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阻尼正弦瞬变传导抗扰度的校准实验研究  [PDF]
陈 ?,许 鸣,张孙虎,彭 飞,郑泽宇
南京师范大学学报(工程技术版) , 2015,
Abstract: 阻尼正弦瞬变常见于电力系统、强电磁干扰中,会对敏感的电气电子设备造成损害.分析了阻尼正弦瞬变发生的机理,参照国军标GJB151A-97和GJB152A-97的要求,设计了阻尼正弦瞬变传导抗扰度的校准实验.实验合理的利用了现有仪器设备,采集到了符合标准要求的阻尼正弦波形.
合并单元的电快速瞬变脉冲群抗扰度分析  [PDF]
徐丽青,丁泉,史志伟,余华武
电力系统自动化 , 2014, DOI: 10.7500/AEPS20131221001
Abstract: 针对合并单元在电快速瞬变脉冲群试验中出现的问题,分析了电快速瞬变脉冲群干扰的特点,提出一种适用于合并单元的电快速瞬变脉冲群的抗扰度措施。提出采用金属化聚酯薄膜电容和瞬态抑制二极管改进交流回路的滤波结构,增强对高频干扰的抑制能力。通过优化母板PCB布局和布线,减少各回路之间耦合的影响。试验结果表明,采用改进后的合并单元能通过电快速瞬变脉冲群4级的要求。
电快速瞬变脉冲群抗扰度试验发生器的建模  [PDF]
翟小社,耿英三,王建华,宋政湘,张国钢
中国电机工程学报 , 2010,
Abstract: 为了在设计的早期阶段,以仿真的方式预测电子产品在电快速瞬变脉冲群(electricalfasttransient/burst,EFT/B)抗扰度试验中的性能,需要建立干扰源发生器及标准耦合装置的仿真模型。为适应EFT/B抗扰度试验标准的修订和补充,提出一种系统化的EFT/B发生器等效电路的建模方法。首先,基于对发生器充放电物理过程的分析,提出开路条件(1kW)下发生器输出波形的解析表达式,且表达式系数可根据仪器厂商的校准波形加以确定;其次,基于该解析式并采用阶跃函数激励,得到脉冲形成网络的传递函数,并分别采用恒电阻法及参数化电网络综合法得到脉冲形成网络的等效电路;最后,对等效电路各元件参数进行归一化处理,并根据发生器在匹配条件下(50W)的校准波形确定归一化系数。将EFT/B发生器的等效电路模型与标准容性耦合夹电路模型进行连接仿真,通过仿真与测量结果的对照验证了所提方法的合理性。
微机保护装置的电快速瞬变脉冲群抗扰度研究  [PDF]
梁志成,傅静波,李富同,江峰,何彬
电力系统自动化 , 2003,
Abstract: 微机保护装置运行所处电磁环境恶劣,提高其抗干扰性对电网的安全、可靠运行具有重要意义。讨论了电快速瞬变脉冲群干扰的产生机理和特征,介绍了相关电磁兼容标准,分析了电快速瞬变脉冲群干扰对微机保护装置的影响,针对微机保护装置的不同端口提出了相应的抑制措施。
The Extraordinary SVD  [PDF]
Carla D. Martin,Mason A. Porter
Physics , 2011,
Abstract: The singular value decomposition (SVD) is a popular matrix factorization that has been used widely in applications ever since an efficient algorithm for its computation was developed in the 1970s. In recent years, the SVD has become even more prominent due to a surge in applications and increased computational memory and speed. To illustrate the vitality of the SVD in data analysis, we highlight three of its lesser-known yet fascinating applications: the SVD can be used to characterize political positions of Congressmen, measure the growth rate of crystals in igneous rock, and examine entanglement in quantum computation. We also discuss higher-dimensional generalizations of the SVD, which have become increasingly crucial with the newfound wealth of multidimensional data and have launched new research initiatives in both theoretical and applied mathematics. With its bountiful theory and applications, the SVD is truly extraordinary.
抑制张力波动传播的自抗扰解耦控制
Linear Active Disturbance Rejection Decoupling Control for Suppressing Propagation of Tension Fluctuation
 [PDF]

曹健
- , 2015,
Abstract: 以减弱机架间张力耦合作用、减小张力波动对下游区段张力稳定的影响为目标,提出线性自抗扰解耦控制解决方案。在建立系统动态机理模型的基础上,将各机架间的动态耦合视为扰动,由线性扩张状态观测器实时估计并采用状态反馈控制予以补偿,通过设计与静态解耦器串联的线性自抗扰控制器,使复杂的多输入多输出MIMO(multi-input-multi-output, MIMO)系统解耦成多个并行的单输入单输出子系统。仿真结果表明:与传统的分散PID控制方法相比,该控制器不仅有效减弱了机架间张力的耦合作用,抑制了张力波动向下游段传播,而且使系统对模型失配和外部干扰等不确定因素具有良好的鲁棒性能。
To decrease the interaction between tension zones and prevent the tension fluctuation propagating downstream, we propose a decoupling strategy based on linear active disturbance rejection control (LADRC). First, the dynamic mechanism model of a multi-stage tension system was built. Then, the dynamic interaction between the channels of the multi-stage tension system was treated as disturbances which were estimated with a linear extended state observer (LESO), and the estimated states were employed for state feedback control and compensation. After that we designed the LADRC controller cascading with static decoupling, which decoupled the multi-input multi-output (MIMO) system into a parallel single-input single-output subsystem. The simulation results show that the LADRC controller designed is able to effectively prevent the propagation of tension fluctuation downstream and has better disturbance rejection performance than that of classical decentralized proportional integration differentiation (PID) controller no matter whether for model mismatch or for external disturbance
多功能电能表的电快速瞬变脉冲群问题处理方法研究  [PDF]
丁锦辉,赵阳,张杨,张小飞,郭凡铖
南京师范大学学报(工程技术版) , 2014,
Abstract: 针对多功能电能表的电快速瞬变脉冲群(electricalfasttransient,EFT)抗扰度问题,分析了EFT产生和骚扰机理,研究了EFT的处理方法,提出了针对多功能电能表电源输入端口电快速瞬变脉冲群问题的解决方法.试验结果表明,所提方法可以有效提高多功能电能表的EFT抗扰度等级,达到GB/T17626.4―2006标准要求.
机车辅助电源电快速瞬变脉冲群试验案例分析  [PDF]
窦爱玉,赵阳,颜伟,慈文彦,王珏
南京师范大学学报(工程技术版) , 2014,
Abstract: 针对机车辅助电源电快速瞬变脉冲群(EFT)抗扰度问题,分析了脉冲群产生和骚扰机理,研究了脉冲群的处理方法,提出了针对电源线EFT问题的解决方法.试验结果表明,所提方法可以有效提高机车辅助电源EFT抗扰度等级,达到GB/T17626.4―2008标准要求.
On GROUSE and Incremental SVD  [PDF]
Laura Balzano,Stephen J. Wright
Computer Science , 2013,
Abstract: GROUSE (Grassmannian Rank-One Update Subspace Estimation) is an incremental algorithm for identifying a subspace of Rn from a sequence of vectors in this subspace, where only a subset of components of each vector is revealed at each iteration. Recent analysis has shown that GROUSE converges locally at an expected linear rate, under certain assumptions. GROUSE has a similar flavor to the incremental singular value decomposition algorithm, which updates the SVD of a matrix following addition of a single column. In this paper, we modify the incremental SVD approach to handle missing data, and demonstrate that this modified approach is equivalent to GROUSE, for a certain choice of an algorithmic parameter.
广义微扰法  [PDF]
梁昌洪,曹祥玉
电子学报 , 2003,
Abstract: 本文针对目前电磁理论微扰法处理中的某些不足,提出微扰量、不变量和逐级处理这三个概念.以介质微扰为例,得到了精度更高的谐振腔和波导的二级微扰结果.
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