bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Competitiveness of Incremental Distribution Market Based on Reliability Electricity Charge
Authors: Shen Yu , Lin Hongyang , Li Jinhu , Ma Hanbin , Chi Xie
Published: December 2019

With the maturity of the medium- and long-term trading market, the gradual start-up of the spot market and the full liberalization of the operating rights of the incremental distribution network, the power advantage capital has launched the trial of the incremental distribution network pilot, and how to carry out the market of the incremental distribution network. Chemical operations have become the focus of research in the market. Based on this, for the park-type incremental power distribution project, the basic module group that constitutes the typical power supply mode is analyzed and determined, and the influence of the key basic modules on the power supply reliability rate is studied, and the typical power supply mode of the park with different reliability levels is obtained. This paper studies the bidding strategy of power producers in the electricity market, introduces the game theory of electricity market, establishes a two-level bidding strategy model based on probability theory under incomplete information, and proposes a solution algorithm and framework for the mathematical model. The genetic algorithm is used to find the optimal quotation parameters.
Research on Evaluation Method of First-class City Distribution Network
Authors: Sun Qiang , Liu Xiang , Li Xiangdong , Lv Fang , Lv Jing
Published: December 2019

The first-class urban distribution network is the key content of our country’s current construction. In order to obtain accurate evaluation results, a first-class urban distribution network evaluation index system is constructed from four aspects of reliability, economy, low carbon and intelligence, and a decision-making method based on cloud model and probability analysis is pro-posed. The cloud model is used to express and process the linguistic evaluation information of qualitative attributes given by experts. The 3En criterion is utilized to convert the cloud model to the interval value, thereby reducing the impact of randomness on distribution network evaluation results. The probability method is used to process the interval value and obtain the comprehensive evaluation results. The proposed method can effectively solve the randomness and fuzziness of qualitative indicators in the evaluation process. Finally, the method is used to evaluate and sort 11 regional distribution networks in xi ‘an jurisdiction, and the effectiveness of the proposed method is demonstrated according to the actual situation.
Research and Design of Smart Grid Monitoring System Based on Cloud Computing
Authors: Yan Yuan
Published: December 2019

Real-time data of power system is an important data for power system equipment measurement and acquisition. These data are important basis for analyzing power system stability, predicting grid load and power equipment failure and aging, and are the data that must be monitored for grid operation. Aiming at the problem of massive monitoring data access and processing in smart grid monitoring system, this paper proposes a smart grid monitoring system based on cloud computing framework by comprehensively utilizing geographic information technology, network communication technology and distributed database technology. The system’s workflow is more efficient and reliable for information processing than traditional database models and existing methods.
Research on Implementation Method of Key Management Based on Data Encryption Technology
Authors: Yan Shi
Published: December 2019

Key management is a vital problem which must be solved when a database encryption system is designed and implemented. It is very difficult to solve key management. Key management is directly related to the performance of the whole encryption system and security of encrypted data. Key management is discussed by the author from the aspects of generation, distribution, storage, exchange and change. A concrete scheme of key management is proposed. The security of the scheme is discussed. The discussion result shows that it is a feasible key management scheme which can meet the security requirements of the database encryption system.
Design of patrol and control platform for power network based on UAV and VR
Authors: Hao Yanjun , Shi Weidong , Lei Ting , Yue Guoliang , Zhang Kun , Chen Mingxia
Published: December 2019

Since the beginning of the twenty-one th century, with the rapid development of China’s economy and the continuous progress of China’s power industry, it has contributed an indelible force to the development of China’s socialist undertakings The construction of power grid is very important to the development of society. The normal operation of the power grid can not be separated from regular inspection of power grid equipment and lines, so as to keep abreast of and understand the operation of power transmission lines and changes in the surrounding environment and Line Protection Areas Is the power supply enterprise a heavy daily work. Manual inspection is a traditional inspection method, but also the main way of transmission line inspection. Due to the complex terrain of the transmission line corridor, there are almost no patrol roads in some sections along the route in some harsh conditions such as river-crossing or high mountains and steep mountains. This patrol method has great labor intensity and difficult working conditions Transmission lines can not get timely feedback, and can not observe the real-time intuitive operation of lines and equipment. In this case, in response to the national “Internet +” strategic thinking, we initiated the “Internet +”, “UAV +” and “VR +” all-ecological power grid patrol mode Realize the power network equipment long-distance inspection, all-round inspection, real-time simulation inspection, inspection in bad environment, so that the cause of power inspection can take off.
Research on Two-stage Multi-objective Integer Programming Model of Helicopter Distribution Materials in Emergency Logistics
Authors: Guo Haiwang , Peng Chaojing
Published: December 2019

Based on the earthquake disaster, this paper introduces the JIT just-in-time thinking of logistics management, and builds a three-level supply chain network consisting of helicopters, warehouses and material demanders. On this basis, aiming at maximizing the seismic performance, radiation range and optimal helicopter dispatching plan of the material reserve, and establishing the warehouse location and material distribution as the decision variables, a two-stage multi-objective integer programming model is established. The feasibility and effectiveness of the model are verified by specific case analysis, and the efficiency and effect of material distribution in the earthquake disaster reduction system are improved. In addition, according to the actual earthquake disaster area, the model was improved by the ant colony optimization algorithm.
Automatic Storage System Based on Weight and Volume Measurement
Authors: Liu Bang , Ke Haisen
Published: December 2019

In order to cope with the current mixed production of small and mediumsized enterprises, the production mode with many styles and few quantities leads to the problems of low labor efficiency and easy to make mistakes. I put forward a research scheme of warehouse control system based on volume and weight measurement, which adopts automation technology and information technology. My research ideas are: from the volume, weight, the first is to transport goods on the conveyor belt; Goods through barcode scanner for information entry and statistics; Then the volume and weight are measured automatically. If the quantity is large and easy to distinguish, the goods will be transferred directly from the assembly line. If the quantity is small and difficult to distinguish and easy to make mistakes, the controller will assign the storage location and store it in the warehouse. Finally, manage the capacity of each location and manage the outbound.The experiment proves that it can save human resources, ensure operation efficiency and accuracy, reduce costs and improve the level of warehouse information and intelligence.
Research on Application of Private Cloud Platform
Authors: Bai Yongbin , Chen Xiaolong , Wang Quan , Sun Lingjie
Published: December 2019

This paper introduces the current development status of cloud computing technology at home and abroad, analyses the history and realistic needs of Enterprise Cloud computing, introduces the IaaS, PaaS and SaaS services in the construction of Enterprise Cloud Computing center, and puts forward seven key technologies of operation and development that need to be solved urgently at present.
Research about dynamic programming technology of Marine cloud-communication
Authors: Liao Sunmin
Published: December 2019

In order to meet the increasing requirements of marine data transmission with the exploitation of the ocean, a cloud-communication network structure suitable for marine communication, and its operation mode and design method are proposed through analysis of existing communication technologies. Firstly, the structure of the cloud communication network is designed. The controllers manage the satellite communication terminals (including communication objects and nodes) of the ships, offshore facilities and shore-based data centers through the cloud communication network. Then, based on the network structure, the corresponding operation mode is proposed, that is, the dynamic programming technology is used to centrally control the communication terminal, and multiple nodes are called to assist to form a “cloud channel” to coordinate the communication task. Finally, the two main points of channel dynamic programming technology are analyzed. One is to provide suitable communication coordination nodes for communication objects, and the other is to allocate the best communication channels. Aiming at the selection algorithm of cooperative nodes and communication channels, the design ideas and basic models of the algorithm are proposed, and the feasibility of channel dynamic programming is illustrated.
Research on Comprehensive Evaluation of Micro Energy Internet Based on Synergetic
Authors: Hu Mingtao , Dou Xun , Zhang Pan
Published: December 2019

Energy Internet is a product of the high integration of traditional energy system and Internet, which may break the existing energy landscape. The existing energy Internet assessment methods are lack of integrity and fail to fully reflect the core mechanisms and requirements of energy Internet. At the same time, the subjectivity of weight calculation is strong, which is easily influenced by human factors. Proceeding from the requirements of overall evaluation and focusing on the energy interconnection and complementary of micro energy Internet, this paper proposes a comprehensive evaluation indicator system of energy Internet based on the theory of Synergetics. The first-level indicator, which is the macro-performance of energy Internet, is put forward on the basis of the reference to traditional indicators and the energy interactive-collaborative in Synergetics. Secondary indicator is the subdivision of first-level indicator and represents the micro-elements that the first-level indicator fails to reflect. At the same time, the weight of each index is calculated by the principle of information entropy. Finally, Evaluation of Micro Energy Internet has guiding significance for the future construction of energy Internet.
Application and Research of Power Information Communication Technology in Smart Grid
Authors: Chen Peng , Chen Shiwen , Zhong Wei , Zhou Jinglin , Zhou Qizhi , Liang Chao , Fang Zeya , Wang Xiaobei
Published: December 2019

Under the background of intelligent power grid, the rational application of information and communication technology can fully improve the quality of construction and management within the system. In the era of smart grid, workers in related fields need to more clearly define the application characteristics of information and communication technologies, rationally plan the application of information and communication technologies in new energy fields, power transmission and distribution, and power consumption, and improve information and communication technologies. The application efficiency optimizes the modernization and development level of information and communication technology.
Briefly Introduction on Taxation from China to UK
Authors: Hong Wang
Published: December 2019

The research of corporate finance has already developed for a long period in China and UK. Corporate finance has been influenced by lots of factors during its development, such as government policies, company, staff and one of the most important factors is taxation. But there is still no one standard for the influence of taxation on corporate finance in theory area. According to the situation in both China and UK, the research of the influence of taxation on corporate finance need more time and more practices to complete. The study of this paper tries to examine the influence of different taxation on corporate finance in China and UK by mainly introduce their corporate finance problems under their taxation and to find some trends. Finally, some conclusions and recommendations will be given.
Analysis and Research on Life Prediction System of Intelligent Energy Meter
Authors: Li Ning , Yang Jincheng , Han Xinlei , Li Na , Wang Wenhao , Wang Guixian , Wang Huiyu
Published: December 2019

A smart energy meter life prediction system is proposed to evaluate the actual state of the smart energy meter, predict life and complete quality control. A method combining single component modeling and partial module integral function simulation modeling is adopted. According to the sampling module and the metering module, a smart electric energy table simulation model is established by using a reasonable mathematical algorithm. The life influencing factors of each module of the smart energy meter are integrated and organized into a simulation model of the life prediction software of the smart energy meter. The smart meter measured data, the power meter measured data and the model simulation measured data are compared to verify the validity of the simulation model. The proposed method provides new technical support for the life prediction of smart energy meter.
Simulation and Research on Single Machine Infinite Power System Model
Authors: Hou Huiting , Liu Jiaxing
Published: December 2019

With the increasing size of power systems, various failures can pose a threat to the safety of power plants and users and multiple power equipment within power plants. Therefore, time domain simulation is used to verify that the power system is in a certain state. Whether it is stable or not has important theoretical and practical significance. According to the circuit model requirements of the grid power supply system, the dynamic simulation software Simulink is used to build a simulation model of the single-machine infinite power system, which can meet the needs of various faults that the power grid may encounter.
An active set approximation method for the design of broadband beam former
Authors: Tan Xiaofen , Xiao Mei , Feng Zhiguo
Published: December 2019

The microphone array beam former design problem in far-field environment is to design the coefficients of FIR filters such that the maximum error between the actual response and the desired response in a specified domain is minimized. The specified domain is always very large and this problem is a large scale optimization problem. In general the complexity of the optimal method for solving this problem is very expensive. In this paper, we apply an active set approximation method to solve this problem. First, we transform this problem into a semi-infinite programming problem. Next, we find an approximate active set such that the scale of the problem can be mostly reduced. Then, this problem can be solved efficiently and the approximate solution is very close to the optimal solution. Numerical experiments are illustrated to show the efficiency of the proposed method.
Multi-User Concurrent Job Scheduling Method of Network Analysis Application Based on CPU/GPU Cluster
Authors: Luo Yadi , Li Jing , Lu Jun , Guo Ziming , Yan Bo , Ning Wenyuan
Published: December 2019

Multi-channel multi-core CPU parallel and CPU+GPU heterogeneous parallel are effective means to enhance Network Analysis Application computing. To solve the job scheduling problem of Network Analysis Application with multi-level dispatching, multi-user, multi-task in CPU/GPU heterogeneous cluster environment, a multi-user concurrent job scheduling method for Network Analysis Application in CPU/GPU cluster is proposed. According to the characteristics of Network Analysis Application, it is suggested that state estimation and dispatcher power flow should be accelerated in parallel with CPU, while static security analysis, perturbation power flow calculation and interruption capacity scanning should be accelerated in parallel with CPU+GPU. The job scheduling method proposed in this paper can satisfy the high concurrent requests of multi-level Dispatching & Control Center in the isomorphic and heterogeneous computing environments.
Research on the Improvement of Airport Comprehensive Support Capability Based on Data Mining
Authors: Zhang Xiuming , Xue Jianhai
Published: December 2019

The “integrated airport support capability” is a general term for all the ground support capabilities in the airport relative to the sky. For the protection of the airport, especially during peak hours, it is necessary for multiple units to coordinate and participate together. The best guarantee of the apron in an airport is the operational efficiency during peak hours. This paper firstly identifies the support capacity of an airport during peak hours, and then analyzes the data of the airport peak period, so it is concluded that those factors play an important role in the key guarantee of the airport peak and the key guarantee for the airport. The factors put forward the opinions of optimization, which can greatly enhance the comprehensive support capability of the airport.
Research on Space Wireless Drive Mechanism Based on Wireless Measurement and Control Network Technology
Authors: Zhang Yongjie , Hu Bin
Published: December 2019

In this paper, a new design scheme based on ZIGBEE network technology is proposed for the space wireless drive assembly, and preliminary experimental verification is obtained. The space wireless drive assembly based on ZIGBEE network technology can effectively reduce the weight of the drive assembly, improve the life, and compare the performance of the traditional drive assembly with the wireless drive assembly, which provides a useful basis for subsequent research.
Research and Analysis of Electromagnetic Thrust of Variable Pole Distance Linear Induction Motor
Authors: Liu Xijun , Gao Lixia , Liu Xiaohan , Peng Xu , Yang Guolong , Mou Shirong
Published: December 2019

According to the actual acceleration index requirements, a high-speed large-thrust linear induction motor for accelerating the system was designed. Due to the variable pole pitch design, the variation of the pole pitch plays a key role in the design, and the influence of the variation of the pole pitch on the output of the electromagnetic thrust is analyzed. The variable pole distance double-sided linear induction motor is used as the acceleration drive. It does not need to detect the speed and displacement. The primary winding current frequency is constant. As the speed increases, it will not be limited by the inverter frequency, and will not increase the motor loss. The frequency is constant and the control is optimized and simpler.
DC Motor Speed Control System Based on PI Controller
Authors: Zhao Xiangyu
Published: December 2019

This paper designs a closed-loop DC motor drive speed control system based on PI regulator [1], which has the advantages of dead zone control, simple structure and high stability. The system main control is a MCU, with peripheral functions such as key input and liquid crystal display, and human-computer interaction is good. The H-bridge driver circuit adopts discrete component design, and adds IR2104 half-bridge driver with bootstrap circuit to realize control of MOS transistor. In addition, the logic circuit added in the circuit realizes one PWM signal to drive the motor, which reduces the requirement of the single chip microcomputer, and uses less single chip resources to achieve the same driving effect. The PI controller based on the op amp design allows the system to effectively track the speed and the speed can be stabilized to a given value.
Research on Test System of Signal Interference Resistance of Power Communication Carrier Channel
Authors: Li Guochang , Li Ji , Liu Heng , Song Weiqiong , Xian Huizhu , Luo Yizhao
Published: December 2019

In view of the current low-reliability and low accuracy of power line carrier communication performance test equipment in the anti-interference performance test, the article deeply analyzes the technical implementation of the test system and the key technology requirements of anti-interference test. The electromagnetic conduction and radiated crosstalk and its multipath interference existing in the test system frame structure are studied, and the communication performance test system of the point-to-point carrier communication module is designed in the low-voltage power line channel environment. The test system has a simple structure and strong practicability. It can realize point-to-point communication error rate test and effective communication rate test, and can comprehensively evaluate the performance of the communication module according to the test result, and can horizontally compare the communication performance of the carrier communication modules of different manufacturers. The communication performance of different types of carrier communication units of the same manufacturer can be compared vertically, and the versatility is strong.
Diagnosis and Research on Local Overheat Fault of Main Transformer
Authors: Li Peng , Ma Xin
Published: December 2019

The main transformer is a transformer used to deliver power to a power system or user in power plants and substations. This paper introduces the use of infrared imaging detection technology and gas chromatography analysis technology as the main means to accurately diagnose a local transformer overheating fault. The article elaborates the diagnosis method, diagnosis process and treatment suggestions, and deeply analyse the causes of the local transformer overheat fault, and provides reference for the diagnosis and analysis of the same type of transformer fault.
DDS-Based Flexible UWB Pulse Generator Using Anti-Nyquist Sampling Theorem
Authors: Wang Qingping , Wang Chang , Xie Tao , Huang Jingjian , Yuan Naichang
Published: December 2019

A real all-digital and all-coherent arbitrary ultra wideband pulse generator is presented. The generator is a multi-core & single-channel (MCSC) direct-digital-synthesizer (DDS) which consists of 16 sub-cores and a high speed digital analog converter AD9739. The ultra-wideband pulses are generated according to the proposed anti-Nyquist sampling theorem. Their frequencies are aliasing in the first and second Nyquist zones. By purposely aliasing the spectrum, the output bandwidth can be increased greatly. All the parameters including pulse width, bandwidth, amplitude, pulse type, pulse repeat frequency and modulation are user-controlled on-the-fly. In order to test the performance, monopole pulse, monocycle pulse and two 4th order Gaussian pulses are generated. The monopole pulse whose pulse rate can achieve 2.5 GHz has a 10% pulse width of 450 ps, a 200 mV peak amplitude and a -10 dB bandwidth of 2.15 GHz.
Design of transformer secondary voltage drop on-line monitoring system based on Internet of things
Authors: Hao Yanjun , Chen Honggang , Zhang Taoyun , Zhang Yugang , Wen Dingjun , Zhang Kun , Chen Mingxia
Published: December 2019

The “two sessions” of the company in 2019, the company’s chairman, Comrade Kou Wei, put forward the strategic goal of “three-type two networks, world-class”, making it clear that the 2021 will initially become a world-class Energy Internet company with Global Competitiveness It has also laid out key tasks in the distribution sector, including the strategy for vigorously fighting poverty through services and rural revitalization, making continuous efforts to improve the business environment for electricity generation, upgrading the construction of power distribution networks, and establishing standards and demonstration zones for power distribution networks. The company proposed the “1135” New Era Power Distribution Management Strategy: customer-centered, to improve power supply reliability as the main line, to strengthen standardized construction, lean operation and maintenance, intelligent management and control, we will endeavor to build a first-class modern distribution network with good structure, equipment, technology, management and service. By improving the distribution network’s ability of intelligent perception, data fusion and intelligent decision-making, a “clean, low-carbon, safe and efficient” intelligent distribution network energy system is constructed. The comprehensive error of electric energy measurement in distribution network is composed of voltage transformer error, current transformer error, watt-hour meter error and voltage drop of secondary circuit of voltage transformer. The measurement error caused by the voltage drop of the secondary circuit of the voltage transformer accounts for a large proportion of the total errors of electric energy measurement. Because the voltage drop is too large, causes the little electricity quantity as well as the generation and supply quantity imbalance, the line loss gives the negative number the example all to appear.
Differential Game Research on the Development of New Energy Automobile Enterprises under the Background of Subsidy Retreat
Authors: Tian Yuan
Published: December 2019

Under the background of the government’s subsidy for new energy vehicles, this paper takes a secondary energy supply chain composed of a new energy automobile enterprise and an online car-hailing platform as the research object. Considering the long-term dynamic characteristics of cooperation between new energy automotive enterprise and online car-hailing platform, this paper constructs a differential game model of automotive enterprise and online car-hailing platform under decentralized decision and centralized decision, and obtains their equilibrium strategy and optimal profit function under the two situations, as well as the optimal trajectory of automotive carbon emission reduction over time. The research finds that: compared with decentralized decision, under the centralized decision, new energy automobile enterprise increase its efforts in emission reduction, and the operation efforts of online car-hailing platform increase. Pareto improvement is achieved in the profit of supply chain, and the carbon emission reduction of automobiles is improved. Finally, the model is verified and analyzed by numerical experiments.
Design of Intelligent Drifting Ball for Pressure Pipeline Inner Inspection Using Ultrasonic Technique
Authors: Du Xingji , Wang Min , Miao Cunjian , Ling Zhangwei
Published: December 2019

There are often corrosion and scaling on the inner wall of industrial pressure pipes. The spherical detector for pipeline internal inspection was proposed in the paper. The detector could be rolled with the fluid movement and collected a variety of information along the way by equipped with sensors such as ultrasonic probes. The presence and precise positioning of defects could be determined. The mechanical structure is the carrier of the spherical detector. One of the characteristics of spherical detector is that a number of probes are arranged on the spherical surface. In order to realize the above structure design, an algorithm for generating probe position was studied, and the probe is placed on the spherical shell by using this algorithm. The experimental results show that the mechanical structure has stable motion attitude. And the detector has good sealing performance, pressure resistance and internal structure layout. The research results of paper lay a foundation for the precise positioning of defects, and have important significance for ensuring the safe operation of pressure pipelines.
sorless Model Predictive Current Control by Using HF Pulsating Injection Method for PMSM Drive System
Authors: Lan Dongliang , Li Haoyuan , Yu Shengbin
Published: December 2019

This paper presents the high frequency (HF) pulsating injection method based sensorless control combined with model predictive current control (MPCC) for permanent magnet synchronous motor (PMSM). The use of MPCC makes the implementation of sensorless algorithm difficult due to the lack of a modulator. Therefore, HF current signal is injected instead of normal voltage signal, which is more suitable for MPCC rather than filed orient control (FOC). Besides, three-vector-based MPCC is utilized, which can reduce the current ripple effectively and improve the steady-state performance. Finally, simulation results demonstrate the feasibility and effectiveness.
The Research on Logistics Efficiency and Otherness on Primary Zone of Jilin Province
Authors: Liu Haidong , Tang Jingzhuo
Published: December 2019

Logistics efficiency is a very important index for measuring the development quality of logistics industry and even region economies. In this paper, the index system upon the logistics efficiency of primary zone of Jilin province were constructed and the logistics efficiency were calculated by Malmquist-Dea Model. The result showed that the logistics efficiency had been generally declining in recent year, the logistics efficiency overall level is not high and the region differences still exist. The results also indicated that the scale efficiency change can promote total factor productivity (TFP) but the technology change hinder the development of TFP.
Analysis of the Influence of Aviation Logistics on the Regional Ecological Economic Development of Jilin Province
Authors: Feng Miao , Tan Qing , Lv Xing
Published: December 2019

With the economic development entering the stage of normalization, ecological and globalization, aviation logistics has become a growth point of economic development and has become an important force to promote regional ecological economic development. It can more effectively promote regional industrial division of labor and optimal allocation of resources. The industrial structure upgrade of the service area will be more professional and planned. Taking the aviation logistics of Jilin Province as an example, this paper explores the relationship between its development and the regional economy of Jilin Province, and punishes quantitatively and qualitatively, and discusses the important contribution of aviation logistics to the regional economic development of Jilin Province.
A New High-speed Drive Topology of Wide-bandgap Power MOSFET Based on Dynamic Procedure Model
Authors: Zhao Chuang , Guo Wenyong , Zha Wenhan , Cao Shaoqun , Yang Benkang , Gao Huijuan , Cai Yang , Tian Chenyu
Published: December 2019

More and more attention is being drawn on the wide-bandgap power MOSFET, for its performance is far superior to the traditional silicon MOSFET. Driving technology is one of the key factors that influence the performance of device. In this paper, a high-speed drive circuit topology is proposed. The principle of the improved drive circuit is simple and easy to be implemented. Compared with the traditional design, it can reduce the switching time while maintaining the original driving performance.
Structural Strength Analysis of Gearbox Casing Based on ABAQUS
Authors: Tang Xiaohan
Published: December 2019

In order to improve the transmission accuracy, static and dynamic characteristics of the transfer gearbox of a test bench, a numerical model is built by finite element software ABAQUS to analyze its static characteristics. The static analysis under typical working conditions are investigated to obtain the stress and the strain, and then the static reliability of the structure is checked, which provides theoretical basis and guidance for the structural optimization design of the gearbox. The research shows that the gearbox structure is reliable and has greater space for structure optimization, which can improve the transmission accuracy and static characteristics.
The Study of Chromaticity Optimization for Photo Alignment IPS LCD
Authors: Zhang Yu , Song Yanjun , Zhao Yongchao , Zhao Rentang , Hsieh Chung-Ching , Zhang Shengdong
Published: December 2019

The new methods of optimization of chromaticity for IPS mode have been presented. We have investigated the effect of the alignment angle on the panel chromaticity base on a new photo alignment material composition. The chromaticity of panel also can be improved by optimizing the angle between LC initial orientation and pixel metal electrode for red, green and blue pixel, respectively.
The Analysis of DC Fault during the Hybrid MMC Start-up Process
Authors: Han Lei , Jiang Junfeng , Yao Haitao
Published: December 2019

The hybrid Modular multilevel converter(MMC), which includes both full-bridge sub-modules (FBSM) and half-bridge sub-module (HBSM), has DC fault ride-through capability and is receiving more and more attention.Current researches are focused on the DC fault in the normal operation of the system.However, there is a lack of analysis of the DC fault during start-up process.This paper introduces the characteristics of the pole to pole fault during the start-up process and analyzes the effect of the pole to pole fault on the sub-module charging.Simulation in PSCAD/EMTDC is implemented to verify the correctness of analysis in this paper.Based on that, new suggestions for DC fault protection are proposed.
Low-voltage power supply system based on three-phase to two-phase and integrated power quality control method
Authors: Guo Cheng , Yang Lianghui , Zhang Liyan
Published: December 2019

The two-input single-phase transformer is widely used in the 10kV power distribution system. However, this power supply mode has the disadvantage of the 10kV side three-phase unbalance problem. In response to this problem, the paper proposes a new 220V single-phase low-voltage power supply system based on a three-input single-phase transformer. The power supply system consists of a three-phase transformer and a two-phase transformer and a phase-to-phase power controller. The three-phase to two-phase transformer is used to realize two low-voltage single-phase power supply, and the phase-to-phase power controller is used to realize the negative sequence and harmonic control of the low voltage side. This power supply mode is suitable for large-capacity low-voltage power supply systems with single-phase load intensive. The paper analyzes the transformation theory and control strategy of the power supply mode. Finally, the superiority and effectiveness of the proposed technical scheme and control strategy are verified by simulation analysis.
Research on Application Validation Methods of Electrical Performance of TVS
Authors: Liu Yanqiu , Quan Li , Zhu Hengjing , Wu Licheng , Wang Wenyan , Zhang Hongwei , Luo Lei
Published: December 2019

Transient Voltage Suppressor (TVS), as an effective protective device in the form of diode, has found wider application in power circuits and signal circuits, which aims to protect secondary power and signal circuits. TVS only operates in case of circuit abnormality, which however is hard to be simulated, and it is also hard to measure whether such abnormality damages other circuits, thus it is necessary to carry out comprehensive application validation on such devices. A validation method about the electrical performance of TVS has been studied in the paper, which is analyzed based on application demands, and the test items and test method for electrical performance validation have been devised as well. Based on this method, the electrical performance of BSY6125 TVS manufactured by Beijing Microelectronics Technology Institute has been subjected to application validation, with a comprehensive evaluation on the electrical performance of the device achieved. This method can also be promoted in the application validation of other TVS.
Research on Modeling and Control of Tilting Three-rotor UAV
Authors: Wang Baocai , Luo Zirong , Shang Jianzhong , Xia Minghai
Published: December 2019

The tilting trirotal UAV is a new type of aircraft that combines the characteristics of fixed-wing UAVS and multi-rotor UAVS. To study and solve the control problems of tilting rotor UAVs, This paper focuses on the mechanical analysis of the rotor mode, and establishes the mathematical model. Simulation of rotor flight mode in MATLAB/SIMULINK environment, provides strategies for the design of tilting rotor UAV control systems.
Regional Protection Device of Reaction Ground Fault and Fault Determination Method
Authors: Deng Demao , Hu Bingxuan , Ren Tinghao
Published: December 2019

With the application of new technology and development of new energy, more and more distributed power sources are connected to the grid. A regional protection device and fault determination method are designed, as a result of failure to swiftly, efficiently and accurately identify, locate and cut off the fault in regard of ground fault reflection of distribution network, to solve the technique problems of variation of load distribution in distribution network, and the invalidation of segmental protection coordinated by time alone when massive distributed generation is input into operation. And designed a type of regional protection device.
Construction and Experimental Study on Subjective Evaluation System of Braking Performance of New Energy Vehicle ABS System
Authors: Hu Zongmei
Published: December 2019

Based on the defects of the objective evaluation index of braking performance of new energy vehicle ABS system, this paper constructs the subjective evaluation system of braking performance of New energy vehicle ABS system by using analytic hierarchy process (AHP), and designs subjective evaluation test table for ABS system and carries out road test.The test results show that the constructed ABS subjective evaluation system test is consistent with the objective evaluation index, and can feedback the driver’s subjective feelings, which can be used as the final evaluation of the new car market.
Study of the Flow on No-Load Breaking of SF6 Circuit Breaker Based on Lattice Boltzmann Method
Authors: Gui Meijing , Gao Fei , Zhang Junmin
Published: December 2019

In the simulating breaking of SF6 circuit breaker with the finite difference method and finite element method, there are some disadvantages such as a long calculation time and a complex calculation procedure. In this paper, a new method which is based on the lattice Boltzmann method (LBM) is presented to simulate the breaking process in an SF6 circuit breaker. And the model of nozzle arc is established by the lattice Boltzmann method. The flow in the arc-extinguishing chamber is calculated with the LBM. The pressure and velocity fields of the upstream and throat of the nozzle in the chamber are obtained by the simulation. Compared with the test data, they are good agreement. The results show the feasibility and correctness of the lattice Boltzmann method in studying the evolution of gas flow of nozzle during the breaking.
Analysis of Influence of Inverter New Energy Transient Short-Circuit Current Harmonic Component on Transformer Differential Protection
Authors: Huang Yuyuan , Zong Wei , Zhang Bo
Published: December 2019

The second harmonic braking protection is the key to the differential excitation inrush current of the transformer and the quick action of the differential protection. In this paper, it is verified that the large-scale inverter type power supply may affect the second harmonic braking protection of the transformer. The mechanism of generating the second harmonic component of the current during the short-circuit fault of the inverter-type power supply is analyzed. Further analysis of the secondary harmonic current generated by the inverter-type power supply during the fault in the transformer zone may cause the second harmonic braking component of the transformer. Finally, the correctness of the analysis is verified based on the PSCAD/EMTDC transient electromagnetic simulation software.
Improvement of Digital Guidance for Tracking of the Last Stage of a Shipborne Unmanned Antenna
Authors: Yang Liu , Jing He
Published: December 2019

This paper proposes its background from an unmanned antenna needs digital guide to lead it to accomplish getting the target to existing digital guide for initiative Aerospace measurement has a poor accuracy. Then the principles of three major errors of digital guide namely time difference, visual difference and delaying accumulation error are explained and thus each method to each error has been given.
Features of change in strength and modulus of elasticity of various layers of vibrocentrifuged fiber-reinforced concrete columns of annular section
Authors: Shcherban’ E M , Stel’makh S A , Prokopov A Yu
Published: December 2019

Upon carrying out the studies, the authors identified the features of strength and elastic modulus variation of different layers of vibration centrifuged fiber-concrete tubular columns. They provide rationalization for the variational nature of test structures, i.e. combinations of layers, the properties and characteristics of which are different. To reveal the trends of changes in the physical and mechanical properties of a structure by layers, the authors performed a through ultrasonic scanning using a Pulsar 2.2 device. The authors verified the applicability of the described technique for the variational vibration centrifuged structures. Three test cubes used for compression strength determination were produced from each the inner, middle, and outer layers. Confirming theoretical data on centrifugal molding, the authors revealed that the outer layer of the structure, which experienced the maximum centrifugal force, had the greatest strength, and the inner layer had the minimal strength. Substantiation of the fact that the variational vibration centrifuged structure is three-layered was confirmed experimentally.
Modifying additive for dry building mixtures
Authors: Loganina V I , Frolov M V
Published: December 2019

It is proposed to use limy finishing compositions with a modifying additive in thermal insulation. Such additives are obtained in two-stage synthesis technology. The mineralogical composition of the additive is represented by a mixture of synthesized hydrosilicates and calcium aluminosilicates. The method of lime absorption from lime solution was used to find out the additive pozzolanic activity. The authors estimate the efficiency of using additives in the composition of calcareous dry mortars. The compressive strength and the content of free lime in lime composites are determined. Further, the paper provide the feasibility of the adopted two-stage synthesis technology. Finally, the authors obtain the crack resistance of coatings based on a heat-insulating calcareous dry mortar intended for finishing aerated concrete.
Fine-aggregate concrete with polymer and basalt fiber
Authors: Perfilov V A
Published: December 2019

The article covers the results of research and experimental studies aimed at determination of the impact of polymer and basalt fibre as well as plasticizing agents on the properties of fine-aggregate concrete. The authors identified the physical and mechanical properties of fine-aggregate fibre-reinforced concrete depending on the amount of basalt and polymer fibres. The article also dwells on the impact of different plasticizing agents on the properties of fine-aggregate fibre-reinforced concrete. It was determined that the optimal concentration of polymer and basalt fibre is 0.9-1.0 kg/m3 when maximum compression strength and tension in bending have been reached. The authors managed to select efficient superplasticizing agents Sika ViscoCrete 5-800 and POLIPLAST SP-4 which provided maximum increase in strength of fine-aggregate concrete. It was determined that the use of polymer and basalt fibres ensures increase in strength and crack resistance of the obtained fire-aggregate concrete compositions.
The effect of aluminosilicate modifying additive on the deformation properties of adhesive dry building mixtures
Authors: Zhegera K V , Pyshkina I S
Published: December 2019

The article provides information about the possibility of using amorphous aluminosilicates as a modifying additive for dry building mixtures. The data on the synthesis of the additive, its chemical and physical properties are given. A recipe for adhesive dry building mixtures with the use of amorphous aluminosilicates is proposed synthesized by the proposed method. The technical and physical properties of tile adhesives made using amorphous aluminosilicates as a modifying additive are considered. The deformative properties of tile adhesive made on the basis of the proposed recipe are considered. The elastic modulus of the coating, shrinkage deformation, ultimate tensile strength, axial tensile strength and crack resistance coefficient are calculated. According to the results obtained, appropriate conclusions were made.
Structurization of cement systems with nanodispersed silica stabilized with acetate ions
Authors: Lukuttsova N P , Golovin S N
Published: December 2019

The influence of a modifying additive in the form of silica sol stabilized with acetate ions on the structure and properties of cement stone has been studied. The mechanism of structure formation in the system of “cement-nanodispersed silica (NDS) stabilized with acetate ions” is proposed. It includes two aspects. In the initial period of hydration the crystallization of calcium hydroacetoaluminates occurs, the rate of their formation being higher than the rate of ettringite formation. Their crystals have some micro-reinforcing effect on cement stone, increasing its density and strength. The nanodisperse silica in combination with the calcium hydroacetoaluminates is directly involved in the structurization of cement stone, colmataging the pores. Si4+ atoms, building-in in the structure of portlandite phases, increase the impermeability of cement stone. The generation of calcium hydroacetoaluminates leads to the formation of the primary carcass, providing the strength development of cement stone in the early stages of hardening. It is established that adding the modifier results in pore redistribution in size: a decline in the amount of macropores and an increase in the quantity of the gel pores and submicropores (5-0.1 µm) at a constant micropore volume (0.1-20 µm).
Lightening of ceramic bricks based on red-burning clay
Authors: Pavlova I A , Sapozhnikova M A , Farafontova E P
Published: December 2019

To determine the possibility of using a mineral pigment based on the rutile form of titanium dioxide in the production of volume-colored ceramic brick in order to obtain lighter brick tones the studies are conducted. The previously studied low-melting clay of the Tyumen deposit was used as a basis. It was established that significant lightening of the brick does not occur even with the introduction of 8% of the specified pigment, although some lightening is appeared. In addition, with the pigment introduction, an increase in water absorption of bricks is observed, which leads to a decrease in the sample strength. Increasing the firing temperature to 950°C does not lead to an improvement in the quality characteristics of the samples, and even vice versa makes them worse. Thus, the use of a white pigment under investigation does not give a significant effect of lightening of ceramic red-burning clay.