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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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Effect of surface morphology on armature melt wear

Effect of surface morphology on armature melt wear

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Bingxuan Zhao Lixue Chen Shengqin Xu Xuan Xu Wenhao Zhang Tingyun Xiao State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

Armature melting during electromagnetic launch affects the electrical contact characteristics between armature and rail, which in turn affects the launching process and the service life of the launcher. A coupled multi-physics field model considering rough surfaces is constructed. Based on this, the influence law on armature erosion characteristics is analyzed. the results show that the higher the armature surface characteristic scale factor the lower the overall armature temperature, the later the melting onset time, but the more uneven armature surface melting; the higher the surface fractal dimension the less armature melting. The results provide a reference for the optimization of armature surface processing.

关键词： Rails Particle beams Temperature Surface morphology Armature Surface roughness Rough surfaces electromagnetics Surface treatment Optimization

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A Fundamental-Harmonic Hybrid Power Transfer Strategy for Bidirectional Inductive Power Transfer 4

A Fundamental-Harmonic Hybrid Power Transfer Strategy for Bi...

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

作者： Jiang, Mengjie Chen, Changsong Chen, Haowen Huang, Xuezheng Jia, Shuran Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

For bidirectional inductive power transfer (BIPT) system, transmission efficiency optimization and widen zero voltage switching (ZVS) is important. In the BIPT system, to optimize the above issues, the dual-phase-shift (DPS) and triple- phase-shift (TPS) with the fundamental component are adopted. However, as the load power required of the system is decreased, the realization of ZVS is difficult, which is necessary to reduce the phase shift angle (PSA). And the system transmission power factor and efficiency will decrease. In this paper, fundamental- harmonic-hybrid (FHH) power transfer strategy is proposed for the optimization of the ZVS and system efficiency. Firstly, the relationship of the ZVS and efficiency with the transfer power of the BIPT is analyzed. Secondly, the implementation of strategy FHH is obtained, including the application condition, the realization of ZVS and the efficiency improvement. Finally, the simulations are performed. Compared with TPS strategy with the fundamental component, the transmission efficiency and power factor with FHH is improved under light load condition. © 2021 IEEE.

关键词： Zero voltage switching

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A Closed-Loop Starting Method of Sensorless Brushless DC Motor 4

A Closed-Loop Starting Method of Sensorless Brushless DC Mot...

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

作者： Hao, Jiarui Guo, Haifeng Li, Yujiao Kong, Wubin Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China

ISBN: (纸本)9781728171494

The sensorless brushless DC motor has broad application prospects, but the sensorless control method of commutation by detecting the motor back electromotive force (EMF) is not suitable for low speed conditions, making it difficult to start stably and reliably. This paper analyzes the change of DC bus current when the control system delays switching sectors, and obtains the motor commutation timing by detecting the current change rate. A closed-loop speed control system for the starting process of sensorless brushless DC motor is designed, and the three stages of the starting process is analyzed. Finally, the designed control system has been experimentally verified that the brushless DC motor can be started reliably. © 2021 IEEE.

关键词： Brushless DC motors

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Transient Synchronization Stability Analysis and Assessment of DFIG System Under Severe Faults

arXiv

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arXiv 2025年

作者： Xu, Hongsheng Zhan, Meng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

In the transient stability analysis of renewable energy grid-tied systems, although a large amount of works have devoted to the detailed electromagnetic transient simulation and the stability analyses of during-fault stage, the whole low-voltage ride through (LVRT) process and relevant transient stability mechanism remain to be uncovered. Taking the doubly fed induction generator system as the objective, this paper divides the transient processes into four different stages, including the pre-fault, during-fault, early post-fault, and late post-fault ones, establishes the full mechanism models for each stage, and studies the switching dynamics in detail. It is found that the during-fault dynamics can be determined by the phase-lock loop second-order equation within the framework of the generalized swing equation (GSE). For the early post-fault stage, it can be treated as a series of quasi-steady states and its dominant driving system dynamics can still be described by the GSE. Based on the local dynamics of unstable equilibrium point, the system transient stability can be completely determined by whether the initial state of the early post-fault stage is within or out of its basin of attraction (BOA). Based on these observations, the BOA-based and equal area criterion (EAC)-based transient stability assessment methods are developed, which are supported by broad numerical simulations and hardware-in-the-loop experiments. This work provides a clear physical picture and perfectly solves the difficult stability analysis problem when severe faults and LVRT have to be considered in most of DFIG engineering situations. Copyright © 2025, The Authors. All rights reserved.

关键词： Transient stability

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A Numerical Model of Magneto-Electro-Thermo-Mechanical Characteristics at the Armature-Rail Contact Interface

A Numerical Model of Magneto-Electro-Thermo-Mechanical Chara...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Xuan Xu Lixue Chen Shengqin Xu Wenhao Zhang Bingxuan Zhao Tingyun Xiao State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

The movement of the armature during the launch process of the electromagnetic railgun is a type of high-speed sliding electrical contact. The characteristics inside the barrel cannot be measured directly. In this paper, a better prediction numerical model is developed. The model involves mechanical calculation part into previous electromagnetic thermal coupling relationships. Based on the contact pressure between the armature and rail obtained from the mechanical calculation part, as well as the rough surface characteristics, the influence of contact resistance on electromagnetic and temperature distribution is also considered. Finite difference formats of bilinear interpolation characteristic method and exponential high-order compact alternating direction implicit method are used to solve the electromagnetic field distribution and temperature field distribution respectively. Finite element incremental superposition method based on the Updated Lagrangian description is used to solve the stress distribution. The contact interface characteristics of rectangular armature and C-shaped armature without considering contact resistance and considering contact resistance are calculated. Results show that the electromagnetic distribution characteristics of C-shaped armatures are significantly better than those of rectangular armatures.

关键词： Couplings Temperature distribution Surface resistance Armature Contact resistance Railguns Surface roughness Numerical models electromagnetics Stress

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Numerical simulation of dynamics behavior of pulsed-DC helium plasma jet confined by parallel magnetic field at atmospheric pressure

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Physical Review Research 2024年第3期6卷 033028-033028页

作者： Yinghua Liu Peiqi Yin Boping Xu Dawei Liu Liangwen Pi Yuxi Fu Yishan Wang Wei Zhao Jie Tang State Key Laboratory of Transient Optics and Photonics Beijing 100049 People's Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Center for Attosecond Science and Technology

A two-dimensional axisymmetric fluid model is used to simulate the dynamics behavior of an atmospheric-pressure helium plasma jet in the presence of a parallel magnetic field. The plasma jet is generated in a coaxial dielectric barrier discharge (DBD) driven by pulsed direct-current voltage. Comparative analysis of the plasma jet with and without the parallel magnetic field indicates that a slightly thinner plasma sheath inside the tube is present with the parallel magnetic field as a result of the decreased accumulated electrons on the inner surface of dielectric tube. After the streamer propagates outside the tube, a little more concentrated electron distribution in the annular wall is observed by applying the magnetic field because of the reduced electron diffusion in the radial direction and the confinement effect of the magnetic field on the electrons in the avalanche heads. The tiny reduction in the length of plasma jet is attributed to the E × B drift of charged particles. These results demonstrate that the parallel magnetic field has no apparent effect on the propagation of the plasma jet, and it contributes little to the performance improvement of the coaxial DBD, which agrees well with the previous experimental observations. This little impact of the parallel magnetic field on the coaxial DBD plasma jet may result from negligible contribution of the memory effect to the sole discharge pulse as well as the weak confinement effect of the applied magnetic field on the surface electrons that moves along the magnetic field lines under electrostatic repulsion.

关键词： Plasma discharges Low-temperature plasma

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Optimization design of three-phase common box GIS double-break disconnector based on NSGA-II algorithm and improved BP neural network 9

Optimization design of three-phase common box GIS double-bre...

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9th International Conference on Energy System, Electricity, and Power, ESEP 2024

作者： Li, Jinbin Ren, Jieshuai Zhang, Hongrui Yuan, Zhao Chen, Jun Wen, Yaqin Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan 430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Elec-tronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781510691728

The GIS double-break isolator switch features design characteristics such as miniaturization and compactness. Compared to traditional isolators, it faces more stringent challenges in terms of electrical insulation, structural strength under pressure, and temperature rise performance. Therefore, optimizing core dimension parameters within limited space to enhance its insulation, pressure resistance, and temperature rise performance is of great significance. To this end, finite element methods were employed to establish simulation models for the GIS electrostatic field, stress field, and temperature field, which were subsequently analyzed to identify key optimization locations and dimensional parameters. In order to handle the large computational load involved in the optimization of the field models, while balancing both solution accuracy and computational efficiency, a Box-Behnken experimental design strategy was used for data sample collection, and a GA-BP neural network model was developed. By integrating the neural network model with the NSGA-II algorithm, a global optimal solution set and the corresponding optimal values were identified under multi-objective conditions. After optimization of the core dimension parameters of the isolator switch, the field distributions at critical locations were significantly improved, resulting in a notable enhancement in the overall performance of the double-break isolator switch. © 2025 SPIE.

关键词： BP neural network Double-break disconnector electrostatic field NSGA-II algorithm stress field

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A Common-Mode Active EMI filter Design for Modular Multilevel Converters 1

A Common-Mode Active EMI filter Design for Modular Multileve...

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1st IEEE International Power Electronics and Application Symposium, PEAS 2021

作者： Liu, Jianrui Jiang, Dong Sun, Wei Zhang, Yechi Chen, Jianan State Key Laboratory of Advanced Electromagnetic Engineering And Technology Huazhong University of Science And Technology Wuhan China

ISBN: (纸本)9781665413596

Modular Multilevel Converter (MMC) is one of the most concerned multilevel converters recently. It has been more and more widely used in High Voltage Direct Current system due to its advantages such as high modularization and low power loss. However, a large number of high frequency semiconductor devices will cause serious electromagnetic Interference (EMI) during the operation of MMC. This paper proposed a Common-Mode (CM) current based active EMI filter (AEF) to suppress the CM EMI in MMC system. The influence on the performance of each part of the AEF is also studied. Through the simulation and experiment, it is verified this AEF can achieve about 20dB reduction effect for DC side CM current in MMC system within 1MHz. © 2021 IEEE.

关键词： Signal interference

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Dual-Loop PQ Control Scheme for Transient Stability Enhancement and Current Limitation of VSG

Dual-Loop PQ Control Scheme for Transient Stability Enhancem...

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2021 International Conference on Power System technology, POWERCON 2021

作者： Sun, Kun Yao, Wei Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665407373

The transient angle instability and overcurrent of the virtual synchronous generator (VSG) under severe fault are risks for the stable and safe operation. Existing works have proposed some efficient methods for the transient stability enhancement or current limitation of VSG. Yet, the consideration for both of them is rarely studied. Moreover, the reasonable parameter design method for the control is usually lacked. In this paper, with the large signal model of VSG, a dual-loop PQ control scheme is introduced. With the proposed method, both the transient angle stability and overcurrent can be controlled simultaneously. In addition, how to design the reasonable coefficients of the proposed control scheme with additional requirement of output active power is also presented. The effect of the proposed method can be achieved with the coefficients in the allowable range. Finally, this method is validated by simulation results. © 2021 IEEE.

关键词： Synchronous generators

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