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光伏发电系统输出功率突变引发的逆变器端部过电压机理研究 被引量:6
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作者 段双明 严干贵 +5 位作者 刘彦宇 贾祺 李洪波 朱微 刘侃 乔俊 《中国电机工程学报》 EI CSCD 北大核心 2018年第21期6245-6253,共9页
光伏发电系统输出功率突变会导致逆变器端部瞬间过电压,造成逆变器内部滤波元件过压损坏,危及光伏发电装备的运行安全。目前,关于此类过压问题的机理不清,相关研究鲜有报道。该文针对光伏发电系统输出功率突变导致的逆变器端部过电压问... 光伏发电系统输出功率突变会导致逆变器端部瞬间过电压,造成逆变器内部滤波元件过压损坏,危及光伏发电装备的运行安全。目前,关于此类过压问题的机理不清,相关研究鲜有报道。该文针对光伏发电系统输出功率突变导致的逆变器端部过电压问题,建立包含控制器的逆变器端电压分析模型,揭示由控制器快速响应与端口LC滤波器相互作用而激发的逆变器端部欠阻尼振荡引起的端部过电压机理。基于PSCAD仿真平台和实验平台搭建光伏逆变器联网系统,仿真和实验结果验证所建立模型和理论分析的正确性及有效性。 展开更多
关键词 光伏发电系统 LC型并网逆变器 电压分析模型 功率突变 过电压机理
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牵引电网过电压产生机理及测试研究 被引量:4
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作者 郭艳玲 王洪涤 孙树朴 《电工技术杂志》 2002年第9期25-27,共3页
论述了牵引电网过电压产生的机理,介绍了牵引电网过电压测试系统的设计和测试项目,并根据实测研究,给出了电力机车电力电子装置对过电压能力的要求。
关键词 电力电子装置 供电系统 牵引电网 过电压产生机理 测试
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Recent Advances on Ruthenium-based Electrocatalysts for Lithium-oxygen Batteries
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作者 Yu-Zhe Wang Zhuo-Liang Jiang +2 位作者 Bo Wen Yao-Hui Huang Fu-Jun Li 《电化学(中英文)》 CAS 北大核心 2024年第8期1-16,共16页
Rechargeable lithium-oxygen(Li-O_(2))batteries have attracted wide attention due to their high energy density.However,the sluggish cathode kinetics results in high overvoltage and poor cycling performance.Ruthenium(Ru... Rechargeable lithium-oxygen(Li-O_(2))batteries have attracted wide attention due to their high energy density.However,the sluggish cathode kinetics results in high overvoltage and poor cycling performance.Ruthenium(Ru)-based electrocatalysts have been demonstrated to be promising cathode catalysts to promote oxygen evolution reaction(OER).It facilitates decomposition of lithium peroxide(Li_(2)O_(2))by adjusting Li_(2)O_(2) morphologies,which is due to the strong interaction between Ru-based catalyst and superoxide anion(O_(2))intermediate.In this review,the design strategies of Ru-based electrocatalysts are introduced to enhance their OER catalytic kinetics in Li-O_(2) batteries.Different configurations of Ru-based catalysts,including metal particles(Ru metal and alloys),single-atom catalysts,and Ru-loaded compounds with various substrates(carbon materials,metal oxides/sulfides),have been summarized to regulate the electronic structure and the matrix architecture of the Ru-based electrocatalysts.The structure-property relationship of Ru-based catalysts is discussed for a better understanding of the Li_(2)O_(2) decomposition mechanism at the cathode interface.Finally,the challenges of Ru-based electrocatalysts are proposed for the future development of Li-O_(2) batteries. 展开更多
关键词 Lithium-oxygen battery Ruthenium-based electrocatalyst Reaction mechanism Reaction kinetics OVERVOLTAGE
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