bluuebunny/crossref_metadata_2025_split huggingface dataset:
CFD simulation study of a biomass pellet-fuelled boiler
Authors: Yan Wuwu , Hao Xiaoling 
Published: September 2023

Abstract
Biomass energy is an important substitute for fossil energy. Direct combustion of biomass in the boiler has the problem of high emissions. In this paper, a 0.1 t/h biomass atmospheric pressure hot water boiler is used for CFD modeling, aiming at providing a low-cost and high-efficiency way for the study of biomass boilers. In this paper, the biomass pyrolysis process is divided into three processes: water evaporation, devolatilization, and coke combustion. Using the UDF function combined with a porous medium model to write code, the gas-solid combustion process in the boiler is realized, and the grate is used to split the air. The calculation results show that the model can accurately restore the temperature, velocity, and composition changes in the boiler. Compared with the actual results, the temperature difference between the furnace and the outlet is less than 20 K, and the modeling has achieved good results.
Study on optimization of household energy use considering photovoltaic access
Authors: Li Junshuang , Luo Xiao 
Published: September 2023

Abstract
Home access to photovoltaic and configuration energy storage can reduce the cost of energy consumption and suppress grid fluctuations. At the same time, various loads in the family can be divided into base loads and flexible loads according to their functional characteristics, some of them also be gas and electricity dual-use loads. This paper aims to reduce the energy consumption cost of households. Firstly, it classifies the loads in photovoltaic-connected households, optimizes the energy source selection of gas and electricity dual-use loads, and optimizes the scheduling of flexible loads’ working hours. Setting reasonable constraints while ensuring the primary energy demand of family members for each load reduces households’ dependence on external energy and energy expenditure. Moreover, the pressure on the regional energy supply can be alleviated by stabilizing the working time of flexible loads.
A numerical study on bubble dynamics and heat transfer of flow boiling in an inclined microchannel
Authors: Wang Haoyuan 
Published: September 2023

Abstract
Flow boiling, as an important heat transfer method, is widely applied in many devices. In this study, a gas-liquid thermal lattice Boltzmann model is adopted to study the flow boiling in an inclined microchannel. Specifically, the bubble growth processes and heat transfer efficiency are studied for different inclined angles. The numerical results show that the liquids occur phase change almost at the same time while the inclined angles are different. As the inclined angle increases, the bubble departure time decreases. Also, the heater temperatures change periodically for the studied cases. The maximum heater temperature is not affected by the inclined angle while the minimum heater temperature decreases when the inclined angle of the microchannel increases. Therefore, the larger inclined angle increases the flow boiling heat transfer efficiency.
Control Strategy of Distributed Battery Energy Storage System with Harmonic Compensation
Authors: Han Wei , Xu Zikun , Zhu Yueyao , Chen Ming , Zhang Jingwei 
Published: September 2023

Abstract
Based on the distributed battery energy storage system (BESS), a grid-connection strategy considering harmonic restraint is investigated. It can compensate the harmonic current to the grid by measuring the grid harmonics, then harmonic compensation is implemented to reduce the total harmonic distortion (THD) of the grid current. In this paper, the method of measuring harmonics in the grid and the control principle of providing power supply and harmonic compensation based on BESS are described. On this basis, the control flow is designed. Firstly, the energy storage grid-connected system is built in MATLAB/Simulink and the uncontrolled rectifier with inductive and resistance load is used for testing. The simulation results show that the grid current contains many harmonics, and the grid current THD decreases significantly by controlling BESS for harmonic compensation, which validates that the control method proposed in this paper is accurate and feasible.
A numerical study on the thermal hydraulic performance of finned elliptical tube with wet air flowing around
Authors: Dong Yue , Zhang Li 
Published: September 2023

Abstract
Energy conservation is a key concern for countries around the world. Enhanced heat exchange is one of the important ways to save energy. The heat transfer process of wet gas is a special heat transfer process, accompanied by a mass transfer phenomenon. Improving the thermal hydraulic performance of wet gas can greatly improve the energy utilization rate. The thermal hydraulic characteristic of finned elliptical tubes with different elliptical axis ratios (0.9 to 0.5) was numerically studied under wet air conditions. Chilton & Colburn factor was chosen as assessment parameters for the thermal performance. The mass transfer effect was characterized by a dehumidifying coefficient. The flow resistance coefficient was adopted to judge the flow characteristic and the London area goodness factor was evaluated for the overall performance. The simulations indicated the superior performance of the finned elliptical tube, j factor of the finned elliptical tube was greater and the flow resistance coefficient was less than that of the finned circular tube. Comparison between different finned elliptical tubes showed that the JF factor increased with the decrease of the elliptical axis ratio. Under the same inlet conditions, the JF factor increases by approximately 50% as the elliptical axis ratio changed from 1 to 0.5.
Energy storage steady-state PCS power allocation algorithm based on SOC dynamic sequencing
Authors: Li Li , Xiong Shangfeng , Zhu Shaojie , Sun Bo , He Chen 
Published: September 2023

Abstract
A power allocation algorithm for energy storage PCS based on SOC sequencing is proposed, aiming at the problem that the energy management system (EMS) can allocate the power of the energy storage unit power converter (PCS) in the existing centralized electrochemical energy storage station steady-state power control, and cannot take into account the equalization of the state of charge (SOC) of the energy storage unit and the power control accuracy of the whole station. Based on the analysis of the characteristics of PCS power allocation algorithms commonly used in engineering, this paper proposes an algorithm to determine the PCS control priority based on the SOC ranking results, and then realize PCS power allocation. The simulation results show that compared with other steady-state PCS power allocation algorithms, the algorithm proposed in this paper can enable the whole station to achieve a better balance of the SOC of the energy storage unit under the premise of satisfying the power control accuracy, so that the energy storage station can provide better steady-state power support for the power grid.
Initial Pressure Optimization of Thermal Power Unit under Deep Variable Operating Conditions
Authors: Niu Baifang , Li Hu , Chen Wenxin , Han Hongjun 
Published: September 2023

Abstract
Aiming at the problem of how to adjust the main steam pressure under the load instruction from the frequency modulation of the power grid to make the operation safer and more economical in the process of peak regulation, we take that 650 MW reheating condensed steam turbine as the research object. This paper introduces some domestic scholars’ research status of initial pressure optimization. The model is established by using EBSILON Professional thermodynamic system simulation software and combining it with the heat balance diagram of the power plant under VWO working conditions. The initial pressure optimization under deep variable working conditions is studied, then introduces the operation mode of the steam turbine under variable working conditions during peak shaving. The mathematical relationship between heat consumption rate and initial pressure was established to determine the feasible range of initial pressure. The exhaustive method traverses the feasible pressure interval under a particular working condition. The heat consumption rate under each pressure was calculated to screen out the optimal initial pressure and optimize the initial pressure curve.
A combined wind-PV power prediction method based on clustering prescreening
Authors: Su Yunhan , Yu Zhuangzhuang , Lv Meijing , Luo Huan 
Published: September 2023

Abstract
Due to the volatility caused by the high uncertainty of renewable energy, the large-scale integration of renewable energy into the electric power grid brings huge challenges to the scheduling and operation of the electric power system. Effective power prediction of power source can not only relieve the pressure of power system peaking and frequency regulation, but also improve the accuracy of decision-making. So as to make the most of the information between wind and photovoltaic power source, this paper puts forward a wind-PV joint power forecasting model. First, the raw power data is pre-screened by clustering to select the closer connection between wind and PV power; next, the screened data are passed through the upper CNN structure respectively after pre-processed. Then, the outputs from CNN modules are fed together into the prediction layer, which include LSTM layers and fully connected layers. Finally, the proposed wind-PV joint prediction model is verified by simulation experiments.
Experimental Study on Heat Transfer Enhancement of Modified CuO Nanofluid in Helical Grooved Tube
Authors: Zhao Shanguo , Hai Guangmei , Ma Hongtao , Huang Long , Liu Zhaoliang 
Published: September 2023

Abstract
This study proposes a novel technology to enhance heat transfer by combining nanofluid and helical grooved tubes. The researchers used a two-step method to obtain a stable modified CuO nanofluid. They then constructed an experimental setup to investigate the single-phase heat transfer of the nanofluid in a helical grooved tube, and compared its performance to traditional methods under varying volume fractions and Reynolds numbers. The experimental results indicate that the use of nanofluid in the helical grooved tube significantly improves the convective heat transfer coefficient. Furthermore, the heat transfer coefficient increases gradually with the addition of nanoparticle volume fraction and Reynolds number. The helical grooved tube’s internal structure causes local turbulence at low Reynolds numbers, intensifying the nano-scale eddies and turbulence inside the nanofluid, enhancing fluid mixing and thermal diffusion rates, and thus improving the heat transfer efficiency.
An MMC control strategy without bridge arm current sensors
Authors: Chen Yanming , Zhao Mingkai , Zhang Zhao , Zeng Sencai 
Published: September 2023

Abstract
Each bridge arm of a modular multilevel converter (MMC) is connected in series with multiple submodules. This structure increases the amount of current detection, making it necessary to have a number of current sensors in operation, which increases the system cost. For this reason, this paper proposes an MMC control strategy that does not require bridge arm current sensors. Firstly, the nearest level modulation (NLM) strategy requires the bridge arm current to be used to determine the submodule entry direction. In this case, this article proposes a method for determining the input direction of the submodule based on the capacitive voltage of the submodule, which calculates the input method of the submodule by analyzing the state quantities in the bridge arm voltage switching function, omitting the bridge arm current sensor and reducing the cost. Secondly, the traditional MMC circulation suppression method needs to detect the bridge arm current to calculate the circulation. However, this paper proposes an indirect circulation suppression method by suppressing the unbalanced voltage based on the analysis of the circulation generation mechanism. Finally, simulations and experiments validate the effectiveness of this method and lay the foundation for the next engineering application.
Multi-stage Drive of Switched Reluctance Motor Based on Ring Winding Structure
Authors: Zhao Zhenyu , Dou Yinke , Sun Haitao , Wang Ruihao , Shao Mingzhi 
Published: September 2023

Abstract
A new ring winding structure can drive switched reluctance motors (SRMs). It uses a full-bridge power converter circuit to drive SRMs and is significant for developing SRMs. For this structure, this paper proposes an optimization strategy. A voltage regulator is used to boost the winding current during the motor starting phase to ensure the average starting and low-speed operation of the motor. After the motor speed reaches a specific value, the passive device replaces the voltage regulator, which ensures the stable operation of the SRM while reducing the frequency of the voltage regulator and improving the service life of the regulator. This paper simulates the optimization strategy of the ring winding structure and derives the calculation method for switching speed.
Voltage Equalization Control Method for ships and warships Supercapacitor Charging
Authors: Bu Susu 
Published: September 2023

Abstract
A DC-DC converter voltage balancing controller with added voltage anti overcharging protection device is proposed to address the voltage balancing control problem of supercapacitors used in Ships and warships. A simulation model is built in the PSIM environment, and through simulation experiments, this balancing controller can improve the voltage balancing rate, reduce space occupation, and prevent overcharging phenomena. The simulation results show that the improved DC-DC voltage balance controller has a detailed improvement effect on the charging voltage balance of ship supercapacitors.
Modeling and simulation of extra high voltage magnetically controlled shunt reactor based on PSCAD
Authors: Wu Haiyan , Wang Liqiang , Xing Huadong , Liu Ziyu , Zhang Aijun 
Published: September 2023

Abstract
For the two typical topologies of the extra high voltage magnetically controlled shunt reactor (MCSR), this study introduces its specific wiring methods and working principles. It conducts an analysis of the change characteristics and response characteristics of the core magnetic flux under different wiring modes of the controlled shunt reactor body. Based on PSCAD, two typical structures are used to model the body of the first 500 kV MCSR put into operation in a provincial power grid and perform steady-state and dynamic simulations. The results of field experiments are compared and analyzed. The winding connection mode of the device’s body electromagnetic transient model is determined, which lays a foundation for the follow-up research.
Research on life distribution model of electrical protection cover for energy meter in charging pile based on accelerated test technology
Authors: Zhang Weixin , Wang Chong , Li Zhenxiang , Liang Bin 
Published: September 2023

Abstract
The electric protection cover for the energy meter in the charging pile is an important part to protect the power line terminal and signal line terminal from being damaged by pollution. However, due to the complex and diverse environment in which the charging pile is located, it is easy to cause damage such as damage to electrical protection cover in high temperatures, high humidity, and other harsh environments, resulting in pollution and corrosion of electrical terminals, affecting normal electricity metering. To solve this problem, this paper studies the important factors that affect the life distribution of the electric protective cover used for energy meters in charging piles in the process of use. The accelerated stress model and method are constructed by the comprehensive application of the accelerated test theory, and the accelerated life test is completed. Through experiments, the failure time distribution of typical electrical protection covers for energy meters in a natural service environment is found, the model is hypothesized, tested, and estimated, and the key parameters of life distribution are determined. This paper also provides a good technical idea for the research of aging failure data analysis of electric plastic materials.
Design and Implementation of the Rapid Debugging and Automatic Acceptance System for the Substation Integrated Automation System
Authors: Tian Qian , Wu Chengnan , Li Man , Lian Hongbo , Chen Si , Li Shurun , Gao Chaofeng 
Published: September 2023

Abstract
This article designs a rapid debugging and automatic acceptance system for the comprehensive automation system of substations, mainly used for the automatic acceptance of information in intelligent substation monitoring systems. It achieves functions such as static verification of remote configuration, synchronous acceptance of remote information and on-site monitoring information, dynamic closed-loop verification of remote information, automatic triggering of remote information, and archiving of acceptance reports; By using computer software technology, communication technology, and other technological means to improve the automation level of the comprehensive automation system acceptance of substations, reduce the participation of various departments in the acceptance process, and reduce the workload of manual operation of primary and secondary equipment addition.
Analysis of Transformer Gas Relay Action under Short Circuit Impact
Authors: Yang Zhi , Shen Yunchao , Wang Shaohe , Zheng Yiming , Jin Linfeng , Zou Jianfeng , Zhang Daning 
Published: September 2023

Abstract
A gas relay is an important non-electric protection device for transformers. Under the action of vibration caused by sudden short circuit impact, misoperation of gas relay leads to transformer tripping accidents frequently. In order to explore the relationship between the vibration intensity of the gas relay and the anti-vibration performance of the gas relay during a sudden short circuit, the sudden short circuit capacity test of the transformer and the vibration test of the gas relay were carried out. The analysis of test data shows that the sudden short circuit process of the transformer will cause the misoperation of some gas relays, which provides data support for the inspection test of gas relays. Finally, the optimization scheme of the detection method of the gas relay is proposed, which further effectively reduces the possibility of misoperation and improves the operation reliability of the transformer equipment.
Bidirectional Thermoelectric Assisted Synchronous Charge Extraction Circuit Based on Buck Structure for Piezoelectric Energy Harvesting
Authors: Wu Qibin , Wang Xiudeng , Xia Yinshui 
Published: September 2023

Abstract
Energy harvesting technology is currently a research hotspot, which can effectively solve energy supply problems in fields such as wireless sensor networks, wearable devices, and smart homes. An energy harvesting system using a thermoelectric generator (TEG) for energy assistance of a piezoelectric transducer (PZT) is proposed. It employs a synchronous charge extraction circuit based on a buck structure (BUCK-SECE), which uses thermoelectric energy to inject energy into the piezoelectric element in both directions to boost the initial voltage of the BUCK-SECE, increasing its output power. The experimental results demonstrate that the utilization of thermoelectric energy can increase the output power of BUCK-SECE by a factor of 3.3 under low-vibration conditions and by a factor of 0.8 under high-vibration conditions. Therefore, the proposed energy harvesting system in this article can effectively enhance the output power of piezoelectric energy transducers and yield desirable performance in real-world applications.
Optimization study of overvoltage problem in PV distribution network based on electrical energy router
Authors: Li Ting , Yang Jianfeng , Yang Aimin 
Published: September 2023

Abstract
Photovoltaic power generation has the advantages of being clean and efficient, but it poses a threat to the voltage quality of distribution networks due to unstable power output. In order to solve the overvoltage and power utilization problems of a high-penetration PV distribution network, this paper proposes a tidal current analysis model based on a four-port power router. First, the steady-state modeling of different ports of the electrical energy router is carried out, and the corresponding voltage control strategy is proposed. Then, by establishing a unified tidal current calculation model, a solution for the optimal operation of the distribution network is proposed. Finally, based on the overvoltage data of a regional power grid, the impact on the voltage level of the grid-connected PV system before and after the addition of the power router is compared. From the analyzed data, it is concluded that the introduction of a four-port power router for corresponding port control strategies can effectively improve overvoltage problems in high-permeability PV distribution networks.
A Method for Improving the Data Availability of Distributed Photovoltaic Power Plants
Authors: Sui Jiayin , Wang Yao , Sun Donglei 
Published: September 2023

Abstract
The growth of distributed photovoltaics is very fast, and there have been situations such as short-term low-voltage distributed photovoltaics sending power to high voltage levels, a voltage exceeding limits, and inadequate operation and maintenance. If data analysis is not done well, it will affect the operation of the power grid and the income of the power station. This article analyses the reasons for the limited data quality of existing distributed photovoltaic monitoring platforms. It proposes a method that can improve the data availability of distributed photovoltaic power plants. By reviewing and repairing abnormal data, efficient application of data can be achieved. It can identify 6 types of abnormal data from 25, and 535 and complete the correction of 6 types of abnormal data. After correction, by comparing the data from nearby power stations, it can be seen that the root mean square deviation is 8.25%.
Research and Application of Digital Emergency Decontamination System
Authors: Li Yuqi , Yao Qilin , He Li , Xu Pengcheng , Zhan Qin , Yang Hongguang 
Published: September 2023

Abstract
With the development of nuclear energy, tritium is extensively used in fusion reactors, nuclear power plants, and tritium-related systems. A digital Emergency Detritiation System (EDS) was developed by combining an ionization chamber, a dew point meter, a circulating pump, a drying bed, a liquid nitrogen condenser, etc. to monitor the system and the tritium gas in the industrial exhaust in real time as well as recover and remove the tritium gas in the exhaust. In the work of a factory, the online monitoring of tritium-containing gas in industrial tail gas was realized. A large amount of tritium gas in industrial tail gas was treated by catalytic oxidation of precious metal oxidation bed to form HTO, and finally, HTO was recovered by a liquid nitrogen cold trap. The complex process flow is visualized and automated by the system integration software to improve the efficiency of scientific research. The results demonstrate that the system can monitor the amount of tritium in tail gas instantaneously and accurately. The removal efficiency of tritium from the industrial exhaust can be up to 99%. After repeated regeneration and activation, the working efficiency of the molecular sieve can still reach 99%, ensuring that the composite emission standards of tritiation-related sites or fusion reactors and other plants are met.