bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluating Comprehensive Development Quality of a Regional Power Grid by Using an Integrated Multi-criteria Decision-Making Methodology
Authors: Zhang Xiaodong , Qin Kaiming , Si Ruihua , Ge Xianjun
Published: October 2019

Due to the economic situation changes and the continuous expansion of new energy power in China, a new evaluation methodology based on multi-criteria decision making (MCDM) should be proposed to promote the comprehensive development of the new regional power grid. Some criteria were selected to constitute an indicator system from the perspectives of the safety reliability, network structure and economic benefit. Then, an integrated evaluation model was proposed based on fuzzy AHP method and VIKOR method was applied to calculate a series of comprehensive evaluation indexes. A regional power grid was chosen as an empirical analysis to demonstrate the feasibility of the evaluation system.
Impact of wind power grid connection and interline short circuit faults on power grid
Authors: Luo Jiasong , Xu Tong , Wang Xinlei , Zhang Chao , Li Nan
Published: October 2019

With the gradual increase of electricity demand in China, wind power and other power generation has developed rapidly, which makes the structure of power grid more complex. The complex structure increases the risk of short-circuit fault of power grid. The rapid development of wind power intensifies the randomness of power grid operation. This paper uses MATLAB/Simulink to model power system, construct simulation, and analyse the influence of grid-connected wind power and short-circuit faults on grid stability. The results show that the fluctuation and impact of the active power on the user side are significantly weakened compared with those of the single wind power grid when the high-power stable power supply is connected to the wind power grid. The single-phase short-circuit fault has no disturbance to the user of the grid, and the two-phase short-circuit and three-phase short-circuit have greater impact on the voltage, current and speed of the user end.
Research on Intrusion Detection Method base on Cloud Computing
Authors: Cai Mengmeng , Wang Honglin
Published: October 2019

As a new generation of technology cloud computing has been widely applied to various fields, and owing to the problem of the security, the security problems of the data in the cloud computing platform has been becoming the focus of attention. Therefore, it is vital of cloud computing that to put forward a security mechanism to ensure the security of data in the environment of cloud computing. The related technology of Intrusion Detection is researched, and the thoughts of combining misuse detection and anomaly detection together are adopting. Then a method of anomaly detection based on data mining is given. It is the improved decision trees algorithm, and achieves a real-time updates of invading the signature database by misuse detection. It was improved through the experiment the application based on improved decision trees can detect the attack effectively and guarantee the security of the cloud computing.
Design and Research of SDN Unified Controller in Large Data Center
Authors: Wang Jiye , Liu Hui , Yu Cong
Published: October 2019

Firstly, this paper introduces the current situation and requirements of software defined network (SDN) controller in large data center, and then analyzes the mainstream SDN controller system, and then summarizes the development trends of the data center and SDN controller system. Next, this paper mainly introduces the design architecture and implementation technology of the SDN unified controller. Finally, it summarizes the advantages of the SDN unified controller system and discusses the challenges of future work on the project.
Evaluation and recovery of power batteries based on trusted blockchain traceability
Authors: Wang Benshan , Xu Zhuo , Tan Xiao , Ju Miao , Yang Jianfeng
Published: October 2019

In order to solve the new threats to human health and the earth environment brought by the large number of discarded power batteries in the future, we propose a method of power battery evaluation and recovery. We use trusted block chain technology to build a scientific, efficient and reliable power battery evaluation and recovery platform, through the power battery production, sales, use and recovery process, contact the manufacturers, dealers, users, charging stations, and other nodes. At the same time, through the battery built-in BMS system and wireless communication terminal, real-time access to the battery usage and performance parameters. When it is detected that the power battery meets the recycling standard, the battery can be transported to the waste battery treatment center through the logistics network established by the manufacturer. The treatment center uses alkaline precipitation and biocatalysis to centrally process the recycled materials and realize the recycling of the recycled materials. The method breaks down the technical barriers in the field of power battery evaluation and recovery, and provides scientific, efficient and advanced support for environmental protection.
The Study of Thermodynamics of Thermoplastic Explosive at 71°C
Authors: Gao Zan , Jin Penggang , Ren Songtao , Yang Jian
Published: October 2019

A testing system was established to measure at 71°C the expansion pressure of a thermoplastic explosive with different charge quantities and of thermoplastic explosives with the same charge quantity but different formulations. It is indicated that the growth of expansion pressure of the thermoplastic explosive is non-linear with the increase rate of the charge quantity. And the expansion pressure has the possibility of decreasing when the charge quantity reaches a certain value. The expansion pressure will vary remarkably with the selection of polymer materials with differed dynamic mechanical properties as additives.
Summary of Research on Causes and Aging Mechanisms of Insulation Defects of Power Capacitors
Authors: Sun Yi , Wang Xin , Sun Yu , Dou Yanan
Published: October 2019

As an important operation equipment in the power system, power capacitors mainly play the role of reactive power com-pensation, AC/DC filtering and so on. This paper describes the structure and insulation materials of power capacitors and analyses its typical defects. The research status of insulation aging mechanism of power capacitors, including electrical aging, thermal aging, space charge aging, etc., is summarized. Then, recommendations of the research direction of insula-tion aging mechanism are provided, and some suggestions on the production process of power capacitors are given.
Technical Requirements Analysis of Power Grid Development for High Proportion of Renewable Energy
Authors: Li Mingzhu , Wang Liying , Wang Yuqing , Zeng Bo , Zeng Ming
Published: October 2019

At present, China’s energy and power system is in a critical period of upgrading and transformation, and new energy power generation will occupy an increasingly important position in the energy field. In the future, new energy will be connected to the power grid on a large scale, which will bring challenges to the safe, stable and efficient operation of the power grid. Therefore, it is necessary to cultivate corresponding technologies to support the future development of the power grid. This paper starts with an analysis of China’s energy transformation vision, clarifies the many challenges that the power grid will face, and then proposes five key technical requirements for the future development of the power grid.
Classification of Energy Supply Modes for Regional Integrated Energy Supply Systems
Authors: Yang Yan , Zhao Jiaxin , Wang Yuqing , Zeng Ming , Wu Shengyu , Wang Shiju
Published: October 2019

This paper focuses on how to classify the energy supply modes in regional integrated energy system scientifically and reasonably. On the basis of considering the difference of energy supply in different regions, this paper designs and puts forward the classification index system of energy supply mode of regional integrated energy system considering different aspects such as regional climate characteristics and resource endowment characteristics, establishes the classification model of energy supply mode of regional integrated energy system, and carries out an example analysis of the index system and classification model, and finally summarizes and draws a conclusion. Fourteen provinces to be classified belong to seven typical regional energy supply models.
Research on Carbon Accounting Method and Economy of Electric Vehicle Charging Facilities Participating in Carbon Emission Permits Trading
Authors: Chen Weicheng , Wang Yuqing , Tian Shi , Zeng Ming , Zhu Bin , Hou Xingzhe
Published: October 2019

The development of electric vehicles(EV) has been widely established as an important way to ensure energy security and transform low-carbon economy in the world. However, the construction and operation cost of EV charging facilities is high and the profit channel is single, which makes operators in a long-term loss state. It is necessary to study the participation of EV charging facilities in carbon trading in order to find new profit growth points. On this background, firstly, the calculation method of carbon emission of whole life cycle of EV charging facilities is studied from the construction stage and the operation stage, which shows that the carbon emission accounting has technical feasibility. Secondly, the economic benefits of EV charging facilities participating in carbon trading market is analyzed, which shows that participating in carbon trading has economic rationality. Finally, a case study of the carbon emission accounting and economic benefits of EV charging facilities participating in carbon trading is carried out. The result shows that the economic benefits of EV charging facilities participating in carbon trading increase, and with the increase of charging amount and carbon trading price, the economic benefits increase continuously.
Research on the business model of electric vehicle charging facility construction project participating in carbon trading market
Authors: Chen Yunfei , Wang Yuqing , Cao Yuwei , Zeng Ming , Zhu Bin , Hou Xingzhe
Published: October 2019

In today’s society, the economy is gradually transforming to green and low-carbon. As the core link of the low-carbon industry of electric vehicles, charging facilities have great potential to participate in the carbon trading market. In this context, in order to promote healthy and orderly development for electric vehicle charging infrastructure industry and ensure its participation in carbon market economy, based on the analysis of the development trend of China’s future carbon trading market, this paper studies the business model of typical electric vehicles charging facility projects participating in the carbon trading market from three aspects of business structure, profit channel and operation mechanism, so as to improve the income level of charging facility operators while improving the carbon trading market.
Dynamic relationship between energy structure and economic development under the background of global energy Internet
Authors: Zeng Ming , Yan Tong , Xing Wang , Wang Liying , Sun Chenjun
Published: October 2019

With the continuous development of global energy internet, the energy structure is constantly optimized, economic growth and total energy consumption are gradually decoupled, and the optimization of energy structure will gradually become one of the key factors for economic development. For this reason, this paper studies the dynamic relationship between energy structure and economic development under the background of global energy internet. Firstly, based on Panel Data Model and production function, the dynamic relationship model of energy structure and economic development is constructed; secondly, the economic growth and various energy consumption data of 30 provinces in China from 2010 to 2016 are selected for empirical analysis to quantitatively evaluate the role of various energy sources in promoting economic growth; finally, the relationship between energy structure and economic development is clarified through elasticity theory. This paper analyses the economic benefits of energy structure optimization under the background of global energy interne.
Analysis and treatment of abnormal shutdown of 150MW unit due to low feed water flow
Authors: Li Wanjun , Li Xiaoxia , Yuan Chen , Li Chong
Published: October 2019

The water level of NO.2 high pressure heater rised when the 150MW turbogenerator set of a power plant operated normally, it was unassembled and checked. After the high pressure heater was put into operation, the water level of the boiler drum droped. After the standby electric pump was started and the electric load was reduced, the water level of the boiler drum still droped, resulting in the boiler feed water flow reduced to the protection action and the unit shutdown. Through inspection, it was found that the connecting rod pin of the manual valve at the outlet of the high-pressure heater was broken, which maked the manual valve at the outlet not fully open and lead to low water flow rate at the water side of the high-pressure heater.After the corresponding improvement and optimization measures were taken, the unit can be restarted and run normally .
Effect of HP heater emergency hydrophobic leakage on performance test results and unit economy
Authors: Zheng Wei , Lu Xueqing , Han Yue , Li Li , Zhu Lingkai , Guo Junshan , Shang Panfeng , Lao Jinxu , Ding Junqi
Published: October 2019

During the performance test of the unit, the HP heater emergency hydrophobic leakage will lead to errors in the calculation of the flow flowing through the turbine, thus causing deviation in the calculation of the test results. The influence of the main flow benchmark of feed water flow and condensate flow at the deaerator inlet on the test results is given by an example. The effect of the HP heater emergency hydrophobic leakage on the economy of the unit itself is analyzed by the equivalent heat drop method. It is concluded that when the condensate flow at the deaerator inlet is the main flow benchmark, the result deviation of the test results is much greater than that of the leakage on the economy of the unit itself.
Structural Design of 35kV Composite Cross-arm Transmission Tower
Authors: Wang Lei , Chen Ying
Published: October 2019

For a long time, steel has occupied the most of the market for transmission towers because of its high strength, stable performance and easy connection. In recent years, Fiber Reinforced Polymer (FRP) has become the focus of the power industry due to its advantages of high strength, light weight, corrosion resistance, easy processing and good insulation performance. Based on the overhead transmission line design specifications, design requirements, research and engineering practice experience, the structural design of the 35kV composite cross-arm tower is completed in the paper. The design of the cross-arm frame, the joint design and the dimensional design are considered. The finite element static analysis is carried out in ANSYS, and results show the maximum deflection of the cross-arm is 36.8mm in the condition of loads long-term effects. According to the national design code for overhead transmission lines, the maximum node displacement of the 35kV FRP cross-arm tower meets requirements of the national code. In addition, the maximum stress of the 35kV composite cross-arm tower is 242MPa, which is far less than the FRP strength values 1130MPa listed in the Mechanics of composite materials, so its design strength also meets the design requirements. Subsequently, through economic analysis, it shows that there are good economic benefits, social benefits and broad application prospects in the 35kV composite cross-arm tower.
An Energy Efficiency Optimization Method Based on Decoupling in Cloud Computing
Authors: Wang Xin
Published: October 2019

The cloud resource is becoming a key infrastructure carrying the various types of applications, and providing basic support for emerging areas such as artificial intelligence, big data, and internet of things. It is an important driving force for the development of science and technology. Cloud computing has laid the development direction and foundation for future computing. Because cloud is composed of large-scale distributed resources, resource allocation and optimization of computing efficiency in cloud computing is a very important task. In order to adapt to the complex use environment of multi-load parallel in cloud computing, this paper proposes a decoupling method in virtualization environment, which can optimize the energy allocation strategy of distributed systems and effectively improve the efficiency of cloud resources.
Modeling the Placement of Charging Stations for All-Electric Vehicles
Authors: Yi Xinyi
Published: October 2019

All-electric vehicles are attracting everyone’s eyes for its using clean energy rather than fossil energy. At the same time, Tesla, a rising and new born enterprise is famous for its futuristic design, which makes all-electric vehicles become more and more popular. However, the law that the development of supporting facilities is always likely to be relatively backward is confirmed in the progress of all-electric vehicles and charging stations.
Discussion on the Scheme of Preparing Ammonia Gas by Hydrolysis of Urea
Authors: Su Jingcheng , Xue Fangming , Chen Feng , Sun Yiqing , Liu Xiuru
Published: October 2019

The process of ammonia hydrolysis to prepare ammonia gas is often used in the denitrification of coal-fired power stations. Because of its safe and stable operation and low investment price, it has been widely studied and used. This paper analyses the equipment used in the process of preparing ammonia gas by conventional urea hydrolysis, and the layout of the site. Or rebuild the power plant to give professional advice.
Intelligent Computer Security Monitoring Information Network Analysis
Authors: Sun Yong , Wang Haiwen
Published: October 2019

At present, network information security monitoring still has problems such as poor processing capability, insufficient depth and breadth of detection, joint processing problems, and slow time. Based on this, the paper collects and stores web logs based on Web Service and Oracle10g database, and exchanges, communicates and encrypts data through SOAP and SSL; realizes data analysis service using J2EE platform; and realizes cross-platform display using Flex. The hardware and software implementation and test results show that the proposed system can quickly respond to various network security attacks, improve the work efficiency and work level of network information security monitoring, and reduce the risk and cost of network operation.
Analysis on the characteristics of compound-split mode powertrain system
Authors: Yan Haitao , Liu Kai , Cui Yahui , Pang Hui
Published: October 2019

In this paper, The rotate speed and torque relationship of the compound-split mode power split device was analyzed, and defined the mechanical point, analyzed the relationship between the power distribution ratio of system and transmission ratio, By using the lever diagram with four nodes, the relative position relations between the mechanical point and Power assembly elements were analyzed which will affect the transmission efficiency of the system, and through the analysis on the characteristic relationship between power elements, with the help of geometry theory to determine the characteristic parameters of planetary gear train, and provides the reference for the configuration design of the dual-mode hybrid system.
Aeolian Vibration Control Measures for JL/G1A-400/35-48/7 Conductors
Authors: Wang Guochun , Zhang Xuesong , Liu Shengchun , Ma Longtao , Li Bo , Wu Xueliang , You Yi
Published: October 2019

Aeolian vibration control measures for JL/G1A-400/35-48/7 conductors were studied with the energy balance method. The results show that the dynamic bending strain of the JL/G1A-400/35-48/7 conductors with FR dampers is much smaller than the conductor itself under a tension level of 25% RTS, but the dynamic bending strain of the conductors exceeded 120×l0-6 when vibration frequencies are between 30 Hz and 40 Hz and additional FR dampers have no obvious effect. The festoon wire dampers have very good energy dissipation capacity within wide frequencies. The Bate wire dampers were eventually designed as combinations of a 1.2 m single festoon wire dampers, which could reduce the dynamic bending strain of the JL/G1A-400/35-48/7 conductors between 30Hz and 40 Hz. The Bate wire dampers combined with FR dampers could respond to most of the frequencies experienced over the range of wind speeds causing vibration, and keep the dynamic bending strain of the JL/G1A-400/35-48/7 conductors under the required standard, which provides a reference for research and construction of UHV engineering projects.
Finite-time Extended State Observer Based Adaptive Optimal Control of Continuous-time Linear Systems
Authors: Zhang Qinghua , Lin Yong , Wen Yangdong
Published: October 2019

In this paper, a novel strategy iterative method based on finite-time extended state observer is proposed to find the online adaptive optimal controller for a class of linear continuous-time systems with completely unknown system dynamics and unmeasurable state variables. In this method, finite-time state observer estimates the system state variables by using the input and output information of the system and the policy iterative method uses the estimated state variables and system input information to iteratively solve the algebraic Riccati equation until the adaptive optimal controller is obtained. It is worth noting that the method proposed in this paper only uses the input and output information of the system, without requiring the apriori knowledge of the system matrices and the state variables. A numerical simulation example will be provided to demonstrate the effectiveness of the method.
Applying AHP Method to Construct App Icon Evaluation Index System
Authors: Zhang Xia , XuelinLi and
Published: October 2019

The 21st century is the era of the Internet, and mobile intelligent devices are increasingly becoming an indispensable part of our life, work and entertainment. As an important tool and means of mobile smart devices, APP is becoming more and more abundant in number and variety, and the competition among APP developers is becoming increasingly fierce. The advantages and disadvantages of APP depend on many factors. Based on the visual design of APP icon, this paper summarizes the theoretical overview, design principles and methods, emphatically explores the relevant factors in the design of APP icon, and constructs the evaluation index system of APP icon by using AHP method, and calculates the weight of the relevant factors in APP icon.
Image Tracking of Rotating Scene Based on Fusion of MEMS-IMU Data and Vision Data
Authors: Huang Zhengzhong , Tang Xiangcheng , Zou Shuoyi , Huang Zili , Li Linghui , Shang Jianrong
Published: October 2019

Image tracking is a research field in constant evolution due to the new technological advances. The limited-space and low-cost features of missiles restrict the application and development of image tracking. Missile-borne image guidance system is still facing a series of difficult issues of anti-interference. This paper constructs a practical image tracking model using Kalman Filter based on fusion of MEMS-IMU Data and Vision Data after deriving the transformation matrix between the image sequences and MEMS-IMU data. The tracking model is tested by experiments. The result shows tracking based on fusion of MEMS-IMU Data and Vision Data is an effective solution of rotating scene and tracking accuracy is about 4 times better than vision only. The achievements can be not only used in military field such as Precision Guided Weapons and Photoelectric Reconnaissance Device, but also broadly applied in commercial products such as Virtual Reality, Intelligent Robot, Unmanned Airborne Vehicle and so on.
Design and Implementation of Ethercat Master Based On ZYNQ
Authors: Zhang Huawei , Xiang Yu , Shi Haoqiang , Qin Fan , Niu Zhe
Published: October 2019

In order to realize the functional requirements of EtherCAT protocol and EtherCAT master station in the field of industrial automation, and to solve the problem that the real-time performance and stability of the current embedded master station controller is not high enough, a hardware scheme for implementing the function of EtherCAT master station is proposed based on the architecture of embedded Zynq-soc (ARM+FPGA). The scheme is herein proposed for implementing Ethernet card equipment of EtherCAT master based on FPGA to improve the stability and response speed of the link layer. Real-time system software implementation scheme based on Linux has been improved. Xenomai is adopted to improve the real-time performance of the system and the accuracy of control cycle. Finally, an embedded real-time EtherCAT master station is constructed, and the EtherCAT slaves are the testing platform of two sets of panasonic AC SERVO Driver MADHT series. The experimental results show that the master controller meets the compatibility of EtherCAT standard protocol, with high real-time performance and stability.
Research on Top-Down Design Method of Internal Combustion Engine based on NX Future Development
Authors: Huang Zhigang , Zhang Wenping , Zhang Xinyu
Published: October 2019

With the development of internal combustion engine, how to design complicated parts of internal combustion engine quickly and effectively is of great significance. In view of the rapid prototyping design research of internal combustion engine parts, we firstly formulate a prototype model design criterion. From the sketch parameterization, shape feature parameterization and assembly parameterization design ideas, we propose a parameterized model construction method in order to meet the requirements of model accuracy and extensibility in the top-down design of internal combustion engine. Then according to the performance of internal combustion engine and the structure characteristics of main parts, we develop a system design process and a part design process. At the same time, we put forward a top-down design platform for internal combustion engine, analyse platform development functions, platform development framework and platform development process. Finally accomplishing the prototype of internal combustion engine based on NX development and a complete development technology system of internal combustion engine platform so as to improve the success rate of internal combustion engine design.
Integrated Control Optimization of Dual Clutch Transmission Gears for Electric Vehicles
Authors: Sheng Jiawei , Tian Jinyue , Gu Yihui , Jia Yongtong
Published: October 2019

The control of the transmission shift in vehicles is significant for driving comfort. In order to analyze the shift quality effectively, the transmission system dynamic parameters are taken as the input variables, and the comprehensive evaluation index of the weighted form of the jerk and friction work is introduced to determine the optimization objective function. The optimization problem of dynamic parameter input variables is transformed into the parameter optimization problem that particle swarm can be processed by Fourier transform. So the optimal torque trajectory of the motor and clutch during the upshift is obtained.
Design of Dual-energy Signal Acquisition and Driving Circuit for Logistics Park Based on CPLD
Authors: Ren Jiao , Zhang Shaohua
Published: October 2019

With the increase of security and defense, the security inspection of logistics park has put forward high requirements, and the perspective imaging technology of truck has become the most important. In this design, a high-speed parallel programmable logic device CPLD and Verilog HDL language are used to design the driving circuit of the perspective imaging signal acquisition part of truck, which can not only realize high-speed signal acquisition, but also have high integration, high accuracy and strong anti-interference ability, and other characteristics. The simulation and experimental results show that the driving circuit can satisfy the requirements of high efficiency, high reliability and fast imaging for the perspective imaging technology of freight cars.
Thermal Conductivity Simulation of High Temperature Overalls Materials
Authors: Hu Weiye
Published: October 2019

When workers work in high temperature environments, they need to wear high temperature work clothing to avoid burns. The garment is often composed of three layers of fabric material, which are referred to as layers I, II, and III from the outside to the inside, and there is a gap between the layer III and the skin. We refer to this void as the IV layer. In order to make the design of special clothing more efficient, reduce research and development costs, and shorten the development cycle, this paper uses mathematical models to determine the temperature changes outside the skin of the dummy. We assume that the body temperature of a dummy wearing a high temperature workwear can be controlled at 37 °C. We have established a set of thermal differential equations as a heat transfer model for the four layers of high temperature work clothing. First, we consider three heat transfer modes of heat conduction, heat radiation and heat convection, and analyze the heat conduction form of each layer to obtain a one-dimensional unsteady heat transfer model. Then, the numerical solution of all partial differential equations is obtained by the finite difference method of Crank-Nicolson format, and the temperature distribution outside the skin of the dummy is obtained. Finally, this paper gives a proposal for the design work of four-layer high temperature work clothing in combination with the actual situation.
Research on Tower Elevator Power Supply Mode Matching Maintenance Period and Wind Power Curtailment
Authors: Wang Fujing , Xie Lirong , Zhang Fang , Chao Qin , Li Jinwei
Published: October 2019

In order to reduce the difficulty of maintenance and Increase the utilization of wind power, this paper proposes a new program of internal consumption. First of all, through the main influencing factors which contain wind speed and direction of theoretical wind power, building history NWP data and the mapping theory possible output reflection database; Secondly, using clustering method to screen the better consistency historical samples and neural network model to generate the power demand forecasting curve; Finally, the forecast curve of wasted wind power is matched with the maintenance downtime. Analysis of historical data of a wind farm in XinJiang region show that the power supply mode of consuming wasted wind power during maintenance time is feasible. This model can effectively improve the utilization rate of wind energy, it also provides reference for related research.
A Prediction Approach of Hot Electric Power Researches for Heterogeneous Time Spans
Authors: Ma Yan , Qi Wei , Qi Dali , Chen Yufeng , Zou Lida
Published: October 2019

Recently with the rapid growth of electric power literatures, it is hard to artificially track and process hot electric scientific researches. In the past most, professionals use simple statistics to get high-frequency words, which is time-consuming and ignores the similarity between words. Moreover, different researchers have different requirements for prediction time span. In the paper we propose a prediction system for hot electric scientific researches and gives its implementation. It is based on our previous work and we improve it to suit indefinite prediction period. The proposed embedded RNN prediction model is flexible for heterogeneous time spans and can return prediction results rapidly and accurately. Our extensive experiments demonstrated that our approach has acceptable precision ratio as well as training time in comparison to SVM, RNN and linear regression algorithms. It also performs better when the embedded layers are multiple.
Based on The Comparative Study of The Economic Load Coefficient of a Double-Winding Transformer in Operation in A Certain Area
Authors: Zhang Tianyi
Published: October 2019

Extract the transformer parameters in operation in a certain area. After considering the selection of transformer characteristic parameters and the transmission in the system, the load coefficients of 17 double-winding transformers with 3 capacities are calculated theoretically. It is concluded that the economic load coefficient of various types of transformers in actual operation and the general value is about 0.5. People used to transformer economic load coefficient is 0.75 questioned.
The New Non-Volatile Based On STT-MRAM Lies in The Design and Implementation of High-Speed Cache of Magnetic Random Memory Material
Authors: Liu Tian , Zhang Wei , Xu Tao , Wang Guan
Published: October 2019

With the development of semiconductor technology, the buffer of processor integration is getting larger and larger. The high-speed design of storage capacity of traditional memory devices has an important connection with cache. How to design new non-volatile magnetic random memory has become an important step. To solve these problems, researchers at home and abroad have discussed a large number of new non-volatile memory technologies, which have excellent characteristics such as non-volatility, low power consumption and high memory density. The key optimization techniques for the disadvantages of high write power, limited write life and long write latency of the new non-volatile memory are analyzed. Finally, the possible research directions of new non-volatile memory devices in future cache optimization are discussed.
Profitability analysis of hydropower enterprises - Take GGEP as an example
Authors: Li Yanqin
Published: October 2019

Profitability is an important part of the business activities of an enterprise. This paper focuses on analyzing the profitability of listed hydropower companies by taking GGEP as an example, and also discusses the environmental factors affecting the profitability of GGEP, and puts forward Suggestions to improve the profitability of enterprises.
The Status quo and Issue of the Guangdong Electricity Market
Authors: Sun Qian , Wu Geng , Tian Lin , Fan Pengfei , Huang Yuanming , Zeng Zhijian , Xie Yuting , Hu Xiuzhen
Published: October 2019

With the implementation of electric power industry reform in China, establishing the efficient electricity, which can be suitable for China’s national conditions, becomes one hot topic. Guangdong is the earliest pilot in this reform, and it has the most active market trading in China. So it is imperative to analyse the status que and issue of the Guangdong electricity market, consequently the experience and problem can be referenced when the other province or region establish the electricity market.
Research on Data Acquisition Algorithm
Authors: Rong Jiachao , Zhang Yang
Published: October 2019

This paper studies the inclusion relational structure connection algorithms in three basic structure relationships, namely MPMGJN algorithm, Stack-Tree algorithm and Queue-Tree algorithm. The MPMGJN algorithm is the most basic structure connection algorithm and is less efficient due to unnecessary scanning and searching during connection. On this basis, this paper compares and analyzes two improved cache-based structure connection algorithms, Stack-Tree algorithm and Queue-Tree algorithm. At the end of the paper, the Queue-Tree algorithm implemented in C# is given, and the algorithm is tested with simulation data.
Research on Multi-objective clustering Optimization of Logistics Distribution Line
Authors: Liu Shiming , Chen Huihong
Published: October 2019

In order to improve the ability of logistics distribution line optimization, a multi-objective clustering algorithm based on particle clustering is proposed. The maximum density sparse detection and adaptive optimization method are used to schedule the logistics distribution route. The particle swarm optimization (PSO) algorithm is used to construct the multi-objective optimization model of the logistics distribution line. The global optimization characteristics of the particle swarm optimization algorithm are used to optimize the logistics distribution route. PSO adaptive clustering method is used to realize multi-objective optimization of logistics distribution path. The simulation results show that the method has better performance in the optimization control of logistics distribution line, improves the efficiency of logistics, reduces the loss of logistics line, and improves the throughput performance of logistics line.
Research on hospital intelligent construction based on weak current network system
Authors: Liu Mengkai
Published: October 2019

The era of information technology has spawned the rise of intelligent buildings, and as the basic module of intelligent buildings, weak electricity technology, computer technology, communication technology, and control technology have jointly built an intelligent platform, especially in modern hospital buildings. A wider range of applications. Based on this, the paper combines practical engineering cases to explore the application of weak current systems in modern intelligent hospital buildings.
Multi-period Planning of Electric Taxi Charging Station Based on Genetic Tabu Hybrid Algorithm
Authors: Chen Kaimei , Peng Chaojing
Published: October 2019

As an auxiliary facility for electric taxi operation, the charging station has important significance for the promotion of electric taxis in terms of location, scale and construction time. Most of the existing research on charging station location focuses on static problems, ignoring the impact of station time on the location model. Therefore, based on the site selection and queuing theory, this paper proposes a multi-period and multi-level electric taxi charging station model, with the goal of the total construction cost, the cost of the station and the minimum waiting cost. Combined with the multi-starting point of genetic algorithm and the strong local search ability of tabu algorithm, the genetic tabu hybrid algorithm for solving this model is designed. The simulation example is used to analyze and verify the validity of the model and algorithm, which can provide important reference for practical multi-period charging station planning.
Indirect Vector Control for Stand-alone Operation Brushless Doubly Fed Induction Generator Employing Power Winding Stator Flux Orientated Approach
Authors: Ji Kai , Long Wenfeng , He Jinping
Published: October 2019

The brushless doubly-fed induction generator (BDFIG) provides an interesting alternative to the commonly applied conventional doubly-fed induction generator in wind turbines. In this paper, a novel voltage control strategy of stand-alone operation BDFIG for variable speed constant frequency wind energy conversion systems was presented. Based on the model of the generator, the power winding stator voltage and flux for stand-alone operation BDFIG are only determined by the equivalent PW stator magnetizing current which are independent of load, but PW stator terminal output power is only determined by load. An indirect PW stator flux orientated vector control scheme is employed to control the BDFIG by regulating the amplitude and frequency of the control winding stator current appropriately, and this results in constant generator terminal voltage and frequency for variations in both load and wind speed. In addition, simulation results prove the feasibility and validity of the proposed scheme, and excellent steady and dynamic state performance is achieved.
Research on Topology and Modulation Control Method of a Novel Three-Level Current-Fed DCDC Converter
Authors: Ji Kai , Chen Tingyang , Long Wenfeng , He Jinping
Published: October 2019

Multilevel current source converter has the benefits of high output capacity, low current switching stress and low harmonic or ripple content. This paper presents a new topology of three-level current-fed DC/DC converter for superconducting magnetic energy storage application. In this topology, a superconducting inductance acting as a constant current source and a shunt inductance acts as current divider ensure current flows through the power switch components equally to generate immediate level of current. A novel kind of pulse width modulation (PWM) switching strategy for the current instantaneous control of the current source converter was proposed. The modulation switching strategy proposed is able to effectively control the DC current output of the converter. Also, due to the both of proposed topology and control method are quite a simple, it can be easily realized in the practice. Simulation results prove the feasibility and validity of the proposed topology and modulation strategy
Research on harmonic suppression of output current based on double pulse width modulation
Authors: He Dejun , Jiang Peng
Published: October 2019

The dc power supply can effectively improve the reliability of the output voltage and current through parallel connection, but at the same time, there will be an increase in the output current voltage harmonic compared to a single dc power supply. For this problem. In this paper, the dc step-down chopper circuit is taken as an example to analyze the output current under the double-pulse width modulation mode. Through calculation and experimental verification, it is shown that the modulation mode used in this paper can realize the suppression of specific subharmonics.
An optimized energy management strategy for fuel cell hybrid vehicles
Authors: Xiao Wenxin , Wang Lei , Liu Dongyin , Zhang Wenwen
Published: October 2019

Fuel cell hybrid vehicles are environmentally friendly and have good development prospects. Their energy management is very important, but there are currently few studies on this topic. In this paper, an optimized energy management strategy specifically applied to fuel cell hybrid vehicles is proposed. Fuel cell hybrid vehicles have some different characteristics from ordinary hybrid vehicles, which need to be considered in energy management. For the fuel cell to remain activated during driving, its output power must remain above a minimum power. In addition, it takes some time for the fuel cell to start up. These characteristics are considered in the vehicle model. The energy management strategy proposed in this paper maximizes energy use efficiency by controlling the SOC value of the battery. The SOC value of the battery is in the proper range during driving. At high speeds, fuel is consumed as a source of energy and the battery is charged to keep its SOC at a high level. When approaching the destination or when the vehicle is traveling at a low speed, the battery is discharged to reduce fuel consumption. Applying this strategy to the ECE-15 and EUDCL environments, the simulation results show that this optimized energy management strategy improves the energy efficiency of the fuel cell and enables the battery to operate at the appropriate power.
Rural area government purchases “safe drinking water project” obstruction and sustainable planning
Authors: Zhou Xiaoming
Published: October 2019

When we open the webpage to search for “China Water Resources”, we can see such a data: China’s total freshwater resources account for 6% of the world’s total freshwater resources, and its per capita possession is only 2,400 cubic meters, which is 13 poverty-stricken waters worldwide. One of the countries. China is a country with extremely scarce water resources. Water has always been one of the important factors in urban and rural construction. With the rapid development of the national economy, the shortage of water resources has increasingly become a problem. In 2002, China launched a large-scale South-to-North Water Transfer Project, which solved the water problem of more than 400 million urban populations, and the urban water use plan has become more perfect. The “Guiding Opinions on Improving the Living Environment of Rural Areas” (2014) pointed out that by 2020, the basic conditions of rural housing, drinking water and travel in the country have improved significantly, and the problem of safe drinking water in rural areas has gradually entered the public management line of sight. However, in rural areas, especially in remote mountainous areas, lack of water resources, scattered living, and limited infrastructure construction funds, it is not only difficult to achieve centralized water supply, but also trigger a series of grassroots disputes. It is hoped that by analyzing the implementation effect of the “safe drinking water project”, exploring the difficulties and obstructions of rural water resources development, in-depth “anatomy” of the problem, clarifying the “pathogenic source”, in order to solve the problem, and strive to reduce ecological damage on the basis of sustainable development. Rationally plan and use water resources to achieve smooth progress in rural safe drinking water projects.
From the Perspective of Investment Efficiency to See the Risk Management in Electric Power Industry
Authors: Chen Jieyun
Published: October 2019

With the continuous electrification of the global economy, the electric power industry has attracted the largest amount of energy investment in the world for two consecutive years. Under the background of the current new normal economy, the role of electric power resources in the national economic and social life is becoming more and more important. Therefore, this paper studies the investment efficiency of electric power industry, it is concluded that the inefficient investment in electric power industry is common in China at present, which is accompanied by the excessive power of management and excessive government intervention. Based on this, some suggestions are put forward to improve the enterprise’s inefficient investment behavior through risk management.
Giant magneto resistance for CuCoNi granular films prepared by electrode position
Authors: Yu Zhang
Published: October 2019

CuCoNi granular films were prepared by electrodeposition, and the magnetoresistance were measured. The results show that the content of Ni is favorable for separation of more magnetic particles in the films. More Ni addition would decrease the concentration of magnetic particles. XRD analysis showed that the addition of Ni is in favor of magnetic particles of layer depositing. Excessive Ni added in the film but reduced concentration of magnetic particles. The layer complete phase separation after 600 °C annealing, corresponding to the copper diffraction peak intensity reaches the maximum; There is a clear satellite peaks at the between Co and Ni diffraction peak. Vacuum annealing make superparamagnetic particles into ferromagnetic particles, improve the coercivity. The GMR results show that 450 °C heat treatment to achieve the best film structure, with a maximum GMR, higher temperatures will form a ternary alloy phase in making the film, the GMR value is the lower.
The Role of DC Component and Trend Term in FFT Transform Spectrum Analysis
Authors: Gao Yunqi , Zhang Jiaqi , Li Zhuo , Wang Jiahui , Li Xiaohang
Published: October 2019

Most of the actual signals are analyzed and processed with zero spectral line values. This paper describes the causes of this phenomenon and the solutions. Through the analysis of a group of specific experimental data, the N-point FFT transform is carried out. By observing the original data and the frequency-shifted spectrum, the original can be intuitively understood. The signal has strong DC component and trend term (trend term is also divided into linear trend term and polynomial trend term). Because of this, the frequency spectrum obtained by FFT is mostly zero. In this paper, the DC component of the signal is calculated and the trend term is eliminated by using the digital signal processing function of MATLAB, and the whole spectrum is obtained. Finally, the specific area is selected according to the actual requirements. The spectrum analysis was carried out to obtain the qualified spectrum.