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Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

Plasma Science and technology 2023年第4期25卷 101-110页

作者：李丁晨李传李家玮杨文迪肖梦涵张明于克训 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

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources,which largely determines the overall discharge effect,has still not been studied *** this work,a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge ***,the effects of the number of electrodes,voltage level,and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an *** calculation results show that,when multiple discharge electrodes operate simultaneously,the superimposed electric field includes multiple components from the electrodes,making the ion distribution and current different from that under a single-blade *** larger the distance between discharge electrodes,the weaker the *** the electrode spacing d is larger than 4 cm,the interaction can be *** results can guide the design of large discharge gap array electrodes to achieve efficient discharge.

关键词： non-equilibrium plasma corona discharge double-blade electrode interaction numerical simulation

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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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Intelligent Predetermination of Generator Tripping Scheme: Knowledge Fusion-based Deep Reinforcement Learning Framework

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 66-75页

作者： Lingkang Zeng Wei Yao Ze Hu Hang Shuai Zhouping Li Jinyu Wen Shijie Cheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics EngineeringHuazhong University of Science and TechnologyWuhan 430074China Dispatching and Control Center Central China Branch of State Grid Corporation of ChinaWuhan 430077China. Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996USA

Generator tripping scheme(GTS)is the most commonly used scheme to prevent power systems from losing safety and ***,GTS is composed of offline predetermination and real-time scenario ***,it is extremely time-consuming and labor-intensive for manual predetermination for a large-scale modern power *** improve efficiency of predetermination,this paper proposes a framework of knowledge fusion-based deep reinforcement learning(KF-DRL)for intelligent predetermination of ***,the Markov Decision Process(MDP)for GTS problem is formulated based on transient instability ***,linear action space is developed to reduce dimensionality of action space for multiple controllable ***,KF-DRL leverages domain knowledge about GTS to mask invalid actions during the decision-making *** can enhance the efficiency and learning ***,the graph convolutional network(GCN)is introduced to the policy network for enhanced learning *** simulation results obtained on New England power system demonstrate superiority of the proposed KF-DRL framework for GTS over the purely data-driven DRL method.

关键词： Deep reinforcement learning generator tripping scheme graph convolutional network invalid action masking knowledgefusion

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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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Challenges and strategies of formulating low-temperature electrolytes in lithium-ion batteries

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Interdisciplinary Materials 2023年第2期2卷 308-336页

作者： Mingsheng Qin Ziqi Zeng Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Lithium-ion batteries(LIBs)have monopolized energy storage markets in modern *** reliable operation of LIBs at cold condition(<0°C),nevertheless,is inevitably hampered by the sluggish kinetics and parasite reactions,which falls behind the increasing demands for portable electronics and electric *** electrolyte controls both Li+transport and interfacial reaction,dictating the low-temperature performance ***,the rational formulation of electrolytes is significant for realizing superior lowtemperature performance and broadening application niches of ***,we first discuss the kinetic limitations of low-temperature LIBs,highlighting the importance of electrolyte structure and interfacial ***,the advancements for formulating subzero-temperature electrolyte are summarized with in-depth discussions about electrolyte formulation,solvation structure,interfacial chemistry,and low-temperature ***,some opportunities for lithium metal batteries and the corresponding lowtemperature electrolyte are ***,the major challenges and future perspectives are outlined for low-temperature LIBs.

关键词： electrolyte lithium-ion batteries low temperatures solvation structures

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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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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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Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Converter Through Dual-Path Zero-state 10

Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Conver...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Zhao, Mengyuan Zhang, Yu Chen, Yangfan Li, Zhuolan University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Huazhong Wuhan China

ISBN: (纸本)9798350351330

The active-neutral-point-clamped three-level dual active bridge (ANPC-DAB) converter is a prominent topology for medium voltage applications. To realize high cost-efficiency, the hybrid utilization of Si and SiC devices has been an attractive approach. In this paper, a 2-SiC hybrid devices ANPC-DAB converter is studied, which optimally utilizes both Si IGBTs and SiC MOSFETs to achieve the tradeoff between performance and cost. A modulation strategy through dual-path zero-state (DPZS) is proposed to achieve zero-voltage switching (ZVS) turn-on of all switches when combining proper current conditions and optimally balance the switching losses among the switches. Meanwhile, the presented method achieves small dead zones and short commutation loops during switching process. Finally, the experimental results are given to verify the effectiveness of the modulation strategy. © 2024 IEEE.

关键词： Silicon carbide

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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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