Instituto Tecnológico de Morelia

About: Instituto Tecnológico de Morelia is a education organization based out in Morelia, Mexico. It is known for research contribution in the topics: Electric power system & AC power. The organization has 498 authors who have published 572 publications receiving 4600 citations.

An Improved Time-Harmonic 2-D Eddy Current Finite-Element H Formulation

Abstract: A finite-element formulation in terms of the magnetic field intensity is developed for 2-D eddy current problems, such that the current density lies in a plane, whereas the magnetic field is normal to such a plane. This type of configuration arises in the analysis of nondestructive testing of pipes, evaluation of transformer tank wall losses, and other applications. By conserving the displacement current, even for low-frequency cases, multiply connected domains and regions with very low conductivity are easily handled. Procedures for loss evaluation, mesh adaptation, and consideration of ferromagnetic materials have been developed.

Dispositivo de automatización para un infiltrómetro de campo con funcionamiento de Mariotte

Abstract: La infiltracion es el proceso en el cual el agua pasa de la superficie hacia el interior de un medio poroso. El estudio de este proceso desde la perspectiva de la medicion directa consume gran cantidad de tiempo y dinero, debido a que requiere de toma de datos en intervalos que van de 1 a 5 min durante lapsos de tiempo entre 0.5 a 4 h. En este trabajo se presenta un dispositivo capaz de reducir la demanda de tiempo e incrementar la cantidad de datos que pueden registrarse por unidad de tiempo. El dispositivo consiste en una unidad de automatizacion digital para medir la altura de una columna de agua, que emplea un sensor de presion diferencial MPX2010DP conectado a un circuito de entrega de energia y acondicionamiento de senal con memoria no volatil programable con interfase USB. La unidad de automatizacion se acoplo a un infiltrometro portatil de carga constante y anillo sencillo. El infiltrometro automatizado tuvo una desviacion estandar de aproximadamente 0.2 cm para un rango de medicion de 0 a 85 cm. Se evaluo su funcionalidad y aplicacion en 4 sitios con suelos de textura contrastante del sur de la Cuenca del Lago de Cuitzeo. La conductividad hidraulica saturada calculada por el metodo de Wu (Wu et al., 1999), a partir de datos obtenidos automaticamente, no mostro diferencia significativa con aquella calculada a partir de datos obtenidos manualmente. Sin embargo, se observo una disminucion de la desviacion estandar del metodo automatizado, respecto del manual. Esta unidad de automatizacion permitio la adquisicion de datos de infiltracion utiles en la estimacion de propiedades hidraulicas con una supervision minima

Noise mitigation in voltage and current waveforms in harmonic distortion estimation

Abstract: Power quality deals with waveform of sine voltage. Good power quality is supplied by utilities when a perfect sine waveform is delivered. However, several adverse phenomena negatively affect the power quality, e.g. harmonic currents injected to the network. Hence, voltage and current waveforms are distorted. In order to obtain the harmonic content in voltage and current waveforms, they are captured using data acquisition systems. Unfortunately, data can be contaminated by noise. This paper analyzes how affects this noise to determine the harmonic content by an algorithm designed for this purpose such as the Fast Fourier Transform, among others, and proposes an algorithm based on moving average filter to mitigate these adverse effects. The proposed method has been tested using the modified IEEE 14 bus test system. The results show that the harmonic content obtained from low noisy voltage and current waveforms present a considerable error in harmonics of low magnitude; hence, a procedure is necessary to mitigate the noise in contaminated measurements, before they are used to obtain the harmonic content or to assess the time domain state estimation. The results suggest that by using the proposed method, the noise in measurements can be mitigated to low values, thus improving the accuracy of the harmonic content estimation.

Analytical Method for Calculating Steady-State Initial Value Conditions of Dynamic Periodic Networks with Nonlinear Components

Abstract: In electrical networks, the calculation of steady-state responses and boundary conditions are of fundamental importance. Conventionally, the steady-state can be obtained in the time domain through the solution of the resulting set of ordinary differential equations until the transient state dies-out. In many electric networks, this process can take long and computationally expensive simulation times. This article presents an analytical methodology to obtain steady-state response and boundary value conditions. The methodology is illustrated with a single-phase unloaded transformer model which includes a nonlinearity in a magnetic circuit and by a static synchronous compensator, which is a three-phase power electronic device.