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5th IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace)

作者： Brodsky, Sergey A. Nebylov, Alexander V. Panferov, Alexander I. SUAI IIAAT St Petersburg Russia

ISBN: (纸本)9781538624746

The problem of measurements optimization for control of system with distributed parameters is discussed. An approach based on a modal representation of the plant with distributed parameters is considered. The limitations for the maximum permissible error of estimates of the controlled variables and for the time-averaged values of the used criteria of control quality are presented by a set of linear matrix inequalities of problem optimization of the sensor and control loads. Minimizing of the objective function associated with position and parameters of sensors is a subject to restrictions satisfies to minimal measurement costs and determines the required number, parameters and locations of sensors.

关键词： sensors actuators measurement optimization flexible vehicle distributed parameters modal representation

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Analytical Formula for the Voltage at the End of Long Cable During Withstand 5

Analytical Formula for the Voltage at the End of Long Cable ...

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5th Asia Conference on Power and Electrical Engineering (ACPEE)

作者： Pan, Wenxia Li, Ye Liu, Mingyang Sun, Kai Huang, Xuancheng Hohai Univ Coll Energy & Elect Engn Nanjing Peoples R China State Grid Jiangsu Elect Power Co Huaian Power Supply Branch Huaian Peoples R China State Grid Jiangsu Elect Power Co Jiangsu Frontier Elect Technol Co Ltd Nanjing Peoples R China

ISBN: (纸本)9781728152813

During withstand test of long cable on submarine and some special occasions, the increase of voltage at the end of the cable may endanger the insulation safety. This paper presented an analytical calculation formula for the voltage of long cable. Based on the basic distribution parameters theory of cable, we first established the cable equivalent circuit, then derived the cable transmission model and transmission matrix, and last obtained an analytical calculation formula for the voltage at the end of the cable. The accuracy of the formula is verified by simulation, and the frequency characteristic of withstand test is analyzed. The results of the simulation study show that when using the calculation formula, which can provide a reference for relevant personnel to judge whether the voltage at the end of the cable is within the safe range, so as to avoid the risk of insulation breakdown and ensure safety during the withstand test.

关键词： XLPE cable distributed parameters analytical calculation withstand test resonance frequency capacitance effect

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Research on the Key Technology of the Emission System for Semiconductor Laser Range Finder

Research on the Key Technology of the Emission System for Se...

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International Conference on Optoelectronics and Microelectronics (ICOM)

作者： Cheng, Yongjie Xin, Desheng Zhang, Jianjia Changchun Univ Sci & Technol Natl Key Lab High Power Semicond Lasers Changchun Peoples R China

ISBN: (纸本)9781467326391

The laser emitting circuit is an important part of laser range finders system, which of the characteristic directly affects the performance of laser range finders. To improve the measure distance, the ranging accuracy and atmospheric transport performance of laser ranging system, based on the analysis and measurement of the parasitic parameters about the tunnel junction multi-active region semiconductor lasers, and considering the distribution parameters by the influence of the drive circuit. By adopting PSPICE simulation software to analysis the electrical distributed parameters of the lasers and the external circuit, which how to affect the laser pulse rising edge and pulse width. On this basis, the optimized design of a narrow pulse drive source can be realized for semiconductor laser, and research the advantage and disadvantage on different arrangement packing of lasers. This paper achieves the goal which the rise time is 4ns and the peak power is 210W of the laser pulse.

关键词： laser range finders emission system distributed parameters computer simulation

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Voltage Variation Model for DC Catenary Line of a Subway System

Voltage Variation Model for DC Catenary Line of a Subway Sys...

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IEEE Manchester PowerTech

作者： Sezgin, Mustafa Erdem Gol, Murat Middle East Tech Univ EEE Dept Ankara Turkey

ISBN: (纸本)9781509042371

Considering the increasing number of electrified traction systems and changing technological advances in power electronics industry, it is required to successfully model electrified train systems. In this paper a DC catenary voltage model is proposed for a multi substation subway system. The proposed method is capable of simulating dynamic behavior of the train during different modes of operation. In this study, firstly, the electrical parameters of the system will be found to form distributed parameter model. In order to simplify analytic calculations, an approximate yet accurate solution method is proposed. Secondly, relations modeling voltage variation are linearized for improved computational performance. Finally, developed model is extended to multi substation case. Developed model is verified using real field data.

关键词： DC catenary line DC voltage variation distributed parameters electrified traction systems parameter estimation electrical FEM analysis of rail

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DC Catenary Line Modeling of Subway Systems

DC Catenary Line Modeling of Subway Systems

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IEEE-Power-and-Energy-Society General Meeting (PESGM)

作者： Sezgin, Mustafa Erdem Gol, Murat Middle East Tech Univ Dept Elect & Elect Engn Ankara Turkey

ISBN: (纸本)9781538677032

Today's technology and trend for clean energy, made electrified traction systems more and more popular around the world. As number and capacities of those systems increase, electrical modeling of those systems became a must for power quality studies and dynamic distribution system analysis. However, those models have inaccuracies due to electrical parameters and high computational burden. This paper proposes a linearized DC catenary line model for real subway systems, which has a little computational burden. Moreover, the parameter approximations employed by the method provides more accurate results. The proposed method is validated using real measurement data.

关键词： DC Catenary Line DC Voltage Variation distributed parameters DC System Analysis Electrical FEM Analysis

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Modeling of constant distributed parameter transmission line for simulation of natural and envelope waveforms in power electric networks

Modeling of constant distributed parameter transmission line...

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37th North American Power Symposium (NAPS)

作者： Gao, F Strunz, K Univ Washington Dept Elect Engn SESAME Lab Seattle WA 98195 USA

ISBN: (纸本)0780392558

A transmission line model with constant distributed parameters for the efficient simulation of diverse transients in power electric networks is proposed. The novelty of the model lies in its capability to simulate both natural waveforms as observed in reality and envelope waveforms that modulate AC carriers. To achieve the bridging between natural and envelope waveforms, the model processes analytic signals whose Fourier spectrums can be shifted. The shift frequency is introduced as a simulation parameter in addition to the time step size. Interpolation is used to obtain results when the wave propagation time between both ends of the line is not an integer multiple of the time step size of the simulation. The model is implemented in a nodal analysis based simulator and validated through the study of the energization of a transmission line.

关键词： algorithms companion model distributed parameters electromagnetic transients electromechanical transients power system simulation power system transients transmission line

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M-Model: A New Precise Medium-Length Transmission Line Model

M-Model: A New Precise Medium-Length Transmission Line Model

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IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Al-Roomi, Ali R. El-Hawary, Mohamed E. Dalhousie Univ Dept Elect & Comp Engn 1459 Oxford St Halifax NS B3H 4R2 Canada

ISBN: (纸本)9781728154428

Real transmission lines are translated into mathematical models using either the lumped parameter approach or the distributed parameter approach. The first one is used for short- and medium-length transmission lines, while the other is used for long-length transmission lines where the accuracy and precision are required. For medium transmission lines, the lumped parameter approach can be applied using one of four popular circuit representations known as gamma (Gamma), opposite-gamma (Gamma), tee (T), and pi (Pi). This study presents a new circuit representation called em (M). This model is inspired by the sagging phenomenon where, at the sag point, the distributed series impedance of the Pi-model is divided into two equal/unequal parts and the distributed shunt admittance at the center is bigger than that at both ends. For some numerical experiments, the M-model shows a stunning performance in estimating transmission line readings. It wins in most cases and, for the few remaining cases, the M-model shows very competitive results.

关键词： telegrapher's equations distributed parameters lumped parameters transmission lines line modeling

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Crosstalk Noise Analysis for distributed Parameter High-Speed Interconnect Lines Based on the Transfer Function

Crosstalk Noise Analysis for Distributed Parameter High-Spee...

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20th Chinese Control and Decision Conference

作者： Ji, Xiaopeng Ge, Long Han, Xiaodong Wang, Zhiquan Nanjing Univ Sci & Technol Coll Automat Nanjing 210094 Jiangsu Peoples R China

ISBN: (纸本)9781424417339

A system model of high-speed interconnect lines with distributed parameters is deduced in time domain. Transfer functins from the exciting voltage to the voltage of the end of the aggressive line and both end of the victim line are set correspondingly, and the problem of crosstalk noise is studied from the systematic aspect under the circumstance that the interconnect system is excited by high-speed signal. Simulation results demonstrate that the method we proposed is of great accuracy, validity and universality compared with the numerical method, and will be very useful for improvement design.

关键词： Crosstalk analysis distributed parameters Transfer function High-speed interconnects

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Diagnostic Signs of Transient Signals in Power Lines 7

Diagnostic Signs of Transient Signals in Power Lines

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7th International Conference on Engineering and Emerging Technologies (ICEET)

作者： Khuziashev, Rustem Kuzmin, Igor Ircagalieva, Iluza Kazan State Power Engn Univ Kazan Russia

ISBN: (纸本)9781665427142

The results of modeling the transient process on the simplest models of power transmission lines are considered. Linear models with lumped and distributed parameters are investigated. The emergence of various oscillation modes of the transient signal in a multi-circuit model of a power line with lumped parameters is analyzed. The main mechanisms of the formation of the transient process signal during switching in the model of a power transmission line with distributed parameters are considered. On the basis of experimental registrations of the transient process signal, the simplest modal analysis algorithm is proposed, based on the measurement of the values of the half-periods of signal oscillations.

关键词： transient process equivalent circuit lumped parameters distributed parameters diagnostic signs modeling

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The stability postulate of N.G. Cetaev and the augmented model validation

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IFAC-PapersOnLine 2017年第1期50卷 7450-7455页

作者： Răsvan V. Department of Automation and Electronics University of Craiova A.I.Cuza 13 Craiova RO-200585 Romania

The stability in the sense of Lyapunov turned to be a most important property for equilibria and global trajectories of the dynamical systems. The so-called Stability Postulate of N.G. Četaev states that only those trajectories and equilibria which are at least stable in the sense of Lyapunov are observable and measurable. On the other hand any mathematical model of some real (physical) process requires validation in order to be self consistent as a mathematical object, also to fit to data obtained from experiments (at least basically). Combining standard validation criteria for self consistency (existence, uniqueness, data dependence) with the Stability Postulate, also with other requirements will lead to the so-called augmented model validation for self consistency i.e. as a mathematical object. Since these new concepts (like the Stability Postulate) define a methodology they have to be checked on applications (as Četaev did). Therefore, there will be considered a case of energy co-generation described by conservation laws. © 2017

关键词： distributed parameters Energy control Model validation Stability Postulate

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