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

作者： Chen, Guilun Ren, Li Xu, Ying 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) cables will suffer from performance degradation at high operating temperatures, and in severe cases even quench. The cryogenic system is able to effectively regulate the temperature distribution of the HTS cable by setting the operating parameters in a reasonable range to ensure its performance. It is therefore necessary to investigate operation strategy for cryogenic system that take the temperature distribution along the cable into account. In this paper, the specific requirements for the safe operation of HTS cable system with regard to the operating parameters of cryogenic system are analyzed. An operation strategy for cryogenic system is proposed to achieve thermally stable operation of HTS cable. © 2023 IEEE.

关键词： cryogenic system High temperature superconducting cable operation strategy temperature distribution

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Multi-point discharge model: study on corona discharge of double-ended needle in large space

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Plasma Science and technology 2023年第3期25卷 62-69页

作者：李丁晨李家玮李传张明王鹏宇刘志杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Digital Grid Research Institute China Southern Power GridGuangzhou 510670People’s Republic of China The Fifth Bureau of China State Construction Engineering Corporation Changsha 410000People’s Republic of China

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However,the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter(25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.

关键词： corona discharge numerical simulation multi-point discharge large space double needle tip electrode

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Thermal Characteristics of Concentric High-Temperature Superconducting Cable under Fault

Thermal Characteristics of Concentric High-Temperature Super...

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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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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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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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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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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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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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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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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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