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2022 IEEE International Conference on Power Systems technology, POWERCON 2022

作者： Ma, Rui Zhan, Meng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665417754

ISBN: (纸本)9781665417754

Transient stability accidents induced by converter-based resources have been emerging frequently around the world. In this paper, the transient stability of the grid-tied voltage source converter (VSC) system is studied through estimating the basin of attraction (BOA) based on the hyperplane or hypersurface method. Meanwhile, fault critical clearing times are estimated, based on the approximated BOA and numerical fault trajectory. Further, the dynamic security region (DSR), an important index in traditional power systems, is extended to power-electronics-dominated power systems in this paper. The DSR of VSC is defined in the space composed of active current references. Based on the estimated BOA, the single-VSC-infinite-bus system is taken as an example and its DSR is evaluated. Finally, all these analytical results are well verified by several numerical simulations in MATLAB/Simulink. © 2022 IEEE.

关键词： Power electronics

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Multiphysics Modeling and Parameter Analysis of Industrial Power-to-Hydrogen Electrolyzers 6

Multiphysics Modeling and Parameter Analysis of Industrial P...

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6th International Conference on Energy, Electrical and Power engineering, CEEPE 2023

作者： Chen, Ke Hu, Kewei Yang, Jie Chen, Feng Zhong, Zhiyao Fang, Jiakun State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350348279

This paper proposes the multiphysics model of the industrial power-to-hydrogen electrolyzers. Based on the multi-energy flow in the industrial power-to-hydrogen electrolysis plant, the coupling among the multiphysics in the electrolyzer, including the electrochemical reaction, the flow field, the mass transfer and the temperature field, are unveiled. The governing equations and coupling mechanisms of the physical fields are introduced in detail, which are further illustrated according to the simulation results in COMSOL Multiphysics. Furthermore, several critical parameters, including the cell voltage, temperature and the concentration of the electrolyte, are analyzed based on the proposed model. Through the analysis on the current density- voltage characteristics, it can be concluded that the operating of the industrial electrolyzer usually faces the trade-off between the hydrogen production rate and the efficiency. The proposed model provides multiphysics explanations on the industrial statistics of the electrolyzer. © 2023 IEEE.

关键词： Multiphysics

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Temporal electric field of a helium plasma jet by electric field induced second harmonic(E-FISH)method

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Plasma Science and technology 2023年第1期25卷 43-52页

作者：李旭晋绍珲宋珂聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Center of Stomatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China School of Stomatology Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030People's Republic of China

Electric field is an important parameter of plasma,which is related to electron temperature,electron density,excited species density,and so *** this work,the electric field of an atmospheric pressure plasma jet is diagnosed by the electric field induced second harmonic(E-FISH)method,and the time-resolved electric field under different conditions is *** positive pulse voltage is applied,the electric field has a peak of about 25 kV cm-1at the rising edge of the voltage pulse.A dark channel is left behind the plasma bullet and the electric field in the dark channel is about 5 kV *** the other hand,when negative pulse voltage is applied,the electric field has a peak of-16 kV cm-1when the negative voltage is increased to-8 kV.A relatively bright channel is left behind the plasma head and the electric field in this relatively bright channel is about-6 kV *** the pulse rising time increases from 60 to 200 ns,the peak electric field at both the rising edge and the falling edge of the voltage decreases *** 0.5%of oxygen is added to the main working gas helium,the peak electric field at the rising edge is only about 15 kV *** the other hand,when 0.5%nitrogen is added,the peak electric field increases especially at the falling edge of the voltage pulse,where it increases reversely from-12 to-16 kV cm-1(the minus sign only represents the direction of electric field).

关键词： atmospheric pressure plasma jet electric field electric field induced second harmonic

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Effect of Dark Periods on Subsequent Restrike in the Discontinuous Development of Positive Leader 8

Effect of Dark Periods on Subsequent Restrike in the Discont...

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8th Asia Conference on Power and Electrical engineering, ACPEE 2023

作者： Liu, Lei Liu, Yang Luo, Bing Zhong, Zheng Fan, Caijin Wang, Tingting He, Junjia Chen, Lixue China Southern Power Grid Electric Power Research Institute Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345520

Research on the physical mechanism of discontinuous development for the positive leader discharge is fundamental for optimizing the external insulation design of transmission lines. The effect of dark periods on the subsequent restrike, as a factor determining the discontinuous development feature, is investigated by means of a current measurement system with a wide dynamic range and direct optical imaging. With the increase of the voltage change rate, the duration of dark periods decreases, and the subsequent restrike is facilitated to occur and end the dark period. In addition, the discharge current and the amount of charge, representing the electrical characteristics, increase in the restrike process with the increase of these electrical parameters in the previous dark period. Two equations are suggested for fitting positive correlations of these parameters in the dark period and restrike processes. © 2023 IEEE.

关键词： Electric power transmission

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Analysis of End Effect on Thrust Ripple in Linear Brushless Doubly-Fed Machine

Analysis of End Effect on Thrust Ripple in Linear Brushless ...

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2022 International Electrical engineering Congress, iEECON 2022

作者： Ge, Jian Xu, Wei Bao, Zhen Zhang, Yaping Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665402064

The linear brushless doubly-fed machine (LBDFM) as a novel type of machine has attracted extensive attention in recent years. Due to the complex magnetic fields and end effect, there is rich low-frequency thrust ripple in LBDFM. In order to make the physical process of thrust ripple clear, the end effect on the winding magnetomotive force (MMF) is studied. Firstly, the shifted slot vector affected by the end is obtained. Then, a negative sequence magnetic motive force is analyzed with the certain winding configuration. Finally, the generation of low-frequency thrust ripple is explained. The analysis results are verified by finite element algorithm (FEA) and the proposed method can be applied to most linear machines with short primary. © 2022 IEEE.

关键词： Winding

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Two-Degree-of- Freedom Sensorless Control Method Combining Extended Adaptive Full-Order Observer with Disturbance-Observer Based Controller for Induction Machine Drives 6

Two-Degree-of- Freedom Sensorless Control Method Combining E...

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6th International Conference on Energy Systems and Electrical Power, ICESEP 2024

作者： Deng, Jiangming Cao, Fen Cheng, Siwei Xu, Wei Ge, Jian Crrc Zhuzhou Locomotive CO Ltd. Zhuzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China Institute of Electrical Engineering Chinese Academy of Science Beijing China

ISBN: (纸本)9798350353563

In sensorless control strategies for induction machines (IM), achieving high dynamic performance in speed control and observation is crucial. However, the sensorless control approach often struggles to provide satisfactory dynamic responses to varying speed references and load disturbances due to the extra dynamics between actual and observed speeds. To address this challenge, a systematic design method for the speed controller and observer in this paper. The proposed method combines the extended adaptive full-order observer (EAFO) with the disturbance observer-based controller (DOBC). As a result, the proposed method achieves a decoupled two-degree-of-freedom (2DOF) characteristic, enhancing speed tracking and load disturbance rejection abilities. Numerous simulation and experimental results demonstrate the superiority of the proposed algorithm. © 2024 IEEE.

关键词： Disturbance rejection

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Rotor Winding Short Circuit Fault Protection Method of Variable Speed Pumped Storage Unit Based on Stator and Rotor Side Differential Current 17th

Rotor Winding Short Circuit Fault Protection Method of Varia...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： He, Rufei Qiao, Jian Wang, Wenhui Yin, Xianggen Peng, Yumin Zhang, Hao CSG PGC Power Storage Research Institute Guangzhou510950 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904501

The rotor winding structure of variable speed pumping storage unit is different from that of traditional fixed speed unit, so the types and characteristics of short circuit faults of the rotor windings of the two types of units are obviously different. Therefore, a fault protection method for rotor windings of variable speed pumping storage unit is proposed based on the differential current of different frequency on fixed rotor side. Firstly, the feasibility of differential protection using different frequency current of stator and rotor is analyzed. Then, the measured current at the stator end and the rotor slip ring were used to extract the measured current to identify the peak value, angular frequency and phase Angle parameters of the fixed and rotor-side current online, and the rotor-side current was converted in real time based on the calculation results of the identification. The protection action current and braking current are calculated by using the converted current and stator side measurement current, which constitute the differential protection criterion. Finally, an actual variable speed pumping storage unit is taken as an example to establish its mathematical simulation model, and the simulation results verify the effectiveness of the proposed method. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Stators

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Analytical Model and Topology Optimization of Doubly-fed Induction Generator

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 162-169页

作者： Lu Sun Haoyu Kang Jin Wang Zequan Li Jianjun Liu Yiming Ma Libing Zhou the State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE Dongfang Electric Machinery Co. LtdDongfang Electric CorporationDeyangChina CSG PGC Energy Storage Research Institute Southern Power Grid Energy Storage Co.LtdGuangzhou 510630China

As the core component of energy conversion for large wind turbines,the output performance of doubly-fed induction generators (DFIGs) plays a decisive role in the power quality of wind *** realize the fast and accurate design optimization of DFIGs,this paper proposes a novel hybriddriven surrogate-assisted optimization *** firstly establishes an accurate subdomain model of DFIGs to analytically predict performance ***,taking the inexpensive analytical dataset produced by the subdomain model as the source domain and the expensive finite element analysis dataset as the target domain,a high-precision surrogate model is trained in a transfer learning way and used for the subsequent multi-objective optimization *** on this model,taking the total harmonic distortion of electromotive force,cogging torque,and iron loss as objectives,and the slot and inner/outer diameters as parameters for optimizing the topology,achieve a rapid and accurate electromagnetic design for ***,experiments are carried out on a 3MW DFIG to validate the effectiveness of the proposed method.

关键词： Doubly-fed induction generators Accurate subdomain model Surrogate-assisted Transfer learning

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Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

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Plasma Science and technology 2022年第10期24卷 139-146页

作者： Shouqi XIONG Donghui XIA Mei HUANG Gangyu CHEN Wenting WENG Guoyao FAN 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 Southwestern Institute of Physics Chengdu 610041People's Republic of China

The accurate power measurement is important for an ECRH system in *** dummy load is designed and developed for the measurement of the millimeter wave *** work analyzes the dummy load based on the quasi-optical method and the ray tracing *** reflectivity and thermal deposition of the dummy load have been considered to ensure the safety of the entire ***-power tests have been carried out at a 105 GHz/500 kW ECRH *** results of the tests indicate that the designed dummy load is stable and valid.

关键词： dummy load power measurement quasi-optical method ray tracing ECRH

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An electric energy peer-to-peer trading strategy considering an in-situ energy storage sharing model for electric vehicle exchange electricity stations 8

An electric energy peer-to-peer trading strategy considering...

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8th International Conference on Energy System, Electricity, and Power, ESEP 2023

作者： He, Yingjing Wang, Cenfeng Zhu, Keping Wang, Weiming Sui, Quan Economic and Technological Research Institute State Grid Zhejiang Electric Power Co. Ltd. Hangzhou310008 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China

ISBN: (数字)9781510679801

ISBN: (纸本)9781510679795

With the massive penetration of clean, distributed energy sources, user-side energy storage presents an increasingly complex picture, but its potential to participate in the shared energy storage market has received less attention. To this end, this paper proposes a peer-to-peer trading (i.e., direct trading of electricity between users) strategy for electricity that takes into account the energy storage at the exchange electricity station (EES) and the in-situ sharing model. Firstly, a shared energy storage system based on peer-to-peer trading is constructed by combining the energy storage demand on the user's side and the operation optimisation demand of electric vehicle exchange electricity station (EVEES), with the joint participation of EVEES and users. Based on this, two parallel two-tier P2P transaction frameworks are established for electric vehicle user (EVU)-EESs and community-EESs, it improves the overall operational efficiency of the energy storage business while safeguarding user privacy protection claims. Secondly, in order to solve the problem of the difficulty of achieving the overall optimisation of the scheduling framework with the participation of multiple actors (i.e., EESs, users and communities), Alternating Direction Method of Multipliers (ADMM) was introduced to design a two-layer optimised energy sharing model for community-EES-EVU. Simulation results show that the strategy proposed in this paper can guarantee the security of privacy and the economy of energy use of each subject in the shared energy storage system (SESS), and also provide power support for the external grid. The paper provides a unique new perspective on the shared energy storage model. © 2024 SPIE.

关键词： Electric vehicles

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