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SSRN 2024年

作者： Ai, Huangze Li, Dong Zuo, Chen Chen, Dezhi State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

A high-power RF negative hydrogen ion source platform has been developed in Huazhong University of Science and technology (HUST). An auto-tuning matching network is utilized to maximize the efficiency of RF power transmission. In order to provide the input impedance information for the auto-tuning system, a real-time impedance measurement device based on the voltage-current detection has been developed. This device employs FFT analysis and correction algorithm of double-spectrum-line interpolation based on rectangular window (DI-RW) to calculate the amplitude and phase of the RF voltage and current sampling signals. Due to the spectrum leakage and low spectrum line utilization of DI-RW, the error of impedance magnitude is around 3%, the error of impedance angle is within 2° in practice. For enhancing impedance analysis accuracy, the triple-spectrum-line interpolation based on Nuttall window (TI-NW) is adopted over the DI-RW, offering faster sidelobe attenuation and improving spectrum utilization. However, the parallel computing for multi-channel signals using TI-NW demands significant hardware resources. To mitigate resource consumption, a serial computation architecture for multi-harmonic analysis based on TI-NW is proposed. Using a signal generator to simulate V-I sampling signals, the test results of the upgraded impedance measurement device have been given, which proves the higher accuracy compared with DI-RW. © 2024, The Authors. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

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Synergetic effects of atmospheric plasma and UVA treatment for eye infection pathogens disinfection

Synergetic effects of atmospheric plasma and UVA treatment f...

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China International Electrical and Energy Conference (CIEEC)

作者： Mengqi Li Yuhan Li Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WuHan PR China

We report a combined method of using atmospheric surface micro-discharge (SMD) with UVA exposure to provide a fast and efficient method against eye infection pathogens. 4 kinds of typical eye infection bacteria were chosen and treated under SMD treatment only, UVA exposure only and 5min SMD treatment followed by 1 or 2 min UVA exposure in buffered solution. The combination of plasma treatment and UVA exposure presented the best antibacterial effect, especially for the UV-resistant bacteria strain, Serratia marcescens. This synergetic method has been found to have no selectivity on bacterium type. The possible mechanism of the synergetic effects was preliminarily proved to be caused mainly by photodecomposition of nitrite. UVA photolysis analysis of pure nitrite, H 2 O 2 solution and their mixture indicated the formation of peroxynitrite in buffered solution partly contributed to the anti-bacterial effect in this work.

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The Interaction Between Active Power and Synchronization Loops of PMSG Within Electromechanical Timescale

The Interaction Between Active Power and Synchronization Loo...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Yayao Zhang Meng Zhan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The interaction between the control links of the permanent magnet synchronous generator (PMSG) is one of the important factors that cause the instability of the PMSG grid-connected system. However, most of the researches on interaction focus on the electromagnetic timescale, and the electromechanical timescale is less involved. This paper analyzes the interaction between the active power loop and the synchronization loop of the PMSG within electromechanical timescale. Firstly, the simplified small-signal model of the PMSG single-machine infinite-bus system within electromechanical timescale is established. Then, the equivalent Heffron-Phillips model of the PMSG is proposed, and the interaction between the active power loop and the synchronization loop is quantitatively analyzed by the damping torque method. It is found that the active power loop can ‘slow down’ the dynamics of the synchronization loop, so that it belongs to electromechanical timescale. These findings provide some new insights into the interaction between the active power loop and the synchronization loop of the PMSG.

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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

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

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International Conference on Electrical Machines and Systems (ICEMS)

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

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%.

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Distribution Dynamic Operating Security Space Characterization for Aggregation and Congestion Capacity Evaluation of Virtual Power Plant

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IEEE Transactions on Smart Grid 2025年

作者： Song, Meng Xu, Zekai Gao, Ciwei Yan, Mingyu Hu, Qinran Southeast University School of Electrical Engineering Nanjing210096 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

Virtual power plant(VPP) can manage distributed energy resources (DERs) to serve the grid, which should satisfy the power flow constraints. However, the distribution system operator(DSO) monopolies system parameters and VPP cannot directly access them. To solve the coordination problem between distribution operation security and VPP management, the distribution dynamic operating security space (DOSS) is proposed to constrain the DER output power for VPP aggregation and congestion capacity evaluation. First, a hybrid fuzzy modeling method based on the distribution system security region is employed to characterize DOSS, and less information exchange between VPP and DSO is required. Data privacy is well respected, and the computational complexity is also reduced. Second, the enhanced opposite direction searching algorithm and the generalized credibility-based piecewise membership crisp method are applied to achieve DOSS's type-reduction and defuzzification for VPP aggregation. This clarifies distribution security risks on VPP through DOSS’s credibility levels. Finally, VPP congestion capacity is proposed to quantify security constraint impacts on the VPP aggregation capacity, which can help coordinate the VPP economic and DSO secure operations. Case studies demonstrate that the proposed methodology can effectively embed the distribution operation security constraints into VPP aggregation and show higher applicability and lower conservativeness than existing approaches. © 2010-2012 IEEE.

关键词： Sensitive data

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Improved Longitudinal Protection for T-connected Inverter Interfaced Distributed Generation Distribution Network

Improved Longitudinal Protection for T-connected Inverter In...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Guan, Shengyuan Qiao, Jian Weng, Wenting Ma, Shaoxiang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665414395

Inverter interfaced distributed generator (IIDG) is connected to the distribution network in the form of T-connected, which changes the operating characteristics of single power flow direction in the traditional distribution network, and makes the traditional three-stage current protection no longer applicable. Therefore, this paper proposes an improved longitudinal protection method for T-connected inverter distributed power distribution networks. The control strategy of IIDG is analyzed, and the analysis method in a distribution network is given. On this basis, an improved criterion of longitudinal protection is proposed. The proposed criterion can sensitively identify internal and external faults that is not affected by DGs. Simulation results of PSCAD verify the effectiveness of the proposed method. © 2021 IEEE.

关键词： Electric load flow

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Protection CT Polarity Checking Method for MMC-HVDC Converter Station Transformer 6

Protection CT Polarity Checking Method for MMC-HVDC Converte...

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6th Asia Conference on Power and Electrical engineering, ACPEE 2021

作者： Liu, Binyan Yin, Xianggen Pan, Yuanlin Wang, Maolin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728191591

Aiming at the difficulty of CT polarity checking of MMC-HVDC converter station transformer, a method for CT polarity checking based on waveform comparison and instantaneous power theory is proposed. The transient current during the process of the converter transformer and the converter valve charging is analyzed, and the polarity of the zero-sequence differential protection and the longitudinal differential protection is checked by comparing the crossing transient current on both sides of the protection based on the longest common subsequence (LCSS) distance. At the same time, the instantaneous active power during the converter valve deblock is used to check the polarity of directional protection. This method can not only check the polarity of longitudinal differential protection and zero-sequence differential protection, but also can check the polarity of directional protection, and the reversed phase of CT can be found out. Moreover, it can withstand a certain degree of ratio error and phase error of CT. The simulation verifies the effectiveness and applicability of the method. © 2021 IEEE.

关键词： HVDC power transmission

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Inertia Provision of DFIG-Based Wind Turbines by Improving the Damping Ratio of PLL

Inertia Provision of DFIG-Based Wind Turbines by Improving t...

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2023 IEEE International Conference on Energy Technologies for Future Grids, ETFG 2023

作者： Zhou, Yini He, Wei Zhu, Donghai Zou, Xudong Wang, Zhikun Hou, Weilin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China State Grid Shandong Electric Power Company Dongying Power Supply Company Dongying China China Electric Power Research Institute Beijing China

ISBN: (纸本)9781665471640

Due to the rapid control of power electronics, it results that the wind turbines (WTs) typified by double-fed induction generator (DFIG) based WTs do not have inertia response capability. Many inertia control methods have been proposed, but they suffer from large structural modifications, high cost, poor adaptability, and slow response. In this regard, this paper first analyzes the inertia response characteristics of DFIG-based WT and further reveals principle of achieving power response of WTs from controlling the phase-locked angle. Then, why the WTs have no inertia response capacity is analyzed when a typical phase-locked loop (PLL) is adopted. Based on this, an inertia response strategy of DFIG-Based WTs by improving the damping ratio of PLL is put forward, and frequency domain response characteristic of it is compared and analyzed with those of typical PLL. Finally, a simulation system of synchronous generator (SG) and an aggregated WT farm is built in MATLAB/Simulink for verification. © 2023 IEEE.

关键词： damp ratio DFIG-based WTs frequency support inertia response PLL

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Experimental study on the influence of H_(2)O vapor and O_(2)for desulfurization and denitrification of the diesel exhaust in marine application by non‐thermal plasma

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High Voltage 2021年第6期6卷 1092-1103页

作者： Yunkai Cai Lin Lv Xinpei Lu School of Energy and Power Engineering Wuhan University of TechnologyWuhanHubeiPeople's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanHubeiPeople's Republic of China

To improve the pollutant removal efficiency by non‐thermal plasma(NTP),the effect of H2O vapor and O_(2)on removal efficiency of NO and SO_(2)as well as the reduction of CO was investigated in H_(2)O/O_(2)/SO_(2)/NO/C_(3)H_(6)/CO_(2)/N_(2)*** analyse the reaction mechanism,the effects of H2O vapor and O2 on the emission intensity of Oð3p^(5)P→3s^(5)S0_(2)Þand OHðA^(2)Σþ→X^(2)ΠÞwere *** experimental results show that the increase of H_(2)O vapour(0%-9.8%)promotes the generation of OH radicals,increases the removal efficiency of NO from 18.9%to 57.3%,decreases the energy per NO removed from 449.0 to 148.1 eV/NO,increases SO_(2)removal efficiency from 4.8%to 35.3%,decreases the energy per SO_(2)removed decreases from 2784.0 to 582.9 eV/SO_(2),and reduces the generation of CO from 460 to 229 *** the range of 0%-15%,the increase of O_(2)content promotes the formation of O radicals,increases the removal efficiency of NO from 8.5%to 54.2%,and decreases the energy per NO removed from 994.3 to 156.4 eV/*** the range of 0%-5%,increasing O_(2)content promotes SO_(2)removal efficiency from 8.7%to 24.8%,and decreases the energy per SO_(2)removed from 2485.7 to 876.6 eV/SO_(2).However,CO generation increases from 200 to 350 ppm with the increase of O_(2)in 0%-5%due to the incomplete oxidation of C_(3)H_(6).In the range of 5%-15%,the increase of O2 produces more O radicals,decreases the removal efficiency of SO_(2)from 24.8%to 23.5%and the generates of CO from 350 to 311 *** study is helpful for improving the efficiency of NTP for desulfurization and denitrification,while reducing the by‐product CO.

关键词： removed thermal vapour

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An Active Gate Driver Design for Dynamic Voltage Balancing in Series-Connected SiC MOSFETs 4

An Active Gate Driver Design for Dynamic Voltage Balancing i...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Cai, Guangyi Lin, Hua Wang, Tao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

With the development of silicon carbide devices, the use of low-voltage Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) in series has become an option in medium/high voltage applications, but it introduces voltage imbalance problem and SiC MOSFETs suffer the great voltage peak stresses as well as the extremely high dv/dts. This brings great challenges to the insulation design of the gate driver circuit. In this study, based on the strategy of adjusting the driving signal time delay, an active gate driver is designed, it can not only reduce the design of sampling isolation through the 'floating ground' but also reduce the requirement for the coupling capacitance of the isolated power supply. Finally, the proposed active gate driver circuit is verified through experiments. © 2021 IEEE.

关键词： Silicon carbide

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