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206篇 您的检索式:作者名="Aniruddha"
    题名 作者 年代 出处 被引量
1模块化多电平换流器戴维南等效整体建模方法显示文摘针对模块化多电平换流器(modular multilevel converter,MMC)在电平数很高时电磁暂态离线仿真效率低下的问题,提出一种基于戴维南等效的MMC电磁暂态整体建模方法。具体而言,在建立MMC戴维南等效模型的过程中:1)假设MMC中全部开关器件都具备理想的关断特性(也即关断电阻无穷大);2)采用同样绝对稳定的后退欧拉法来替代通常采用的梯形积分法对子模块电容进行离散化;3)结合1)和2),提出一种计算复杂度与MMC桥臂子模块数相同的高效排序均压算法;4)针对所提出模型的特点,提出一种精确的MMC闭锁仿真方法。所提MMC整体模型的计算复杂度随着电平数的增加线性增长。在PSCAD/EMTDC下与MMC详细模型仿真对比表明,所提MMC整体模型的暂稳态最大精度误差在2‰以内,并且在仿真121电平MMC时所提模型的加速比在2 770倍以上。许建中 赵成勇 Aniruddha M.Gole 2015中国电机工程学报2015,35,8:71
2考虑内部动态特性的模块化多电平换流器小信号模型显示文摘小信号模型是系统稳定性分析和进行参数设计的重要方法。目前对于模块化多电平换流器(modular multilevel converter,MMC)的小信号建模,通常忽略子模块电容电压波动、内部环流、环流抑制控制器等内部动态行为,从而简化状态空间模型的建立,但却对系统特征根和稳定性分析造成一定误差。文中考虑换流器的内部动态特性,建立了详细的MMC阀的小信号模型,所建立的小信号模型提供与外部控制器和交、直流系统方便的接口,具有较强的通用性。通过与电磁暂态仿真模型的动态响应对比,验证了所提出模型的准确性。同时,建立了简化的端模型的状态空间方程,并将简化模型和MMC详细模型的小信号分析结果进行对比,结果表明,应用简化的端模型评估系统动态特性存在一定误差,且对部分系统不稳定现象无法预估判断,从而验证了建立MMC详细小信号模型的必要性。李探 Aniruddha M.Gole 赵成勇 2016中国电机工程学报2016,36,11:65
3混合双极高压直流输电系统的特性研究显示文摘为了充分发挥电网换相换流器高压直流输电系统(line commutated converter based high voltage direct current,LCC-HVDC)和电压源换流器高压直流输电系统(voltagesource converter based HVDC,VSC-HVDC)的优势,针对一种新型的混合双极高压直流输电系统(hybrid bipolar basedhigh voltage direct current,HB-HVDC)进行了研究,该系统的正极是传统的12脉动LCC-HVDC系统,而负极是VSC-HVDC系统。建立了由LCC正极和VSC负极组成的混合双极高压直流输电系统的模型,推导了其在稳态时的数学模型,并设计了正负极之间的协调控制策略。在PSCAD/EMTDC环境下对HB-HVDC系统的稳态和暂态运行特性进行了研究分析。最后对HB-HVDC系统和闭锁负极VSC-HVDC后LCC-HVDC系统的运行特性进行了对比研究。结果表明:HB-HVDC系统可以更好地调节交流母线电压,减少LCC极换相失败的可能性,并且具有快速的故障恢复能力;同时也证明所设计的协调控制策略可以有效地改善HB-HVDC系统的稳态和动态特性。郭春义 赵成勇 Allan Montanari Aniruddha M.Gole 肖湘宁 2012中国电机工程学报2012,32,10:60
4MMC-HVDC内部谐波模态识别及其稳定性分析显示文摘基于'动态相量'的思想建立对不同环流抑制策略下的模块化多电平换流器(modular multilevel converter,MMC)小信号模型,并通过与时域仿真的对比验证所建小信号模型的精确性。然后对小信号模型进行模态分析,通过计算参与因子将MMC-HVDC系统的模态分为'外部模态'和'内部谐波模态',并表明采用简化MMC端模型无法对内部谐波模态进行分析。另外,对MMC内部谐波模态及其影响因素进行重点详细的分析,分析表明,MMC的内部谐波模态通常呈弱阻尼特性,在系统稳定性分析中不能忽略,换流器的环流抑制策略、等效桥臂电阻、外部主控制器增益等都对内部谐波模态具有较大影响,并揭示MMC的'内部谐波不稳定'现象。最后揭示各因素对MMC内部谐波模态稳定性的影响规律,对工程参数设计和调试具有现实的指导意义。李探 赵成勇 Aniruddha M.Gole 2017中国电机工程学报2017,37,8:31
5基于频率相关网络等值的电磁–机电暂态解耦混合仿真显示文摘机电暂态稳定分析程序和电磁暂态程序均不能单独用于大规模交直流系统的仿真研究。开发一套基于频率相关网络等值的电磁–机电暂态解耦混合仿真系统。首先,介绍该系统的功能框架和软件模块构成。其次,给出电磁暂态侧和机电暂态侧等值电路的求取方法。然后,讨论传统诺顿等值电路与频率相关网络等值的区别,并介绍系统仿真交互时序与仿真流程。最后,采用一个纯交流系统和一个交直流混合系统的算例检验基于频率相关网络等值的混合仿真系统的仿真精度。张怡 吴文传 张伯明 Aniruddha M.Gole 2012中国电机工程学报2012,32,16:20
6电磁–机电暂态混合仿真中机电侧故障的仿真方法显示文摘基于频率相关网络等值(frequency dependent networkequivalent,FDNE)的电磁–机电暂态解耦混合仿真系统一般不能处理机电暂态侧网络的故障。首先提出一种伴随仿真方法来初始化多个FDNE的状态,以实现FDNE的平稳切换。另外,通过大量仿真研究提出一种临界电气距离指标,用于快速鉴别机电暂态侧故障时是否需要在仿真中修改FDNE。最后,提出一种基于上述临界电气距离指标的FDNE切换策略以减小总体计算量。仿真结果表明基于临界电气距离指标的FDNE切换策略能够保证混合仿真的精度和效率。张怡 吴文传 张伯明 Aniruddha M.Gole 2012中国电机工程学报2012,32,19:15
7Frequency Dependent Network Equivalent for Electromagnetic and Electromechanical Hybrid Simulation显示文摘频率相关网络等值(frequency dependent network equivalent,FDNE)不仅可以表示网络的基频响应特性,而且还可以表示网络的高频响应特性,从而能够应对电磁暂态、机电暂态混合仿真中的接口波形畸变问题。基于简化元件模型介绍FDNE的频率特性采样值的求取方法;应用矢量拟合法将上述频率特性采样值整体拟合成一个FDNE,并采用摄动法保证了此FDNE的无源性。最后,用多个算例说明基于FDNE的电磁—机电暂态混合仿真方法的精度及其优势。ZHANG Yi WU Wenchuan ZHANG Boming Aniruddha M. Gole 2012中国电机工程学报2012,32,13:15
8计及LCC-HVDC交直流系统静态电压稳定的综合短路比强度指标显示文摘针对过往电网换相换流器高压直流输电(line commutated converter based high voltage direct current,LCCHVDC)交直流系统的强度指标缺乏严密理论基础的问题,该文研究计及LCC-HVDC交直流系统静态电压稳定的强度指标定义方法。首先,定量分析单馈入LCC-HVDC系统不同控制方式对交直流系统静态电压稳定的影响。其次,提出一种能够衡量交直流系统电压稳定裕度的综合短路比(integrated short circuit ratio,ISCR)强度指标。该指标考虑了交直流系统的实际潮流信息,能够同时应用于交直流系统的规划、设计和运行阶段;兼顾了LCC-HVDC系统的直流功率–电压动态特性,能够研究控制方式差异性对其影响;同时,基于静态电压稳定极限定义的临界综合短路比(critical integrated short circuit ratio,CISCR)指标取值恒为1,因而能够刻画互联交流电网对直流系统的临界电压支撑强度。最后,考虑额定运行工况和负荷动态变化过程的算例分析结果,及不同强度指标的对比分析,均表明了采用ISCR和CISCR指标的有效性。肖浩 李银红 段献忠 Aniruddha M.Gole 2017中国电机工程学报2017,37,14:14
9Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection显示文摘The performance of a well-designed layer of sand, and composites like layer of sand mixed with shredded rubber tire(RSM) as low cost base isolators, is studied in shake table tests in the laboratory. The building foundation is modeled by a 200 mm by 200 mm and 40 mm thick rigid plexi-glass block. The block is placed in the middle of a 1m by 1m tank filled with sand. The selected base isolator is placed between the block and the sand foundation. Accelerometers are placed on top of the footing and foundation sand layer. The displacement of the footing is also measured by LVDT. The whole setup is mounted on a shake table and subjected to sinusoidal motions with varying amplitude and frequency. Sand is found to be effective only at very high amplitude(> 0.65 g) of motions. The performance of a composite consisting of sand and 50% shredded rubber tire placed under the footing is found to be most promising as a low-cost effective base isolator.Srijit Bandyopadhyay Aniruddha Sengupta G.R.Reddy 2015Earthquake Engineering and Engineering Vibration2015,14,4:10
10用于低频振荡抑制的MMC的能量补偿控制显示文摘传统的模块化多电平换流器(modular multilevel converter,MMC)的控制系统包括功率、电压控制等上层控制和控制环流的下层控制。直流系统可配合功率振荡抑制(power oscillation damping,POD)控制器为交流系统提供阻尼,但直流功率会根据POD控制器的输出而振荡。MMC桥臂电容器的能量可以用来平衡交流系统功率变化,从而保证直流功率的稳定。MMC的能量控制,可以控制环流电流的直流分量,从而灵活控制MMC桥臂电容器的能量。基于能量控制,该文设计一种能量补偿控制,数学分析MMC电容器上可利用的能量,并在PSCAD/EMTDC仿真平台上模拟MMC-HVDC为2机交流系统提供阻尼,可以验证能量补偿控制可以暂态解耦直流系统两端功率传输,从而将能量补偿控制用来解决嵌入式直流的3机系统使用传统POD控制方式时会导致振荡加剧的问题,证明采用能量补偿控制的必要性。翟冬玲 韩民晓 Mukesh Kumar Das Aniruddha M.Gole 2019中国电机工程学报2019,39,10:8
11Vascular Anomalies Encountered During Pancreatoduodenectomy: Do They Influence Outcomes?显示文摘Parul J. Shukla MS FRCS Savio G. Barreto MS Aniruddha Kulkarni MD Ganesh Nagarajan MS Abe Fingerhut MD FACS FRCS 2010Annals of Surgical Oncology2010,,1:5
12Targeted Blue Nanoparticles as Photoacoustic Contrast Agent for Brain Tumor Delineation显示文摘把一个肿瘤与非肿瘤的组织区分开来在癌症外科期间是一项挑战性的任务。几次尝试被做了使用可见或荧光灯的代理人在外科期间帮助一个肿瘤的可视化。我们描述一个新奇方法描出大脑肿瘤,用一种高度敏感的 photoacoustic 成像技术,那被用作一个对比代理人的指向肿瘤的蓝 nanoparticles 提高。幽灵并且在老鼠大脑上的实验,前 vivo,在描出表明 photoacoustic 成像的高敏感在集中包含对比代理人的肿瘤很比由肉眼为可视化需要降低。为 nanoparticles 的系统的察觉的限制是水(到 0.84 mol/L Coomassie 蓝染料的等价物) 里的大约 0.77 g/mL。当与强烈光的吸收对比代理人使用了时,现在的探索学习建议那 photoacoustic 成像,能由揭示肿瘤的分发和程度 intraoperatively 便于癌症外科。Aniruddha Ray Xueding Wang Yong-Eun Koo Lee Hoe Jin Hah Gwangseong Kim Thomas Chen Daniel A. Orringer Oren Sagher Xiaojun Liu Raoul Kopelman 2011Nano Research2011,4,11:5
13Tailoring the Meso-Structure of Gold Nanoparticles in Keratin-Based Activated Carbon Toward High-Performance Flexible Sensor显示文摘Flexible biosensors with high accuracy and reliable operation in detecting pH and uric acid levels in body fluids are fabricated using well-engineered metaldoped porous carbon as electrode material.The gold nanoparticles@N-doped carbon in situ are prepared using wool keratin as both a novel carbon precursor and a stabilizer.The conducting electrode material is fabricated at 500℃ under customized parameters,which mimics A-B type(two different repeating units) polymeric material and displays excellent deprotonation performance(pH sensitivity).The obtained pH sensor exhibits high pH sensitivity of 57 mV/pH unit and insignificant relative standard deviation of 0.088%.Conversely,the composite carbon material with sp^2 structure prepared at 700℃ is doped with nitrogen and gold nanoparticles,which exhibits good conductivity and electrocatalytic activity for uric acid oxidation.The uric acid sensor has linear response over a range of 1-150 μM and a limit of detection 0.1 μM.These results will provide new avenues where biological material will be the best start,which can be useful to target contradictory applications through molecular engineering at mesoscale.Aniruddha BPatil Zhaohui Meng Ronghui Wu Liyun Ma Zijie Xu Chenyang Shi Wu Qiu Qiang Liu Yifan Zhang Youhui Lin Naibo Lin Xiang Yang Liu 2020Nano-Micro Letters2020,12,9:3
14Golgi localization and dynamics of hyaluronan binding protein 1 (HABP1/p32/C1QBP) during the cell cycle显示文摘Hyaluronan binding protein 1 (HABP1) is a negatively charged multifunctional mammalian protein with a unique structural fold. Despite the fact that HABP1 possesses mitochondrial localization signal, it has also been localized to other cellular compartments. Using indirect immunofluorescence, we examined the sub-cellular localization of HABP1 and its dynamics during mitosis. We wanted to determine whether it distributes in any distinctive manner after mitotic nuclear envelope disassembly or is dispersed randomly throughout the cell. Our results reveal the golgi localization of HABP1 and demonstrate its complete dispersion throughout the cell during mitosis. This distinctive distribution pattern of HABP1 during mitosis resembles its ligand hyaluronan, suggesting that in concert with each other the two molecules play critical roles in this dynamic process.Aniruddha SENGUPTA Bhaswati BANERJEE Rakesh K. TYAGI Kasturi DATTA 2005Cell Research2005,15,3:3
15用椰壳制活性炭吸附去除三价铋离子(英文)显示文摘In present study,we report the preparation of coconut shell activated carbon as adsorbent and its appli-cation for Bi(Ⅲ) removal from aqueous solutions.The developed adsorbent was characterized with scanning elec-tron microscope(SEM),Fourier Transform Infrared(FTIR),C,H,N,S analyzer,and BET surface area analyzer.The parameters examined include agitation time,initial concentration of Bi(Ⅲ),adsorbent dose and temperature.The maximum adsorption of Bi(Ⅲ)(98.72%) was observed at 250 mg·L-1 of Bi(Ⅲ) and adsorbent dose of 0.7 g when agitation was at 160 r·min-1 for 240 min at(299±2) K.The thermodynamic parameters such as Gibb's free energy(△Gθ),enthalpy(△Hθ) and entropy(△Sθ) were evaluated.For the isotherm models applied to adsorption study,the Langmuir isotherm model fits better than the Freundlich isotherm.The maximum adsorption capacity from the Langmuir isotherm was 54.35 mg?g?1 of Bi(Ⅲ).The kinetic study of the adsorption shows that the pseudo second order model is more appropriate than the pseudo first order model.The result shows that,coconut shell ac-tivated carbon is an effective adsorbent to remove Bi(Ⅲ) from aqueous solutions with good adsorption capacity.SARTAPE Ashish MANDHARE Aniruddha SALVI Prathmesh PAWAR Dattatraya RAUT Prakash ANUSE Mansing KOLEKAR Sanjay 2012Chinese Journal of Chemical Engineering2012,20,4:3
16Electro-magnetohydrodynamic Flow of Biofluid Induced by Peristaltic Wave: A Non-newtonian Model显示文摘Gopal Chandra Shit Nayan Kumar Ranjit Aniruddha Sinha 2016Journal of Bionic Engineering2016,13,3:2
17MMC平均值模型在直流电网中的适用性分析显示文摘为了弥补原有AVM在仿真直流故障及换流器闭锁等方面精度不足的问题,研究了模块化多电平换流器(MMC)的平均值模型(AVM),在电压源换流器高压直流输电(VSC-HVDC)电网中的适用性.本文从MMC换流器拓扑的角度出发,提出了改进的AVM,采用MMC的电磁暂态(EMT)详细模型搭建的4端MMC型直流网络为基准,对比发现AVM有效的前提是MMC精确模型中的电容值足够大,以使得MMC中每个子模块(SM)的电容电压近似恒定.仿真证明:本文所提改进平均值模型能够精确仿真直流故障时换流器闭锁等工况,对MMC建模有着重要的工程指导意义.许建中 赵成勇 Aniruddha M.Gole 2015北京交通大学学报2015,39,5:2
18Novel synthesis with an atomized microemulsion technique and characterization of nano-calcium carbonate(CaCO_3)/poly(methyl methacrylate) core-shell nanoparticles显示文摘The synthesis of hard-core/soft-shell calcium carbonate(CaCO_3)/poly(methyl methacrylate)(PMMA)hybrid structured nanoparticles(<100nm) by an atomized microemulsion polymerization process is reported.The polymer chains were anchored onto the surface of nano-CaCO_3 through use of a coupling agent,triethoxyvinyl silane(TEVS).Ammonium persulfate(APS),sodium dodecyl sulfate(SDS)and n-pentanol were used as the initiator,surfactant and cosurfactant,respectively.The polymerization mechanism of the core-shell latex particles is discussed.The encapsulation of nano-CaCO_3 by PMMA was confirmed using a transmission electron microscope(TEM).The grafting percentage of the core-shell particles was investigated by thermogravimetric analysis(TGA).The nano-CaCO_3/PMMA core-shell particles were characterized by Fourier transform infrared(FTIR) spectroscopy and differential scanning calorimetry(DSC).The FTIR results revealed the existence of a strong interaction at the interface of the nano-CaCO_3 particle and the PMMA,which implies that the polymer chains were successfully grafted onto the surface of the nano-CaCO_3 particles through the link of the coupling agent.In addition,the TGA and DSC results indicated an enhancement of the thermal stability of the core-shell materials compared with that of the pure nano-PMMA.The nano-CaCO_3/PMMA particles were blended into a polypropylene(PP) matrix by melt processing.It can also be observed using scanning electron microscopy(SEM) that the PMMA chains grafted onto the CaCO_3 nanoparticles interfere with the aggregation of CaCO_3 in the polymer matrix(PP matrix) and thus improve the compatibility of the CaCO_3 nanoparticles with the PP matrix.Aniruddha Chatterjee Satyendra Mishra 2013Particuology2013,11,6:2
19Behavior of braced excavation in sand under a seismic condition: experimental and numerical studies显示文摘The behavior of braced excavation in dry sand under a seismic condition is investigated in this paper.A series of shake table tests on a reduced scale model of a retaining wall with one level of bracing were conducted to study the effect of different design parameters such as excavation depth,acceleration amplitude and wall stiffness.Numerical analyses using FLAC 2D were also performed considering one level of bracing.The strut forces,lateral displacements and bending moments in the wall at the end of earthquake motion were compared with experimental results.The study showed that in a post-seismic condition,when other factors were constant,lateral displacement,bending moment,strut forces and maximum ground surface displacement increased with excavation depth and the amplitude of base acceleration.The study also showed that as wall stiffness decreased,the lateral displacement of the wall and ground surface displacement increased,but the bending moment of the wall and strut forces decreased.The net earth pressure behind the walls was influenced by excavation depth and the peak acceleration amplitude,but did not change significantly with wall stiffness.Strut force was the least affected parameter when compared with others under a seismic condition.Sanku Konai Aniruddha Sengupta Kousik Deb 2018Earthquake Engineering and Engineering Vibration2018,17,2:2
20Vascular Anomalies Encountered During Pancreatoduodenectomy: Do They Influence Outcomes?显示文摘Parul J. Shukla Savio G. Barreto Aniruddha Kulkarni Ganesh Nagarajan Abe Fingerhut 2010Annals of Surgical Oncology2010,,1:2
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