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18th International Conference on Developments in Power System Protection (DPSP APAC 2025)

作者： Ruizhi Ma Yu Chen Minghao Wen Ke Han State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

ISBN: (数字)9781837242900

Rapid restarting of high-voltage DC transmission system after a fault is crucial for the stable and reliable operation of the system. Conventional restart methods have the disadvantages of blindness, long restart process, and high restart failure rate. Restarting on permanent fault will cause more impact on the system or lead to system shutdown. To solve this problem, this paper proposes an adaptive restart scheme based on voltage injection. First, a fault property identification mode based on open-loop voltage control and closed-loop current control is proposed to be incorporated into the LCC control system. Secondly, the change rule of line voltage and current in the fault identification stage is analyzed based on the equivalent circuit diagram of the system under temporary and permanent faults. Finally, an adaptive restart scheme for HVDC transmission system based on voltage injection is proposed. The proposed scheme realizes the injection of voltage signals into the system after fault isolation while limiting the system current, which improves the safety of the system during fault restart. The proposed scheme can be realized based on the existing control system without additional equipment. The scheme has good noise and interference immunity, and its realization has a low sampling rate requirement, which has a good prospect for engineering applications. An electromagnetic transient model of the LCC-HVDC transmission system is constructed in PSCAD/EMTDC based on the engineering parameters, and simulations are carried out for verification. The simulation results show that the proposed scheme can correctly recognize the property of faults and can realize the restart of the system after the fault.

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PLL SYNCHRONIZATION TRANSIENT STABILITY ANALYSIS OF VSC UNDER SINGLE-PHASE-TO-GROUND AC FAULT 10

PLL SYNCHRONIZATION TRANSIENT STABILITY ANALYSIS OF VSC UNDE...

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10th Renewable Power Generation Conference, RPG 2021

作者： Lin, Chensheng Li, Yingbiao Hu, Jiabing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839536069

Controlling negative sequence currents at zero is feasible in practice, which can improve the performance of voltage-source converters (VSCs) during asymmetric ac faults. VSCs are usually synchronized with the grid via the phase-locked loop (PLL) However, the synchronization stability is affected by the negative sequence current of VSCs. Hence, this article analyses the PLL transient stability of PLL-synchronized VSCs during single-phase-to-ground ac fault. The parametric impacts of the phase-locked loop and the effect of positive/negative sequence current on synchronization stability are revealed analytically, via employing the phase portrait approach. It is revealed that the loss of synchronization (LOS) possibly arises if VSCs suppress negative sequence current to zero under single-phase-to-ground ac faults. Time-domain simulations are performed in Matlab/Simulink, and the obtained results validate the theoretical findings. © The Institution of engineering and technology.

关键词： Phase locked loops

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A Temperature Monitoring Method for Power Electronic Converter Based on Infrared Image and Object Detection Algorithm 4

A Temperature Monitoring Method for Power Electronic Convert...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Yang, Hongcheng Chen, Yu Kang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728171494

Power electronic converters are more and more widely used, and abnormal temperature of converter components is the most important factor of converter failure. In order to improve the reliability of the converter design, it is necessary to monitor the temperature of key components in the converter during the prototype test stage. The temperature measurement method of infrared thermal images has rich temperature information, wide coverage, and does not affect the original circuit design. It is widely used in circuit temperature measurement occasions. However, in the current automatic temperature measurement methods, it is necessary to manually establish a standard matching template for the infrared thermal image of the circuit to be tested, which indicates a large workload and poor versatility. This paper proposes a method for fully automatic temperature monitoring of converter components. This method is based on a deep learning target detection algorithm, which can automatically identify the type of converter components, obtain partial infrared thermal images of components through heterogeneous image registration, and achieve accurate component temperature monitoring. The advantages of this method are: 1) there is no need to manually establish a standard template for each converter, and the versatility is good;2) it is fully automatically when the monitoring the temperature of converter components without manual intervention;3) it is easy to implement and promote due to low cost of hardware system. Finally, the experimental results verify the feasibility and accuracy of this method. © 2021 IEEE.

关键词： Object detection

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electromagnetic Performance Analysis of a Dual-rotor Ironless Stator PM Machine

Electromagnetic Performance Analysis of a Dual-rotor Ironles...

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2022 International Conference on Electrical Machines, ICEM 2022

作者： Wang, Zhenyu Yang, Jiangtao Chen, Hang Ye, Caiyong Huang, Shoudao Hunan University College of Electrical and Information Engineering Changsha410082 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

This paper investigates the electromagnetic performance of a dual-rotor ironless stator permanent magnet machine for flywheel energy storage system. Since the stator is made of nonmagnetic material, the armature winding is exposed to the magnetic field directly and becomes the object of electromagnetic force. The air-gap flux density is not constant along the radial direction and the phase of the flux density is different along the circumferential direction. This makes the electromagnetic performance calculation, such as back electromotive force (back-EMF) and electromagnetic force, different from the common iron-core machine. Additionally, the uneven flux density distribution will lead to circulating current in the armature winding. In this paper, the expressions of back-EMF and torque are derived. In addition, this paper gives the condition for eliminating the circulating current between the strands of the ironless machine. This work provides reference for the analysis and design of ironless machine. © 2022 IEEE.

关键词： Stators

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Analysis and Experiment of Homopolar Inductor Alternator With an Active Compensated Winding in Capacitor Charging Power Supply System

Analysis and Experiment of Homopolar Inductor Alternator Wit...

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作者： Guo, Songlin Yu, Kexun Yi, Zhengkang Lai, Houchuan Xie, Xianfei The State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China The Beijing Aerospace Automatic Control Institute Beijing100854 China The Southwest Institute of Technical Physics Chengdu610041 China

Homopolar inductor alternator (HIA) typically plays a key role in the capacitor charging power supply (CCPS) system. However, HIA cannot meet the growing demand for higher power density due to its unipolar magnetic field. In order to obtain a compact HIA-CCPS with higher power density, a novel HIA named ACWHIA based on the active compensation theory is proposed in this article, by adding an active compensated winding (ACW) in the traditional HIA. The main function of ACW connected in series in the DC charging circuit, is to increase the machine's transient voltage for improving the system's power density. It is absolutely different from most of the existing pulsed alternators with compensated windings, whose theory is to reduce the transient inductance to increase the power density. In this article, the influence of the transient voltage on the charging performance is first analyzed. Second, the scheme and operating principle of ACWHIA are proposed. Third, the electromagnetic characteristics of the machine and the model of ACWHIA-CCPS are analyzed in detail by theoretical analysis. Then, a simplified model of the ACWHIA-CCPS system is proposed, and this model simplifies the analysis and shows the operating principle of the active compensation winding. Finally, a platform of ACWHIA is developed and the experiments are carried out. The results indicate that the novel machine can be an attractive choice to improve the power density of HIA-CCPS. © 2023 IEEE.

关键词： Winding

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ANALYSIS OF THE AMPLITUDE AND FREQUENCY CHARACTERISTIC OF STEAM TURBINE GENERATOR'S INTERNAL VOLTAGE UNDER ASYMMETRIC FAULT IN SERIES COMPENSATION SYSTEM 10

ANALYSIS OF THE AMPLITUDE AND FREQUENCY CHARACTERISTIC OF ST...

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10th Renewable Power Generation Conference, RPG 2021

作者： Chen, Yanrui Hu, Jiabing Li, Yingbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839536069

A thermal power transmission system via series capacitor compensation is a common transmission method in the power system. The series capacitor compensation is utilized to improve the transmission capacity of the transmission line. However, it may cause rotor shaft torque amplification of the steam turbine generator during the transient process, and especially have a non-negligible impact on internal voltage amplitude and frequency characteristics of the generator under the system asymmetric fault. Based on the rotor shaft model of the steam turbine generator in the IEEE sub-synchronous oscillation first benchmark model, the no-load internal voltage expression of the steam turbine generator considering the shaft oscillation is calculated in this paper firstly. Furthermore, the influence of the rotor mode on the generator's internal voltage under the series compensation system asymmetric fault is obtained by analytical calculation, DQG the amplitude and frequency time-varying characteristics are summarized. Finally, the corresponding system model is built in PSCAD/EMTDC to verify the correctness of the analytical expression and time-varying characteristic of the internal voltage. © The Institution of engineering and technology.

关键词： Electric power transmission

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Distribution Dynamic Operating Security Space Characterization for Aggregation and Congestion Capacity Evaluation of Virtual Power Plant

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IEEE Transactions on Smart Grid 2025年

作者： Song, Meng Xu, Zekai Gao, Ciwei Yan, Mingyu Hu, Qinran Southeast University School of Electrical Engineering Nanjing210096 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

Virtual power plant(VPP) can manage distributed energy resources (DERs) to serve the grid, which should satisfy the power flow constraints. However, the distribution system operator(DSO) monopolies system parameters and VPP cannot directly access them. To solve the coordination problem between distribution operation security and VPP management, the distribution dynamic operating security space (DOSS) is proposed to constrain the DER output power for VPP aggregation and congestion capacity evaluation. First, a hybrid fuzzy modeling method based on the distribution system security region is employed to characterize DOSS, and less information exchange between VPP and DSO is required. Data privacy is well respected, and the computational complexity is also reduced. Second, the enhanced opposite direction searching algorithm and the generalized credibility-based piecewise membership crisp method are applied to achieve DOSS's type-reduction and defuzzification for VPP aggregation. This clarifies distribution security risks on VPP through DOSS’s credibility levels. Finally, VPP congestion capacity is proposed to quantify security constraint impacts on the VPP aggregation capacity, which can help coordinate the VPP economic and DSO secure operations. Case studies demonstrate that the proposed methodology can effectively embed the distribution operation security constraints into VPP aggregation and show higher applicability and lower conservativeness than existing approaches. © 2010-2012 IEEE.

关键词： Sensitive data

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Analysis of Consequent Pole Vernier PM Machine Based on advanced MMF-Permeance Model 3

Analysis of Consequent Pole Vernier PM Machine Based on Adva...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Fang, Li Li, Dawei Zhang, Yuanzhi School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China School of Electrical Engineering and Automation Wuhan University Wuhan430072 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Consequent-pole (CP) vernier permanent magnetic machine (VPMM) has attracted increasing interest owing to higher torque output and less PM usage compared to the surface-mounted VPM (SVPMM). Via the simplified equivalent magneto-motive force (MMF)-dual salient permeance model, the deviated no-load air-gap flux density from FEA result is observed, which means the theoretical basis of CPVPMM has not been well established due to the unconventional consequent-pole PM structure. In this paper, an advanced MMF-permeance model is proposed which could accurately predict the air-gap flux density under different structure parameters of CPVPMM. Based on the proposed analytical method, the accurate sizing equation of CPVPMM could be established which would give helpful guidance in analyzing and designing the high-torque-density CPVPMM. © 2022 IEEE.

关键词： Machine design

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Numerical characteristics of DC breakdown and paschen curve of CF3I-N2mixtures at low pressure 5

Numerical characteristics of DC breakdown and paschen curve ...

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2024 5th International Conference on Electrical, Electronic Information and Communication engineering, EEICE 2024

作者： Wu, Yifan Wu, Hao Gao, Jiamao Yu, Shimin Chen, Zhipeng Jiang, Wei Wang, Zhijiang International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Sch Elect & Elect Engn Huazhong University of Science and Technology Wuhan430074 China State Grid Jiangsu Electric Power Co Taizhou225300 China School of Electronics and Information Engineering Hubei University of Science and Technology Xianning437100 China School of Physics Huazhong University of Science and Technology Wuhan430074 China

In this study, the DC breakdown characteristics of CF3I-N2 mixtures at low pressure are investigated and compared with those of pure CF3I to assess their insulating properties. Utilizing the particle-in-cell/Monte Carlo collisions (PIC/MC) model, we explore the breakdown process in detail, analyzing electron and ion kinetics across various phases. Our findings reveal that the CF3I-N2 mixture exhibits a faster breakdown rate than pure CF3I but requires more time to achieve a steady state. Additionally, we examine the Paschen curve of CF3I-N2 at varying pressures, discovering that the insulating performance improves with higher CF3I proportions at increased pressures. This study contributes to understanding the insulating behavior of CF3I-N2 mixtures, offering insights for their application in environmentally friendly high-voltage insulation technologies. © Published under licence by IOP Publishing Ltd.

关键词： Insulation

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Optimized Design of a Thermionic Electron Gun Applied to a High-power FEL Injector 4

Optimized Design of a Thermionic Electron Gun Applied to a H...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Peng, Xiaoyu Hu, Tongning Peng, Yufei Long, Jidong Deng, Jianjun Feng, Guangyao University of Science and Technology of China School of National Synchrotron Radiation Laboratory Hefei230000 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China GUSU Laboratory Suzhou215000 China Suzhou Laboratory Suzhou215000 China Academician of the Chinese Academy of Engineering Chinese Academy of Engineering Physics Institute of Fluid Physics China

ISBN: (纸本)9798350305562

This paper mainly designs a high-power free electron laser injector system, which has a low-emittance electron gun using a gridded thermionic cathode. The distance between the anode and the radio frequency cavity exit is designed to be as short as possible in the manufacturing level. In the process of optimizing the electron gun, simulation by cell signaling technology is mainly conducted on the effects of the shape, hole spacing, wire size, and thickness of the grid on the electron beam's emittance, particle passing rate and so on. Therefore, the optimal parameters of the electron gun, especially the structure of the grid and the grid bias voltage, are obtained, generating a uniformly distributed current with current intensity of 0.5 A, the pulse length of 1 ns, and a normalized root mean square emittance of 1.6 mmmrad. In order to reduce the increase in emittance caused by the space charge effect in the low energy region, a -50 kV electron gun is connected to a 476 MHz sub-harmonic buncher through a drift section with the solenoid. The optimization in Parmela resulted in excellent longitudinal phase space, beam spot size, and emittance of the electron beam at the injector exit. © 2023 IEEE.

关键词： Electrons

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