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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Chen, Guilun Ren, Li Li, Xianhao Long, Feiyang Wu, Jiajie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350301571

High-temperature superconducting (HTS) cable may suffer from various types of fault hazards during operation, and lead to the quench, endangering cable safety. The temperature distribution along HTS cable is usually inhomogeneous, which is a direct factor in determining the superconducting performance and operational stability of the cable. However, it is still difficult to achieve effective monitoring of temperature distribution along the cable in actual projects. In this paper, thermal characteristic of concentric HTS cable under various fault scenarios is analyzed, focusing on the temperature distribution of the cable. The results will provide a reference for the study of condition monitoring schemes for the HTS cable. © 2023 IEEE.

关键词： HTS cable temperature distribution thermal characteristic under faults

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An Improved Method for Combining the Power Station Operation Modes Based on the Variation Trend of the Power Source Contribution Coefficient 37th

An Improved Method for Combining the Power Station Operation...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Zou, Yi Ren, Kangjie Li, Yinhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

The combination of operation modes in relay protection setting calculation is the basis to ensure the correct action of the relay protection device. The power source contribution coefficient method combines the power station operation modes in calculating positive-sequence auxiliary increasing coefficient. It has the characteristics of calculating all stations, having a small number of combinations, and possibly requiring iterative calculations in the ring network. Based on this, this paper analyzes the effect of station location on the auxiliary increasing coefficient and discusses the iterative problem in ring networks. An improved method for combining the power station operation modes based on the variation trend of the power source contribution coefficient is proposed. Based on the variation trend, all the power stations with clustering errors are screened out in advance, which will be re-divided into the correct clustering. The auxiliary increasing coefficient can be worked out by setting the same operation mode for the stations in the same clustering group. Simulation case shows that the improved method can realize correct station clustering, avoid multiple iterative calculations, and ensure efficiency. The work was supported by the state Grid Corporation Science and technology Project under Grant 5100-202199558A-0-5-ZN. © 2023, state Grid Electric Power.

关键词： Relay protection

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Ozone Generation by DC Needle-Needle Discharge at Atmospheric Pressure 3

Ozone Generation by DC Needle-Needle Discharge at Atmospheri...

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3rd International Conference on Energy, Power and Electrical engineering, EPEE 2023

作者： Wang, Weiyi Li, Mengqi Wang, Bingkai Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350318180

In this study, the effect of discharge gap and applied voltage on the ozone generation by DC needle-needle discharge was investigated. The relationship between the production efficiency and the energy cost as well as the generation rate were discussed. It has been found that under all experimental conditions, the ozone concentration increased with processing time, but under the same gap distance, the ozone concentration and generation rate initially increased and then decreased with the increase of the applied voltage and injected energy. The energy cost of ozone generation under the discharge power and the total power were calculated and compared. The energy cost basically increased with the applied voltage and power consumption. Therefore, to obtain the optimal parameters for ozone production, both the energy cost and the generation rate should be considered. © 2023 IEEE.

关键词： air plasma energy cost needle-needle discharge ozone generation

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Stability Evaluation of the Dual-terminal Structure DC Distribution Power Systems with Multiple DC Transformers 4

Stability Evaluation of the Dual-terminal Structure DC Distr...

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

作者： Chen, Yangfan Zhao, Mengyuan Zhang, Yu School of Electrical and Electronics Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350305562

To improve the load capability, operating efficiency and power density of the DC distribution power systems (DDPSs), the application of dual-terminal structure (DTS) composed of multiple DC transformers (DCTs) is widely expanding. Focusing on the cascaded stability, the active damping methods for DCTs are widely researched to suppress the oscillation. However, there are few studies discussing whether the DDPS composed of DCTs controlled by active damping methods is still stable. Therefore, this paper firstly builds an impedance model for a DTS DDPS. Then, the stability of a DTS DDPS composed of all-active-damping-controlled DCTs is evaluated based on the Nyquist Criterion. Finally, simulation results show that a DTS DDPS is stable with a high margin when composed of all-active-damping-controlled DCTs, which has fast dynamic speed and good balance ability. © 2023 IEEE.

关键词： DC transformers

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A Two-stage EV Wireless Charging System Based on LCC-S Resonance and Its Wide Input and Output Voltage Range Control Method 26

A Two-stage EV Wireless Charging System Based on LCC-S Reson...

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

作者： Tan, Xiangwen Duan, Shanxu Li, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan China

ISBN: (纸本)9798350317589

With the gradual popularization of electric vehicle (EV), wireless charging has become an important method for EV charging due to its convenience, safety and environmental adaptability. Traditional EV wireless charging systems often adopt a three-stage architecture, resulting in low energy efficiency and high manufacturing costs. This paper presents a two-stage electric vehicle wireless charging system based on LCC-S resonance to realize wireless power transmission with high efficiency and low grid current ripple. The limiting factors of the output voltage range are analyzed, and an output voltage control method combining DC bus voltage regulation and full-bridge phase-shifting is designed. The charging system can satisfy the grid voltage range of S5-265V and vehicle side voltage range of 300-450V, and can tolerate the variation of coupling coefficient. The simulation result shows that the system efficiency is 93% and the current THD can get less than 1%. © 2023 IEEE.

关键词： Electric vehicles

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Plasma-activated hydrogel:fabrication,functionalization,and effective biological model

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Plasma Science and technology 2023年第9期25卷 1-9页

作者：李嘉诚兰存涛聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Wuhan National High Magnetic Field Center Wuhan 430074People’s Republic of China

Hydrogels are biomaterials with 3D networks of hydrophilic *** generation of hydrogels is turning to the development of hydrogels with the help of enabling *** can tailor the hydrogels’properties through simultaneous physical and chemical actions,resulting in an emerging technology of plasma-activated hydrogels(PAH).PAH can be divided into functional PAH and biological tissue model *** review systematically introduces the plasma sources,plasma etching polymer surface,and plasma cross-linking involved in the fabrication of ***‘diffusion-drift-reaction model’is used to study the microscopic physicochemical interaction between plasma and biological tissue PAH ***,the main achievements of PAH,including wound treatment,sterilization,3D tumor model,etc,and their development trends are discussed.

关键词： plasma-activated hydrogel plasma crosslinking biological model

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Single-Pole Fault Injection Directional Pilot Protection for Flexible DC Lines 17th

Single-Pole Fault Injection Directional Pilot Protection for...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Ma, Ruizhi Wen, Minghao Chen, Yu Han, Ke Wang, Xingzhu Han, Xiangyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904075

In the case of single-pole ground fault on the transmission line of MMC-based DC system, the single-ended protection has poor endurance to high-impedance faults, while the double-ended protection performance is limited by the pilot channel. This paper proposed a pilot protection scheme using sound pole active injection of feature signals. Based on the controlled characteristics of hybrid MMC during DC line faults, the DC fault ride-through control strategy is developed considering the requirements of relay protection, using the sound pole commutation valve to actively inject the feature frequency sinusoidal signal into the line during single pole faults, and realizing the fault direction information interaction through the detection of the feature frequency signal to achieve fault discrimination within and outside the DC line. Simulation results show that the protection algorithm proposed in the paper accurately identifies the fault area under the condition of a single pole fault with 500 Ω transition resistance within 10 ms after the fault. The protection scheme does not depend on the pilot channel and line boundary elements and requires low sampling rate. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Poles

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Sensor-data-based Photovoltaic Power Prediction Using Support Vector Machine Optimized by Improved Dragonfly Algorithm

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Sensors and Materials 2024年第8期36卷 3609-3624页

作者： Niu, Jincai Tang, Yu Lin, Hsiung-Cheng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300401 China Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin300130 China Department of Electronic Engineering National Chin-Yi University of Technology Taichung41170 Taiwan

A large-scale integration of photovoltaic (PV) systems can degrade the stability of the power grid. Therefore, it is important to accurately predict the short-term output power generated from PV systems to achieve better grid power distribution and allocation. For this reason, a short-term PV power prediction model that uses the data collected from temperature sensors, irradiance sensors, and other relevant sensors was proposed, in which an improved dragonfly algorithm (IDA) was applied to optimize the support vector machine (SVM). First, the output power curves of PV systems under sunny, cloudy, and rainy conditions were analyzed to determine the input variables of the prediction model, which included temperature, relative humidity, and solar radiation intensity. Second, the original dragonfly algorithm in the optimization process was improved, and then, this IDA was utilized to optimize the parameters of SVM, enhancing the predictive capability of the model. Finally, the IDA-optimized SVM (IDA-SVM) model was applied to predict the PV output power. Test performance results demonstrated that the average absolute percentage errors of IDA-SVM were 2.42, 5.96, and 7.44% for sunny, cloudy, and rainy days, respectively, outperforming other comparative models. The performance results showed that the proposed model can not only improve the stability of PV integration, but also effectively increase the penetration rate of PV energy and enhance the reliability of power system operation. © MYU K.K.

关键词： Prediction models

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Low-carbon Operation of Combined Heat and Power Integrated Plants Based on Solar-assisted Carbon Capture

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1138-1151页

作者： Xusheng Guo Suhua Lou Yaowu Wu Yongcan Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China State Grid Sichuan Electric Power Research Institute Chengdu 610041China

Accelerating the development of renewable energy and reducing CO_(2)emissions have become a general consensus and concerted action of all countries in the world. The electric power industry, especially thermal power industry, is the main source for fossil energy consumption and CO_(2)emissions. Since solvent-based post-combustion carbon capture technology would bring massive extra energy consumption, the application of solar-assisted carbon capture technology has attracted extensive attention. Due to the important role of coal-fired combined heat and power plants for serving residential and industrial heating districts, in this paper, the low-carbon operation benefits of combined heat and power integrated plants based on solar-assisted carbon capture(CHPIP-SACC) are fully evaluated in heat and power integrated energy system with a high proportion of wind power. Based on the selected integration scheme, a linear operation model of CHPIP-SACC is developed considering energy flow characteristics and thermal coupling interaction of its internal modules. From the perspective of system-level operation optimization, the day-ahead economic dispatch problem based on a mix-integer linear programming model is presented to evaluate the low-carbon benefits of CHPIP-SACC during annual operation simulation. The numerical simulations on a modified IEEE 39-bus system demonstrate the effectiveness of CHPIP-SACC for reducing CO_(2)emissions as well as increasing the downward flexibility. The impact of different solar field areas and unit prices of coal on the low-carbon operation benefits of CHPIP-SACC is studied in the section of sensitivity analysis.

关键词： Solar-assisted carbon capture CO_(2)emission reduction combined heat and power integrated plant heat and power integrated energy system wind power

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A Real-Time Junction Temperature Estimating Method for SiC MOSFET Based on the Turn-on Drain-Source Current Oscillation

A Real-Time Junction Temperature Estimating Method for SiC M...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yang, Fengming Liang, Lin Zhang, Ziyang State Key Laboratory of Advanced Electromagnetic Technology Power Electronics and Energy Management Key Laboratory Ministry of Education of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430070 China

ISBN: (纸本)9789819618514

Online junction temperature (Tj) measurement is critical for SiC MOSFET reliability evaluation health management and life prediction. In order to make the tradeoff between availability, simplicity, as well as accuracy, this article demonstrates a real-time junction temperature estimating method by selecting the current oscillation peak of drain source (Ioscpeak) during turn-on transient as a temperature sensitive electrical parameter (TSEP). The theoretical and simulation analysis results show that the Ioscpeak is available to be a TSEP. Then, the model of Ioscpeak and Tj is derived through fitting curve based the experimental results. The voltage and load current dependency of proposed method are also discussed. The experimental results demonstrate that the bus voltage level has a negligible influence to the relationship between the Ioscpeak and the Tj, the value of Ioscpeak is increasing with the increment of current level at the specific temperature. The sensitivity of proposed method has a satisfactory performance of junction temperature estimation. The estimation circuit of proposed method has a simplicity hardware with low cost and easy to be implanted with gate drive of SiC MOSFET. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： MOSFET devices

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