bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Quality Characteristics and Feasibility Analysis of Hail-proof Plastic Bagging of 5000 Mu in Gansu
Authors: Gou Xiaoping , Zhang Wanjun , Zhang Jingxuan , Zhang Jingyi , Zhang Jingyan
Published: March 2020

The effects of bagging of bare fruits, plastic bagging, hail-proof plastic bagging and bagging on the quality of red Fuji apples in different periods were studied. Red Fuji apples in Qingyang City of Gansu Province were used as test materials to determine the fruit quality indices of bagged and bagged apples in different periods, such as light consistency, color, and fruit firmness, total sugar, reducing sugar, sucrose and total acid. With the postponement of bagging period, apple fruit surface smoothness, color and hardness gradually decreased, while total sugar, reducing sugar and sucrose content gradually increased. With the delay of bagging time, the smoothness of apples decreases. Total sugars, reducing sugars and sucrose had the same growth and decline pattern as those of fruits without bagging, but their contents were always lower than those of the control. Hail-proof Apple plastic suction bagging has been proved by a lot of research and experiments that this kind of apple bagging has the characteristics of low price, fast bagging speed and reusability. It can also prevent and control diseases, insects, birds, rats, bees and other harmful effects on fruits and reduce fruit rust. It can also avoid friction between branches and leaves, prevent sunburn and reduce hail. At the same time, bagging efficiency is fast, improving work efficiency, reducing environmental pollution and reducing the workload of fruit growers.
Detection Technology of Aflatoxin Content Based on Smart Phone
Authors: Pan Zhengkun
Published: March 2020

Grain and agricultural products contaminated by AFTB1 have a strong carcinogenic effect that may damage people’s health. Rapid and effective screening of agricultural products contaminated by AFTB1 is an effective measure to ensure food safety and body health. This paper analyzes the fluorescence characteristics of AFTB1, and designs a smart phone detection system composed of portable optical device and smart phone detection software. The portable optical device uses ultraviolet light LED as an excitation source to excite fluorescence, and uses smart phone’s CMOS image sensor to collect fluorescence. It is convenient to connect with the CMOS image sensor with the help of portable optical device, thereby realizing image storage, processing and transfer of the observed object. The software developed for image acquisition and data processing on the smart phone can analyze and process the fluorescence image of AFTB1, obtain the fluorescence concentration of AFTB1 measured, and display the AFB1 content data, to achieve quantitative detection of AFB1.
Theoretical Calculation and Analysis of Coherent Interfacial Energy between B1-Type Carbides and FCC Iron Matrix
Authors: Jia Bin , Ma Hongru , Peng Yan
Published: March 2020

The valence electron structures (VES) of unit cells of the FCC iron matrix (γ) and B1-type carbides (ξ) in γ-Fe-M-C alloy systems (M=Nb, Ti, and V) were calculated using the empirical electron theory of solids and molecules (EET). Based on the results, the coherent interfacial energy between B1-type carbides and FCC iron matrix in γ-Fe-M-C alloy system was calculated and analyzed by combining EET and the discrete lattice plane-nearest neighbor broken bond (DLP-NNBB) method with covalent bond energy. The results showed that the solid solution strengthening effect was produced by the solute phase boundary segregation of the alloy elements at the γ/ξ interface, which enhanced the covalent bond network. The Nb alloy system had the largest segregation effect in γ-Fe-M-C alloy system. Moreover, the γ/ξ interfacial energy varies with different alloy elements over the range of 0.4-1.3 J/m2, and the γ-Fe-Nb-C alloy system has the largest coherent interfacial energy.The proposed theoretical method is consistent with the theoretical values calculated using other models, as well as empirical values. This indicates that the method proposed in this work is feasible for providing theoretical analysis and guidance.
Effect of Diameter Expansion Ratio on Recovery Properties of TiNiFe Alloy Pipe Coupling
Authors: Wang Xin , Li Yanfeng , Hui Songxiao , Ye Wenjun , Yu Yang , Song Xiaoyun , Liu Rui , Luo Yumeng
Published: March 2020

The reverse transformation temperature, recovery strain and pull-out force of TiNiFe alloy pipe couplings under different diameter expansion ratios (7%, 9%, 11%, 13%, 15%) were studied. The results show that the martensite reorientation occurs and the elastic strain energy released decreases with the increase of the expansion ratio, which leads to the increase of martensite reverse transformation temperature as’ and Af’. The recovery strain increases and the recovery rate decreases with the increase of expansion ratio. The expansion ratio of pipe couplings has a great influence on the pull-out force, which is related to the fit clearance and the diameter of the connected rod. When the fit clearance is the same, the larger the expansion ratio is, the greater the pull-out force is, and when the diameter of the connected rod is the same, the pull-out force decreases with the increase of the expansion ratio.
Effect of N2 Jet on Si Electrode Surface in Dielectric Barrier Discharge
Authors: Wang Changquan
Published: March 2020

In order to investigate the effect of discharge gas jet on electrode surface, some dielectric barrier discharge (DBD) experiments were carried out on a laboratory-built DBD system using monocrystalline silicon (Si) electrode in air with or without N2 jet. The effects of N2 jet on Si electrode surface are analyzed by means of field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectroscopy (EDS) attached to FESEM. The results show that Si electrode surface roughness and oxidation with N2 jet are increased more than without N2 jet. It can be used for texturing solar cells surface to improve power conversion efficiency.
A Reinforcement-Algorithm Framework for Automatic Model Selection
Authors: Shang Diya , Sun Hua , Zeng Qingliang
Published: March 2020

In recent years, with the development of artificial intelligence, how to realize the automation of machine learning has become a very popular research item. Among them, automatic model selection is an important part. For traditional machine learning, the part of the feature preprocessing, feature selection, model selection and so on are all needed manual processing, and they will take too much time and human resource, so automatic model selection is proposed to reduce resource waste. The automatic model selectionis based on the feature distribution of the data, and the model can be trained to obtain a model with better performance. This paper proposes an automatic model selection framework based on reinforcement learning. The framework can be divided into two phases, one is data preprocessing stage, which uses meta-learning to process; the other is model se lection framework, including feature preprocessing, feature selection and model selection. These three aspects will be the environment of reinforcement learning, through which a model with the highest accuracy can be chosen as the predictive model output. It has been proved by experiments that the method is effective.
Disturbance Observer-Based Path Following Control of Unmanned Surface Vessel with Control Input Saturation and Unknown Disturbance
Authors: Xie Yangliu , Luo Fuyu , Zeng Jiangfeng , Liang Xu , Guo Xiaoye
Published: March 2020

This study proposes a nonlinear disturbance observer-based path following control scheme for unmanned surface vessel (USV) in the presence of input saturation and unknown external disturbance. The dynamic surface control (DSC) framework is augmented by a robust adaptive radial basis function neural network (RBFNN) and a nonlinear disturbance observer (NDO). The control strategy can avoid the differential explosion problem inherent from traditional backstepping approach. The boundary value of the estimated disturbances that are presented in a number of existing disturbance observers is relaxed.
Overview of Collaborative Filtering Recommendation Algorithms
Authors: Zhang Zhen , Peng Taile , Shen Ke
Published: March 2020

In this paper, the key technologies of collaborative filtering recommendation algorithm and the bottleneck in its development are summarized, the problems of different technologies are analyzed. Besides, the application prospect of collaborative filtering technology is prospected.
Numerical Simulation Study on Progressive Extrusion Forming Process of Clutch Hub Gear
Authors: Jia Yangyang , Kou Shuqing , Yan Yifan
Published: March 2020

The extrusion forming process of the clutch hub gear with uneven thickness and small fillet is studied. The numerical simulation is used to analyse the thinning process of the hub gear and the filling of the small fillet. The results show that progressive extrusion has lots of advantages in contrast to conventional one step extrusion in improving metal flow and deformation uniformity, reducing forming load, improving fillet filling and forming quality.
Research on Thermal Endurance Properties of XLPE Aged in Different Media
Authors: Lv Hong , Yang Kunpeng , Xiao Xiang , Kuang Guowen , Yu Shihu , Kang Hongwei , Jin Haiyun
Published: March 2020

In this paper, XLPE samples were placed in air and silicone oil for thermal aging, respectively. Besides, the samples were tested by differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). Then the thermal endurance properties of XLPE were also investigated. The results show that the variation of the thermal endurance properties of XLPE with aging time was highly related to the content of antioxidants in the samples. When the content of antioxidants was above the critical value, the melting temperature and initial decomposition temperature of XLPE just drop slightly and the variation of the melting temperature and initial decomposition temperature is irrelevant to the heating media. In contrast, when the content of antioxidants was below the critical value, the melting temperature and initial decomposition temperature of XLPE aged in air would drop sharply. In addition, when the samples are aged in silicone oil for a long but limited time, the variation of thermal endurance properties is close to the results of running cables.
System development and structure analysis of intelligent material handling robot
Authors: Li Yiqiang , Zhen Rui , Lu Weizi , Wang Shixin , Feng Yiran
Published: March 2020

This paper analyzes the current popular machine vision modules and various manipulator in the market. It independently realizes the reading of two-dimensional code information, the recognition of material color and shape, and the intelligent grasping system of grasping. By screening the existing commercial motors and the whole positioning system composed of orthogonal encoder and all-directions wheel, it realizes the positioning and moving system that can plan the path autonomously. It realizes self-reading information, identifying, grabbing and stacking materials through the combination of the above systems. This paper uses MATLAB software to calculate and adjust the positioning speed and position, and carries out the overall design and three-dimensional modeling of the robot for the above modules, and it performs static load analysis on the main components of the robot through the Solidworks Simulation module, and performs simulation experiments. After summarizing the function integration of the robot, the author puts forward the application of scenario hypothesis, proposes the application promotion scope for this scenario hypothesis, and conducts the simulation experiment. The results show that the robot is simple in design, easy to implement and conduct mass production, and it is practical and reliable, and has good positioning, grabbing and recognition effects. It can be widely promoted in the field of automation.
Compression and Enhancement of Multiscale Vibration Signals Based on Φ-OTDR
Authors: Zhang Yue , Wang Song , Hu Yanzhu
Published: March 2020

Phase optical time domain reflection (Φ-OTDR) is a distributed optical fiber sensing technology. Its output data contains amplitude, time and other information, so it can accurately reflect various abnormal events. However, due to the high sampling frequency and the large number of sampling points, the amount of data of the vibration signal outputted by it is huge. In order to facilitate the analysis of signal features and optimize the storage space of data, this paper combines Fast Fourier Transform and multi-scale detail enhancement to enhance the vibration signal features while realizing the vibration signal compression.
Research on Noise Reduction of Φ-OTDR Signal Based on Blind Source Separation Algorithm
Authors: Zhang Yue , Wang Song , Hu Yanzhu
Published: March 2020

Optical fiber sensing has become an important means of health and safety monitoring of large buildings and facilities due to its better sensing characteristics. Undesirable noise signals are inevitably generated during actual sensor data acquisition. This paper focuses on the noise reduction processing of optical fiber Φ-OTDR vibration signal. Firstly, the acquired signal is preprocessed with data, then the data is independently correlated, and finally the FastICA algorithm in blind source separation is used to filter the noise signal. In this paper, the traditional wavelet transform algorithm is compared to reduce noise. The experimental results show that the blind source separation algorithm has better separation effect on fiber vibration signals.
The Design and Research of High-Rise Building Reinforced Concrete Structure Based on BIM
Authors: Sun Kaike , Ni Xiaowen , Liu Peng , Dong Shijuan
Published: March 2020

In recent years, the application of BIM technology for the AEC field in China is in the ascendant, the theory and application research continue to deepen, and the standard compilation work is carried out in an all-round way. Promoting the application of BIM has become the consensus and unified action of the government, industry and enterprises. The structure stability of the surrounding has been a practical problem in high-rise building concrete structure, and then conduct an analysis of the detailed model. The evolution process of design model has been clear through the analysis of the data model, at the same time, through the research of detailed the design process has established the model of business architecture, clear the orientation and function of the structure design BIM model. At the same time, the business structure of the model is established through the study of detailed design process, and the positioning and role of BIM model in detailed design of structure is clarified. On this basis, the detailed design software was developed combined with China’s reinforced concrete structure design standards and structure atlas.
Study on Corrosion Resistance of Pulse Laser Welded Joints of Hastelloy C-276
Authors: Wang Ying , Du Lei , Liu Dawei , Xu Desheng
Published: March 2020

Laser welding is an ideal method to join hastelloy C-276 for the good characters. Presently, there are few studies on corrosion resistance of the weld joint of hatselloy C-276. The corrosion resistance of hastelloy C-276 pulse laser welded joints was studied in this paper. The results of the electrochemical testing both in neutral and acidic solution show that the corrosion resistance of the weld is better than the base metal. The microstructure was analyzed by using SEM, EDS and XRD, it is found that the grain of the weld obviously is refined and the size reduces to 2-5μm, which is benefit to the corrosion resistance, and slight micro-segregation of Mo occurs and no second phase formation in the weld which has little effect on the corrosion resistance. The change of the microstructure makes it that the corrosion resistance of the weld is superior to that of the base metal.
Degradation of Humic Acid by Ferrous Ion Activated Persulfate
Authors: Zhang Qinqin , He Xu , Ding Shimin , Feng Xianghua , Yu Youqing
Published: March 2020

The persulfate anions (S2O8
2™) can be activated by Fe2+ to produce sulfate radicals (·SO4
−) and hydroxyl radicals (·OH), which can oxidize organic compounds rapidly. Humic acid (HA) is widely found in nature and is the main limiting factor for high-concentration wastewater discharge. In this study, HA was treated by Fe2+/S2O8
2™ system, the effects of initial pH, concentrations of Fe2+, persulfate (PS), and HA on the removal efficiencies of HA and E3/E4 were discussed. Besides UV254 and UV280, we found that UV250, UV270, UV300, UV365, UV400, UV436 and UV465 can effectively quantified the concentrations of HA, providing more HA characterization methods. When the initial pH was 3.0, the concentrations of PS and Fe2+ were 100 mmol/L and 20 mmol/L, respectively, the removal efficiency of HA reached 72% after 5 minutes, indicating that PS/Fe2+ effectively degrade HA, and E3/E4 increased from 2.6 to 5.75, suggesting the molecular weight and aromaticity of HA decreased. The removal efficiencies of HA increased as the concentrations of Fe2+ and PS increased, while the removal efficiencies of HA decreased as the initial concentration of HA increased. The addition of hydroxylamine hydrochloride (HAH) in Fe2+/S2O8
2™ system, could effectively promoted the Fe3+/Fe2+ circulation and reduced the accumulation of Fe3+, and strengthened the removal efficiency of HA. The research results indicate that Fe2+/S2O8
2™ oxidation is a promising technique for the treatment of HA in wastewater.
Breast Tumors Multi-classification Study Based on Histopathological Images with Radiomics Approach
Authors: Zhao Shuang , Wei Guohui , Ma Zhiqing , Zhao Wenhua
Published: March 2020

Breast cancer is the most common malignant tumor in women. It has important clinical significance for the automatic classification of breast tumors, and the current research mainly focuses on the benign and malignant classification of breast tumors. In this paper, we proposed a radiomics method for multi-classification of breast cancer. By the radiomics method, 212 features were extracted for quantifying breast tumor images’ intensity, color and texture and a multi-classification diagnosis model of breast tumors was constructed by support vector machines (SVM). The breast tumors were divided into eight categories, these eight categories include adenosis, fibroadenoma, phyllodes tumor, tubular adenoma, ductal carcinoma, lobular carcinoma, mucinous carcinoma, and papillary carcinoma. Final, the classification accuracy reached 90.3%. The radiomics approach provides an auxiliary role for developing the best treatment plan for breast tumors.
Determination of Arctiin in Fengre Ganmao Granules by Capillary Electrophoresis
Authors: Zhao Meili , Liu Haixing , Zhang Zongbao , Wang Lintong
Published: March 2020

This paper investigated the determination of arctiin content in Fengre Ganmao granules by high performance capillary electrophoresis (HPCE) method. The borax solution of 37.5 mmol concentration containing 12.5% methanol was chosen as buffer solution. The experiment was performed at a constant voltage of 16 kV and UV detection wavelength of 277 nm. The content of arctiin in Fengre Ganmao granules was 10.307mg/g (RSD=5.8%) (n=6). The recovery was in the range of 90.5%-115.1% (n=5). This method is suitable for the detection of the content of arctiin in Fengre Ganmao granules.
Modeling and Simulation of Multi-Material Soldering Performance for Spacecraft
Authors: Zhang Bin , Wang Dongmei , You Yiliang , Liu Wei , Zhao Shuping , Zhao Peirong
Published: March 2020

In recent years, there have been several on-orbit failure cases of spacecraft thermistor circuit. Through the analysis of failure mode, it is confirmed that the failures are mostly caused by the failure of wire solder joint. In this paper, the finite element method (FEM) is used to simulate the effects of different soldering parameters on the stress-strain characteristics of spacecraft solder joints in cold-hot alternating environment.
Design and Implementation of Wireless Transmission System Based on Zedboardand AD9361
Authors: Cai Wenjun , Wang Guofu , Ye Jincai
Published: March 2020

With the development and application of software radio technology, WLAN communication protocol shows great advantages. This design uses Zedboardsystem board and AD9361 radio frequency board to build software radio platform, designs a point-to-point wireless transmission system based on COFDM. The experimental results show that the system can transmit data stably.
Effect of Dielectric Parameters and Frequency on Temperature Field of Microwave Curing of rubber compound
Authors: Ye Ruzhou
Published: March 2020

This paper aims to predict the heating behavior of rubber samples based on finite element methods using comsol multiphysics software. The effects of frequency and dielectric parameters on the temperature distribution of the stratified and non-layered models were investigated. The dielectric parameters mainly affect the temperature of the temperature field, and the influence on the temperature field distribution is relatively small. The temperature state of the tire surface distributed by different frequencies is not exactly the same. When further studying the influence of frequency on temperature distribution, the combined frequency of 915+2450MHz is selected in the double-waveguide cavity model, and the temperature field distribution is optimal. The power selected at this time is 1000w+1000w. The average temperature of the layered model is higher than that of the non-layered model, and the temperature difference is larger. The research results can provide reference for the research of heating rubber composites in microwave heating systems.
Gallbladder-warming Decoction with Bupleurum and Scutellaria inhibits Anxiety and Depression of Rats
Authors: Sun Ning , Ren Yumei , Wang Mingyu , Miao Xinyan , Meng Zhiyong , Wang Chaobo , Yuan Xiaolong , Wang Liang , Fu Chen , Zhang Weiguang , Zhang Donghan , Cheng Ran , Wang Pengyu , Yang Hao , Qi Binbin , Li Yuzhu , Cai Ruijuan , Li Xiaobing
Published: March 2020

Objectives: To search the behavioral effect of Gallbladder-warming Decoction with Bupleurum and Scutellaria (GWBS) on anxiety and depression model rats and explore its mechanism. Methods: Twenty SD rats were randomly divided into four groups with 5 in each group: blank control group, model group, weastern medicine group and GWBS group. The unpredictable chronic emotional stress method was used to induce anxiety and depression of model rats. Rats in weastern medicine group were given diazepam at 0.26 mg/kg/d and the 5 rats in GWBS group were given GWBS at 11.5g/kg/d, otherwise, the other two groups were given the same volume of normal saline once a day. The experiment lasted for 10 days, during which the general state including body weight, hair color, activity level and so on were observed and the data were recorded. The results of sucrose consumption test and the light-dark box test were also recorded during the ten days. After the experiment, the changes of histological pathologic in the hippocampus were examined, and the γ-aminobutyric acid concentration of the rat hippocampus was detected using ELISA kit. Results: Pathological results indicated that GWBS improved pyramidal cells in hippocampus keeping the disordered arrangement. In comparison of the model group, the body weights of the weastern medicine group and the GWBS group apparently increased. Besides, the retention time of the light box was significantly prolonged and the concentrations of γ-aminobutyric acid in the hippocampus were significantly promoted in the two groups. The differences above were with statistical significance (P<0.05). In addition, the sucrose consumption values were improved markedly. Conclusion: GWBS, the agent of relieving the depressed liver and resolving phlegm, makes a difference in treatment of anxiety and depression rats and its mechanism may be related to the increase of GABA concentration in hippocampus.
The Variance Analysis and Friedman Check of Randomized Block Design for Motor additive
Authors: Gao Huameng , Yang Fan , Wang Hechao , Wang Wenxiu
Published: March 2020

In order to research the significancy level and difference in different motor assistant’s oil saving, the randomized block test design is introduced. The two stage cross-over design is explained. The two stage cross-over design was realized using SAS and the test data were gained. The test data was analyzed using variance analysis. The oil saving level and sample difference are gained. The study in this paper can be adopted in other fields of test design and data analysis.
Research on Spread Spectrum Multi-Target Diversity and Tracking Technology
Authors: Su Yonghe , Yuan Binwen , Zhang Di
Published: March 2020

In recent years, the survey ship has undertaken many key measurement and control tasks for multiple satellites. At present, single stations can only self-track a single target. In the mission, signals caused by factors such as occlusion or interference into the interference area are often encountered. Fluctuation, flashing, interruption, etc., so this paper proposes a method for tracking multi-target diversity into a tracking research method, which effectively responds to the influence of single target signal changes on tracking, and will be of great significance for multi-target spread spectrum measurement and control tasks.
Finite element Simulation of damped Sound Insulation Plate based on COMSOL
Authors: Chen Wei , Hu Sheng , Cao Hao , Huang Tao , Wu Xiaowen , Lu Ling , Peng Jiwen
Published: March 2020

In this paper, based on the acoustic impedance tube model established by COMSOL, we studied the influence of the boundary conditions on the frequency characteristics of the damping acoustic plate, the effect of the thickness of the damping layer on the single-layer and double-layer sandwich structure damping acoustic plate. Based on the simulation results, two conclusions can be obtained: (1) the damping layer can effectively increase the sound insulation of the sound insulation plate, and when the thickness of the damping layer is 2∼3 times of the bottom plate thickness, the performance-price ratio is the highest; (2) the sound insulation characteristics of the damping sound insulation plate follow the law of mass, and the sound insulation increases with the increase of frequency under the free boundary condition, while under the fixed support boundary condition, the low frequency sound insulation is larger.
Design of Polyethylene Ventilation Pipeline Leakage Monitoring System Based on Fusion of Multiple Signal Sources
Authors: Zhang Yingchun , Shi Jian
Published: March 2020

Due to the limitation of working conditions and working environment, polyethylene ventilation pipeline leakage monitoring system in an underground laboratory is facing the technical difficulties of low working pressure, large diameter and low leakage signal intensity. In order to prevent radon entering the fresh air system and ensure the safe operation of the fresh air system effectively, a monitoring method combining multi-signal sources, such as sound waves inside and outside the pipeline, is proposed in the design of PE ventilating pipeline leakage monitoring system, which can further improve the detection sensitivity, positioning error, reaction time and data management of the system.
Dynanic Simulation of Helical Gears with Crack Propagating In to Gear Body*
Authors: Jiang Hanjun , Liu Fuhao , Wang Manlin
Published: March 2020

The change of mesh stiffness induced by tooth crack will change the vibration characteristic of gear system. In this paper, an analytical model is proposed to investigate the helical gear mesh stiffness with tooth crack propagating into gear body. The developed model is validated by comparison with the FEA method. Hereafter, the mesh stiffness of helical gears with different crack depths is obtained and the effect of the crack depth on the mesh stiffness is studied. Afterwards, a 6 DOF helical gear dynamic model is established and the effects of crack depth on the dynamic response are investigated. The results indicated that the mesh stiffness of the helical gears reduced significantly with the present of tooth crack, the amplitude of periodical impulses increased as the crack depth increased, the rotate frequency and its harmonic frequencies are sensitive to the tooth crack.
The Role of Doubly-fed Motor with Low Voltage Ride Through by Controlling Converter in Wind Power Generation
Authors: Ni Mengxian
Published: March 2020

To improve the performance of the doubly-fed wind power converter system, according to the doubly-fed wind turbine system and its mathematical model, a vector control based on doubly-fed wind power converter control strategy and the rotor side stator flux linkage attenuation in the grid voltage drop of the doubly-fed wind power system are proposed. MATLAB/Simulink software is used to simulate different voltage sags and to compare and analyze the changes of stator flux and zero-sequence current between original control and stator flux attenuation control based on rotor side. It is found that when the grid voltage drops by 20%, the impact on the system is small, and when it falls to 80%, it would cause huge damage to the converter. And compared with the original control, the low voltage crossing control based on stator flux attenuation on the rotor side can restore the stable running state of the system more quickly. The results show that the stator flux decay control based on rotor side can make the doubly-fed wind machine transit the process quickly and reach a stable state, which lays a foundation for better control of power grid and reactive power support. The results of this study are intended to provide a basis for the control strategy of the converter in the doubly-fed wind power generation system and the stable operation of the system.
Performance Analysis and Optimization Research of Wind Power Forecasting System
Authors: Xing Xinyue
Published: March 2020

The power fluctuation of wind farm will affect the operation of regional power grid, mainly due to the power fluctuation caused by voltage fluctuation. In order to submit information to power dispatching department as soon as possible, it is convenient for system dispatching. It is necessary to research and develop wind power forecasting technology, especially ultra-short term wind power forecasting technology. At present, the power forecasting system of the dispatching side and some wind farms in China has been widely used. However, the system has some shortcomings in stable operation. Combined with the actual production experience of the existing wind power prediction system, analyze the performance of the existing wind power prediction system, find out the problems that affect the smooth operation of the system, and refer to domestic and foreign data to provide targeted information for each problem. Finally, some constructive optimization Suggestions and a set of optimization scheme are given. In addition, according to the final proposed solution, this paper also developed an optimization model for wind power prediction system, and compared the changes in system performance before and after optimization to verify whether the optimization plan is correct.
Research on the Calculation Method of Regional Grid Construction Efficiency and Power Demand under the Background of High Power Grid Complexity
Authors: Zhang Yan , Zuo Ya , Li Xiangping , Fan Pengfei , Fang Shaoxiong , Zhu Zelei
Published: March 2020

With the gradual development of power grid, the characteristics of power grid, such as regionalization, multi-dimensional and network complexity, have become more and more obvious. At the same time, the new round of power system reform has higher requirements for the development of power grid in all aspects. One of the key points of the reform is to achieve accurate investment in power grid, improve the efficiency of power grid construction and meet the demand of power grid construction. In this paper, the classic Analytic Hierarchy Process (AHP) is used, combined with the development situation of the power grid under the new requirements, the index system and model for the calculation of the construction efficiency and demand of the local and municipal power grid under the background of the highly complex development of the power grid are put forward. The model takes the time line of the power grid construction as the axis, through the pre-evaluation and post-evaluation of the power grid construction, the calculation of the construction situation of the regional power grid is completed. The efficiency and demand of power grid construction in different cities are analyzed. The example shows that the model can effectively identify the construction attributes of each region, reflect the construction requirements of the provincial power company system through different judgment matrix, and verify the final calculation results, optimize the construction and demand of the power grid system. The model effectively improves the operation efficiency of the power grid system, and realizes the ultimate goal of energy conservation and emission reduction.
Power Supply Reliability Assessment of Distribution Network Considering by Operation, Maintenance and Repair
Authors: Xu Lin , Teng Yufei , Chen Gang , Liu Chang , Yang Hua
Published: March 2020

In order to realize automation and intelligence of power system, it is essential to improve the power supply reliability assessment of distribution network. A comprehensive evaluation system for the reliability was proposed in the paper. An overall index system was integrated to introduce the criteria of the operation, maintenance and repair, which are important for the reliability. Entropy weight method and fuzzy TOPSIS method were combined to propose the evaluation model. Empirical analysis was implemented to verify the practicality of the evaluation system.
Review on the Wireless Power Transfer for the Application of Electric Vehicle
Authors: Gan Yanfen
Published: March 2020

Wireless power transfer (WPT) technique will become a hot development trend of the energy supply system for electric vehicles (EV). Compared with plug-in hybrid electrical charging systems, WPT has superior characteristics in small size battery, lightweight, short charging time (charging-in-motion services), and long driving range, etc. This paper mainly introduces the basic frame and the classification of the WPT system and then reviews the basic principles of popular WPT technique, named electromagnetic resonant coupling transfer (ERCT) brief. The basic components of the ERCT, coil, compensation topology, power electronics converters and control methods are given a brief introduction. The real-world applications are shown through examples that the WPT system is feasible, but also meet unsolved problems or difficulties. At last, some superficial improved is presented.
Redundancy Mechanism of Software System and Reliability Analysis
Authors: Yin Chunlin , Fang Zhengyun , Zhao Na
Published: March 2020

In the design and development of software systems, redundancy mechanism is a technique that improves the reliability of a system. Therefore, the mechanism of redundant processing of core modules in a module-based software system was proposed in this study on the basis of the analysis of the structural redundancy of a software system and its impact on reliability. This mechanism includes a dual-module redundancy structure of a single module and a dual-module redundant structure of combined modules; fault detection and judgment method was also presented. Simultaneously, the reliability of the system is analyzed on the basis of various redundant structures.
Coupling characteristics of lightning impulsive current on the underground coaxial cables
Authors: Jiao Xue , Zhang Qilin , Xing Hongyan , Zhou Junchi
Published: March 2020

In this work, we analyzed the influence of lightning electromagnetic impulses on the underground coaxial cables through environmental simulation and got such conclusions. 1) The coupling voltage is proportional to the length of the underground coaxial cable. 2) The coupling voltage is inversely proportional to the depth of the underground coaxial cable. 3) The coupling voltage is proportional to the value of the impulsive voltage. These discoveries are of great application value for lightning protection techniques of coaxial cables.
Energy Consumption Analysis of Deep Peak Regulation in a 300MW Plant With Subcritical Steam Drum Furnace
Authors: Liu Ke , Liu Jinbiao , Wang Haichao , Yang Xingsen , Wang Shouen , Hou Funjun , Hu Zhihong
Published: March 2020

Based on the operation and energy consumption calculation data of 300MW subcritical steam drum furnace in a plant, the energy consumption variation characteristics of the unit under various working conditions were analyzed. It was found that the coal consumption of the unit was about 40g/kWh higher than the rated load during low load peaking operation. The boiler efficiency was not significantly reduced during low-load operation, but the main and reheat steam temperatures were significantly reduced, resulting in a significant decrease in the efficiency of the high and medium pressure cylinders of the turbine. In addition, the analysis found that high auxiliary power consumption rate was also an important factor affecting low load energy consumption during low load operation.
Research on the Construction of Intelligent Meter Reading System Based on Energy Metering Integrated Acquisition Technology
Authors: Chen Gao , Zhongan Ding , Shian Zhan , Wuxiao Chen , Kunrong Ye
Published: March 2020

At present, the energy metering equipment used by Chinese residents mainly covers electricity meters, water meters, gas meters and heat meters, which are separately managed by different enterprises in the four energy industries. However, in addition to the power industry, the other three energy industries have not yet established enterprises that operate on a national basis, which poses a major challenge for the management of operations and management. The meter reading fee is difficult to become a major problem. To this end, the integrated measurement of electricity, water, gas and thermal energy has become an exploration of the State Grid focusing on resource intensive construction. Based on the research background, this paper establishes an energy metering integrated intelligent meter reading system. Based on the requirements of the system, the paper designs the functional structure, technical architecture system and operation management mode of the intelligent meter reading system. It is expected to realize electricity, water, and the gas and thermal energy measurement management system group standard design is based on the “Internet +” electricity, water, gas, and thermal energy measurement business operation mode, and establishes an integrated operation system for meter reading, charging, operation and maintenance, and service.
Low Voltage Distributed Photovoltaic Power Station Connected Estimation Model Based on Dispatch Automation System
Authors: Ma Dayan , Xie Xiangying , Chang Yan
Published: March 2020

A large number of distributed photovoltaic access grids pose great challenges to the safe and stable operation of the grid. In view of the fact that the dispatching automation system does not realize the real-time acquisition and monitoring of low-voltage distributed photovoltaic data, this paper proposes the station estimation method as an auxiliary means for real-time acquisition of low-voltage distributed photovoltaic power plants, and estimates the comprehensive low-voltage distributed photovoltaic power plants through appropriate algorithms. Access. Through case analysis, the deviation between the estimated value and the measured value is basically controlled within 8%, which proves the accuracy of the estimated model. This method is of great significance for the power dispatching department to strengthen the operation monitoring and statistical management of distributed photovoltaics, and to reasonably arrange the dispatching plan and coordinate the power supply.
Summary of Research on Quality Control Technology of Secondary Equipment Maintenance in Smart substation
Authors: Hong Meizi , Li Hengxuan , Xia Yongjun , Wang Zuowei , Du Zhen’an , Chen Hong , Chen Meiz
Published: March 2020

According to the characteristics of secondary equipment technology of smart substation, the maintenance work specifications and precautions of smart substation are reviewed. The performance inspection methods of various types of solo equipments were analyzed. By comparing each process of solo device specification and the test method of interval group function, the precautions of various aspects of the risk management and control of secondary equipment maintenance were summarized, and the overall principle of specification on secondary equipments of smart substation was proposed.
Research on the Application of Smart Site Management for Cross-regional Power Grid Project Based on the Basic Framework of Digital Power Grid
Authors: Sun Wencheng , Cheng Wentao , Peng Yuhui , Wang Hongjie , Liu Jianqiao , Zhang Haoyu , Wang Jian
Published: March 2020

In order to further improve the infrastructure management level of power grid projects and promote the fine management and scientific organization of power grid projects. Based on the basic framework of digital power grid, this paper uses UAV remote sensing, geographic information system, 3D virtual simulation, mobile Internet, Internet of things, intelligent sensor and other technical means to build a intelligent management and control platform integrating monitoring, early warning, command and emergency response. Exploring the application scenarios in terms of project schedule, quality, safety, special project, and on-site Internet of things perception. Practice shows that the construction of the platform can effectively improve the overall control of the power grid construction site and all kinds of information control level and risk prevention and control capabilities..
Research on Technology Economy Based on Centralized Gas Supply of Crop Fuel Energy
Authors: Li Zhiyuan , Lv Xing , Fu Chaosong
Published: March 2020

The crop fuel supply chain is the basic guarantee for the transformation of crop fuel resources, and it is the key to realizing the development and utilization of large-scale crop fuel energy in the future. This paper analyzes the technical issues related to crop fuels, and introduces the current status and existing problems of crop fuel harvesting, collection, storage, pretreatment and transportation. At the same time, it summarizes the technical economy of the supply chain, and compares the research methods that are often used in China. It is the main way of current research to establish energy-based gas supply by establishing quantitative technical and economic indicators. How to make full use of crop fuels and convert them into high-grade energy to meet the energy needs of farmers living and producing, and to promote the improvement of agro-ecological environment is of great significance.
Analysis of current characteristics of corona discharge in high voltage transmission
Authors: Wu Yong , Lei Lei , Zhang Jianhu , Ge Duode , Zhang Jun
Published: March 2020

In order to study the current characteristics of corona discharge in high voltage transmission, the time-domain characteristics and volt ampere characteristics of corona discharge under different high voltage are tested and analyzed. The actual test results show that: in the whole process of corona discharge, with the increase of inter electrode voltage, the frequency of pulse current increases, and the duration of current remains unchanged; negative corona discharge is more likely to occur, and with the increase of voltage, the average current growth rate is higher than positive corona discharge. Under the same interelectrode voltage, the negative corona current is stronger than the positive one. The nonlinearity of equivalent resistance between positive corona discharge electrodes is stronger than that of negative corona discharge.
Noise Characteristics of Distribution Power Transformers under Field Load Conditions
Authors: Wu Xiaowen , Hu Jingzhu , Zhu Lingyu , Yi Meisheng , Cao Hao , Lu Ling
Published: March 2020

In order to investigate the influence of load conditions on the noise characteristics of distribution power transformers, a platform in semi-anechoic room is designed for on-site transformer noise simulation. Transformer noises in balanced, unbalanced and harmonic load conditions are tested, respectively. The spectral distributions and A-weight sound pressure levels (SPLs) are compared to investigate the discrepancy caused by various load conditions. The result shows that the transformer noise is relevant with unbalanced load. Harmonic content is found to have obvious influence on the noise level of distribution power transformer. When harmonic load current is applied, the noise level of distribution power transformer increase obviously. The results can be referenced for the field noise and vibration control of distribution power transformers.
Longitudinal Protection Scheme of HVDC Line Based On the Characteristics of Branch Current
Authors: Xu Zhiming , Liu Jun , Bai Tianyu , Tang Wenqiao
Published: March 2020

For the traditional high-voltage direct current (HVDC) lines with poor protection rapidity and low resistance to high resistance, This paper puts forward a kind of based on HVDC line reactance flat wave branch current changes of the longitudinal protection scheme. This scheme takes advantage of the fact that the specific harmonic component of the flat-wave reactance branch current is short-circuited by the equivalent dc filter bank when it is internal fault. The characteristics of no such harmonic component flow on the branch can be used as the basis to identify internal fault and external fault. In other words, when it is internal fault, the component of the flat-wave reactance branch is close to 0; The component of the flat wave reactance branch is much larger than 0 when it is external fault. Simulation results show that HVDC longitudinal protection scheme based on branch current characteristics can quickly and accurately identify fault types in various situations and has a strong ability to withstand transition resistance.
Research on Risk Sharing Mechanism of Power Materials Project under Incomplete Contract Environment
Authors: Zhu Yunxiang , Xia Huali , Xu Zhenchao
Published: March 2020

Due to large capital investment and good economic benefits, power infrastructure projects are suitable for project financing. The repayment guarantee of project financing comes from the project itself rather than the guarantee provided by the guarantor. Therefore, the risk sharing mechanism in project financing is particularly important. This paper proposes that due to the existence of bounded rationality, transaction cost and information asymmetry, the contract of financing of power infrastructure projects is incomplete. According to this condition, the risk sharing mechanism between the actual investors of the project and the project loan bank is established; The asymmetry situation constructs a risk-sharing bargaining game model with incomplete information, calculates the respective risk-bearing ratios of both parties, and provides a basic conclusion for the future financing model of power infrastructure projects.
Application of Remote Wireless Sensor Network in Power System
Authors: Wang Hua , Yang Zijiang , Cong Yan , Xu Jing , Luan Wanchun
Published: March 2020

This paper mainly studies the design and research of remote wireless sensor networks. This system features low power consumption, strong anti-interference ability, large capacity, real-time acquisition, and safe and reliable data transmission. The research idea of this paper: The host connects up to 255 extensions through the wireless transmission module, and the host sends standard MODBUS (RTU) access commands to control the operation of each extension.