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检索条件"机构=1State Key Laboratory of Advanced Electromagnetic Engineering and Technology"

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Antioxidant Migration on Dielectric Properties of Long-term Impregnated Insulating Oil 23

Antioxidant Migration on Dielectric Properties of Long-term ...

引用

23rd International Symposium on High Voltage engineering, ISH 2023

作者： Wang, Yucheng Li, Hua Huang, Ziqin Lin, Fuchang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan China

ISBN: (纸本)9781839539954

High voltage capacitors are widely used in electrical power systems. For better capability in applications, capacitors are impregnated with insulating oil. Polypropylene in its natural state is inherently unstable and degrades when exposed to oxygen. To avoid oxidation that occurs in the process of film forming, antioxidants are developed and used. In this paper, the polypropylene casts added respectively with antioxidant 1010, 3114, 330 and BHT were long-term impregnated in benzyl toluene oil. Secondly, the frequency domain dielectric spectroscopy method was used to study the dielectric properties of the oil. In addition, the effect of antioxidants on the polarization relaxation process of insulating oil was analyzed. The results indicate that antioxidants and small molecular polypropylene in the amorphous region of the film migrate to the oil during long-term impregnation, resulting in increases in relative dielectric constant Εr, dielectric loss tanδ and dc conductivity σdc, and affect the polarization relaxation process. Among these antioxidants, antioxidant 1010 has the greatest impact on insulating oil, while antioxidant 330 has the least impact. © The Institution of engineering & technology 2023.

关键词： Dielectric losses

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A Review on the Control Strategies for Differential Boost Inverter 26

A Review on the Control Strategies for Differential Boost In...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Li, Mengyuan Wang, Jin Wang, Hu Dai, Youlun Zhou, Libing 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)9798350317589

The differential boost inverter (DBI) has gained a great deal of interest in academia due to its advantages. Compared with conventional cascaded topology composed of a DC-DC boost circuit and a voltage source inverter, DBI needs only one-level topology to achieve boost inverter, thus has higher efficiency and lower cost. The three-phase DBI can be applied to motor drives and grid connection. Based on analyzing the structure and operating principle of three-phase DBI, this paper presents an elaborate and in-depth review of typical control strategies for three-phase DBI, including their basic principles, key features, exiting issues, and relevant suggestions, and finally reports the development tendency of the control strategies. © 2023 IEEE.

关键词： Topology

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Modified Nine-Switches High Step-up Ratio Boost-Only Y-inverter with Common Ground 26

Modified Nine-Switches High Step-up Ratio Boost-Only Y-inver...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Dai, Youlun Wang, Jin Wang, Hu Li, Mengyuan Zhou, Libing 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)9798350317589

The article proposes a modified nine-switches high step-up ratio boost-only Y-inverter with common ground. This new inverter inherits the major advantages of the double dual topology and Y-inverter, and the circuit is modified so that both input and output are common-grounded, which ensures high voltage gain in three-phase systems. Meanwhile, the circuit topology reduces three switches, without increasing voltage stress, magnetic volume, or reducing voltage gain. Eventually, a double-loop control scheme in which input current and output voltage are used as control variables is designed here for the proposed Y-inverter. The feasibility is confirmed by Simulink simulation, which has provided a basis for future research. © 2023 IEEE.

关键词： Topology

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Failure Mechanism Analysis on Single Pulse Avalanche for SiC MOSFETs 1

引用

Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power engineering

作者： Fei, Haoyang Liang, Lin Zhang, Ziyang 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)9789819943340

ISBN: (纸本)9789819943333

The avalanche failure mechanism of 1200 V 40-mΩ planar silicon carbide (SiC) metal-oxide-semiconductor-field-effect transistor (MOSFET) is investigated in this article. Unclamped inductive switching (UIS) test is performed and the junction temperature is extracted by an accurate model to illustrate the relationship between failure temperature and avalanche current. The failure temperature shows little dependence on current and a critical temperature window around 980 K ~ 1100 K is found. The probability of the latch-up of parasitic bipolar junction transistor (BJT) and metal system damage is studied by an analytical model and the thermal diffusion equation. With further theoretical analysis and validation, the failure mechanism is demonstrated as the metal system damage because the high-temperature transition exceeds the sustainable time of SiC MOSFETs. TCAD simulation is also used to verify this mechanism and the temperature evolution suggests that aluminum is likely to melt during the avalanche. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Silicon carbide

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An Improved Simplified Model of Capacitor Charging Power Supply with Homopolar Inductor Alternator Considering Field Flux Linkage and Speed Changes 6

An Improved Simplified Model of Capacitor Charging Power Sup...

引用

6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Guo, Songlin Yu, Kexun Yi, Zhengkang Wang, Jiasong Xie, Xianfei Yao, Jiakang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Tsinghua University State Key Laboratory of Tribology Beijing China

ISBN: (纸本)9798350346671

Homopolar inductor alternator (HIA) has shown its promising advantages in capacitor charging power supply (CCPS). For accelerating HIA-CCPS system design process, researchers have been making efforts to simplify the simulation analysis, but the models were not universal or effective enough. In this paper, a simplified look-up-table model considering the changes of speed and field flux linkage in HIA-CCPS is proposed. While realizing fast calculation, it can also reflect the dynamic process similar to the transient model, which is very exact and effective. © 2023 IEEE.

关键词： Table lookup

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Comparative Stability Study of Grid-Following and Grid-Forming Converters in Current Control Timescale 5

Comparative Stability Study of Grid-Following and Grid-Formi...

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5th International Conference on Electrical engineering and Control Technologies, CEECT 2023

作者： Zhou, Yunpeng He, Wei Hu, Jiabing 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)9798350342253

Oscillations in current control (CC) timescale caused by the large-scale integration of voltage-source converters (VSCs) have gained more and more attention from both academy and industry. In view of this problem, a comparative study is conducted to investigate the stability difference between gridfollowing (GFL) and grid-forming (GFM) converters in CC timescale. Firstly, the unified linearized model of GFL and GFM converters is established. Secondly, the impact paths of other control loops on the current control loop are extracted based on the proposed model. Thirdly, the characteristics of the corresponding paths in GFL and GFM converter are studied. By comparing the impact of the corresponding paths on the current control loop, the root cause of the stability difference between GFL and GFM in CC timescale is revealed. All results are verified through time-domain simulations. © 2023 IEEE.

关键词： Stability

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Nonlinear Multiscale Modeling of Multi-Machine Power Systems Integrated with Photovoltaics

Nonlinear Multiscale Modeling of Multi-Machine Power Systems...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Wu, Jiaqi Han, Miao Zhan, Meng Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Large-scale photovoltaics (PVs) connected to the power grid through power electronic equipment have greatly changed the dynamics of the traditional power systems dominated by synchronous generators (SGs), bringing significant challenges to modeling and analysis of modern power systems. In this paper, a nonlinear model of multi-machine power systems integrated with PVs is established to reveal the multi-timescale transient synchronization characteristics using the singular perturbation technique. The fast subsystem containing the dynamics of the DC voltage control, terminal voltage control, and phase-locked loop, and the slow subsystem containing the dynamics of the rotor swing can effectively reflect the dynamics of multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, respectively. The proposed model provides a clearer physical picture of dynamics in the multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, and serves as the foundational model for further stability analysis. Finally, simulation results verify the validity of the proposed model. © 2023 IEEE.

关键词： Dynamics

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A Novel Variable Impedance Design Concept of PM Fault Tolerant Machine 26

A Novel Variable Impedance Design Concept of PM Fault Tolera...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Wang, Runyu Li, Dawei Fan, Xinggang Qu, Ronghai 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)9798350317589

A novel variable impedance fault tolerant design concept is proposed in this paper for high reliable PM machines. The special fault tolerant ring structure realizes the automatic transformation of the machine from low impedance in healthy operation to ultra-high impedance in fault operation, which effectively suppresses the short-circuit current. First, the design guidelines for fault tolerant ring and the fault tolerance mechanism of variable impedance are introduced. Subsequently, two variable impedance machine topologies with separated and integrated fault tolerant rings are investigated. Finally, the prototypes are fabricated and the experimental results show that the proposed variable impedance topology has a turn-to-turn short-circuit current suppression capability that far exceeds that of the conventional fault tolerant topology. © 2023 IEEE.

关键词： Topology

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General Description of Solid Armatures in electromagnetic Railguns 10

General Description of Solid Armatures in Electromagnetic Ra...

引用

10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Chen, Lixue Zhang, Wenhao Li, Lidong Xu, Shengqin State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and 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: (纸本)9789038661353

Armature, as an important part of the electromagnetic launch system, is a current carrier which converts electric energy into kinetic energy of projectiles, and it often suffers extreme environment in the launch process. Therefore, the performance of launch system is directly affected by the armature whose structure is the fundamental of the application of launch technology. Among various armature types, solid armatures are the most widely used because of some characteristics of them, like high efficiency and low mass. Based on some key functions of solid armatures, three kinds of requirements including current-carrying capacity, mechanical pressure and electromagnetic contact pressure are proposed in this paper. Besides, research progress of material and structure of the solid armature and its optimization is also introduced in this paper. © 2024 Eindhoven University of technology.

关键词： Kinetic energy

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DC Overvoltage Analysis of GFM-controlled Wind Farm Connected via MMC-HVDC System Caused by Receiving-end AC Faults 10

DC Overvoltage Analysis of GFM-controlled Wind Farm Connecte...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Chen, Siying Cheng, Min Li, Yingbiao Yu, Jiawei Zhu, Yihua Wu, Mingkang Hu, Jiabing Yan, Jianan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering China Yunnan Power Grid China China

ISBN: (纸本)9798350351330

DC overvoltage occurs when short circuit fault exists at the receiving-end and is harmful to the safety of the system where wind farms are connected to the grid through high-voltage direct current (HVDC) transmission based on the modular multilevel converter (MMC). To address this issue, this paper first analyzed the mechanism of the DC overvoltage and innovatively proposed a strategy in which grid-forming-controlled wind farms are integrated into the AC grid through MMC-HVDC, whose sending-end applies grid-following control and constant DC voltage control. However, secondary DC overvoltage appears during the fault recovery stage and is mainly caused by the saturation of the PI controller of constant active power control. Simulations are carried out on a test with MATLAB/Simulink, and results verify the efficacy of the proposed methods in suppressing DC overvoltage that appeared during receiving-end faults and their recovery stage. © 2024 IEEE.

关键词： MATLAB

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