A Novel Transformerless Hybrid Series Active Filter

Abstract:

The proposed configuration could be connected to the grid without requiring a costly series injection transformer. This topology is capable of compensating current harmonics at the source and voltage distortion at the point of common coupling. 

Furthermore, an appropriate controller could compel the Transformerless Hybrid Series Active Filter (THSeAF) to perform as Unified Power Quality Conditioner (UPQC) with quazi-similar behavior. The transformerless configuration is more cost-effective than any other series compensators based mostly on a transformer to inject the compensating voltages. 

Moreover, as a dynamic voltage regulator, the latter will compensate unwanted harmonics, unbalances, sags, and swells at terminals of a sensitive load. When performing as a series hybrid active filter, it cleans the power system from current distortions together with harmonics and unbalances, similar to a shunt active filter.

Keywords: Unified Power Quality Conditioner (UPQC), Transformerless Hybrid Series Active Filter (THSeAF), Power Quality.