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Real-time simulation platform for photovoltaic system with a boost converter using MPPT algorithm in a DSP

Geethanjali PURUSHOTHAMAN, Vimisha VENUGOPALAN, Aleena Mariya VINCENT

《能源前沿(英文)》 2013年 第7卷 第3期   页码 373-379 doi: 10.1007/s11708-013-0272-8

摘要: Recently, real-time simulation of renewable energy sources are indispensible for evaluating the performance of the maximum power point tracking (MPPT) controller, especially in the photovoltaic (PV) system in order to reduce cost in the testing phase. Nowadays, real time PV simulators are obtained by using analog and/or digital components. In this paper, a real-time simulation of a PV system with a boost converter was proposed using only the digital signal processor (DSP) processor with two DC voltage sources to emulate the temperature and irradiation in the PV system. A MATLAB/Simulink environment was used to develop the real-time PV system with a boost converter into a C-program and build it into a DSP controller TMS320F28335. Besides, the performance of the real-time DSP-based PV was tested in different temperature and irradiation conditions to observe the P-V and V-I characteristics. Further, the performance of the PV with a boost converter was tested at different temperatures and irradiations using MPPT algorithms. This scheme was tested through simulation and the results were validated with that of standard conditions given in the PV data sheets. Implementation of this project helped to attract more researchers to study renewable energy applications without real sources. This might facilitate the study of PV systems in a real-time scenario and the evaluation of what should be expected for PV modules available in the market.

关键词: photovoltaic (PV) module     digital signal processor (DSP) controller     power electronic converter     real-time simulation    

A simple digital control algorithm for three phase shunt active filter: simulation and experimentation

Subbaraman SRINATH, Chandan KUMAR, M. P. SELVAN

《能源前沿(英文)》 2014年 第8卷 第1期   页码 119-128 doi: 10.1007/s11708-013-0288-0

摘要: A novel and simple control algorithm using digital signal processor (DSP) has been proposed and realized for a three phase shunt active filter (SAF). The simulation and prototype construction of SAF is conducted to compensate the reactive power and harmonics in a distribution system. The major feature of the proposed algorithm is that it does not require unit vector templates and any transformations for the reference current generation of SAF. This reduces the computational complexity and makes the control flexible and faster. The simulation is conducted in MATLAB/SIMULINK while DSP TMS320LF2407 is employed in the digital implementation of hysteresis current control (HCC) for experimentation. The hardware results correlate with the simulation results in reducing the total harmonic distortion (THD) of the source current and achieving unity power factor.

关键词: shunt active filter (SAF)     power quality     voltage source inverter (VSI)     digital signal processor (DSP)     total harmonic distortion (THD)     power factor improvement    

Structural design of morphing trailing edge actuated by SMA

Qi WANG, Zhiwei XU, Qian ZHU

《机械工程前沿(英文)》 2013年 第8卷 第3期   页码 268-275 doi: 10.1007/s11465-013-0261-y

摘要:

In this paper, the morphing trailing edge is designed to achieve the up and down deflection under the aerodynamic load. After a detailed and accurate computational analysis to determine the SMA specifications and layout programs, a solid model is created in CATIA and the structures of the morphing wing trailing edge are produced by CNC machining. A set of DSP measurement and control system is designed to accomplish the controlling experiment of the morphing wing trailing edge. At last, via the force analysis, the trailing edge is fabricated with four sections of aluminum alloy, and the arrangement scheme of SMA wires is determined. Experiment of precise control integral has been performed to survey the control effect. The experiment consists of deflection angle tests of the third joint and the integral structure. Primarily, the ultimate deflection angle is tested in these two experiments. Therefore, the controlling experiment of different angles could be performed within this range. The results show that the deflection error is less than 4% and response time is less than 6.7 s, the precise controlling of the morphing trailing edge is preliminary realized.

关键词: morphing wing trailing edge     shape memory alloy     digital signal processor     PID algorithm    

提高硅微谐振系统性能的一项有效措施

夏敦柱,王寿荣,周百令

《中国工程科学》 2006年 第8卷 第10期   页码 71-74

摘要: 详细分析了AD9954作为智能精密驱动源的粗细搜索两种阶段工作流程并给出与DSP器件的数字接口技术。结合实验数据和扫频曲线,得出在不同真空度环境下谐振器的两种扫频结果,并对谐振系统的工作情况给予评价。

关键词: 直接数字合成(DDS)     硅微谐振器     AD9954     数字信号处理(DSP)    

Digital image correlation-based structural state detection through deep learning

《结构与土木工程前沿(英文)》 2022年 第16卷 第1期   页码 45-56 doi: 10.1007/s11709-021-0777-x

摘要: This paper presents a new approach for automatical classification of structural state through deep learning. In this work, a Convolutional Neural Network (CNN) was designed to fuse both the feature extraction and classification blocks into an intelligent and compact learning system and detect the structural state of a steel frame; the input was a series of vibration signals, and the output was a structural state. The digital image correlation (DIC) technology was utilized to collect vibration information of an actual steel frame, and subsequently, the raw signals, without further pre-processing, were directly utilized as the CNN samples. The results show that CNN can achieve 99% classification accuracy for the research model. Besides, compared with the backpropagation neural network (BPNN), the CNN had an accuracy similar to that of the BPNN, but it only consumes 19% of the training time. The outputs of the convolution and pooling layers were visually displayed and discussed as well. It is demonstrated that: 1) the CNN can extract the structural state information from the vibration signals and classify them; 2) the detection and computational performance of the CNN for the incomplete data are better than that of the BPNN; 3) the CNN has better anti-noise ability.

关键词: structural state detection     deep learning     digital image correlation     vibration signal     steel frame    

基于DSP的混合动力汽车永磁同步电机的矢量控制系统

夏若飞,祝龙记,朱红,陆康

《中国工程科学》 2014年 第16卷 第8期   页码 79-82

摘要:

为了使混合动力汽车的永磁同步电机获得快速的转速响应和稳定的静态特性,介绍了一种基于数字信号处理器(DSP)的矢量控制方案,将矢量控制方法引入电动汽车的电机控制中

关键词: 电动汽车     矢量控制     数字信号处理器(DSP    永磁同步电机    

无轴承永磁同步电机转子磁场定向控制系统研究

朱熀秋,巫亮,周阳,张腾超,邓建明

《中国工程科学》 2006年 第8卷 第6期   页码 35-40

摘要:

无轴承永磁同步电机是具有磁悬浮轴承优点的一种新型电机;在阐述了无轴承永磁同步电机工作原理基础上,采用转子磁场定向控制策略,推导了无轴承永磁同步电机径向悬浮力和电机旋转部分数学模型;根据无轴承电机解耦控制的要求设计了无轴承永磁同步电机转子磁场定向矢量控制系统,并以数字信号处理器TMS320LF2407为核心,研制了矢量控制系统的硬件和软件。实验结果表明:电机工作在0~3000r/min范围内,转子悬浮稳定且电机转速连续可调。

关键词: 无轴承永磁同步电机     解耦控制     数字信号处理器     数字控制    

后E级时代高性能处理器架构的探索 None

Xiang-hui XIE, Xun JIA

《信息与电子工程前沿(英文)》 2018年 第19卷 第10期   页码 1224-1229 doi: 10.1631/FITEE.1800424

摘要: 科学计算与工程应用对高性能日益增长的需求将推动高性能计算进入后E级时代。高性能处理器作为超级计算系统核心部件,其架构设计对提高系统性能至关重要。首先介绍后E级时代高性能处理器架构设计的3个目标,即性能有效扩展、资源高效利用和适应多种应用。其次,提出标量运算众核主芯片连接应用加速从芯片的Massa处理器架构,通过计算资源分布和应用定制硬件的结合,满足后E级时代高性能处理器架构设计的目标。最后,讨论了Massa架构未来需要重点研究的若干问题。

关键词: 高性能计算;后E级;处理器架构;应用定制硬件;计算资源分布    

CHARACTERISTICS OF HERBIVORY/WOUND-ELICITED ELECTRICAL SIGNAL TRANSDUCTION IN TOMATO

《农业科学与工程前沿(英文)》 2021年 第8卷 第2期

摘要:

Electrical signals commonly occur in plants in response to various environmental changes and have a dominant function in plant acclimation. The transduction of wound-elicited electrical signals in the model plant species Arabidopsis has been characterized but the characteristics of electrical signal transduction in response to herbivory or wounding in crop species remain unknown. Here, the features of electrical signals elicited by insect herbivory and wounding in tomato were investigated. Unlike those in Arabidopsis, wounding tomato leaves did not cause leaf-to-leaf electrical signal transduction. In contrast, electrical signals elicited in response to petiole wounding were stronger and more strongly transduced. Leaflet wounding also activated electrical signal transduction and jasmonic acid (JA) signaling within the whole compound leaf. It was also demonstrated that tomato glutamate receptor-like 3.3 (GLR3.3) and GLR3.5 mediated leaflet-to-leaflet electrical signal transduction. Herbivory-induced JA accumulation and Helicoverpa armigera resistance were reduced in glr3.3/3.5 plants. This work reveals the nature of electrical signal transduction in tomato and emphasizes the key roles of GLR3.3 and GLR3.5 in electrical signal transduction and JA signaling activation.

 

关键词: electrical signal / glutamate receptor-like / herbivory / jasmonic acid / tomato    

Acoustic fault signal extraction via the line-defect phononic crystals

《机械工程前沿(英文)》 2022年 第17卷 第1期   页码 10-10 doi: 10.1007/s11465-021-0666-y

摘要: Rotating machine fault signal extraction becomes increasingly important in practical engineering applications. However, fault signals with low signal-to-noise ratios (SNRs) are difficult to extract, especially at the early stage of fault diagnosis. In this paper, 2D line-defect phononic crystals (PCs) consisting of periodic acrylic tubes with slit are proposed for weak signal detection. The defect band, namely, the formed resonance band of line-defect PCs enables the incident acoustic wave at the resonance frequency to be trapped and enhanced at the resonance cavity. The noise can be filtered by the band gap. As a result, fault signals with high SNRs can be obtained for fault feature extraction. The effectiveness of weak harmonic and periodic impulse signal detection via line-defect PCs are investigated in numerical and experimental studies. All the numerical and experimental results indicate that line-defect PCs can be well used for extracting weak harmonic and periodic impulse signals. This work will provide potential for extracting weak signals in many practical engineering applications.

关键词: phononic crystals     line-defect     fault signal extraction     acoustic enhancement    

Revisiting digital twins: Origins, fundamentals, and practices

《工程管理前沿(英文)》   页码 668-676 doi: 10.1007/s42524-022-0216-2

摘要: The digital twins (DT) has quickly become a hot topic since it was proposed. It appears in all kinds of commercial propaganda and is widely quoted by academic circles. However, the term DT has misstatements and is misused in business and academics. This study revisits DT and defines it to be a more advanced system/product/service modeling and simulation environment that combines most modern information communication technologies (ICTs) and engineering mechanism digitization and characterized by system/product/service life cycle management, physically geometric visualization, real-time sensing and measurement of system operating conditions, predictability of system performance/safety/lifespan, and complete engineering mechanisms-based simulations. The idea of DT originates from modeling and simulation practices of engineering informatization, including virtual manufacturing (VM), model predictive control, and building information modeling (BIM). On the basis of the two-element VM model, we propose a three-element model to represent DT. DT does not have its unique technical characteristics. The existing practices of DT are extensions of the engineering informatization embracing modern ICTs. These insights clarify the origin of DT and its technical essentials.

关键词: virtual manufacturing     digital twins     modeling and simulation     digitization     computational engineering    

Development trend of urban design in “digital age”: Pan-dimensionality and individual-ubiquity

《结构与土木工程前沿(英文)》 2021年 第15卷 第3期   页码 569-575 doi: 10.1007/s11709-021-0735-7

摘要: The wave of “digital age” featuring digital information is coming. Digital technology is profoundly changing the societal development direction and evolution paths. It also has significant bearing on production modes, social interactions and lifestyles. With regard to urban design, a system of knowledge about the creation and adaptation of material space forms that integrate humanities, art, technology and materials, digital technology has provided it with a brand-new and revolutionary scientific impetus for its evolution. The result of this evolution is “digital urban design paradigm based on human-computer interaction”, i.e., the urban development is moving toward “pan-dimensionality” and “individual ubiquity”. The future of urban design will construct a new approach to urban research and engineering, which is more complex, capable of accommodating and compatible with multiple goals of “instrumental rationality” and “value rationality”. Such a new approach shall be led by the probabilistic theory of “gray scale thinking”, reflecting quaternary synergetic view of “scientific rationality, ecological rationality, cultural rationality and technical rationality” to realize the cognitive progress of “engineering for the benefit of mankind”.

关键词: digital age     urban design     multiple objectives     human-computer interaction     pan-dimensionality     individual-ubiquity    

The role of protein kinase C epsilon in neural signal transduction and neurogenic diseases

null

《医学前沿(英文)》 2011年 第5卷 第1期   页码 70-76 doi: 10.1007/s11684-011-0119-9

摘要:

Protein kinase C epsilon (PKC ?) is one of major isoforms in novel PKC family. Although it has been extensively characterized in the past decade, the role of PKC ? in neuron is still not well understood. Advances in molecular biology have now removed significant barriers to the direct investigation of PKC ? functions in vivo, and PKC ? has been increasingly implicated in the neural biological functions and associated neurogenic diseases. Recent studies have provided important insights into the influence of PKC ? on cortical processing at both the single cell level and network level. These studies provide compelling evidence that PKC ? could regulate distinct aspects of neural signal transduction and suggest that the coordinated actions of a number of molecular signals contribute to the specification and differentiation of PKC ? signal pathway in the developing brain.

关键词: protein kinase C ?     signal transduction     neurogenic disease    

提高地下金属管振动波测试中冲击响应信号的信噪比

韩修廷,王洁春,焦振强,高飞,宋宇波

《中国工程科学》 2005年 第7卷 第10期   页码 64-68

摘要:

提出了在套损振动波检测过程中提高信号信噪比的方法。检测过程中,在井口敲击套管并接收、分析套管的回波,以了解介质的变化情况。由于反射波信号强度较微弱,单纯用一组接收信号无法进行正确的套损分析,采用信号增强方法,即利用多个类似信号进行叠加,增强反射波的有效信号,降低背景噪声,从而得到有用信息,进行正确的套损状况分析。开发了相应的信号处理软件,提高了信号处理速度。通过10井次的测试表明,技术原理可行,软件工作稳定、可靠,便于操作,可以进行多种方法的信号处理,极大地提高了工作效率。

关键词: 振动波     反射波     信号增强     信号叠加    

CHALLENGES AND CAPACITY GAPS IN SMALLHOLDER ACCESS TO DIGITAL EXTENSION AND ADVISORY SERVICES IN KENYA

《农业科学与工程前沿(英文)》 2022年 第9卷 第4期   页码 642-654 doi: 10.15302/J-FASE-2021423

摘要:

● Seventy-eight percent of farmers accessed extension and advisory services from electronic sources dominated by radio.

关键词: advisory service     agricultural extension     digital extension     digital literacy    

标题 作者 时间 类型 操作

Real-time simulation platform for photovoltaic system with a boost converter using MPPT algorithm in a DSP

Geethanjali PURUSHOTHAMAN, Vimisha VENUGOPALAN, Aleena Mariya VINCENT

期刊论文

A simple digital control algorithm for three phase shunt active filter: simulation and experimentation

Subbaraman SRINATH, Chandan KUMAR, M. P. SELVAN

期刊论文

Structural design of morphing trailing edge actuated by SMA

Qi WANG, Zhiwei XU, Qian ZHU

期刊论文

提高硅微谐振系统性能的一项有效措施

夏敦柱,王寿荣,周百令

期刊论文

Digital image correlation-based structural state detection through deep learning

期刊论文

基于DSP的混合动力汽车永磁同步电机的矢量控制系统

夏若飞,祝龙记,朱红,陆康

期刊论文

无轴承永磁同步电机转子磁场定向控制系统研究

朱熀秋,巫亮,周阳,张腾超,邓建明

期刊论文

后E级时代高性能处理器架构的探索

Xiang-hui XIE, Xun JIA

期刊论文

CHARACTERISTICS OF HERBIVORY/WOUND-ELICITED ELECTRICAL SIGNAL TRANSDUCTION IN TOMATO

期刊论文

Acoustic fault signal extraction via the line-defect phononic crystals

期刊论文

Revisiting digital twins: Origins, fundamentals, and practices

期刊论文

Development trend of urban design in “digital age”: Pan-dimensionality and individual-ubiquity

期刊论文

The role of protein kinase C epsilon in neural signal transduction and neurogenic diseases

null

期刊论文

提高地下金属管振动波测试中冲击响应信号的信噪比

韩修廷,王洁春,焦振强,高飞,宋宇波

期刊论文

CHALLENGES AND CAPACITY GAPS IN SMALLHOLDER ACCESS TO DIGITAL EXTENSION AND ADVISORY SERVICES IN KENYA

期刊论文