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Proceedings of the International Convention MIPRO

作者： David Bač nar Lolita Leytner Nino Stojković Jonatan Lerga Department of Computer Engineering Faculty of Engineering University of Rijeka Rijeka Croatia Automation and Computer Engineering Department Polytech Angers University of Angers Angers France Department of Automation and Electronics Faculty of Engineering University of Rijeka Rijeka Croatia

ISBN: (数字)9789532331035

ISBN: (纸本)9781665484343

This paper presents an insight into the smart metering field. The paper address specifics of different network hierarchy structures (wide area networks, neighborhood area networks, and home area networks) and topologies used for this purpose (mesh, point-to-point, virtual point-to-point, or broadcast networks). Next, we focus on listing and describing some of the most commonly used communication technologies (both wired and wireless, such as power line communication, public switched telephone network, digital subscriber line, radiofrequency, in-home radio frequency, wireless local area network, or mobile network communications), their characteristics, advantages, and disadvantages utilized for remote and smart metering.

关键词： Wireless communication Wide area networks Radio frequency Wireless LAN Network topology Power line communications Topology

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Platform Stabilization on a Ship under Wave Disturbances

Platform Stabilization on a Ship under Wave Disturbances

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IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics engineering, SIBIRCON

作者： Tam V. Bui Valery D. Yurkevich Faculty of Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russia

ISBN: (纸本)9781665464819

There is a large variety of devices and apparatus of a water vessel for the effective operation of which it is required to provide stabilization of position in space under conditions of wave disturbances, for example, navigation equipment, radar antennas of communication systems. Suppression of the influence of wave disturbances on the operation of this equipment can be provided by placing this equipment on special stabilized platforms. Stabilization of such a platform is provided by means of drives with control system. In this paper, as an example, we consider a stabilized platform with a drive in the form of a DC motor. The control task is to eliminate the influence of wave perturbations on the angle of deviation of the platform relative to the horizon. The paper considers a mathematical model of a stabilized platform on the deck of a watercraft and proposes a new methodology for synthesizing the control system to provide effective suppression of the influence of wave disturbances on the angular position of the platform. The novelty of the proposed approach to the synthesis of the control system consists in the application of the time-scale separation method to calculate the resonant proportional-integral-differential controller.

关键词： Spaceborne radar Simulation Perturbation methods Process control Control systems Harmonic analysis Radar antennas

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Improving Protection Reliability of Multi-source Meshed Power systems by An automation-assisted Overcurrent Protection

Improving Protection Reliability of Multi-source Meshed Powe...

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Mediterranean Electrotechnical Conference (MELECON)

作者： Hossein Ebrahimi Amin Yazdaninejadi Sajjad Golshannavaz Edris Pouresmaeil Department of Electrical Engineering and Automation Aalto University Espoo Finland School of Electrical Engineering Shahid Rajaee Teacher Training University Tehran Iran Faculty of Electrical and Computer Engineering Urmia University Urmia Iran

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

The overcurrent protection of multi-source meshed power systems has been a challenge since their emergence owing to the low fault-current seen by the backup protection. This issue results in reduced protection coverage and consequently protection reliability deficiency. This paper seeks to propose a communication-assisted automated protection scheme which relies on the rapid communication channels of power-line-carrier (PLC) system to improve the protection reliability of power systems. On the other hand, the main overcurrent protection topology stays untouched to avoid further technical complications for system operators. That is, the conventional protection coordination optimization process stays valid for all relay-pairs except for those with lower protection coverage which are the target pairs for the proposed automated PLC-based protection coordination scheme. By this scheme, in the event of a fault, the primary relay communicates with the backup for fault clearing in a proper time. Moreover, the characteristics of the relays are modified to relax the coordination optimization space which results in a better performance of the protection system. The proposed scheme is applied on the IEEE 14-bus testbed and the results are deeply investigated.

关键词： Communication channels Power system reliability Topology Reliability Protection Relays Optimization

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Temperature Characteristics of Oil-Immersed Transformer Based on Fiber Bragg Grating Temperature Sensing Technology

SSRN

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SSRN 2024年

作者： Luo, Chuan Li, Zizhou Yang, Bo Zhao, Zhengang Li, Chuan Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming650500 China Yunnan Key Laboratory of Computer Technology Applications Kunming650500 China

Oil-immersed transformer hot-spot temperature and location directly affects the load capacity and service life of the transformer. The traditional hot-spot temperature measurement is indirect and large deviation. Through the fiber Bragg grating technology, the temperature of the internal components of the transformer under variable operating conditions can be measured directly, reflecting the temperature characteristics of the transformer hot-spot location. Based on this, two full dielectric stress-insensitive FBG temperature sensors with different package forms are designed, with sensitivities of 10.22∼10.65 pm/◦C, linearity of 0.99%∼1.65%, and repeatability of 1.07%∼1.45%. Multiple FBG temperature sensors are installed on the iron-core, windings, and oil channel to build a monitoring system. In the temperature rise test, the temperature inside the transformer variation with space and time under variable operating conditions are obtained. The hot-spot winding temperature rise is 62.9◦C, and the top-oil temperature rise is 39.6◦C. The hot-spot location changes with the operating conditions. © 2024, The Authors. All rights reserved.

关键词： Fiber Bragg gratings

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computer Vision Based Assessment of University Websites' Accessibility and Inclusiveness

Computer Vision Based Assessment of University Websites' Acc...

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IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics engineering, SIBIRCON

作者： Aleksandr S. Pudich Mikhail G. Grif Maxim A. Bakaev Faculty of Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russia

ISBN: (纸本)9781665464819

One of the directions for the development of assistive technologies for people with disabilities (visually impaired, deaf and other categories) is the adaptation of university websites to their needs, often used in an inclusive form of education. According to the law, educational websites in Russia must have dedicated versions for the visually impaired. Our research objective is to evaluate accessibility of the websites and the quality of the versions for visually impaired, mainly automatically, and also to identify the best way to implement such solutions or create accessible websites in general. We have developed a software system for collecting metrics from the two versions of websites: the general one and the one for the visually impaired users. Quantitative metrics based on the HTML code of homepages and based on visual analysis of the homepages screenshots are compared. Metrics are also collected via manual testing. The data was collected for 572 universities websites and was made openly accessible. Correlation analysis of the metrics was carried out. The quality of the versions for the visually impaired users was assessed, recommendations were made for the technical implementation and a standard set of settings was proposed. We collected statistics of used ready-made solutions, as well as of website development tools. We also performed an analysis of the readability of the Russian text in comparison with English on the websites of universities. The paper presents current issues in the field of accessibility of educational sites in Russia, and proposes certain means for their evaluation and guidelines for development of accessible websites.

关键词： Measurement Visualization Codes Correlation Education Manuals Gaze tracking

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A Nonstandard Time-Voltage-Current Characteristic for Overcurrent-Distance Coordination

A Nonstandard Time-Voltage-Current Characteristic for Overcu...

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Mediterranean Electrotechnical Conference (MELECON)

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

The protection coordination of overcurrent and distance relays is a highly constrained optimization problem. The task gets more intricated when the power system is meshed which means different fault current directions in one protective zone. The operation time of distance relays in different zones is usually set to constant values. On the other hand, the standard time-current operation characteristic of overcurrent relays does not give a high freedom degree in the optimization process. These two phenomena jointly result in more constraint violation possibility. This paper proposes a relaxed non-standard time-voltage-current characteristic for overcurrent relays that allows a suitable optimization space and lower constraint violation probability. Moreover, a coordination algorithm is devised which reduces the computational burden and gradually increases the number of constraints in the optimization process. In order to evaluate the performance of the proposed method, the IEEE 39-bus test system is put under simulations that compare the operation time and constraint violations in the conventional and proposed coordination procedure.

关键词： Employment Protective relaying Distribution networks Power systems Time factors Protection Task analysis

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Scaling up the formation of agents with heterogeneous sensing: mixed distance and bearing-only

arXiv

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arXiv 2023年

作者： Chen, Jin Jayawardhana, Bayu de Marina, Hector Garcia The Engineering and Technology Institute Groningen Faculty of Science and Engineering University of Groningen Netherlands Department of Computer Engineer Automation and Robotics CITIC The University of Granada Spain

Unlike the case with identical neighboring agents whose actions are mirrored, the problem of distributed formation control design with heterogeneous sensing is not straightforward. In this paper, we consider the problem of distributed formation control where each agent can only control distances or bearings with its neighbors. We firstly develop a rigidity theory with heterogeneous sensing to ensure that the desired shape is well-posed. Secondly, we propose an iterative method that allows us to scale up the number of agents with heterogeneous sensing. Finally, numerical simulations show the effectiveness of our method. © 2023, CC BY.

关键词： Iterative methods

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Distance-based Formation-Motion Control for Unicycle Agents

Distance-based Formation-Motion Control for Unicycle Agents

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American Control Conference (ACC)

作者： Jin Chen Bayu Jayawardhana Hector Garcia de Marina Engineering and Technology Institute Groningen Faculty of Science and Engineering University of Groningen The Netherlands Department of Computer Engineer Automation and Robotics and With CITIC The University of Granada Spain

We present a distance-based distributed formation-motion control law for unicycle agents that are required to move together at a constant reference speed. The distributed control law consists of the standard distance-based formation gradient control law, which is projected to the longitudinal and angular velocity inputs of the unicycle, and of a linear term that depends on the reference speed. The main contribution of this paper is to realize the consistency of unicycle agents’ orientations without orientation measurement, thereby reducing the possibility of significant orientation measurement errors in real-world applications. We prove and show numerically the local exponential convergence of the unicycle agents to the desired formation, where they eventually move in unison at a constant reference speed.

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A Vision-Based Autonomous AI Tic-Tac-Toe Manipulation System

A Vision-Based Autonomous AI Tic-Tac-Toe Manipulation System

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International Electrical engineering Congress (iEECON)

作者： Panjawee Rakprayoon Akechai Ounsiri Ratchanon Chongyoa Dept. AI Engineering and Data Science Faculty of Engineering Bangkok University Pathum Thani Thailand DNA ROBOTICS and Automation System Company Limited Pathum Thani Thailand Dept. Computer and Robotics Engineering Faculty of Engineering Bangkok University Pathum Thani Thailand

ISBN: (数字)9798350383591

ISBN: (纸本)9798350383607

For an AI tic-tac-toe manipulator application, a real-time vision-based approach is proposed. The technique employs the RealSense camera to capture color and depth images. Combining object detection and image processing techniques to identify X's and O's positions on the game board. However, we recognize that errors can occur during object movement when using only 2D images. To solve this problem, a calibration method between RealSense and the manipulator based on the point-to-plane ICP algorithm is presented. This method provides the 3D object position in the robot coordinate, resulting in increasing the accuracy from 86.25% to 97.25%. Our experiment shows that this technique is highly effective and can accurately identify position objects.

关键词： Three-dimensional displays Robot kinematics Robot vision systems Games Object detection Manipulators Real-time systems

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Adaptive Ensemble Model for Ultra-short-term Wind Power Forecasting 11

Adaptive Ensemble Model for Ultra-short-term Wind Power Fore...

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11th IEEE Data Driven Control and Learning Systems Conference, DDCLS 2022

作者： Li, Yunlong Jin, Huaiping Jin, Huaikang Cao, Yundong Kunming University of Science and Technology Faculty of Information Engineering and Automation Department of Automation Kunming650500 China Yunnan Key Laboratory of Computer Technologies Application Kunming650500 China Huaneng Renewables Co. Ltd. Yunnan Branch Kunming650000 China

ISBN: (数字)9781665496759

ISBN: (纸本)9781665496759

Stable and reliable wind power forecasting is of great significance for grid dispatching. However, wind power has strong nonlinear characteristics. Its amount of historical data is very large, and traditional machine learning methods cannot fit the nonlinear relationship well. Furthermore, owing to the seasonality and periodicity of the wind power, the performance of the offline model inevitably deteriorates. To address these problems, this study proposes an adaptive ensemble model for ultra-short-term wind power forecasting. First, a long short-term memory (LSTM) network is established with historical wind power data for an entire year to ensure a strong generalization performance. Second, local weighted partial least squares (LWPLS) were used to obtain LSTM network prediction errors in real time by adaptive modeling and further improving its prediction accuracy. In addition, just-in-time learning (JITL) is used to ensure the adaptability of forecasting using LWPLS. Finally, to fully integrate the prediction advantages of different prediction models, a random forest (RF) was used to transform the determination of the ensemble weight into a three-classification problem. The adaptive fusion of the three different forecasting mechanisms is realized by weighting through the posterior probability of classification. Finally, the effectiveness and superiority of the proposed method are verified in a practical case. © 2022 IEEE.

关键词： Error correction

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