Statistical summation of the harmonic currents produced by a large number of single phase variable speed air conditioners: a study of three specific designs

Gorgette, Frederic; Lachaume, J.; Grady, W.M.

doi:10.1109/61.871358

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…The same approach has been adopted for further nonlinear loads via simulation based on both analytical models [19][20][21] and time-domain based models of the individual appliances [22][23][24]. A similar approach has also been followed in [25] where the positive effects of harmonic cancellation due to the combination of single-and three-phase nonlinear loads are illustrated.…”

Section: A3 Experimental Results For Several Loadsmentioning

confidence: 99%

Appendix A: Time‐Varying Harmonic Currents from Large Penetration Electronic Equipment

Ribeiro

2009

Time‐Varying Waveform Distortions in Power Systems

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The international literature of this sector has not yet covered time-varying harmonic absorption of electronic equipment in detail, even though the ever increasing penetration of such equipment makes the prediction of harmonic impact an urgent problem.In order to investigate time-varying behavior of harmonic spectra adequately specific harmonic monitoring systems are required which allow a continuous recording of harmonic quantities [1][2][3][4]. Specific and quite expensive commercial products or custom-made equipment are required.The continuous monitoring can be of a certain utility but also for low-demand single-phase nonlinear loads, since this practice allows a better characterization of harmonic spectra and an improved understanding of the impact due to the various stages of typical operation as well. To this end, some selected results which were obtained from a wide monitoring activity performed in the laboratory over the last few years are reported [5][6][7][8][9].The measurement activity can be performed by using customized monitoring equipment with the simplified scheme illustrated in Figure A1.The equipment permits the simultaneous and synchronous sampling of multiple singlephase voltage and current signals by using two different acquisition boards dedicated to voltage and current channels, respectively. Details of the equipment characteristics are reported in [5][6][7][8][9].This appendix deals with the characterization of time-varying harmonic currents from large penetration electronic equipment. The time-varying characterization of single-phase Time-Varying Waveform Distortions in Power SystemsEdited by Paulo F. Ribeiro

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Section: A3 Experimental Results For Several Loadsmentioning

confidence: 99%

Appendix A: Time‐Varying Harmonic Currents from Large Penetration Electronic Equipment

Ribeiro

2009

Time‐Varying Waveform Distortions in Power Systems

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“…In this table, the displacement power factor is given (dPF), which describes the power factor using the fundamental frequency components only [17]. The nonlinear loads are simulated based on the research presented in [18].…”

Section: Influence Of Inverter Controlled Dg Unitsmentioning

confidence: 99%

Power quality improvements through power electronic interfaced distributed generation

et al. 2010

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Abstract-In low-voltage distribution networks a large amount of single-phase nonlinear loads are connected. This leads to the combined presence of power system unbalance and harmonic distortion. The research presented in this paper focusses on these steady-state power quality problems. It uses a harmonic load flow program, implemented in symmetrical components, to investigate the influence of several single-phase inverter control strategies used to connect any kind of primary energy source to the grid. The influence of these single-phase distributed generation units in the three-phase four-wire distribution network is discussed by means of two recently formulated indicators that combine the power system unbalance and the existing harmonics.

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“…Desgraciadamente, los estudios y modelos desarrollados en la literatura y comentados anteriormente no han sido validados experimentalmente, o bien su validación ha sido realizada a partir de un número reducido de medidas. Entre estos estudios experimentales se pueden destacar [8], [9] y [22][23][24][25][26][27][28][29].…”

Section: Antecedentesunclassified

“…No obstante, estos estudios han llevado también a la necesidad de analizar fenómenos particulares del comportamiento de las cargas no lineales como son la cancelación y la interacción armónica, los cuales deben de tenerse en consideración cuando se desea calcular de forma correcta la distorsión armónica de la intensidad. El primero consiste en la disminución del valor eficaz de la intensidad armónica total consumida por un conjunto de cargas no lineales debido a los desfases existentes entre las intensidades armónicas individuales consumidas por cada una de las cargas que constituyen el conjunto [5, 9,24,[29][30][31]. El segundo consiste en la influencia de las tensiones armónicas en bornes de las cargas no lineales sobre las intensidades armónicas consumidas por dichas cargas [6,17,32,33,39].…”

Section: Antecedentesunclassified

“…El fenómeno de la cancelación armónica consiste en la disminución del valor eficaz del h-ésimo armónico de la intensidad total consumida por un conjunto de cargas no lineales debida a los desfases existentes entre los también h-ésimos armónicos de las intensidades consumidas individualmente por cada una de las cargas no lineales que integran dicho conjunto. Estos desfases se deben a la diversidad de las fases del h-ésimo armónico de intensidad propiciada por la distinta naturaleza o por el distinto valor de los parámetros de las cargas no lineales integrantes del conjunto, [5, 9,24,[29][30][31]. Así, el fenómeno se produce cuando las intensidades armónicas de una determinada frecuencia están en oposición de fase o próximas a ella y, por tanto, la suma geométrica de dichas intensidades es mucho menor que su suma aritmética.…”

Section: Estudio Del Fenómeno De La Cancelación Armónicaunclassified

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Estudio y caracterización de cargas no lineales

Mesas¹

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As a continuation of the work done by the QSE (Electrical Supply Quality) research group at the UPC (Polytechnic University of Catalonia) on non-linear load modelling to determine harmonic distortion in electrical power systems, this thesis consists of the carrying out of a series of studies of the most usual non-linear loads in the said systems (single-phase and three-phase rectifiers with capacitive filter, three-phase 6-pulse rectifiers and discharge lamps), basically aiming to characterize their behaviour and assess their influence on electrical power systems. The thesis was prepared in cooperation with the GNOM (Group of Numerical Optimization and Modelling) research group at the UPC in order to be able to analyse the numerical problem raised by the system of non-linear equations which characterizes each of the non-linear loads, as well as being able to approach optimization issues with some certainty of success. In summary, the aims of this thesis are as follows: -To analyse modelling of the most usual four non-linear loads in electrical power systems in order to incorporate the invariant concept in a justified way and establish ranges of values for the said invariants depending on their usual operating conditions. -To exploit the possibilities offered by invariants and, on the basis of the ranges of values obtained for each of them, to proceed to characterize the deterministic behaviour of the non-linear loads which are the object of the study and also to analyse the phenomena of harmonic cancellation and interaction. -To describe and study experimentally, also on the basis of invariants, the fundamental and harmonic currents (magnitude and angle) consumed by the non-linear loads considered in this thesis, whether by obtaining experimental models (databases) validated both experimentally and numerically, by validating the studied analytical models experimentally or by fitting the parameters of any of the previous models (parameter estimation) on the basis of experimental acquisitions. -To study the neutral conductor current in three-phase systems to which single-phase non-linear loads are connected (in particular, single-phase rectifiers with capacitive filter), by using invariants and validating the results of this experimentally. Como continuación de los trabajos realizados por el grupo de investigación QSE (Calidad del Suministro Eléctrico) de la UPC (Universidad Politécnica de Cataluña) sobre modelización de cargas no lineales para la determinación de la distorsión armónica en los sistemas eléctricos de potencia, se ha realizado como tesis una serie de estudios sobre las cargas no lineales más habituales en dichos sistemas (rectificadores monofásicos y trifásicos con filtro capacitivo, rectificadores trifásicos de 6 pulsos y lámparas de descarga) encaminados básicamente a la caracterización de su comportamiento y al análisis de su influencia en los sistemas eléctricos de potencia. La tesis se ha desarrollado en colaboración con el grupo de investigación GNOM (Grupo de Optimización Numérica y Modelización) de la UPC para poder analizar el problema numérico planteado por el sistema de ecuaciones no lineales que caracteriza cada una de las cargas no lineales, así como poder abordar con garantías problemas de optimización. Resumidamente, los objetivos de esta tesis son: -Analizar la modelización de las cuatro cargas no lineales más habituales en los sistemas eléctricos de potencia con el objetivo de introducir de forma justificada el concepto de invariante y establecer rangos de valores para dichos invariantes de acuerdo a sus condiciones habituales de funcionamiento. -Aprovechar las posibilidades que ofrecen los invariantes y, a partir de los rangos de valores obtenidos para cada uno de ellos, proceder a caracterizar el comportamiento determinístico de las cargas no lineales objeto de estudio y también a analizar los fenómenos de la cancelación y la interacción armónica. -Caracterizar y estudiar experimentalmente, también a partir de los invariantes, las intensidades fundamental y armónicas (módulo y ángulo) que consumen las cargas no lineales consideradas en esta tesis, ya sea mediante la obtención de modelos experimentales (bases de datos) validados tanto experimental como numéricamente, la validación experimental de los modelos analíticos estudiados o bien el ajuste de los parámetros de cualquiera de los anteriores modelos (estimación de parámetros) a partir de adquisiciones experimentales. -Estudiar la intensidad del neutro en sistemas trifásicos en los que hay conectadas cargas no lineales monofásicas (en particular, rectificadores monofásicos con filtro capacitivo), utilizando los invariantes y validando experimentalmente los resultados que se obtengan.

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Statistical summation of the harmonic currents produced by a large number of single phase variable speed air conditioners: a study of three specific designs

Cited by 14 publications

References 3 publications

Appendix A: Time‐Varying Harmonic Currents from Large Penetration Electronic Equipment

Appendix A: Time‐Varying Harmonic Currents from Large Penetration Electronic Equipment

Power quality improvements through power electronic interfaced distributed generation

Estudio y caracterización de cargas no lineales

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