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HIGH-FREQUENCY IMPEDANCE modeling AND ANALYSIS OF LCC-HVDC TRANSMISSION system 20

HIGH-FREQUENCY IMPEDANCE MODELING AND ANALYSIS OF LCC-HVDC T...

引用

20th International conference on AC and DC Power Transmission 2024, ACDC 2024

作者： Cao, Yuhang Sha, Licheng Dong, Nan Wang, Wei Zha, Xiaoming Tian, Zhen School of Electrical Engineering and Automation Wuhan University Wuhan China State Grid Beijing Electric Power Company Beijing China

ISBN: (纸本)9781837242672

High voltage direct current (LCC-HVDC) technology based on grid commutation converter is increasingly used to connect large-scale new energy to the grid and transmit power over long distances. However, high-frequency oscillation in the output system of HVDC can limit power transmission capacity and impact the safe operation of the power grid. Existing impedance modeling often fails to consider the influence of the receiving end converter station and power network strength. To accurately analyze the impedance characteristics of LCC-HVDC systems, this thesis establishes an impedance analytical model that considers the impact of the receiving end. Using double Fourier transform, the frequency domain expression of the switching function is obtained and combined with the DC transmission line model to establish the impedance model of the LCC-HVDC transmission system. the analysis of parameters on the impedance characteristics of the converter station provides a basis for understanding the oscillation mechanism. © the Institution of Engineering & Technology 2024.

关键词： Frequency domain analysis

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Research and Implementation of Education Management Information system Based on Association Mining Technology 24

Research and Implementation of Education Management Informat...

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2024 International conference on Intelligent Education and Computer Technology, IECT 2024

作者： Zhang, Huanhuan Wuhan Business University Hubei Wuhan430000 China

ISBN: (纸本)9798400709920

this study focuses on developing an education management information system using association mining technology. Initially, the system's comprehensive framework is crafted, and its overall design is established. Secondly, a system optimization design method is proposed, and an association mining data model is built. Finally, an independent education management database is designed through induction, analysis, and summarization. the obtained findings reveal that as the education management information system described in this study operates continuously, there is a notable rise in the concurrent connections index. By the 20th second, the simultaneous connections peak, reaching a maximum of 882 users, surpassing the count of student users engaged in experimental teaching within the school. Prove that the educational management information system based on association mining technology can meet practical applications, and the system's experimental teaching informationization recommendation effect is outstanding. © 2024 ACM.

关键词： Data mining

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Energy Management system for Electric Vehicle Charging Stations with Photovoltaic Integration in Weak Grids 20

Energy Management System for Electric Vehicle Charging Stati...

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20th IEEE India Council International conference, INDICON 2023

作者： Kar, Rahul Raj Ganpatrao Wandhare, Rupesh IIT- Hyderabad India

ISBN: (纸本)9798350305593

Electric vehicles are becoming popular due to their eco-friendly, sustainable, and cost-effective nature, addressing fuel depletion, environmental collapse, and challenges. the proposed work aims to design and develop a hybrid charging station for electric vehicles in a weak grid, utilizing both photovoltaic (PV) and grid power sources. the proposed strategy aims to enhance grid energy utilization in diverse operating conditions, ensuring optimal performance. the system uses Maximum Power Point Tracking (MPPT) to charge the electric vehicle (EV) directly with solar energy whenever available. the system automatically adjusts its operational modes when solar energy is not accessible. Power availability and demand scenarios determine the power flow between the PV panels, charging station, and the grid. When there is a weak grid, the converter's power injection or absorption performance suffers significantly. the paper describes the modelling and controller design of the system's different power electronics converters. © 2023 IEEE.

关键词： Energy Management Feed-forward modeling PR-controller Voltage Source Converter (VSC) Weak grid (WG)

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EHA Cascade Sliding Mode Position Control Based on system Virtual Decomposition 1

引用

20th Chinese Intelligent systems conference

作者： Li, Jingyu Guo, Tuanhui Fu, Yongling Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China

ISBN: (数字)9789819786503

ISBN: (纸本)9789819786527;9789819786503;9789819786497

Compared with valve controlled electro-hydraulic servo actuators (SHA), EHA eliminates servo valves and has advantages such as high efficiency and strong pollution resistance. therefore, it has been applied in the main flight control system of aircraft. But Parameter uncertainties, system modeling errors, and external disturbances compromise the control precision and stability of Electro-Hydrostatic Actuators (EHA), directly impacting aircraft flight safety. To mitigate these challenges, a cascade sliding mode control strategy, based on system virtual decomposition, is proposed. EHA is decomposed into mechanical, hydraulic, and motor subsystems. Sliding mode control is employed to attenuate mechanical disturbances, while non-singular terminal sliding mode control is utilized to mitigate hydraulic flow disturbances. the motor subsystem is controlled using the widely adopted Field Oriented Control (FOC) strategy. Stability analysis is conducted via Lyapunov stability analysis. Simulation results demonstrate superior disturbance rejection capa-bilities compared to traditional PID control.

关键词： Electro-hydrostatic actuator parameter uncertainties virtual decomposition and cascade sliding mode control

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optimization of a Two-Stage Logistic system using Hybrid Filtered Beam Search Algorithm 20

Optimization of a Two-Stage Logistic System using Hybrid Fil...

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20th International Industrial Simulation conference (ISC)

作者： Gam, Marwa Hayane, Oussama Lefebvre, Dimitri Univ Le Havre Normandie GREAH F-76600 Le Havre France

ISBN: (纸本)9789492859211

this paper addresses the challenge that consists in integrating local short circuits within a global supply chain. this study is motivated by recent changes in the needs of the costumers that are more and more aware about the development of short circuits to facilitate the distribution of products with low carbon emission. More precisely, this paper formalizes such a coupled logistic system as an optimization problem. the optimization consists of reducing the total distribution costs based on the iterated application of the Hybrid Filtered Beam Search. this algorithm is an aggressive pruning method used for the selective exploration of trees. In this paper, this method is adapted to allocate the adequate vehicles for the distribution of goods and to determine the less expensive circuits of those vehicles. Simulations for a real case study in the region Normandy, France are considered to illustrate the approach.

关键词： Logistic Simulation optimization Hybrid Filtered Beam Search

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Multicore soft error reliability assessment and evaluation of Compiler optimization flag Effects on ARMv7 and ARMv8 20

Multicore soft error reliability assessment and evaluation o...

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20th IEEE India Council International conference, INDICON 2023

作者： Jadhav, Usha Malathi, P. Ost, Luciano Garibotti, Rafael Gava, Jonas D y Patil College of Engineering Dept. of E&tc Engg Akurdi Pune India Loughborough University Loughborough United Kingdom School of Technology Pucrs Brazil Federal University of Rio Grande Do Sul Ufrgs Brazil

ISBN: (纸本)9798350305593

With the fast technological advancement in submicron devices, today's communication systems are more demanding for use of ARM based devices in safety critical systems. Cosmic rays penetrate and can change the data values of register, memory cells causing soft errors. Multi core and Commercial off the shelf architectures are more susceptible to soft errors and changes the order of execution of statements in program. So, reliability is a major concern in such resource constrained environments. this paper inspects, the use of the compiler optimization flag improves the soft error tolerance of programs running on ARM Cortex-M4F and ARM Cortex-A72 processors using virtual platform. the experimental results from 1K fault injections depicts that -Os level improves the soft error resilience of the applications compared to the -O0 level. Also, compared to a single core, dual cores have higher operating system thread management routines, which results in more OMMs and fewer Vanishes. © 2023 IEEE.

关键词： Compiler optimization flag Fault injection Multicore Operating system Reliability Soft error soft error resilience Virtual Platform

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Inference of threshold network models of the tryptophan operon in Escherichia coli 20

Inference of threshold network models of the tryptophan oper...

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20th IEEE conference on Computational Intelligence in Bioinformatics and Computational Biology (IEEE CIBCB)

作者： Ruz, Gonzalo A. Univ Adolfo Ibanez Fac Ingn & Ciencias Santiago Chile Ctr Appl Ecol & Sustainabil CAPES Santiago Chile Data Observ Fdn Santiago Chile

ISBN: (纸本)9798350310177

A recent Boolean model of the tryptophan operon in Escherichia coli has been introduced, which exhibits a desired set of fixed points modeling the operon state being on or off. Nevertheless, when updated synchronously, the model also reveals spurious limit cycles with a larger basin of attraction than the desired fixed points. this paper presents the search via evolutionary computation for threshold network models that exhibit the desired fixed points without any limit cycles. the proposed framework was applied using differential evolution and particle swarm optimization, the latter being the most efficient and effective method based on the results obtained by the simulations. Particle swarm optimization found two correct threshold networks, one of which has only weight values {-1, 0, 1}, making the model more interpretable.

关键词： Boolean network threshold network Evolutionary Computation Tryptophan operon Differential evolution Particle swarm optimization

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Control of the Rotor Nacelle system Based on Genetic Algorithm 20th

Control of the Rotor Nacelle System Based on Genetic Algorit...

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20th Chinese Intelligent systems conference

作者： Ma, Shengkai Chen, Xinmin Chen, Wenlu Wang, Jiqiang Ningbo Univ Fac Mech Engn & Mech Ningbo 315211 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China

ISBN: (纸本)9789819786527;9789819786503;9789819786497

the rotor nacelle is a crucial component of a tilt-rotor UAV, and control stability during its tilting process directly impacts the UAV's flight quality. Traditional PID controller design often relies on manual parameter adjustment based on human experience, which is time-consuming and lacks precision. this study focuses on the rotor nacelle system of the T500 tilt-rotor UAV and establishes a two-inertia dynamics model based on its structural composition. To address the cumbersome PID parameter adjustment, this paper proposes an autotuning method using a genetic algorithm, incorporating comprehensive dynamic performance indexes, and introducing a target optimization fitness function. Simulation results demonstrate that the genetic algorithm can quickly and effectively adjust the PID controller parameters, achieving the desired control effect and providing robust technical support for the safe and stable flight of the tilt-rotor UAV.

关键词： Rotor nacelle system Two-inertia model Genetic algorithm Autotuning parameters

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the Evaluation Model of Pilot Visual Search with Onboard Context-Sensitive Information system 20th

The Evaluation Model of Pilot Visual Search with Onboard Con...

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20th International conference on Engineering Psychology and Cognitive Ergonomics (EPCE) Held as Part of the 25th International conference on Human-Computer Interaction (HCII)

作者： Tan, Wei Wang, Wenqing Sun, Yuan Civil Aviat Univ China Coll Safety Sci & Engn Tianjin 300300 Peoples R China

ISBN: (纸本)9783031353918;9783031353925

this study is based on the attention allocation to investigate the evaluation model of pilot's visual search performance. Based on the SEEV model of attention allocation, the evaluation model of pilot's visual search performance was determined by three factors: expectancy, value and effort. the eye movement indicators such as fixation duration and numbers of fixation were selected to represent the influencing factors in the model, and the expert scoring method was used to determine the weight coefficient of each factor. then, the comparative experiment was designed with the level of information systems (context-sensitive information system and electronic flight manuals) as the independent variable and visual search performance as the dependent variable. the eye-tracking data of 20 airline pilots were recorded in the simulator under each experimental scenario. Finally, the data was substituted into the model to verify its effectiveness and feasibility. the results showed that the pilot visual search performance evaluation model can effectively reflect the level of pilot's visual search performance, and the level of pilot visual search performance in critical areas is effectively improved by using context-sensitive information system when handlingmalfunctions. the model can provide the theoretical reference for the training of standard operating procedures and the optimization of the context-sensitive information system.

关键词： Context-Sensitive Information system Visual search Performance Evaluation Model Eye-tracking Data Attention Distribution Flight Safety

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A Digital LDO with Adaptive Loop Control and Reset-Voltage optimization for Comparator 20

A Digital LDO with Adaptive Loop Control and Reset-Voltage O...

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20th International SoC Design conference (ISOCC)

作者： An, Gwangmyeong Yoon, Juneho Kim, Taeho Jang, Hyunsu Park, Myeongju Kim, Bongsu An, Jongchan Song, Junyoung Incheon Natl Univ Dept Elect Engn Incheon South Korea Bellarmine Coll Preparatory San Jose CA 95126 USA

ISBN: (纸本)9798350327038

this paper presents the implementation of digitally designed low dropout voltage regulator (DLDO) with coarse-fine control and dynamic comparator with optimized reset voltage. the coarse-fine loops based on digital logic adjust the thermal-weighted passgates with automatic loop control to reduce the voltage ripple at the output voltage, and the proposed comparator makes possible to reduce the output error with less than 1mV input voltage difference. With helps of proposed design techniques, the DLDO operates with 200MHz external clock source, and the ripple voltage at the output is 0.49mV. Also, the latency caused by the comparator is reduced within 1 clock cycle, and the setting time when the load current changes from 1mA to 10mA is 904ns. the proposed DLDO is designed using 180nm CMOS process, and the power efficiency is 95.2%.

关键词： DLDO (Digital Low Dropout Regulator Coarse-Fine control Fast transient recovery time comparator

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