30 research outputs found
An Approach to the Multivectorial Apparent Power in Terms of a Generalized Poynting Multivector
The purpose of this paper is to explain an exact derivation of apparent power in n-sinusoidal operation founded on electromagnetic theory, until now unexplained by simple mathematical models. The aim is to explore a new tool for a rigorous mathematical and physical analysis of the power equation from the Poynting Vector (PV) concept. A powerful mathematical structure is necessary and Geometric Algebra offers such a characteristic. In this sense, PV has been reformulated from a new Multivectorial Euclidean Vector Space structure (CGn-R3) to obtain a Generalized Poynting Multivector ( ~ S). Consequently, from ~ S, a suitable multivectorial form ( ~ P and ~D) of the Poynting Vector corresponds to each component of apparent power. In particular, this framework is essential for the clari¯cation of the connection between a Complementary Poynting Multivector (~D) and the power contribution due to cross-frequency products. A simple application example is presented as an illustration of the proposed power multivector analysis
VICARED: A Neural Network Based System for the Detection of Electrical Disturbances in Real Time
The study of the quality of electric power lines is usually known as
Power Quality. Power quality problems are increasingly due to a proliferation
of equipment that is sensitive and polluting at the same time. The detection and
classification of the different disturbances which cause power quality problems
is a difficult task which requires a high level of engineering knowledge. Thus,
neural networks are usually a good choice for the detection and classification of
these disturbances. This paper describes a powerful system for detection of
electrical disturbances by means of neural networks
Considerations on the non-active power using geometric algebra
Several approaches have been developed to define the non-active power concept under nonsinusoidal situations in electrical systems. Nevertheless, these contributions do not provide a complete and satisfactory solution to the non-active power reversibility between frequency domain and time domain. This paper presents a non-active power multivector concept, based on an original vector space frequency-domain approach that bridges the gap between both domains. The suggested correspondence can provide a convenient descriptive language to reconcile Fryze’s instantaneous non-active power with Budeanu´s deactive-power
Continuous harmonic analysis and power quality measurements in three-phase systems
A virtual instrument, named Power Quality
Meter, is presented for (a) measuring power consumption and
harmonics in three-phase systems, under non-sinusoidal and
imbalance conditions (b) detecting, classifying and organizes
power disturbance events. Measurement of the power
consumption follows the formulation proposed by the members
of the IEEE Working Group on Nonsinusoidal Situations
(1996). So, definitions are based on the analysis of functions in
the frequency domain, separating the fundamental terms from
the harmonic terms of the Fourier series. The virtual instrument
has been developed too for monitoring and measuring power
disturbances, which are automatically classified and organized
in a database while they are being recorded. Software tools use
the database structure to present summaries of power
disturbances and locate an event by severity or time of
occurrence. Records of actual measurements are included to
demonstrate the versatility of the instrument
Wavelet and Neural Structure: A New Tool for Diagnostic of Power System Disturbances
The Fourier transform can be used for analysis of nonstationary signals, but the Fourier spectrum does not provide any time-domain information about the signal. When the time localization of the spectral components is needed, a wavelet transform giving the time-frequency representation of the signal must be used. In this paper, using wavelet analysis and neural systems as a new tool for the analysis of power system disturbances, disturbances are automatically detected, compacted, and classified. An example showing the potential of these techniques for diagnosis of actual power system disturbances is presented
Random Generation of Arbitrary Waveforms for Emulating Three-Phase Systems
This paper describes an apparatus for generating a
signal representative of steady-state and transient disturbances
in three-phase waveforms of an ac electrical system as described
in IEEE Std 1159-09. It can be configured as a synthesizer of
randomly distorted signals for different applications: for testing
the effects of disturbed grid on equipment and to generate patterns
of electrical disturbances for the training of artificial neural
networks, which are used for measuring power quality tasks. For
the first purpose, voltage and current amplifiers are added in the
output stage, which allows the generation of disturbed signals at
grid level.Comisión Interministerial de Ciencia y Tecnología DPI2006-15467-C02-01Comisión Interministerial de Ciencia y Tecnología DPI2006-15467-C02-0
Instantaneous current vectors in polyphase systems: two compensation concepts
6 páginas, 9 figuras, 24 referencias.-- Trabajo presentado al Modern Electric Power Systems (MEPS) International Symposium, celebrado del 20-22 de septiembre 2010, en Wroclaw, Polonia.According to the target of minimal line losses and a power factor equal to one, the present work studies two concepts of instantaneous compensation of nonactive current which are generally applied to polyphase systems. The analysis is defined both on the basis of the instantaneous value concept, for arbitrary voltage and current waveforms, and on the basis of the average value concept, for steady-state and periodic conditions. Results of using these concepts for instantaneous compensation are compared by simulation.Peer reviewe
Wavelet-Fourier analysis of electric signal disturbances
The Fourier transform usually has been used in the past for analysis of stationary and periodic signals. Its interest is the knowledge of spectral components existing in a waveform; it doesn't matter the moment where they happen. However, when the time localization of the spectral components is needed, the Wavelet Transform (WT) can be used to obtain the optimal time frequency representation of the signal. In this paper, the joint wavelet-Fourier transform has been proposed for detecting, analyzing and compacting electrical disturbances. Finally, results of experiments have been included
Generador de patrones eléctricos (GPE)
Generador de patrones eléctricos (GPE).
El generador de patrones eléctricos (GPE) es un siste ma capaz de generar una secuencia de patrones clasifi cados, dentro de un conjunto global, en subconjuntos de
patrones de un mismo tipo. El conjunto global se corres ponde con las infinitas perturbaciones existentes en las
ondas de tensión de una red eléctrica trifásica. Los sub conjuntos se corresponden con cada uno de los tipos de
perturbaciones que se han detectado en la red eléctrica
europea de baja tensión. Estos subconjuntos se denomi nan: armónicos, flicker, hueco, sobretensión, transitorios,
desviación de frecuencia, ruido y disimetría. El GPE es
capaz de crear de forma automática un número ilimita do de los patrones correspondientes a cada uno de estos
subconjuntos de infinitos elementos.Españ
Reviewing concepts of instantaneous and average compensations in polyphase systems
According to the target of minimal line losses and a power factor that is equal to one, this paper studies two concepts of instantaneous compensation of nonactive current which are generally applied to polyphase systems. The analysis is defined both on the bases of the instantaneous-value concept, for arbitrary voltage and current waveforms, and the average-value concept, for steady-state and periodic conditions. The results of using these concepts for instantaneous compensation are compared by simulations.Peer Reviewe