共查询到20条相似文献,搜索用时 390 毫秒
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提出了一种新的适用于电力系统机网暂态过程数值仿真的有阻尼绕组同步电机模型。通过采用“旋转因子法”对同步电机的电压方程组进行差分化,成功地消除了因旋转电势引起的,存在于同步电机直轴电压方程和交轴电压方程之间的耦合,导出了相互解耦的直轴和交轴瞬态等值电路。文末的算例通过比较该模型与EMTP模型的仿真结果,证明这种新模型是正确的,其仿真算法比常用的EMTP算法更精确、更稳定。 相似文献
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基于离散HMM的电力电子电路故障诊断 总被引:4,自引:1,他引:3
本文提出了一种基于离散HMM(hidden Markov model)的电力电子电路诊断新方法。针对电力电子电路故障,阐述了HMM相应的基本原理和训练算法。以三相整流桥电路为例,实现了基于HMM的电路状态识别。仿真和实验结果证明本文提出的方法正确可行,具有工程的应用价值。 相似文献
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基于电化学理论方法和参数拟合,对脉冲电源作用下印染污水处理的电解槽负载进行建模.先在电化学原理的基础上进行理论建模,采用电化学阻抗谱方法,得出电解槽负载的等效电路模型.通过测量负载的阶跃响应曲线并进行参数拟合,对实际工程应用中的等效电路模型进行定量分析,得出模型中各个参数的具体值.最后按照得出的参数值进行仿真,并与实验结果相比较,比较结果证明了等效电路的合理性. 相似文献
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Christopher Michael Christopher Abel Mohammed Ismail 《International Journal of Circuit Theory and Applications》1992,20(3):327-348
An analogue CAD tool capable of simulating MOS circuit performance variance caused by intra-die variability inherent to IC fabrication processes has been developed. the nucleus of this tool is a general, CAD-compatible, MOS statistical model called SMOS which comprehends the effects of device geometry, circuit layout and transistor bias on parameter variance. an example of the model calculation procedure is presented to illustrate both the modelling algorithms and the process characterization data required by the statistical model. the statistical model is verified through experimental data which show excellent agreement with performance variances predicted by simulation. Implementations of the statistical model in two circuit simulation environments, SPICE and APLAC, are also described. Statistical analysis and simulation of two basic analogue subcircuits, the current mirror and the source-coupled pair, are presented. 相似文献
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结合电力系统时有发生的高压断路器跳闸、合闸线圈烧毁现象 ,二次回路[1 ] 保护器的概念被提出 ,并对其原理和实现方法进行了探讨。文中给出的实现方法将高压断路器二次回路完整性监视[2 ] 融入其中 ,使其兼有二次回路的保护和完整性监视双重功能。 相似文献
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介绍了变压器漏感对整流电路输出直流电压,晶闸管承受电压的影响.以三相整流电路为例进行实验,实测出负载电压的波形,晶闸管所承受电压的波形,理论和实际相符合,为准确研究整流电路打下基础. 相似文献
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变电站接地网不等电位模型数值计算 总被引:36,自引:11,他引:25
提出了一种接地网不等电位模型的数值计算方法,即考虑接地网导体内阻所引起的压降。该方法基于场路结合的思想形成以接地风钮体离散点上的电位为未知量的方程组,利用电路中的节点电压法和电流场导电媒质中导体间的互阻关系形成方程适用于以大地模型中接地网的计算,并适用于具有悬浮电极的接地网计算。给出了接地网等位和不等位模型计算结果的分析与比较。 相似文献
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A. Nascetti 《International Journal of Circuit Theory and Applications》2012,40(2):175-187
A charge‐to‐digital converter concept suitable for pixel‐level charge sensitive amplifiers is presented. The circuit implements a technique referred here as fractional charge packet counting, which ensures large dynamic range operation using constant integration time. By means of a particular circuit arrangement a constant number of significant bits is provided as output, thus ensuring a constant relative resolution over the entire dynamic range. A circuit implementing the concepts described above has been designed and simulated. Each block of the circuit is described in details and its characterization is presented. The circuit is capable to convert input currents in the range of 100 fA to 100 nA at 2 ksample/s with a constant resolution of 10 bit without the need of gain switching. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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Robert Joseph Mathews Todd J. Freeborn 《International Journal of Circuit Theory and Applications》2020,48(7):1057-1069
Parasitic capacitances and high-residual impedances (typical of electrode/tissue interfaces) have significant effects on estimated electrical impedances of tissues under study. This leads to deviations (especially at high frequency) from the true tissue impedance. This work outlines the circuit theory describing estimation errors occurring when one and two parasitic capacitances are present in tetrapolar electrode configurations typical for bioimpedance measurements. The described circuit theory was validated using both simulations and measurements of a fabricated printed circuit board that implemented the tetra-polar model. Using the presented model, correction procedures using (a) measurements of the source and sink excitation currents and (b) averaging measurements of forward and reverse electrode configurations have been validated in simulation showing reductions in the estimation errors at frequencies greater than 1 MHz. 相似文献
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Although the theory of integral manifolds is well known among applied mathematicians as a powerful tool in non-linear oscillations, it is relatively unknown, let alone applied, among circuit engineers. the purpose of this mostly tutorial paper is to illustrate the applications of integral manifolds to explain various non-linear phenomena widely observed in non-linear circuits. Numerous examples and graphical illustrations are included in order to present the theory with a minimum amount of mathematics. 相似文献
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Hmurcik L.V. Hettinger M. Gottschalck K.S. Fitchen F.C. 《Education, IEEE Transactions on》1990,33(2):183-189
A plan is presented for integrating SPICE (simulation program with integrated circuit emphasis) into an undergraduate electronics curriculum. Three design projects for students are described: a network theory project, an analog electronics design course, and a senior thesis project. In the first project used in a first course on network theory, the emphasis is on simple programs that can extend basic techniques (such as Thevenin's equivalent circuit) to cases where hand analysis is long and tedious. In the electronics course, the application of the bipolar-junction transistor and field-effect transistor is more clearly understood by the student when he/she constructs an analog amplifier according to a given set of specifications. Creativity is encouraged, since the design of the amplifier is flexible as long as the specifications are met. In the senior thesis project, SPICE, along with other computer design packages, enables the student to analyze and modify a project before it is constructed. This saves valuable construction time and allows for a more thorough theoretical analysis 相似文献
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Trivedi M. McShane E.A. Vijayalakshmi R. Mulay A. Abedinpour S. Atkinson S. Shenai K. 《Education, IEEE Transactions on》2002,45(1):57-64
An integrated power electronics curriculum has been implemented in the Department of Electrical and Computer Engineering at the University of Illinois, Chicago. This paper describes the development of a set of hands-on laboratory experiments to accompany classroom lectures. Content is based on switching converter topologies and commercial power semiconductor devices. Unlike most experiments, which focus on circuit- or control-level characteristics, our approach emphasizes the circuit-device-load interactions. The concept presented is innovative in that it creates a 3×3 matrix of experiment variation-devices, circuits-control, and machines-loads-with one set of hardware. The lab development is ongoing with future experiments to address three-phase converters and motor control applications. Experiment content is described, as well as the means by which the material has been integrated within the course sequence. Lab station construction and safety issues are also addressed. The experiments require hands-on measurement and circuit connection and complement the established course elements of theory and computer-based circuit modeling. Laboratory experiments and computer simulations collectively provide quantitative evidence of mixed circuit and device optimization 相似文献
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提出了一种用晶闸管三相全控整流电路用作三相Y接对称性电阻性负载进行的三相交流调压电路,此调压电路由晶闸管三相全控整流电路改造而成,并分析了工作原理,给出了实验结果。结果表明,对Y接的三相对称性电阻性负载采用此调压电路实现三相交流调压,方法可行。 相似文献
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通用型IGBT变频电源的研制 总被引:8,自引:1,他引:7
提出的IGBT通用变频电源,已完成了实用化和系列化。论述了该装置的主电路,控制系统结构,以及擎住效应,变压器偏磁的抑制方法。给出了控制电路、驱动电路、保护电路的设计原则和单相4kW变频电源的主要技术指标。 相似文献
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《Education, IEEE Transactions on》1969,12(3):162-169
To make more efficient use of the computer as an aid in obtaining linear small signal circuit models, a method of successive approximation is presented and used to obtain a variety of circuit models. Several useful search strategies are presented and specific examples illustrate their use in deriving better approximations from an initial starting point. The relative merits of various search strategies are compared to furnish guidelines for future use. The modeling techniques are also applied to specific resistor and transistor characterization problems. The hybrid-pi model for the transistor is developed in a way which allows considerable flexibility in the inclusion of parasitic effects. A final example models a practical amplifier at frequencies up to UHF. 相似文献