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2023 IEEE International Conference on Advanced Power system Automation and Protection, APAP 2023

作者： Jin, Bo-Liang Dong, Xin-Zhou Tsinghua University State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Beijing China

ISBN: (纸本)9798350306668

The fault characteristics of transmission lines connected to inverter-interfaced power sources such as photovoltaic stations and permanent magnetic synchronous generator are fundamentally different from traditional power grids, and traditional protection methods have adaptability issues. The protection on the system side and the inverter side of the transmission line has inconsistent characteristics of sensitivity, reliability, and speed. When the system side protection operates and controls breaker tripping, the distance protection on the station side then can operate reliably in a longer time. In this regard, this article proposes a non-pilot protection scheme that utilizes low sampling rate single ended electrical quantities. For different types of faults, zero sequence current, negative sequence current, and voltage harmonic components are used as acceleration criteria for distance protection, which can reliably accelerate the local distance protection action after the opposite breaker trips. A photovoltaic station transmission system model is built in PSCAD, and the simulation results verify the effectiveness of the proposed scheme. © 2023 IEEE.

关键词： Electric lines

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Ultra Flexible S-band 1x5 Wavelength Selective Switch Based On Off-the-shelf C-band Optics

Ultra Flexible S-band 1x5 Wavelength Selective Switch Based ...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Feng, Zhenhua You, Quan Liu, Minghuan Shi, Hu Chen, Weizhang State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen China WDM System Department of ZTE Corp. Wuhan China WDM System Department of ZTE Corp. Beijing China

An S-band 1x5 WSS prototype covering 1470 to 1520 nm is experimentally demonstrated using off-the-shelf C band optical elements. The main optical performances are measured, showing comparable or even superior performa... 详细信息

ISBN: (纸本)9798350379266

关键词： Optical band gaps

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Impact of human activities on the long-term change and seasonal variability of Ebinur Lake,Northwest China

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Science China Earth Sciences 2025年第2期68卷 473-486页

作者： Haoxin DENG Qiuhong TANG Zhidong ZHANG Xingcai LIU Gang ZHAO Shibo CUI Zhiping ZHANG Shuai SHAO Jianbao LIU Fahu CHEN Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China School of Geography Nanjing Normal UniversityNanjing 210023China Group of Alpine Paleoecology and Human Adaptation(ALPHA) State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Inland lakes in arid Central Asia are particularly susceptible to the impact of climate change and human *** Lake,the largest salt inland lake in Xinjiang,Northwest China,has experienced rapid shrinkage,with human activities identified as the primary influencing ***,it remains unclear how human water use in different sectors,such as irrigation,husbandry,and industry,is responsible for the long-term change and seasonal variability of the lake area under changing *** study aims to address this knowledge gap by developing an integrated hydrological-socioeconomic-lake model that simulates the changes in the Ebinur Lake area during the period of 1950–*** simulated lake area changes under different model experiments were then compared with separate the impacts of climate change and human water use of different *** results indicate that climate change,irrigation,husbandry,and industry water uses have contributed+5%,-79%,-25%,and-1%of the long-term change in the lake area,*** climate change alone increasing the lake area,the increase in human water use has resulted in the persistent decline of Ebinur ***,husbandry water use emerges as a significant contributor to lake shrinkage,accounting for approximately one-third of the impact of ***,irrigation water use has contributed to the enhanced seasonal variability,as indicated by the difference between the maximum and minimum monthly lake area in a *** difference has increased from 120 km2in the 1950s to 183 km2in the 2010s.

关键词： Ebinur Lake Climate change Irrigation Seasonal variability Hydrological-socioeconomic-lake model

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Optimal Energy-Efficient Operation of a Metro Train on a Long and Steep Downhill Segment

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CSEE Journal of Power and Energy systems 2023年第6期9卷 2356-2365页

作者： Deqiang He Hanqing Jian Yanjun Chen Jian Miao Zhixiao Luo Chonghui Ren Lang Zhang the department of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing TechnologySchool of Mechanical EngineeringGuangxi UniversityNanning 530004China the department of Guangxi Police College Nanning 530028China. the department of Nanning Rail Transit Co. Ltd.Nanning 530029China

Because the standard four-stage operation and con-trol strategy cannot fully utilize the gravitational potential energy of a train operating on a long and steep downhill segment,this paper further improves the method for train operation and control *** improved operation includes three stages of acceleration,coasting-speed limit cruising,and *** the speed limit,time limit,and distance limit as the constraints,the coasting condition switching point,braking condition switching point,traction coefficient,and braking force coefficient are used as the decision ***,an improved train traction energy consumption model is constructed,and an improved differential evolution algorithm is designed to solve this *** improved method is used to simulate two long and steep downhill segments of the Nanning *** results show that the improved method can meet the requirements of speed limit,time limit,and distance *** with the standard four-stage operation,the improved train operation and control strategy can reduce train energy consumption by more than 40%on the two long and steep downhill segments;compared with other similar algorithms,the improved algorithm is more suitable for solving the model.

关键词： Energy-efficient operation improved differential evolution algorithm long and steep downhill segment metro train

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Dynamic Contrast Analyzer for Generating Health Indicators in Machinery Monitoring Under Time-varying Speed Conditions

Dynamic Contrast Analyzer for Generating Health Indicators i...

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2024 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2024

作者： Liu, Wenyi Yu, Jianbo Department of Industrial Engineering Tongji University Shanghai China State Key Laboratory of Large Electric Drive System and Equipment Technology Tianshui China

ISBN: (纸本)9798350386097

Machinery health monitoring under time-varying speed conditions is an ongoing challenge, where the significant variations in rotational speed frequently result in false alarms and missed defect detections. In this paper, a simple method, i.e., dynamic contrast analyzer (DC-Analyzer), is proposed to generate health indicators for machinery self-adaptive monitoring. Contrastive learning is used to adjust the representational features of vibration signals with various speeds, which facilitates the self-extraction of manifold trend over speeds. A minor network is proposed to perform feature regression between rotational speeds and vibrational representations for condition alignment. The final health indicators of rotating machinery can be obtained by calculating the feature similarity of real-time vibrational representations and corresponding approximate features from the regressor. The effectiveness of DC- Analyzer is verified on a rolling bearing test rig. The results show that the proposed method outperforms those representative approaches in health indicator generating, which provides more potential for the issue of dynamic and time-varying conditions. © 2024 IEEE.

关键词： Roller bearings

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Methane and nitrous oxide emissions from municipal wastewater treatment plants in China:A plant-level and technology-specific study

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Environmental Science and Ecotechnology 2024年第4期20卷 123-130页

作者： Haiyan Li Liangfang You He Du Bowen Yu Lu Lu Bo Zheng Qiang Zhang Kebin He Nanqi Ren School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen518055China Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration Institute of Environment and EcologyTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

Wastewater treatment is an important source of greenhouse gases(GHGs).Yet large uncertainties remain in the quantification of GHG emissions from municipal wastewater treatment plants(MWWTPs)in China.A high-resolution and technology-specific emission inventory is still lacking to support mitigation strategies of *** we develop a plant-level and technology-based MWWTP emission inventory for China covering 8703 plants and 19 treatment technology categories by compiling and harmonizing the most up-to-date facility-level ***'s methane(CH_(4))and nitrous oxide(N_(2)O)emissions from MWWTPs in 2020 are estimated to be 150.6 Gg and 22.0 Gg,respectively,with the uncertainty range of-30%to 37%and-30%to 26%at 95%confidence *** find an emission inequality across cities,with the richest cities emitting two times more CH_(4)and N_(2)O per capita from municipal wastewater treatment than the poorest *** emitted CH_(4)and N_(2)O are dominated by Anaerobic/Anoxic/Oxic-,Sequencing Batch Reactor-,Oxidation Ditch-,and Anoxic/Oxic-based MWWTPs of less than 20 years *** the relatively young age structure of China's MWWTPs,the committed emissions highlight the importance of reducing on-site GHG emissions by optimization of operating conditions and innovation *** emission differences among our estimates,previous studies,and the Intergovernmental Panel on Climate Change guidelines are largely attributed to the uncertainties in emission factors,implying the urgent need for more plant-integrated measurements to improve the accuracy of emission accounting.

关键词： Methane Nitrous oxide Emissions Municipal wastewater treatment plants

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Pricing Binary Variables of system-wide Constraints for Power system Optimization

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CSEE Journal of Power and Energy systems 2024年第3期10卷 1131-1144页

作者： Jiaxun Li Wei Lin Zhifang Yang Mikhail Davidson State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Faculty of Computational Mathematics and Cybernetics Moscow State UniversityMoscow 119991Russia IEEE

With the trend of multiple energies or flexible demand in power systems,binary variables appear in systemwide constraints,which are the foundation of marginal pricing currently in *** appropriate pricing method incentivizes compliance of market participants;otherwise,compliance can be incentivized by paying discriminatory uplift payments which jeopardize transparency of *** paper proposes two theorems to examine whether the binary variables brought by multiple energies and flexible demand will impact compliance under marginal *** first theorem shows sufficient conditions with which marginal pricing with fixed binary variables incentivizes compliance,while the second theorem shows sufficient conditions to require uplift *** improve transparency by reducing uplift payments under cases which fall into the second theorem,this paper further proposes a pricing method by combining 1)designed constraints to price binary variables in system-wide constraints,and 2)convex hull pricing to price binary variables in private *** of the proposed theorems and pricing method is verified in an electricity-gas case(consisting of the IEEE 30-bus system and the NGS 10-node system)and the IEEE 118-bus test system.

关键词： Binary variables impact analysis pricing under non-convexities

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Optimized Design of a Haptic Unit for Vibrotactile Amplitude Modulation

Optimized Design of a Haptic Unit for Vibrotactile Amplitude...

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2024 IEEE International Conference on robotics and Biomimetics, ROBIO 2024

作者： Huang, Jingchen Fang, Yun Guo, Weichao Qiao, Zhijian Sheng, Xinjun School of Mechanical Engineering Meta Robotics Institute Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai200240 China Hong Kong University of Science and Technology Department of Electronic and Computer Engineering Hong Kong Hong Kong

ISBN: (纸本)9781665481090

Communicating information to users is a crucial aspect of human-machine interaction. Vibrotactile feedback encodes information into spatiotemporal vibrations, enabling users to perceive tactile sensations. It offers advantages such as lightweight, wearability, and high stability, with broad applications in sensory substitution, virtual reality, education, and healthcare. However, existing haptic unit designs lack amplitude modulation capabilities, which limits their applications. This paper proposed an optimized design of the haptic unit from the perspective of vibration amplitude modulation. A modified elastic model was developed to describe the propagation and attenuation mechanisms of vibration in the skin. Based on the model, two types of hierarchical architectural design were proposed. The design incorporated various materials arranged in multiple layers to amplify or attenuate the vibration amplitude as it traveled through the structure. An experimental platform was built to evaluate the performance of the optimized design. © 2024 IEEE.

关键词： Virtual reality

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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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Research on Image Analysis and Correction system of Heliostat Spot Quality

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Applied Solar Energy (English translation of Geliotekhnika) 2024年第1期60卷 66-82页

作者： Kashif Ali Song Jifeng North China Electric Power University Department of New Energy Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

Abstract: Heliostats are integral components of tower solar thermal power generation systems, optimizing heliostat efficiency directly impacts overall power generation effectiveness. This research focuses on evaluating and enhancing heliostat optical quality and tracking accuracy, critical factors influencing their concentration efficiency. The study presents a comprehensive approach based on spot evaluation and correction techniques to assess and boost heliostat performance. Static Optical Quality Assessment, A novel methodology is introduced to appraise heliostat optical quality. It involves capturing heliostat spot shapes through image processing, followed by fitting and comparison with theoretical simulations. This technique provides valuable insights into heliostat mirror quality. Dynamic Tracking Accuracy Evaluation scheme is devised to evaluate dynamic tracking accuracy, by analyzing centroid positions of spots captured at regular intervals, horizontal and vertical tracking deviation angles are computed. These angles gauge heliostat dynamic tracking accuracy. To refine dynamic tracking accuracy, a heliostat tracking error correction scheme is proposed. A dynamic geometric tracking error model is formulated, enabling the derivation of a precise tracking angle calculation formula. A least squares mathematical model is established to solve for unknown tracking errors, facilitating accurate error angle calculation and subsequent correction. The presented static spot quality and dynamic tracking accuracy evaluation methods offer simplicity, precision, and efficiency. These techniques hold practical significance for tower solar thermal power generation systems. The devised tracking error correction scheme demonstrates practical effectiveness, validated through experimental simulations and real-world measurements. Implementation of this scheme substantially enhances concentrating power generation efficiency within tower solar thermal power generation systems. © Alle

关键词： Error correction

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