bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of Typical Faults and Defects and Testing Methods of Complete Set of Turns-Regulating Arc Suppression Coil
Authors: Xiang Yingzhu , Li Xin , Sun Qiuqin 
Published: April 2023

Abstract
In recent years, many automatic tracking compensation turns-regulating arc suppression coils have been installed in substations to compensate for the increasing capacitive current. However, the frequent occurrence of the fault defects of the arc suppression coil itself has caused a series of new problems, such as causing abnormal bus voltage at the low-voltage side of the substation. Through the analysis and classification of typical faults and defect cases of the complete set of turns-regulating arc suppression coil, it is found that the most vulnerable parts of the device are the on-load tap changer, damping resistance cabinet and control unit. Aiming at the problem that the detection means of the complete arc suppression coil device are insufficient, this paper proposes a new test method, including a compensation characteristic test and relevant accessories test. Based on the new test method, a simulation test platform was built to test 2 sets of turns-regulating arc suppression coil devices. The results show that the new test method has great application value.
Data cleaning method of distributed photovoltaic power generation based on clustering algorithm
Authors: Liao Liying , Liu Xinran , Wu Qiutong , Kang Liyan , Shang Ying 
Published: April 2023

Abstract
Due to China’s current energy development strategy, distributed photovoltaic (PV) power generation shows continuous growth. Since PV equipment greatly impacts the distribution network, achieving accurate monitoring of operational data is of greater significance. This paper firstly adopts k-means based clustering algorithm to cluster data into more small clusters and make full use of the characteristics of time series to achieve outlier determination; secondly, it proposes an abnormal data classification processing method to improve data utilization and data cleaning accuracy; finally, it interpolates and fills the rejected abnormal values to ensure data integrity and further improve PV power generation data monitoring.
Scheme design of brushless DC excess power generation system
Authors: Liu Yang 
Published: April 2023

Abstract
Brushless motors have the advantages of no brush, low interference, long life, and low maintenance costs, which are increasingly used in aviation power systems. According to the reliability requirements of the aircraft power generation system, this paper proposes a brushless DC excess power generation system scheme, which sends the alternating current generated by the main motor of the brushless DC generator to the AC/DC converter and primary power distribution, while retaining the main motor power generation converted into DC power through the internal rectifier circuit of the motor. The generator controller is designed with double surplus output to improve the reliability of the system power supply.
A Study on the Structural Characteristics of the Blades of Wind Turbines under Static Load Condition
Authors: Xu Lei 
Published: April 2023

Abstract
The study of the structural strength and stiffness of wind turbine blades is an important foundation and guarantee for analyzing the stability and reliability of the complete wind turbine. By analyzing the results of static load experiments and finite element calculation, the stress, strain and deflection of blades can be more precisely determined so as to assess the structural characteristics of blades. We conducted static load tests on the medium-size experimental blades developed by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, and obtained the deflection conditions of flap-wise and edgewise bendings, as well as the analytic results on the strain of the main beams and trailing edges. Meanwhile, a finite element model of blades was built using ANSYS to analyze the maximum deformation, stress, and strain. The corresponding results were compared with those of static load experiments. Then the strain and bending properties of blades under the static load were investigated, and the characteristics of the safety application of blades were verified. The results show that: 1)Within the range of 100% design load, the deflection of edgewise and flapwise directions presented a linear relationship with the applied loads. 2) After the loads in the flapwise direction exceeded 100% design load, a non-linear relationship between the blade bending and the applied loads were found. 3)The blade beam and trailing edge retain good stiffness properties under big strain conditions, and the maximum deformation appeared at the maximum chord length of the trailing edge of the blades. Our results on the static load experiments were basically consistent with the finite element model simulation, which verified the accuracy of the results of the static load experiment and finite element simulation of blades.
A Complex Affine Distribution Power Flow Considering the Power Correlation of Distributed Photovoltaic Generations
Authors: Zhang Jianmin , Li Shangang , Qi Zhanhua , Wang Zhitao , Shi Haiqing , Xue Feng 
Published: April 2023

Abstract
As the development of distributed photovoltaic (PV), the power flow distribution and the voltage level of the distribution network change dramatically, which increases the difficulty and complexity of the distribution network regulation. In this paper, a complex affine distribution power flow considering the power correlation of distributed photovoltaic generations is proposed, which improves the accuracy and effectiveness of power flow calculation of the distribution network. Firstly, the k-means clustering algorithm is used to divide the distributed photovoltaic into several clusters, and the complex affine model of distributed generations (PVs) and energy storage system (ESS) is established. The forward-backward sweep power flow based on the complex affine arithmetic is used to solve the problem. Compared with other algorithms, the completeness and accuracy of the proposed algorithm are verified. Two different scenarios are formed by establishing the complex affine power model of the energy storage element before and after accessing ESS. By comparison, the effect of energy storage on the reduction of distributed PV fluctuations is verified.
Research and Development of Automatic Test Equipment for Oil Varnish Propensity Rating in Electric Power
Authors: Hu Xuechao , Xue Shouhong , Sun Liqiang , Liu Jiang 
Published: April 2023

Abstract
This article introduces the research and development of transformer oil automatic varnish propensity rating test equipment based on membrane patch colorimetry (MPC). The equipment can automatically complete all the working links of the varnish propensity rating test process like transformer oil sampling, sample maturation, dissolution filtration, color difference detection and calculation, saving a lot of manpower and material resources, improving detection efficiency, and promoting the application of varnish propensity rating to evaluate the state of transformer oil, provide technical support for transformer safety detection.
Calculation and test analysis for power frequency electromagnetic field of transmission line crossing agricultural greenhouse area
Authors: Fang Ming , Li Tianchu , Wu Zhipeng , Wei Ning , Rong Bin 
Published: April 2023

Abstract
To assess the electromagnetic environment (EME) of high-voltage AC transmission lines (TLs) across agricultural greenhouses (AGs), a program that can calculate the power frequency electromagnetic field (PFEMF) under various AC TLs is compiled based on the principle of the simulated charge method and the simulated current method, and the power frequency electric field (PFEF) and magnetic field (MF) strength of AGs are calculated and compared with the field measurement results. The results show that the field measurement values of PFEF intensity and magnetic induction intensity in AGs do not exceed the standard requirements of 10kV/m and 0.1mT. The existence of AGs has a certain influence on the electric field (EF) distribution, but has little influence on the power frequency magnetic field (PFMF). For the PFEF and PFMF in AGs, the numerical calculation results are basically consistent with the field measurement results. The above results provide a reference for the EME assessment of high-voltage AC TLs across AGs.
Influence of phase sequence arrangement on the electromagnetic environment of four-circuit AC line on the same tower
Authors: Li Tianchu , Wu Zhipeng , Liu Yuanhuang , Liu Hongyan , Fang Ming 
Published: April 2023

Abstract
The paper predicts the power frequency electric field (PFEF), audible noise (AN), and radio interference (RI) of double-circuit 220kV and double-circuit 110kV four-circuit lines on the same tower erected on the same tower through the numerical calculation method of electromagnetic environment (EME) of AC transmission lines (TLs). Through a typical tower structure, the influence of the phase sequence (PS) on the EME is analysed, and the optimal and worst PSs are obtained. The optimal PS can significantly improve the EME, especially with a good confinement effect on the electric field’s power frequency. In addition, it also focuses on analyzing the influence degree of PS when the phase spacing, conductor-to-ground height and layer spacing change and establishes the applicable range of the optimal PS.
The design and assembly research high voltage supercapacitor cell
Authors: Tu Dan , Xu Jianhua 
Published: April 2023

Abstract
In this paper, the boron (B) and nitrogen (N) are added into carbon (C) structure named BCN. The BCN was used as electrode materials in supercapacitor cell, which shows good performance in electrochemistry test. The research results show that the performance of the BCN based-supercapacitor can be up to 806.1 mF at current density of 3 mA in KOH electrolyte. Besides, the capacity of supercapacitor cell in DLC301 electrolyte can be up to 782.9 mF at current density of 5 mA and the voltage increases to 2.7 times compared with KOH electrolyte.
Research and Optimization on the Factors Influencing the Emission and Speed Jitter of GDI Engine Catalytic Converter Heating Conditions
Authors: Ma Xiang 
Published: April 2023

Abstract
The case study shows the process of emission and engine speed oscillation optimization of the Borgward project with engine G01, GDI, transmission 6AT, and EU5 standards. A series of methods were adopted during the optimization process, including catalyst-heating idle speed, fuel rail pressure, ignition angle, exhaust VVT position, angle injection beginning 1st of suction stroke injection in the HSP during catalyst heating (SOI), end angle of 1st injection in hp2 while catalyst heating (EOI), split factor HP2 injection compression stroke during catalyst heating, the maximum time for active catalyst heating, etc. Finally, the emission result reaches the target, and the engine speed oscillation is optimized.
Study on the Adaptability of the Model of the Steam Turbine Speed Governing System under the Working Conditions of Deep Peak Regulation
Authors: Zhu Longfei , Xie Changya , Zhang Teng , Si Paiyou , Liu Shuangbai , Mei Long 
Published: April 2023

Abstract
At present, power system stability analysis model usually adopt the BPA model, which is provided by the PSD-BPA Transient Stability Program User Manual, and the model parameters are usually obtained from the measured data of 80% or more typical working conditions. With the expansion of load operating interval after retrofitting the flexibility of thermal power units, whether the model parameters can accurately simulate the response changes of the power system under the working conditions of deep peak regulation, that is, the model adaptability under the working conditions of deep peak regulation needs to be further studied. In this paper, the measured data of a 660MW subcritical unit under the working conditions of deep peak regulation was simulated and identified through the model. After the analysis of the simulation results, it was found that the model parameters under the working conditions of deep peak regulation greatly deviated compared with those under typical working conditions, so the model’s adaptability was poor.
Research on Live overhaul Method and Equipment for V-hanging Insulator String of Medium Phase Bridge Shape Cross Bear in 500kV Transmission Line
Authors: Xu Li , Li Zhihui , Wang Peng , Yang Yun , Liu Kan , Wu Zhitian , Luo Changhong , Guo Wenbin , Wei Yi 
Published: April 2023

Abstract
Ultra-high voltage (UHV) transmission lines are important for electricity transmission. Medium phase bridge shape cross bear is a special structure; No tool can be used to replace the V-hanging insulator string with live power. In view of this problem, the live overhaul method of V-hanging insulator string of medium phase bridge shape cross bear in 500kV transmission line is invented, the security is analyzed, and the developed equipment is simulated and tested. The results of the research show that it can meet working conditions and accelerate working efficiency, which is important for the kind of maintenance.
A DC Estimation Method to Improve the Accuracy of DC Power Flow
Authors: Yi Lin , Yuchen Tang , Wentao Zhang , Ruipeng Guo , Wei Wu 
Published: April 2023

Abstract
The DC power flow(DCPF) method greatly simplifies the process of power flow calculation compared with the AC power flow(ACPF) method. However, when the DCPF method is applied in the larger power system, its calculation deviation will be larger due to a mass of total active power loss of the system. It will be difficult to meet the requirements of the actual applications in the grid. By using ACPF as the measured values, a DC state estimation method is proposed here to correct the parameter of the DCPF model. The case study in the actual grid proves that this method can significantly relieve the calculating deviation of the DCPF method. Meanwhile, the method can effectively improve the calculation speed and better meet the accuracy requirements of practical grid applications.
Research on Data Acquisition Technology of Intelligent Laboratory Based on Retinex-Net Image Recognition
Authors: Ye Li , Wei Wei , Wang Yingchun , Guo Yue , Yu He , Wang Yalan 
Published: April 2023

Abstract
The reliability of electric power metering verification data is related to the accuracy and fairness of electric power trade settlement. Most of the existing verification equipment uses traditional pointer-type electrical verification instruments. The verification process requires the manual recording of data and the issuance of verification reports. There are problems such as low data collection efficiency, high error rate, and human tampering, which lead to great uncertainty in the detection results. This paper presents a data acquisition technology of pointer-type electrical verification instruments based on Retinex-Net image recognition for power metering verification data acquisition of intelligent laboratory, which realizes automatic data acquisition of power metering verification, ensures the accuracy and reliability of verification results, and effectively supports the digital transformation and development of power metering verification field.
Biomass Entrained Flow Gasification Technology and CFD Numerical Simulation
Authors: Ge Zhihong , Zhou Quan , Xu Litong , Qi Yunfei , Ma Dong , Jiang Congbin , Ding Jianping , Zhang Wenbin 
Published: April 2023

Abstract
Aiming at the dry pulverized biochar fuel refined by thermochemical conversion technology, its properties were obtained through experiment. By blending 5% additives to improve the ash fusion characteristics of biomass particles and considering the viscosity-temperature characteristics and the matching principle of CO2 reaction activity, the entrained flow gasification technology scheme of biomass particles was formulated. Based on the gasification reaction kinetics of dry pulverized biochar, a numerical simulation model was established to predict the flow characteristics, syngas composition, and particle conversion process in the gasifier. The results show that under the swirling entrainment and centrifugal force, the oxidizing reaction of particles is completed in the upper part of the gasifier quickly after mixing with oxygen. And the gasification reduction reaction occurs in the recirculating area and the pipe flow area. These effectively complete the conversion of char. The simulation results are in good agreement with the equilibrium calculation values, which proves the feasibility and rationality of the biomass particle entrained flow gasification technology scheme based on the HT-L.
Research on 3D Shape Monitoring System of Submarine Cable
Authors: Zheng Xinlong , Lu Zhifei , Chen Tieyi , Lei Zhichu , Li Yuan 
Published: April 2023

Abstract
Submarine cables have been used for more than one hundred years, while they have been widely used in recent decades. Safety has always been an issue with submarine cable applications because of their fast expansion. Submarine cables are more susceptible to operational risks and failure than terrestrial cables. Once the submarine cable malfunctions, it will bring huge inconvenience to production and life, which will cause huge economic losses. Therefore, it is very necessary to quickly locate the fault point of the cable and complete the emergency repair work. This article provides a 3D monitoring method for submarine cables, with a simulation monitoring system built in the laboratory to verify the method’s feasibility.
Research on MPPT control strategy based on the Perturbation observation method
Authors: Lv GuanXi , Bai Di 
Published: April 2023

Abstract
About traditional disturbance observation of larger changes in the external environment, the need for successive change step length, thus slow convergence speed of the shortcomings, based on traditional disturbance observation method, will be the main factors influencing the photovoltaic battery power curve (temperature, light intensity) is introduced into the control strategy of, when external conditions change dramatically, the method can directly reach the optimal duty ratio near, in this way, the slow convergence speed of the traditional perturbation observation method is effectively improved, and the dynamic tracking performance is optimized. In Matlab/Simulink, the improved control strategy model is built to verify that the improved control strategy can significantly improve the convergence speed and efficiency of the photovoltaic power generation system under the working condition of large changes in temperature and external illumination intensity.
Analysis of the Route Selection of HVDC in the Yangtze River Delta Load Center under the Background of the New Power System
Authors: Song Tianli , Wang Shihao , Qi Yuchen , Qiang Yumeng , Liu Ziqiu , Zhang Shuangbao , Xia Kai , Yu Xuan 
Published: April 2023

Abstract
As the load center in East China, the receiving-end power grid in the Yangtze River Delta is densely distributed with conventional DC and faces great security and stability risks in the context of the development of dual-carbon and new power systems. Based on the existing problems in the Yangtze River Delta power grid, this paper draws up different DC technology routes and compares and selects them based on the safety and stability support capabilities and reactive power support capabilities of the receiving-end power grid, the impact on the short-circuit current of the system, technology maturity, land occupation, and economy, and finally put forward the recommended technical route for a foreign power to enter Shanghai.
Optical characterization of lithium fluoride thin-film imaging detectors for monochromatic hard X-rays
Authors: Vincenti M.A. , Montereali R.M. , Nichelatti E. , Nigro V. , Piccinini M. , Koenig M. , Mabey P. , Rigon G. , Dabrowski H.J. , Benkadoum Y. , Mercere P. , Da Silva P. , Pikuz T. , Ozaki N. , Makarov S. , Pikuz S. , Albertazzi B. 
Published: April 2023

Abstract
Lithium fluoride (LiF) crystals and thin films have been successfully investigated as X-ray imaging detectors based on optical reading of visible photoluminescence emitted by stable radiation-induced F2 and F+
3 colour centres. In this work, the visible photoluminescence response of optically-transparent LiF film detectors of three different thicknesses, grown by thermal evaporation on Si(100) substrates and irradiated with monochromatic 7 keV X-rays at several doses in the range between 13 and 4.5 × 103 Gy, was carefully investigated by fluorescence optical microscopy. For all the film thicknesses, the photoluminescence response linearly depends on the irradiation dose in the investigated dose range. The lowest detected dose, delivered to the thinnest LiF film, only 0.5 μm thick, is estimated 13 Gy. Edge-enhancement imaging experiments, conducted by irradiating LiF film detectors at the same energy placing an Au mesh in front of them at a distance of 15 mm, allowed estimating a spatial resolution of (0.38 ± 0.05) μm, which is comparable to the microscope one. This very high spatial resolution in LiF film radiation detectors based on colour centres photoluminescence is combined with the availability of a wide field of view on large areas.
Design of artificial neural network hardware accelerator
Authors: Kuznar Damian , Szczygiel Robert , Maj Piotr , Kozioł Anna 
Published: April 2023

Abstract
We present a design of the scalable processor capable of providing an artificial neural
network (ANN) functionality and in-house developed tools for automatic conversion of an ANN model
designed with the TensorFlow library into an HDL code. The hardware is described in SystemVerilog
and the synthesized module of the processor can perform calculations of a neural network with the
speed exceeding 100 MHz. Our in-house designed software tool for ANN conversion supports
translation of an arbitrary multilayer perceptron neural network into a state machine module,
which performs necessary calculations. It is also dynamically reconfigurable so that the ANN
operating on the hardware can be changed after it is deployed as an ASIC. The project aims the
in-pixel implementation towards an X-ray photon energy estimation. The energy estimation shall be
delivered with accuracy that exceeds the accuracy of an ADC converter that feeds the ANN with data.
Study of hybrid micropattern gaseous detector with CsI photocathode for Super Tau-Charm facility RICH
Authors: Li Ping , Chen Shiping , Liu Qian , Zhang Zhiyong , Wang Anqi , Feng Jianxin , Hou Baolin , Liu Hongbang , Zhao Lei , Shao Ming , Liu Jianbei , Zheng Yangheng 
Published: April 2023

Abstract
Super τ-Charm facility (STCF) is a future electron-positron collider operating in the
τ-Charm energy region with the aim of studying hadron structure and spectroscopy. The
baseline design of the STCF barrel particle identification (PID) detector, which covers momentum
up to 2 GeV/c, is provided by a Ring Imaging Cherenkov Counter (RICH). The RICH features an
approximately focusing design with liquid perfluorohexane sealed in a quartz container as the
radiator and a hybrid combination of CsI-coated THGEMs and Micromegas as the photo-electron
detector. A 16×16 cm2 prototype with a quartz radiator has been built and tested at
DESY and stably operated with an effective gain of 105. In this paper, the design,
performance, and reconstruction algorithm of RICH detectors are discussed.