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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Liu, Qingxiang Rodriguez, Ezequiel Farivar, Glen G. Townsend, Christopher D. Pou, Josep Leyva, Ramon Nanyang Technological University Energy Research Institute at Ntu Interdisciplinary Graduate Programme Singapore Singapore University of Melbourne Department of Electrical and Electronic Engineering Australia University of Western Australia Department of Electrical Electronic and Computer Engineering Australia Anyang Technological University School of Electrical and Electronic Engineering Singapore Universitat Rovira i Virgili Departament d'Enginyeria Electrònica Elèctrica i Automàtica Tarragona Spain

ISBN: (纸本)9798350316445

This paper formulates a three-clamping-level discontinuous pulsewidth modulation (DPWM) for three-phase cascaded H-bridge static compensators with star configuration. Analytical expressions of capacitor voltage and zero-sequence voltage under the three-clamping-level DPWM are provided considering the inherent capacitor voltage oscillations. Based on the derived expressions, the paper analyses: (i) the inductive operation limits, and (ii) the total harmonic distortion (THD) and weighted THD of the output voltages. The results are compared with the continuous modulation and the conventional two-clamping-level DPWM, showing their different performances. © 2023 IEEE.

关键词： Cascaded H-bridge (CHB) Discontinuous Modulation (DPWM) Static Compensator (StatCom)

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High Voltage Selective Global Flexible Power Point Tracking for Photovoltaic Systems

High Voltage Selective Global Flexible Power Point Tracking ...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Kumaresan, Anusha Tafti, Hossein Dehghani Farivar, Glen G. Beniwal, Neha Yadav Gorla, Naga Brahmendra Pou, Josep Strunz, Kai Energy Research Institute Ntu Interdisciplinary Graduate Programme Nanyang Technological University Singapore University of Western Australia Department of Electrical Electronic and Computer Engineering Australia The University of Melbourne Department of Electrical and Electronic Engineering Victoria3010 Australia Ge Global Research New York United States Indian Institute of Technology Department of Electrical Engineering Kerala Palakkad India Nanyang Technological University School of Electrical and Electronic Engineering Singapore Technische Universität Chair for Sustainable Electric Networks and Sources of Energy Berlin Germany

ISBN: (纸本)9798350316445

To provide frequency support in grid-connected photovoltaic (PV) systems with low inertia, flexible power point tracking (FPPT) control algorithms have been developed in the literature. To achieve this, a power reference obtained from the energy management system is used to control the PV output power. For PV systems to operate with FPPT, the frequent phenomenon of partial shading of PV arrays must be investigated. Among the multiple operating points possible for a given power reference, the one with a high voltage level should be selected in order to minimize the current stress on the semiconductor devices and to reduce the converter thermal stress. This work proposes an improved secant method to achieve this objective, which converges to a voltage reference that is higher than the global maximum power point voltage. The performance of the proposed high voltage selective global FPPT algorithm is validated through simulations in MATLAB-Simulink and experiments conducted on a scaled-down laboratory test setup. © 2023 IEEE.

关键词： Active power control flexible power point tracking frequency support photovoltaic (PV) systems secant algorithm

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300-GHz Beam-Steering Wireless Communication Enabled by 4-Array InGaAs UTC-PD on SiC Substrate and Optical Phased Array

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Journal of Lightwave Technology 2025年

作者： Kamiura, Yoshiki Doi, Ryo Ssali, Hussein Che, Ming Mikami, Yuya Kato, Kazutoshi Kyushu University Department of Electrical and Electronic Engineering Graduate School and Faculty of Information Science and Electrical Engineering Fukuoka819-0395 Japan

This paper presents a high-performance 4-array InGaAs UTC-PD fabricated on a silicon carbide (SiC) substrate, designed to improve thermal management and enhance output power for terahertz (THz) wave applications. The developed 4-array UTC-PD configuration enables precise beam steering at 300 GHz, demonstrating multi-directional wireless communication utilizing On-Off Keying (OOK) modulation. The SiC substrate with thermal conductivity approximately seven times higher than that of conventional indium phosphide (InP) substrates suppresses device overheating, preventing thermal damage and performance degradation even under high photocurrent conditions, while significantly enhancing THz output power. Furthermore, we successfully demonstrated the real-time transmission of uncompressed 4K video, underscoring the feasibility of this system for high-capacity THz wireless communication applications. Finally, Beam-Switching Time Division Multiplexing (BS-TDM) was also implemented and evaluated, demonstrating its potential for efficient resource allocation in next-generation wireless systems. © 2025 IEEE.

关键词： Semiconducting indium phosphide

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A Hybrid Data-Driven Approach Integrating Temporal Fusion Transformer and Soft Actor-Critic Algorithm for Optimal Scheduling of Building Integrated Energy Systems

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Journal of Modern Power Systems and Clean Energy 2025年第3期13卷 878-891页

作者： Ze Hu Peijun Zheng Ka Wing Chan Siqi Bu Ziqing Zhu Xiang Wei Yosuke Nakanishi Department of Electrical and Electronic Engineering The Hong Kong Polytechnic University Hong Kong China Graduate School of Environment and Energy Engineering Waseda University Tokyo Japan

Building integrated energy systems (BIESs) are pivotal for enhancing energy efficiency by accounting for a significant proportion of global energy consumption. Two key barriers that reduce the BIES operational efficiency mainly lie in the renewable generation uncertainty and operational non-convexity of combined heat and power (CHP) units. To this end, this paper proposes a soft actor-critic (SAC) algorithm to solve the scheduling problem of BIES, which overcomes the model non-convexity and shows advantages in robustness and generalization. This paper also adopts a temporal fusion transformer (TFT) to enhance the optimal solution for the SAC algorithm by forecasting the renewable generation and energy demand. The TFT can effectively capture the complex temporal patterns and dependencies that span multiple steps. Furthermore, its forecasting results are interpretable due to the employment of a self-attention layer so as to assist in more trustworthy decision-making in the SAC algorithm. The proposed hybrid data-driven approach integrating TFT and SAC algorithm, i.e., TFT-SAC approach, is trained and tested on a real-world dataset to validate its superior performance in reducing the energy cost and computational time compared with the benchmark approaches. The generalization performance for the scheduling policy, as well as the sensitivity analysis, are examined in the case studies.

关键词： Optimization Thin film transistors Uncertainty Heating systems Energy consumption Forecasting Decision making Cogeneration Job shop scheduling Buildings

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Disturbance Rejection Ability Comparison for Different Solid-State Transformer Control Strategies

Disturbance Rejection Ability Comparison for Different Solid...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Sarda, Radhika Rodriguez, Ezequiel Farivar, Glen G. Pou, Josep Sriram, V.B. Tripathi, Anshuman Nanyang Technological University Energy Research Institute at NTU Interdisciplinary Graduate Programme Singapore Nanyang Technological University Energy Research Institute at Ntu Singapore University of Melbourne Department of Electrical and Electronic Engineering Melbourne Australia Nanyang Technological University School of Electrical and Electronic Engineering Singapore

ISBN: (纸本)9798350316445

The conventional control of a three-stage cascaded solid-state transformer (SST) is designed assuming decoupled stages. With high-capacitance dc-link capacitors, it is possible to ignore interactions among the stages. However, in practice, when finite-size capacitance values are used, the interactions among stages are nonnegligible, potentially leading to over-voltage or under-voltage phenomena on the high-voltage dc-link capacitors. In this view, this paper compares various SST control strategies based on their disturbance rejection ability. The analysis illustrates the influence of the control variables and bandwidth chosen for each SST stage on the capacitor voltages during load transients. Small-signal analysis is provided to compare the different SST control methods. The analysis is confirmed by simulation results using PLECS. © 2023 IEEE.

关键词： control Disturbance rejection solid-state transformer

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Body Motion Noise Reduction of Silent Speech Recognition Using Facial Surface EMG

Body Motion Noise Reduction of Silent Speech Recognition Usi...

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2025 IEEE/SICE International Symposium on System Integration, SII 2025

作者： Kimoto, Ryosuke Ohhira, Takashi Hashimoto, Hideki Chuo University Graduate School of Science and Engineering 1-13-27 Kasuga Bunkyo-ku Tokyo112-8551 Japan Chuo University Department of Electrical Electronic and Communication Engineering 1-13-27 Kasuga Bunkyo-ku Tokyo112-8551 Japan

ISBN: (纸本)9798331531614

This paper proposes a method for reducing body motion noise in silent speech recognition (SSR) systems using facial muscle information. Several SSR methods have been developed that utilize facial muscle information for speech recognition. However, these methods are limited to steady-state conditions. The accuracy of these methods is significantly degraded by body motion noise from daily movements mixed with EMG signals, making word identification impossible under such conditions. To address the body motion problem in SSR systems, this paper proposes an improved SSR system and demonstrates its effectiveness. © 2025 IEEE.

关键词： Noise abatement

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Mechanism of Threshold Voltage Instability in Double Gate α-IGZO Nanosheet TFT under Bias and Temperature Stress

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IEEE Journal of the Electron Devices Society 2024年 12卷 464-471页

作者： Aslam, Muhammad Chang, Shu-Wei Chen, Yi-Ho Lee, Yao-Jen Li, Yiming Lee, Wen-Hsi Parallel and Scientific Computing Laboratory National Yang Ming Chiao Tung University Hsinchu300093 Taiwan Electrical Engineering and Computer Science International Graduate Program National Yang Ming Chiao Tung University Hsinchu300093 Taiwan Department of Electrical Engineering National Cheng Kung University Tainan City701401 Taiwan Institute of Pioneer Semiconductor Innovation Industry Academic Innovation School National Yang Ming Chiao Tung University Hsinchu300093 Taiwan Department of Electronics and Electrical Engineering National Yang Ming Chiao Tung University Hsinchu300093 Taiwan Institute of Communications Engineering National Yang Ming Chiao Tung University Hsinchu300093 Taiwan

Amorphous indium gallium zinc oxide (a-IGZO)-based thin film transistors (TFTs) are increasingly becoming popular because of their potential in futuristic applications, including CMOS technology. Given the demand for CMOS-compatible, ultra-scaled, reliable, and high-performing devices, we fabricate and analyze scaled-channel a-IGZO-TFTs with an optimal double-gate structure, a thin nanosheet-based channel, and an effective high- κ dielectric namely HfO2. The reliably reported double gate IGZO nanosheet TFTs (DG-IGZO-NS-TFTs) are tested under positive and negative bias stress at variant temperatures, and the resulting modulations are analyzed critically. The reported DG-IGZO-NSTFTs exhibit a negative side threshold voltage shift (Δ Vth) accompanied by an increase in Ion/Ion(0) under negative bias temperature stress (NBTS) at elevated temperatures, which indicates the presence of additional charges. An anomalous negative side shifting of the Vth is observed under positive bias temperature stress (PBTS), where diffused hydrogen atoms are identified as introducing excess n-type carriers into the channel and causing the observed Δ Vth. The spectroscopic analysis is performed to establish evidence for the assumed mechanisms, and the role of individual gates is investigated in the context of performance variance under temperature-bias stress. Moreover, the partial reversibility of the stress-induced degradation is experimentally established and methodically discussed. Overall, the reported results offer a comprehensive understanding of scaled-channel DG-NS-IGZO-TFTs, which help shape performance-enhancement strategies, control degradation mechanisms, and define appropriate application scenarios. © 2013 IEEE.

关键词： Thin film transistors

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An Improved SB-SPS Scheme with Low Transmission Delay for Relay Transmission in Vehicle Platooning with C-V2X Sidelink Communication

An Improved SB-SPS Scheme with Low Transmission Delay for Re...

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IEEE Conference on Vehicular Technology (VTC)

作者： Kohei Murata Kosuke Sanada Hiroyuki Hatano Kazuo Mori Department of Electrical and Electronic Engineering Graduate School of Engineering Mie University Tsu-city Mie Japan

ISBN: (数字)9798350387414

ISBN: (纸本)9798350387421

C-V2X (Cellular-Vehicle to Everything) is a promising communication technology for achieving vehicle platooning. C-V2X standardizes sidelink communication for V2V (Vehicle-to-Vehicle) direct transmission and it employs the SB-SPS (Sensing Based Semi Persistent Scheduling) scheme for its resource management. For the vehicle platooning, periodic information sharing for a lead vehicle is essential among the vehicles within the entire platoon, and relay transmission employing sidelink communication is considered as one of promising sharing means. However, the SB-SPS scheme is originally designed for broadcast communications, and then, for relay transmissions in the platoon, it may cause large transmission delay from the lead vehicle to the tail end one due to forwarding delay at intermediate relay vehicles. This work clarifies the impact of the SB-SPS scheme on the performance for relay transmissions in vehicle platooning with C-V2X sidelink communication, and proposes an improved SB-SPS scheme to reduce the transmission delay. The performance evaluation through computer simulation demonstrates the effectiveness of the proposed scheme.

关键词： Vehicular and wireless technologies Computer simulation Prevention and mitigation Vehicular ad hoc networks Sidelink Tail Delays

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Enhanced SB-SPS Scheme to Mitigate Half Duplex Problem for Relay Transmission in Vehicle Platooning

Enhanced SB-SPS Scheme to Mitigate Half Duplex Problem for R...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Akito Ohshima Kosuke Sanada Hiroyuki Hatano Kazuo Mori Department of Electrical and Electronic Engineering Graduate School of Engineering Mie University Tsu city Mie Japan

In vehicle platooning, relay transmission using sidelink communications, specified by the C-V2X (Cellular Vehicle-to-Everything) standard is considered as a means of information exchange. The autonomous resource management scheme, SB-SPS (Sensing Based Semi Persistent Scheduling), has been standardized for sidelink communications. However, a half duplex problem, one of major problems in the SB-SPS, is not sufficiently resolved for the relay transmission in vehicle platooning. This work proposes an enhanced resource management scheme to mitigate half duplex problem in vehicle platooning employing the SB-SPS scheme. The performance evaluation through computer simulation demonstrates the effectiveness of the proposed scheme.

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ULTRA-RELIABLE URBAN AIR MOBILITY NETWORKS

arXiv

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arXiv 2024年

作者： Kim, Hyunsoo The Graduate School Yonsei University Department of Electrical and Electronic Engineering Korea Republic of

Recently, urban air mobility (UAM) has attracted attention as an emerging technology that will bring innovation to urban transportation and aviation systems. Since the UAM systems pursue fully autonomous flight without a pilot, wireless communication is a key function not only for flight control signals, but also for navigation and safety information. The UAM networks must be configured so that the UAM can receive command and control (C2) messages by securing continuous link stability without any interruptions. Nevertheless, a lot of prior works have focused only on improving the average performance without solving the low-reliability in the cell edges and coverage holes of urban areas. In this dissertation, we identify the factors that hinder the communication link reliability in considering three-dimensional (3D) urban environments and propose an antenna configuration, resource utilization, and transmission strategy to enable UAM to receive C2 messages regardless of time and space. First, through stochastic geometry modeling, we analyze the signal blockage effects caused by the urban buildings. The blockage probability is calculated according to the shape, height, and density of the buildings, and the coverage probability of the received signal is derived by reflecting the blockage events. Furthermore, the low-reliability area is identified by analyzing the coverage performance according to the positions of the UAMs. To overcome the low-reliability region, we propose three methods for UAM network operation: i) optimization of antennas elevation tilting, ii) frequency reuse with multi-layered narrow beam, and iii) assistive transmission by the master UAM. To be specific, the optimal antenna tilting allow the C2 signal to be transmitted evenly to all regions, and the frequency reuse with multi-layered narrow beam is effective in reducing strong line of sight (LOS) interference at high altitudes. Lastly, the proposed master UAM transmission is designed to support UAM

关键词： Stochastic systems

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