bluuebunny/crossref_metadata_2025_split huggingface dataset:
Robust optimization scheduling of microgrid considering carbon capture equipment
Authors: Qiao Sen , Meng Runquan , Wei Bin , Li Jiageng 
Published: February 2024

Abstract
To cope with the carbon dioxide generated during the operation of the microgrid and consider the wind power fluctuations, a robust optimization scheduling model for the microgrid is proposed, considering carbon capture equipment. Considering the large amount of carbon emissions caused by micro-turbine power generation and electricity purchase during the operation of microgrid, two operating modes of carbon capture equipment are considered, the carbon trading costs are considered in the objective function, and the output of all wind power is included through a box uncertain set. The C&CG algorithm was used to solve the constructed model and obtain the corresponding scheduling plan. Finally, the effectiveness of the model was verified through numerical examples. The results indicate that the total operating cost of microgrids can be further reduced by setting up carbon capture equipment to operate in flexible mode.
Stability assessment of forestry plant power system based on improved long short-term memory network
Authors: Zhang Liang , Meng Xin , Tian Guohui , Duan Qishen 
Published: February 2024

Abstract
The stability assessment of forestry power system plays a vital role in many aspects. First of all, the stability of the power system is directly related to the production efficiency, employee safety and environmental sustainability of the factory. If the power system is unstable, it may cause power outage or power fluctuations, which will interrupt the production and turn the production line, which will lead to a reduction in production capacity and the increase in production costs. In addition, the stability of the power system is directly related to the security of employees. Sudden power failure or voltage fluctuations may cause improper equipment operation, and may even cause accidents and damage. Therefore, by evaluating the stability of the power system, potential security risks can be reduced. In addition, unstable power systems may cause waste and increase environmental burden. In order to improve the stability of the power system, this article proposes an improved LSTM (long and short memory) model of improved stability prediction. This model uses the power system to operate data, including current, voltage, frequency, and other parameters, and external factors related to weather conditions and load changes to predict the stability of the power system. Compared with traditional methods, this method performs well in predicting the failure and abnormalities of the power system, and has the ability to evaluate high accuracy and stability. Therefore, the improved LSTM model method can be regarded as a powerful tool for power system management and maintenance.
Short-term prediction of wind power based on grey wolf optimization Elman neural network algorithm
Authors: Liu Shu , Sun Zihan , Sun Yi , Kong Deqiang 
Published: February 2024

Abstract
The intermittence and fugitiveness of wind power is one of the significance ekements affecting the quality of wind power. Aiming at the random characteristics of wind power, the output power of short-term wind electricity is forecasted by collecting historical wind speed, power and other parameters of wind farm. A model of Elman network optimized by grey wolf arithmetic (GWO) is proposed to realize short period accurate forecast for wind power. The pattern is verified and analyzed on matlab. Compared with other prediction models, the prediction accuracy is higher, which shows the effectiveness and advancement of the model.
The Capacity-to-load ratio optimization method considering collaborative planning of multi-voltage level power grids
Authors: Wang Kailiang , He Zhuoyi , Ye Jianpeng , Lin Yihan , Lin Lingxue , Ma Yuxin 
Published: February 2024

Abstract
The capacity-to-load ratio is an important indicator to guide power grid planning and has a decisive influence on the selection of substation capacities and the construction of power lines. A capacity-to-load ratio optimization method concerning collaborative planning of multi-voltage level power grids is proposed in this paper. This method aims to minimize the construction cost and takes into account the collaborative planning of substations and power lines of multiple voltage levels. By combining the Bayesian optimization algorithm (BOA) and genetic algorithms (GA), a BOA-GA solving algorithm for the planning model is proposed. This algorithm automatically generates planning schemes for multi-voltage level power grids, and obtains the optimal capacity-to-load ratio, as well as the optimal investment of the power grid construction. Case studies demonstrate that the proposed model can optimize the capacity-to-load ratio and automatically plan the network structure of multi-voltage level power grids. The construction cost is significantly reduced while various technical indicators are satisfied. Additionally, the study reveals that the relationship between the capacity-to-load ratio and the overall investment of multi-voltage level power grid construction is a quadratic function over a long-time scale. And the curve is a parabola going upwards.
Analysis of the impact of distributed photovoltaic grid integration on distribution network voltage
Authors: Chen Qian , Bai Jing , Chen Xiaoyue , Wang Yu , Wang Haiyun , Zhou Yunbin , Wang Fangyu , Dong Nan 
Published: February 2024

Abstract
With the vigorous development of the new power system, the penetration rate of distributed PV grid-connected continues to increase. Large quantities of distributed PV grid-connected will affect the distribution network trend direction on the node voltage, affecting the safe operation of the distribution network. The study aims to address this problem. Firstly, the effect of distributed photovoltaic power generation on distribution network voltage is analyzed by theoretically analyzing different locations and capacities of distributed PV access. Secondly, it establishes a simulation model based on a typical IEEE33 node and performs analysis through trend calculation. Finally, the study derives the voltage distribution law of a distributed PV grid-connected distribution network to ensure the safe and stable operation of the power grid.
Research on performance ratio composition and standard energy efficiency ratio correction method of photovoltaic power station
Authors: Peng Yonglong , Wang Yiyang , Lu Jiang , Li Yabin , Feng Hailong 
Published: February 2024

Abstract
The performance ratio (PR) of the system is used to quantify the power generation efficiency of the photovoltaic power generation system. The size of the index is affected by many factors. After the environmental impact is compensated, the standard energy efficiency ratio (PRstc) of the system is obtained. PRstc is an important index for evaluating the power generation efficiency of photovoltaic power stations. Improving the accuracy of PRstc is conducive to improving the state evaluation and analysis capabilities of power stations, providing a theoretical basis for comparative analysis of photovoltaic power stations in different regions, and improving the scientific operation and maintenance of power stations. The PRstc calculation method of the industry standard NB / T 10394-2020 does not consider the influence of the change of the power temperature coefficient of the component and the weak light response of the photovoltaic cell, which ultimately leads to the calculation result less than the actual value. In order to reduce the error in the calculation of PRstc, the mathematical relationship between PR and power loss of photovoltaic power station is discussed. The calculation method of power loss caused by the change of environmental factors is proposed, and the PRstc is calculated by using the variation. Finally, the PRstc is calculated according to the actual operation data of photovoltaic power station, and compared with the calculation method of industry standard NB / T 10394-2020. The results show that when the total irradiation dose is high, the difference between the two PRstc values is less than 2 %. When the total irradiation is low, the calculation result is larger than that of the standard method, and the difference between the two increases with the decrease of the total irradiation. Due to the consideration of the change of power generation caused by the characteristics of photovoltaic modules, the error caused by the change of power temperature coefficient and weak light response of modules is reduced, which is more advantageous than the calculation method of industry standard.
The impact of massive EV charging on distribution lines
Authors: Chen Wenwen , Wang Yanfei , Huang Yuchen , Chen Yongjin , Luo Shun , Deng Meiling 
Published: February 2024

Abstract
The large-scale charging of electric vehicles at the same time is bound to have a large impact on the distribution network and then reduce the stability of the grid, especially during peak hours when it is easy to overload the lines. In this paper, we combine battery capacity and charging power data of electric vehicles and user usage habits to model the charging load changes of electric vehicles at different scales. The impact of charging by EV owners on network load was also analyzed through case studies. Our results have a certain practical significance for the planning of power grid lines.
Research on relay protection technology of high temperature superconducting cable system
Authors: Zhuo Junjie 
Published: February 2024

Abstract
High-temperature superconducting cables have many advantages such as low line loss, large transmission capacity, small space occupation, and environmental friendliness, which provide a highly efficient, compact, reliable, and green way of power transmission for power grids, and have great potential for application in large-capacity power transmission and urban power grid expansion and reconstruction. However, high-temperature superconducting cables have a complex structure, which is quite different from traditional cable lines in terms of operating conditions and fault mechanisms, and the requirements for the secondary system are also more stringent. Relying on the project of China Power Grid, “Research and Demonstration Application of Superconducting Transmission Technology in Urban Distribution Networks”, the thesis carries out an in-depth research on relay protection technology adapted to the access of high-temperature superconducting cables.
Membrane-type acoustic meta-material-based low-frequency noise reduction design and verification for transformers
Authors: Ma Yuchao , Sun Fugui , Huang Yikang , Qiu Yongjun 
Published: February 2024

Abstract
In order to effectively reduce the radiated transformer noise, high sound insulation membrane-type acoustic meta-materials is designed based on CAE method and the main noise reduction frequency is typical 100Hz to make the maximum noise reduction of transformer. After a scale-reduced 500kV transformer semi an-echoic room noise tests comparison, the results show that the membrane-type acoustic meta-materials effectively suppressed the tonal noise of the transformer, providing a solid application foundation for the noise reduction design of transformer in the future.
Numerical simulation of the flow field inside mixer
Authors: Kang Yong , Sun Runyu 
Published: February 2024

Abstract
When transporting oil in the petroleum industry, due to its high viscosity, cooling can have an impact on the transportation process. It is usually necessary to use a mixer to mix it with cold and hot to increase the temperature of the oil during transportation. In order to study the influence of the inlet pipe diameter of the mixer on mixing efficiency, internal flow field, and temperature field, the temperature distribution and velocity vector in the horizontal and wall directions of the mixer under different pipe diameters are simulated and analyzed using Fluent software in this paper, and pressure and temperature curves are drawn. The following conclusion was drawn: increasing the inlet diameter can not only alleviate the vortex phenomenon caused by the high inlet speed inside the mixer, but also reduce energy loss during water mixing and control the phenomenon of uneven velocity distribution inside the fluid.
Electro-chemical effects on combustion chemistry in electric field fire suppression
Authors: Shu Qi , Liu Boyun , Li Shengnan , Zhao Shuai 
Published: February 2024

Abstract
In order to investigate the role played by electro-chemical effects in the combustion of flames under an external electric field, it is necessary to simulate the chain effect brought about by the increase of electron energy during the combustion reaction by modifying the electron energy according to the ethanol combustion mechanism containing ionic chemical reaction. Due to the large amount of computation involved in carrying out numerical simulations using detailed chemical reaction mechanisms, the mechanisms are simplified in this paper in order to save computational resources. Combining the simplified mechanism, a finite rate chemical reaction model is used to simulate the chemical reaction of ions during the transverse electric field fire extinguishing process, and the relationship between the concentration of intermediate components in ethanol air diffusion combustion and temperature is analyzed.
Improved thermal network model for hot spot location in traction transformer windings
Authors: Liang Xianlu , Fu Qiang 
Published: February 2024

Abstract
Obtaining accurate location information of the hot spot in advance is a prerequisite for locating the hot spot. To tackle this problem, we propose an improved thermal network model, which provides a quantitative method for placing fiber optic sensors at hot-spot locations. The initial step is to construct an enhanced thermal network model that takes into account the thermal resistance of the boundary layer using heat transfer theory. Then, we compare this model with Computational Fluid Dynamics (CFD) in example calculations to validate its effectiveness and precision. The results show that our proposed model can accurately and rapidly calculate temperature distribution within winding areas, enabling the identification of hot spots. This information is reliable for installing monitoring equipment to measure transformer temperatures.
Motor control technology based on fractional active disturbance rejection
Authors: Liu Wenyang , Zhang Yuhuan , Shi Junbiao , Zhang Bo , Li Huiyao , Zheng Sha 
Published: February 2024

Abstract
For non-linear, strongly coupled, multivariable and naturally unstable motor control systems to realize the rapid return of the motor to the original equilibrium point without overshoot, the traditional PID controller algorithm is prone to defects such as large overshoot and long response time. The study proposes fractional order active disturbance rejection control for the motor self-balancing control method. A novel controller composed of a fractional order controller and an active disturbance rejection controller is designed and its control characteristics are analyzed and simulated. The experimental results show that compared with the traditional PID control, the controller has better dynamic performance, steady-state performance and anti-interference ability so that the motor can reach the equilibrium position quickly, stably and accurately. The illustrations of the experimental verification have been modified and explained.
Matching analysis on flow limiting valve of marine diesel engine common rail system
Authors: Sun Lijing , Tian Bingqi , Mao Liwei 
Published: February 2024

Abstract
The flow limiting valve (FLV) designed for the high pressure common rail fuel system (CRS) was designed, the simulation model of the FLV and electronic controlled injector is established and the injector’s model was verified by experiment data. Through simulation, the maximum cycle injection quantity (CIQ) and close flow quantity (CFQ) of the CRS matched with the FLV are verified, and the influence of key FLV’s parameters on the matching performance was analysed. The maximum CIQ is 722mm3 and the CFQ is 1194.2mm3, which can satisfy the technical requirements of the CRS under overload conditions. The closing lift and orifice diameter of the FLV has a significant impact on the CFQ, which should be carefully designed according to the technical requirements, and the dimensional tolerance and processing accuracy should be guaranteed in the production and assembly process to ensure the consistency of the CFQ.
Research on energy coordinated control strategy for offshore wind power based on distributed consistency algorithm
Authors: Chen Deyang , Fan Wei , Liu Yu , Wang Xinwei , Sun Tao 
Published: February 2024

Abstract
Offshore wind power is clean and has a large capacity, making it an important component of the development of new power systems. However, the randomness of offshore wind power affects the stability of the power grid. A coordinated control strategy of offshore wind power and multi-source energy based on a distributed consistency algorithm is proposed for offshore wind farms’ energy coordination management and optimization. By constructing a source network storage load model and analyzing the output and load fluctuations of offshore wind power, energy storage, and power grid, the constraint equation and balance equation of source network load storage power are derived. An adaptive distributed consistency methodology is employed based on a proportional utilization micro growth function to preserve the stability of offshore wind power and the power grid. It can enhance the power distribution of offshore wind power, energy storage, and distribution networks. The outcomes of the simulation show that the suggested approach may quickly equalize power, decrease frequency variations of offshore wind power, and enhance the commercial viability of offshore wind power.
Analysis of a nuclear power plant’s responses to the open-phase fault of preferred power supply
Authors: Lu Jinjun , Wang Zhijian 
Published: February 2024

Abstract
This paper explores the phenomenon of open-phase fault of nuclear power plants for preferred power supply, focusing on three distinct scenarios, normal operation, start, and overhaul. For each scenario, the paper discusses the responses of existing relay protection devices, which are crucial for detecting and mitigating open-phase faults. These responses vary depending on the impedance at the fault location and the load rate of the plant. This paper highlights that open-phase faults can lead to three-phase imbalances in the power system, but their impact on voltage levels is not always straightforward due to the transformer and motor compensation effects. Additionally, the paper identifies blind zones in open-phase fault detection, where existing relays may fail to respond effectively, leading the plant to enter a station blackout state. In conclusion, the research underscores the importance of open-phase fault detection and protection in nuclear power plants. It reveals potential vulnerabilities in existing relay configurations and emphasizes the need for enhanced monitoring and safety measures to prevent extended plant operation under open-phase fault conditions.
The future of X-ray polarimetry towards the 3-dimensional photoelectron track reconstruction
Authors: Kim Dawoon E. , Di Marco Alessandro , Soffitta Paolo , Costa Enrico , Fabiani Sergio , Muleri Fabio , Ratheesh Ajay , La Monaca Fabio , Rankin John , Del Monte Ettore , Rubini Alda 
Published: February 2024

Abstract
The development of the first X-ray polarimeter, based on the photoelectric effect 20 years ago and implemented thanks to advances in gas amplification structures and readout techniques, had a significant impact in opening a new window for X-ray polarimetry. This system measures the X-ray polarization by reconstructing the initial direction of the photoelectron, emitted by the interaction of an incident photon with an atomic electron, in a gas mixture from an ionization track collected on a two-dimensional plane. However, actual X-ray polarimeters, are still requiring relatively long exposure time and cannot coupled with high effective area mirrors or concentrators. In this context, the high yield polarimetry experiment in X-rays (Hype-X) project is currently underway, aiming to improve the sensitivity of the next generation X-ray polarimetry detectors taking advantage of the recent advancements in imaging techniques for high-resolution time projection chambers. In particular, we are evaluating the use of TIMEPIX3 to be applied for the read-out of a gas detector, which will allow us to obtain a three-dimensional image of the photoelectron track. To evaluate the improvement achievable by using a 3D track reconstruction, in this paper, we have reproduced a three-dimensional photoelectron track from a `Geant4' Monte Carlo simulation and examined the sensitivity of X-ray polarimetry using a new three-dimensional track reconstruction algorithm. We report the improvement of the modulation factor with three-dimensional track reconstruction as ∼5% (relative) in the 2–8 keV range and ∼17% (relative) in the 2–4 keV range compared to the current two-dimensional polarimetry system. This is equivalent to add a further telescope to the three-telescope systems now employed in space on board the IXPE mission.
Wavelength-induced shedding frequency modulation of seal whisker inspired cylinders
Authors: Dunt Trevor K , Heck Kirby S , Lyons Kathleen , Murphy Christin T , Bayoán Cal Raúl , Franck Jennifer A 
Published: February 2024

Abstract
The spanwise undulated cylinder geometry inspired by seal whiskers has been shown to alter shedding frequency and reduce fluid forces significantly compared to smooth cylindrical geometry. Prior research has parameterized the whisker-inspired geometry and demonstrated the relevance of geometric variations on force reduction properties. Among the geometric parameters, undulation wavelength was identified as a significant contributor to forcing changes. To analyze the effect of undulation wavelength, a thorough investigation isolating changes in wavelength is performed to expand upon previous research that parameterized whisker-inspired geometry and the relevance of geometric variations on the force reduction properties. A set of five whisker-inspired models of varying wavelength are computationally simulated at a Reynolds number of 250 and compared with an equivalent aspect ratio smooth elliptical cylinder. Above a critical non-dimensional value, the undulation wavelength reduces the amplitude and frequency of vortex shedding accompanied by a reduction in oscillating lift force. Frequency shedding is tied to the creation of wavelength-dependent vortex structures which vary across the whisker span. These vortices produce distinct shedding modes in which the frequency and phase of downstream structures interact to decrease the oscillating lift forces on the whisker model with particular effectiveness around the wavelength values typically found in nature. The culmination of these location-based modes produces a complex and spanwise-dependent lift frequency spectra at those wavelengths exhibiting maximum force reduction. Understanding the mechanisms of unsteady force reduction and the relationship between undulation wavelength and frequency spectra is critical for the application of this geometry to vibration tuning and passive flow control for vortex-induced vibration (VIV) reduction.