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On Security-Constrained Bidding of Shared Transportation Hubs for Renewable Fuels and Refined Oil Participating Within Energy, Regulation and Pipeline Logistics Markets

On Security-Constrained Bidding of Shared Transportation Hub...

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IEEE Student Conference on Electric Machines and Systems

作者： Shengshi Wang Hongyi Li Danji Huang Kun Li Shichang Cui Xiaomeng Ai Jiakun Fang Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Engineering Cardiff University Cardiff UK Department of Electrical and Computer Engineering Iowa State University Ames United States Department of Electrical and Computer Engineering University of Macau Macau China PetroChina ShenZhen New Energy Research Institute Co. Ltd. Shenzhen China

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

This paper investigates the security-constrained bidding strategy of the emerging shared transportation hubs for renewable fuels and refined oil (STH-RRs) participating within energy, regulation and pipeline logistics markets. Firstly, to excavate more flexible capability for the power system as well as to increase the revenue of the STH-RR operation company, the model for STH-RR participating in regulation market is established. Secondly, the security-constrained two-stage bidding model is first proposed for STH-RRs to balance the revenue across energy, regulation and pipeline logistics markets. Particularly, to guarantee secure operation of STH-RRs and meet the delivery demand, the rigorous multi-product transportation constraints are considered in both stages. Case studies based on the modified real-world multi-product pipelines in South China validate the proposed method, with the revenue and turnover increase of 14% and 4.7%, respectively, compared with conventional methods.

关键词： Renewable energy sources Uncertainty Oils Pipelines Transportation Regulation Fuels Frequency control Logistics Testing

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Real-Time Estimation of Time-Varying Inertia for Non-Synchronous Devices

SSRN

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SSRN 2023年

作者： Li, Yulong Yao, Wei Zhao, Yifan Huang, Wei Zhai, Suwei Li, Wenyun Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan430074 China Kunming Power Supply Bureau Yunnan Power Grid Company Limited Kunming650012 China Yunnan Power Grid Company Limited Kunming650011 China

With the increasing integration of renewable and non-synchronous resources, the declining level of inertia poses a threat to the stability of power systems. This paper delves into the mechanism of time-varying inertia within mainstream non-synchronous devices and proposes a real-time estimation technique to estimate the constant and time-varying inertia associated with them. By applying the numerical integration method, this technique utilizes observations and their integrals over a continuous timeframe to formulate a system of equations, enabling the estimation of inertia at any given moment. Based on the linear operator analysis, the relationship between the aforementioned system of equations and linear operators is investigated to downscale the original high-dimensional system and extract the inertia. A significant addition is the introduction of the streaming dynamic mode decomposition (sDMD) algorithm, which updates linear operators based on snapshots composed of observations. Its update merely necessitates a small snapshot length, resulting in efficient data storage utilization and space conservation. Case studies on mainstream non-synchronous devices under various controls demonstrate its effectiveness and accuracy for real-time estimation of time-varying inertia. The remarkable advantage of this technique over the existing state-of-the-art method lies in its ability to operate without setting any hyperparameters. © 2023, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

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Numerical simulation of disruption mitigation by applying non-resonant magnetic perturbation and massive gas injection on J-TEXT

Numerical simulation of disruption mitigation by applying no...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zhen Li Zhonghe Jiang Fan Gu Zixiao Jiao Jianjun Yuan Keze Li Jinyu Xiong International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477338

A lot of experimental and theoretical researches have been carrying out to examine the disruption mechanism and the methods to mitigate disruption, including massive gas injection (MGI) and shattered pellet injection (SPI). Based on NIMROD (non-Ideal Magnetohydrodynamics with Rotation, Open Discussion), numerical simulations of the synergistic effect between non-resonant magnetic perturbations and massive gas injection on disruption mitigation is carrying out in J-TEXT. In this paper, we investigate thermal quench, current quench time and the growth of $\mathrm{n}=1-3$ component MHD instabilities responsed to different amplitudes of non-RMPs. The results indicates that non-RMPs can prolong thermal quench and current quench durations and create stronger perturbations during disruption, leading to a high loss of runaway electrons seeds and reducing the hazard of disruption.

关键词： Electrical engineering Magnetohydrodynamics Perturbation methods Thermal quenching Impurities Numerical simulation Hazards

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Implementation and Preliminary Analysis of single/dual-SPI based on NIMROD

Implementation and Preliminary Analysis of single/dual-SPI b...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zixiao Jiao Zhonghe Jiang Zhen Li Keze Li Jianjun Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477338

Compared with massive gas injection(MGI), shattered pellet injection(SPI), as a method which is likely to apply on ITER, has advantages in deep injection and faster penetration speed. This paper introduces the NIMROD(non-Ideal MHD with Rotation, Open Discussion) code coupled with SPI module to carry out numerical simulations. Based on the SPI experiments on the J-TEXT, a set of SPI parameters are selected and scanned, including impurity amount, shattered degree and plume speed. From the results, simulations are in good agreements with experiments. Besides, the paper also achieve dual-SPI simulations which has mainly analyzed magnetic stochasticity and radiation. Though simulation results show dual-SPI may not evoke a higher MHD instabilities, it will bring different modes increasing situations. Dual-SPI will produce more radiation, advance thermal quench(TQ) and heighten current quench(CQ) rate. What's more, dual-SPI can improve radiation asymmetry apparently.

关键词： Analytical models Magnetohydrodynamics Codes Simulation Impurities Thermal quenching Numerical simulation

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Ranging backup protection scheme adapted to photovoltaic inverter control strategy in grid-connected scenarios

Ranging backup protection scheme adapted to photovoltaic inv...

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Energy, Power and Grid (ICEPG), International Conference on

作者： Jin Zhang Yingying Wang Xiangwen Chen Zhao Li Wenhao Wu Xiangning Lin Central China Branch of State Grid Corporation of China Wuhan Hubei Province China Lamor Innovation Studio of Liu Huanzhang Wuhan Hubei Province China College of Electrical Engineering and New Energy China Three Gorges University Yichang Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350377798

ISBN: (纸本)9798350377804

Large-scale photovoltaic grid connection will bring serious challenges to the adaptability of traditional relay protection, and distance protection is the first to bear the brunt due to its weak feeding effect. In this regard, this paper made the following improvements to the traditional distance protection scheme. For the protection of the large grid side, based on the negative and zero sequence networks under faults, a short-circuit impedance algorithm independent of the transition resistance size was constructed to solve the fault distance by using the sequence current conditions constructed by the negative sequence current suppression strategy of the photovoltaic field station side and the zero sequence current branching coefficients which were not affected by the control strategy of the photovoltaic inverter. When the protection on the grid side recognizes that the fault occurred in the zone and tripped the breakers, the feeding effect on the fault point disappeared and the virtual synchronizer control strategy was used on the photovoltaic field station side to ensure safe and stable operation during the fault. The protection can thus solve the short-circuit impedance triangle formed by the impedance relay, and then realize the calculation of the short-circuit impedance. The simulation results based on PSCAD/EMTDC show that the proposed scheme eliminates the effect of transition resistance, has high-ranging accuracy, can protect the full length of the line, can act as backup protection in scenarios where the pilot protection is not applicable due to communication failure, and has the role of fault ranging.

关键词： Resistance Photovoltaic systems Grounding Simulation Protective relaying Distance measurement Inverters Impedance Synchronization Protection

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Adaptive actuation of magnetic soft robots using deep reinforcement learning

arXiv

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arXiv 2022年

作者： Yao, Jianpeng Cao, Quanliang Ju, Yuwei Sun, Yuxuan Liu, Ruiqi Han, Xiaotao Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Magnetic soft robots have attracted growing interest due to their unique advantages in terms of untethered actuation and excellent controllability. However, finding the required magnetization patterns or magnetic fields to achieve the desired functions of these robots is quite challenging in many cases. No unified framework for design has been proposed yet, and existing methods mainly rely on manual heuristics, which are hard to satisfy the high complexity level of the desired robotic motion. Here, we develop an intelligent method to solve the related inverse-design problems, implemented by introducing a novel simulation platform for magnetic soft robots based on Cosserat rod models and a deep reinforcement learning framework based on TD3. We demonstrate that magnetic soft robots with different magnetization patterns can learn to move without human guidance in simulations, and effective magnetic fields can be autonomously generated that can then be applied directly to real magnetic soft robots in an open-loop way. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnetic fields

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Automated cardiac vortex ring identification and characterization based on Recurrent All-Pairs Field Transforms and Lagrangian Averaged Vorticity Deviation

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Computers in Biology and Medicine 2024年 179卷 108836-108836页

作者： Yang, Ke Zeng, Shan Ghista, Dhanjoo N. Hu, Xin Lv, Site Wong, Kelvin K.L. School of Mathematics and Computer Science Wuhan Polytechnic University Wuhan430023 China University 2020 Foundation San JoseCA95126 United States The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronic Engineering University of Adelaide AdelaideSA5005 Australia Department of Mechanical Engineering College of Engineering University of Saskatchewan SaskatoonSKS7N 5A9 Canada

Automated identification of cardiac vortices is a formidable task due to the complex nature of blood flow within the heart chambers. This study proposes a novel approach that algorithmically characterizes the identification criteria of these cardiac vortices based on Lagrangian Averaged Vorticity Deviation (LAVD). For this purpose, the Recurrent All-Pairs Field Transforms (RAFT) is employed to assess the optical flow over the Phase Contrast Magnetic Resonance Imaging (PC-MRI), and to construct a continuous blood flow velocity field and reduce errors that arise from the integral process of LAVD. Additionally, Generalized Hough Transform (GHT) is applied for automated depiction of the structure of cardiac vortices. The effectiveness of this method is demonstrated and validated by the computation of the acquired cardiac flow data. The results of this comprehensive visual and analytical study show that the evolution of cardiac vortices can be effectively described and displayed, and the RAFT framework for optical flow can synthesize the in-between PC-MRIs with high accuracy. This allows cardiologists to acquire a deeper understanding of intracardiac hemodynamics and its impact on cardiac functional performance. © 2024 Elsevier Ltd

关键词： Vortex flow

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The Accelerated Life Test Investigation and Lifetime Prediction Method for LED Driver

The Accelerated Life Test Investigation and Lifetime Predict...

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IEEE International Conference on Power and Energy Applications (ICPEA)

作者： Chen Gong Haiping Xu Zengquan Yuan Jinhua Liang Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China

ISBN: (纸本)9781665487627

Reliability evaluation for products with long lifetime and high reliability is a great challenge in reliability engineering. LED luminaires are one of the most popular lighting solutions of the current society due to their long-lasting and energy-efficient. The system reliability of the LED luminaire is determined by the performance of the driver electronics. This paper analyzes the LED driver failure forms and the possible causes, in order to study the failure mechanism of LED driver and predict the lifetime. The accelerated life model of the driver is also established and the method to get the parameters in the model has been discussed. A high accelerated life testing platform has been built to test the sample's lifetime and get the parameters in the accelerated life model. The lifetime of sample is estimated by the model quickly and correctly.

关键词： Analytical models Life testing Lighting Failure analysis Life estimation Prediction methods Light emitting diodes

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Healing of the edge magnetic island in the island divertor configuration on J-TEXT

arXiv

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arXiv 2025年

作者： Hou, Zhangrong Zhou, Song Wang, Nengchao Ding, Yonghua Jiang, Zhonghe Liang, Yunfeng Ren, Zhengkang Mao, Feiyue Yang, Qinghu Wang, Jiaming Xu, Xin Yang, Yutong Hua, Jiankun Xuan, Zijian Zhao, Chuanxu Li, Yangbo Yu, Lei Xia, Donghui Chen, Zhipeng Yang, Zhoujun State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung—Plasmaphysik Jülich52425 Germany Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the island divertor configuration on the J-TEXT tokamak. Experimental results reveal that the size of the edge open magnetic island with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as island healing, occurs when ECRH with a power of 500~600 kW is deposited in the plasma core or when 250 kW of ECRH is deposited at r"# = 0.5 a, where a is the minor radius. The reduction of the island width makes the island divertor ineffective and transition into the limiter configuration. A model incorporating the influence of ECRH on the scrape-off layer (SOL) thermoelectric current is proposed to explain the observed changes in the edge magnetic topology of the island divertor configuration. These findings suggest that ECRH should be deposited at the plasma core with carefully controlled power to ensure the stable and compatible operation of ECRH and the island divertor configuration in tokamaks. The results can provide insights into achieving robust operation of an island divertor in tokamaks. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

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Message from Editors

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CES Transactions on Electrical Machines and Systems 2021年第4期5卷 271-272页

作者： Ronghai Qu Shoudao Huang Jianxin Shen Fengge Zhang Xiuhe Wang Metin Aydin Xiaoyong Zhu Yongxiang Xu Zhuoran Zhang Gaolin Wang Pinjia Zhang Hong Li Dawei Li academic degrees committee State and Province Joint Engineering Research Center of Novel Electrical Machines Center for Advanced Electrical Machines and Drives(CAEMD) State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hunan University China Zhejiang University China Shenyang University of Technology China Shandong University China Kocaeli University Turkey Jiangsu University China Harbin Institute of Technology China Nanjing University of Aeronautics and Astronautics China Tsinghua University China Huazhong University of Science and Technology China

IN recent years,4th Industrial Revolution and Industry 4.0 have swept the world and deeply influenced the development of global industry *** movement arises wide attention to electric motor drive system which is playing an increasing important role in energy consumption transformation and environment *** this tremendous change in industry field,the concept of high-efficient,energy-saving and intelligent motor system has been *** one hand,motor system with advantages such as low vibration,low noise,weak magnetic interference,renewable utilization capacity,high-efficiency and high-reliability could promote the progress of major industries such as mining,renewable energy and cutting-edged equipment *** the other hand,the realization of intelligent and automated operations of motor drive system would help boosting the automation of industrial production.

关键词： operations realization boosting

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