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International Joint Conference on Energy, Electrical and Power engineering, CoEEPE 2021

作者： Tong, Li Liang, Haiwei Zou, Xudong State Grid Zhejiang Electric Power Research Institute Hangzhou310000 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430070 China

ISBN: (纸本)9789811919213

In order to improve the safety level and economy of distribution grid, a flexible and reconfigurable grid topology is the basic feature of future smart distribution grid. Many advanced functions of intelligent distribution grid, such as state estimation, power flow calculation and voltage control, require a correct grid topology as a prerequisite. Therefore, it is of great significance to find an accurate topology estimation method for distribution grid. This paper proposes a topology estimation method based on the one-dimensional convolutional neural network (1D-CNN). The proposed method firstly obtains the required voltage amplitude and phase angle data of distribution grid through simulation. The data should be standardized after the first step. Then the processed data is used to train the 1D-CNN model. Finally, the trained 1D-CNN model can be used for topology estimation. Compared to the existing methods, the proposed method does not need much historical data of each node in the distribution grid, and the calculation speed can support the online topology estimation. Meanwhile, this method is suitable for radial and weak loop grid structures. The effectiveness and superiority of the proposed method are validated by IEEE 33-node distribution grid. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electric load flow

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Gas breakdown in radio-frequency field within MHz range:a review of the state of the art

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Plasma Science and technology 2022年第12期24卷 200-211页

作者： Wei JIANG Hao WU Zhijiang WANG Lin YI Ya ZHANG School of Physics Huazhong University of Science and TechnologyWuhan 430074People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electronics and Information Engineering Hubei University of Science and TechnologyXianning 437100People's Republic of China Department of Physics Wuhan University of TechnologyWuhan 430070People's Republic of China

Low-temperature plasmas(LTPs) driven by 1-100 MHz radio-frequency(MRF) are essential for many industrial applications,and their breakdown characteristics are different to that of direct current(DC) *** review seeks to understand the state of the art of electric breakdown in the MRF field and provide references for related basic and applied *** have given a brief history of research into MRF-driven breakdown,including Paschen curves,the corresponding discharge modes and parameter spaces,and the evolution of the parameters during the breakdown *** is shown that the focus has been transferred from the breakdown voltage and V-I characteristics to the evolution of plasma parameters during the breakdown,both in experiments and *** is shown that many fundamental and applied problems still need to be investigated,especially with the new global model and the incorporation of the external circuit model.

关键词： gas breakdown RF plasma Paschen curve

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Discussion of Third Harmonic Voltage Characteristics of Large Hydro Generator Stator Winding and Improvement of Ground Protection 1

Discussion of Third Harmonic Voltage Characteristics of Larg...

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2022 1st International Conference on Advances in Modern Physics Sciences and engineering technology, ICPSET 2022

作者： Tan, Liming Wang, Yikai Feng, Xiaosong Zhang, Chunhui Yin, Xianggen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Technology and Research Center Yangtze Power Co. Ltd Yichang443002 China

Large hydro-generators require a 100% protected area for stator ground protection. Because the fundamental voltage criterion has low sensitivity near the neutral point, a high sensitivity third harmonic voltage criterion is needed to ensure that the generator can accurately respond to stator ground fault. This paper analyzes the third harmonic voltage characteristics of two large hydro-generators, calculates the sensitivity of the existing third harmonic criterion, and points out that the impedance parameters of the grounding transformer should be considered. In view of the lack of sensitivity of the third harmonic criterion for large hydro-generators, this paper proposes a stator ground protection criterion based on the third harmonic voltage variation, which has zero action quantity under the generator non-fault conditions and zero braking quantity after a ground fault occurs, and thus has high sensitivity and can effectively respond to high-resistance ground faults. PSCAD/EMTDC simulation results show that the proposed method has high sensitivity at different fault locations and transition resistances, which can provide theoretical support for the improvement of stator grounding protection in practical engineering. © Published under licence by IOP Publishing Ltd.

关键词： Sensitivity analysis

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Multi-Objective Optimization of electromagneticthermal Coupling Performance for High-torquedensity PMSM based on Multi-dimensional Correction Techniques

Multi-Objective Optimization of Electromagneticthermal Coupl...

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International Conference on Electrical Machines, ICEM

作者： Zequan Li Jin Wang Lu Sun Haoyu Kang Liyang Liu Libing Zhou State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Robotics and Autonomous Systems Thrust The Hong Kong University of Science and Technology (Guangzhou) Guangzhou China Robotics and Autonomous Systems Thrust Hong Kong University of Science and Technology (Guangzhou) Guangzhou China

ISBN: (数字)9798350370607

ISBN: (纸本)9798350370614

To address the precision limitation of traditional thermal models and the computational inefficiency of electromagnetic-thermal coupling finite element models, this work proposes a multidimensional correction-based electromagnetic-thermal coupling design optimization method for electric machines. Firstly, this method corrects the sensitive parameters in the analytical lumped parameters thermal network model (LPNM) based on prior information from historical experimental data to ensure the accuracy for thermal performance analysis. Subsequently, to enhance computational efficiency, a large number of low-fidelity (LF) samples are obtained using the corrected thermal model in a serial electromagnetic-thermal field calculation manner, complemented by a small number of high-fidelity (HF) samples obtained from the electromagnetic-thermal coupling simulation model. Then, by employing a transfer learning technique, the data information from the low- to high-fidelity sample sets is comprehensively utilized to train a multi-fidelity (MF) surrogate model for the final optimization. The proposed method applied to a high-torque-density aerospace propulsion permanent magnet synchronous motor (PMSM) with short-term strong overload capability, it not only significantly improves the accuracy of LPNM, but also reduces the training sample acquisition time by over 50% under the same model accuracy. Finally, a prototype is tested to validate the effectiveness of the proposed method.

关键词： Couplings Accuracy Computational modeling Transfer learning Data models Thermal analysis Computational efficiency Iterative methods Optimization Design optimization

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Flexible Scheduling Strategy Based on Situation Awareness technology under Extreme Weather Events

Flexible Scheduling Strategy Based on Situation Awareness Te...

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Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Shuhao Liang Suhua Lou Xun Yao Zheng Lin Xinrui Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Gansu Electric Power Company Lanzhou China

ISBN: (数字)9798350375794

ISBN: (纸本)9798350375800

With the structural morphology evolution of the new power system paradigm, the emergence of random extreme weather events may lead to scenarios of low renewable energy power output and a sharp increase in load demand for a single day or multiple consecutive days, which seriously affect the power supply guarantee of the system. Perceiving the system’s extreme operation scenarios in advance and developing flexible scheduling schemes will help to enhance the system’s resilience. Firstly, based on the framework of the situation awareness technology, this paper proposes a physical-data co-driven model, including the sequential operation optimization model and convolutional neural network model, to explore the mapping relationship between the meteorological perception data and the system’s operation situation labels, realizing the advanced awareness of extreme operation risk scenarios. Secondly, a flexible scheduling strategy with variable balance periods is developed to optimize the system’s unit commitment and energy storage level, improving the system’s overall adaptation resilience and economic benefits. The case study demonstrates the superiority of the proposed model and strategy.

关键词： Economics Adaptation models Renewable energy sources Power supplies Optimization models Data models Robustness

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An Improved Approach Based on Transformer Network for Remaining Useful Life of Lithium-ion Battery 8

An Improved Approach Based on Transformer Network for Remain...

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8th Asia Conference on Power and Electrical engineering, ACPEE 2023

作者： Mao, Jilong Yin, Xin Chen, Rui Ding, Kai Jiang, Lin Lai, Jinmu Yin, Xianggen Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China University of Liverpool The Department of Electrical Engineering and Electronics Liverpool United Kingdom CYG SUNRI CO. LTD. Shenzhen China Zhengzhou University School of Electrical and Information Engineering Zhengzhou China

ISBN: (纸本)9798350345520

In the midst of a growing energy crisis, lithium batteries are attracting attention from various countries. With the massive use of lithium batteries in energy storage systems, accurately predicting the health status of lithium batteries has become a key issue. In battery management systems, predicting battery life is an important part, but it is difficult for current RNN-based neural networks to learn dependencies between distant positions, resulting in reduced accuracy. In this paper, we presented the EMD-Transformer method to achieve accurate prediction of battery life using only a small amount of online battery data. In the data pre-processing process, offline data were added to the dataset. Then EMD was used to extract lifetime degradation trends as well as capacity regeneration information. The Transformer model was used to get prediction results. Finally, a comprehensive SOH prediction result was generated by integrating all the separate results. Using a few battery lifetime data, we demonstrated that the RMSE of the prediction results is within 3%, which owes a higher accuracy than the existing Transformer and LSTM methods. © 2023 IEEE.

关键词： Lithium-ion batteries

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A Digital Processing Method of MSK Signal Based on ADC 3

A Digital Processing Method of MSK Signal Based on ADC

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Lou, Hangchuan Wu, Xianglong Tu, Junyao Long, Gen Liu, Hengyang Kong, Wubin School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Wuhan Maritime Communication Research Institute Wuhan430010 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

A digital processing method of the minimum shift keying (MSK) excitation signal is proposed for cascaded power amplifiers with phase shift control. Through the mathematical characteristics of MSK signal, the frequency extraction of MSK excitation signal and the accurate judgment of code conversion time are realized by Analog-to-digital converter (ADC). To avoid the accumulation of errors in frequency detection, a comparator is used at the beginning of each cycle to calibrate the inverter output signal and MSK excitation signal. Compared with traditional analog method, the proposed method is realized by ADC, which has the advantages of simple structure, high precision, and high waveform reduction Simulation models of digital and analog extraction method are constructed, indicating that the method has the advantages of accurately judging the code conversion time and extracting the frequency. The method can realize the digital processing of MSK signal and generate the control signal of cascaded power amplifiers with phase shift control. © 2022 IEEE.

关键词： Power amplifiers

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Obtaining frequency-time diagram from perturbation signal-time diagram 7

Obtaining frequency-time diagram from perturbation signal-ti...

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7th International Conference on Physics, Mathematics and Statistics, ICPMS 2024

作者： Liu, Xiaoyuan Zhang, Yuxin Dai, Runrui Lai, Zongqiang Qiu, Huibin Shen, Chengshuo Weng, Huang Wu, Shengfa Zheng, Wei Zhang, Wei Liang, Wenxiang Han, Qianhao Li, Xiaobin Liu, Lihuan Shi, Chunhui Xu, Ting Zhang, Haotian Fan, Jiayu Yu, Meiping Tao, Jiajun Jiangxi Province Key Laboratory of Fusion and Information Control Department of Physics Nanchang University Nanchang330031 China NCU-ASIPP Magnetic Confinement Fusion Joint Lab Institute of Fusion Energy and Plasma Application Nanchang University Nanchang330031 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In the field of nuclear fusion energy development, magnetic confinement tokamak reactors, which use strong magnetic fields to confine high-temperature plasmas, are crucial for sustainable and clean fusion energy. Disruption caused by plasma instability can terminate the fusion reaction and even cause irreparable damage to the equipment. Therefore, a thorough understanding of the underlying physical mechanisms is essential for predicting and preventing plasma disruption. The recently proposed analytical theory of plasma disruption may predict and prevent plasma disruption, but its validation requires the frequency-time signals. The Heavy Ion Beam Probe (HIBP) can provide such signals, however, because its scarcity in the world, particularly in China, it is necessary to develop more suitable methods. Here we show a new approach that employs Fast Fourier Transform (FFT) on magnetic perturbation signals to obtain frequency-time diagrams. We successfully applied this algorithm to acquire the frequency-time diagram of the J-TEXT-1054560 discharge. This new method offers an effective tool for validating the plasma disruption theory, overcoming the limitations of traditional techniques and providing a crucial methodological basis for understanding and predicting plasma disruption. This new analytical approach will accelerate the advancement of fusion technology. © Published under licence by IOP Publishing Ltd.

关键词： Heavy ions

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Constructing Br-Doped Li_(10)SnP_(2)S_(12)-Based All-Solid-state Batteries with Superior Performances

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Energy Material Advances 2023年第1期4卷 500-511页

作者： Qiyue Luo Liang Ming Dong Zhang Chaochao Wei Zhongkai Wu Ziling Jiang Chen Liu Shiyu Liu Kecheng Cao Long Zhang Chuang Yu Shijie Cheng State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074P.R.China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074P.R.China School of Physical Science and Technology&Shanghai Key Laboratory of High-resolution Electron Microscopy Shanghai Tech UniversityShanghai 201210P.R.China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074P.R.China College of Physics and Energy Fujian Normal UniversityFuzhou 350117P.R.China

Ionic conductivity and electro/chemical compatibility of Li_(10)SnP_(2)S_(12) electrolytes play crucial roles in achieving superior electrochemical performances of the corresponding solid-state ***,the relatively low Li-ion conductivity and poor stability of Li_(10)SnP_(2)S_(12) toward high-voltage layered oxide cathodes limit its ***,a Br-substituted strategy has been applied to promote Li-ion *** optimal composition of Li_(9.9)SnP_(2)S_(11.9)Br_(0.1) delivers high conductivity up to 6.0 mS cm^(−1).7Li static spin-lattice relaxation(T1)nuclear magnetic resonance(NMR)and density functional theory simulation are combined to unravel the improvement of Li-ion diffusion mechanism for the modified *** mitigate the interfacial stability between the Li_(9.9)SnP_(2)S_(11.9)Br_(0.1) electrolyte and the bare LiNi_(0.7)Co_(0.1)Mn_(0.2)O_(2) cathode,introducing Li_(2)ZrO_(3) coating layer and Li_(3)InCl_(6) isolating layer strategies has been employed to fabricate all-solid-state lithium batteries with excellent electrochemical *** Li_(3)InCl_(6)-LiNi_(0.7)Co_(0.1)Mn_(0.2)O_(2)/Li_(3)InCl_(6)/Li_(9.9)SnP_(2)S_(11.9)Br_(0.1)/Li-In battery delivers much higher discharge capacities and fast capacity degradations at different charge/discharge C rates,while the Li_(2)ZrO_(3)@LiNi_(0.7)Co_(0.1)Mn_(0.2)O_(2)/Li_(9.9)SnP_(2)S_(11.9)Br_(0.1)/Li-In battery shows slightly lower discharge capacities at the same C rates and superior cycling *** characterization methods are conducted to reveal the differences of battery *** poor electrochemical performance of the latter battery configuration is associated with the interfacial instability between the Li_(3)InCl_(6) electrolyte and the Li_(9.9)SnP_(2)S_(11.9)Br_(0.1) *** work offers an effective strategy to constructing Li_(10)SnP_(2)S_(12)-based all-solid-state lithium batteries with high capacities and superior cyclabilities.

关键词： battery electrolyte conductivity

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Study on the Effect of Thermal Degradation on the Morphology Characteristics of Composite Insulator Mandrel Under Vacuum Condition 16th

Study on the Effect of Thermal Degradation on the Morphology...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Cai, Xiang Gao, Chao Zhang, Dandan Lu, Ming Peng, Junzhe Liu, Zehui Pan, Wenwu Wan, Zhiyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9789811918698

the extensive use of composite insulators in the power grid, some insulators have abnormal heating phenomenon, which leads to abnormal fracture of insulators, which seriously threatens the stable operation of the power grid. The composite insulator mandrel is wrapped in a sheath, so it is difficult to contact the air, so it is necessary to study the effect of thermal degradation on the composite insulator mandrel in vacuum. First of all, the vacuum test platform was built independently, and the vacuum thermal degradation experiments of 1 h and 3 h were carried out at 200–600℃ for 5 h. Then, the macro and micro morphologies of the mandrel are studied. The results show that the surface color of the thermally degraded mandrel changes gradually from light green to light yellow, dark brown, brown and black under vacuum conditions, and crack pores appear in the cross section of the mandrel. The critical temperature for crack is 300 ℃, and the critical temperature for pores is 400 ℃. In addition, thermal degradation will lead to the cracking of epoxy resin, resulting in the surface of the mandrel changing from smooth to concave-convex, resulting in a 57-fold increase in the variance of its profile height. At the same time, it will lead to the exposure of glass fiber on the surface of the mandrel, and the degree of exposure can be up to 80%. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Morphology

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