bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on power grid energy saving and loss reduction control methods under the harmonic influence
Authors: Zhang Shujun , Lu Haiqing , Zhao Fei 
Published: September 2023

Abstract
To reduce energy consumption and power grid operation costs, a control method that considers the influence of harmonics is proposed for power grid energy saving and loss reduction. The zip load model is utilized to build the power grid load model, and voltage characteristic curves are obtained under different parameters to calculate network loss. Furthermore, the voltage RMS and total harmonic distortion of nodes are calculated under varying load levels. Ultimately, a control objective function is established to achieve power grid energy saving and loss reduction. Experimental results indicate that this method outperforms traditional methods in terms of voltage response effect and achieves a more extensive reduction range of network loss, with a maximum reduction exceeding 35%.
Two-stage dispatch optimal model of virtual power plant considering pumped storage
Authors: Wu MeiRong , Xue Fei , Ren Yong , Li Feng 
Published: September 2023

Abstract
When virtual power plant (VPP) participates in power grid dispatch, it not only faces the problem of market bidding but also has the security and stability problems of voltage, frequency, power flow, and so on. The optimal dispatch strategy of VPP, which participates in a hybrid market, is proposed. The two-stage optimal model is established. An economic dispatch optimal model based on robust control and stochastic linear programming is established to maximize the profit of VPP. Aiming to minimize the difference between the output power of each distribution energy resource and the optimal results of economic dispatch, a safety dispatch optimal model based on a particle swarm optimization algorithm is established. The simulation results with the measured data of the Ningxia power grid show that the two-stage optimal dispatch model is effective.
Active Disturbance Rejection Controll Strategy with Lead Compensation and Feedforward
Authors: Yuan Yecang , Ma Youjie , Zhou Xuesong , Zhang Jiangong , Wang Bo , Wen Quan , Wang Haocheng 
Published: September 2023

Abstract
An active disturbance rejection controll Strategy with lead compensation and feedforward (ADRC-LCF) is proposed to address the problem of poor power quality at the output of the direct-to-direct converter when the microgrid is subject to uncertain disturbances. The control strategy achieves the reconstruction of the self-anti-disturbance controller by connecting the over-compensator in series and introducing differential feedforward, which effectively improves the disturbance suppression performance of the controller. Finally, numerical simulations comparing different operating conditions show that the recovery time of the ADRC-LCF is reduced by about 70% and 58% compared to the PI and LADRC respectively in the face of load shedding; the maximum overshoot of the ADRC-LCF is reduced by about 81% and 58% compared to the PI and LADRC respectively in the face of a sudden increase in bus voltage.
A High Crosstalk Suppression SiC MOSFET Gate Driver
Authors: Wu Zhaohui , Chen Kangping , Li Bin 
Published: September 2023

Abstract
Fast switching speeds and high switching frequencies bring serious crosstalk problems in SiC MOSFET applications. In this paper, we design a SiC MOSFET gate driver with high crosstalk suppression capability by using a multi-level drive and active Miller clamp technology. In the design, an auxiliary branch is introduced to control the source potential of the SiC MOSFET to achieve multilevel driving. The branch has a simple structure, simple control logic, no external negative voltage supply, and adjustable negative output voltage. The proposed SiC MOSFET gate driver was designed using the Central Semiconductor Manufacturing Corporation (CSMC) 0.8 μm BCD high voltage process. The designed SiC MOSFET gate driver has an area of 2967 μm × 3180 μm. The simulation verification model is based on Wolfspeed’s SiC MOSFET product C3M0075120D. Post-layout simulation results show that a SiC MOSFET gate driver with a crosstalk suppression capability of over 150 V/ns is obtained, which can reliably drive SiC MOSFET power devices.
State Analysis of Protection Device Considering Primary Equipment
Authors: Zhang Hanbin , Liu Qing 
Published: September 2023

Abstract
At present, the state monitoring models of relay protection use constant fault probability to predict the failure rate of protection devices, fail to consider the dynamic impact of equipment aging on failure rate, and only analyze the status of protection devices. In view of this, an improved Markov state prediction method based on Weibull distribution is proposed, combining the primary equipment’s state space to analyze the state of the protection device. First, the failure model of the relay protection device is established by the GM-SVR method. Then the 13-state Markov chain is established by combining primary equipment and the protection device. Finally, after introducing the failure model, the prediction of the line protection operation state is realized. The simulation results show that the optimized Markov chain is more in line with the actual operating conditions and can more effectively predict the operating state of the equipment during the operating life.
Improving the Synchronous Stability Control Strategy of Virtual Synchronous Generators
Authors: Wang Liwei , Jiang Lin 
Published: September 2023

Abstract
The microgrid dominated by new energy has small inertia and weak damping, while a virtual synchronous generator (VSG) is an effective means to enhance inertia and damping to improve the stability of the microgrid. However, it also introduces power angle oscillation problems similar to that of synchronous machines. This paper is based on the current inner loop and voltage outer loop control of the three-phase LCL inverter. It introduces the virtual inertia and damping coefficient of the virtual synchronous generator, achieving a good grid connection effect. While a significant change in active power occurs, the system can lose synchronization and stability. Therefore, the paper proposes an improved synchronization stability control strategy for virtual synchronous generators by introducing a frequency-proportional integral feed-forward link in the reactive power loop to suppress power angle oscillation and improve system synchronization stability. Theoretical analysis was conducted on the synchronous stability of the improved control strategy in case of sudden changes in active power load. The effectiveness of the strategy was verified through simulation.
Wireless positioning method for transmission pipe gallery inspection robot based on the TDOA algorithm
Authors: Yao Wenjie , Zhang Hao , Luo Ruikai , Fu Jianding , Bai Wei , Zheng Pengwei , Wei Rongshan , Chen Zhizhong 
Published: September 2023

Abstract
A wireless sensor network for positioning an inspection robot is developed for a transmission pipe gallery environment. The time difference of the arrival algorithm optimized by the least squares method is utilized to realize the wireless positioning function of the robot in the inspection process. The developed system adopts a spiral configuration to install the sensor nodes at equal intervals on the sidewall of the transmission pipe gallery, and only 10 sensor nodes closest to the wireless signal transmission source are activated for each measurement, which avoids the poor long-distance measurement effect of the sensor, ensures sufficient accuracy, and reduces calculation costs. A wireless positioning simulation test was conducted in an experimental transmission corridor environment. The error of the simulation results is equivalent to the measurement error of a single sensor, and the error is not accumulated in the calculation of the algorithm, indicating that the algorithm has achieved good results.
Adaptive Power Control Method for Distributed Generators in DC Microgrids
Authors: Wang Xin , Yu Yangyang , Xi Shengzhe , Wang Lin , Yue Quanyou , Zhao Wei , Niu Zhiyong , Peng Peng 
Published: September 2023

Abstract
The model-free control strategy based on the adaptive observer is presented to manage load power distribution for distributed generators in DC microgrids. By dynamically linearizing the modeling of the microgrid system, the model-free secondary control signal is designed to coordinate the distributed power sources, so that the load power is distributed proportionally to the rated capacity. In addition, the desired output voltage is introduced to restore the system bus voltage. The control scheme cannot depend on the structural details of the object system, which is structurally simple and easily implemented. Finally, the feasibility of the proposed data-driven scheme is demonstrated through case test results based on the RTDS experimental platform.
Reliability analysis of wind power gearbox based on fault tree and monte carlo simulation
Authors: Chen Lin 
Published: September 2023

Abstract
The gearbox is an important speed-up component in wind turbine, and the environment in which wind turbine operates is generally harsh. For maintenance and replacement of the gearbox and its difficult operation, it is self-evident that it is important to ensure its reliable operation. Through collecting and analyzing the structural and functional principle of the gearbox and data of common failure modes, the fault tree of the gearbox is established, and failure rate data and corresponding distribution are obtained by manual and data inquiry for each bottom event. Combining Monte Carlo simulation, the reliability curves of each bottom event mode of the gearbox, the gearbox, and important components are solved, and the assumptions of improving the important bottom events are made. By comparing the curves with the previous ones, it is proved that the improvement of important components can effectively improve the system’s reliability.
Research on Decentralized Centralized Control Model for Fast Load Response
Authors: Fan Jinheng , Lu Yutao , Ma Zhenyu , Ma Li , Yu Zhiwen , Peng Weilun , Liu Qiying , Zhao Ying 
Published: September 2023

Abstract
With the introduction of a high proportion of new energy, the security and stability of the power system face enormous challenges. Against the backdrop of insufficient traditional flexible regulation resources, it is urgent to tap into the adjustable potential of load side rapid response resources. This article conducts a modeling of the dynamic response process of fast response load, and proposes a decentralized centralized control optimization model for fast response load in response to the demand of the power grid. Through simulation analysis of different examples, the optimization effect of this method on the load curve of the power system is obtained, achieving the suppression of new energy output fluctuations and the maintenance of real-time supply and demand balance in the power system.
Simulation analysis of cathodic ablation under the arcing action of vacuum rotary contacts
Authors: Liu Xiufeng , Cao Yundong , Fu Si 
Published: September 2023

Abstract
During the breaking process of the switchgear, a rotational movement of 1-10 degrees per millisecond is added to the contacts. Allowing for more even distribution of arc energy affects the cathodic ablation process. The cathode ablation process under the action of a vacuum rotary contact arc and the effect of rotary motion on the cathode surface are studied during arc ignition in a vacuum metal vapour arc in the paper. A three-dimensional (3D) cathodic ablation transient model with contact rotation characteristics is developed by considering the effects of arc pressure and the Marangoni effect, combined with the hydrodynamic equations and heat transfer equations. Based on a 3D transient model, the action of the arc on the cathode surface is compared and analyzed for different modes of contact movement. The results show that there is a lower cathode surface temperature, a smaller melt zone and a smaller ablation volume by the contact rotation method.
Experimental and Simulation Research on the Vibration Characteristics of the Traction Motor of Medium and Low Speed Maglev Train under Electromagnetic Excitation
Authors: Ou Fengyu , Chen Chunjun 
Published: September 2023

Abstract
In a medium and low speed maglev train, the linear induction motor (LIM) is employed as the traction motor, during operation its vibration characteristics correlate with the dynamic performance and noise radiation characteristics of the train. This paper conducted tests and established a three-dimensional simulation model of the LIM in a medium and low speed maglev train, to study the motor vibration characteristics by comparative analysis between test and simulation. The analysis results showed that the electromagnetic excitation sources of the train appear in the high-frequency band, with the main characteristic frequencies of 497.33 Hz, 994.33 Hz, 1989.00 Hz, and 3977.67 Hz. The structural modal analysis and vibration harmonic response analysis of the motor showed that the 3rd, 8th, and 18th modal frequencies of the motor structure approximate the frequencies of the electromagnetic excitation sources. As a result, the motor generates resonance at 497.33 Hz and 994.33 Hz under that excitation. The validity of the simulation was confirmed by the corresponding tests. From the perspective of theory, experiment, and simulation, this research can contribute to the optimization of traction systems in the future design of medium and low speed maglev trains.
Variable Flux Direct Torque Control System of Switched Reluctance Motor
Authors: Wu Shitao , Shen Chuanzhang , Xu Jiacheng 
Published: September 2023

Abstract
Direct Torque Control (DTC) strategy is very suitable for controlling Switched Reluctance Motors (SRM) due to its advantages of the simple control structure and fast system response, etc. This paper first analyzes the principle of DTC and establishes the DTC model of three-phase 6/4 SRM by Matlab/Simulink. In this paper, a three-closed-loop variable flux DTC system with velocity as the given quantity is constructed to solve the problem that the stator current of constant flux DTC is too large when the motor is in a steady state. The simulation results show that the variable flux DTC system has a better inhibition effect on the stator current and torque ripple of SRM than the conventional DTC system.
Consensus-based Distributed Bus Voltage Control of in DC Microgrid Clusters
Authors: Chen Ci , Zheng Min , Zhang Yajian , Peng Chen , Xue Fei 
Published: September 2023

Abstract
This paper proposes a consensus-based voltage control strategy for the bus of a DC microgrid cluster. Firstly, the closed-loop dynamics of a DC microgrid cluster bus voltage control system based on the consensus distributed control architecture is described, taking into full account the information exchange delay among the microgrid subsystems. Secondly, by constructing the Lyapunov-Krasovskii functional, the voltage control system asymptotic stability criteria under parameter uncertainties are rigorously derived, and the corresponding controller design criteria are obtained. Simulation results show that compared with the centralized control schemes, the proposed consensus distributed control method can reduce the average settling time by 24.39% and the average integral of absolute error of aggregate deviations by 23.92%.
Active disturbance rejection control of photovoltaic microgrids based on disturbance compensation and feed-forward correction strategy
Authors: Meng Shuqian , Xu Xiaoning , Wang Di 
Published: September 2023

Abstract
Photovoltaic microgrid (PV) is a promising direction of new energy generation technology. However, due to the performance of low-voltage side interface affected by complex disturbance, PV microgrid has the problem of output voltage fluctuation, which will make the power quality not guaranteed. In order to stabilize the low-voltage side load supply, the active disturbance rejection control strategy with disturbance compensation and feed-forward correction (ADRC-DCFC) is proposed. By expanding the conventional state observer (ESO) dimension, a feed-forward correction link for disturbance tracking compensation is added. In contrast, the internal deviations extracted from the system model are actively added to the disturbance compensation link. In addition, a theoretical analysis of its disturbance observation performance and noise suppression performance is presented. Experimental results on a 300-watt test platform verified the accuracy and effectiveness of the ADRC-DCFC.
An Optimization Approach for Distribution Network Planning Strategy Based on Combined Improved Cloud Model and Evidence Theory
Authors: Dong Fude , Liu Hanyu , Xu Yuantu , Zhu Deqiang , Huang Rongjie , Zou Haobin , Quan Huan , Peng Xiangang 
Published: September 2023

Abstract
With the continuous promotion of China’s power reform, higher requirements and standards have been put forward for distribution network investment decisions. However, the current work of distribution network project optimization in China has the problems of high subjectivity of investment decisions, fuzzy evaluation method, and high uncertainty of project optimization. In response to the above problems, this paper proposes a distribution network planning scheme optimization method based on the improved cloud model and evidence theory. Firstly, the optimal index system of the planning scheme is constructed from the dimensions of load transfer capacity, grid structure level, load capacity, investment benefit, social benefit, and life-cycle cost. Secondly, for subjectivity and ambiguity problems, the traditional degree of the membership function is replaced by a cloud model optimized by cloud entropy. Thirdly, the problem of uncertainty is addressed through evidence theory, while the game theory approach is used to identify conflicting evidence for evidence revision and fusion in the case of conflicting evidence arising from traditional evidence theory. Moreover, by improving the TOPSIS method and comparing the distances between the basic probability assignments of each planning scheme and the positive and negative virtual optimal solutions, the final decision results can be determined. Finally, the effectiveness and superiority of the proposed method are verified by experiments.
Design of Automatic Disconnection Device for Non-power Outage Operation of High-voltage Line
Authors: Yang Miao , Chen Wei , Li Jinliang , Wang Zoujun , You Kai , Li Zhe 
Published: September 2023

Abstract
A set of remote electric control disconnection device for high-voltage line with strong adaptability, easy operation, and high safety has been designed to address the problems of multiple spans, wide coverage, and difficulty in coordinating power failure with construction crossing operation. The design process aimed to reduce the weight and improve the reliability of the mechanical structure, and conducted computation and simulation of the traction force and safety load of the electrified tight cable. Based on the designed live disconnection device, experiments were conducted for different spans and cable diameters, while meeting the scope of infrastructure crossing sections. The experiments proved that the designed disconnection device has good effects in practical applications, and can select any point in the straight span to break the cable, in order to achieve safe and convenient uninterrupted operations in power recovery service.
Planning Method of Low-Voltage Distribution Network Applicable to the Access of Multiple Flexible Entities
Authors: Deng Yatuo , Xu Feifei , Fang Zhifa , Yang Jinwei , Yu Gaohan , Xu Qiao 
Published: September 2023

Abstract
Since the establishment of the goal of “peak carbon and carbon neutrality”, various types of emerging loads have been developing rapidly. However, the application scenarios and working principles of various loads are different, and there is no clear standard for distribution network requirements. Thus, the existing low-voltage distribution network planning methods do not take emerging loads into account. Therefore, this paper proposes a low-voltage distribution network planning method that is applicable to the access of multiple flexible subjects. Firstly, the operational characteristics of flexible resources on the power side, user side, and energy storage side are analyzed and studied. Secondly, the low-voltage distribution network planning method applicable to the access of multiple flexible subjects is studied. Finally, the low-voltage distribution network of Song Yang County, Lishui City, is selected for the empirical application.
The Noise of Rail Transport
Authors: Cavacece M 
Published: September 2023

Abstract
The research examines the sources of rail transport noise. Noise depends on the type of locomotives, warning signals, maintenance, and construction equipment. The wheel–to–rail contact of the rolling stock and the locomotives’ propulsion systems are the noise sources. Static and dynamic loads have intensities that depend on the masses and speeds of the trainsets. In addition, static, dynamic loads of the rolling stock, thermal loads, and the action of rainwater stress the ballast. The stresses lead to tensions on the rail that can affect fatigue, wear and tear, and railway line maintenance. Fatigue and wear are related to the intensity of traffic rail traffic, developing an abrasive action of the wheels on the rail and contributing to rail-to-rail misalignment concerning the underlying ballast.
Progress in microsphere-based scaffolds in bone/cartilage tissue engineering
Authors: Pan Qian , Su Weixian , Yao Yongchang 
Published: September 2023

Abstract
Bone/cartilage repair and regeneration have been popular and difficult issues in medical research. Tissue engineering is rapidly evolving to provide new solutions to this problem, and the key point is to design the appropriate scaffold biomaterial. In recent years, microsphere-based scaffolds have been considered suitable scaffold materials for bone/cartilage injury repair because microporous structures can form more internal space for better cell proliferation and other cellular activities, and these composite scaffolds can provide physical/chemical signals for neotissue formation with higher efficiency. This paper reviews the research progress of microsphere-based scaffolds in bone/chondral tissue engineering, briefly introduces types of microspheres made from polymer, inorganic and composite materials, discusses the preparation methods of microspheres and the exploration of suitable microsphere pore size in bone and cartilage tissue engineering, and finally details the application of microsphere-based scaffolds in biomimetic scaffolds, cell proliferation and drug delivery systems.
Relative magnetic helicity in multiply connected domains
Authors: MacTaggart David , Valli Alberto 
Published: September 2023

Abstract
Magnetic helicity is a conserved quantity of ideal magnetohydrodynamics (MHD) that is related to the topology of the magnetic field, and is widely studied in both laboratory and astrophysical plasmas. When the magnetic field has a non-trivial normal component on the boundary of the domain, the classical definition of helicity must be replaced by relative magnetic helicity. The purpose of this work is to review the various definitions of relative helicity and to show that they have a common origin—a general definition of relative helicity in multiply connected domains. We show that this general definition is both gauge-invariant and is conserved in time under ideal MHD, subject only to closed and line-tied boundary conditions. Other, more specific, formulae for relative helicity, that are used frequently in the literature, are shown to follow from the general expression by imposing extra conditions on the magnetic field or its vector potential.