bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Temperature and SO2 on Mercury Removal Performance on a Ce-Cu/Al Catalyst in Low-Temperature Flue Gas
Authors: Zhang Weiyi , Hu Changxing 
Published: February 2023

Abstract
The effects of flue gas temperature and SO2 content on the catalytic oxidation of 2Ce-4Cu/Al catalysts for cooperative control of Hg0 and NO were investigated. The results show that the optimum activation temperature is 200°C. And when the concentration of SO2 in the gas reaches 600ppm, the comprehensive conversion efficiency of Hg0 and NO is optimal, the conversion efficiency remains above 70%. The results of the catalyst analysis before and after the reaction show that both lattice oxygen and chemisorption oxygen are involved in the reaction. Cu and Ce have a cooperative reaction on the catalyst surface. The interconversion between Ce and Cu ions of different values contributes to the formation of surface lattice oxygen, which promotes the Hg0 catalytic oxidation reaction and NH3-SCR reaction.
A Two-layer Optimization Model for Energy Storage System Configuration Considering Life Cycle Cost
Authors: Wang Xueying , Peng Dong , Zhao Lang , Xue Yawei , Lin Keyao , Hong Juhua 
Published: February 2023

Abstract
For solving grid voltage fluctuation as a result of the increase of renewable energy penetration, a two-layer optimization strategy considering the life-cycle cost and benefit is proposed. First, a model of life cycle cost-benefit is established to calculate various costs and benefits of energy storage. Then, the combination of genetic algorithms is determined, which is applied to the inner and outer layers. Finally, the proposed optimal configuration strategy is simulated with a Benchmark low-voltage microgrid. The example is given to verify the effectiveness of the proposed method.
Influence Analysis of Photovoltaic Output on Harmonics and Flicker under Extreme Weather Conditions
Authors: Wang Hui , Hu Guo , Dai Shenjian , Zhou Cheng , Cao Zitao 
Published: February 2023

Abstract
To solve the influence of photovoltaic connected to the station on the power quality of the low-voltage distribution network under extreme weather conditions, the two key points of harmonic and flicker are researched, and the analysis model of harmonic and flicker of the low-voltage distribution network is established according to the characteristics of the low-voltage distribution network in the station area. The characteristics of harmonics and flicker in low-voltage distribution networks with photovoltaic grid-connected inverters as grid-connected interfaces are studied in this paper. Through simulation, it can be concluded that the meteorological factors in the operating environment of distributed grid-connected photovoltaic power supply will have a certain impact on the harmonics and flicker of the low-voltage distribution network in the station area. The main reason is that extreme weather affects the output of the photovoltaic power supply, and the reduction of the PWM duty cycle under low output conditions leads to a significant increase in the number of odd harmonics. At the same time, the low output operation condition also leads to the occurrence of flicker. Finally, a method of controlling the generation of harmonics and flicker by using BP artificial neural network to predict the photovoltaic output and optimize the operation of photovoltaic is proposed. This method has certain practicability for improving the power quality of distributed photovoltaic power supply after connecting to the low-voltage distribution network in the station area.
Analysis of Power Failure Causes and Optimization Strategy of Valve Control System in Flexible DC Transmission Project
Authors: Xiao Kai , Wang Zhen , Zou Yansheng , Liang Ning 
Published: February 2023

Abstract
Kunliulong DC project is the first UHV hybrid multi-terminal DC project in the world. The reliability of its valve control system is directly related to the operation stability of the DC project. This paper analyzes the DC trip event caused by the power failure of the pulse box of the valve control system, determines the root cause of the event, proposes the rectification measures based on the accident causes, and carries out the test verification. The proposed scheme has been successfully applied to the Longmen converter station of the Kunming Liulong Project. The conclusions and measures in this paper have important reference significance for the design of the valve control system of flexible and direct engineering and for guiding the engineering practice.
The Effect of Installing Temperature Stratifiers in PV/T Systems on Their Power Generation Efficiency Increases under Different Climatic Conditions
Authors: Xu Peiyuan 
Published: February 2023

Abstract
With the advent of the energy crisis, more comprehensive approaches to solar energy use are gaining traction, such as the Photovoltaic/Thermal (PV/T) system. The goal of this research is to determine the power efficiency increase of the PV/T system brought about by the temperature stratifier installed in the thermal tank. This PV/T system consists of two parts: a plate PV cell with a glazing cover and a water-cooling system with a thermal tank. In this paper, an optimization method for cooling systems is presented. A temperature stratifier is installed in a thermal tank to create a temperature stratification in it. The water in the lower layer becomes colder, which leads to a better cooling effect of the cooling system and increases the power generation efficiency of the photovoltaic cell (PV cell). The optimization of the above system is verified by mathematical modeling, and it is found that this method can indeed optimize the power generation efficiency of the PV/T system. The efficiency increase can reach more than 3%, and a comparison of the results for different climatic conditions leads to the conclusion that PV/T systems installed with temperature stratifiers will gain relatively more in cities with higher average ambient temperature and solar irradiation, while the effect of wind speed on this increase is limited in non-extreme cases.
Application of Feature Extraction Method Based on Empirical Fourier Decomposition in Rotor Rub-impact Fault
Authors: Hai Zhichao , Chen Xueliang , Li Qiurui 
Published: February 2023

Abstract
This paper provides a feature extraction technique primarily by using empirical Fourier decomposition (EFD) to reveal the time-frequency features of rotor rub-impact fault. The Hilbert transform estimates the instantaneous frequency (IF) and instantaneous amplitude (IA) of the signal generated by EFD. Finally, high-quality time-frequency representation (TFR) is reconstructed by the adaptive time-frequency spectrum (ATFS). An example of the rotor rub-impact fault is utilized to demonstrate efficiency of this technique, and the results are contrasted with those of empirical mode decomposition (EMD). EFD performs better in the modal mixing problem than EMD and has excellent decomposition efficiency. It realizes IF feature extraction and offers a more precise TFR.
A novel model predictive control strategy of D-PMSG wind turbine systems for LVRT based on two-state unloading resistance and super capacitor
Authors: Li Junda , Zhang Zhenbin , Yang Xinliang 
Published: February 2023

Abstract
For low voltage ride through (LVRT) of the wind power generation system, rotor energy storage and super capacitor are promising options. When the rotor energy storage cooperates with the super capacitor for LVRT, the DC voltage will undulate violently due to the speed fluctuation. To solve this problem, a crowbar circuit topology and its control strategy including unloading resistance and super capacitor are proposed in this paper. During the process of LVRT, the super capacitor and resistor absorb energies together. In doing so, the DC bus voltage fluctuation will be suppressed by changing the value of the unloading resistance. The proposed method can effectively reduce the power of the unloading resistor and the capacity of super capacitor, and further decrease the hardware cost. By adding the penalty term of the current change rate to the cost function using the model predictive control method (MPC), the DC bus voltage fluctuation is reduced with the realization of rotor energy storage. The control performances of the proposed LVRT strategy are validated through simulation results.
Power Limiting for Battery Manage System based on Event-triggered mechanism with stationary leaders
Authors: Xu Qingpeng , Fang Xiaohan , Fan Yuan , Cheng Songsong 
Published: February 2023

Abstract
In this paper, the power constraints of battery energy storage systems(BESS) are considered by designing a cooperative consensus algorithm utilizing Soc containment control. For batteries of different capacities, power constraints and Soc balancing can be achieved under undirected topology and containment control. The distributed event-triggered mechanism is adopted to reduce communication time and consumption of communication resources. In the last section, the effectiveness and stability of the designed control strategy are verified by MATLAB simulation.
Heat Transfer Simulation and Analysis of Electron Collector Based on Real-time Uniformity Detection Device of Irradiation Accelerator
Authors: Zhang Gefei , Yuan Jushigang , Pang Shiqiang , Huang Jiang 
Published: February 2023

Abstract
Beam scanning uniformity is an important parameter of electron irradiation accelerators, which affects the quality of irradiated products. Accurate measurements of beam scanning uniformity are required to evaluate accelerator performance. Currently, a set of devices is being developed to measure beam scanning uniformity under full beam conditions. However, the measurement device faces serious heating problems when the beam power is large. In this paper, the cooling structure of the electron collector is designed for the developed measurement device. The temperature distribution of the electron collector is simulated by ANSYS. The appropriate cooling flow rates are selected to ensure the thermal stability of the device when the total beam powers are 30 kW and 50 kW, respectively. The electron collector with a cooling structure is fabricated according to design parameters, and the experiment is carried out under a 1.5 MeV accelerator. The temperature is monitored by an infrared thermometer. The results show that the measured temperature is below the limit. The designed cooling parameters effectively solve the heating problem.
Three-dimensional Tidal Dynamic Characteristics and Tidal Current Energy Evaluation in the Southern Sea Area of Hainan Island
Authors: Huang Huiming , Huang Xiantao , Li Siqi 
Published: February 2023

Abstract
Tidal current energy is a kind of marine renewable energy. It has broad application prospects. In this paper, a three-dimensional tidal current numerical model was established, and the model was verified by the measured data of the tide level station. Based on the numerical model, the tidal current feature and tidal current energy distribution were accurately simulated and analyzed in the southern sea area of Hainan Island. The results showed that the annual average velocity of the current was evenly distributed among the space in the study area. But the annual cumulative time of typical velocity in different sea areas was different in space. C2 had more accumulative time for the low-velocity range (<0.4m/s) of the surface, while C1 had more accumulative time for the low-velocity range (<0.3m/s) of the water depth of 8.5m. C3 sea area had more accumulative time in the high-velocity range at the surface (0.4~2.0m/s) and water depth of 8.5m (>0.3m/s). And the area with the highest annual average tidal current energy density at the water depth of 8.5m was C3, which is up to 128.40w/m2. C2 sea area had the smallest energy, only 62.63w/m2. Compared with C1 and C2 sea areas, the C3 area should be developed emphatically when developing tidal current energy resources in this sea area.
Assessment Method for Demand Side User Response Potential based on Game Theory and Information Value
Authors: Liu Wei , Wang Chaoliang , Li Yilong 
Published: February 2023

Abstract
An accurate assessment of user demand response potential is helpful for power companies or load aggregators to rationally call demand-side resources, improve the implementation effect of demand response, and reduce the peak-valley load difference of power systems. This paper proposes a new approach based on game theory and information value to evaluate the response potential of demand-side users. Firstly, the evaluation index system of user response potential is established based on user history behaviors, user basic information, aggregator’s incentive to users, and user’s information value. Secondly, based on game theory, the total of subjective and objective weights is integrated, and the game solution of evaluation index weight is obtained. Finally, the user potential assessment results are quantified based on the fuzzy optimization set pair analysis theory to achieve an accurate online assessment of the demand-side user response potential.
A Study on the Corrosion Behaviour and Mechanism of Associated Gas on Surface Pipes in Fire-flooding Oil Recovery
Authors: Zhou Lifeng 
Published: February 2023

Abstract
The fire-flooding associated gas in Liaohe Oilfield contains a mixture of gases, of which O2 and CO2 will interact with each other and corrode surface pipes. In this paper, the corrosion rate of different pipe materials in descending order is 20# steel>20G steel> L360 steel>L245 steel by weight loss method, painting, and chrome plating can reduce the corrosion rate. In combination with SEM, EDS, XRD and other means to analyze the corrosion mechanism of the CO2-O2 coexistence system, a loose and porous Fe(OH)3 film is formed on the surface of the material. After removing the corrosion products, needle-shaped pores with different diameters appear, indicating serious pitting corrosion. The corrosion products are composed of Fe and O elements, mainly the dehydrated products FeOOH and Fe2O3.
Research on active disturbance rejection control of the main steam temperature of supercritical thermal power unit based on improved particle swarm optimization
Authors: Hao Xiaoguang , Jin Fei , Wang Bin , Bao Jiandong , Shi Yijun 
Published: February 2023

Abstract
The stability of the boiler’s main steam temperature is very important for the safe operation of the unit. At present, the mainstream PID control scheme is simple to use and convenient to set, but it cannot accomplish a acceptable ascendancy effect in the face of the main steam temperature control structure; with a long time delay, large inertia. In view of this situation, first of all, this paper introduces the linear active disturbance rejection control (LADRC) technology in a steam temperature control structure. The main loop adopts the linear active disturbance rejection controller and the subloop adopts the P-controller. Then, the particle swarm optimization algorithm is improved and used to modify the parameter of the LADRC, so that the LADRC system adjusted according to the theory can better complete the control task. Finally, a simulation to control the temperature is given, and the results show that the LADRC control system can track quickly and stably; in addition, as against with this traditional PID control strategy, it can achieve strong anti-interference performance.
Research on adaptive control technology of wind power generation based on AI data mining
Authors: Hao Yucheng , Huo Xuesong , Huang Xianming , Li Xiao , Chai Yun 
Published: February 2023

Abstract
This paper introduces the current achievement and control technology of wind power generation industry. By analysing the characteristics and influencing factors of wind power generation, we proposed an ultra-short-term wind power forecasting network structure which can work well in wind power forecasting. Based on the characteristics of the datasets, a variety of mainstream neural network structures are compared, our proposed method is suitable for high volatility series is further developed. The structure integrates CNN, RNN and attention mechanism, which alleviates the problem of prediction curve lag to a certain extent and effectively avoids virtually useless prediction.
Study on heat transfer enhancement of nanofluid in a new type of heat exchangers
Authors: Zhang Liang , Qu Pingping , Jing Yuyan , Wang Wenjie , Yao Xinyue 
Published: February 2023

Abstract
As one of the essential equipment in industrial production, improving the efficiency of heat exchangers to slow down energy consumption has become a popular topic. In this paper, the structure of a conventional fixed tube plate heat exchanger is optimized by numerical simulation, replacing the straight tube with a wavy wall tube. The impact of particle size of Cu-water nanofluid on the performance in the new heat exchanger (HEX) is also investigated. The results indicate that using the wavy wall tube enhances the flow field perturbation and improves the working mass’s flow state; adding nanoparticles in water can improve the heat transfer capacity of the fluid. It is also found that the shell process pressure drops (ΔP) and the heat transfer effect of the HEX increased with increasing of the fluid volume flow rate; at the same volume flow rate and the volume fraction of 0.5%, the ΔP of the Cu-water nanofluid in the HEX increases with increasing of the particle size. The heat transfer performance decreases gradually with increasing of the particle size. The smaller particle size of Cu nanoparticles can improve the efficiency of enhanced heat transfer to a larger extent.
Unsteady characteristics of the diffusion/nozzle tube for valveless piezoelectric micropumps at a lower frequency
Authors: Cai Sheng-Chuan , Dong Min , Sun Wan-Xue , Qi Su-Su 
Published: February 2023

Abstract
In this study, transient flow performance of the diffusion/nozzle tube with diffusion angle of 10° under different Wo numbers was studied using ANSYS CFX software. The purpose of this work is to obtain the factors which influence the flow characteristics of the diffusion/nozzle tube for valveless piezoelectric micropumps under unsteady conditions. A time-dependent sinusoidal pressure is exerted for the entrance as the boundary condition, and the pressure amplitudes P0
are 50Pa, 100Pa, 500Pa, 1000Pa and 5000Pa. The simulation results show that the change of flow lags behind the variation of pressure under unsteady flow conditions. The greater the Wo numbers, the smaller the pressure amplitude P0
, and the greater the phase difference. Both the loss coefficient of pressure in the diffusion ξd
, and the nozzle ξn
increase with increasing Wo numbers, and decrease with increasing P0
. The vortex has a great influence on the flow characteristics of the valveless piezoelectric micropumps.
Measurement and Numerical Simulation of Cylinder Surface Pressure under Different Air Volumes
Authors: Yang Maoli , Wang Ruixin , Zhou Wenping , Liu Xiangshu , Qiang Rui , Huang Fuchuan 
Published: February 2023

Abstract
As a classic research topic of fluid mechanics, the research on the problem of flow around a circular cylinder is essential both from the perspective of academic research and application in the engineering industry. In this paper, the surface pressure of the cylinder is measured by the experimental research on the flow around the circular cylinder, the three-dimensional modeling of the key parts of the experiment is carried out according to the one-to-one size, and the three-dimensional CFD software is used to numerically simulate the velocity field and the pressure field. The research shows that under different air volumes, the relative error between the experimental value and the simulated value of the inlet velocity in the convergence section and the working section is less than 5%. It can be considered that the results of the numerical simulation and the experimental results are within the allowable range. The relative error between the experimental value and the simulated value of pressure is less than 2%, and the numerical simulation results are consistent with the experimental results. It lays a theoretical foundation for the improvement of the flow around the cylinder experiment and its engineering application in the future.
A Hybrid Energy Harvester Based on Piezoelectric and Electromagnetic mechanisms
Authors: Shen Fan , Zhao Li , Zhang Qin , Xin Chuanfu , Gong Ying , Peng Yan , Li Zhongjie 
Published: February 2023

Abstract
This paper presents a hybridization energy harvester (HEH) based on a two degrees-of-freedom (2-DOF) cantilever beam, which combines the electromagnetic effect with the piezoelectric effect. Finite element simulations and some experiments were used to investigate the output of the HEH. For the electromagnetic energy harvester (EMEH), we used an alternating-arranged magnet array to get high electromotive forces. The frequency sweep experiment showed that the resonance frequency of the cantilever beam was about 26.7 Hz which is close to the simulation value, 28.7 Hz. With the increase of excitation acceleration, both piezoelectric and electromagnetic open-circuit voltages increased. The impedance matching experiments of the EMEH and piezoelectric energy harvester (PEH) displayed that the best matching resistors are 35 Ω and 8×105 Ω respectively. In capacitor charging experiments, the maximum voltage of the capacitor (220μF) increased from 0.95 V to 1.63 V by paralleling the EMEH and the PEH. But when the EMEH and the PEH were connected in series, the maximum voltage of the capacitor (220μF) was 4.4 V. Therefore, it is clear that the proposed hybridization energy harvester balances the weakness of electromagnetic and piezoelectric harvesters. Besides, it can also make higher output performance.
Application research of piston wind and vertical axis wind turbine in the subway tunnel
Authors: Wang Zheng , Dou Jie , Qi Susu 
Published: February 2023

Abstract
When the above-ground space is insufficient to meet the traffic demand of people, the advantages of underground rail transit are particularly prominent. It has the advantages of short distance, unobstructed and so on, so it is imperative to develop underground rail transit. When the subway train is running, it will push the air forward. Due to the restriction of the tunnel’s inner wall on the air, a large number of piston winds are formed. Piston wind is harmful to train running and tunnel fire, but its air volume and wind speed are considerable. The vertical axis wind turbine has the advantages of small size and high power generation efficiency. It can be embedded in the inner wall of the subway tunnel, and it will not increase the resistance of the train. It can supply power for small electrical equipment in the subway tunnel.
Research on the development and application of electrochemical energy storage in power system
Authors: Zhang Xiuqi , Wang Liqiang , Yuan Shuai , Cong Yu , He Fang , Li Yong 
Published: February 2023

Abstract
New energy is connected to the power grid on a large scale, which brings some new features. Energy storage plays an important role in supporting power system and promoting utilization of new energy. Firstly, it analyzes the function of energy storage from the perspectives of the power generation side, power grid side and user side, and expounds on the development of electrochemical energy storage. Secondly, it sorts out the relevant policies and technical standards. It points out the main technical challenges in development and application of electrochemical energy storage. Finally it gives suggestions on the development direction.