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Modeling and Simulating more efficient and reliable fuel cell vehicles through enhancing the integration of the 6kW PEM fuel cell stack with DC/DC boost converter and BLDC motor

Modeling and Simulating more efficient and reliable fuel cel...

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Power engineering Conference (SAUPEC), Southern African Universities

作者： Olona Mtumka Senthil Krishnamurthy Department of Electrical Electronic and Computer Engineering Center for Intelligent Systems and Emerging Technologies Cape Peninsula University of Technology Bellville Cape Town South Africa

ISBN: (数字)9798331535162

ISBN: (纸本)9798331535179

This study focuses on enhancing the integration of the PEM fuel cell, DC/DC boost converter, and BLDC motor, which help to develop more efficient and dependable fuel cell vehicles. The development of renewable energy sources for power generation has received much attention due to the depletion of fossil fuel supplies worldwide and economic difficulties. Fuel cells are one of the most efficient and cleanest power generation methods. Polymer electrolyte membrane (PEM) fuel cell is the preferred type of fuel cell for vehicles because of its high energy density, fast start-up, and lack of pollution. This paper aims to model and simulate a PEM fuel cell stack to power a Brushless DC (BLDC) motor for a fuel cell vehicle to reduce emissions in the transportation sectors. A boost converter is implemented to boost the output voltage of the PEM fuel cell stack to 100 V. The paper utilizes the trapezoidal commutation of the BLDC motor to drive the inverter. The trapezoidal commutation uses the six-switching technique to control the inverter's phase currents. The variation of fuel flow rate and drive cycle are included to observe the effect on the operation of the fuel cell stack. The paper presents the modeling and simulation of the PEM Fuel cell stack to improve power conversion, energy management, and vehicle control, helping to make fuel cell vehicles more viable for widespread adoption in the future.

关键词： Renewable energy sources Commutation Hydrogen Fuel cells Transportation Reliability engineering Fuel cell vehicles Inverters Power conversion Power generation

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Electric Vehicle Charging Management in Smart Energy Communities to Increase Renewable Energy Hosting Capacity 11

Electric Vehicle Charging Management in Smart Energy Communi...

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Song, Hyunwoo Lee, Yeongsang Seo, Gab-Su Won, Dongjun Inha University Department of Electrical and Computer Engineering Incheon Korea Republic of National Renewable Energy Laboratory Power Systems Engineering Center GoldenCO80401 United States

ISBN: (纸本)9788957083505

Abnormal climates due to global warming have emerged as a big concern in the global community. To mitigate climate change and achieve sustainability, distributed energy resources (DERs), including solar and wind, have been recently deployed in power systems. As the penetration level of DERs has increased, however, it caused a multitude of issues in the power systems, such as voltage fluctuation in the distribution network limiting renewable hosting capacity. On the other hand, the electric vehicle (EV) industry is rapidly growing to facilitate the transition to a carbon-neutral community, illuminating the potential of EVs as a flexible grid asset to mitigate some of the issues and improve grid operation, if properly exploited. To explore the potential of EVs, this paper proposes an EV scheduling strategy. By using an optimal EV charging scheduling proposed, distribution system operators (DSOs) can minimize their operating costs and stably operate the system with a high level of DERs. To validate the method, a modified IEEE 33-bus system with DERs is developed. The case study shows the proposed scheduling strategizes EV charging to reduce the cost of PV curtailment. In the study, the method outperforms the renewable-only case with curtailment by 4.97% in DSO cost. It also demonstrates its potential to increase the renewable hosting capacity by harmonizing EV charging with renewables. © 2023 The Korean Institute of Power Electronics.

关键词： Electric vehicles

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Not so griddy: Internal representations of RNNs path integrating more than one agent 38

Not so griddy: Internal representations of RNNs path integra...

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38th Conference on Neural Information Processing systems, NeurIPS 2024

作者： Redman, William T. Acosta, Francisco Acosta-Mendoza, Santiago Miolane, Nina Intelligent Systems Center Johns Hopkins Applied Physics Laboratory United States Department of Physics University of California Santa Barbara United States Dynamical Neuroscience University of California Santa Barbara United States Department of Electrical & Computer Engineering University of California Santa Barbara United States

Success in collaborative and competitive environments, where agents must work with or against each other, requires individuals to encode the position and trajectory of themselves and others. Decades of neurophysiological experiments have shed light on how brain regions [e.g., medial entorhinal cortex (MEC), hippocampus] encode the self's position and trajectory. However, it has only recently been discovered that MEC and hippocampus are modulated by the positions and trajectories of others. To understand how encoding spatial information of multiple agents shapes neural representations, we train a recurrent neural network (RNN) model that captures properties of MEC to path integrate trajectories of two agents simultaneously navigating the same environment. We find significant differences between these RNNs and those trained to path integrate only a single agent. At the individual unit level, RNNs trained to path integrate more than one agent develop weaker grid responses, stronger border responses, and tuning for the relative position of the two agents. At the population level, they develop more distributed and robust representations, with changes in network dynamics and manifold topology. Our results provide testable predictions and open new directions with which to study the neural computations supporting spatial navigation. © 2024 Neural information processing systems foundation. All rights reserved.

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Inverse Design Method of Hyperuniform Materials Using System Factorization

Inverse Design Method of Hyperuniform Materials Using System...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Kunwoo Park Ikbeom Lee Sunk Yu Department of Electrical and Computer Engineering Intelligent Wave Systems Laboratory Seoul National University Seoul Korea

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Design methodology Lasers and electrooptics Electro-optical waveguides

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Efficient Recursive Total Least Mean Fourth Algorithm 20

Efficient Recursive Total Least Mean Fourth Algorithm

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20th International Multi-Conference on systems, Signals and Devices, SSD 2023

作者： Aliyu, Kabiru N. Mohamed, Mohamed Hafez Lawal, Abdulmajid Muqaibel, Ali Moinuddin, Muhammad Zerguine, Azzedine Kind Fahd University of Petroleum and Minerals Department of Electrical Engineering The Center for Communication Systems and Sensing Dhahran31261 Saudi Arabia King Abdulaziz University Department of Electrical and Computer Engineering Jeddah21859 Saudi Arabia

ISBN: (纸本)9798350332568

In this work, an iterative total least mean fourth (TLMF) algorithm is devised to solve adaptive filtering problems when both the input and output signals are corrupted with noise. The proposed algorithm is based on a stochastic approach related to the existing total least mean square (TLMS) algorithm. The cost function of the TLMF is defined in terms of the fourth power of the error and minimized iteratively to reach the optimal weight solution. The unknown system is evaluated at various levels of signal-to-noise ratio (SNR). The simulation results showed that the proposed algorithm produced interesting results when both the noise is white or coloured. © 2023 IEEE.

关键词： Adaptive filtering

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Design of Wave Scattering From Gain and Loss Disordered Materials

Design of Wave Scattering From Gain and Loss Disordered Mate...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Ikbeom Lee Kunwoo Park Sunkyu Yu Department of Electrical and Computer Engineering Intelligent Wave Systems Laboratory Seoul National University Seoul Korea

We propose the design of scattering from gain and loss materials using the structure factor. Increased degrees of freedom in the structure factor allow the suppression across the target momentum space.

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Scattering Lasers and electrooptics Electro-optical waveguides

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Next-Generation Satellite IoT Networks: A HAPS-Enabled Solution to Enhance Optical Data Transfer 35

Next-Generation Satellite IoT Networks: A HAPS-Enabled Solut...

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35th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2024

作者： Fettes, Ethan Madoery, Pablo G. Yanikomeroglu, Halim Kurt, Gunes Karabulut Bellinger, Colin Martel, Stephane Ahmed, Khaled Siddiqui, Sameera Lab Department of Systems and Computer Engineering Canada Polytechnique Montréal Poly-Grames Research Center Department of Electrical Engineering Montréal Canada National Research Council Canada Canada Satellite Systems Mda Canada Defence Research and Development Canada Canada

ISBN: (纸本)9798350362244

For decades, satellites have facilitated remote internet of things (IoT) services. However, the recent proliferation of increasingly capable sensors and a surge in the number deployed, has led to a substantial growth in the volume of data that needs to be transmitted via satellites. In response to this growing demand, free space optical communication systems have been proposed, as they allow for the use of large bandwidths of unlicensed spectrum, enabling high data rates. However, optical communications are highly vulnerable to weather-induced disruptions, thereby limiting their high potential. This paper proposes the use of high altitude platform station (HAPS) systems in conjunction with delay-tolerant networking techniques to increase the amount of data that can be transmitted to the ground from satellites when compared to the use of traditional ground station network architectures. The architectural proposal is evaluated in terms of delivery ratio and buffer occupancy, and the subsequent discussion analyzes the advantages, challenges and potential areas for future research. © 2024 IEEE.

关键词： Delay tolerant networks

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Lattice Design for Multiple Topologically Protected Edge Modes

Lattice Design for Multiple Topologically Protected Edge Mod...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Gyunghun Kim Joseph Suh Dayeong Lee Namkyoo Park Sunkyu Yu Department of Electrical and Computer Engineering Intelligent Wave Systems Laboratory Seoul National University Seoul Korea Department of Electrical and Computer Engineering Photonic Systems Laboratory Seoul National University Seoul Korea

We propose the lattice design that allows multiple topologically protected edge modes. The scattering between these modes, which is linear, energy preserving, and robust against local disorders, is discussed in terms ... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Lattices Scattering Signal processing Lasers and electrooptics Laser modes Electro-optical waveguides

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Digital Twin Ancient Architecture: The Exploration of the Digital Protection of Ancient Architecture

Digital Twin Ancient Architecture: The Exploration of the Di...

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作者： Li, Shanglin Lin, Anping School of Computer Science and Artificial Intelligence Xiangnan University Hunan Chenzhou423000 China Hunan Engineering Research Center of Advanced Embedded Computing and Intelligent Medical Systems Hunan Chenzhou China School of Physics and Electronic Electrical Engineering Xiangnan University Hunan Chenzhou China

The digital protection of ancient architectures has achieved important achievements. However, technology development has encountered a bottleneck. The main problem is that the digitization of ancient buildings is limited to building static and isolated three-dimensional models, which cannot meet the increasing professional requirements of digital protection. To solve the above problems, the concept of digital twin ancient architecture (DTAA) is proposed, focusing on the high-dimensional data integration method of the DTAA, as well as the construction method and technical route. Finally, the development and application of digital twin ancient architecture are discussed. The proposed method can bring new ideas to the field of digital protection of ancient architectures. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： 3D modeling

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Adaptive Robust Control Integrated With Gaussian Processes for Quadrotors: Enhanced Accuracy, Fault Tolerance and Anti-Disturbance

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IEEE Transactions on systems, Man, and Cybernetics: systems 2025年第5期55卷 3235-3248页

作者： Liang, Weisheng Amer, Abdelhakim Mehndiratta, Mohit Chen, Zheng Yao, Bin Kayacan, Erdal Zhejiang University State Key Laboratory of Fluid Power and Mechatronic Systems Hangzhou310027 China Aarhus University Artificial Intelligence in Robotics Laboratory Department of Electrical and Computer Engineering Aarhus8000 Denmark GIM Robotics Espoo02650 Finland Zhejiang University Ocean College Ocean Research Center of Zhoushan Zhoushan316021 China Purdue University School of Mechanical Engineering West Lafayette47907 United States Department of Electrical Engineering and Information Technology Paderborn33098 Germany

With increasingly challenging applications for quadrotors, higher requirements are emerging for tracking accuracy and safety. While high accuracy is a prerequisite for complex tasks, safety is ensured through tolerance to actuator faults and resistance to external disturbances. In this article, adaptive robust control (ARC) integrated with Gaussian processes (GPs), i.e., ARC-GP, is proposed to achieve enhanced accuracy, fault tolerance, and anti-disturbance. These three requirements are interrelated and affected by uncertainties. The primary idea of this article is to categorize uncertainties into parametric and nonparametric types, which are then addressed through parameter adaptation and GP, respectively. First, a detailed dynamic model is established, including actuator models that reflect different types of faults corresponding to changes in different physical parameters. Then, parameter adaptation is designed, with direct and indirect methods adopted for different parameters. In particular, the actuator parameters are effectively estimated to achieve targeted fault compensation. Regarding GP for nonparametric uncertainties, its model parameters are also updated via parameter adaptation. The GP thereby also learns parameter estimation errors along with external disturbances. Accordingly, ARC controllers are designed, for which robust feedback terms are constructed to further mitigate uncertainties on the basis of the covariances predicted by GP. The experiments demonstrate that the proposed ARC-GP can actively tolerate various types of actuator faults and better resist wind disturbances. © 2013 IEEE.

关键词： Robust control

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