Application-Oriented Comparison of Quade, FBD and an extension of the CPC Power Theory

Abstract:
The complexity of todays electrical power grids, especially regarding the increasing amount of power electronic devices, causes power quality concerns to remain a central topic of discussion. Power theories constitute a fundamental theoretical basis for the analysis in this field. This article compares the applicability of three distinct theories for practical concerns such as power system analysis and compensation strategy evaluation. The three theories are the Fryze-Buchholz-De-penbrock (FBD) time domain, the Quade vector-based and the Characteristic Current Components (CCC) frequency-domain definitions. The CCC is a seven-component extension to the well-known Currents’ Physical Components by L.S. Czarnecki. All methods use different methodological approaches and implications leading to different fields of applica-tions. Measurements of a real arc furnace and a compensator test bench are used to reveal and discuss the strength and weaknesses of each theory with regard to practical application. Combinations of the theories under discussion provide the means to design advanced control schemes for STATCOM assets in order to further improve power quality.