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This paper presents a method for predicting the flicker level that is generated by the high-power load in a distribution system. Through the development of the Flickermeter that met the International Electrotechnical Commission requirements, a reference curve is obtained based on the variation of voltage and the amount of changes per minute of the load. The purpose of this prediction is to determine if the load operation will produce flicker before being connected to the electrical system. This analysis cannot be developed by power system software due to the Flickermeter complexity and the amount of data that is required for processing. [ABSTRACT FROM PUBLISHER]

A design procedure to select the components in a modular unified power-quality conditioner configuration based on single-phase cells is presented. The procedure is based on the fact that the load and distributor operating conditions range are known and it is required to impose stiff operating conditions in both the load side (regulation) and the point of common coupling side (power factor). Due to the arbitrary number of cells to be used in a modular approach, the proposed design procedure allows to select the power semiconductors and capacitors based on an economical evaluation, so an optimal number of cells can be chosen to minimize the overall power cell cost. This design procedure is well suited for modular configurations, where several degrees of freedom are not covered if just technical criteria are followed. Thus, an economic approach can be used to select the appropriate components. The rest of the devices, i.e., the transformers turn ratio and passive filters, are chosen using classical design methods based on technical issues such that the power cells operate within its permissible ratings. A practical case evaluation is presented for a medium voltage system application. [ABSTRACT FROM AUTHOR]

Presents an analysis of a voltage sag compensator for critical loads in electrical power distribution systems. Conceptual design of the proposed approach; Topology of the pulsewidth modulation ac-ac converter; Details of the simulation and experimental results.

This paper presents the performance analysis of a hybrid filter composed of passive and active filters connected in series. The analysis is done by evaluating the influence of passive filter parameters variations and the effects that different active power filter's gain have in the compensation performance of the hybrid scheme. The compensation performance is quantified by evaluating the attenuation factor in a power distribution system energizing high-power nonlinear loads compensated with passive filters and then improved with the connection of a series active power filter. Finally, compensation characteristics of the hybrid topology are tested on a 10-kVA experimental setup. [ABSTRACT FROM AUTHOR]