bluuebunny/crossref_metadata_2025_split huggingface dataset:
Output control of wireless power transmission system based on dynamic parameter tuning
Authors: Xu Benchao , Wang Zhihui , Shi Ke , Long Hao , Tang Chunsen 
Published: February 2021

Abstract
Flexible output power control is very important for wireless power transmission system. In the wireless charging application of electric vehicles, the load is usually the battery. For the battery, both constant current charging and constant voltage charging are needed. In the constant voltage stage, the current should continue to decrease, so we need to adjust the output current of the system in the later stage of charging. Nowadays, the main methods used in WPT system are phase shift and pulse width modulation, adding a first stage DC-DC circuit before the inverter, and controlling the energy injection of the transmitting coil. In view of its shortcomings, this paper uses a method based on adjusting capacitor parameters to achieve output control. Firstly, the influence of capacitance parameters on output current is analyzed, and the relationship between capacitance parameters and output current is deduced; secondly, its advantages are analyzed, and the working principle is analyzed through simulation; finally, the feasibility and correctness of the control method are verified by experiment and simulation.
Design of Wind Farm Information System Based on Blockchain Technology
Authors: Wang Haitao , Wu Bin 
Published: February 2021

Abstract
The current wind power operation and maintenance management has difficulties in data storage, insufficient security, and weak sharing. Therefore, this paper proposes to use the blockchain to build a wind farm information system to solve these problems. This paper analyzes the applicability of blockchain and wind farm information system, and designs the functional modules of the wind farm information system and the corresponding system framework.
Application of Error Function in Dead-end/cross-flow Microfiltration Mode
Authors: Hu Ge , Zhong Chenyin , Wang Zhan , Wang Xi 
Published: February 2021

Abstract
In this study, error function was used to analyze the membrane fouling behavior (flux decay) for bovine serum album (BSA) solution in dead-end mode and for kaolin suspension in cross-flow mode under constant pressure. The results showed that the predictions of error function had good agreements with experimental data both in dead-end mode and cross-flow mode. Meanwhile, both higher concentration and higher TMP could accelerate the membrane fouling rate. In addition, the parameter k in error function decreased with the increase of concentration or TMP. Thus, smaller parameter k represented more serious membrane fouling.
Prediction method of coal mine goaf temperature and its practical application
Authors: Xinhai Zhang , Hui Zhu 
Published: February 2021

Abstract
Spontaneous combustion of coal seams in goaf seriously threatens the development of the coal mining industry. The prediction of goaf temperature is of great significance for mine disaster prevention. Based on the energy conservation equation of floating coal in goaf, the analytical solution of the steady-state temperature field in goaf is derived in this paper, and the temperature of goaf can be calculated simply through a series of physical and chemical parameters. This method is applied to Kaida Coal Mine to calculate the temperature of goaf at the return air side of 46205 working face. The results show that although there is some error between the calculated value and the measured value of the temperature in goaf, the predicted results can reflect the change rule of the temperature in goaf, and provide some guidance for the prevention and control of coal spontaneous combustion in goaf. With the increase of buried depth, the floating coal temperature rises first and then decreases. It is estimated that the maximum temperature of goaf is 27.11 °C, which is located 25m deep in goaf.
A Two-Layer Optimization Model for Energy Storage Configuration in the Distribution Network
Authors: Ma Tianxing , Gu Hui , Zha Zhijun , Li Guoshun , Luo Honghao 
Published: February 2021

Abstract
The large-scale access of electric vehicles will aggravate the peak-to-valley load difference of the distribution network, and the intermittent power generation of high-penetration renewable energy also threatens the safe operation of the distribution network. Energy storage is widely used in the fields of power peak load shifting and access of renewable energy. This paper proposes a two-level optimization model that considers both planning and operation of energy storage system. At the planning level, a method for the location and capacity of energy storage is proposed based on the economics of the distribution network. At the operation level, a scheduling strategy applying to different seasonal scenarios is proposed to achieve the best effect of peak load shifting. The simulated annealing particle swarm algorithm with good convergence performance is used to solve the model. Finally, the performance and economic benefits of the model are demonstrated through simulation research.
Research on the Impact of Xiamen VSC-HVDC on the Short-circuit Current Level of the Power Grid and the Suppression Measures
Authors: Su Qingmei , Huang Ting , Li Kewen , Zhang Huiyu , Huang Daoshan , Lu Yingquan 
Published: February 2021

Abstract
After Xiamen VSC-HVDC Project is put into operation, it can improve the power supply capacity and reliability of Xiamen Power Grid.But at the same time,it also brings new problems to the operation of the power grid, among which the short-circuit current problem is particularly prominent.In the preliminary analysis of power grid operation, using the short- circuit current program (PSD-SCCP) commonly used in domestic power grid simulation analysis to calculate to be found that:VSC-HVDC will provide a large short-circuit current when the AC grid is short-circuited, causing the short-circuit current levels of multiple 220kV busbars of the Xiamen Power Grid to approach or exceed 50kA, which brings greater pressure on the adjustment and arrangement of the grid operation mode.Therefore, it is necessary to study the true level of the impact of Xiamen VSC-HVDC on the short-circuit current of the AC grid based on the actual control logic of the Xiamen VSC-HVDC project, in order to propose more accurate short-circuit current suppression measures to achieve bipolar operation of Xiamen VSC-HVDC.
The Application of Digital Twin on Power Industry
Authors: Huang Jianping , Zhao Linlin , Wei Fuwang , Cao Bingwen 
Published: February 2021

Abstract
Digital Twin (DT), integrating some current popular technologies, such as smart sensors, 5G communications, cloud platforms and big data analysis, is an integrated multidiscipline, multi-physical, multi-scale and multi-probability simulation process. To promote the accelerated development of China's manufacturing industry, it is needed to develop a smarter new generation of Smart Power System (SPS), and it is time for DT’s emergence. This system can comprehensively improve the intelligence of grid operation by using DT, which is driven by the data stream generated by the smart grid. Besides, it uses real-time situational awareness and uses real-time virtual deduction as cognitive means, and real-time feedback from virtual space to real space as an iterative method. Based on the applications of DT in the power industry, this article analyzes some applications in power system control, equipment fault prediction and diagnosis, and power online analysis from the demand for the core technologies of DT and DT of power system intelligence. Thus, the design framework, core technologies and implementation approaches of the Power System Digital Twin (PSDT) are presented. Finally, the challenges faced by the applications of DT in the power industry are analyzed, and the future trend of the power of DT is summarized.
A failure analysis of a generator unit shutdown due to short circuit of generator positive and negative collector rings
Authors: Liu Shifu , Qian Zhunli 
Published: February 2021

Abstract
Taking the short circuit faults of the positive and negative collector rings of a 40MW gas turbine generator as an example, the failure process of the generator's positive and negative collector rings is analyzed, the process of failure occurrence is explained, and the cause of the failure is analysed, the main reason for the failure is that the air inlet filter of the collector ring chamber of the generator is damaged and falls off, and the broken and dropped filter screen enters the collector ring chamber with the wind, which causes a short circuit of the positive and negative collector ring. Finally, the corresponding treatment and preventive measures are formulated.
Research on key issues of power spot market construction
Authors: Guo Hongzhen , Li Tengjian , Xu Ming , Song Wenqin , Tuo Jianjun 
Published: February 2021

Abstract
Power spot market is the key link of the power market system. It plays a fundamental role in supporting the opening, competition and orderly operation of the power market. It is also the key to coordinate market transactions and system security.Based on the comprehensive comparison and analysis of the construction practice of power markets in different countries, this paper analyzes and studies the key issues in the organization and operation of the power spot market, such as market operation organizers and their responsibilities, market price and clearing mechanism, and puts forward some innovative suggestions for the construction of power spot market.
The effectiveness evaluation of system construction for compliance management in the electricity market
Authors: Jin Luosong , He Chang , Wang Xiangyang , Wang Miao , Zhang Lu 
Published: February 2021

Abstract
The establishment of a scientific and effective evaluation index system is essential for the healthy development of China’s electricity market. This paper focuses on the effectiveness evaluation of the system construction for compliance management. We propose a three-level index system of compliance management. Further, the weight of each index is measured by the weighting method for group decision based on AHP method. Finally, a modal analysis has been made to illustrate the suitability and effectiveness of the proposed framework. Some suggestions on compliance management are provided to ensure the sustainable development and promote the electricity market reform in China.
STUDY ON BOUNDARY CONDITIONS OF GROUND ANCHORED CABLE STAYED BRIDGE WITH SINGLE INCLINED TOWER
Authors: Zhang Yajun , Wang Xiaoshan , Liu Yahao , Li Ranran 
Published: February 2021

Abstract
In order to study the influence of boundary conditions at the bottom of the tower on the structural characteristics of a ground anchored cable-stayed bridge with single inclined tower, taking a bridge project as an example, the finite element model is established to study the static, dynamic and overall stability of three structural systems, namely, universal hinge connection, unidirectional hinge connection and consolidation connection, between the bridge tower and the concrete tower base. The results show that: The internal force can be reduced by universal hinge connection between tower bridge and tower base, and structural deformation can be reduced by choosing consolidation method. However, there will be huge torque and transverse bending moment at the bottom of tower, so the consolidation system should not be selected first; the dynamic characteristics of the three systems are different, but the dynamic characteristics of the main girder are basically the same. In terms of stability, the boundary conditions have little effect on the low-order instability modes of the structure, and the stability can be considered as the final factor of the structure selection.
Comprehensive optimization of distributed generation considering network reconstruction based on Archimedes optimization algorithm
Authors: Li Yingliang , Zhu Hao , Wang Deming , Wang Kang , Kong Weixu , Wu Xiaomeng 
Published: February 2021

Abstract
To mitigate the effect of the distributed generation (DG) connection on the voltage profile and power loss, the DG optimal configuration and network reconfiguration are used in distribution automation. In this paper, a new optimization method named Archimedes Optimization Algorithm (AOA) is proposed, unifying the DG optimal configuration and network reconfiguration. The DG locations and capacities are coded by integral and real numbers simultaneously in the proposed method. The integer mesh-network coding method is integrated into the new method to solve the network reconfiguration problem. The new method is compared with the Improved Genetic Algorithm (IGA) as well as the Particle Swarm Optimization (PSO). Results demonstrate that the proposed method has advantages in improving the voltage profile and reducing the power loss.
Research on Regional Difference of Energy Consumption in Production Stage of Civil Building Materials based on Theil Index
Authors: Yuefei Liu , Jing Liu 
Published: February 2021

Abstract
Total quantity control is an important means to achieve the goal of building energy conservation in China, but the statistical method of energy consumption data in the production stage of civil building materials has not been established yet. This paper firstly constructs the calculation method of energy consumption in the production stage of civil building materials according to the usage amount of building materials, and then obtains the data of energy consumption in the production stage of civil building materials from 2008 to 2017 according to the statistical yearbook. Then, 30 provinces and cities in China are divided into 3 regions. According to Theil index analysis method, the regional differences of the production energy of China's civil building materials from 2008 to 2017 are calculated. According to the calculation results, China's energy consumption in the production stage of civil building materials shows an overall trend of convergence growth, but the intra-regional difference is greater than the inter-regional difference. The Theil index is the highest in the western region, but the contribution rate of the Theil index is the largest in the eastern region.
Three-dimensional simulation analysis of electric field distribution at the middle joint of 110 kV cable with typical defects
Authors: Xu Siqin , Huang Xiangqian , Yang Song , Yu Bin , Gan Pengfei 
Published: February 2021

Abstract
The joint of high-voltage cable is the weakest part in the whole cable system, and the local defect of the middle joint will affect the distribution of the internal electric field. This paper establishes a three-dimensional model by finite element simulation software based on the electric field calculation equation in Maxwell equation system. The influence of typical defects such as impurity, scratch and air bubble on the electric field distribution in the middle joint is analysed. The results show that the internal defects of the middle joint may cause distortion of the local electric field strength in the middle joint, which may lead to deterioration of the insulation.
Analysis of the influence of control parameters on the interaction between direct-driven wind turbines
Authors: Xin Guifeng , Cao Na 
Published: February 2021

Abstract
In order to study the influence of control parameters on the interaction between direct-driven wind turbines, this paper presents the interaction model and analysis method of direct-driven wind turbines. Firstly, the harmonic linearization method is used to establish the interaction model of two direct-driven wind turbines, and the interaction mechanism between the two units is studied; secondly, the influence of phase-locked loop and DC voltage loop on the interaction between the two units is analyzed from the perspective of bandwidth and damping ratio of second-order closed-loop transfer function, and the interaction law of phase-locked loop and DC voltage loop on the interaction between the two units is studied and summarized; finally, the time-domain simulation of the two units grid-connected system is carried out, and the results are compared with the frequency domain analysis results to verify the rationality of the theoretical analysis.
Hydrodynamic and Structural Stability Analysis for Shaft Tubular Pump Unit
Authors: Yang Jianfeng , Fang Guocai , Hu Daming , Cai Zhizhou , Zhai Jianwei , Zheng Yuan , Kan Kan 
Published: February 2021

Abstract
Hydrodynamic and structural stability directly affect the efficiency and safety of pump units operation. In this paper, we simulated inner flow field of a shaft tubular pump unit through Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) for exploring the blade pressure and dynamic stress characteristics, where first part focus on the hydrodynamic pressure fluctuation on inlet and outlet of impeller and second part focus on dynamic stress distribution in time and frequency domain on pump impeller. Monitoring points are set at the inlet and outlet of impeller to obtain the dynamic pressure, then mapping the time domain data to frequency domain through Fast Fourier Transform (FFT) method. The results show that the pressure fluctuation has strong periodicity, and the fundamental frequency of the pressure fluctuation on the inlet and outlet surfaces is the blade passing frequency and the blade passing frequency respectively, which means the rotation of impeller and rotor stator interaction (RSI) phenomenon between impeller blades and guide vanes are the origin of hydrodynamic pressure fluctuation. Hydrodynamic pressure on impeller blade is applied to the impeller structure to obtain structural responses, results show that maximum dynamic stress appears in the root of impeller blade, the dynamic stress fluctuate in the nearby of static stress concentration and maximum dynamic stress appear in the permissible stress range. In frequency domain, the basic frequency and secondary basic frequency are impeller blade passing frequency and guide vane passing frequency, which indicated that the major reason of impeller dynamic stress fluctuation is water excitation pressure.
Application of Artificial Intelligence in Industrial Automation Control System
Authors: Li Qiyao 
Published: February 2021

Abstract
Automatic control system is an important part of industrial production and manufacturing. With the rapid development of computer technology, a new generation of intelligent technology represented by artificial intelligence has been applied to industrial automation system. This paper introduces the development of the current industrial automation control system in detail, and then describes the relevant theory of artificial intelligence technology. Finally, it describes the application of artificial intelligence technology in industrial automatic control system and its future development trend. This paper aims to provide a reference for the research of industrial automation control system.
Research on optimal Dispatching Strategy of micro-grid based on Particle Swarm optimization algorithm
Authors: Wang Ning , Li Hongtao , Zhang Qianmao , Shi Litao , Geng Xin 
Published: February 2021

Abstract
Optimizing micro-grid dispatch is one of the important ways to improve the efficiency of renewable energy utilization. In this paper, a micro-grid system, including photoelectric, wind power, diesel engine, and the battery is optimized based on the Particle Swarm Optimization algorithm. Constrained by operation condition, a multi-objective optimization scheduling model including fuel cost, operation cost, and pollution gas emission cost is established, and multi-objective Particle Swarm Optimization (MOPSO) is used to solve the optimization scheduling problem of micro-grid. The simulation results show that the model can promote the optimization of micro-grid dispatch.
Research on Fault Location Method of Distribution Network
Authors: He Xiangzhen 
Published: February 2021

Abstract
Distribution network is an important part of the power system, is the core link of power distribution, and is also the key node in the process of power grid operation. Once the distribution network fails, it is very important to determine the fault location quickly and accurately for the restoration of normal power supply. Aiming at the problem of distribution network fault location, this paper introduces the research status of distribution network fault location method in detail, introduces the existing distribution network fault location method in detail, expounds its application situation, analyzes the advantages and disadvantages of various methods in detail, so as to provide reference for the future research of distribution network fault location method.
Study on Influence of the use of energy on living condition
Authors: Chen Yang 
Published: February 2021

Abstract
Based on the important influence of the use of energy on environmental pollution, the evaluation index of the use of energy and living condition is selected, and the principal component analysis is used to measure the use of energy level and living condition degree in each region. The panel data of 30 provinces in China from 2011 to 2017 were selected to build a regression model to study the relationship between the use of energy and regional environmental pollution. The results show that the influences of different variables on living condition are different, the influences of the use of energy and population factors on living condition are positive, and the influences of scientific and technological water level on living condition are negative. On this basis, some countermeasures and suggestions are put forward to optimize the the use of energy structure, expand the scale of environmental governance investment, and give play to the leading role of the government.
Underground Intelligent Dry Dust Collector in the Coal Mine
Authors: Xu Jian , Wang Haiyang 
Published: February 2021

Abstract
Aiming at the problems of low dust removal efficiency, poor removal of respiratory dust, and serious waste of water resource, caused by underground wet dust removal device in heading face in the coal mine, and the promotion of coal mine mechanization, informatization, automation, and intelligent construction, we make the development of an intelligent dry dust collector working underground. We adopt new production process to develop the flame-retardant anti-static dust removal filter material without rolling points, which can increase the effective dust removal filter area by more than 20%, greatly reduce the size of the dust collector, and have a total dust removal efficiency of more than 99.5%. We apply automatic intelligent control technology to realize linkage with heading machine, automatic start and stop, intelligent cleaning, fault detection and alarm, and unmanned operation, and to support multiple terminal equipment access, so as to provide complete set of dry dust removal technical support for unmanned dig working face.
Optimal configuration of distributed generation based on sparrow search algorithm
Authors: Wang Hairui , Xianyu Jianchuan 
Published: February 2021

Abstract
Aiming at the problem of how to effectively configure distributed generation (DG) in the distribution network, an optimization configuration model of DG with the lowest total system operating cost as the objective function, system power flow, node voltage, branch current and distributed power capacity as constraints is established. In this paper, a new technique based on the sparrow search algorithm (SSA), is used to solve the optimal configuration model of DG for the first time. Finally, the IEEE 33 distribution system is used as an example to perform simulation, which verifies the rationality of the optimal configuration model and the effectiveness and superiority of the SSA, which can more efficiently solve the problem about optimal configuration of DG.