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Ionization process and distinctive characteristic of atmospheric pressure cold plasma jet driven resonantly by microwave pulses

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Plasma Science and technology 2022年第10期24卷 45-53页

作者： Lingli HONG Zhaoquan CHEN Jie YANG Tao CHENG Sile CHEN Yuming ZHOU Bing WANG Xinpei LU Anhui Province Key Laboratory of Power Electronics and Electrical Control Anhui University of TechnologyMaanshan 243032People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

In the present study,a coaxial transmission line resonator is constructed,which is always capable of generating cold microwave plasma jet plumes in ambient air in spite of using argon,nitrogen,or even air,*** the different kinds of working gas induce the different discharge performance,their ionization processes all indicate that the ionization enhancement has taken place twice in each pulsed periods,and the electron densities measured by the method of microwave Rayleigh scattering are higher than the amplitude order of 10^(18)m^(-3).The tail region of plasma jets all contain a large number of active particles,like NO,O,emitted photons,etc,but without O_(3).The formation mechanism and the distinctive characteristics are attributed to the resonance excitation of the locally enhanced electric fields,the ionization wave propulsion,and the temporal and spatial distribution of different particles in the pulsed microwave plasma *** parameters of plasma jet could be modulated by adjusting microwave power,modulation pulse parameters(modulation frequency and duty ratio),gas type and its flow rate,according to the requirements of application scenarios.

关键词： pulsed microwave discharge cold plasma jet transient ionization process ionization enhancement

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A Novel High-Speed Hybrid PMSM and Homopolar Inductor Alternator Used for Double-Frequency Power Generation System 26

A Novel High-Speed Hybrid PMSM and Homopolar Inductor Altern...

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

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

ISBN: (纸本)9798350317589

In some special applications such as shipping and aerospace, the double-frequency generator is needed. The structure of existing double-frequency generator is complex, and the operating rotating speed of the existing double-frequency generator is not so high, which limits the power density of the double-frequency generator. This paper introduces a novel high-speed hybrid permanent magnet synchronous motor (PMSM) and homopolar inductor alternator (HIA) used for double-frequency power generation system. The novel machine combined the PMSM and HIA, and it has the advantages of both HIA and PMSM. The structure and operating principle of it are presented in this paper. The no-load air-gap magnetic field is analyzed in this paper. The coupling of flux between windings of HIA and PMSM is analyzed. And the FEM simulation is done to verify the theory of this paper;the simulation results show that the novel alternator has good performance for double-frequency power generation system. © 2023 IEEE.

关键词： Permanent magnets

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A Novel Flux-Regulation Permanent Magnet Excited HIA with Adjustable Relative Position of Two Halves of Rotor 26

A Novel Flux-Regulation Permanent Magnet Excited HIA with Ad...

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

ISBN: (纸本)9798350317589

The homopolar inductor alternator (HIA) has the advantage of high reliability, power density and energy storage density, which is successfully used in pulsed high power supply, power generator in airborne application, flywheel energy storage system, and propulsion system of ship. Though the copper conductor excited HIA has excellent flux modulation performance, its excitation loss is large. The permanent magnet (PM) excited HIA with mechanical flux modulation can address the problem of excitation loss, but it needs a complex extra flux modulator to change the flux. This paper introduces a novel flux-regulation permanent magnet excited homopolar inductor alternator (HIA) with adjustable relative position of two halves of rotor. The structure and operating principle of it are presented in this paper. The flux modulation is analyzed, and the FEM simulation is done to verify the theory of this paper. The simulation results show that the novel HIA has good flux-regulation performance. © 2023 IEEE.

关键词： Permanent magnets

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Characteristics Evaluation of SiC MOSFET in DC Circuit Breaker

Characteristics Evaluation of SiC MOSFET in DC Circuit Break...

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2024 CPSS and IEEE International Symposium on Energy Storage and Conversion, CPSS and ISESC 2024

作者： Guo, Zhongqi Liang, Lin Wan, Xiangyu Qing, Zhengheng Zhang, Ziyang Yan, Xiaoxue School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Ministry of Education of China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China

ISBN: (纸本)9798350380514

In order to evaluate the characteristics of SiC MOSFET under the mission profile of DC Circuit Breaker (DCCB), a complete DCCB test platform considering the RCD transfer loop and the MOV absorption loop is set up. Based on this platform, single and repetitive short-circuit interrupting experiments are carried out. Through these tests, the characteristics evaluation of 1200V/66A SiC MOSFET under DCCB is tested and analyzed. The aging test results are given. DCCB has its unique mission profile (interruption of large short-circuit current, fast current transfer, etc.), and the characteristics evaluation of SiC MOSFET in DCCB is necessary. For the single tests, the maximum interrupted current is 2.02 times the rated current. For the repetitive tests, the number of interruptions exceeds 2000 times and the interruption boundary is 2004 times under 1.85 times rated current. The failure causes of the devices in two cases are drain thermal failure and gate-source short circuit respectively. After 2000 experiments, the interruption time of DCCB increased significantly, and the Idss, Vgs(th), and Rds(on) of the device increased by about 53.36%, 4.29%, and 16.94% respectively. © 2024 IEEE.

关键词： MOSFET devices

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Special issue on the 70th anniversary of HUST

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Plasma Science and technology 2022年第12期24卷 4-5页

作者： Xiwei HU International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electric and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

Huazhong University of Science and technology (HUST) celebrates its 70th anniversary in *** was transferred to a comprehensive and modern university on the international level in the 1980s from its traditional engineering predecessor,Huazhong Institute of technology,founded in the early 1950s as part of China’s academic institution reorganization.

关键词： anniversary 70t transferred

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Redundant Strategy of T-Type DC/DC MMC Based on Third Harmonic Injection for Submodule Failure

Redundant Strategy of T-Type DC/DC MMC Based on Third Harmon...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Tang, Pengfei Wang, Dan Zhang, Hongyu Fan, Ruoxuan Mao, Chengxiong School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331530174

In this paper, an endogenous AC optimization strategy for T-type topology DC/DC MMC(TDC-MMC) is proposed and applied to the protection strategy for sub-module faults. The endogenous AC model of TDC-MMC is established under the dq coordinate system. Based on this model, two endogenous AC strategies are derived under the conditions of loss minimization and voltage minimization, respectively. The optimization of endogenous AC is achieved by further introducing the third harmonic and redefining the voltage vector relationship under the minimum voltage condition. The optimal amplitude and phase of the third harmonic for each bridge arm are then determined. In a simulation of a 3 kV/1 kV DC transmission system, the working principle of the strategy is verified by applying the protection strategy to the sub-module fault cases of the HV Arm, MV Arm and LV Arm. © 2024 IEEE.

关键词： Harmonic analysis

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Rejuvenating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode directly from battery scraps

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eScience 2023年第2期3卷 112-122页

作者： Yaqing Guo Chi Guo Pengjie Huang Qigao Han Fuhe Wang Hao Zhang Honghao Liu Yuan-Cheng Cao Yonggang Yao Yunhui Huang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of EducationSchool of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056China

Battery recycling is indispensable for alleviating critical material shortages and enabling sustainable battery ***,current methods mostly focus on spent batteries,which not only require sophisticated disassembly and material extraction but also have unknown chemistries and states of health,resulting in high costs and extreme challenges to achieve ***,we propose the direct recycling and effective regeneration of air-degraded LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)cathode directly from battery scraps generated during battery *** NCM523 shows surface degradation only a few nanometers deep and accordingly can be regenerated without adding Li,achieving restored properties(170 mAh g^(-1) at 0.1 C,92.7%retention after 1000 cycles)similar to those of fresh commercial *** analysis shows that scrap recycling has a profit of$1.984 kg^(-1),which is~10 times higher than conventional recycling,making it practical and economical to rejuvenate slightly degraded electrode materials for sustainable battery manufacturing.

关键词： Battery scrap Battery recycling Air degradation Cathode regeneration Techno-economic analysis

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Nonparametric Sliding Mode Predictive Current Control for Linear Induction Motor

Nonparametric Sliding Mode Predictive Current Control for Li...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Guo, Yingcong Xu, Wei Xiao, Han Ge, Jian School of Electrical Engineering Southwest Jiaotong University Chengdu610031 China Institute of Electrical Engineering Key Laboratory of High Density Electromagnetic Power and Systems Chinese Academy of Sciences Beijing100190 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Model predictive control (MPC) enables the linear induction motor (LIM) drive system to maintain good performance despite large distortions in the input voltage waveform, and is particularly suitable for applications with lower converter switching frequencies, such as urban rail transit. However, the parameters of the LIM vary dramatically due to the end effect, which reduces the control performance of the MPC. This paper presents a nonparametric sliding mode predictive current control method to enhance the parametric robustness of MPC. The cost function of nonparametric current control is constructed to overcome the limitation of model predictive control, which is greatly affected by parameter accuracy. The simulation results show that the proposed method can maintain the good control performance of the LIM drive system under the condition of inaccurate parameters, effectively improve the robustness of the system, and has certain engineering significance. © 2024 IEEE.

关键词： Cost functions

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Design of a new low power protection method for pumped storage synchronous motor 9

Design of a new low power protection method for pumped stora...

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9th International Conference on Energy Materials and Electrical engineering, ICEMEE 2023

作者： Qiao, Jian He, Rufei Yin, Xianggen Ma, Yiming Lu, Qinghui Peng, Yumin Wang, Wenhui Zhang, Hao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China CSG PGC Power Storage Research Institute Guangzhou510950 China

ISBN: (纸本)9781510672765

In this paper, the characteristics of power oscillation of pumped storage synchronous motor under pumped condition are studied, and the causes of misoperation of conventional low power protection are analyzed. Based on digital simulation and actual data analysis, a multi-stage low power protection is proposed. The power setting value of each section matches the delay setting value, which can adapt to the characteristics of motor power oscillation and effectively solve the misoperation problem of conventional low power protection. The simulation results show that its performance is stable and reliable, and the problem of misoperation of conventional low power protection is solved. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Failure analysis engineering Silver Analytical research Design and modelling Reliability Frequency modulation Phase modulation Safety Power grids

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Research on bundling optimization of wind-solar-hydro based on wind-solar cluster convergence

Research on bundling optimization of wind-solar-hydro based ...

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2024 International Conference on Smart Grid and Artificial Intelligence, SGAI 2024

作者： Zhao, Yuanyuan Wu, Yaowu Yao, Xun Lou, Suhua Yang, Xiaojuan Liu, Peiyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430070 China State Grid Gansu Electric Power Company Gansu Lanzhou730000 China

To solve the problem of cooperative dispatching of wind-solar power stations and cascade hydropower stations along the coast of the basin, an optimization method of bundling of wind-solar-hydro (WSH) in the basin based on the convergence of wind-solar (WS) clusters is proposed. This method takes into account the spatial distribution characteristics and output characteristics of WS-power stations in the basin and constructs the cluster division strategy based on the geographical location distribution peculiarity of power stations and the cluster convergence criterion based on the complementary properties of wind and solar. To optimize the load-matching characteristics of the output of the WSH system, based on the hydraulic coupling characteristics of upstream and downstream cascade hydropower stations, an optimization model of cascade wind-solar-hydro bundling is constructed. Taking the data of wind, solar, and hydro stations in a river basin as an example, the results show that the method proposed in this paper is suitable for solving the problem of gradual bundling of wind-solar-hydro in the basin. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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