Selective active filter applied to an arc furnace adjusted to harmonic emission limitations

This paper describes how to calculate the dif-ferent harmonic sequences that should be filtered with ashunt selective active filter, for two control alternatives: load current measurement or line current measurement. These results are then generalized for shunt hybrid selective filters. Passive parameters are chosen considering the resonances with the electric system that appear. Design basis are defined in order to obtain a minimum cost filter which also meet the applicable regulations requirements. Finally, results showing the potentiality of the selective filter controlled for the proposed methods are reported

Selective active filter with remote harmonic distortion control

PostprintThis paper presents the calculation methods for the different filtering blocks of a selective active filter in order to minimize the active filter inverter size, keeping the harmonic emissions at the limits stated by the applicable regulations. Since it may be necessary to comply with the regulations at a remote place with respect to the active filter location, the method has been extended to this case. In order to validate the simulations, measurements which were made at a real application - and arc furnace - were used. Finally, the simulated results obtained with a remote hybrid filter were compared with those obtained when an active filter is installed directly at the place where the harmonic emission regulations must be met. The comparison shows that remote compensation is an alternative to be seriously considered. The results are similar to those obtained with local compensation and the cost may be substantially lower

Simenerg: the design of autonomous systems

This work describes a methodology and a software tool-kit (SimEnerg) for the design of autonomous electricity systems. A criterion for comparing autonomous against grid connected systems is given, based on the annual energy deficit of the system with a given confidence. As an example, a map for choose the best technology with given power demand and the geographical position in Uruguay is shown. The modeling of the wind velocity and the solar radiation as a stochastic sources are described

Filtro activo instantáneo de corrientes armónicas : FAICA

Proyecto I+D (llamado CSIC 1999)Objetivos generales y específicos. Realizar un aporte significativo a la teoría de los filtros activos en cuanto a la caracterización de los armónicos de corriente a partir del últimamente revalorizado concepto de la potencia instantánea y su descomposición en componentes activa, reactiva y armónicas como funciones en el dominio del tiempo. Este enfoque es especialmente apto para la compensación eficiente en forma dinámica de efectos no lineales en la red, tarea hasta ahora realizada en forma parcial mediante sistemas pasivos y modelos en el dominio de la frecuencia. Desarrollar técnicas modernas de control en tiempo real de los filtros activos. Lograr contar en el país con el conocimiento necesario a los efectos de contribuir a la solución técnica práctica del problema planteado, conocimiento que permita comprender todos los aspectos involucrados, las diferentes opciones tecnológicas, la evolución futura de las mismas y la capacidad de diseño y especificación de requerimientos para su posterior implementación en la Industria Nacional o Regional

Filtro activo de mínimo costo ajustado a la carga de un horno de arco y a las reglamentaciones sobre emisión armónica aplicables

En este trabajo se presenta una forma de diseñar un filtro activo shunt utilizando la teoría de la potencia activa y reactiva instantánea adaptándose a la reglamentación aplicable en cuanto a límites de emisión armónica permitida. Se analiza la Reglamentación Argentina, se compara con las recomendaciones de la IEEE, se modela la carga típica con la que debería lidiar el filtro, que en nuestro caso es un horno de arco industrial. Luego analiza aspectos del diseño del filtro pasa altos interno del filtro activo que separa que frecuencias de la corriente se eliminan y cuales no. Finalmente se llega a valores característicos constructivas del filtro activo como ser tensiones nominales, su capacitor en el bus de continua y corrientes máximas por las llaves

Series and parallel calculations methods for the reference current values in a selective shunt active filter

In this paper, the input/output transfer functions involved in a selective filtering using shunt active filters are analyzed. Their dependence on the employed control method for harmonic current filtering is studied. When performing selective filtering of harmonic sequences, the I/O transfer functions may have non-real terms. For those cases, a suitable frequency-domain analysis method, which takes into account both positive and negative current sequence filtering, is presented. The calculation procedure for the active filter reference current is then analyzed. The series and parallel calculation methods are presented and compared. The advantages of each method depending on the use of load or line current control are shown. The interference between the different filtering blocks obtained by using both series and parallel calculation methods is also shown

Control strategies of selective harmonic current shunt active filter

PostprintThis paper presents the possible calculation methodologies in orden to design a selective shunt active filter. For realizing to selective extraction of harmonic sequences the modulation - filter - demodulation technique is used. The fundamental equations of this method are established in the case of pq theory showing its equivalence with the SRF (Synchronus Reference Frame) method. In order to prove the proposed ways of calculation real non-periodic currents data with a great harmonic distortion of an arc furnace are used, with the good results achieve shows the ability of filtering in a selective and controlled way the undesired current harmonics