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International Conference on Electrical, control Engineering and Computer Science, ECECS 2015

作者： Xie, Penghao Yuan, Jiansheng Bi, Junjian State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Institute of Electrostatic and Electromagnetic Protection Mechanical Engineering College Shijiazhuang China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Institute of Electrostatic and Electromagnetic Protection Mechanical Engineering College Shijiazhuang China

ISBN: (纸本)9781138029378

In order to study the electromagnetic coupling law of one typical metal body, electromagnetic simulation software FEKO is utilized to set up the typical metal body model. With the increase of the simulation frequency, different lengths of metal body internal coupling field curve gradually separated, has certain regularity of fitting. Preliminary determination by reducing the length of the metal equivalent for the test model is established and confirmed in law of fitting better experimental spectrum. © 2016 Taylor and Francis Group.

关键词： Metals

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Optimal fuzzy logic based energy management strategy of battery/supercapacitor hybrid energy storage system for electric vehicles

Optimal fuzzy logic based energy management strategy of batt...

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World Congress on Intelligent control and Automation (WCICA)

作者： Chao Gao Jian Zhao Jian Wu Xiongbo Hao State Key Laboratory of Automotive Simulation and control Jilin University China

ISBN: (纸本)9781467384155

The main purpose of this paper is to describe a novel power management control strategy for battery and supercapacitor hybrid energy storage system with the objective that the load power demand would be distributed into the energy storage devices in a way that each device can be utilized optimally. The paper describes the design and control of such an on-board hybrid energy storage system. The specific control strategy is designed based on a fuzzy-logic controller (FLC), which offers the advantage of flexibility and robustness and has been widely applied to the energy management or power distribution of multiple power sources system of an electric vehicle, to avoid the low efficiency operation region of every power source and achieve high efficiency without degrading the mechanism performance. However, prior experience fuzzy logic supervisory control is often difficulty in realizing the optimal distribution between battery and supercapacitor. In the presented research, an optimization method based on gold ratio cut-off rule is proposed to design the degree of hybridization (DOH) and membership functions of the fuzzy controller, to realize the optimal performance of fuzzy logic controller. The proposed optimization method is simple and effective, and can be applied to the practical hybrid system directly. Finally, the effectiveness of the proposed method was examined by using ADVISOR simulation platform, and in which the hybrid energy storage system was developed and embedded into the electric vehicle model. The model parameters were gained from the tested vehicle. simulation results have shown that the proposed method can efficiently distribute the power between battery and supercapacitor to realize the design objective set forth.

关键词： Supercapacitors Batteries Fuzzy logic Vehicles Hybrid power systems Gold

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Travelling wave differential protection based on equivalent travelling wave

Travelling wave differential protection based on equivalent ...

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13th International Conference on Development in Power system Protection 2016 (DPSP)

作者： Lanxi Tang Xinzhou Dong Shenxing Shi Bin Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Dept of Electrical Engineering Tsinghua University Beijing China

Travelling wave (TW) differential protection fully utilizes the fault information contained in TW at both terminals of a transmission line, so it's a protection with high reliability and high selectivity. However, because TW differential protection needs a large amount of communication, it cannot be put into practical use. This paper proposes a TW differential protection which is based on equivalent travelling wave (ETW). Fault information is not lost during the process of getting ETW, so the proposed protection has the same reliability and selectivity with traditional TW differential protection. Because only several modulus maxima are needed to be sent to the opposite terminal, the traffic is largely reduced and the protection can operate much more rapidly. Extensive simulations validate the proposed protection.

关键词： wavelet transform differential protection equivalent travelling wave Duhamel integral

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A selection method of mutual inductance identification models based on sensitivity analysis for wireless electric vehicles charging

A selection method of mutual inductance identification model...

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IEEE Energy Conversion Congress and Exposition

作者： Fang Liu Zhengming Zhao Yiming Zhang Kainan Chen Fanbo He Liqiang Yuan State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781509007387

Wireless power transfer has been recognized as a promising technology for electric vehicles charging. However, the parking misalignments between the transmitter coil on the ground and the receiver coil inside the car may cause variations in the mutual inductance for the charging system, which will reduce its transfer power and efficiency. In order to improve the transfer efficiency and optimize the operating condition, it is essential to identify the mutual inductance. In this paper, identification models are studied with and without communication feedback from the receiver coil under two typical cases (resonant transmitter and inductive transmitter). A selection method based on sensitivity analysis is proposed to select models of high accuracy against measurement errors and sampling propagations. simulation and experimental results verify the effectiveness and validity of the proposed method. This work is helpful for evaluating and improving the wireless charging system's tolerance against misalignments as well as optimizing its operation condition.

关键词： sensitivity analysis wireless power transfer (WPT) mutual inductance identification

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Weighted H-index for identifying influential spreaders

arXiv

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arXiv 2017年

作者： Yu, Senbin Gao, Liang Wang, Yi-Fan Gao, Ge Zhou, Congcong Gao, Zi-You Institute of Transportation Systems Science and Engineering Moe Key Laboratory of Urban Transportation System Theory and Technology State Key Laboratory of Rail Traffic Control and Safety Center of Cooperative Innovation for Beijing Metropolitan Transportation Beijing Jiaotong University Beijing100044 Yinchuan Municipal Bureau of Big Data Management and Service Yinchuan750011

Spreading is a ubiquitous process in the social, biological and technological systems. Therefore, identifying influential spreaders, which is important to prevent epidemic spreading and to establish effective vaccination strategies, is full of theoretical and practical significance. In this paper, a weighted h-index centrality based on virtual nodes extension is proposed to quantify the spreading influence of nodes in complex networks. simulation results on real-world networks reveal that the proposed method provides more accurate and more consistent ranking than the five classical methods. Moreover, we observe that the monotonicity and the computational complexity of our measure can also yield excellent performance. Copyright © 2017, The Authors. All rights reserved.

关键词： Complex networks

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Modeling and simulation of unified power flow controller based on modular multilevel converters

Modeling and simulation of unified power flow controller bas...

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Annual Conference of Industrial Electronics Society

作者： Ye Xiaohui Chen Chuanbao Li Haifeng Song Xinli Liu Wenzhuo Meng Hang Zou Yan Power System Department China Electric Power Research Institute Haidian District Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source (North China Electric Power University) Baoding China Electric Power Dispatch and Control Center State Grid Jangsu Electric Power Company Nanjing China

As the development and building of 220kV and 500kV Unified Power Flow controller (UPFC) in Jiangsu grid of China, a higher requirement is put forward by power grid analysis on the accuracy of modelling and simulation. UPFC has different characteristics under different control strategies, and Modular Multilevel Converters (MMC) simulation is a difficult task. In order to study its dynamic characteristics, an electromagnetic model of UPFC based on MMC was proposed, which could simulate its different control strategies and relative dynamic characteristics. The proposed model was realized in PSD-PSModel program and verified using IEEE39 case. The simulation results show that the proposed UPFC model could provide effective tool for analysing the UPFC's dynamic characteristics.

关键词： Voltage control Integrated circuit modeling Mathematical model Bridge circuits Analytical models Load flow Power system dynamics

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

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The Journal of Engineering 2017年第13期2017卷 854-858页

作者： Han Wu Yan Li Zongxiang Lu Haiyan Tang State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Dept. of Electrical Engineering Tsinghua University) Haidian District Beijing 100084 People's Republic of China North China Electric Power Research Institute Co. Ltd Beijing 100045 People's Republic of China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Haidian District Beijing 100192 People's Republic of 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.

关键词： electric potential wind power photovoltaic power systems reactive power electric power generation reactive power sources wind-photovoltaic-ES hybrid generating system subsystems voltage balance optimisation

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Erratum: “Multiplicity results for stationary Kirchhoff problems involving fractional elliptic operator and critical nonlinearity in RN” [J. Math. Phys. 59, 071512 (2018)]

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Journal of Mathematical Physics 2018年第10期59卷

作者： Yueqiang Song Shaoyun Shi 1Scientific Research Department Changchun Normal University Changchun Jilin 130032 People’s Republic of China 2School of Mathematics and State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130012 People’s Republic of China

The author “V. Radulescu” should be replaced by the author “D. Repovš” in Ref. 22. Some errors are corrected in Refs. 25 and 42 as follows:

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The optimal circuitous communication route search for pilot protection based on ant colony algorithm

The optimal circuitous communication route search for pilot ...

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13th International Conference on Development in Power system Protection 2016 (DPSP)

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

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： penalty function pilot protection ant colony algorithm circuitous route dead end

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Sectoral Crediting Mechanism: How to Work in China

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Energy Procedia 2016年 88卷 187-192页

作者： Shuai Gao Can Wang State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC) and School of Environment Tsinghua University Beijing 100084 China Ministry of Education Key Laboratory for Earth System Modeling Center for Earth System Science Tsinghua University Beijing 100084 China

Using the method of conjoint analysis, this paper assesses corporate preferences for the policy alternatives of the sectoral crediting mechanism (SCM) aiming at supporting the discussions and development of this instrument. Data was collected in all 11 prefecture-level cities of Shanxi province, China. Modeling analysis confirms that companies are most concerned about the following three policy attributes, domestic policy instruments, the relationship with the clean developing mechanism (CDM) and the principle of Common but Differentiated Responsibilities (CBDR). Companies prefer a policy alternative that has a domestic policy instrument in which installations with voluntary targets receive tradable units, can co-exist with the CDM, and can get financial and technical assistance from developed countries. Meanwhile, the coverage of the SCM has the potential to expand to small companies that are the most inefficient under the premise of controlling transaction costs.

关键词： Sectoral crediting mechanism Companies Conjoint analysis China

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