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Science China Technological Sciences 2013年第3期56卷 683-692页

作者： LIU Yi XIAO LiYe WANG HaiFeng dai shaotao QI ZhiPing Key Laboratory of Applied Superconductivity Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences The Queen's University of Belfast Belfast BT9 5AHUK

China is rich in solar and wind energy resources,of which the proportion of China’s power sources has been rapidly *** fluctuating and intermittent energy sources will bring significant challenges to the safe and stable operation power ***,making use of the spatiotemporal complementarities between different renewable energy resources is a feasible way to level fluctuating power especially when they have a widely geographical *** on the data provided by China Meteorological Administration(CMA),this research explores the spatiotemporal complementarities between wind and solar energy *** paper nondimensionalizes hourly wind speed and global solar radiation data and employs several indexes to compare the smoothing effect with various combining *** results show that combining wind and solar powers within a certain area can cause a fall of zero-power or very-full power ***,combining different resources improves ’smoothness’ in power output when compared with that from each individual ***,under hourly time scale,when the dispersion of sites is large enough,the smoothing effect of combining the dispersed wind power is very close to the combination of those two different ***,this complementary effect is much better than that of just combining solar energy resources.

关键词： wind energy solar energy complementarities renewable energy

Investigation on the spatiotemporal complementarity of wind energy resources in China

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Science China(Technological Sciences) 2012年第3期55卷 725-734页

作者： LIU Yi XIAO LiYe1,2 WANG HaiFeng LIN LiangZhen dai shaotao Key Laboratory of Applied Superconductivity Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China The Queen's University of Belfast Belfast BT95AHUK

Wind power resources are abundant in China,especially in northern China and eastern coastal areas of ***,wind energy has intermittent and unstable characteristics,which leads to random power output and limits the large-scale utilization of wind energy *** has been shown that geographically dispersed wind plants have obvious spatiotemporal offsetting *** output from each individual site exhibits the power ups and ***,when we simulate power lines connecting sites over a certain region,the output from them changes slowly and rarely reaches either very low or full *** using the spatiotemporal complementarity of wind resources effectively is highly beneficial to the smoothing of power *** paper investigates the spatiotemporal complementarity of wind resources in China based on the relevant data of wind energy resources,which are offered by China Meteorological Administration(CMA).

关键词： wind energy complementarity renewable energy

Design aspects of transmission voltage superconducting fault current limiters with YBCO tapes in China

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Superconductivity 2022年第4期4卷 51-61页

作者： Tao Ma shaotao dai Meng Song Jiamin Zhu Jing Zhang School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China Guangdong Power Grid and the Joint Laboratory of Superconducting Power TechnologyChina Southern Power GridGuangzhou 510080China Shanghai Superconducting Technology Co. Ltd.Shanghai 201203China

The design progress of superconducting fault current limiter(SFCL)for transmission voltage is presented,with a focus on the results of recent key experiments that have led to a state‐of‐the‐art high‐voltage high‐capacity super‐conducting current limiting techniques:the resistive alternating current(AC)SFCL,saturated iron cores AC SFCL,and resistive direct current(DC)*** main driving factors for designing SFCL in these projects are the preparation of high‐performance superconducting materials,the development of large‐scale superconducting current limiting winding,system testing,and operation *** on the authors’experience with both AC and DC SFCLs,this paper focuses on the main design aspects of resistive SFCL at transmission *** relationship between the hot spot caused by the inhomogeneity of long superconducting tape and the overall parameter selection is *** addition,the thermal calculation based on the current limiting resistance and a real‐time current curve is also proposed for the parameter design of the current limiting winding.

关键词： Superconducting fault current limiter Resistive type YBCO tape Current limiting Insulation Heat transfer

Synthesis,characterization,and thermostability of bis(2,2,6,6-tetramethyl-3,5-heptanedionato)copper(Ⅱ)

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Rare Metals 2012年第4期31卷 343-349页

作者： ZHANG Teng,GU Hongwei,DING Fazhu,QU Fei,and dai shaotao Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing China

Owing to the adaptability to large scale processing,excellent composition control and film uniformity,the metal-organic chemical vapor deposition（MOCVD） technique is a promising process for high-temperature superconductor YBa;Cu;O;（YBCO） *** this technique,the evaporation characteristics and thermostability of adopted precursors in whole process will decide the quality and reproducible results of YBCO *** the present report,bis（2,2,6,6-tetramethyl-3,5-heptanedionato）copper（II）(Cu（TMHD）;) was synthesized by the interaction of copper acetate hydrate with TMHD in methanol solution,and its structure was identified by FTIR,1 H NMR,and EI-MS ***,thermal property and the kinetics of decomposition were systematically investigated by nonisothermal thermogravimetric analysis methods（TGA） at different heating rates in streams of N;,and the average apparent activation energy of evaporation process was evaluated by the Ozawa,Kissinger,and Friedman *** possible conversion function was estimated through the Coats-Redfern method to characterize the evaporation patterns and followed a phase boundary reaction mechanism by the contracting area equation with average activation energy of 85.1 kJ·mol;.

关键词： Cu(TMHD)_2 metal-organic chemical vapor deposition(MOCVD) synthesis thermostability

Simulation of Discharge Plasma in Mid-frequency Pulsed DC Magnetron

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高电压技术 2013年第10期39卷 2526-2531页

作者： QIU Qingquan QU Fei GU Hongwei ZHANG Guomin dai shaotao Institute of Electrical Engineering Chinese Academy of Sciences Key Laboratory of Applied Superconductivity Beijing 100190 China

Pulsed magnetron sputtering in the mid-frequency range (5-350 kHz) has recently become a promising industrial technique for the deposition of high-quality films. In order to study the plasma properties in a pulsed DC magnetron, a two-dimensional self-consistent particle model is developed, and the temporal and spacial evolution of electrons and ions in discharge space are simulated. In these simulations, the magnetic field is calculated by finite element method, and the plasma is modeled by PIC/MCC (Particle-In-Cell, Monte Carlo Collision) method. The plasma density and the electric potential in the pulse-on and the pulse-off phases are preassigned, and then the temporal evolution of plasma close to the cathode and the substrate is analyzed. It is found that electrons accumulate close to the cathode in the pulse-off phase more than in the pulse-on phase, and hence the positive particles at the target are neutralized and the electric arc is suppressed. Moreover, more energetic ions accumulate close to the substrate. They bombard the film, and this enhances the film's quality.

关键词：放电等离子体脉冲磁控溅射脉冲直流模拟系统中频等离子体性能粒子模型等离子体密度

Synthesis, characterization and thermostability of tris(2,2,6,6-tetramethyl-3,5- heptanedionato)yttrium(Ⅲ)

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Journal of Rare Earths 2012年第10期30卷 1041-1047页

作者：张腾古宏伟丁发柱屈飞戴少涛 Key Laboratory of Applied Superconductivity Institute of Electrical EngineeringChinese Academy of Sciences

The metal-organic chemical vapor deposition （MOCVD） technique is a promising process for high temperature superconductor YBa2Cu3O7-δ （YBCO） preparation. In this technique, the purity, evaporation characteristics and thermostability of adopted precursors will de- cide the quality and reproducible results of YBCO film. In the present report, tris（2,2,6,6-tetramethyl-3,5-heptanedionato）yttrium（III）（Y（TMHD）3） was synthesized by the interaction of yttrium nitrate hydrate with TMHD in methanol solution, and its structure was identified by FTIR, 1H NMR, 13C NMR and EI-MS spectroscopy. Subsequently, the thermal property and the kinetics of decomposition were system- atically investigated by non-isothermal thermogravimetric analysis methods （TGA） at different heating rates in streams of N2, and the average apparent activation energy of evaporation process was evaluated by the Ozawa, Kissinger and Friedman methods. The possible conversion function was estimated through the Coats-Redfern method to characterize the evaporation patterns and followed a phase boundary reaction mechanism by the contracting area equation with average activation energy of 88.9 kJ/mol.

关键词： Y(TMHD)3 metal-organic chemical vapor deposition (MOCVD) synthesis thermostability rare earths

Synthesis, characterization and thermostability of barium β-diketonate with tetraethylenepentamine ligand

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Rare Metals 2012年第6期31卷 566-572页

作者： ZHANG Teng, GU Hongwei, DING Fazhu, QU Fei, and dai shaotao Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China 1. Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

The metal-organic chemical vapor deposition (MOCVD) technique is a promising process for high-temperature superconductor YBa2Cu3O7-δ(YBCO) preparation. In this technique, it is a challenge to obtain barium precursors with high volatility. In addition, the purity, evaporation characteristics and thermostability of adopted precursors in the whole process would decide the quality and reproducible results of YBCO film. In the present report, the barium precursor containing 2,2,6,6-tetramethylheptane-3,5-dionate and tetraethylenepentamine ligands (Ba(TMHD)-tetraen) was synthesized and identified by FTIR, 1H NMR, 13C NMR and ESI-MS spectroscopy. Subsequently the thermal property and the kinetics of decomposition were systematically investigated by combining non-isothermal thermogravimetric analysis methods (TGA), Ozawa, Kissinger and Friedman methods. On the basis of the apparent activation energy of the evaporation process, the thermostability and evaporation characteristics of the precursors were discussed. All results show that Ba(TMHD)-tetraen has higher volatility than Ba(TMHD)2, but it is unstable and highly sensitive to the change of temperature during the whole evaporation process. Therefore, it is very important to choose suitable volatilization technology and conditions for avoiding Ba(TMHD)-tetraen breakdown (or thermal aging) during the MOCVD process.

关键词： MOCVD barium precursor synthesis thermostability

The Optimization of Gray Model Applied to Super Short-term Load Forecasting

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The Optimization of Gray Model Applied to Super Short-term L...

Analysis on the hourly spatiotemporal complementarities between China's solar and wind energy resources spreading in a wide area

2010 3rd International Conference on Computer and Electrical Engineering(ICCEE 2010)

作者： Jiaxing Zhai shaotao dai Liye Xiao Institute of Electrical Engineering Chinese Academy of Sciences

Gray model theory is a widely used technique in load forecasting. However, there are some problems when classic gray model is used in super short-term load forecasting because of the theory itself and external factors. To solve these problems and improve forecasting accuracy, an improved gray model is introduced in this paper to be applied on super short-term electric load forecasting. In this improved model, original data is analyzed and processed. Inner structure is also optimized and residual correction is introduced. By computing the correlation of actual data and different prediction results, the best prediction program is chosen to obtain smaller errors and better results. The forecasting algorithm can estimate model parameters, meet the requirement of dynamic power load and overcome random disturbances. Example analysis and simulation show that the forecasting error is about 2 percent when used in super short-term load forecasting. Compared with conventional gray model methods, the proposed scheme has the characteristic of simple computation, high forecasting precision and good applicability.

关键词： super short-term electric load forecasting gray model parameter modification correlation analysis posteriori error checking residul correction.

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Chinese Science Bulletin 2013年第7期58卷 683-692页

China is rich in solar and wind energy resources,of which the proportion of China's power sources has been rapidly *** fluctuating and intermittent energy sources will bring significant challenges to the safe and stable operation power ***,making use of the spatiotemporal complementarities between different renewable energy resources is a feasible way to level fluctuating power especially when they have a widely geographical *** on the data provided by China Meteorological Administration(CMA),this research explores the spatiotemporal complementarities between wind and solar energy *** paper nondimensionalizes hourly wind speed and global solar radiation data and employs several indexes to compare the smoothing effect with various combining *** results show that combining wind and solar powers within a certain area can cause a fall of zero-power or very-full power ***,combining different resources improves 'smoothness' in power output when compared with that from each individual ***,under hourly time scale,when the dispersion of sites is large enough,the smoothing effect of combining the dispersed wind power is very close to the combination of those two different ***,this complementary effect is much better than that of just combining solar energy resources.

关键词：太阳能资源风能资源互补小时中国时空可再生能源资源面积

Development and test in grid of 630 kVA three-phase high temperature superconducting transformer

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Frontiers of Electrical and Electronic Engineering in China 2009年第1期4卷 104-113页

作者： Yinshun WANG Xiang ZHAO Junjie HAN Huidong LI Yin GUAN Qing BAO Xi XU shaotao dai Naihao SONG Fengyuan ZHANG Liangzhen LIN Liye XIAO Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100080China Technical Center of Tebian Electric Apparatus Stock Co. LtdChangji 831100China Beijing Key Laboratory of High Voltage and EMC School of Electrical and Electronic EngineeringNorth China Electric Power UniversityBeijing 102206China

A 630-kVA 10.5 kV/0.4 kV three-phase high temperature superconducting(HTS)power transformer was successfully developed and tested in a live *** windings were wound by hermetic stainless steelreinforced multi-filamentary Bi2223/Ag *** structures of primary windings are solenoid with insulation and cooling path among layers,and those of secondary windings consist of double-pancakes connected in *** cryostat is made from electrical insulating glass fiber reinforced plastics(GFRP)materials with room temperature bore for commercial amorphous alloy core with five *** are laid in the toroidal cryostat so that the amorphous core operates at room *** insulation technology of double-half wrapping up the Bi2223/Ag tape with Kapton film is used by a winding machine developed by the *** characteristics of the transformer are obtained by standard short-circuit and no-load tests,and it is shown that the transformer meets operating requirements in a live grid.

关键词： high temperature superconducting(HTS)transformer Bi2223/Ag tape amorphous alloy windings liquid nitrogen