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Selection Method for New Energy Output Guaranteed Rates Considering Optimal Energy Storage Configuration

CSEE Journal of Power and Energy Systems 2024年第2期10卷 539-547页

作者： Xin Cheng Tong Wu Wei Yao Yan Yang Guangdong Power Grid Corporation Guangzhou 510620China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The output of new energy represented by wind power and photovoltaic power features volatility and randomness. It is a practical approach to use the guaranteed rate with statistical characteristics to analyze the output coefficient of new energy. However, there is a lack of analysis and demonstration on the value of the new energy output guaranteed rate. To solve this problem, a selection method for the new energy output guaranteed rate considering optimal energy storage configuration is proposed. First, the influence of the new energy output guaranteed rate on the new energy output coefficient is analyzed. Secondly, with the goal of minimizing the comprehensive costs, an optimal configuration model of energy storage based on the output guaranteed rate of new energy is constructed, and particle swarm optimization is used for the optimization solution. Then, according to the optimal energy storage configuration results under different guaranteed rates, a reasonable new energy output guaranteed rate is determined by maximizing the comprehensive benefits obtained from energy storage. Finally, an example applied to the power grid in an area of Guangdong in Southern China is provided to illustrate the effectiveness of the proposed method.

关键词： Energystorage optimization guaranteed output guaranteed rate new energy consumption

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Observation of Hot Electrons in Surface-Wave Plasmas Excited by Surface Plasmon Polaritons

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Chinese Physics Letters 2011年第11期28卷 162-165页

作者： HU Ye-Lin CHEN Zhao-Quan LIU Ming-Hai HONG Ling-Li LI Ping ZHENG Xiao-Liang XIA Guang-Qing HU Xi-Wei College of Electrical and Information Engineering Anhui University of Science and TechnologyHuainan 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074 State Key Laboratory of Structure Analysis for Industrical Equipment Dalian University of TechnologyDalian 116024

The electron energy distribution functions(EEDFs)are studied in the planar-type surface-wave plasma(SWP)caused by resonant excitation of surface plasmon polaritons(SPPs)using a single cylindrical *** plasma characteristics can be considered as a bi-Maxwellian EEDF,which correspond to a superposition of the bulk low-temperature electron and the high-energy electron beam-like *** beam component energy is pronounced at about 10 eV but the bulk part is lower than 3.5 *** hot electrons included in the proposed plasmas play a significant role in plasma heating and further affect the discharge chemistry.

关键词： beam Electron resonant

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Facile synthesis of Li2S@C composites as cathode for Li–S batteries

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Journal of Energy Chemistry 2019年第10期28卷 111-116页

作者： Xin Chen Linfeng Peng Lixia Yuan Rui Zeng Jingwei Xiang Weilun Chen Kai Yuan Jie Chen Yunhui Huang Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Lithium sulfide (Li2S) provides a promising route for lithium storage due to high theoretical specific capacity (1166 mAh g-1). The electrochemical performance of Li2S can be significantly enhanced by forming Li2S-carbon composites with the introduction of carbon. However, the complex synthesis method of Li2S-carbon composites restrains the large-scale productivity. Herein, we propose a facile route to prepare carbon coated Li2S-carbon nanotube composites (Li2S@C-CNT) via spray drying and heat treatment, which is a low-cost and large-scale method for facile synthesis of Li2S-carbon composites. For the Li2S@C-CNT composites, Li2S nanoparticles are contacted with surrounding particles due to the 3D CNTs framework. The novel construction not only suppresses the diffusion of polysulfides during cycling, but also remarkably accelerates the transport of electron and ion, resulting in a high specific capacity (1100 mAh g^-1) and good cycling performance. The rational designed architecture and good electrochemical performance of Li2S@C-CNT will pave the avenue for realizing high energy density of Li2S-based batteries.

关键词： Spray drying Li2S@C-CNT Lithium-sulfur batteries

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Design of an electron gun for terahertz radiation source

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Chinese Physics C 2014年第4期38卷 93-97页

作者：李骥裴元吉胡桐宁陈曲珊冯光耀尚雷李成龙 National Synchrotron Radiation Laboratory University of Science and Technology of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Deutsches Elektronen-Synchrotron

An EC-ITC （External-Cathode Independently Tunable Cells） RF gun was employed with the aim of obtaining short-pulse bunches with high peak current for a terahertz radiation source. A gridded DC gun plays a key role as the external injecting electron source of the ITC RF gun, the performance of which determines the beam quality in the injector and transport line. In order to make the beam well compressed in the ITC RF gun, the energy of the electrons acquired from the gridded DC gun should be 15 keV at most. A proper structure of the gridded gun with double-anode is shown to overcome the strong space- charge force on the cathode, which is able to generate 6 μs beam with 4.5 A current successfully.

关键词： gridded DC gun RF gun EC-ITC

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Numerical Simulation on the Production Mechanism of Surface-Wave Plasmas Sustained along a Metal Rod

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Chinese Physics Letters 2014年第3期31卷 103-106页

作者： ZHU Long-Ji CHEN Zhao-Quan YIN Zhi-Xiang WANG Guo-Dong XIA Guang-Qing HU Ye-Lin ZHENG Xiao-Liang ZHOU Meng-Ran CHEN Ming LIU Ming-Hai College of Electrical and Information Engineering Anhui University of Science and Technology Huainan 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024

For interpreting the production mechanism of surface-wave plasmas sustained along a metal rod, electromagnetic simulation on the electromagnetic field distributions and particle-in-cell/Monte Carlo collision （PIC/MCC） simulation of the ionization process are present. The results show that the enhanced electric field of surface plasmon polaritons （SPPs） can be excited in the ion sheath layer between the negative-voltage metal rod and the surface-wave plasmas, which is responsible for maintaining the plasma discharge. Moreover, the spatio-temporal evolutions of plasma density and electric fields are simulated by the PIC/MCC model. It is further suggested that the expanded ion sheath layer can extend the length of plasma domain by increasing the plasma absorbed energy from SPPs.

关键词： SURFACE waves (Fluids) RESEARCH PLASMA (Ionized gases) -- Research ELECTROMAGNETISM electromagnetic theory PHYSICS research

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Error field penetration in J-TEXT tokamak based on two-fluid drift-MHD model

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Chinese Physics B 2024年第4期33卷 545-551页

作者：王文徐涛张仪 the J-TEXT team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

An externally generated resonant magnetic perturbation can induce complex non-ideal MHD responses in their resonant *** have studied the plasma responses using Fitzpatrick's improved two-fluid model and program *** calculated the error field penetration threshold for *** addition,we find that the island width increases slightly as the error field amplitude increases when the error field amplitude is below the critical penetration ***,the island width suddenly jumps to a large value because the shielding effect of the plasma against the error field disappears after the *** scanning the natural mode frequency,we find that the shielding effect of the plasma decreases as the natural mode frequency ***,we obtain the m/n=2/1 penetration threshold scaling on density and temperature.

关键词： plasma responses drift-MHD model error field penetration

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Inertial PLL of Grid-connected Converter for Fast Frequency Support

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1594-1599页

作者： Xiang Guo Donghai Zhu Jiabing Hu Xudong Zou Yong Kang Josep M.Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China. Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

Frequency support capability for the grid-connected converter(GCC)is one of the basic safeguards for the stability of renewables-dominated power *** this paper,analogous to the motion equation of a synchronous generator(SG),an inertial phase-locked loop(iPLL)is proposed for GCC to achieve fast frequency *** iPLL introduces the inertial and damping loops into the classic PLL structure to emulate the natural frequency regulation characteristics of a *** with the existing methods,the iPLL has a faster frequency response and is simpler in design and ***,the proposed iPLL method is validated by *** Terms-Frequency support,grid-connected converter,inertial phase-locked loop(iPLL),synchronous generation(SG).

关键词： Frequency support grid-connected converter inertial phase-locked loop(iPLL) synchronous generation(SG).

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Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF

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Nuclear Science and Techniques 2023年第8期34卷 75-85页

作者： Ji-Qing Li Kuan-Jun Fan Zheng-Zheng Liu Jian Wang Qu-Shan Chen Jin-Feng Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China The Institute of Scientific and Industrial Research Osaka University8-1 MihogaokaIbarakiOsaka 567-0047Japan

To guarantee the exact proton dose applied to patients and ensure treatment safety while disrupting and destroying tumor cells,it is essential to accurately monitor the proton beam current in real time during patient *** clinical treatment requires a proton beam current in the∼nA range,nondestructive beam current monitors(BCMs)are preferred to minimize the degradation of beam ***,this poses significant challenges in accurately monitoring such extremely low beam *** study proposes a cavity-type BCM equipped with a dielectric plate to reduce its dimensions and achieve sufficient measurement sensitivity for practical requirements.A prototype cavity BCM was fabricated,and off-line testing was performed using a metal wire to simulate the beam to study its *** the simulation and experi-mental results showed that the cavity BCM could measure ultralow proton beam currents with a resolution up to 0.03 nA.

关键词： Proton therapy Beam current Cavity BCM Nondestructive

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Pole-to-ground Fault Analysis for HVDC Grid Based on Common-and Differential-mode Transformation

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Journal of Modern Power Systems and Clean Energy 2020年第3期8卷 521-530页

作者： Zhen He Jiabing Hu Lei Lin Yuanzhu Chang Zhiyuan He State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Global Energy Interconnection Research Institute State GridBeijing 100192China

Pole-to-ground(PTG) fault analysis is of vital importance for high-voltage direct current(HVDC) grid. However, many factors are not considered in the existing studies such as the asymmetrical property of PTG fault, the coupling issue between DC transmission lines and the complexity of the structure of DC grid. This paper presents a PTG fault analysis method, which is based on common-and differential-mode(CDM)transformation. Similar to the symmetrical component method in AC system, the transformation decomposes the HVDC grid into CDM networks, which is balanced and decoupled. Then, a transfer impedance is defined and calculated based on the impedance matrices of the CDM networks. With the transfer impedance, analytical expressions of fault characteristics that vary with space and time are obtained. The proposed PTG fault analysis method is applicable to arbitrary HVDC grid topologies,and provides a new perspective to understand the fault mechanism. Moreover, the analytical expressions offer theoretical guidance for PTG fault protection. The validity of the proposed PTG fault analysis method is verified in comparison with the simulation results in PSCAD/EMTDC.

关键词： High-voltage direct current(HVDC)grid pole-to-ground(PTG)fault common-and differential-mode(CDM)transformation DC ciruit breaker(DCCB)

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Phase–amplitude model for doubly fed induction generators

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 369-379页

作者： Hua HUANG Ping JU Xueping PAN Yuqing JIN Xiaoming YUAN Yuan GAO State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China

The doubly fed induction generator(DFIG) is major type of wind turbine generator used in grid-connected wind farms. Practical models of DFIG have been built to study the influence of wind power generation on power system dynamics. However, most existing practical models of the DFIG are based on rectangular coordinates,in which frequency variation is neglected. In this paper, a phase-amplitude(P-A) model is proposed for a DFIG based on phase and amplitude of the internal voltage. The model structure is much like that of the synchronous generator, and the rotor voltage can manipulate both the amplitude and the phase of the internal *** have been made between the new P-A model of the DFIG and the synchronous generator model,as well as the asynchronous motor *** contributions of the new P-A model of the DFIG are discussed and it is demonstrated that the proposed model has better ability in describing power system dynamic phenomena such as voltage dynamics and structural dynamics. Simulation results and a field test validate these contributions.

关键词： Doubly fed induction generator(DFIG) Model Internal voltage Voltage dynamics Frequency dynamics

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