scholarly journals The Invariance Determination of the Complex Electrical System Output of

2021 ◽  
Vol 264 ◽  
pp. 01024
Author(s):  
Tokhir Makhmudov
Keyword(s):  
Dynamic Systems ◽  
Matrix Theory ◽  
Controller Synthesis ◽  
Electrical System ◽  
Electrical Systems ◽  
System Output ◽  
System Mode ◽  
Small Disturbances

This article discusses the issues of applying the technology of embedding systems to study the invariance of the output of complex controlled electrical systems under small disturbances as stationary deterministic multidimensional dynamic systems. The technique of controller synthesis based on the modern matrix theory is presented. The synthesis of the regulator of the model of a multi-machine electrical system is obtained, which makes it possible to analyze the influence of the parameters of the electrical system mode.

Crosstalk in Electrical Connectors

2021 ◽  
Vol 3 (3) ◽  
pp. 54-59
Author(s):  
Van Tai NGUYEN ◽  
◽  
Vladimir Y. Kirillov ◽  
Keyword(s):  
Frequency Band ◽  
Electromagnetic Interference ◽  
Experimental Studies ◽  
Electrical System ◽  
Electrical Wire ◽  
Electrical Systems ◽  
Efficient Reduction ◽  
External Electromagnetic Fields ◽  
Resonance Nature ◽  
Electrical Connectors

Crosstalk electromagnetic interference occurs in on-board electrical wire bundles of aircraft electrical systems under the effect of external electromagnetic fields. Efficient reduction of crosstalk and elimination of their propagation paths in wire bundles can be achieved by shielding the conductors in the bundles and the bundles as a whole without breaks and discontinuities between the shields and housings of electrical connectors. The shielding of conductors in bundles does not eliminate the crosstalk completely, which can propagate through the contacts of electrical connectors. For estimating the influence of electrical connectors on the levels of crosstalk in electrical system circuits, their experimental studies should be carried out. In the course of these experimental studies, the interference voltage induced at the receptor contacts when voltage is applied to the source contacts in the specified frequency band is measured. The results from experimental studies of crosstalk for various types of electrical connectors in a specified frequency band make it possible to evaluate the resonance nature and levels of crosstalk interference levels depending on the relative position of the contacts and frequency.

scholarly journals An Optimized HT-Based Method for the Analysis of Inter-Area Oscillations on Electrical Systems

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2935 ◽  
Author(s):  
Francesco Bonavolontà ◽  
Luigi Pio Di Noia ◽  
Davide Lauria ◽  
Annalisa Liccardo ◽  
Salvatore Tessitore
Keyword(s):  
Phasor Measurement Unit ◽  
Measurement Unit ◽  
Frequency Interval ◽  
Electrical System ◽  
Characteristic Parameters ◽  
Electrical Systems ◽  
Electromechanical Oscillations ◽  
Simulated Experiment ◽  
Novel Method ◽  
The Individual

The paper deals with a novel method to measure inter-area oscillations, i.e., electromechanical oscillations involving groups of generators geographically distant from one another and ranging within the frequency interval from 0.1 Hz up to 1 Hz. The estimation of the parameters characterizing inter-area oscillations is a crucial objective in order to take the necessary actions to avoid the instability of the transmission electrical system. The proposed approach is a signal-based method, which uses samples of electrical signals acquired by the phasor measurement unit (PMU) and processes them to extract the individual oscillations and, for each of them, determine their characteristic parameters such as frequency and damping. The method is based on Hilbert transformations, but it is optimized through further algorithms aiming at (i) improving the ability to separate different oscillatory components, even at frequencies very close to each other, (ii) enhancing the accuracy associated with the damping estimates of each oscillation, and (iii) increasing the robustness to the noise affecting the acquired signal. Results obtained in the presence of signals involving the composition of two oscillations, whose damping and frequency have been varied, are presented. Tests were conducted with signals either synthesized in simulated experiment or generated and acquired with actual laboratory instrumentation.

Spectral Moments Calculation of Linear System Output

1983 ◽  
Vol 50 (4a) ◽  
pp. 901-903 ◽  
Author(s):  
P-T. D. Spanos
Keyword(s):  
Dynamic Systems ◽  
Random Vibration ◽  
Linear Equations ◽  
Spectral Moments ◽  
Linear Dynamic Systems ◽  
Linear Dynamic ◽  
Improper Integral ◽  
System Output ◽  
Noise Input ◽  
Stable Linear

The stationary output of a stable linear dynamic system to white noise input is considered. It is shown that the spectral moments of the output can be determined as the solution of a set of linear equations. The corresponding solutions are utilized for determining an improper integral which can be quite useful in random vibration analyses of linear dynamic systems.

Model Verification of Mixed Dynamic Systems

1978 ◽  
Vol 100 (2) ◽  
pp. 266-273 ◽  
Author(s):  
J. D. Chrostowski ◽  
D. A. Evensen ◽  
T. K. Hasselman
Keyword(s):  
Experimental Data ◽  
Parameter Estimation ◽  
Dynamic Systems ◽  
Statistical Parameter ◽  
Model Verification ◽  
Passive Networks ◽  
Parameter Values ◽  
Basic Configuration ◽  
General Method

A general method is presented for using experimental data to verify math models of “mixed” dynamic systems. The term “mixed” is used to suggest applicability to combined systems which may include interactive mechanical, hydraulic, electrical, and conceivably other types of components. Automatic matrix generating procedures are employed to facilitate the modeling of passive networks (e.g., hydraulic, electrical). These procedures are augmented by direct matrix input which can be used to complement the network model. The problem of model verification is treated in two parts; verification of the basic configuration of the model and determination of the parameter values associated with that configuration are addressed sequentially. Statistical parameter estimation is employed to identify selected parameter values, recognizing varying degrees of uncertainty with regard to both experimental data and analytical results. An example problem, involving a coupled hydraulic-mechanical system, is included to demonstrate application of the method.

Determination of Subtraction Terms inS-Matrix Theory

1965 ◽  
Vol 137 (6B) ◽  
pp. B1592-B1597
Author(s):  
C. Edward Jones
Keyword(s):  
Matrix Theory

Fischerella sp. biomass measurement by using graphite electrodes

2019 ◽  
Vol 28 (6) ◽  
pp. 33-38
Author(s):  
José Martín Márquez-Villa ◽  
Juan Carlos Martínez-Espinosa ◽  
Juan Carlos Rodríguez-Sierra
Keyword(s):  
High Reliability ◽  
Electric Circuit ◽  
Dry Weight ◽  
Electrical System ◽  
Graphite Electrodes ◽  
Living Biomass ◽  
Electrical Admittance ◽  
Physical Quantities

For several decades, the electrical admittance has been very useful for the determination of physical quantities, such as the characterization of some electrical properties of interest in organic samples. In this work, an electrical system based on graphite electrodes to determine the amount of living biomass of the cyanobacteria Fischerella sp. is proposed. Cyanobacteria are phototrophic microorganisms with applications on bioremediation, pharmaceutics, medicine, among others. The strain was characterized in BG-11 medium and cultured at different biomass concentrations. Samples were evaluated by electrical admittance and contrasted by the technique of dry weight in order to correlate the results registered by the/a proposal electric circuit. Scanning frequencies from admittance went in an order from 10 Hz to 1 000 000 Hz. Also, they showed a reproducibility, getting deviations of 6.45 × 10-5. This electrical system can be used to evaluate Fischerella sp. living biomass concentrations with high reliability.

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