Applied Mechanics and Materials Vols. 236-237

Abstract: Nowadays, the high-speed economic development has caused significant consumption of energy. While the circumstance is getting severer, solar energy is taken as a kind of clean, environmental friendly resource with infinite storage that has aroused a wide public concern. Photovoltaic and solar thermal are two main categories of solar applications. Because of its high conversion efficiency, low emission and flexible installation, dish Stirling solar power technology is more preferable to be used among the solar thermal area. From the view of practical engineering application, this paper illustrates multiple focusing methods of the current dish Stirling solar power systems in detail, and the comparison of these methods are given to analyze their advantages, disadvantages and their application scenarios. It can be used for the future development of dish Stirling solar power technology and applied as a reference for large dish solar thermal power plants’ installations and tests.

Abstract: Randomness and volatility of wind power, the accepted capacity of wind power (ACWP) will become the wind power planning early first thing to consider with the increasement of the scale of wind power in grid. In this paper, we studied the correlation between wind power output and the change of daily load. The ACWP were analysis based on the power load characteristics, peak-valley difference of the Gansu Power Grid and power balance. The maximum installed capacity of wind power integrated of the five typical operating mode in 2011 is given. It is pointed out that ACWP is less than the planned capacity. At last, the specific measures to increase the ACWP are proposed.

Abstract: According to forced power oscillation theory, the opening of flow guide vane varies dramatically, when governor system occurs oscillation. At serious condition, prime mover’s output is affected, consequently the power system loses stability. Constructing generator and governor system modal, and then discussing the transfer function of each part, the statement indicates that dynamic characteristic can be rectified though phase compensation. as result the stability and dynamics characteristic of power system is also enhanced. Building a single-machine infinite-bus simulation model based on MATLAB, results verify the correctness of the theory analysis.

Abstract: A copolymer of 4-(1H-pyrrol-1-yl)phenol (PLPY) and pyrrole ( P(PLPY-co-Py) )was synthesized. And the chemical structure and battery performance of the prepared materials were characterized comparably by 1H NMR, FT-IR spectra and galvanostatic charge-discharge testing using simulant lithium ion half-cell method, respectively. The results shows that the introduction of the phenol group to the pyrrole as a rigid side chain could prevent the polymer from agglomeration and optimize the particle morphology of the resulting polymers, all of which made it demonstrate a significantly improved specific capacity (73.9 mAh•g-1) compared with PPy (21.4 mAh•g-1)

Abstract: A simple and rapid technique to synthesize LiFePO4 by microwave-solvothermal method assisted a short time post-treatment was described. The crystal structure and the charge-discharge performance of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge testing. The results indicated that this rapid synthesis technique by microwave-solvothermal method combined short time post-treatment was an effective way to obtain LiFePO4 with a single olivine-type crystal structure and small particle size. The electrochemical research indicated that the resulting LiFePO4/C composite could deliver 141.7mAh•g-1 at 0.1C at 25 °C and showed good stability retaining 97% after 45 cycles.

Abstract: This paper analyzes the importance of the wind farm wind speed prediction, as well as the different forecasting methods in various fields. And established the RBF neural network forecasting model can forecast one hour ahead of the wind farm wind speed, and the results meet the actual forecast requirements. By reconstructing the wind speed time series, wind speed can be predicted one day in advance, the prediction accuracy and one hour ahead of forecast accuracy is similar. The method can predict a longer period of time the wind speed, and provide important reference for the wind farm power generation scheduling.

Abstract: Analyzed the reaction between slag and liquid iron and done a lot of experiments in the Lab to find the effect of many factors. It shown that putting into CaO to low the reaction activity with small amount of calcium oxide added, it can make the expansion in reaction to be inhibited, and improve the content of CaO in further. Silicate is high melting point material in the reaction product. After the reaction it reduce the slag fluidity to the slag with addition of CaF2, which can further improve the effect of reduction reaction.

Abstract: In the paper, the reaction of solid-solid model was researched and we confirmed the reaction equation. The experiments in the lab shown that the t1/2 is 11.8min in the ferrosilicon reduction boron anhydride reaction at low temperature. The yield of boron is higher by direct reduction method smelting. In the boron oxide reducing experiment, the yield minimum is 76%, the maximum is 82%, and the average value is about 79%, which provides favorable foundation conditions for smelting amorphous mother alloy.

Abstract: Based on the phase diagrams analysis, the activity model of Fe-C-B ternary system was established with the ion and molecule coexistence theory. The activities of Fe, C, B, Fe3C, FeB, FeB2 and B4C in melt were calculated by analyzing the model. We have researched the thermodynamic condition of boron oxide reducing with carbothermic method and analyzed the effects of CO partial pressure, B2O3 content and slag type for the lowest smelting temperature. In normal pressure, the carbon content is high in melt, so it needs 2000°C for decarbonizing and chrome remaining. When CO partial pressure is 0.1 kPa and CaO content is less 60%, the lowest temperature of smelting ferro boron could be below 1600°C.

Abstract: In video monitoring system of substation, in-process video inspection is used to detect abnormalities and provide corresponding solutions in a timely manner to avoid failures.As the common equipment，electric power tower’s inclination should be detected timely..It was hard to check the fault of tower inclination timely and accurately only by staff’s routine inspection,and it will spent much manpower and material resources by the manner of sensor. A manner of substation video inspection tower inclination angle detection based on SIFT feature matching and OTSU was presented in this paper. The tower inclination angle was calculated through the matched feature points. As is proved in the simulation test, this algorithm features simplicity and it can detect the maximum angle in all case of inclination .