bluuebunny/crossref_metadata_2025_split huggingface dataset:
Real-Time Safety Monitoring of Charging Pile Based on 5G and Cloud Computing
Authors: Xuefei Chang , Rongqing Yi , Chao Zhou , Lizhuo Liu 
Published: August 2021

Abstract
How to ensure the safety of charging pile including the protection of people, electric vehicles and batteries, has become the focus of social attention. This paper proposes a real-time safety monitoring scheme for the charging process based on 5G low latency and massively parallel cloud processing. The scheme is a second line of big data safety to ensure the safety of charging process. By accessing massive Internet of Things data in real time, it calculates in real time in the cloud to predict accidents, and gives early warning to the control system of the charging pile and the on-site management personnel of the charging station in time, so that they can timely intervene and control in advance, so as to avoid and reduce the occurrence of accidents.
Design of sliding mode adaptive DC-DC converter based on function approximation
Authors: Zhu Jiaxiong , Qiang JIANG , Feng CHANG , He Duyi 
Published: August 2021

Abstract
The output power and voltage of solar photovoltaic power generation are easily affected by climate and load changes, so it is necessary to use DC-DC converter at its output to provide stable output voltage. DC-DC converter is a time-varying nonlinear system. When the output load of the converter varies widely, the output waveform distortion and dynamic response speed of the DC-DC converter will slow down. The essence of sliding mode control is a kind of switch control method, and the DC-DC converter needs the switch of switch tube to realize voltage regulation. In this paper, a sliding mode adaptive control strategy based on orthogonal polynomial function approximation is proposed, and Laguerre polynomial is selected as the basis function of DC-DC transformation system. The output voltage error and its first derivative of the system are taken as the input of the network, and the output of the network is taken as the approximation term of the system uncertainty, and the network weight is updated according to the adaptive law. Through simulation and comparison, the adaptive controller designed in this paper is superior to the ordinary sliding mode controller in reducing chattering, adaptive load change and reducing the influence of system interference.
Security Management for Apps of Intelligent Substation Based on Blockchain Technology
Authors: liang Wang , chengwei Zhang , hanyun Chen , yangsen Li , yanguo Wang , chao Sun , liqing Ge , hua Tian , jingyu Teng , jianfeng Wang 
Published: August 2021

Abstract
There are many kinds of professional apps in station control system of intelligent substation. In this open and shared ecosystem, there are great security risks in app authorized installation, resource control, access control, and border protection. In this paper, a new approach of app security management based on blockchain technology has been proposed. By using the mechanism of tamper free and traceable "ledger" based on cryptography, the objective and traceable supervision of app's life cycle can be implemented through customization of blockchain's ledger. This paper provides a new solution for app security management of station control system in intelligent substation.
Research on Influencing Factors of Magnetic Shielding Effectiveness of Finite Length Cylinder
Authors: Wang Yang , Jiao Chongqing , Du Rongtian , Yang Yong , Wang Jialong 
Published: August 2021

Abstract
The article mainly studies the shielding effectiveness (SE) inside a cylinder with a finite-length metal shell. Since the SE inside an infinite-length cylinder is equal everywhere, this article focuses on exploring the SE of a finite-length metal shell cylinder. The article simulates the influence of the cylindrical shape factor (the ratio of the height to the inner diameter of the cylinder) on the SE at different frequencies; the influence of the frequency of the external magnetic field on the SE of the cylinder; the change of the SE on the central axis of the cylinder; the change in the SE on the central axis of the cylinder when a small hole is opened at the centre of the bottom of the cylinder; the change in the SE on the central axis of the cylinder when small holes are opened at the centre of the upper and lower surfaces of the cylinder.
Research on a new type of high-efficiency composite polymer odor bird repellent for overhead transmission lines
Authors: Xiaopo MAO , Guangyuan ZHOU , Xueming ZHOU , Chaohui LI 
Published: August 2021

Abstract
Aiming at the special needs of transmission lines for repelling birds, this article conducted stress experiments on various bird repellent spices, selected and compounded highly effective bird repellent spices; PVDF particles were used as the main carrier material, and dry-wet phase conversion technology was adopted. Supplemented by various functional agents, we have researched and developed a new type of high-efficiency solid bird repellent with slow release, weather resistance and long-term effect. The real-time monitoring results show that the bird repellent has a strong odor and has an obvious repellent effect on birds. It can prevent the birds from approaching the iron tower containing the bird repellent or even returning to the nest. It is environmentally friendly, efficient and long-lasting, easy to install and use, good weather resistance, etc., superior to the existing similar bird repellent products used in the power system, and meets the bird repelling requirements of the power system.
Research on the Hydropower Coupling-Based Hydropower Station Scheduling Optimization Model
Authors: Liming XIA , Yanmei ZHU , Chunyang LAI , Weibin HUANG , Shijun CHEN , Jinlong WANG 
Published: August 2021

Abstract
In order to improve hydropower availability and give full play to its power generation capacity, it is of great significance to set up a feasible and efficient scheduling optimization model. Based on the hydropower output match relation, the coupling factor and coupling are put forward. These two notions will be taken as the restriction condition. The hydropower station scheduling optimization model has been established by taking the minimal deviation of fulfillment of sales objective as the target function. Based on example of Dagangshan hydropower station in the Dadu River area, the model algorithm of particle swarm optimization algorithm is used for validation. According to the empirical study, the model doesn't produce discarded water during power generation, compared with the comparison schedule. Besides, it has more daily power output and smaller deviation of daily sales target power generation, which can effectively guide the economic operation of Dagangshan hydropower station.
Simulation calculation and analysis of energy-saving and efficiency-increasing of thermal power plants reform project
Authors: Li Lin , Gao Yan , Dou Huawei , Luan Tao , Cao Qing , Li Yanteng 
Published: August 2021

Abstract
Taking the third stage of National Energy Group Shengli Power Plant project as an example, the application effects of a number of hybrid transformation measures on the heat consumption of steam turbines were calculated, and the heat consumption of the unit was used as the characteristic value to compare the energy-saving benefit of various transformation measures. The results show that, there is a positive correlation between back pressure optimization and other energy-saving transformation measures, which can enhance the efficiency improvement effect of joint transformations. Among the three and four retrofit measures, data verification found that the ranking of the heat consumption benefits caused by individual retrofit measures: back pressure optimization retrofit> full cylinder efficiency retrofit> waste heat utilization retrofit> low pressure cylinder efficiency retrofit> medium pressure cylinder efficiency improvement transformation> high pressure cylinder efficiency improvement transformation> external steam-cooling transformation.
Research on Energy Storage and Hydrogen Production System of Offshore Wind-solar Hybrid Power Generation Based on 3D Finite Element Method
Authors: Wenli Li 
Published: August 2021

Abstract
At present, hydrogen, as a fuel, has the characteristics of high efficiency and no pollution, which can replace traditional fossil energy and be used in various fields to a certain extent. Using clean energy such as wind and light to electrolyze water to prepare hydrogen can realize zero pollution in the whole process from hydrogen preparation to use. Such energy conversion and use can reduce air pollution, improve air quality and solve the problem of abandoning wind and light. In this paper, a simulation model is established by using threedimensional finite element method, and meteorological parameters are input into the model, so as to obtain the power generation, hydrogen production rate and the efficiency of converting solar energy, wind energy and electric energy into hydrogen energy under different capacity configurations of each part of the system. Using the model established in this paper, the parameters of wind and solar energy resources, environmental factors and load power in different regions are input. By changing the battery capacity, observing the battery operation and DC bus output, the battery equipment suitable for the whole system can be selected.
Capacity Optimization and Maintenance of Low Voltage Reactive Power Compensation Equipment in Distribution Netw
Authors: Liu Yunsong , Chen Xiaolei , Hu Weihua 
Published: August 2021

Abstract
Low-voltage distribution network has the characteristics of large number of nodes and branches, radial network and three-phase asymmetry in normal operation, which directly affects the power quality of users. In this paper, the load variation, the three-phase asymmetry and the capacity attenuation of capacitors are considered, and the state evaluation and three-phase capacity planning of LV reactive power compensator are studied. Genetic algorithm is used to realize economical and efficient control effect of bus voltage stability through reasonable planning of finite compensation equipment in multi-node system. Experimental results show that the proposed method can effectively optimize the location and capacity of the compensation device, and can improve the overall voltage level of distribution network economically and reasonably.
Risk Assessment of Wind Swing Flashover of Transmission Lines Based on Matter-Element Extension Model
Authors: Yin Xiaobei , Xu Xianglian , He Yu 
Published: August 2021

Abstract
In extreme weather, the line trip-out events caused by the wind swing of the transmission line occur frequently, severely affecting the normal operation of the power system. Since the structure of the operating transmission line is difficult to be improved, wind swing flashover risk assessment is of great significance for the operating transmission lines. In this paper, a transmission line wind swing flashover risk assessment model based on the matter-element extension model is proposed. The analytic hierarchy process (AHP) and entropy weight method are applied to comprehensively calculate the weight value of the selected assessment index. This model can assess the early warning level of a certain tower unit in the transmission line. Finally, the feasibility and effectiveness of the proposed assessment model are verified by practical examples.
Study on 10kV Line Characteristics Based on Medium Voltage Carrier
Authors: Li Yongbin , Chen Wenjun , Yu Tao , Qi Minglu , Zhang Wang , Li Liang 
Published: August 2021

Abatract
Using medium voltage carrier communication to achieve full coverage of power information acquisition and distribution automation has become a hot spot in the domestic power industry. The characteristics of 10kV line will largely affect the reliability of medium voltage carrier communication, but due to the influence of voltage level and other factors, the research on 10kV line characteristics is not mature. In this paper, a research method of 10kV line characteristics based on medium voltage carrier is proposed. The improved medium voltage carrier communication machine and coupler can realize the collection of 10kV line impedance, attenuation and noise, accumulate useful data for the long-term study of 10kV line characteristics, help to improve the reliability of medium voltage carrier wave communication and assist 10kV line fault monitoring.
Analysis of solar interference simulation test for flame detectors
Authors: Zhong Chen , Liu Shen , Shao Yu , Xu Xiaoxiao 
Published: August 2021

Abstract
The light interference is an important reason for the false alarm or blindness of the flame detectors, and the effect of sunlight interference is particularly significant. In order to meet the requirements for the evaluation of the anti-sunlight interference performance of the flame detector, it is necessary to classify the solar interference severity according to the light climate data. On this basis, the solar interference simulation equipment and test method with quantitative test are designed. Through tests under different seasons, times and light conditions, the reliability and effectiveness of the test equipment and test methods are verified, the measurement uncertainty is calculated. Test results provide technical support for the standardization of sunlight interference test.
Research on the thermal performance of SAC-HVIW system under the influence of solar transmission and local radiant heater
Authors: Zhou Jiri , Yu Tao , Lei Bo , Zheng Jiacheng 
Published: August 2021

Abstract
Solar air collector (SAC ) combining with hollow ventilated interior wall (HVIW ) system is a new type of energy-saving and environmentally friendly heating system. In engineering applications, it will be affected by solar transmission and local radiant heat sources (external heat gain), but these factors have not been considered in previous studies. In this paper, the series connection of HVIW simplified heat exchange unit model is used to improve the original thermal network of the SAC-HVIW building, and experimental verification is carried out. Results show that the temperature deviation of the air cavity and the wall surface calculated by the model are all within 10%, which can be used for the external heat gain calculation of HVIW. Then, in order to research the influence of the intensity of external heat gain and the position of action on the thermal process of HVIW, seven cases of simulation calculation were designed. Results show that when the external heat gain is the same but the acting position is different, it has little effect on the minimum and fluctuation of the indoor air temperature (all within 0.1°C). However, the change of external heat gain has obvious influence on the minimum temperature. When the external heat gain of cases are 136W and 900W, the corresponding minimum temperature are about 0.5°C and 3.5°C higher than the cases of 82W, respectively.
Simulation of Axial Flow Left Ventricular Assist Device’s Control Algorithm Used to Assist Different Levels of Heart Failure Based on the Circuit Model
Authors: Wang Houfu , Zhang Yunpeng , Wu Xiangyu 
Published: August 2021

Abstract
Modelling blood circulation is difficult. Due to the similarity of blood circulation and circuit loop, a numerical model coupled with the cardiovascular system and the left ventricular assist device is used to study the control algorithm of left ventricular assist devices in this study. According to severity, heart failure can be divided into three levels, and is simulated by varying the time-varying capacitance. Most of the left ventricular assist devices adopt the control algorithm of constant speed, which can reduce the pulsation of aortic pressure, and it is especially obvious in level III heart failure. We compare the positive pulse mode and the constant speed mode, and the results show that the positive pulse could increase systolic blood pressure and reduce diastolic blood pressure, which is more in line with the human aortic pulsation, and is more suitable for patients with high level of heart failure.
An approach to the transformer core residual magnetism evaluation and demagnetization
Authors: Jiansheng Li 
Published: August 2021

Abstract
Aiming at the problem of transformer inrush current suppression, a method of transformer core residual magnetism evaluation and demagnetization is proposed. Firstly, by setting the amplitude and time of DC current, different transformer core residual magnetism states are obtained. Secondly, under different residual magnetism conditions, the high-voltage winding of the transformer is charged and discharged in the forward and reverse direction alternately. The current change data in the process is collected, and the correlation coefficient of the current data in the forward and reverse charging processes is calculated, which represents the transformer core residual magnetism states. Finally, the DC current with alternating change direction and gradually decreasing amplitude is applied at the high voltage winding to demagnetize, and the variation of residual magnetism is analyzed during the demagnetization process.
Analysis and Research on Power Systems Computer Aided Design for Yindong DC Transmission System
Authors: xiaoxiao Zhao , yuxin yun 
Published: August 2021

Abstract
The AC equivalent (Shandong power grid) model of inverter side is established by electromagnetic transient simulation method, and the real data of Yindong transmission frame of HVDC is set in PSCAD model. Shandong power grid has set up different centralized faults. Asymmetric circuit accident are the most serious among them. Based on this analysis, we come to the conclusion that the fault of Shandong electric power AC system has a greater impact on Yindong DC transmission system, which provides important guidance for the reliable operation of Yindong HVDC transmission model in the future. We think it has better theoretical reference value.
Research on Simulation Ideas of Relay Protection Device on Load Test Based on Virtual Reality Technology
Authors: Man Xiaoping , Duan Fengju , Piao Yongxin , Tian Rubing , Qiao Xuejing , Ji Xuanying , Liu Yu 
Published: August 2021

Abstract
Various problems may occur in the design and installation of transformer, busbar and line differential protection. Therefore, it is particularly important to carry out a load test when the corresponding protection is put into operation. This article introduces the research status of virtual reality technology and the necessity of load test, puts forward the load test methods and precautions, and proposes a simulation plan combining virtual reality technology and load test.
A Model-Driven Two-Degree-of-Freedom PID Controller with Manual/Automatic Switching Without Disturbance
Authors: Jian Yu , Lei Wei , Xingwang Zhao 
Published: August 2021

Abstract
The model-driven two-degree-of-freedom PID (MD-TDOF-PID) controller is an excellent controller with simple structure and easy parameter setting. However, the MD-TDOF-PID controller has a fatal disadvantage, which is disturbed in the manual/automatic switching in industrial control field applications. This paper designs a model-driven two-degree-of-freedom PID controller with no disturbance in manual/automatic switching. It has all the advantages of this controller and eliminates the shortcomings of disturbance in manual/automatic switching. The controller proved by simulation experiment that the control effect is better than the ordinary PID controller.
Power Plant Small-diameter Tube Phased Array Inspection Verification and Inspection Technology
Authors: Xin-ying LIU , Jun-long SU , Lei ZHANG , Xiao-yang SU 
Published: August 2021

Abstract
In this paper, the phased array inspection is carried out on the small diameter pipes with artificial groove defects and natural defects, and then the conventional ultrasonic inspection and the penetration inspection after cutting and dissection are carried out respectively. The ultrasonic phased array inspection results are compared with the conventional ultrasonic and compared with the results obtained from penetrant testing, the reliability of ultrasonic phased array testing technology in the application of small-diameter pipe testing is analyzed. Then, taking the detection of the small pipe socket of the high-temperature superheater header of Huadian Weifang Power Plant as an example, it is verified that the ultrasonic phased array detection is feasible in the detection of small diameter pipe welded joints. Finally, the ultrasonic phased array testing process and testing technology of power station boiler small-diameter pipes are summarized, and the development direction of phased array testing application in power plant equipment inspection is prospected.
Design of monitoring system for electric vehicle charging station based on LabVIEW and STM32
Authors: Liu Qian , Yan XiaoJin , Zhang LiPeng 
Published: August 2021

Abstract
Charging-station provides power supply for electric vehicles, which is a necessary and important energy supporting infrastructure for development and large scale commercialization operation of electric.For the current charging-station management is overly dependent on high-cost devices such as industrial computer, this paper develops a charger field test device, which adopts STM32 as the data exchange interface between the host computer and charger. The charge data is sent to PC through STM32, and the monitoring system development is designed by LABVIEW.This method optimizes the decoding of message content, overcomes the defect of over reliance on high cost components, and strengthenes the ability of bottom message collection, enhances the system intelligence.The communication is fast, reliable and has a good man-machine interface.
Time-domain coupling analysis of semi-submersible floating foundation with four buoys for offshore wind turbine and its mooring system
Authors: Rong Xueping , Dou Peilin , Chen Jianxin 
Published: August 2021

Abstract
Taking OC4 semi-submersible floating foundation design of offshore wind turbine as the research object, the mooring system of OC4 semi-submersible floating foundation with four buoys is designed according to its structural parameters. The calculation model is established by AQWA software to analyze the time domain coupling analysis results of the floating foundation and its mooring system under the action of wind, wave, and current to determine its mooring system. The results show that for the four buoy semi-submersible floating foundation, the catenary mooring system has more advantages in the positioning and motion control of the floating fan.