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13th International Conference on Development in power system Protection 2016, DPSP 2016

作者： Chen, Xin Bo, Zhiqian Dong, Xingzhou Shi, Shenxing Wang, Bin State Key Laboratory of Control and Simulation of Power System and Generation Equipments China Xuji Group Corporation China

ISBN: (纸本)9781785618260

With the development of smart grid, the self-healing ability of protection device becomes much more important. Pilot protection is of good selectivity, but it needs a highly reliable communication network. Once the communication line between two devices is out of work, pilot protection will be forced out of operation. Since there are many ring structures in communication network, circuitous routes can be found to help pilot protection remain operational. In this paper, ant colony algorithm (ACA) are used to find the optimal circuitous route, and simulation results show the method is fast and accurate. To the actual communication network of power system, each node is just connected to a few other nodes, so the search process often come to dead ends. Use penalty functions can reduce the probability of coming to a dead end and improve the algorithm efficiency. The whole route accelerating penalty function is most efficient.

关键词： Timing circuits

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A Multi-Objective Model with Probability Constraints of Trans-Provincial Hydropower Consumption Considering Dynamic Stability Limit

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IOP Conference Series: Materials Science and Engineering 2019年第1期692卷

作者： Ke Yang Rui Mao Xu Wen Chuncheng Gao Miao Huang Wei Yan Southwest Subsection of State Grid Chengdu China State Key Laboratory of Power Transmission Equipment & System Security and New Technology(Chongqing University) Chongqing China College of Automation Chongqing University of Posts and Telecommunications Chongqing China Beijing Ke Dong Electric Power Control System Co. Ltd.Beijing China Nari Group Corporation/State Grid Electric Power Research Institute Nanjing China

With the rapid development of clean energy and serious delay of grid construction, water abandonment is becoming more and more severe. Under this condition, this paper proposed a multi-objective model with probability constraints of trans-provincial hydropower consumption considering dynamic stability limit. Firstly, a mathematical expression about the dynamic stability limit of trans-provincial channel is constructed. Secondly, a risk assessment index of abandoned water is established on the basis of semi-absolute deviation. Then, based on the framework of stochastic programming, a multi-objective model with probability constraints is proposed for hydropower transmission in trans-provincial trade. By means of genetic algorithm with embedded Monte-Carlo simulation technology, the model can be solved efficiently. Finally, data of Tibet power grid is calculated to verify the validity and universality of the research. The results show that the established model can achieve optimal economic benefit between grid companies and generation enterprises, and also effective management of water abandonment risk.

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The Actual Operation of Transmission Line and Evaluation of the Reclosing Time of Reclosure

The Actual Operation of Transmission Line and Evaluation of ...

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2017 International Conference on Mechanical and Mechatronics Engineering(ICMME2017)

作者： Rui-ming OU Gun YANG Zhan-qing YU Jin-bo WU Shui-ming CHEN Hong-jun ZHEN Qingyuan Power Supply Bureau of Guangdong Grid Company State Key Lab.of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua University

In this paper,the actual trip of typical transmission line is *** includes the trip frequency of transmission lines and the tripping frequency caused by lightning,seasonal distribution characteristics of transmission line trip,and the success rate of reclosing on the transmission *** this paper,the probability of the occurrence of the trip again is evaluated based on the duration of ground lightning *** the increase of the time of reclosure,the probability of the occurrence of the trip will *** this calculating method,the average probability of tripping of reclosure decreased significantly during a ground lightning stroke process,when the reclosing time t0 is 1 s.

关键词： Trip of transmission line Trip caused by lightning Reclosing time of reclosure Probability of tripping of reclosure

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The Method for Evaluating the Reclosing Time of Reclosure Based on Lightning Parameters

The Method for Evaluating the Reclosing Time of Reclosure Ba...

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2017 International Conference on Mechanical and Mechatronics Engineering(ICMME2017)

作者： Gun YANG Zhan-qing YU Hong-jun ZHEN Chao SU Shui-ming CHEN Rong ZENG Jin-liang HE State Key Lab.of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua University Qingyuan Power Supply Bureau of Guangdong Grid Company

The fault of transmission line is mostly caused by lightning,and a ground lightning stroke process is often accompanied by multiple *** duration of ground lightning stroke are also *** this paper,a method for evaluating the reclosing time of reclosure based on lightning parameters is *** addition,this paper also gives an expression for the cumulative rate of the duration of ground lightning stroke,and an expression for probability distribution of the amplitude of lightning current in Guangdong *** also proposed a method for calculating the probability of tripping of *** this calculating method,the average probability of tripping of reclosure is less than 1/10000 during a ground lightning stroke process,when the reclosing time t0 is greater than 1.012 s.

关键词： Ground lightning stroke Lightning parameters Reclosing time of reclosure Probability of tripping of reclosure

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Voltage balance optimisation among subsystems of wind-photovoltaic-ES hybrid generating system

Voltage balance optimisation among subsystems of wind-photov...

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6th International Conference on Renewable power generation

作者： Wu, Han Li, Yan Lu, Zongxiang Tang, Haiyan State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China North China Electric Power Research Institute Co. Ltd Beijing100045 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Haidian District Beijing100192 China

Wind-photovoltaic-energy storage (ES) hybrid generating system has numerous reactive power sources. It is crucially important for coordinated control of these reactive power sources. According to the test results, there are unbalanced control problem in subsystem voltage of the hybrid generating system. The problem caused reactive power circulation and loop current. A subsystem voltage balance optimisation strategy is proposed to solve the problem. The case study shows the efficiency of the proposed strategies. © 2017 Institution of Engineering and Technology. All rights reserved.

关键词： Reactive power

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Optimization of hydrogen yield of a high-temperature electrolysis system with coordinated temperature and feed factors at various loading conditions: a model-based study☆

arXiv

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arXiv 2018年

作者： Xing, Xuetao Lin, Jin Song, Yonghua Hu, Qiang Zhou, You Mu, Shujun State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China Department of Electrical and Computer Engineering University of Macau Macau China Tsinghua-Sichuan Energy Internet Research Institute Chengdu610213 China National Institute of Clean and Low Carbon Energy Beijing102211 China Zhejiang Zhentai Energy Tech. Co. Ltd. Lishui Zhejiang Province321400 China

High-temperature electrolysis (HTE) is a promising technology for achieving high-efficiency power-to-gas, which mitigates the renewable curtailment while promoting decarbonization by transforming wind or solar energy into fuels. Different from low-temperature electrolysis, a considerable amount of the input energy is consumed by auxiliary equipment in an HTE system for maintaining the temperature, so the studies on systematic energy description and parameter optimization of HTE are essentially required. A few published studies investigated HTE’s systematic optimization based on simulation, yet there is not a commonly used analytical optimization model which is more suitable for integration with power grid. To fill in this blank, a concise analytical operation model is proposed in this paper to coordinate the necessary power consumptions of auxiliaries under various loading conditions of an HTE system. First, this paper develops a comprehensive energy flow model for an HTE system based on the fundamentals extracted from the existing work, providing a quantitative description of the impacts of condition parameters, including the temperature and the feedstock flow rates. A concise operation model is then analytically proposed to search for the optimal operating states that maximize the hydrogen yield while meeting the desired system loading power by coordinating the temperature, the feedstock flows and the electrolysis current. The evaluation of system performance and the consideration of constraints caused by energy balances and necessary stack requirements are both included. In addition, analytical optimality conditions are obtained to locate the optimal operating states without performing nonlinear programming by further investigating the optimization method. In the case study, a numerical case of an HTE system is employed to validate the proposed operation model and optimization method, which proves that the proposed operation strategies not only improve the overal

关键词： Hydrogen production

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The Research of the Insulation Coordination of the Transmission Lines with Parallel Gaps in More Thunderstorm Region

The Research of the Insulation Coordination of the Transmiss...

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2017 International Conference on Mechanical and Mechatronics Engineering(ICMME2017)

作者： Zhu-wen OU Jin-bo WU Hong-jun ZHEN Zhan-qing YU Jin-liang HE Qingyuan Power Supply Bureau of Guangdong Power Grid Co. LTD State Key Lab.of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua University

Parallel gaps,as a new mode of "channel" type lightning protection,can do it with the sub insulator arc distance to effectively protect the insulator,but the corresponding line tripping rate will be affected because of this;Development method based on the leader in this paper the calculation method of the lightning path,the typical used tower of guangzhou trip rate change after the application of parallel gap situation has carried on the analysis,got a short distance and adopt reasonable reinforced insulation,the trip rates did not rise significantly.

关键词： Parallel gaps A lightning strike tripping rate Insulation coordination

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The Research of Asymmetric Parallel Gaps in EHV Transmission Lines

The Research of Asymmetric Parallel Gaps in EHV Transmission...

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2017 2nd International Conference on Electrical and Electronics: Techniques and Applications（EETA2017）

作者： Jin-bo WU Zhan-qing YU Hong-jun ZHEN Chao SU Rong ZENG Jin-liang HE State Key Lab.of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Electric Power Science Institute of Yunnan Power Grid Co. Ltd

As a new kind of lightning protection, parallel gaps have simple structure, easy installation, good economy, and many other advantages. The traditional parallel gap due to the large short distance, can lead to lightning trip-out rate increases. Based on arc movement characteristics this paper presents a design of new type of parallel gaps and the analysis of the surface field strength, and the verification test, design a new kind of parallel gap are obtained.

关键词： Arc movement Parallel gaps Surface electrical field

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A bi-level trading model for an active distribution company considering demand response exchange

A bi-level trading model for an active distribution company ...

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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Cai, Yu Lin, Jin Wan, Can Song, Yonghua Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781509054183

With widely utilization of distributed generations (DGs) and demand response (DR), the active distribution network (ADN) becomes a more proactive and strategic consumer in electricity markets to procure its energy needs at the minimum cost. Under this background, this paper proposes a bi-level trading model for a strategic ADN to minimize its operation cost in the day-ahead market. The upper level model represents the cost minimization of the ADN energy acquisition with consideration of DR, and the lower level model includes the day-ahead market clearing. Based on the complementarity theory and linearization techniques, the proposed bi-level model can be transformed into a mixed integer linear programming (MILP) problem. Comprehensive case studies demonstrate the efficiency and effectiveness of the proposed strategic trading model for an ADisCo with DGs and DR with respect to nonstrategic bidding approaches. © 2016 IEEE.

关键词： Distributed power generation

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Fault diagnosis for multi-energy flows of energy internet: Framework and prospects

Fault diagnosis for multi-energy flows of energy internet: F...

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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Wang, Tao Wang, Jun Fan, Zhennan Wei, Xiaoguang Zang, Tianlei Pérez-Jiménez, Mario J. Huang, Tao School of Electrical Engineering and Electronic Information Sichuan Province Key Laboratory of Power Electronics Energy-saving Technologies and Equipment Key Laboratory of Fluid and Power Machinery Ministry of Education Xihua University Chengdu China School of Electrical Engineering Southwest Jiaotong University Chengdu China State Key Laboratory of Security Control and Simulation of Power Systems and Large Scale Generation Department of Electrical Engineering Tsinghua University Beijing China Research Groupon Natural Computing Department of Computer Science and Artificial Intelligence University of Sevilla Sevilla Spain Department of Energy Politecnico di Torino Torino Italy

ISBN: (纸本)9781538614273

Energy Internet (EI) is an inevitable development trend of energy systems under the background of technology development, environmental pressure and energy transition. Multi-energy flow coupling is one of the key characteristics of the EI, which enhances the interoperability of different types of energy flows while consequently increases the probability of cascading failures. Therefore it is of great significance to study the multi-energy flow fault diagnosis of the EI to ensure its safe and stable operation as well as the continuous energy supply. This paper introduces the concept of multi-energy flow cascading fault of the EI for the first time. The energy internet framework for multi-energy flow cascading fault diagnosis is firstly proposed, and then characteristics of various energy networks in the EI are analyzed from the perspective of fault diagnosis. Finally, future research prospects are discussed. © 2017 IEEE.

关键词： Failure analysis

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