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Modelling and analysis of half-/full-bridge hybrid MMC when riding through DC-side pole-to-ground fault

High Voltage 2022年第3期7卷 496-509页

作者： Zhen He Jiabing Hu Lei Lin Pingliang Zeng School of Automation Hangzhou Dianzi UniversityHangzhouChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina

In a modular multilevel converter-based high-voltage direct current(MMC-HVDC)system,the dc fault ride through(FRT)control is an effective way to deal with a dc-side pole-to-ground(PTG)***,the setting of FRT duration brings potential hazards:1)MMC will face the risk of“secondary short circuit”if FRT duration is short;2)ac grid may have power angle stability issue if FRT duration is *** avoid these hazards and provide theoretical guidance for the FRT duration setting,transient behaviour of dc fault current during the PTG FRT stage is explored in this ***,challenges of the transient analysis are summarised as non-linearity and high-order *** light of this,numerical and Hilbert-Huang Transformation methods are introduced to evaluate the non-linearity *** is found that the path of MMC from dc current to dc internal voltage is weakly ***,a linear transient model is built to analyse the dc fault *** participation factor analysis,the order of the proposed model is further reduced,so that an analytical expression of the dc fault current is approximately *** on the analytical expression,regularities and mechanism of dc fault current are fully *** of the transient analysis to the setting of FRT duration is elaborated in ***,the PSCAD/EMTDC simulation verifies the validity of the proposed model and analytical expression.

关键词： fault ground setting

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Electrostatic Interference Suppression Method for Magnetic Flux Measurement in the Formation Area of HFRC Device 11th

Electrostatic Interference Suppression Method for Magnetic F...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Zhang, Yujun Chen, Zhipeng Rao, Bo Yang, Yong Li, Zhuolong Zhao, Yanhao Wang, Liye State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819788231

This paper proposes a comprehensive solution to address the interference challenges encountered during magnetic flux loop measurement of flux in Field-Reversed Configuration fusion devices. The high-frequency magnetic field generated by the high voltage discharge coil induces a high voltage in the magnetic flux loop circuit. However, the accompanying electrostatic interference significantly affects the measurement accuracy of magnetic flux. Although traditional isolation, shielding, and grounding techniques can mitigate electrostatic interference to some extent, their implementation is challenging, and they have stringent requirements for the grounding system. In view of this, this study added an electrostatic shielding layer between the magnetic flux loop and the discharge coil. Experimental results show that this measure effectively suppresses electrostatic interference. Simultaneously, this study utilizes a differential measurement method to further reduce electrostatic interference. Experiments show that the flux loop can accurately reflect the flux value, and the correlation coefficient between the measured flux and the theoretical value is 0.935. These improvements not only significantly enhance the accuracy and reliability of magnetic flux measurements but also provide more precise data support for magnetic diagostics research and experiments in Field-Reversed Configuration fusion devices. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Magnetic shielding

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Clustering Optimization Method for Liquid Metal Battery Screening Requirements 11

Clustering Optimization Method for Liquid Metal Battery Scre...

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Zhang, A.E. Kangli Wang, B. Jiang, C. Kai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Hubei Wuhan430074 China

ISBN: (纸本)9788957083505

Liquid metal battery (LMB) exhibits the potential to appear as a cost-effective solution for grid-scale energy storage to improve the stability and flexibility of new power systems. In order to improve the consistency and reliability of liquid metal battery packs, a novel classification method is proposed in this paper. Firstly, a feature vector for battery screening is established from the key influencing factors of battery pack performance. Secondly, the density-based spatial clustering of applications with noise (DBSCAN) algorithm whose input parameters have been optimized by the elbow method is used to detect outliers among sample data. Then, the remaining data are screened by the Mean shift algorithm and the Davies-Bouldin Index (DBI) as the optimized objective. Finally, an experimental of 216 laboratory-made LMBs with the proposed method is presented and the clustering optimization results verify that the proposed method can automatically determine the number of clustering and improve the accuracy of clustering with outlier detection. © 2023 The Korean Institute of Power Electronics.

关键词： Cost effectiveness

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Reduction of Rotor Loss in High-Speed Electrical Machines With a Novel Composite Sleeve 26

Reduction of Rotor Loss in High-Speed Electrical Machines Wi...

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

作者： Ding, Minyue Fang, Haiyang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Enginnering Wuhan China

ISBN: (纸本)9798350317589

The rotor eddy-current loss caused by high frequency current and magnetic field changes is very high in high-speed permanent magnet machines (HSPMM). This is one of the important factors contributing to the overheat of the PMs. Since the sleeve loss is the main component of the overall rotor loss, it is widely concerned in HSPMM. In this paper, a novel composite sleeve is proposed to reduce the rotor loss. The proposed sleeve is applied to a 90kW, 16000r/min PM machine, the total rotor loss and temperature rise are respectively decreased by 44.5% and 18.7% (25.2°C) compared with a conventional carbon fiber sleeve. Furthermore, the rotor maximum stress is obtained and validated to be within the safe range. © 2023 IEEE.

关键词： Carbon fibers

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Inverse Design of electromagnetic Induced Transparency Metamaterials Based on Generative Adversarial Network 4

Inverse Design of Electromagnetic Induced Transparency Metam...

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

作者： Zhou, Xingyu Tian, Peishuai Hu, Yanqi Sun, Qitai Xiong, Yongqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

The unique properties of electromagnetic induced transparency (EIT) metamaterials have caused a lot of concern in the field of terahertz wave regulation, but the traditional design methods of metamaterials have the problems of long design cycle and high trial and error cost. Applying deep learning method to the inverse design process of terahertz metamaterials can greatly reduce the design complexity, so that the EIT metamaterial structure can be quickly designed according to the requirements. In this paper, a generative adversarial network (GAN) model for EIT metamaterial structure design is constructed, which realizes the mapping relationship between target spectrum and metamaterial structure parameters. The proposed GAN model can accurately predict structure parameters of the EIT metamaterial according to the target spectrum, and the error between the generated and the real parameters is less than 1μm. Moreover, by introducing the fuzzy processing, the proposed GAN model can accurately generate multiple sets of metamaterial structure according to the same target spectrum, which provides more options for designers. This model offers a novel and efficient design method for EIT metamaterials. © 2023 IEEE.

关键词： Metamaterials

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Experimental Study on Electrode Erosion Process with High Current Vacuum Arc 19th

Experimental Study on Electrode Erosion Process with High Cu...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Peng, Ruochen Li, Yilong Zhao, Yuan Chen, Lixue Ya, Penglong Lyu, Tianmao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science & Technology Ministry of Education China

ISBN: (纸本)9789819613861

During the breaking process, the erosion of anode contact greatly affects the result of high current vacuum breaking. Therefore, it is important to study the forming and transforming process of anode modes for improving the breaking performance and life of vacuum circuit breaker. The cup axial magnetic field (AMF) contacts is widely used in vacuum trigger switch and vacuum on-load tap changer. In order to study the vacuum arc characteristics and anode mode change of cup AMF contacts under high current density, the 40 mm diameter cup AMF contacts with six slots is observed and studied by experimental means under the gap distance of 6 mm and 10 mm. In this paper, the arc current-voltage characteristics, vacuum arc shape and surface erosion of contact are analyzed. The analysis results show that the larger the contact gap, the larger the arc voltage, the smaller the arc anode mode threshold current and the more serious the contact erosion degree. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Anodes

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Development of Trigger Source for Surface-triggered Vacuum Switch 4

Development of Trigger Source for Surface-triggered Vacuum S...

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

作者： Yao, Yuhui Dai, Ling Wang, Shiqi Lv, Jing Lin, Fuchang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan430074 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: (纸本)9798350305562

This article focuses on the development of a trigger source for a three-electrode flat triggering vacuum switch with a small electrode gap of less than 10mm. The selection and verification of circuit components for the trigger source were conducted, and it was found that the trigger source circuit can output a peak pulse voltage of up to 12.25kV and a rise time of 7.9μs under no-load conditions. Subsequently, the trigger source was connected to the trigger electrode, resulting in a breakdown voltage of approximately 9.5kV at the trigger electrode. Through multiple repeated experiments, it was determined that the trigger source can reliably trigger the trigger electrode at a trigger voltage peak exceeding 9.5kV. © 2023 IEEE.

关键词： Electrodes

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Scan Path Optimization of Discrete Scanning Based on HE-GA in Proton Therapy 4

Scan Path Optimization of Discrete Scanning Based on HE-GA i...

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

作者： Wang, Xinze Tan, Ping Shen, Xinyi Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Scan path optimization in proton therapy requires efficient intelligent optimization algorithms. In this study, we discuss the optimization of the genetic algorithm (GA) for scan path optimization from three aspects: generating initial paths using heuristic algorithms, optimizing the genetic parameters of GA, and incorporating an elite preservation strategy. We propose a heuristic elite-genetic algorithm (HE-GA) and compare it with commonly used simulated annealing (SA) and GA, finding that HE-GA demonstrates higher accuracy, better stability, and faster computation. Using HE-GA under discrete scanning, we analyze tumor cases under different scanning dead times and observe that optimizing the total scanning time by reducing the scanning dead time can lead to improvements. This enables repetitive scanning with the same duration as the zigzag scanning pattern, providing better protection for patients' critical organs. © 2023 IEEE.

关键词： Genetic algorithms

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A Symmetrical-Structure Fault Current Limiter for Bipolar DC Distribution Networks

A Symmetrical-Structure Fault Current Limiter for Bipolar DC...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Chen, Yangfan Zhang, Yu Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Energering Wuhan China

ISBN: (纸本)9798350307832

In a bipolar DC distribution network, both the pole-to-ground fault (PGF) and the pole-to-pole fault (PPF) would threaten its security and stability. This paper proposes a symmetrical-structure fault current limiter (SSFCL) topology, which can help achieve fault riding through (FRT) of PGF and PPF in a bipolar DC distribution network. With the SSFCL, the rising speed of the fault current can be limited, thus ensuring the safety of the DC transformers (DCTs). Then the fault current can be hysteresis controlled within a required range, which provides an adequate fault criterion to locate the faulty load branch. The discharging path of the SSFCL can create a fault current zero point, enabling the solid-state switches to achieve zero-current switching (ZCS) when cleaning the faulty branch. In addition, with the SSFCL, the terminal voltages of the DCTs would not decay during the FRT process, which ensures the fast restoration of the power supply after the fault has been cleaned. The effectiveness of the SSFCL is verified on a ± 375 V bipolar DC experimental prototype. The SSFCL presented in this article provides a solution for the DC fault in a bipolar DC distribution network. © 2023 IEEE.

关键词： DC transformers

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Design of a Dynamic Ridge Filter for Shortening Beam Delivery Time: A Simulation Study 4

Design of a Dynamic Ridge Filter for Shortening Beam Deliver...

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

作者： Yu, Benzhaoxia Liu, Xu Wang, Wei Qin, Bin Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798350305562

Shortening the delivery time for proton therapy can improve the treatment efficiency and efficacy. Energy layer switching time (ELST) is the main contributor to the delivery time. In this study, we design a general dynamic ridge filter (D-RiFi) to broaden the width of the pristine Bragg peak, which can significantly reduce the number of energy layers and the treatment time. By optimizing the shape of D-RiFi, the maximum width of the Bragg peak can be extended to 3.16 cm with a dose flatness of 2.3%. The placement of D-RiFi also influences the beam size and lateral dose uniformity at the isocenter. According to the result of the Monte Carlo simulation, the D-RiFi should be placed 50cm away from the isocenter to satisfy the clinical dose uniformity of 2.5%. Furthermore, the hybrid broadening of the D-RiFi is proposed to reduce the number of energy while reducing the distal falloff width (DFW). The number of energy layers can be reduced by 76.19 % from 21 to 5 with the DFW of 0.54cm, which is conducive to realizing fast proton therapy and some advanced motion-control techniques (e.g., volume repainting, real-time tumor tracking). © 2023 IEEE.

关键词： Proton beams

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