The increasing dependence on data highlights the need for a detailed understanding of its behavior,encompassing the challenges involved in processing and evaluating it.However,current research lacks a comprehensive st...The increasing dependence on data highlights the need for a detailed understanding of its behavior,encompassing the challenges involved in processing and evaluating it.However,current research lacks a comprehensive structure for measuring the worth of data elements,hindering effective navigation of the changing digital environment.This paper aims to fill this research gap by introducing the innovative concept of“data components.”It proposes a graphtheoretic representation model that presents a clear mathematical definition and demonstrates the superiority of data components over traditional processing methods.Additionally,the paper introduces an information measurement model that provides a way to calculate the information entropy of data components and establish their increased informational value.The paper also assesses the value of information,suggesting a pricing mechanism based on its significance.In conclusion,this paper establishes a robust framework for understanding and quantifying the value of implicit information in data,laying the groundwork for future research and practical applications.展开更多
对于LCL型并网发电系统,引入高通滤波器的单并网电流反馈有源阻尼方法因难以在谐振频率偏移较小的工况下抑制谐振尖峰,不利于系统可靠运行。为此,该文将单电流反馈点变换成逆变器侧电流,提出一种无额外传感器的单逆变器电流反馈谐振抑制...对于LCL型并网发电系统,引入高通滤波器的单并网电流反馈有源阻尼方法因难以在谐振频率偏移较小的工况下抑制谐振尖峰,不利于系统可靠运行。为此,该文将单电流反馈点变换成逆变器侧电流,提出一种无额外传感器的单逆变器电流反馈谐振抑制（inverter current feedback resonance suppression,ICFRS）方法,降低了控制所导致的谐振频率偏差对谐振抑制的影响。另一方面,考虑到数字控制下控制延时和电网阻抗的影响,推导出该方法所等效的虚拟阻性的正负分界频率范围为[fs/6,fs/3）是系统鲁棒性差的根本原因,提出鲁棒ICFRS方法。该情况下,无论弱电网下电网阻抗如何变化,所等效的虚拟电阻均呈正阻性,进而提高了系统的稳定性。同时,详细分析系统的控制性能,选取合适的控制参数,避免了参数的反复试凑。最后,通过仿真和实验结果验证所提控制方法的有效性。展开更多
基金supported by the EU H2020 Research and Innovation Program under the Marie Sklodowska-Curie Grant Agreement(Project-DEEP,Grant number:101109045)National Key R&D Program of China with Grant number 2018YFB1800804+2 种基金the National Natural Science Foundation of China(Nos.NSFC 61925105,and 62171257)Tsinghua University-China Mobile Communications Group Co.,Ltd,Joint Institutethe Fundamental Research Funds for the Central Universities,China(No.FRF-NP-20-03)。
文摘The increasing dependence on data highlights the need for a detailed understanding of its behavior,encompassing the challenges involved in processing and evaluating it.However,current research lacks a comprehensive structure for measuring the worth of data elements,hindering effective navigation of the changing digital environment.This paper aims to fill this research gap by introducing the innovative concept of“data components.”It proposes a graphtheoretic representation model that presents a clear mathematical definition and demonstrates the superiority of data components over traditional processing methods.Additionally,the paper introduces an information measurement model that provides a way to calculate the information entropy of data components and establish their increased informational value.The paper also assesses the value of information,suggesting a pricing mechanism based on its significance.In conclusion,this paper establishes a robust framework for understanding and quantifying the value of implicit information in data,laying the groundwork for future research and practical applications.
文摘对于LCL型并网发电系统,引入高通滤波器的单并网电流反馈有源阻尼方法因难以在谐振频率偏移较小的工况下抑制谐振尖峰,不利于系统可靠运行。为此,该文将单电流反馈点变换成逆变器侧电流,提出一种无额外传感器的单逆变器电流反馈谐振抑制（inverter current feedback resonance suppression,ICFRS）方法,降低了控制所导致的谐振频率偏差对谐振抑制的影响。另一方面,考虑到数字控制下控制延时和电网阻抗的影响,推导出该方法所等效的虚拟阻性的正负分界频率范围为[fs/6,fs/3）是系统鲁棒性差的根本原因,提出鲁棒ICFRS方法。该情况下,无论弱电网下电网阻抗如何变化,所等效的虚拟电阻均呈正阻性,进而提高了系统的稳定性。同时,详细分析系统的控制性能,选取合适的控制参数,避免了参数的反复试凑。最后,通过仿真和实验结果验证所提控制方法的有效性。
