Results 51 to 60 of about 14,197 (189)
Gaoya dianqi, 2018 整流侧采用电网换相型换流器（line commutated converter,LCC）,逆变侧采用模块化多电平换流器（modular multilevel converter,MMC）的混合型直流输电系统,结合LCC和MMC的优点,尤其适用于特高压直流输电应用场合。为了确保正常状态和故障状态下的稳定运行,文中针对混合型直流输电系统的控制策略进行研究。文中首先针对一个LCC整流站,两个MMC逆变站构成的三端混合直流系统,介绍了数学模型和整个直流系统的基本控制策略。然后针对基本控制策略下 ...
陈凌云 +6 more
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Gaoya dianqi, 2020 为了缓解风电因随机波动性对电网造成的冲击,增强风电的可控性,提出一种基于分频段补偿法的风水储微电网优化调度策略。该策略根据水电机组输出带宽,通过小波分解法对风电功率信号进行多尺度分解,得到水电机组和储能系统初级功率指令,再根据水机爬坡能力,对初级功率指令进行修正得到最终功率指令。基于MATLAB/Simulink平台建立了风水储微电网仿真模型,分析了所提调度策略与现有策略的控制效果,结果表明,所提调度策略能减小储能所需容量,降低储能配置成本;改善了微网内水机过渡过程,有利于微网稳定运行 ...
王源, 南海鹏, 关欣
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Vocabulary Strategy Instruction in the Argentine EFL Context: Teachers’ Perspectives and Practices
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite extensive research on vocabulary strategy instruction (VSI), little has been known about teachers’ perspectives on how it is understood and implemented in practice. This study investigated Argentinian EFL teachers’ priorities in vocabulary instruction, their perceived knowledge of learner strategies for spoken vocabulary, and factors ...
Isobel Kai‐Hui Wang, Andrew D. Cohen
wiley +1 more source
Dianci bileiqi自电气化铁道建设以来，铁路运营受到雷害的影响最为严重，也是现如今一直未解决的难题。为了减少电气设备遭受雷击而导致设备的故障率和保障铁路运输的安全可靠性，早期已有研究者针对日本电气化铁道电气设备遭雷害进行了研究并制定相应的防雷对策。同时，防雷方面的研究一直受到诸多国家铁路运营部门的高度重视。但随着接触网结构的变化、钢管柱逐渐替代混凝土支柱、供变电及信号设备的电子化等电气设备技术的革新，以及雷电观测技术持续更新和雷击过电压仿真程序的高度精细化，雷害对策也需进行完善。因此 ...
何德鹏
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Gaoya dianqi, 2013 基于对多种检测技术应用特点的分析,提出一种有无异常的快速巡检、电检测确认异常及部位、辅助检测分析印证异常的三步序综合判断GIS中局部放电缺陷的诊断策略。针对一起110 kV GIS的绝缘缺陷,遵循综合检测策略,进行了测试分析。测试结果验证了该综合诊断策略的有效性,为准确判断运行中的GIS绝缘缺陷提供了一种新的诊断策略。
王科
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[Strategies for immunotherapy-related hepatotoxicity in liver cancer]. [PDF]
Zhonghua Gan Zang Bing Za Zhi, 2023 Zhi Y, Mao YM.
europepmc +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Grounded in social cognitive theory, this study investigated how high‐evidence factors jointly contribute to Chinese‐as‐a‐foreign‐language (CFL) speaking self‐efficacy. Data from 236 CFL learners in Beijing revealed a multifaceted pattern of associations.
Peijian Paul Sun +3 more
wiley +1 more source
Gaoya dianqi, 2016 提出一种模块化多电平结构应用于动态电压补偿器的新技术。模块化多电平结构易扩展,便于实现,且具有公共直流母线,能够实现四象限运行。文中对模块化多电平动态电压补偿器的拓扑结构和工作特性进行介绍和理论分析。通过对几种补偿策略、子模块电容电压控制策略和MMC逆变单元调制策略的对比介绍,提出了适用于模块化多电平动态电压补偿器的同相补偿、子模块电容电压分层控制和载波移相PWM调制的控制策略。利用PSCAD软件搭建仿真模型,通过仿真分析,验证了模块化多电平动态电压补偿器控制策略的有效性和可行性。
王宝安, 邢珏, 商姣, 万杰星
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Challenges and suggestions for exergaming program in exercise among older adults. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2023 Ning H +5 more
europepmc +1 more source
Public Administration, EarlyView.ABSTRACT As the public sector increasingly adopts AI‐powered automated decision systems (ADS), understanding how citizens experience and value ADS use in public decision‐making is both normatively and practically important. Therefore, we examine and compare the effects of seven attributes of public values on citizens' support for ADS adoption in two ...
Guimin Zheng +4 more
wiley +1 more source