bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the Digital Maintenance Construction of Hydropower Unit
Authors: Chen Tiehua , Pan Yu , Liu Xinze , Wu Guangxin , Xu Ming 
Published: June 2024

Abstract
At present, the single unit capacity of hydropower unit is increasing, and the problems of difficulty, high precision, large number of labors and high cost in the maintenance process of large unit are becoming increasingly prominent. With the proposal of intelligent construction of hydropower plant, digital maintenance of hydropower unit has become a research hotspot. This article proposes a construction idea for a digitized maintenance system for hydraulic units based on technologies such as RFID, IoT, and artificial intelligence. This system can modularly manage the unit components and realize the integration and interaction of unit maintenance information through the visualization platform. It utilizes IoT sensors to collect comprehensive information on the components involved in the maintenance process. The components’ information is managed in a hierarchical manner using device KKS coding and a hierarchical structure diagram of the hydraulic unit’s equipment components. Through a visualization platform and equipment knowledge base, the component information is processed and analyzed to generate optimal assembly sequences and paths, thus improving the scientific and rational aspects of the unit’s maintenance process. This approach provides theoretical support for maintenance operations and enhances overall work efficiency.
Research on fault diagnosis of main equipment based on watershed power production data center
Authors: Kang Zhuo , Xiaoyi Chen , Wei Zheng , Linli Song , Peng Zhang , Fatai Shi , Dongjun Wu , Yuting Guo 
Published: June 2024

Abstract
With the development of intelligent hydroelectric power stations and centralized control centers, water and hydropower development companies in various river basins have constructed power production data centers, establishing standardized and normalized data models and connecting the underlying system channels. Based on the power production data center, this paper constructs a unified data model for monitoring the main equipment and, in response to the shortcomings of the existing equipment alarm mode, analyzes the advantages of expert knowledge and intelligent diagnostic methods. It establishes a comprehensive diagnostic system for the main equipment of power stations, providing multi-level and multi-perspective diagnostic reference opinions. This system is of great significance for promoting the development of intelligent hydroelectric power and centralized control. Finally, taking the operating condition data of a mixed-flow turbine generator unit as an example, the effectiveness of the comprehensive diagnostic model is analyzed and verified.
Research on the capacity allocation of composite energy storage systems for hybrid ships
Authors: Tian Fengchao , Sun Jun , Wang Xing 
Published: June 2024

Abstract
Aiming at the problem of unstable output power fluctuation of the dredger during operation, a composite energy storage system consisting of lithium iron phosphate battery and supercapacitor is introduced to smooth out the power fluctuation. Considering the configuration cost, operation and maintenance cost of the energy storage system, the capacity optimization model of the composite energy storage system is established with the average daily cost as the objective function, and with the system power balance, the charge state of the energy storage system, and the rated power as the constraints. The optimal capacity is solved by using the modified artificial fish swarm algorithm (MAFSA). The final results show that MAFSA reduces the capacity of the battery and the supercapacitor by 6.9% and 9.9%, respectively, and reduces the average daily cost of the system by 13.5%. Meanwhile, the capacity-optimized energy storage system enables the generator set to work in the optimal operating range, which reduces its output power fluctuation, improves its efficiency, and reduces fuel consumption and pollutant emission.
Design of downhole oil-water separation device and study on separation mechanism based on rod pump heavy oil system
Authors: Yan Yongheng 
Published: June 2024

Abstract
Downhole oil-water separation technology (DOWS) is a new type of separation technology, which can improve efficiency, reduce energy consumption, and can solve the problem of high water cut oilfield development. At present, there are only two separation methods in the same well injection-production separator, one is the swirl separation technology and the other is the gravity separation technology. Cyclone separation technology mainly relies on cyclone separators to separate oil and water, but it is affected by oil viscosity, water content, and temperature. The gravity separation technology mainly relies on the similar separation principle of a multi-cup equal-flow gas anchor to design a multi-cup equal-flow oil-water separator, but it requires the oil-water mixed production liquid to stay in the settling bowl for a long time. The centrifugal separator has the characteristics of a good separation effect, high efficiency, and low demand for oil. At present, the downhole centrifugal separator is not used in the same well injection-production technology, which mainly needs to solve the driving force problem of the centrifugal separator. The new injection-production device designed in this paper can better solve the driving problem of the centrifugal separator and meet the working requirements of the process.
Capacity optimum distribution mode of various types of energy storage devices considering the improvement of active-supporting capability
Authors: Wang Feng , Zhang Tao , Zhao Feng , Tian Pengfei , Ma Zhiyong 
Published: June 2024

Abstract
Under the dual-carbon development goal, the energy storage (ES) demand on the new energy (NE) side has been upgraded from the scene of promoting absorb to the scene of promoting absorb and actively supporting the power grid. Therefore, this paper proposes a capacity optimum distribution mode (CODM) for various types of ES equipment considering the improvement of active-supporting capability. Firstly, a polytypic ES capacity optimum distribution method considering both NE absorb and active-supporting grid capacity improvement is proposed. Then, the solution process of the complex model is optimized by introducing the characteristic curve extraction method of typical working conditions. Finally, founded on the historical data of typical NE power stations, the ES configuration requirements and economy under the scenes of promoting absorb, promoting absorb and active-supporting are calculated. The comparison results show that compared with promoting absorb, the scenes of promoting absorb and active-supporting can better meet the ES requirements of the NE side technically and have a better economy.
Oxygen reduction reaction activity of Co3O4-modified Pt-graphene electrocatalysts
Authors: Liu Hangcheng , Tao Zeyu , Liu Jianfeng , Shi Zhengrong 
Published: June 2024

Abstract
In this paper, the ORR activity of Pt/Co3O4-modified N-doped graphene electrocatalysts was investigated based on DFT theory. The Dmol3 module in Materials Studio software was used to optimize the construction of NG models under different doping conditions and to calculate the adsorption and desorption properties of oxygen molecules by optimizing the conformation of Pt13 clusters and substrates. A comparative analysis revealed that the Co3O4 modification reduced the oxygen adsorption energy of the Pt/G catalyst. However, after N doping, the oxygen adsorption energy of Pt/Co3O4/NG was superior to that of Pt/NG. After theoretical analysis, it was determined that it was because the doping of N atoms in graphene could promote the release of oxygen vacancies in Co3O4 and strengthen the adsorption interaction between Pt and graphene carriers to improve the oxygen adsorption energy.
Analysis of bending and torsional modal of PMSM rotor systems for EV
Authors: Wang Xiaoxiao , Li Quanfeng 
Published: June 2024

Abstract
The rotor system is crucial in the all-in-one integrated power system of EV, making the study of its dynamic mechanical performance at high speeds imperative. This paper focuses on analyzing the modal characteristics of EV rotor systems and the impact of individual components on bending and torsional vibrations. Using finite element analysis (FEA), a modal analysis of a 100 kW high-speed electric motor rotor is conducted, followed by experimental tests using an exciting method. Comparing simulation with experimental results reveals how end caps and bearings reduce the rotor’s bending natural frequency (BNF), while the core increases it. Additionally, the addition of rotor components leads to varied reductions in the rotor’s torsional natural frequency (TNF). Furthermore, the error between FEA and experimental values for combined rotor modes remains within 3.53%, affirming the accuracy and reliability of the analysis in predicting rotor modal characteristics.
Experimental study of heat transfer performance of industrial air cooler applying R449A instead of R507A refrigerant
Authors: Peng Haowei 
Published: June 2024

Abstract
In response to the problem of refrigerant pollution of the environment, this paper carries out research experiments on the performance of industrial air coolers using R449A and R507A refrigerants, comparing how refrigerant properties impact evaporator heat transfer performance. The parameters, such as the cooling capacity of the evaporator, were analyzed using the heat balance method. The results demonstrate that using R449A refrigerant in the evaporator at 0 °C enhances cooling capacity by 4.52% and heat transfer coefficient by 9.1% compared to the original R507A system. Using R449A refrigerant in the evaporator decreased the cooling capacity and heat transfer coefficient by 25% and 28.26%, respectively, at -18 °C, compared to the original R507A system. Studies have shown that R449A, when replacing R507A systems, has better heat transfer performance at higher temperatures and is suitable for refrigeration systems with higher temperature conditions.
Electrification reconstruction design and analysis of the coal-to-ethylene glycol process
Authors: Wang Dongliang , Wu Bo 
Published: June 2024

Abstract
Industrial electrification is an important way to reduce greenhouse gas emissions and address the issue of renewable energy consumption. Using coal-to-ethylene glycol as an example, the methodology and techno-economic analysis of integrating renewable energy sources with the chemical industry are examined. The findings demonstrate that if electricity prices decline, a reconfiguring electrification process for coal-to-ethylene glycol that uses renewable energy can lower CO2 emissions by 90.88%, boost energy efficiency by 2.21%, and result in cost savings. The electrification reconstruction in chemical industry can aid in the energy transition.
Analysis and optimization of circulating cooling technology of super heavy oil steam spray
Authors: Suen Sen , Yang Hanhua , Ma Dawen , Li Xuejun , Wu Dihua , Lan Mingju , Xiong Xiaoqin 
Published: June 2024

Abstract
The circulating cooling technology of super heavy oil steam spray is crucial for efficient oil vapor (gas) separation in closed transfer station processes and is a key factor in energy consumption within the gathering and transportation system. Therefore, the analysis and optimization of this technology are particularly important. This study analyzed the process of super heavy oil steam spray circulating cooling technology using ASPENPLUS and established a nonlinear integer optimization model to minimize electricity consumption, utilizing Python for programming and the ipopt solver for resolution. It was found that the temperature and flow rate of the steam entering the spray tower affect the flow rate of the exported condensate water, thereby impacting energy consumption. Optimizing the number of operational air coolers can achieve the purpose of energy saving.
Research on the expansion scale of hydropower station installed capacity during deep development
Authors: Wang Fei , Wang Wei , Li Qilong , Xu Da , Yu Jialiang 
Published: June 2024

Abstract
In order to alleviate the problem of global warming, achieve the national goal of carbon emission reduction, and meet the need to increase peak shaving pressure on the power grid because of wind power and solar energy, hydropower resources will turn to in-depth development. This paper analyzes the methods for determining the scale of deep hydropower development from the perspectives of power system demand and hydropower resource utilization. From the perspective of the power system demand, this paper analyzes the reasonable utilization hours of hydroelectric installed capacity in a power grid, optimization methods for power structure, and deep development scale analysis methods. From the perspective of hydropower utilization, this paper analyzes the supplementary installed capacity utilization hours, reasonable installed capacity and guaranteed output ratio of a single hydropower station, and the economic scale calculation method for deep development. This provides a reference for the subsequent deep development of hydropower stations.
Selection of household heating equipment: A case study of Lianyungang city
Authors: Yang Zhenming , Wang Shuai , Zhao Yulei 
Published: June 2024

Abstract
Based on the local climate in Lianyungang, this paper analyzes the local heating demand, a comprehensive comparison of mainstream heating equipment and terminal forms, and analysis and discussion, respectively. By simulating the heating situation in Lianyungang in winter, the heating cost of different equipment in Lianyungang in winter is calculated and combined with the operation of existing projects, and the differences in cost, use, installation, and maintenance of different heating equipment are compared. Finally, the most suitable heating form for Lianyungang users is summarized by integrating theoretical data and actual situations.
Research on internal flow characteristics of the planar conical tube for valveless piezoelectric micropump
Authors: Cai Shengchuan , Wen Xueying , Dong Min 
Published: June 2024

Abstract
As the most commonly used driving and executing components in microfluidic systems, valveless piezoelectric micropumps have broad application prospects in numerous fields. The steady and unsteady characteristics of planar conical tubes for valveless piezoelectric micropumps were simulated using CFX software at different pressure amplitudes and driving frequencies. The aim was to obtain the factors affecting the flow performance of the valveless piezoelectric micropump. The results show that the numbers of Remax
in both diffusion and contraction directions of the planar conical tube increase with increasing pressure. When the number of Wo is lower, the number of Remax
under a steady state is approximately equal to that under an unsteady state, and the maximum relative deviation is only 0.25%. The greater the Wo number, the smaller the velocity on the minimum flow section, and the more significant the velocity change. The rectification efficiency η of the valveless piezoelectric micropump and the efficiency λ of the planar conical tube both increase with increasing pressure under steady conditions, and the maximum values can be reached at 11.2% and 1.56, respectively.
Optimization study on the configuration of electric hydrogen bidirectional coupling microgrid considering system flexibility margin
Authors: Li Yuanxun , Zhang Liting , Li Qifen , Yang Yongwen 
Published: June 2024

Abstract
The solution to the global environmental concerns lies in the clean transformation of the energy system. However, the rapid expansion of renewable energy has increased the dangers of the power grid’s reliable functioning. It is vital to look into more controllable and flexible resources to increase the power grid’s capacity for regulation. Therefore, this paper provides an optimization model for a microgrid that couples electricity and hydrogen, which can improve the flexibility margin of the system significantly through bidirectional transformation and complementarity of electricity and hydrogen. The capacity configuration of each device in the system is solved to optimize the net profit of the system over the course of the system’s life cycle based on the forecast of the demand for wind and solar power generating output and load in the near future. A rolling scheduling simulation is run within a day to optimize the system capacity configuration with the goal of reducing daily operating expenses and maximizing flexibility margins. The results show that the electric-hydrogen coupled system can guarantee the absorption of 100% renewable energy of the traditional electric storage system, which improves the flexibility of the system by 410% and the benefit by 55.6%. This study offers recommendations and resources for the creation of flexible planning for the microgrid system with electro-hydrogen connection.
Distributed photovoltaic hosting capacity assessment technology considering stable operation of distribution network
Authors: Zheng Qiangren , Wu Ming , Hu Lijuan , Li Baoju , Wang Yunhui , Guo Miao , Zheng Nan 
Published: June 2024

Abstract
The rise of distributed photovoltaic (PV) in recent years has enhanced the sustainability, reliability, and flexibility of power systems. However, excessive PV access beyond the distribution network’s hosting capacity can jeopardize grid security and stability. This paper proposes a data-driven assessment method for PV carrying capacity, ensuring optimal integration while considering operational stability. Detailed analysis of a specific distribution network validates the method’s efficacy, leveraging network data for accurate evaluation. The approach holds promise for widespread adoption and large-scale application.
A novel digital energy computation method for dynamic reconfigurable battery networks
Authors: Zhang Congjia , Lei Ertao , Zhou Yanglin , Zhang Junkun , Quan Yue , Ci Song 
Published: June 2024

Abstract
Dynamic reconfigurable battery network (DRBN) is a promising method to overcome battery imbalance. As a complement, a battery management system (BMS) plays a key role in battery status estimation, battery topology reconfiguration, and thermal management. Different from the traditional BMS, a fully distributed DRBN control framework requires high efficiency and massive computation. Inspired by the computer architecture, we propose a novel digital energy computation method for DRBN. First, according to the first principle, we apply the idea of shielding terminal differences on the Internet to BESSs. Then, based on time-oriented management, the framework of DRBN is introduced to eliminate battery differences. Finally, a case analysis shows that DRBN can effectively realize battery balancing during the charging process.
Photoelectric properties of CsPbBr3 perovskite solar cells based on amorphous Nb2O5 electron transport layer
Authors: Zhu Kun , Fu Liyou 
Published: June 2024

Abstract
The superior air and temperature stability and the cheap production costs of the inorganic CsPbBr3 solar cell (PSC) were major concerns. For inorganic CsPbBr3 devices, TiO2 crystals (c-TiO2) are frequently used as an electronic transfer layer (ETL). However, because c-TiO2 preparation necessitates temperatures over 450°C, the flexible inorganic device CsPbBr3 cannot be used. In addition, the low mobility of electrons further limits the ability to improve device performance. On this basis, a novel amorphous Nb2O5 (a-Nb2O5) was prepared. This paper introduces a simple method of preparing inorganic planar CsPbBr3 devices by room temperature sputtering. The highest efficiency of PSC prepared with a-Nb2O5 ETL was 5.74%, which was higher than that of crystalline Nb2O5 (a-Nb2O5) or crystalline TiO2 (c-TiO2) based PSC (5.12% or 4.67%). The photovoltaic properties of CsPbBr3 PSC prepared by a-Nb2O5 ETL were improved. The causes might be attributed to the following: excellent crystallization of the films made from a-Nb2O5 and CsPbBr3, low charge recombination rate of the a-Nb2O5/CsPbBr3 interface, strong optical transmission, and appropriate operating function of a-Nb2O5. In addition, PSC CsPbBr3 based on unpackaged a-Nb2O5 has good long-term stability in the atmosphere. This work offers a fresh line of inquiry for producing extremely effective inorganic PSC.
An energy management strategy for thermoelectric power generation system
Authors: Liang Yanqin , Wang Ying , Wang Jianjun 
Published: June 2024

Abstract
To enhance the output power of thermoelectric generation, a strategy for the energy control of the thermoelectric power generation system is proposed, which involves the rational control and allocation of its output energy. The system includes a thermoelectric battery, DCDC converter, controller, storage battery, and DC load. The system completes energy control based on the relationship between the power generation and load power. The system adopts the maximum power point tracking (MPPT) algorithm, which obtains the maximum output power of the thermoelectric battery by changing the duty cycle of the converter, thus improving the output power and working efficiency of the thermoelectric power generation system. To protect the storage battery and extend its service life, the system adopts a charging management method that combines MPPT charging, constant current charging, and constant voltage charging, making it more scientific and reasonable. Finally, the feasibility and effectiveness of the proposed energy control management strategy are verified through actual experimental results.
Experimental research on low noise control of distributed air conditioning unit system
Authors: Zhang Liang , Jin Linhui , Gu Jialei , Lin Pan 
Published: June 2024

Abstract
In response to the current situation of high noise in ship air conditioning cabins, based on the design requirements of a certain type of ship, research on adaptive improvement design of distributed air conditioning unit systems was carried out. Through research on the research progress of ship air conditioning cabins at home and abroad, combined with existing technologies, in this paper, a cabin environment comfort design based on low noise control was proposed, and a simulation test chamber for distributed air conditioning unit system design verification experiments was built. We studied the low noise control of distributed air conditioning units and the noise characteristics of ship cabins in distributed air conditioning unit systems under different supply and return air types. We tested and recorded the performance parameters of different design schemes and selected the optimal scheme, providing technical basis and data for the optimization design of actual ship systems.
Research on driving condition recognition in hybrid electric vehicle energy management strategy
Authors: Ma Yue , Tian Shaopeng 
Published: June 2024

Abstract
The driving conditions encountered by vehicles during operation are complex and varied, and the ECMS (Equivalent fuel Consumption Minimization Strategy) based on minimum equivalent fuel consumption has poor adaptability to different driving conditions. To optimize the adaptability of the ECMS and improve the overall vehicle economy, this paper proposes an operating condition recognition model based on the Back Propagation neural network algorithm to optimize the ECMS energy management control strategy. Firstly, three types of driving conditions were identified: urban, suburban, and high-speed conditions. A complete vehicle model was constructed on the Matlab/Simulink platform. The efficacy of the strategy, before and after optimization, is verified under the WLTP (Worldwide Harmonized Light Vehicles Test Procedure) driving cycle. Simulation results show that the optimized ECMS can better adjust the power apportionment among the engine and motor, reducing the fuel consumption per hundred kilometers by 4.01% and thereby enhancing the overall vehicle economy.