Frequency characteristics of hybrid filter systems

Hybrid filter topologies are becoming more important to improve harmonic performance in industrial systems. Hybrid filters are composed of active and passive filter associations taking advantage of both filter schemes. As a consequence of their complexity the analysis and design requires an optimization process to set up the most important parameters. In this paper the most important filter configurations are analyzed in the frequency domain. The analysis helps in the selection process of the main parameters, especially the value of the equivalent active filter impedance, which affects strongly the filter behavior. This study provides a good support in the analysis and design of hybrid filters.