Enhancement of Power Quality by CSC-UPQC using Fuzzy Logic Technique.

This paper presents a new unified power-quality conditioning system - UPQC), capable of simultaneous compensation for voltage and current in multibus/multifeeder systems for three-phase unified power quality conditioner based on current source converters(CSC - UPQC), including the design guidelines of the key components, an appropriate control scheme, and a selection procedure of the dc current level. Particularly, the ride through capability criterion is used to define a minimum dc current level so that the CSC-UPQC with Fuzzy technique achieves the same characteristics as a UPQC based on current-source converters in terms of voltage disturbance compensation in the point of common coupling (PCC) and load power factor compensation. A 1.17 MVA load fed from a 3.3 kV system is used to show the proposed design procedure, and a laboratory prototype is implemented to show the system compensating Harmonics, interruptions, sags and swells using low switching frequency in the CSC and maintaining a unitary displacement power factor in the PCC with ANN technique.