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International Conference on High Voltage Engineering and Application, ICHVE

作者： Jianlin Hu Binhuan Lan Yao Wu Xingliang Jiang Zhijin Zhang Qin Hu Ke Xu State Key Laboratory of Power Transmission Equipments & System Security and New Technology College of Electrical Engineering Chonzuinz University Chonzqinz China State Key Laboratory of Power Transmission Equipments & System Security and New Technology College of Electrical Engineering Chongqing University China Chongqing Electric Power Transmission & Transformation Grid Chongqing Electric Power Company China

ISBN: (纸本)9781479966141

The motion mechanism of the supercooled droplets on insulator surfaces with superhydrophobic coating will affect the amount and distribution of droplets, which further affects the icing on surfaces. In this paper, the tests were carried out to explore the motion process of the droplets before frozen on superhydrophobic surfaces under the condition of continuously spray supercooled droplets in artificial climate chamber. The motion properties of water droplets on superhydrohobic surfaces and its influencing factors such as Contact Angle (CA), Contact Angle Hysteresis (CAH) and roughness were investigated. Besides, the artificial icing tests for glass insulators with different superhydrophobic or hydrophobic coatings were carried out and the influences of motion properties on icing of insulators were analyzed. The results show that the larger CA and roughness are and the smaller CAH is, the easier it is for droplets to roll off and the better motion property is, causing the longer icing delay time of insulators.

关键词： Logic gates Glass Coatings Microscopy Silicon Adhesives Jacobian matrices

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Research about the power consumption detection technology of charger considering the harmonic and unbalanced current

Research about the power consumption detection technology of...

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International Symposium on Fundamentals of Electrical Engineering (ISFEE)

作者： Zheng Ke Hu Xiaorui Ji Jing Liu Kai State Grid Chongqing Electric Power Corporation Research Institute Chongqing China State Key Laboratory of Transmission and Distribution Equipment and System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781479968220

In this paper, an electric vehicle charging posts(charger) power consumption detection technology based on harmonic wave and preventing leakage circuit breaker current imbalance technology is proposed. Firstly, for the working characteristics of electric vehicle charging posts, by studying harmonic characteristics produced by electric car charging posts, this paper analyzes harmonic effects on power measurement. And based on the Fast Fourier Transform (FFT) principle, the harmonic energy measurement method of car charging posts is studied. Since each phase current of charging post imbalance, to prevent the sum of each phase current vector of charging posts over the protection current threshold and the charging post breaker misusing in power circuit, preventing leakage circuit breaker current imbalance system is designed. Finally, this paper studies the power consumption detection methods of electric vehicle charging posts, and designs charging post power metering device.

关键词： Harmonic analysis power demand Electric vehicles power measurement power harmonic filters Ports (Computers)

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An optimal approach for smart grid economic dispatch

An optimal approach for smart grid economic dispatch

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IEEE General Meeting power& Energy Society

作者： Jizhong Zhu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China ALSTOM Grid Inc. Redmond WA USA

smart grid economic dispatch (SGED) is more complicated than the traditional economic dispatch since it involves the operation of the uncertain renewable energy resources, as well as chargeable and dischargeable storage. This paper presents an approach to solve the smart grid economic dispatch problem using a two-stage optimization method. The proposed SGED model contains wind power generation and the storage provider. The first stage involves the fixed wind power generation, which is estimated and also cannot be adjustable. The second stage involves smart grid economic dispatch considering network loss and security constraints, as well as adjustable wind energy, where the wind power generations are variable at some range. Three objectives may be used for the second stage. They are the minimization of the generation cost, the minimization of system loss, and the minimization of the movement of generator output from the first stage generation plans. A modified IEEE 30-bus system, which contains the wind farm and storage device, is used for testing. The test results show the effectiveness of the proposed two stage smart grid economic dispatch approach.

关键词： Wind power generation Economics smart grids Wind farms Generators Minimization

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Fuzzy Comprehensive Evaluation for transmission grid Planning Based on Combination Weight

Fuzzy Comprehensive Evaluation for Transmission Grid Plannin...

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2014 International Conference on power and Energy(ICPE 2014)

作者： Z.H.LI Y Lin W.H.Chen D.H.You G.Wang M.L.Dong Q.R.Chen Y.Zou J.Hu Guangdong Power Grid Development Research Institute Co. Ltd State Key Laboratory of Advanced Electromagnetic Engineering and Technology of Huazhong University of Science and Technology

In order to remedy the defect that the determination of weight in fuzzy comprehensive evaluation is impacted by subjectivity, the combination weight is introduced. In this paper, the optimization Model combines the subjective weight and objective weight, which is solved by PSO, is built. At the same time, In order to give full consideration to the uncertain and fuzzy factors which involved in the grid planning, this paper combines the combination weight and fuzzy comprehensive evaluation to assess the grid-planning scheme. The calculation results of IEEE Garver-6 show that the proposed fuzzy comprehensive evaluation system is clear in theory and convenient to calculate, the combination weight is objective and reasonable as well as its results are scientific and intuitive.

关键词： grid planning scheme fuzzy comprehensive evaluation combination weight particle swarm optimization algorithm

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Experiment research on the technologies of heat treatment, recycling and regeneration of SF6 molecular sieve adsorbent

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Journal of Chemical and Pharmaceutical Research 2014年第7期6卷 2407-2413页

作者： Wang, Jingang Wei, Gang Chong, Junlong Gao, Can Wang, Jia State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing China State Grid Chongqing Electric Power Co. Maintenance Branch Company Chongqing China Student Union Chongqing Medical University Chongqing China

The recycling of SF6molecular sieve adsorbent used in high-voltage electrical equipment has favorable economic, social and environmental benefits in power sector. In this study, the methods for regeneration of SF6molecular sieve adsorbent were analyzed, proposing that heat treatment is the most economic and effective method, and the regenerating principles were illustrated. Moreover, experiment on heat treatment was made, by combining with infrared spectroscopy to analyze the change of content of the harmful elements in adsorbents, focusing on determination of the temperature and duration of regeneration by heat treatment of SF6 molecular sieve adsorbent and conducting adsorption isothermal curve test and verification to confirm the desorption capacity of the recycled SF6molecular sieve adsorbent. The experiment shows that for the KDHF-03-type molecular sieve adsorbent, which undergone heat treatment at temperature of 200 below for 2 hours, 50%-60% of the harmful decomposed gaseous products was removed, and its adsorption capacity was restored to 60% of the original. © 2014, Journal of Chemical and Pharmaceutical Research. All rights reserved.

关键词： Heat treatment

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A new strategy for optimal PMU placement based on limited exhaustive approach

A new strategy for optimal PMU placement based on limited ex...

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International Conference on power System technology (powerCON)

作者： Fei Zeng Hao Xu Daonong Zhang Xiaoyi Zhang Yubo Yuan Laboratory of Smart Grid Electric Power Research Institute of Jiangsu Electric Power Company Nanjing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology (HUST) Wuhan China WAMS & Time Synchronization Standards Working Group

This paper presents a new strategy for optimal PMU placement with an objective of observing the whole monitored system with minimum PMUs. An optimization tool, named as limited exhaustive approach (LEA), is proposed. The proposed LEA retains the inherent characteristic, being of high reliability, of exhaustive approach, and in the meanwhile has a searching space much smaller than exhaustive. An approximately optimal PMU placement (AOPP) is established in order to identify the searching space of LEA. The AOPP is a kind of PMU configurations, which can completely observe the whole monitored system, but probably needs to utilize a few more PMUs than the optimal PMU placement (OPP). Moreover the AOPP is deterministically obtained by detailed power system state observability analyses. Then the concept of bus neighbor (BN) is defined, and it will help to derive the searching space of LEA from the determined AOPP. Finally the proposed strategy for optimal PMU placement is successively tested on the IEEE 14-bus system and IEEE 39-bus system, and the simulation results confirm the effectiveness and superiority of the proposed strategy.

关键词： Phasor measurement units power systems Observability Monitoring Redundancy state estimation Voltage measurement

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Evaluation Model and Algorithm for Wind Farm Capacity Credit Considering Effect of Storage Systems Using the Bisection Method

Evaluation Model and Algorithm for Wind Farm Capacity Credit...

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IEEE power and Energy Society General Meeting

作者： Bo Hu Kaigui Xie Hejun Yang Zefu Jiang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing P.R. China Guizhou Power Grid Planning and Research Centre Guiyang P. R. China

Evaluating wind farm capacity credit is an important task in planning of power systems containing wind power. Utilization of energy storage devices can be used to smooth the power output curve of wind farms. The different configurations and control strategies of storage devices have different impacts on the power output curve and will significantly affect the capacity credit of wind farms. Based on the definition of wind farm capacity credit and the impacts of storage devices on the output power of wind farm, an evaluation model for wind farm capacity credit considering effect of storage device is presented, and an evaluating algorithm using the bisection method is developed for different storage strategies. The proposed model and algorithm were applied to the RBTS (Roy Billinton Test System) with addition of a wind farm to analyze the wind farm capacity credit. The study results show that the wind farm capacity credit can be improved by installing storage devices. The smoother the output power is, the higher the capacity credit. The study results also show the calculation of capacity credit closely depends on the selection of reliability index.

关键词： Wind farms Reliability Energy storage power system reliability Wind power generation Indexes

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Wsn gateways fault tolerance for surveillance transmission in smart grid communication

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Journal of Communications 2014年第9期9卷 680-686页

作者： Wang, Kaixuan Qiu, Xuesong Fu, Ning Yang, Haijian State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing100876 China Shanxi University of Finance and Economics Taiyuan030006 China Information and Communication Technology Service Center Smart Grid Electric Power Research Institute Beijing10076 China

Wireless sensors have attracted many researchers' attention because of their playing the very important role of smooth transition from the existing network to the smart grid. WSN (wireless sensor network) for surveillance of overhead transmission line is very promising for the efficiency as well as the economy. Meanwhile, it put some new challenges because of the No1 principle in the power utility design. Therefore, fault tolerance is of great importance in the monitoring the overhead transmission line. In this paper, we study the fault tolerance for the three types of faults. First, because of the two characteristics which are extracted from the applications, the novel network model is presented and it is used to explain the mechanism of the fault tolerance. Moreover, the quantitative analysis is proposed using the reliability depended on the features. The extensive experiments illustrate the effectiveness of our model and highlight some observations. © 2014 Engineering and technology Publishing.

关键词： Fault tolerance

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The study of a novel patch antenna sensor

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Sensors and Transducers 2014年第4期168卷 87-92页

作者： Lin, Chunyao Ou, Xiaobo Wu, Junfeng Wang, Youyuan Electric Power Research Institute of Guang Dong Power Grid Company No. 73 Meihua Road Yue Xiu District Guang ZhouGuang Dong China State Key Laboratory of Power Transmission Equipment and System Safety and New Technology No. 174 Sha Zhenjie Sha Pingba District Chongqing China

In order to improve the bandwidth of the traditional patch antenna, a new antenna sensor based on the U-slot antenna was designed in this paper. The electromagnetic simulation software Ansys-HFSS was used to analyze the impact of the antenna parameters, and short circuit loaded half U-slot antenna with a slot ground plane was designed at last. The main bandwidth of the antenna sensor ranges from 670 MHz to 839 MHz, while the dimension of the sensor is small enough. The size of the antenna patch is just 70×42 mm. Although the directivity of the antenna is not good enough, it can be used to detect the ultra high frequency electromagnetic signals emitted from partial discharge sources in the power transformers. © 2014. IFSA Publishing, S. L.

关键词： Microstrip antennas

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A fault ride-through control strategy for DFIG-based wind farm with VSC-HVDC grid-integration

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Dianli Xitong Zidonghua/Automation of Electric power Systems 2014年第23期38卷 13-21and39页

作者： Liao, Yong Wang, Guodong State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China State Grid Suzhou Electric Power Company Suzhou215004 China

In order to realize the fault ride-through operation of wind farms integrated to the grid through the voltage source converter based high voltage direct current (VSC-HVDC) transmission system, a mathematical model of the DFIG-based wind farm integrated to the grid through VSC-HVDC transmission system is developed with a DFIG-based wind farm as an example, and the characteristics of system disconnection under grid faults are analyzed. Then a fault override control block based on the power variation characteristics of voltage source converter on the wind farm side under a fault is designed for the wind farm to rapidly shed the load of the wind farm, while stabilizing the DC bus voltage. For the voltage source converter on the grid side, fault override control blocks are separately designed for the outside-loop DC voltage control and the inner-loop current control to increase the reactive power supply and alleviate the inrush current during the fault period, respectively. With the cooperation of these fault over-ride control strategies, the FRT capability for the wind farm integrated to the grid through VSC-HVDC transmission system can be effectively realized. Finally, simulations for a wind farm using the proposed FRT control strategy under different grid voltage sags and unbalanced faults are carried out on the MATLAB/Simulink platform. The simulation results and comparison analysis show that the proposed control strategy is correct and valid. ©, 2014 state grid Electric power Research Institute Press.

关键词： Wind farm

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