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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Jiang, Xinyu Xu, Fei Li, Zhen Li, Zixin Shi, Liming Li, Yaohua Key Laboratory of High Density Electromagnetic Power and Systems Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences China University of Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Shandong Province Jinan China

ISBN: (纸本)9781665464543

The disturbance of velocity sensor data may cause serious problems when the motor is running at high velocity. To tackle this issue, a velocity estimation method for high-speed linear induction motors (HS-LIM) is proposed in this paper. Firstly, the state equations of voltage, current, and velocity are established in a synchronous coordinate system to obtain the relationship between the voltage and the velocity. Secondly, the voltages of each stator section are used to synthesize the voltage characteristic waves, which are used to calculate the velocity. Finally, two velocity estimation values are fused into one more precise velocity data based on the Kalman filtering recursion algorithm. The simulation experiment verifies that the voltage characteristic waves can accurately estimate the mover velocity of HS-LIM, and the Kalman fusion velocity gets better precise. © 2024 IEEE.

关键词： Kalman filters

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Research on Topology and Control Strategy of DR-MMC Cascaded Hybrid HVDC Transmission System for Offshore Wind Power

Research on Topology and Control Strategy of DR-MMC Cascaded...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Di, Shimin Xiang, Wang Xu, Yinliang Meng, Peiyu Zhang, Haobo Wen, Jinyu Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350300222

Establishing a new type of power system with new energy as the mainstay, offshore wind power needs to be greatly flourished. Based on the research background of 2 GW offshore wind power grid connection, the DR-MMC hybrid cascade system is firstly proposed in this paper. Based on reactive power requirements, the feasible operating range of MMC under different capacities was solved. Therefore, the system parameters were optimized. Then designed the corresponding start-up, steady-state and reactive power coordination control strategies for the system. Finally, the electromagnetic transient simulation model of DR-MMC cascaded hybrid HVDC transmission system is built in PSCAD/EMTDC, and the simulation verified the feasibility of the proposed system topology and the effectiveness of the control strategy. © 2023 IEEE.

关键词： Topology

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On the chronological understanding of the homogeneous dielectric barrier discharge

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High Voltage 2023年第6期8卷 1132-1150页

作者： Xinpei Lu Zhi Fang Dong Dai Tao Shao Feng Liu Cheng Zhang Dawei Liu Lanlan Nie Chunqi Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina College of Electrical Engineering and Control Science Nanjing Tech TechnologyNanjingChina School of Electric Power South China University of TechnologyGuangzhouChina Institute of Electrical Engineering Chinese Academy of SciencesBeijingChina Frank Reidy Research Center for Bioelectrics Old Dominion UniversityNorfolkVirginiaUSA Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginiaUSA

Dielectric barrier discharges(DBD)are widely utilised non‐equilibrium atmospheric pressure plasmas with a diverse range of applications,such as material processing,surface treatment,light sources,pollution control,and *** the course of several decades,extensive research has been dedicated to the generation of homogeneous DBD(H‐DBD),focussing on understanding the transition from H‐DBD to filamentary DBD and exploring strategies to create and sustain H‐*** paper first discusses the in-fluence of various parameters on DBD,including gas flow,dielectric material,surface conductivity,and mesh ***,a chronological literature review is presented,highlighting the development of H‐DBD and the associated understanding of its un-derlying *** encompasses the generation of H‐DBD in helium,nitrogen,and ***,the paper provides a brief overview of multiple‐current‐pulse(MCP)behaviours in H‐*** objective of this article is to provide a chronological un-derstanding of homogeneous dielectric barrier discharge(DBD).This understanding will aid in the design of new experiments aimed at better comprehending the mechanisms behind H‐DBD generation and ultimately assist in achieving large‐volume H‐DBD in an air environment.

关键词： dielectric barrier pollution

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Overview of machine learning applications in fusion plasma experiments on J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 27-38页

作者： Wei ZHENG Fengming XUE Chengshuo SHEN Yu ZHONG Xinkun AI Zhongyong CHEN Yonghua DING Ming ZHANG Zhoujun YANG Nengchao WANG Zhichao ZHANG Jiaolong DONG Chouyao TANG Yuan PAN International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Institute of Artificial Intelligence Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

Machine learning research and applications in fusion plasma experiments are one of the main subjects on *** 2013,various kinds of traditional machine learning,as well as deep learning methods have been applied to fusion plasma *** applications in the real-time experimental environment have proved the feasibility and effectiveness of the *** disruption prediction,we started by predicting disruptions of limited classes with a short warning time that could not meet the requirements of the mitigation *** years of study,nowadays disruption prediction methods on J-TEXT are able to predict all kinds of disruptions with a high success rate and long enough warning ***,cross-device disruption prediction methods have obtained promising *** analysis of the models are *** diagnostics data processing,efforts have been made to reduce manual work in processing and to increase the robustness of the diagnostic *** based on both traditional machine learning and deep learning have been applied to real-time experimental *** models have been cooperating with the plasma control system and other systems,to make joint decisions to further support the experiments.

关键词： machine learning disruption prediction diagnostics data processing J-TEXT

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Study on Double Feedforward Control Strategy for Three-Level Buck-Boost Bi-Directional Converter Applied in Energy-Storage Inverters 11th

Study on Double Feedforward Control Strategy for Three-Level...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Zhou, Chijun Fang, Yu Chen, Jie Li, Rui Shu, Kaixin Wang, Xuehua College of Information Engineering Yang Zhou University Yang Zhou China College of Electrical Energy and Power Engineering Yang Zhou University Yang Zhou China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819788156

This paper focuses on the three-level Buck-Boost Bi-directional converter (TL Buck-Boost BDC) applied in energy-storage inverters serving as charging or discharging circuit for storage battery. Based on the traditional dual closed-loop control method, a dual feedforward control strategy based on the balanced duty cycle signal at the midpoint of the direct current bus (DC Bus) and the battery voltage duty cycle signal is proposed. The balanced duty cycle signal at the midpoint of the DC Bus is generated by the balanced feedforward generator, and the battery voltage duty cycle signal is generated by the battery voltage feedforward generator. These two duty cycle signals are superimposed with the duty cycle signal generated by the dual closed-loop control to construct the duty cycle signal used to control the switching on or off of the switches in the TL Buck-Boost BDC, thereby achieving stable control of the charging or discharging operation in the energy-storage inverter while ensuring the DC-Bus voltage, Realized DC-Bus midpoint balance and improving the dynamic response speed of the system. The control parameters of the TL Buck-Boost BDC is designed, and the correctness and reliability of the method studied in this paper is verified by experimental results. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Buck converter

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Settings Optimization Method for Zero-Sequence Directional Overcurrent Relays Based on Coordination Time Interval 37th

Settings Optimization Method for Zero-Sequence Directional O...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Gao, Yukun Gao, Yi Chen, Jinfu Shi, Hengchu Kong, Dezhi Chen, Jing You, Hao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Yunnan Power Dispatching and Control Center Kunming650011 China

ISBN: (纸本)9789819914388

Zero-sequence directional overcurrent relays (DOCRs) are generally configured with unified settings in China extra-high voltage (EHV) power grid practice, which will inevitably lead to poor rapidity of the whole protection system while ensuring the selectivity requirement. In this paper, a settings optimization method for the zero-sequence DOCRs based on the coordination time interval (CTI) is proposed. Firstly, the relationship between the CTI and the inverse-time characteristic is analyzed. Then, based on the principle that all the zero-sequence DOCRs are configured with unified settings, the determined settings of each relay are optimized according to the sequence of the CTI from small to large. The proposed method is applied to a 500 kV regional power grid, and the result shows that the method can improve the rapidity of the whole protection system and simplify the zero-sequence DOCR coordination process simultaneously. © 2023, State Grid Electric Power.

关键词： Relay protection

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A Novel High Torque Density Spoke-Array Permanent Magnets Vernier Machine with Magnets Bridge

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IEEE Transactions on Industry Applications 2025年

作者： Zhang, Yuwei Zhao, Yu Li, Dawei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

In recent years, permanent magnet vernier machine (PMVM) has drawn more attention due to their high torque density. To further improve torque capability, Spoke-array (SA) PM having better flux focusing effect are applied. However, SAPMVM suffers from a considerable torque reduction due to the deteriorated low order working flux harmonics caused by flux barrier effect. Especially, the higher pole ratio (PR), i.e., the ratio of PM pole-pair to armature pole-pair, the severer torque drop of SAPMVM. In this paper, a novel SAPMVM is proposed, where the magnets bridge is introduced, which can effectively restrict the flux barrier effect. As a result, both the working flux harmonics and torque density of SAPMVM are enhanced. To analyze the operating principle of proposed SAPMVM with magnets bridge, an equivalent magnet circuit model is established. Moreover, the electromagnetic performances of the proposed SAPMVM are compared with regular SAPMVM by FEA, where the torque of proposed SAPMVM has increased by 43.3% and 175.6% under rated-load when the PR is selected as 5 and 11. © 1972-2012 IEEE.

关键词： Permanent magnets

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Capacitance loss characteristics of metallized film capacitors under atmospheric corrosion

Capacitance loss characteristics of metallized film capacito...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Qiu, Tian Li, Hua Li, Zheng Lin, Fuchang Zhang, Qin Li, Liuxia Wang, Yan School of Electrical and Electronic Engineering Huazhong University of Science & Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

As the key components, metallized film capacitors (MFCs) are widely used in power system. Working at high temperature and humidity conditions, oxygen and moisture in atmosphere will permeate into MFCs and initiate electrode corrosion, which contributes to capacitance loss, and thus the reliability is reduced. In this work, a capacitance loss model for atmospheric corrosion is proposed to study the aging pattern of MFCs. Accordingly, an accelerated aging test with different temperature-humidity combinations is carried out to investigate the corrosion behavior at various temperature and humidity conditions. The results indicate the corrosion sites tend to distribute around the fibers on polymer films. The capacitance loss rate declines along time because of formation of oxide layers. It is also found temperature has a predominant effect on corrosion process in contrast of humidity. © 2022 IEEE.

关键词： Capacitance

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A Simulation Platform for Assessing the Status of the Vibration Sensor Hanging the Grid 17th

A Simulation Platform for Assessing the Status of the Vibrat...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Lei, Yaowu Liu, Jing Hu, Haoliang Chen, Dezhi Zhou, Feng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9789819904501

Vibration will lead to power grid disconnection, equipment rupture and other problems, so the working status of the vibration sensor hanging the grid is closely related to the normal operation of the power grid. But there are few researches on the status evaluation of the vibration sensor. On this basis, this paper selects spring-mass-damping system to simulate the sensor, and the classical mechanics is used to deduce the differential equation of the sensor under the system. By the equation, the corresponding transfer function can be established and replaces the sensor to simulate the actual sensor’s work in Simulink, which can provide the sensor work data used for algorithm validation. In addition, the platform simulation interactive interface with the Simulink is established by the APP Designer. In the test section, wavelet is selected for the pre-analysis, and the test is further completed by the BP neural network and Support Vector Regres sion. The simulation platform built can simulate the common status faults of the vibration sensor, and evaluate the status in the platform to test the effectiveness of the status evaluation algorithm. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Simulation platform

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Minimum Current Optimization of DBSRC Considering Dead-time Effect

Minimum Current Optimization of DBSRC Considering Dead-time ...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Yang, Jiawen Zhang, Yu Wu, Xinmi Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

In the dual-bridge series resonant converter (DBSRC) working at a high switching frequency, the dead-time effect becomes a serious issue. When the minimum current trajectory (MCT) method is applied, the inductor current cannot be minimized due to the dead-time effect, and the range of the soft switching is reduced. Considering the dead-time, this paper firstly performs a theoretical analysis of the transmission power and soft-switching characteristics based on the fundamental harmonic approximation (FHA) approach. Then, a minimum current trajectory method considering dead-time (MCT-d) is proposed to achieve minimum inductor current by compensating the dead-time. Meanwhile, the method can extend the soft-switching range as well. Finally, the experimental results validate the theoretical analysis and the improvement of the converter efficiency. © 2022 IEEE.

关键词： Zero voltage switching

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