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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Liu, Zhijian Guo, Cheng Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819713509

This article proposes a capacitor charging pulse power supply based on a permanent magnet excitation homopolar inductor generator (HIG). Compared with ordinary HIG, it does not require an external excitation power supply, and has the advantages of a simpler system and no excitation loss in the motor. And a mechanical magnetic adjustment method was adopted to reduce iron loss during no-load operation. The average value analysis model of the power supply system was analyzed, and it was pointed out that the difference between the permanent magnet excitation induction motor and the ordinary induction motor model lies in the different values of the equivalent internal inductance. The equivalent inductance of the permanent magnet excitation HIG is related to the dq axis inductance value, while the equivalent inductance of the ordinary HIG is related to the transient dq axis inductance value. The correctness of the average-value model was verified through finite element simulation, and the effectiveness of the magnetic adjustment ring was verified, which can significantly reduce the no-load iron loss of the motor. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Permanent magnets

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Active Damping of DC Transformer with ISOP Structure Based on Impedance Reshaping

Active Damping of DC Transformer with ISOP Structure Based o...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 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)9798350316445

The DC transformers (DCTs) constructed by input-series-output-parallel (ISOP) structure with dual active bridge (DAB) submodules (SMs) would face the risk of instability due to the equivalent inductance of input power line, which are neglected in most existing research. This work evaluates the stability characteristics of DCTs and proposes an active damping method for DCTs to ensure the stability. First, the input impedance of DCT is derived. Then, the stability characteristics of DCT are analyzed based on Nyquist Criterion. Next, an impedance reshaping control scheme (IRCS) for DCT is proposed to reshape the input impedance of DCT to achieve stabilization, which is easy to be implemented and no additional sensors are needed. Finally, the relevant experiments validate the performance of IRCS. © 2023 IEEE.

关键词： Cascaded stability DC transformers Dual active bridge Impedance reshaping Input-series-output-parallel

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Operation Optimization of Combined Wind Storage System Based on Electrochemical Energy Storage Life 5

Operation Optimization of Combined Wind Storage System Based...

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5th International Conference on Advances in Electrical engineering and Computer Applications, AEECA 2024

作者： Yang, Tianmeng Liu, Jicheng Feng, Wei Chen, Zelong Liu, Peiyu Northeast Branch of State Grid Corporation of China Power Grid Technology Center Shenyang China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350355253

To mitigate the intermittency and volatility of large-scale wind farms and alleviate their impacts on traditional fossil fuel-based power units, this paper proposes an integrated wind-storage system based on the operational cost of the power system. This system incorporates large-scale wind power generation and considers diverse service life models as well as the capacity of the electrochemical energy storage. Employing a multi-objective optimization algorithm, this study optimizes the output scheduling of both the electrochemical energy storage and the pumped-hydro energy storage system, ensuring the full integration of wind power into the grid while compensating for deviations in wind power output. The objective is to minimize the operational cost of the power system and reduce the equivalent load fluctuations after the integration of the combined wind-storage system into the grid. Simulation experiments demonstrate the feasibility and rationality of the proposed integrated wind-storage system. © 2024 IEEE.

关键词： Wind power integration

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Analysis of electromagnetic Performance of an AUV Wireless Charge Device with New Coil Structure 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Zhang, Ming Rao, Bo Liu, Zhijian Guo, Cheng Yu, Zhongming Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819713516

ISBN: (纸本)9789819713509

This paper proposed a an AUV Wireless Charge Device With New Coil Structure, including transmitting coil, receiving coil, and the magnetic core used for magnetic field shielding. The transmitting coil is arc-shaped coil, with 60° radian, and it is arranged by six identical coils along the circumference, and the identical coils are connected in series. The receiving coil is also arc-shaped coil, with 120° radian, and it is arranged by three identical coils along the circumference, and the identical coils are connected in series or parallel. The new-structure coil has the advantage that the inductances of transmitting coil and receiving coil is almost constant, and it is especially suitable for AUV wireless charging devices. And it can solve the problem of the coupling coefficient of traditional AUV wireless charging devices changing with the AUV roll angle. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Inductance

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Coordinated Optimization of Multi-energy Generation Systems Considering the Health Damages of Coal-fired Pollutant Dispersion

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1613-1622页

作者： Suhua Lou Yinhao Yang Yanjie Liang Yaowu Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Power Dispatch and Control Center of China Southern Power Grid Guangzhou 510623China

Pollutants emitted from coal-fired power plants lead to the deterioration of air quality in developing countries,and contribute to both mortality and *** improve air quality from power generation,new dispatch strategies incorporated with air pollution dispersion models should be *** paper takes into account the impact of meteorological variations on spatio-temporal dispersion of *** on the coal-fired pollutant concentration estimated by the Gaussian plume dispersion model,exposure-response functions are used to quantify the resulting health ***,the corresponding economic costs of health damages are incorporated to penalize the power *** generation costs and economic costs of health damages,this paper formulates a twostage stochastic optimization model of a multi-energy generation system including coal units,gas units,and photovoltaic ***,numerical studies based on a modified IEEE 14-node system are performed for illustration and validation.

关键词： Coal-fired pollutant dispersion exposure-response functions Gaussian plume model meteorological variations multi-energy generation system

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Inverse design of electromagnetically induced transparency (EIT) metamaterials based on autoencoder with reconstruction error 4

Inverse design of electromagnetically induced transparency (...

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

作者： Tian, Peishuai Zhou, Xingyu Hu, Yanqi 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

In the paper, we design a new deep learning (DL) network to analysis and design the electromagnetically induced transparency (EIT) metamaterials. The network is divided into two parts: dimensionality reduction reconstruction network and inverse design. The dimensionality reduction reconstruction network mainly deals with high-dimensional input data. In the inverse design, we combine the convolutional neural network (CNN) and long short-term memory (LSTM) to predict the EIT metamaterial structure. The inverse design has reduced the mean square errors (MSE) on the validation set to 0.0032 and predict the structure parameters within the error of 0.26 μm, which are better than other reports. Besides, we avoid the overfitting problem and one-to-many problem to some extent. By comparing the spectra of real and predicted parameters on the validation set, we are confident that the network will pave a new path for designing EIT metamaterials. © 2023 IEEE.

关键词： Metamaterials

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

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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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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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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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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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