bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Application of Electronic Analog Relay Protection Device with Load Check
Authors: Li Yu , Li Yunzhi , Zhao Bo 
Published: February 2020

Abstract
This paper designs an electronic substation simulation relay protection device with load check. At the same time, the device is studied and applied in the new substation. First of all, this paper analyzes the primary wiring mode and three-phase symmetrical current and voltage in the primary side of a typical substation, and confirms the transformer ratio, polarity and wiring mode of the current/voltage transformer. Then, by checking the polarity of line protection, metering, bus protection, main variable differential protection and backup protection, the polarity error of metering circuit with load check protection and metering circuit is effectively avoided. Finally, through the field test verification in the new 220kV Fuxing station of Jinzhou power supply company, it is verified that the technology adopted in this paper can fully meet the requirements of substation simulation load test. The relay-protection device with load check designed in this paper solves the problem that the conventional electric-type single-phase large-current generator can only detect the transformer ratio and polarity of the relative single-phase loop current transformer, and the difference loop cannot be detected. It shortened the switching operation time of changing ratio, polarity and phase check of the primary and secondary circuits after passing the load of the substation transmission belt.
Research on missile overload control technology with prescribed performance
Authors: Haiyan Li , Junbao Wei , Jing Li 
Published: February 2020

Abstract
Considering that the present control methods for missile overload don’t take the transient and steady state with prescribed performance into consideration. On the basis of backstepping idea, a controller design method with prescribed performance is proposed for longitudinal channel overload motion model of missile in order to improve the performance of missile control systems. It is proved that the system is stable in the sense of Lyapunov, the tracking error of the system satisfy the prescribed transient and steady performance. The given simulation results demonstrate the effectiveness of the proposed control method.
Analysis of resistance characteristics of liquid flow in microfluidic channels
Authors: Zhang Min , Liu Xuling , Li Tienan 
Published: February 2020

Abstract
In order to investigate the resistance characteristics of liquid flow in microfluidic channels, the mathematical models of liquid flow resistance in microfluidic channels are established in this paper. The microfluidic channel samples with different parameters are designed and fabricated by using soft lithography technology. The effects of channel parameters of channel aspect ratio α, channel equivalent diameter d

l
and channel length/diameter ratio l / d

l
on liquid flow resistance are analysed and tested through experiments. This paper reveals the flow resistance performances in microfluidic channels and provides research basis for improving the flow characteristics and optimizing the microfluidic channel structures.
Research on Wear Recognition of Electric Worker’s Helmet Based on Neural Network
Authors: Sun Yuwei , Fu Jing , Ma Qingshan , Yu Xinchun , Fan Guoxiang 
Published: February 2020

Abstract
Head injury is an important cause of electric construction accidents. Wearing a safety helmet is an effective measure to prevent electric construction accidents, and in the work, unsafe behavior of workers without wearing a helmet often occurs. This paper proposes a neural network-based automatic cap wear automatic identification and detection technology to identify the behavior of unwearing helmets in power construction. In view of the shortcomings of the existing helmet detection scheme in the complex environment, such as low efficiency and low recognition accuracy, this paper selects the region of the neural network (Fast-er-RCNN) to identify the wearing of the helmet during the power operation. The overall scheme uses the target detection scheme based on the foreground detection technology to detect the target individual in the obtained video recording of the power operation. The Kalman filter algorithm is used to track the target in the video and solve the occlusion problem in the video image. Through the actual detection of power construction monitoring video, the availability and efficiency of the designed algorithm are verified. The target recognition accuracy can reach 85.7% and the recall rate is 87.5%.
High Voltage Transformer design based on Flyback Switching Power Supply
Authors: Chengcong Li , Zhenfang Fan , Hui Luo 
Published: February 2020

Abstract
The single source generator could change the frequency and duty cycle of the pulse to control the voltage of output in flyback switching power supply. A variety of methods and calculations could be used to design high voltage transformer, such as AP
method that will be used in this transformer, kg
method and KRP
method. In this paper, the process of how to select the magnetic core and the other parameters of the transformer will be discussed step by step. At first, the voltage of output will be over two thousand and five hundred voltage. The single source generator changing the frequency and duty cycle, the voltage of output will stay stability on five hundred voltage. The seize of the transformer is smaller than that has been used, so it will be beneficial for the circuit integrated.
Study on the detection method of the number of people passing through the wall based on IR-UWB
Authors: Wang Kunyu , Guan Ying , Luo Dan 
Published: February 2020

Abstract
The purpose of this study is to realize the detection of the through wall personal based on IR-UWB radar. The through wall detection system sends IR-UWB signal to the detection area, which can penetrate the wall and radiate to the detection area behind the wall. When transmitting or receiving IR-UWB signal, antenna array with a certain aperture is needed to achieve azimuth resolution. After receiving the echo signal, the IR-UWB through wall detection system stores or directly transmits the echo signal containing the target information to the signal processing platform for subsequent detection processing. This study can achieve the number of obstacle crossing and detection based on BP neural network, and can detect different numbers and different obstacles through two detection methods. The final experimental results show that compared with the traditional probability method based on maximum likelihood estimation, the probability of this method has been greatly improved, and the judgment effect has also been significantly enhanced. The achievements of this project can be extended to the fields of human and animal recognition, human health detection, intelligent medical treatment, intelligent home and so on, based on the protection of privacy.
Thoughts on the Application of Electronic Information Engineering in Electrical Engineering Automation
Authors: Bowen Lv 
Published: February 2020

Abstract
With the continuous development and improvement of information technology, the comprehensive utilization of electrical information technology, communication technology and electronic technology can promote the rapid development of electronic information engineering to a great extent. These will make electronic information engineering widely used in various industries. The application of electronic information engineering in the design process of electrical engineering automation system plays an important role in improving the level of automation and intelligence of electrical engineering. The analysis and research on the application of electronic information engineering in electrical engineering, and the discussion of the automation technology of electronic information engineering have important practical significance for promoting the development of electronic information engineering and the improvement of electrical engineering automation level.
Design and Implementation of Information and Communication Dispatching System Based on FreeSwitch Platform
Authors: Tang Wei , Jin Hai , Liu Kang , Liu Xu , Dong Wu 
Published: February 2020

Abstract
The thing of information and communication dispatching is a decision-making process and the core work of command centre. The accuracy and efficiency of information and communication dispatching work directly affect the service quality and corresponding social benefits. This paper first introduces the technology of FreeSwitch, a soft switch solution, including a soft phone and a soft switch to provide voice and chat product drivers. On the basis of demand research, the information and communication dispatching system based on IMS architecture, and the upper application based on SG-UAP platform were developed to realize voice dispatching, cooperative dispatching, recording, traffic service, configuration service and other functions. The system has also been deployed online. After continuous testing and drilling, the platform has been used in actual combat, marking the initial completion of the construction of the information and communication dispatching command system based on the FreeSwitch platform.
Abnormal Value Treatment and Seasonable Adjustment Method for Medium and Long-term Load Data
Authors: Li Xuxia , Wang Yao , Hu Yingying , Li Jia , Tong Xing , Liu Renhui 
Published: February 2020

AbstractSince most of the data used for power demand early warning, forecasting and analysis is the original power data collected directly from the power system, the data cannot be directly applied to the specific analysis because of having two problems. First of all, because various errors will occur in the power data collecting and transmitting processes, some random factors may cause the power consumption data to fluctuate drastically in a short period. These errors or problem data that do not conform to the overall change rule of the power sequence may lead to wrong analysis results. Secondly, because the electricity sequence has obvious seasonal characteristics, and the inherent variation of the load sequence is often obscured by the seasonal variation factors, using the original data for analysis directly often fails to discover the inherent regularity of the electricity consumption data. Based on these two reasons, the original power data should be conducted with abnormal value processing and seasonal adjustment before the power demand early warning, forecasting and analysis.
Design of loading test bench for precision ball screw based on LabVIEW+PXI
Authors: Lu Pengcheng , Fan Yuanxun , Pan Weidong , Cao Dawei 
Published: February 2020

Abstract
In order to discuss the dynamic characteristics of the aerospace ball screw pair, the paper designs a loading test bench based on Labview+PXI platform and magnetic powder brake. The test bench can simulate the loading condition up to 10Hz. In structural design, magnetic powder brake is used to apply the loading force. In hardware design, the system is built by using upper-lower computer system architecture based on PXI bus. In software design, the program is written in LabVIEW, which mainly includes the data processing and display program in the upper computer and the data acquisition program, the motor control program in the lower computer (PXI). Finally, the test bench was built and the inertia loading test and the rated speed loading test were carried out. The test results verify the effectiveness of the high-frequency loading measurement and control system, and provide a reliable test platform for the dynamic characteristics of the ball screw pair under high-frequency conditions.
Forecasting Model Of Electricity Sale Market Based On User’s Electricity Consumption Information
Authors: Gao Shifa , Wang Ai , Wang Zhigang , Wang Zheng , Tong Xing , Liu Renhui 
Published: February 2020

Abstract
The prediction of electricity sale market is directly related to the balance of electricity supply and demand. The high-precision prediction method of electricity sale market will effectively avoid the imbalance of system supply and demand, and improve the security and economy of the system. In the past, it was difficult to obtain the information of users’ electricity consumption, so the prediction methods of electricity sale market in the past were based on the overall electricity sale. The advantage of this method is that it can get the forecast value of the future electricity sales quickly and intuitively, while the disadvantage is that it fails to consider the electricity development trend of all walks of life that compose the electricity sales in detail.
Research on Design and Simulation of Drive Power Supply Based on Linear Motor
Authors: Zhu Zihan , Zhou Jiemin , Zheng Gang , Zhu Yongwei 
Published: February 2020

Abstract
In many fields, such as transportation, logistics, aerospace industry, industrial automation, etc., linear motion is required. The traditional approach is to use a rotating motor, after a series of conversion mechanisms, and then push the load to make a linear motion. However, this method not only has shortcomings of low efficiency, low precision, high cost, slow response, but also causes a lot of energy loss during the motion conversion process. The emergence of linear motors has made these problems well solved. The driving power supply can provide a stable working voltage for the linear motor and keep the working state of the motor, so it is the core device of the linear motor.
Three-Phase Unbalanced Treatment Scheme Based on High-Speed Power Line Carrier
Authors: Huang Rui , Guo Guang , Chen Jianhua , Liu Mouhai , Liu Zhiguo , Yu Minqi 
Published: February 2020

Abstract
Most of the low-voltage distribution networks are three-phase four wire systems. Because of the quantity and dispersion of single-phase power users, the three-phase load unbalanced problem exists in a large number of low-voltage stations. With the continuous increase of power consumption level of the majority of power customers, the three-phase load unbalanced has become increasingly prominent in low-voltage station area. In this paper, the mechanism of three-phase unbalance generation and the defects of traditional treatment methods are introduced. On this basis, a three-phase unbalanced treatment scheme for low-pressure station area is proposed. The scheme can test out three-phase imbalance of low-voltage substation area quickly and accurately, and adjust the load phase sequence in real time without power failure through the intelligent commutation switch system, so that three-phase load in the station area lies a comparatively balanced condition. The scheme can cut down the loss of transformer and line caused through unbalanced three-phase load e in nicely. And it can restrain single-phase overcurrent, and solve the problem of terminal low voltage treatment.
A Collaborative Planning Model of Power Source Considering the Uncertainty of The New Energy and The Power Market
Authors: Wang Ai , Wang Zhigang , Li Xuxia , Li Jia 
Published: February 2020

Abstract
This paper studies the model of power system adapted to the new energy generation and power market environment. A collaborative planning model of power source considering the uncertainty of the new energy and the power market is proposed. The construction of coal-fired thermal power generating units, wind power generators and transmission lines are considered. At the same time, in view of the uncertainty of wind power generation and electricity market, considering from two perspectives: the randomness of wind power output and the use of geometric Brownian motion to predict electricity price. Finally, the example application of the IEEE 30-bus system shows that the model can effectively coordinate the construction scheme of power grid and power supply.
Probabilistic prediction of electric power extreme load
Authors: Xue Jianjie , Wang Haiyun , Wang Ling , Zhang Di , Zhai Yan , Zhang Yuxuan 
Published: February 2020

Abstract
For load forecasting, the difficulty lies in how to accurately grasp some key points in the process of load fluctuation, such as the highest load and the lowest load. It is advisable to call the forecast of daily maximum load and daily minimum load as “extreme load forecast”. On one hand, we can use the whole day load curve forecasting technology to directly get the forecasting results of extreme load; on the other hand, we need to study the special method of directly forecasting extreme load. At the same time, the conventional extreme load forecasting results are generally deterministic. Only a precise value is given, which cannot estimate the probability of the load value and determine the possible fluctuation range of the forecasting results, ignoring the probability characteristics of the forecasting results themselves. In fact, because of the advance of the prediction problem, the realization of the uncertainty prediction is more in line with the objective needs. According to the probability characteristics of the prediction results, it is helpful for the decision-makers to better grasp the objective laws of the research objects in the aspects of risk analysis and reliability evaluation, so as to achieve more reliable and scientific analysis and evaluation. Therefore, it is of great significance to introduce the idea of uncertainty analysis to realize the probability prediction of extreme load.
Relationship between Network Traffic Topology Map and Degree of Competition
Authors: He Hanyue 
Published: February 2020

Abstract
This project will examine the relationship between the degree of competition between access providers and the price of Internet access in a particular country, as well as the impact of access provider topological characteristics on price and quality. Its purpose is to understand whether greater competition will result in lower network access prices. This project uses a scatter plot to show the relationship between these variables and attempts to build a model to express this relationship. The data used in this project includes Internet access prices and topology information of Internet Service Providers (ISPs). The data set is from the author’s previously published article ‘Establishing a database of competition between ISPs based on Python language’. The purpose of this paper is to demonstrate the relationship between the price and the bandwidth of the Internet access and the competition among access provider by the method of data analysis. And at the end, we increase the accuracy of the model by adding the possible influence variables.
Development of two-axis translation stage control system based on STC8A8K64S4A12
Authors: Shi Jiashun , Chen Jin , Qi Wen , Shen Huizhong 
Published: February 2020

AbstractBased on STC8A8K64S4A12 microcontroller and LabVIEW[1] software, the two-axis translation stage control system is designed. The two-axis translation stage is applied to a plane plotter, and the two rails are placed at right angles to form a horizontal motion mechanism. The two-axis controller consists of STC8A8K64S4A12 microcontroller control board and TMC5160 stepper motor driver[2], which realizes independent control of the two-axis translation stage. At the same time, PC software is designed, which can be connected to the two-axis controller through network interface or serial communication interface. The two-axis translation stage is controlled by a PC or a laptop. Repeated test experiments were carried out on the system. The experimental results show that the system has high reliability and control precision, and the horizontal displacement control accuracy is 0.01 mm.
Design of a CMOS Two-stage Fully Differential Operation Amplifier
Authors: Qiao Haotian 
Published: February 2020

Abstract
Based on SMIC 0.18um CMOS process model, the operation amplifier designed in the thesis is simulated in the simulation software Cadence. In the regular environment, it has DC gain of 107dB, unity gain bandwidth of 57.48MHz, phase margin of 64.83° and output amplitude more than 3 V.
Review of Lithium Battery Equalization Control Methods
Authors: Song Dawei , Shi Fengdong , Liu Wei 
Published: February 2020

Abstract
The high performance of power battery pack is used in the field of electric vehicles widely. With the continuous improvement of the cruising range, the energy imbalance of the power battery has become a limiting factor. This paper analyses and introduces the power battery equalization circuit. According to different circuit topologies, they are divided into two categories: Energy dissipative and non-energy dissipative. We Focused on the analysis of the working principle, advantages and disadvantages of the non-capacity dissipative equalization structure. Finally, this work summarizes the application and development direction of the power battery equalization control in recent years.
Modular Multi-terminal Flexible DC Micro-grid and Its Hierarchical Control Method
Authors: Liu Xiangli , Meng Fanbin , Song Wenzhuo , Guo Furan , Yu Xiaoying 
Published: February 2020

Abstract
In the traditional DC micro-grid, the structure is complex, the control is difficult and there is no fixed networking mode. Thus the construction of micro-grid is expensive and the output is slow. In this paper, a hierarchical control method of modular multi-terminal flexible DC micro-grid is proposed, which simplifies the structure and control method of DC micro-grid and is beneficial to the construction of micro-grid. The structure of flexible multi-terminal DC micro-grid and the modularized method of network construction are discussed. The feasibility of the study is confirmed by a specific example of DC micro-grid. On the basis of the above research, the hierarchical control method of DC micro-grid, the specific control method and control logic in each layer are determined. PSCAD/EMTDC simulation is established to verify the effectiveness of the proposed theory and control method.
The wear characteristics of wet clutches in the DSG vehicle in a 10km driving cycle
Authors: Jikai Liu , Jie Chen 
Published: February 2020

Abstract
In order to investigate the wear characteristics of wet clutches in the DSG vehicle during shift process, this paper presents a dynamic analytical model and an experimental test of wet friction pair for simulation and analysis. A detailed dynamic model is established firstly to calculate the dynamic load of the clutches during the shift process. The wet friction pair experiment is conducted to explore the wear behaviours under different conditions. Then, the wear coefficient is deduced. The experimental results indicate that, when the temperature is constant, the slipping speed has little influence on the wear coefficient, while the contact pressure is on the contrary. Then, an empirical formula is obtained to describe the relationship between the wear coefficient and the contact pressure. Based on the simulation results, the wear amount of the clutches fixed on the input shaft is about 0.8mg, while for clutches on the middle shaft, it is only 0.2mg within a 10km driving cycle.