检索结果-内蒙古大学图书馆

IEEE PES Innovative Smart Grid technologies Conference Europe (ISGT Europe)

作者： J. M. Rodrigues F. O. Resende C. L. Moreira Institute of Engineering and Computer Systems INESC-Porto Portugal University of Porto Porto Portugal

This paper proposes technical solutions that can be implemented in variable speed permanent magnet synchronous generators driven wind turbine systems aiming to mitigate high voltage problems in low voltage MicroGrids by controlling the active power output. Due to the limited control capability of these systems, controlling the output power to prevent voltage rise will require the local accommodation of the generation surplus. For this purpose, additional control functionalities are developed to be integrated in the control systems of the power electronic based interfaces. Their performance is evaluated through numerical simulations performed in Matlab ® /Simulink ® environment and considering the detailed models of the power electronic converters. The results obtained demonstrate the effectiveness of the proposed control functionalities.

关键词： Voltage control Control systems Wind turbines Rotors Wind power generation Batteries

来源：评论

学校读者我要写书评

暂无评论

Automatic Identification of Public Lighting Failures in Satellite Images: A Case Study in Seville, Spain

Automatic Identification of Public Lighting Failures in Sate...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Ana Cláudia Teixeira Leonor Batista Gabriel Carneiro António Cunha Joaquim J. Sousa University of Trás-os-Montes and Alto Douro Vila Real Portugal Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Porto Portugal

Public lighting is crucial for maintaining the safety and well-being of communities. Current inspection methods involve examining the luminaires during the day, but this approach has drawbacks, including energy consumption, delay in detecting issues, and high costs and time investment. Utilising deep learning based automatic detection is an advanced method that can be used for identifying and locating issues in this field. This study aims to use deep learning to automatically detect burnt-out street lights, using Seville (Spain) as a case study. The study uses high-resolution night time imagery from the JL1-3B satellite to create a dataset called NLight, which is then divided into three subsets: NL1, NL2, and NT. The NL1 and NL2 datasets are used to train and evaluate YOLOv5 and YOLOv7 segmentation models for instance segmentation of streets. And then, distance outliers were detected to find the lights off. Finally, the NT dataset is used to evaluate the effectiveness of the proposed methodology. The study finds that YOLOv5 achieved a mask mAP of 57.7%, and the proposed methodology had a precision of 30.8% and a recall of 28.3%. The main goal of this work is accomplished, but there is still space for future work to improve the methodology.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Learning to Play Precision Ball Sports from scratch: a Deep Reinforcement Learning Approach

Learning to Play Precision Ball Sports from scratch: a Deep ...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： Liliana Antão Armando Sousa Luís Paulo Reis Gil Gonçalves SYSTEC - Research Center for Systems and Technologies FEUP - Faculty of Engineering University of Porto INESC TEC-INESC Technology and Science LIACC - Artificial Intelligence and Computer Science Laboratory

ISBN: (数字)9781728169262

ISBN: (纸本)9781728169279

Over the last years, robotics has increased its interest in learning human-like behaviors and activities. One of the most common actions searched, as well as one of the most fun to replicate, is the ability to play sports. This has been made possible with the steady increase of automated learning, encouraged by the tremendous developments in computational power and improved reinforcement learning (RL) *** paper implements a beginner Robot player for precision ball sports like boccia and bocce. A new simulated environment (PrecisionBall) is created, and a seven degree-of-freedom (DoF) robotic arm, is able to learn from scratch how to win the game and throw different types of balls towards the goal (the jack), using deep reinforcement learning. The environment is compliant with OpenAI Gym, using the MuJoCo realistic physics engine for a realistic simulation. A brief comparison of the convergence of different RL algorithms is performed. Several ball weights and various types of materials correspondent to bocce and boccia are tested, as well as different friction coefficients. Results show that the robot achieves a maximum success rate of 92.7% and mean of 75.7% for the best case. While learning to play these sports with the DDPG+HER algorithm, the robotic agent acquired some relevant skills that allowed it to win.

关键词： Machine learning Games Lifting equipment Task analysis Manipulators

来源：评论

学校读者我要写书评

暂无评论

Open-innovation practices: Diversity in portuguese smes

引用

Journal of Open Innovation: technology, Market, and Complexity 2021年第3期7卷 169页

作者： Almeida, Fernando Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Polytechnic Institute of Gaya (ISPGAYA) University of Porto Porto 4000-008 Portugal

This study aimed to explore the diversity of open-innovation practices that are adopted in Portuguese SMEs considering the outside-in, inside-out, and coupled paradigms. A quantitative study was carried out considering a sample of 187 Portuguese SMEs. The findings revealed that these organizations favored the adoption of the outside-in paradigm. The inside-out model was the least relevant, especially for smaller companies (i.e., small and micro-companies). The most adopted outside-in practices were the integration of external knowledge from suppliers and clients;in the inside-out model, licensing processes were more important;while in the coupled model, joint ventures and network consortiums stood out. The increase in the innovation capacity of these organizations was highlighted as the most relevant benefit, while the lack of resources and difficulties in integrating knowledge emerged as challenges. This study is especially relevant for the establishment of public-support policies that promote the involvement of Portuguese SMEs in open-innovation processes. © 2021 by the author. Licensee MDPI, Basel, Switzerland.

关键词： Coupled model External knowledge Inside-out model Open innovation Openness Outside-in model

来源：评论

学校读者我要写书评

暂无评论

Building Flexibility Bidding Curves for Energy Communities

Building Flexibility Bidding Curves for Energy Communities

引用

International Conference on European Electricity Market, EEM

作者： Luís Rodrigues João Mello Kamalanathan Ganesan Ricardo Silva José Villar INESC TEC - Institute for Systems and Computer Engineering Technology and Science Faculdade de Engenharia da Universidade do Porto R&D Nester Portugal

ISBN: (数字)9798350381740

ISBN: (纸本)9798350381757

The integration of renewable generation requires new sources of flexibility, including the flexibility from distributed resources that can be unlocked via local flexibility markets (LFMs). In these markets, aggregators (AGGs) offer the flexibility from their portfolios to the flexibility requesting parties (FRP), i.e. system operators or other balancing requesting parties. To bid in LFMs and manage market uncertainty, AGGs must compute the flexibility they are willing to offer at each possible flexibility market price, by optimizing their portfolios. This paper proposes a 2-stage methodology to compute the flexibility bidding curve that an energy community can send to a LFM when behaving as an AGG of its members resources. At stage 1, the energy community (EC) manager computes the optimal EC operation without flexibility provision, minimizing the EC energy bill, and serving as the baseline to verify the flexibility provision. Then, at stage 2, for each possible flexibility price, the EC manager computes the optimal flexibility to be offered, minimizing the EC energy bill but including the flexibility provision incomes, to build the flexibility bidding curve.

关键词： Renewable energy sources Uncertainty Optimization models Europe Pricing Electric vehicles Regulation

来源：评论

学校读者我要写书评

暂无评论

Assessment of Demand Response Impact on the Frequency Stability of Low-Inertia Power systems

Assessment of Demand Response Impact on the Frequency Stabil...

引用

Power tech Conference

作者： Rodrigo da Cunha Afonso João Abel Peças Lopes Department of Electrical and Computer Engineering Faculty of Engineering University of Porto Porto Portugal Center for Power and Energy Systems INESC-TEC Porto Portugal

This paper describes a study that sought to analyse the impact of an active demand response on the frequency stability of the Iberian Peninsula for operation scenarios extending to 2040. For that purpose, one developed dynamic models for primary and secondary frequency control provision from demand-side resources, namely Electric Vehicles (EV), thermostatically controlled loads (TCL), and electrolysers. Those models were developed under a Matlab/Simulink environment, and added to a two-area control model representative of the Iberian Peninsula interconnected to the CESA area. Then, one ran simulations of reference disturbances (loss of a large generator or distributed generation) in the developed platform, once it was fully implemented.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Reconstruction and generation of virtual heritage sites

引用

Digital Applications in Archaeology and Cultural Heritage 2014年第3-4期1卷 92-102页

作者： Rodrigues, N. Magalhães, L. Moura, J. Chalmers, A. School of Technology and Management Computer Science and Communication Research Centre Polytechnic Institute of Leiria Leiria Portugal Universidade de Trás-os-Montes e Alto Douro Vila Real Portugal Institute for Systems and Computer Engineering of Porto (INESC Porto) Porto Portugal Digital Laboratory WMG University of Warwick United Kingdom

Traditionally procedural modelling techniques are commonly used to generate new structures and are presently established in several areas such as video games and computer animated movies. However they may also be used in heritage applications to efficiently produce models of non-existing worlds for which there is some kind of knowledge (e.g. floor plans, photographs) to support the reconstruction of realistic environments. Similarly they may also be used to support the generation of distinct possibilities that allow experts to draw some conclusions or conceive different hypotheses about lost worlds. The present paper shows the benefits and constraints that may arise from the use of such techniques in virtual heritage applications. Furthermore, a whole method is proposed, for the reconstruction and generation of virtual heritage traversable house models, provided through the means of a grammar, demonstrated with the reconstruction and generation of several Roman houses from the heritage site of Conimbriga, Portugal. © 2014 Elsevier Ltd. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Flexibility-Oriented Scheduling of Microgrids Considering the Risk of Uncertainties

Flexibility-Oriented Scheduling of Microgrids Considering th...

引用

International Conference on Smart Energy systems and technologies (SEST)

作者： Mohammad MansourLakouraj Mohammad Sadegh Javadi João P. S. Catalão Department of Electrical and Computer Engineering Babol Noshirvani University of Technology Babol Iran Institute for Systems and Computer Engineering Technology and Science (INESC TEC) Porto Portugal Faculty of Engineering University of Porto (FEUP) Porto Portugal

ISBN: (数字)9781728147017

ISBN: (纸本)9781728147024

Increasing the penetration of renewable resources has aggravated the operational flexibility at distribution level. In this study, a flexibility-oriented scheduling of microgrids (MGs) is suggested to reduce the power fluctuations in distribution feeders caused by the high penetration of wind turbines (WTs) in MGs. A flexibility constraint as viable and practical solution is used in MG scheduling to address this challenge. The presented scheduling model, implemented using mixed integer linear programming (MILP) and a stochastic framework, exercises risk constraints to capture the uncertainties associated with wind turbines, loads and market prices. The effectiveness of the model is investigated on a MG with high penetration of WTs in the presence of demand response (DR) and energy storage systems (ESSs). Numerical studies show the influence of risk parameters' changing on operation costs. In addition, the flexibility constraint mitigates the sharp variation of the net load at distribution level, which improves the flexibility of the distribution system.

关键词： Uncertainty Stochastic processes Wind turbines Scheduling Load modeling Power systems Processor scheduling

来源：评论

学校读者我要写书评

暂无评论

tec4SEA — A modular platform for research, test and validation of technologies supporting a sustainable blue economy

TEC4SEA — A modular platform for research, test and validat...

引用

OCEANS

作者： Paulo Mónica Alfredo Martins Augustin Olivier Aníbal Matos José Miguel Almeida Nuno Cruz José Carlos Alves Henrique Salgado Luís Pessoa Pedro Jorge Rui Campos Manuel Ricardo Carlos Pinho António Silva Sérgio Jesus Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto ISEP - School of Engineering Porto Polytechnic Institute Porto Portugal Department of Electrical and Computer Engineering University of Porto Porto Portugal Campus de Gambelas University of Algarve Portugal

This paper presents the tec4SEA research infrastructure created in Portugal to support research, development, and validation of marine technologies. It is a multidisciplinary open platform, capable of supporting research, development, and test of marine robotics, telecommunications, and sensing technologies for monitoring and operating in the ocean environment. Due to the installed research facilities and its privileged geographic location, it allows fast access to deep sea, and can support multidisciplinary research, enabling full validation and evaluation of technological solutions designed for the ocean environment. It is a vertically integrated infrastructure, in the sense that it possesses a set of skills and resources which range from pure conceptual research to field deployment missions, with strong industrial and logistic capacities in the middle tier of prototype production. tec4SEA is open to the entire scientific and enterprise community, with a free access policy for researchers affiliated with the research units that ensure its maintenance and sustainability. The paper describes the infrastructure in detail, and discusses associated research programs, providing a strategic vision for deep sea research initiatives, within the context of both the Portuguese National Ocean Strategy and European Strategy frameworks.

关键词： Oceans Optical sensors Robot sensing systems Europe Optical imaging

来源：评论

学校读者我要写书评

暂无评论

Long-time Resistance and Impurities Influence on Hydrogen Sensors Based on Palladium Expansion and Bragg Gratings 28

Long-time Resistance and Impurities Influence on Hydrogen Se...

引用

28th International Conference on Optical Fiber Sensors, OFS 2023

作者： Almeida, Miguel A.S. de Almeida, J.M.M.M. Coelho, Luís C.C. INESC TEC Institute of Systems and Computer Engineering Technology and Science Department of Physics Faculty of Sciences University of Porto Rua do Campo Alegre Porto4169-007 Portugal Department of Physics School of Sciences and Technology University of Trás-os-Montes e Alto Douro Vila Real5001-801 Portugal

An optical fiber sensor for hydrogen detection is presented. It is based on processed fiber Bragg gratings coated with palladium thin films where its expansion due to the hydrogen adsorption is monitored as strain mea... 详细信息

ISBN: (纸本)9781957171302

关键词： Palladium

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：