bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Optimization Research on Control Rule of Submersible Linear Motor Double-Acting Pump
Authors: Lu Jin-Jin , Zhong Xiao-Pu , Huang Ya-Nong , Yi Xiao-Jun 
Published: October 2022

Abstract
The paper takes one submersible linear motor double-acting pump as a research object. A relationship of linear motor output capability and its controls parameters is concluded by building a model. The oil production system control rule is researched by optimizing voltage, frequency and other control parameters. The results showed that a way by adjusting the output voltage and frequency can improve output capability of linear motor effectively and expand the oil production depth and application range of oil production system. Changing the maximum speed of the actuator through frequency has a great influence on the change of the maximum thrust required by the linear motor, because the change of speed has a great influence on the resistance along the path. The submersible linear motor double-acting pump oil production system is more suitable for deep Wells with less oil production.
A Review of Research on Transformer DC Bias Caused by HVDC Transmission
Authors: Zhao Guoliang , Qiao Guangyao , Yu Zhiyong , Chen Tian , Wang Yue 
Published: October 2022

Abstract
The construction of AC and DC transmission in China is accelerating. And the grid is getting closer, which will make the grid structure strong. However, the tightly connected power grid is more vulnerable to space weather and HVDC. Now, the researches on transformer DC bias were summarized, and the researching methods and achievements were analyzed. The main reasons and basic theory were introduced, and so did the influences to transformer. The method is generally to establish a corresponding calculation model through actual measurement, simulation and calculation, and limiting, isolating, injecting DC current are main restraining measures.
Research on grid-connected distributed generation considering relay protection
Authors: Li Yingliang , Sun Xiyao , Cai Heming , Liu Mengxi , Yang Yi 
Published: October 2022

Abstract
The access of distributed generation can cause some impacts on the distribution network, especially the change of the magnitude and direction of the short-circuit current may cause the relay protection device in the system to refuse or malfunction. Aiming at this problem, a mathematical model id founded in this paper, whose target is the maximum capacity of distributed generation. Besides normal constraints such as the node voltage and the total capacity, the current protection constraint is also taken into account. The genetic algorithm is used to optimize the capacity and location of the distributed generation in the IEEE33 bus distribution system model, and the obtained results verify the importance of taking into account the relay protection constraint.
Power grid practice of suppressing transient overvoltage of sending-end system by ultra high voltage direct current control parameters
Authors: Yang Mingkai , Li Yuanyuan , Fang Baomin , Zhang Xin , Chen Chunmeng 
Published: October 2022

Abstract
The transient overvoltage off-grid problem of new energy in the sending-end network has become an important factor limiting the ultra high voltage direct current (UHVDC) transmission capacity. In this paper, the causes of transient overvoltage during the DC fault process is analysed firstly, then from the perspective of adjusting the reactive power consumption of the converter, taking the Qingyu UHVDC project in China as an actual simulation example, the influence of the DC control mode and current control parameters at the rectifier side on the transient overvoltage is deeply studied. Combined with the transient voltage evaluation results of the actual power grid, guiding suggestions for DC control strategies are given to improve the transmission capacity. The research results have important reference significance for improving the consumption of new energy and the transmission capacity of UHVDC projects.
Research and application of deformation measurement method of hydraulic turbine head cover
Authors: He Liangchao , Deng Weiqi 
Published: October 2022

Abstract
Aiming at the deformation of hydraulic turbine head cover during operation, a non-contact eddy current sensor is proposed. In this method, the turbine pit wall is taken as the static reference point, a fixed support is erected on it, and the eddy current probe is fixed at the other end of the support. Measure the gap change between the eddy current sensor probe and the head cover to calculate the absolute deformation of the head cover. The effectiveness of the proposed method is verified by taking the lifting amount test of hydraulic turbine head cover in a power plant as an example. The results show that this method has the characteristics of simple test equipment, strong adaptability and high accuracy, and can be applied to the field test of hydraulic turbine head cover deformation.
Fixed-time Sliding Mode Control for Buck-Boost Converter
Authors: Zhou Yusheng , Liu Shilin , Wang Ning 
Published: October 2022

Abstract
To obtain stable state within the fixed time and reduce the influence of uncertain device parameters on the buck-boost converter, this paper proposes the fixed-time sliding mode control (FSMC) and fixed-time adaptive sliding mode control (FASMC). Firstly, we build the state-space average model on the basis of the continuous conduction mode (CCM) of the buck-boost converter. Secondly, the fixed-time sliding mode surface and FSMC are studied when the device parameters are known. By analyzing the Lyapunov stability, it has been proved that the system can reach a stable state within the fixed time, besides the maximum of the fixed time is merely determined by the parameters of the control strategy. Thirdly, when the system device parameters are unknown, the FASMC is developed ensuring the system can reach the adjacent domain of the equilibrium point within the fixed time. Finally, the effectiveness of the proposed control strategies was verified by the simulation experiments.
Voiceprint Feature Extraction of Large Power Transformers in Uninterrupted Diagnosis and Early Warning Technology
Authors: Wang Hua , Zhang Xiaoming , Zhang Xilun , Zhao haiduo , Wang Jingjing 
Published: October 2022

Abstract
Condition-based maintenance is to select the most suitable maintenance method according to the real-time operating state of the converter. Transformer condition evaluation and fault diagnosis is an important basis for condition maintenance, and it is also the key to ensure the normal implementation of condition maintenance. The main purpose of this paper is to study the application of voiceprint feature extraction in large-scale power transformers in uninterruptible power failure diagnosis and early warning technology. In this paper, a comprehensive and in-depth study of the state quantity of transformer uninterrupted detection is carried out. Experiments show that when CR<0.10, the matrix is satisfactory and consistent, and the weight distribution is reasonable.
Transformer Behavior Feature Identification and Analysis Technology Based on Acoustic Interference
Authors: Su Tao , Sun Haiyu , Guo Zhijia 
Published: October 2022

Abstract
At present, most of the researches are based on linear systems, whose convergence speed and steady-state error are irreconcilable, and in actual operation, nonlinear factors greatly reduce the control performance of linear systems. If the nonlinear problem in the system can be solved, the active noise reduction system can choose low-cost electroacoustic devices with nonlinear distortion, which can not only improve the noise reduction performance, but also has special significance for reducing the cost of the system. Therefore, the main purpose of this paper is to study the feature identification and analysis of transformers based on sound wave interference. This paper explores the propagation, absorption and radiation process of the vibration generated by the transformer core and winding in the surrounding space, and finally obtains the vibration and noise signals of the transformer body, as well as the air sound field distribution at a specific spatial Experiments show that, compared with before the noise reduction experiment, the mean value of the noise in each main frequency band is reduced by about 7dB after the noise reduction experiment.
Design of gas drainage pipe network regulation and control system based on PLC
Authors: Wang ZuXun 
Published: October 2022

Abstract
In order to improve the regulation efficiency of the coal mine gas drainage pipe network, reduce the labor intensity of workers, and ensure the safe production of coal mines, a gas drainage pipe network regulation and control system is designed. The system adopts Siemens S7-1200 series PLC as the core control unit of the gas drainage pipe network. Through the explosion-proof treatment of the PLC control box, it meets the special requirements of PLC used in the coal mine environment. Through the design and selection of flow sensors and methane sensors it improves the flow and methane sampling accuracy of the gas drainage regulation system. By writing local control strategies and remote control strategies in PLC, the automatic regulation of the gas drainage pipeline network is realized.
Delay Correction for Pre-Breakdown Phase of Subsonic Stream Discharge in Water
Authors: Gao Chong , Kang Zhongjian , Zhang Xianghai 
Published: October 2022

Abstract
Shock waves generated by streamer discharge in water have huge application value to improve unconventional reservoirs. In this paper, experiment platform for high-voltage pulse discharge in water, which beneficial to research the pre-breakdown phase of subsonic streamer discharge in water of high-frequency discharge application scenarios is established. The mechanism of stream discharge and the importance of polarization process were analysed by high voltage theory. The initial time of flow column development was determined based on the time-varying characteristics, and the time of pre-breakdown phase was corrected by using the lightning shock intercept analysis theory. The results show that the polarization process should be incorporated into the pre-breakdown phase. Meanwhile, the initial development time of the flow column is the 3μs of the experimental data. After modification, the polarization process is shortened by 0.9372μs and the delay correction ratio is 24.57% after modification.
Study on the influence of casing heat transfer enhancement
Authors: Yang Xin , Wang Jingyue , Lei Jindong , Wang Fei , Cheng Kaifeng , Wang Xingfu , Liu Hongjiao 
Published: October 2022

Abstract
Heat transfer is one of the most common unit operations in industrial production. In this paper, the variation law of heat transfer coefficient of smooth tube heat exchanger and tube heat exchanger with spiral coil at different flow rate is discussed by experiment and numerical simulation, and the corresponding correlation formula of convective heat transfer criterion is fitted. This has certain reference significance to improve the heat transfer efficiency of heat exchanger to reduce the energy consumption of the country and improve the design of heat exchanger structure.
Active Power Filter LCL Filter Novel Interface Control Scheme Analysis
Authors: Wu Ke , Jiang Yunhao , Li Ruoxuan 
Published: October 2022

Abstract
Shunt active power filter (SAPF) has been widely used in active distribution network system. Improving the compensation performance of SAPF has become the focus of many scholars. The traditional filter interface usually adopts series resistance. In order to reduce the loss of damping resistance and ensure the compensation performance of SAPF, a new type of passive interface is adopted, and the double-loop control scheme of PI control combined with repeated control is adopted. By comparing the difference of the selected points of different feedback currents, when the feedback current is taken from the inverter, only a small damping resistance is needed to achieve good steady-state accuracy. Simulation results verify the correctness and effectiveness of the proposed scheme and the system feedback current selection method.
Design and Simulation of hydraulic system of The deep-sea miner
Authors: Song Wentao , Zhang Yan , Zhu Xiaojun , Zhao Ge , Xing Keli 
Published: October 2022

Abstract
The hydraulic system of the deep-sea miner is designed, the control model of the hydraulic system is established, the control effect of the conventional PID controller and the fuzzy PID controller on the suspension system is compared and analyzed, and the stability of the hydraulic system is simulated and analyzed.
Close-range Hot Spot Detection based on K-neighbor Algorithm and Experiment on Hot Spot Effect
Authors: Na ZhiXiong , Wang Dong , Wang ZiYue , Wang Jian , Tang Yu , Zhang ZiHan 
Published: October 2022

Abstract
Abnormalities caused by the hot spot effect are very common in the application of photovoltaic modules, which seriously affect the life and power generation efficiency of photovoltaic modules. Therefore, the study of hot spot effect is of great significance to the development of photovoltaic industry in the future. By analyzing the hot spot effect and its causes, this paper lists possible factors that may affect the hot spot effect, uses the K-proximity algorithm for hot spot detection to classify the near-field infrared images obtained in photovoltaic power plants, and designs experiments to explore the influence of several factors on the hot spot effect, the influence characteristics of the shading area and the types of shading objects are deeply explored, and finally a certain summary is made.
Error Analysis of Electric Energy Metering System Considering Harmonics
Authors: Ma Chenghu , Han Hui , Yan Xing 
Published: October 2022

Abstract
The watt hour metering system includes watt hour meter, voltage and current transformer, errors of them will affect the overall error of metering system. Considering harmonic, this paper studies the measurement accuracy of metering system, the harmonic equivalent circuits of energy meter, voltage and current transformer are established, their harmonic measurement errors and influencing factors are analyzed, the model of whole metering system is bulit and its measurement errors are anylyzed. Through the simulation of a specific watt hour metering system, the influence of harmonics on it is studied.
Simulation Research of Fracture Capacitance of SF6 Circuit Breaker in separating brake
Authors: Wang Jialin , Pang Jianyou , Zhou Xiong , Wang Lu , Peng Yanjun , Pan Ningbo , Chen Jianxi 
Published: October 2022

Abstract
SF6 circuit breaker is equivalent to a capacitor between the fracture surfaces after the break port separation during the switching process. At this time, the fracture capacitance-stroke curve may be closely related to the ablation state of the contact, which is a potential life evaluation scheme. Therefore, this paper builds a typical 126kV SF6 circuit breaker arc chamber model, and calculates the capacitance curve of the separating brake. The results show that the capacitance value of the fracture is about 21 pF when the switch is off, and the capacitance value after the switch is stable is about 7 PF. The capacitance curve shows a trend of rapid decline and tends to be stable. The results can provide a basis for the subsequent use of dynamic capacitance curve to evaluate the electrical life of circuit breakers.
Simulation analysis of the force of wedge-shaped aluminum alloy wire clamp
Authors: Feng Chao , Liu Weike , Cao Xianhui , Hu Yujing , Wang Jun , Xie Yi 
Published: October 2022

Abstract
In this paper, the force simulation analysis of the wedge-shaped aluminum alloy wire clamp is carried out by using SOLIDWORKS Simulation software. Through the finite element modeling of the corresponding type of wedge-shaped clip, and combined with the conditions of the maximum tensile force in service state, the strength check and stiffness check, as well as the maximum stress and maximum displacement calculations are carried out. The simulation analysis result shows that the strength and stiffness of the overall structure of the wedge-shaped aluminum alloy wire clip meet the performance requirements.
Application of Electron-Cloud Equivalent Volume in Analyzing the Effect of Composition on Band Gap
Authors: Zhang Tao 
Published: October 2022

Abstract
In this paper, the variation in band gap E
g with composition has been investigated by means of the parameter V
e (V
e is the electron-cloud equivalent volume of the outmost electron in a molecular). The reasoning indicates that E
g is correlated with V
e. The measured data of some alkaline earth metal halides support the reasoning. On this basis, with the help of the relationship between composition and V
e, the correlation among composition, V
e and E
g is determined. Since the Nephelauxetic effect affects V
e, it also affects E
g, that is, from the perspective of parameter V
e, the Nephelauxetic effect is a factor affecting E
g. A simple method for analyzing the effect of composition on E
g by means of the Nephelauxetic effect and the chemical bond property is proposed. For the alkaline earth metal halides, Mg-doped ZnO crystal, elements of group 4A in the periodic table and some phenomena, the effect of composition on E
g is analyzed by using this method, and the analysis results are consistent with their realities, which verify the effectiveness of this method. This work helps to adjust E
g by changing the composition and develop new materials efficiently.
Power monitoring system log analysis method based on K-Means clustering
Authors: Pang Xiaojian , Wang Binquan , Zeng Chuyang , Tao Wenwei , Su Yang , Hu Zhaohui 
Published: October 2022

Abstract
The amount of log data of the power monitoring system is very large, and log analysis is difficult, which causes the power monitoring system to take more time to analyze the log, and there are problems such as low recall rate. Based on this, the design of the power monitoring system log analysis based on K-Means clustering method. For log mining and preprocessing, the K-Means clustering algorithm is used to measure the similarity and dissimilarity of the logs, clustering and locating the dominant number of similar logs in all log data, and compiling standardized documents for them, and compiling the After the data is stored, the log template is established to analyze the power monitoring system log, so as to realize the power monitoring system log analysis based on K-Means clustering. The experimental results show that the log analysis method studied effectively improves the analysis efficiency and recall rate, and can accurately analyze the log, find abnormal logs, reduce the number of false alarms, and prove the effectiveness of the log analysis method.
Research on valley current prediction control algorithm based on Buck converter
Authors: Wang Mingxin , Zhang Yiming , Zhang Dong , Cui Longfei 
Published: October 2022

Abstract
Helicopter transient electromagnetic (HTEM) launch systems require increasingly high current response rates, a valley current control algorithm based on Buck topology circuit is proposed in this paper. By sampling inductor current valley value, output voltage and the input voltage in the current cycle, the valley value of inductor current in the next cycle is predicted, and thus the duty cycle is derived so that the inductor current can track the reference value in one switching response cycle, which improves the response speed of inductor current and analyzes the stability and speed of the closed-loop system through the Byrd diagram. The valley current algorithm is not only simple, but also easy to implement on digital signal processors (DSPs). Finally, the valley current algorithm is verified by software simulation and experiments.
Optimal Scheduling Research for Day Ahead Market Transaction of Virtual Power Plant Considering Uncertainty and CVaR
Authors: Zhang Wei , Wu Xuemei , Zhang Xiao , Li Fang , Xu Zhenan , Yan Yurong , Meng Hongmin , Liu Zesan 
Published: October 2022

Abstract
Considering the uncertainty of renewable energy generation and the market transaction risk in the day ahead market of virtual power plants, an optimal scheduling model of virtual power plant in the day ahead market was presented. Firstly, this study modeled and analyzed the uncertainty of wind and photovoltaic power generation fluctuations in the virtual power plant. In addition, based on the conditional value at risk theory and the day ahead market clearing rules, the optimal scheduling model of virtual power plants in the day ahead market was established aiming at minimizing the implementation deviation and maximizing the operating income. Finally, the transaction data of a typical region was selected for case study to verify the effectiveness and the feasibility of the optimal scheduling strategy of virtual power plant in day ahead market transaction.
A new multi-stage coordinated power system planning method considering renewable energy access
Authors: Chai Xiaoliang , Lv Hang , Zhao Haidong , Wang Hui , Yang Chao 
Published: October 2022

Abstract
When renewable energy is connected to the new power system, it will affect the normal operation of some energy storage equipment, resulting in too small internal generation capacity of the new power system and insufficient capacity of the new power system. Therefore, based on the consideration of renewable energy access, a new multi-stage coordinated planning method for power system is studied. This paper analyzes the demand for peak shaving capacity of the new power system and determines the access point of renewable energy. a new multi-stage coordinated planning model of power system is built, and the method of multi-stage coordinated planning of power system is studied by solving the model. Set up the experimental environment, give the parameters of the experimental equipment, and design the comparative experiment. The results show that the coordinated planning method studied in this paper can help to reduce the operation cost of the new power system and ensure the economic benefits of the new power system.
Heavy Metal Contents Of Hg, Cd, Pb, And Cu In Blue Swimming Crab (Portunus Pelagicus) In Banten Bay, Indonesia
Authors: Nedya Hanifah , Batu Djamar TF Lumban , Sulistiono  
Published: October 2022

Abstract
Bojonegara coast, Banten Bay is an industrial zone in the West Serang region, which is characterized by the presence of some factories around the coast. These have potential to produce and pour the pollutants such as heavy metals into the water and accumulate into the body of aquatic organisms like blue swimming crab. This study aims to analyze the level of heavy metal accumulation in the blue swimming crab (Portunus pelagicus) of Banten Bay waters. Sampling was carried out from August to October 2020. Analysis of heavy metal content was carried out using AAS (Atomic Absorption Spectrophotometer). During the observation, the heavy metal content of Hg, Cd, Pb, and Cu were significantly different between large and small blue swimming crab (p<0,05). The accumulation of heavy metal Cu in small blue swimming crab ranged from 3,22-4,34 mg kg−1 and large blue swimming crab ranged from 6,64-9,52 mg kg−1 while the heavy metal content of Hg, Cd, and Pb in small crabs was below detection AAS. Bioaccumulation of Cu in blue swimming included moderate to high, while heavy metal Hg, Cd, and Pb it was low accumulation. The safe limit for consumption blue swimming crab is 22,0588 kg of meat/week for adults and 5,5147 kg of meat/week for children.