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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Su, Sinian Sun, Jianbo Zhang, Shuixi Wang, Honggang Wang, Shuanghong Yang, Yang Zhao, Ziqi Qu, Ronghai Wu, Huangyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Henan Power Company Luohe Power Supply Company China Henan Tailong Power EquipmentCo. Ltd China Cyan Exploring Power Technology Wuxi Co Wuxi China

ISBN: (纸本)9784886864406

The segmented rotor switched reluctance motor (SSRM) has the characteristics of a short magnetic circuit, high torque density, low wind resistance, and high efficiency compared to the traditional switched reluctance motor (SRM). However, the complex manufacturing process of SSRM acts against their use. In this paper, a new type of segmented rotor switched reluctance motor with a rotor magnetic bridge (SSRMMB) is proposed, which connects the rotor blocks into a whole. The static inductance characteristics of the SSRM and SSRMMB are investigated through electromagnetic simulation. The performance of the two motors is then comparatively analyzed under angle position control (APC) and unipolar sinusoidal excitation control (USC), with a further analysis of the reasons for any differences. The simulation results show that there is little difference in the performance of the two motors during normal operation. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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Numerical study of current density on armature and rail interface with dynamic contact

Numerical study of current density on armature and rail inte...

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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： Jinghan Xu Shengguo Xia Lixue Chen Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. The contact pressure and area vary with the input current, sharing similar trends, which show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact.

关键词： Rails Particle beams Contacts Dynamics Current distribution Armature Market research Numerical models electromagnetics Optimization

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Small-Signal Stability Analysis of Parallel Grid-Connected System with Grid-Forming Converter and Grid-Following Converter

Small-Signal Stability Analysis of Parallel Grid-Connected S...

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

作者： Xiayan Li Changsong Chen Lin Gan Chenxi Bai Taihang He State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

In order to guarantee the stable operation of new energy sources when connected to the power system through converters, it is of paramount importance to conduct thorough research the small-signal stability of parallel grid-connected system with grid-forming converter (GFM) and grid-following converter (GFL). Initially, the state-space small-signal model of the parallel grid-connected system with GFM and GFL are derived. Subsequently, the impact of the phase-locked loop (PLL) bandwidth, virtual inertia, and reactive power loop integral coefficient on system stability is assessed using the eigenvalue locus method. Moreover, the participation factor analysis method is employed to identify the dominant state variables of the oscillatory mode. Finally, the correctness of the theoretical analysis is validated using PLECS.

关键词： Reactive power Grid following Bandwidth Power system stability Stability analysis Eigenvalues and eigenfunctions Circuit stability Phase locked loops Integrated circuit modeling Grid forming

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Characterization of on-state resistance of electrically triggered vacuum surface flashover switch

Characterization of on-state resistance of electrically trig...

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Electrical engineering and Control Science (IC2ECS), International Conference on

作者： Yingjie Fu Luokang Dong Mengbing He Zhengzheng Liu 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: (数字)9798331510107

ISBN: (纸本)9798331510114

Electrically triggered Vacuum Surface Flashover Switches (VSFS) are suitable for high voltage and high power conversion applications because of their advantages of high turn-on speed, high insulation recovery speed, small size, and simple structure. Low on-state resistance, which determines the output efficiency of the pulsed power system and its own lifetime, is an important index of high-performance VSFS. In this paper, the variation rule of the on-state resistance of VSFS under square wave current condition and exponential decay current condition and the influencing factors are investigated by experiment. The experimental results show that in the on-state stage, the operating voltage has a greater effect on the VSFS on-state resistance, and the trigger energy have a smaller effect on the VSFS on-state resistance.

关键词： Electrical engineering Insulation Surface waves Surface resistance High-voltage techniques Flashover Market research Power conversion Voltage control Pulsed power systems

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The Impact Analysis of Line Inductance on System Amplitude and Frequency Stability in the Converter Interfaced System

The Impact Analysis of Line Inductance on System Amplitude a...

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International Conference on Power and Energy technology (ICPET)

作者： Qiumeng Xu Sicheng Wang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

With the transition to cleaner energy sources, a high proportion of renewable devices often needs to be connected to the grid through long transmission lines, which increases the risk of system instability. The system is composed of device and network, both of which have influence on system stability. The impact of device control parameters on system stability has been widely studied, but the impact of network on system stability should not be overlooked. This paper focuses on the line inductance in the network. Firstly, it elucidates the implications of the system Amplitude and Frequency (A&F) stability, considering the dynamic characteristics of both device and the network. Secondly, it analyzes the high-order dynamic characteristics of the inherent relationship between the excitation of the amplitude/frequency of internal voltage and the response of active/reactive current, under the constraints imposed by line inductance in the network. This analysis reveals the essence of the dominant feature of this relationship, which is influenced by the system oscillation frequency. Finally, the system oscillation frequency was analyzed through closed-loop simulation, which affects the A&F stability of the system by affecting the energy storage capacity of the line inductance. This paper establishes a general understanding of the energy storage capacity of line inductor in the grid and lays the foundation for further understanding and analyzing of the mechanism of power system instability problems.

关键词： Inductance Renewable energy sources Power transmission lines Power system dynamics Voltage Power system stability Stability analysis Inductors Oscillators Energy storage

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Control Delay Compensation of Three-Level Synchronous SVPWM Based on Smith Predictor

Control Delay Compensation of Three-Level Synchronous SVPWM ...

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

作者： Zhengxiao Wang Kaifeng Liu Caiyong Ye Haoqi Liu Shanming Wan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

High-speed and high-power motor drive systems are critical for applications such as electric vehicles and industrial automation. These systems often utilize synchronous space vector pulse width modulation (SSVPWM) strategies to optimize performance. However, the multi-mode synchronous SVPWM will bring about a sudden change in the phase angle due to the switching of the number of pulses. This paper proposes a method employing the Smith predictor to correct phase and amplitude errors caused by digital control delays. Compared with the existing methods, this method can respond to phase error more quickly, especially at low carrier ratio, thus improving the stability and performance of the system.

关键词： Space vector pulse width modulation Electrical engineering Motor drives Error compensation Switches Predictive models Electric vehicles Stability analysis Inverters Delays

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Multivariate Evaluation and Enhancement Methods of the Hosting Capacity of Distributed Photovoltaic

Multivariate Evaluation and Enhancement Methods of the Hosti...

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

作者： Yaowen Liu Haishun Sun Suyue Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

Distributed photovoltaic (DPV), represented by household rooftop PV, has been developing rapidly under the promotion of county-wide rooftop PV policy in China. However, its large-scale integration has brought serious challenges to the reliability of the distribution network. It is of great significance to scientifically evaluate the hosting capacity of DPV and provide hosting capacity improvement strategies. By constructing distribution network operational reliability evaluation indexes, the maximum hosting capacity of DPV is evaluated by considering several factors, such as power flow, bus voltage, new energy consumption, etc. The DPV capacity is dispersed evenly to each distribution network bus, which more accurately simulates the dense distribution scenario of household PV and improves the accuracy of the hosting capacity results. A demand response (DR) model based on a two-layer game between load aggregators and distribution network operators is constructed, and the results of the calculation show that the maximum hosting capacity of DPV can be effectively improved based on guaranteeing the maximum interests of both parties. This research provides a scientific basis for the rational planning of the construction scale of DPV.

关键词： Photovoltaic systems Distribution networks Games Minimization Planning Reliability Indexes Load modeling Capacity planning Load flow

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Application of three-dimensional MHD equilibrium calculation coupled with plasma response to island divertor experiments on J-TEXT

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Plasma Science and technology 2024年第11期26卷 71-86页

作者： Wei XIE Yunfeng LIANG Zhonghe JIANG Yasuhiro SUZUKI Li LI Jiankun HUA Jie HUANG Alexander KNIEPS Song ZHOU Feiyue MAO Xin XU Keze LI Yutong YANG Ziyang JIN Cunkai LI the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Graduate School of Advanced Science and Engineering Hiroshima UniversityHigashi-Hiroshima 739-8527Japan College of Science Donghua UniversityShanghai 201620People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China 不详

Three-dimensional(3D) equilibrium calculations, including the plasma rotation shielding effect to resonant magnetic perturbations(RMPs) produced by the island divertor(ID) coils, were carried out using the HINT and MARS-F codes on J-TEXT. Validation of 3D equilibrium calculations with experimental observations demonstrates that the shielding effect will prevent the penetration of the edge m/n = 3/1 mode component when the ID coil current is 4 k A, while change the size of magnetic islands once the current exceeds the penetration threshold. This indicates that equilibrium calculations including the plasma rotation shielding effect to RMPs can lead to better agreements with experimental observations compared to the vacuum approximation method. Additionally, the magnetic topology at the boundary undergoes changes,impacting the interaction between the plasma and the target plate. These results may be important in understanding RMP effects on edge transport and magnetohydrodynamic(MHD)instability control, as well as divertor heat and particle flux distribution control.

关键词： magnetic topology resonant magnetic perturbation 3D equilibrium shielding effect

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Low-Voltage Ride-Through Method for Grid-Forming Converter Based on Adaptive Virtual Impedance

Low-Voltage Ride-Through Method for Grid-Forming Converter B...

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

作者： Yuanhao Zhong Changsong Chen Bowen Cui Chenxi Bai Taihang He 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: (数字)9798331530174

ISBN: (纸本)9798331530181

Due to the good weak grid adaptability and grid support capability, Grid-Forming (GFM) energy storage converter is considered to be an effective solution for the grid-connected interface of new power systems. When a symmetrical low-voltage fault occurring, grid-forming converters may face transient overcurrent problems during the fault and recovery phases. A virtual synchronous generator (VSG)-controlled GFM converter is take as the research object in this paper and a low-voltage ride-through (LVRT) control method of GFM converter is proposed, which realizes the current limitation of GFM converter under low-voltage fault by using adaptive virtual impedance. On the basis of guaranteeing the voltage source characteristics of GFM converter, L VRT control method injects reactive current into the grid according to standards. Finally, based on the Simulink/Matlab simulation platform, the effectiveness of L VRT control method for transient current suppression is verified.

关键词： Low voltage Reactive power Power system stability Synchronous generators Impedance Transient analysis Voltage control Standards Grid forming Fault currents

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Particle Simulation of Near-Cathode Sheath in Vacuum Arc 17th

Particle Simulation of Near-Cathode Sheath in Vacuum Arc

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Shi, Qilin Yang, Peixuan Ye, Jingjing Liu, Xueliang Jiang, Wei Yuan, Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Hubei Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819903566

The melting evaporation and thermal field emission of the cathode during the interrupting of the vacuum circuit breaker maintain the burning of the vacuum arc and form a near-cathode sheath. A one-dimensional implicit particle cloud/Monte Carlo (PIC/MCC) model is established, and the behavior of macroparticles is tracked to obtain the overall distribution of the plasma. The field information is obtained by solving the Poisson equation to push the particles, and the collision between particles is ignored. The simulation area is divided into three sub-domains: quasi-neutral area, transition area, and sheath area, and the particles moving to the boundaries will be removed. The relationship between sheath thickness, plasma density, and electron temperature is obtained by simulation. When the plasma density is between 1017m−3−1023m−3 and the electron temperature between 1−5eV, the numerical simulation results are in good agreement with the analytical formulas, which verifies the correctness of the PIC model. The effect of the applied transverse magnetic field on the development of the sheath in a vacuum arc is also investigated. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Plasma density

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