of 400 MW offshore wind power grid-connected through low-frequency transmission technology is verified by system model building and simulation. Thirdly, combined with the development trend of offshore wind power, current research and manufacturing level, the opportunities and challenges of the application of low frequency transmission technology are analyzed. Finally, the main points of this paper are summarized. It is preliminarily clear that the low-frequency transmission mode has better technical and economic performance within a certain transmission distance, and can be used as a beneficial supplement to the conventional power frequency and flexible HVDC transmission mode. © 2020 The Authors, published by EDP Sciences.

关键词： HVDC power transmission

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