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DC active power filter based on model predictive control for DC bus overvoltage suppression of accelerator grid power supply

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Plasma Science and technology 2023年第6期25卷 1-13页

作者：张鸿淇朱帮友马少翔李志恒张明潘垣 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

The China Fusion engineering Test Reactor plans to build a 200 k V/25 A acceleration grid power supply(AGPS)for the negative-ion-based neutral beam injector prototype *** AGPS uses a rectifier-inverter-isolated step-up *** is a DC bus between the rectifier and the *** order to limit DC bus voltage ripple and transient fluctuations,a large number of capacitors are used,which degrades the reliability of the power supply and occupies a large amount of *** work finds that due to the difference in the turn-off time of the rectifier and the inverter,the capacitance mainly depends on the rectifier current when the inverter is turned *** this basis,an active power filter(APF)scheme is proposed to absorb the *** enhance the dynamic response ability of the APF,model predictive control is *** this paper,the circuit structure of the APF is introduced,the prediction model is deduced,the corresponding control strategy and signal detection method are proposed,and the simulation and experimental results show that APF can track the transient current of the DC bus and reduce the voltage fluctuation significantly.

关键词： CFETR NBI accelerator grid power supply power active filter model predictive control

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Analysis of Discharge Characteristics and Parameter Influence of Pulsed Power Supply for Electrothermal Chemical Shotguns

Analysis of Discharge Characteristics and Parameter Influenc...

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

作者： Fu, Chenxu Yu, Kexun Xie, Xianfei School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The discharge current waveform of the pulse power supply(PPS) has a direct relationship with the characteristics of the discharge load. The load of the electrothermal chemical cannon is mainly a plasma generator, which involves many complex physical processes in the discharge emission process. However, at present, fixed resistance is generally used to simulate the load for discharge, so it is impossible to accurately study the discharge characteristics of pulsed power supply to electrothermal chemical cannon. Therefore, a 560KJ PPS is initially designed in this paper, and the mathematical model of the pulse power supply and plasma generator load is established. Combined with the internal ballistic model of the electrothermal chemical gun, the model is discretized by the fourth-order Runge-Kutta method, and the corresponding discharge current, discharge output energy and projectile velocity curves are calculated and drawn. Based on the established mathematical model of pulse power supply for electrothermic chemical shotguns, the effects of different parameters of PPS on discharge performance are analyzed, which provides a reference for the optimization of discharge parameters of PPS. © 2024 IEEE.

关键词： Electric discharges

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Adaptive state-of-Charge Control Strategy for Hybrid Energy Storage System Based on Grid-Forming Converter

Adaptive State-of-Charge Control Strategy for Hybrid Energy ...

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

作者： Cui, Bowen Chen, Changsong Gan, Lin Li, Xiayan Zhong, Yuanhao 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

At present, Grid-Forming (GFM) control is recognized as the most promising control technology for grid-connected converters. The energy the GFM converters provide for grid frequency support is mainly sourced from energy storage (ES). Hybrid Energy Storage (HES) systems have the potential to combine the advantages of different types of ES, thereby enhancing the frequency response and inertia emulation capabilities. Nevertheless, ES may encounter state-of-Charge (SOC) limit issues in practice. This paper focuses on the control of the HES system based on GFM converter (GFM-HES). An adaptive SOC control strategy is proposed. On the one hand, closed-loop control of the Supercapacitor terminal voltage is employed to achieve fast SOC recovery. On the other hand, adaptive SOC control for the battery is adopted to prevent it from entering the overcharge and over-discharge zone. The simulation results verify the effectiveness of the proposed control strategy. © 2024 IEEE.

关键词： state of charge

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Control Delay Compensation of Three-Level Synchronous SVPWM Based on Smith Predictor

Control Delay Compensation of Three-Level Synchronous SVPWM ...

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

作者： Wang, Zhengxiao Liu, Kaifeng Ye, Caiyong Liu, Haoqi Wan, Shanming 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

High-speed and high-power motor drive systems are critical for applications such as electric vehicles and industrial automation. These systems often utilize synchronous space vector pulse width modulation (SSVPWM) strategies to optimize performance. However, the multi-mode synchronous SVPWM will bring about a sudden change in the phase angle due to the switching of the number of pulses. This paper proposes a method employing the Smith predictor to correct phase and amplitude errors caused by digital control delays. Compared with the existing methods, this method can respond to phase error more quickly, especially at low carrier ratio, thus improving the stability and performance of the system. © 2024 IEEE.

关键词： Digital control systems

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Enhancing solid-state lithium metal battery performance via indium-based modification of electrolytes and lithium metal surfaces:mechanistic insights and optimization

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Science China Chemistry 2025年第3期68卷 1144-1158页

作者： Zhongkai Wu Chen Liu Ziling Jiang Lin Li Siwu Li Chaochao Wei Qiyue Luo Xia Chen Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China

Argyrodite-based solid-state lithium metal batteries exhibit significant potential as next-generation energy storage ***,their practical applications are constrained by the intrinsic poor stability of argyrodite towards Li metal and exposure to air/***,an indium-involved modification strategy is employed to address these *** optimized doping yields a high Li-ion conductivity of 7.5 mS cm^(-1)for Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte,accompanied by enhanced endurance against air/moisture and bare Li *** retains 92.0%of its original conductivity after exposure to air at a low dew point of-60℃in dry ***,a composite layer comprising Li-In alloy and Li F phases is generated on the surface of lithium metal anode via the reaction between InF_(3)and molten *** layer effectively mitigates Li dendrite growth by creating a physical barrier from the robust LiF phase,while the Li-In alloy induces uniform Li-ion deposition and accelerates Li transport dynamics across the interphase between the solid electrolyte/Li ***,the In-doped electrolyte facilitates the in-situ generation of Li-In alloy within its voids,reducing local current density and further inhibiting lithium dendrite ***,the combination of the Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte and the InF_(3)@Li anode provides exceptional electrochemical performances in both symmetric cells and solid-state lithium metal batteries across different operating ***,the LiNbO_(3)@LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)/Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)/InF_(3)@Li cell delivers a high discharge capacity of 167.8 mAh g^(-1)at 0.5 C under 25℃and retains 80.0%of its initial value after 400 *** work offers a viable strategy for designing functional interfaces with enhanced stability for sulfide-based solid-state lithium batteries.

关键词： Li_(5.5)PS_(4.5)Cl_(1.5)solid electrolyte In_(2)O_(3)dual-doping InF_(3)surface-modification chemical/electrochemical stability electrochemical performance

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Small-Signal Stability Analysis of Parallel Grid-Connected System with Grid-Forming Converter and Grid-Following Converter

Small-Signal Stability Analysis of Parallel Grid-Connected S...

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

作者： Li, Xiayan Chen, Changsong Gan, Lin Bai, Chenxi He, Taihang 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

In order to guarantee the stable operation of new energy sources when connected to the power system through converters, it is of paramount importance to conduct thorough research the small-signal stability of parallel grid-connected system with grid-forming converter (GFM) and grid-following converter (GFL). Initially, the state-space small-signal model of the parallel grid-connected system with GFM and GFL are derived. Subsequently, the impact of the phase-locked loop (PLL) bandwidth, virtual inertia, and reactive power loop integral coefficient on system stability is assessed using the eigenvalue locus method. Moreover, the participation factor analysis method is employed to identify the dominant state variables of the oscillatory mode. Finally, the correctness of the theoretical analysis is validated using PLECS. © 2024 IEEE.

关键词： Eigenvalues and eigenfunctions

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Low-Voltage Ride-Through Method for Grid-Forming Converter Based on Adaptive Virtual Impedance

Low-Voltage Ride-Through Method for Grid-Forming Converter B...

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

作者： Zhong, Yuanhao Chen, Changsong Cui, Bowen Bai, Chenxi He, Taihang School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Due to the good weak grid adaptability and grid support capability, Grid-Forming (GFM) energy storage converter is considered to be an effective solution for the grid-connected interface of new power systems. When a symmetrical low-voltage fault occurring, grid-forming converters may face transient overcurrent problems during the fault and recovery phases. A virtual synchronous generator (VSG)-controlled GFM converter is take as the research object in this paper and a low-voltage ride-through (LVRT) control method of GFM converter is proposed, which realizes the current limitation of GFM converter under low-voltage fault by using adaptive virtual impedance. On the basis of guaranteeing the voltage source characteristics of GFM converter, L VRT control method injects reactive current into the grid according to standards. Finally, based on the Simulink/Matlab simulation platform, the effectiveness of L VRT control method for transient current suppression is verified. © 2024 IEEE.

关键词： Synchronous generators

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Multivariate Evaluation and Enhancement Methods of the Hosting Capacity of Distributed Photovoltaic

Multivariate Evaluation and Enhancement Methods of the Hosti...

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

作者： Liu, Yaowen Sun, Haishun Xu, Suyue 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

Distributed photovoltaic (DPV), represented by household rooftop PV, has been developing rapidly under the promotion of county-wide rooftop PV policy in China. However, its large-scale integration has brought serious challenges to the reliability of the distribution network. It is of great significance to scientifically evaluate the hosting capacity of DPV and provide hosting capacity improvement strategies. By constructing distribution network operational reliability evaluation indexes, the maximum hosting capacity of DPV is evaluated by considering several factors, such as power flow, bus voltage, new energy consumption, etc. The DPV capacity is dispersed evenly to each distribution network bus, which more accurately simulates the dense distribution scenario of household PV and improves the accuracy of the hosting capacity results. A demand response (DR) model based on a two-layer game between load aggregators and distribution network operators is constructed, and the results of the calculation show that the maximum hosting capacity of DPV can be effectively improved based on guaranteeing the maximum interests of both parties. This research provides a scientific basis for the rational planning of the construction scale of DPV. © 2024 IEEE.

关键词： Photovoltaics

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“In-N-out” design enabling high-content triethyl phosphate-based non-flammable and high-conductivity electrolytes for lithium-ion batteries

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Science China Chemistry 2024年第2期67卷 724-731页

作者： Mengchuang Liu Fenfen Ma Zicheng Ge Ziqi Zeng Qiang Wu Hui Yan Yuanke Wu Sheng Lei Yanli Zhu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan430074China GuSu Laboratory of Materials Suzhou215123China Institute of Metal Research Chinese Academy of SciencesShenyang110000China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

Safety issues related to flammable electrolytes in lithium-ion batteries(LIBs) remain a major challenge for their extended *** use of non-flammable phosphate-based electrolytes has proved the validity in inhibiting the combustion of ***,the strong interaction between Li^(+) and phosphate leads to a dominant solid electrolyte interphase(SEI) with limited electronic shielding,resulting in the poor Li^(+) intercalation at the graphite(Gr) anode when using high-phosphate-content *** mitigate this issue and improve Li^(+) insertion,we propose an “In-N-Out” strategy to render phosphates “noncoordinative”.By employing a combination of strongly polar solvents for a “block effect” and weakly polar solvents for a “drag effect”,we reduce the Li^(+)–phosphate *** a result,phosphates remain in the electrolyte phase(“In”),minimizing their impact on the incompatibility with the Gr electrode(“Out”).We have developed a non-flammable electrolyte with high triethyl phosphate(TEP) content(>60 wt.%),demonstrating the excellent ion conductivity(5.94 mS cm^(-1) at 30 ℃) and reversible Li^(+) intercalation at a standard concentration(~1 mol L^(-1)).This approach enables the manipulation of multiple electrolyte functions and holds the promise for the development of safe electrochemical energy storage systems using non-flammable electrolytes.

关键词： lithium-ion batteries graphite anode high-phosphate-content electrolytes non-flammable electrolyte excellent ion conductivity standard concentration

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Simultaneously enhancing erosion and compression resistance:designing AlCoCrFeNi high-entropy alloy strengthened Ag-based contacts

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Rare Metals 2024年第9期43卷 4476-4492页

作者： Xiao-Yang Xue Zhe Wang Hui-Ling Nie Zhao Yuan Jun Wang Chang-Hu Xu Kai Wen Cong-Hao Yu School of Materials Science and Engineering Xi’an Polytechnic UniversityXi’an 710048China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Pulsed Power Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Designing microstructures and unveiling dynamic erosion mechanisms remain important challenges for Ag-based *** simultaneously enhance erosion and compression resistance,an Al Co Cr Fe Ni high-entropy alloy(HEA)is introduced into Ag-based materials to fabricate novel Ag-HEA contacts with island-and skeletonrestricted *** arc erosion experimental results reveal that the skeleton-restricted HEA microstructure is the key factor in reducing the hill and crater morphologies of the contact surface,effectively delaying material transfer between the movable and stationary *** molten bridge evolution and compressive deformation behavior of Ag-HEA contacts with various microstructures are investigated using molecular dynamics(MD)*** results indicate that the constraint of Ag atom diffusion in the molten pool and the involvement of HEA atoms in the molten bridge are the primary mechanisms for improving erosion *** skeleton-restricted HEA microstructure reduces the total energy and structural stability of the molten bridge system and promotes its fracture and ***,the synergistic effect of the twin and Lomerz–Cottrell lock structures can hinder dislocation glide,generating dispersed and small-area stacking faults in the Ag matrix and mitigating the concentration of shear ***,the skeleton-restricted HEA microstructure contributes positively to compression *** study presents a novel approach to designing Ag-based contacts.

关键词： Electrical contact materials High entropy alloys Arc erosion Molecular dynamics Microstructures

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