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Effect of tin oxide coating on physical properties of silver nanowire transparent conductive electrodes

Applied Physics A: Materials Science and Processing 2025年第6期131卷

作者： Nguyen, Thi Hong Nhung Luu, Ba Hoang Anh Pham, Sy Hieu Nguyen, Thi Thu Hien Tran, Quoc Hoan Pham, Anh Tuan Nguyen, Thi Lan Nguyen, Duy Cuong School of Materials Science and Engineering Hanoi University of Science and Technology No. 1 Dai Co Viet Str. Hai Ba Trung Hanoi Viet Nam Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Viet Nam Faculty of Power System Electric Power University 235 Hoang Quoc Viet Str Hanoi Viet Nam Faculty of Control and Automation Electric Power University 235 Hoang Quoc Viet Str Hanoi Viet Nam

Thin SnO2 layers were coated on the surface of silver nanowire transparent conductive electrodes (AgNW TCEs) by atmospheric pressure atomic layer deposition. After coating, the AgNWs have been fully covered on their surface with a layer of SnO2, and they are connected to the surface of the substrate. The sheet resistance sharply decreased from 170.86 Ω/ to 20.09 Ω/, while the transmittance reduced from 93.08 to 71.67%. The Joule-heating temperature of the transparent electrode increased from 117 °C to 251 °C. The best AgNW TCE was observed at 100 cycle SnO2 coating with a sheet resistance of 20.09 Ω/, transmittance of 88.91%, and figure of merit of 155.03. The adhesion of silver nanowires to the substrate significantly increased after coating SnO2. Results indicate that the SnO2 coating on the surface of AgNWs by atomic layer deposition is a highly attractive approach for improving the performance of AgNW TCEs. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Silver nanowires

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The Design and Field Test of a Shunt Unified power Quality controller for Mitigating Voltage Sags

The Design and Field Test of a Shunt Unified Power Quality C...

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IEEE Student Conference on Electric Machines and systems

作者： Chang Liu Lin Xu Wei Wei Yingdong Wei Hua Yang Xueyuan Liu Yi Zhang Ying Wang Electric Power Research Institute of State Grid Sichuan Electric Power Company Chengdu China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China School of Electrical Engineering and Automation Fuzhou University Fuzhou China College of Electrical Engineering Sichuan University Chengdu China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

A shunt unified power quality controller (S-UPQC) is developed and has been tested in the field in order to confirm its performance at mitigating voltage sags for sensitive power consumers. The S-UPQC keeps the magnitude of the voltage supply for power consumers constant by acting as a voltage source when voltage sags occur in the power grid. In this paper, a smooth switching strategy is designed to smooth the voltage disturbance of power consumers when the power supply switches between the S-UPQC and the grid. Simulation results are presented to show its high performance. A prototype of S-UPQC is developed and a field test has been conducted. During its operation, the performance of the SUPQC at mitigating voltage sags within actual power systems is confirmed.

关键词： Simulation power quality Prototypes Switches Production Reliability Switching circuits

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Carbon Monitor-power: near-real-time monitoring of global power generation on hourly to daily scales

arXiv

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arXiv 2022年

作者： Zhu, Biqing Song, Xuanren Deng, Zhu Zhao, Wenli Huo, Da Sun, Taochun Ke, Piyu Cui, Duo Lu, Chenxi Zhong, Haiwang Hong, Chaopeng Qiu, Jian Davis, Steven J. Gentine, Pierre Ciais, Philippe Liu, Zhu Department of Earth System Science Tsinghua University Beijing100084 China Laboratoire des Sciences du Climate et de l'Environnement LSCE Orme de Merisiers Gifsur-Yvette91191 France Product and Solution & Website Business Unit Alibaba Cloud Zhejiang Hangzhou311121 China Department of Earth and Environmental Engineering Columbia University New YorkNY United States Department of Civil & Mineral Engineering University of Toronto TorontoONM5S 1A1 Canada Department of Electrical Engineering The State Key Lab of Control and Simulation of Power Systems and Generation Equipment Institute for National Governance and Global Governance Tsinghua University Beijing China Institute of Environment and Ecology Shenzhen International Graduate School Tsinghua University Shenzhen China Department of Earth System Science University of California Irvine 3232 Croul Hall IrvineCA92697-3100 United States

We constructed a frequently updated, near-real-time global power generation dataset: Carbon Monitor-power since January, 2016 at national levels with near-global coverage and hourly-to-daily time resolution. The data presented here are collected from 37 countries across all continents for eight source groups, including three types of fossil sources (coal, gas, and oil), nuclear energy and four groups of renewable energy sources (solar energy, wind energy, hydro energy and other renewables including biomass, geothermal, etc.). The global near-real-time power dataset shows the dynamics of the global power system, including its hourly, daily, weekly and seasonal patterns as influenced by daily periodical activities, weekends, seasonal cycles, regular and irregular events (i.e., holidays) and extreme events (i.e., the COVID-19 pandemic). The Carbon Monitor-power dataset reveals that the COVID-19 pandemic caused strong disruptions in some countries (i.e., China and India), leading to a temporary or long-lasting shift to low carbon intensity, while it had only little impact in some other countries (i.e., Australia). This dataset offers a large range of opportunities for power-related scientific research and policy-making. © 2022, CC BY.

关键词： Carbon

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An active fault-tolerant control strategy of aircraft engines based on multi-model predictive control

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International Journal of Turbo and Jet Engines 2020年第0期

作者： Du, Xian Ma, Yan-Hua School of Control Science and Engineering Dalian University of Technology Dalian China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing China School of Microelectronics Dalian University of Technology Dalian China DUT Artificial Intelligence Institute Dalian China

In order to mitigate or even eliminate the adverse effects caused by typical components faults of aircraft engines, an active fault-tolerant strategy based on multi-model predictive control is proposed, which consists of a pre-established multi-model library, a judgement module, and corresponding predictive controllers with smooth transition switching logic. Multiple dynamic nonlinear or linear models are firstly established by means of system identification methods, based on the component-level nonlinear engine model or historical data in faults cases. The judgement module is utilized to online compare the engine measured outputs with that of all models in the pattern library and select the best matched dynamic model on the basis of outputs error quadratic performance index, thus determining the most appropriate predictive controller for the next control sample period. When a certain fault occurs, the fault model in the library could be identified and fault-model based predictive controller is activated. Finally, two kinds of pre-considered high-pressure compressor and high-pressure turbine component-level faults are taken as an example to design the active fault-tolerant controller. Simulation results show that the judgement module owns the ability to sense the fault and gives smooth switching signal to the suitable predictive controller, verifying the effectiveness of the proposed technique. © 2020 Walter de Gruyter GmbH, Berlin/Boston 2020.

关键词： Model predictive control

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Hohmann transfer via constrained optimization

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Frontiers of Information Technology & Electronic engineering 2018年第11期19卷 1444-1458页

作者： Li XIE Yi-qun ZHANG Jun-yan XU State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power UniversityBeijing 102206China Beijing Institute of Electronic Systems Engineering Beijing 100854China

Inspired by the geometric method proposed by Jean-Pierre MAREC, we first consider the Hohmann transfer problem between two coplanar circular orbits as a static nonlinear programming problem with an inequality constraint. By the Kuhn-Tucker theorem and a second-order sufficient condition for minima, we analytically prove the global minimum of the Hohmann transfer. Two sets of feasible solutions are found: one corresponding to the Hohmann transfer is the global minimum and the other is a local minimum. We next formulate the Hohmann transfer problem as boundary value problems, which are solved by the calculus of variations. The two sets of feasible solutions are also found by numerical examples. Via static and dynamic constrained optimizations, the solution to the Hohmann transfer problem is re-discovered, and its global minimum is analytically verified using nonlinear programming.

关键词： Hohmann transfer Nonlinear programming Constrained optimization Calculus of variations

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Mechanism of electron power absorption in radio frequency plasmas with inverse sheaths

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Plasma Sources Science and Technology 2025年第6期34卷 065005-065005页

作者： Zhenhua Zhou Dong Yang Bocong Zheng Yangyang Fu Department of Engineering Physics Tsinghua University Beijing 100084 People’s Republic of China Department of Electrical Engineering Tsinghua University Beijing 100084 People’s Republic of China School of Physics Beijing Institute of Technology Beijing 100081 People’s Republic of China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing 100084 People’s Republic of China Sichuan Energy Internet Research Institute Tsinghua University Sichuan 610213 People’s Republic of China

This study reports mechanisms of electron power absorption in radio frequency (RF) plasmas with inverse (negatively charged) sheaths, which are caused by strong thermionic electron emission from the electrode surface. Based on particle-in-cell/Monte-Carlo collision simulations and the moment analysis of the Boltzmann equation, we confirm that this thermionic-emission-driven RF plasma features more intense electron heating in the bulk plasma, which differs from capacitive RF discharges. We reveal that non-local collisional heating can still be the dominant electron power absorption mechanism even when the strong electric field penetrates across the gap in an RF discharge. Furthermore, a transition of the dominant heating mode from non-local collisional to Ohmic is demonstrated as the gas pressure increases in RF plasmas with inverse sheaths.

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Redesigning electrification of China’s ammonia and methanol industry to balance decarbonization with power system security

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Nature Energy 2025年 1-12页

作者： Jiarong Li Jin Lin Sirui Wu Zhipeng Yu Chris P. Nielsen Michael B. McElroy Jianxiao Wang Jie Song Xi Lu Yonghua Song Xuefeng Lyu Mingkai Yu Department of Electrical Engineering Tsinghua University Beijing China Harvard-China Project on Energy Economy and Environment Harvard University Cambridge MA USA State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing China Department of Industrial Engineering and Management College of Engineering Peking University Beijing China State Key Laboratory of Regional Environment and Sustainability School of Environment Tsinghua University Beijing China Institute for Carbon Neutrality Tsinghua University Beijing China State Key Laboratory of Internet of Things for Smart City University of Macau Macau China School of Nuclear Science and Engineering North China Electric Power University Beijing China China Electric Power Research Institute Beijing China

Electrification represents a critical pathway to decarbonize the ammonia and methanol industries by reducing fossil fuel reliance. However, a greater understanding is needed of how the spatio-temporal mismatch between renewable generation and chemical load patterns may impact on power system emissions and security. Here we assess different electrification pathways across 22 Chinese provinces from 2020 to 2050. Using 2020 data, we show that reliance on grid electricity offsets CO2reductions by increasing power system emissions, raising national emissions by 1%. Integrating co-located renewables without self-balancing flexibility exacerbates power system security risks, potentially increasing balancing requirements by 9%. To address this challenge, we propose the ‘Green Flexible Chemical Electrification’ pathway, transitioning from requirements for stringent co-located renewables to rigid temporal self flexibility. By 2030, Green Flexible Chemical Electrification demonstrates cost competitiveness nationwide, with green ammonia potentially generating 2 billion RMB in profit. Additionally, redesigning electricity pricing to incentivize chemical-side demand management further enhances power–chemical synergies.

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Online Magnetization Surface Identification for a Switched Reluctance Motor

Online Magnetization Surface Identification for a Switched R...

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International Universities power engineering Conference (UPEC)

作者： Alecksey Anuchin Andrei Bogdanov Galina Demidova Evgeniy Stolyarov Dimid Surnin Yuriy Vagapov Department of Electric Drives Moscow Power Engineering Institute Moscow Russia Faculty of Control System and Robotics ITMO University Saint-Petersburg Russia Faculty of Art Science and Technology Wrexham Glyndwr University Wrexham UK

ISBN: (数字)9781728110783

ISBN: (纸本)9781728110790

The precise control of switched reluctance motor requires information about the magnetization surface as a function of rotor angular position and current. The surface can be obtained performing offline tests; however, it demands specialized mechanical equipment and time for commissioning. Moreover, the magnetization surface may be changed with the varying of the rotor and stator temperatures, which affect their dimensions and, therefore, the airgap variation. That is why the online estimation of the magnetization surface is desirable. This paper proposes the identification method operating in parallel with the model predictive current control system utilizing the magnetization map. Any error between the referenced and obtained currents is used to correct the reference points of the two-dimensional array representing the magnetization surface. The proposed method was examined using a simulation model and operated online in parallel with the primary control system driving the electrical machine.

关键词： Magnetization Reluctance motors Rotors Pulse width modulation Couplings Torque

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Active fault tolerant control of turbofan engines with actuator faults under disturbances

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International Journal of Turbo and Jet Engines 2020年第0期 21-32页

作者： Ma, Yan-Hua Du, Xian Gou, Lin-Feng Wen, Si-Xin School of Microelectronics Dalian University of Technology Dalian China School of Control Science and Engineering Dalian University of Technology Dalian China School of Power and Energy Northwestern Polytechnical University Xi'an China Dut Artificial Intelligence Institute Dalian China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing China

In this paper, an active fault-tolerant control (FTC) scheme for turbofan engines subject to simultaneous multiplicative and additive actuator faults under disturbances is proposed. First, a state error feedback controller is designed based on interval observer as the nominal controller in order to achieve the model reference rotary speed tracking control for the fault-free turbofan engine under disturbances. Subsequently, a virtual actuator based reconfiguration block is developed aiming at preserving the consistent performance in spite of the occurrence of the simultaneous multiplicative and additive actuator faults. Moreover, to improve the performance of the FTC system, the interval observer is slightly modified without reconstruction of the state error feedback controller. And a theoretical sufficiency criterion is provided to ensure the stability of the proposed active FTC system. Simulation results on a turbofan engine indicate that the proposed active FCT scheme is effective despite of the existence of actuator faults and disturbances. © 2020 Walter de Gruyter GmbH, Berlin/Boston 2020.

关键词： Turbofan engines

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Investigate the influence of renewable energy penetration on the electricity market equilibrium 8

Investigate the influence of renewable energy penetration on...

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8th Renewable power Generation Conference, RPG 2019

作者： Li, Chenchen Yang, Zhifang Zhang, Yichi Yu, Juan Zou, Peng State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing China CQU-UC Joint co-op Institute Chongqing University Chongqing China Power Dispatch and Control Center Shanxi Electric Power Company of SGCC Shanxi China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

China is performing the electricity market reform. With the increasing penetration of renewable energy, it is important to understand how the renewables influence the market performance. Renewables are different from the traditional generators in two aspects: 1) the marginal costs of renewable are small;2) renewables cause fluctuations and increase the requirement of auxiliary service. In this paper, we analyse the influence of renewables on the market equilibrium. A multi-period Supply Function Equilibrium (SFE) model is formulated, where the upper level model maximizes individual profits of market participants, and the lower level model minimizes the market operational costs. To avoid the infeasibility of the equilibrium model, the relaxation of the complementary slackness condition is utilized. This paper exhibits how the increase of renewable penetrations affects the optimal bidding and profits of other market participants, including the traditional generators, hydro generator, and storage. The influence of renewables on the market equilibrium is exhibited as well. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Profitability

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