This paper presents the modeling and implementation of a three-phase DSTATCOM (Distribution Static

Compensator) using STF (Self Tuning Filter) based IRPT (Instantaneous Reactive Power Theory) control

algorithm for power quality improvement. It is used for harmonics elimination, load balancing and

reactive power compensation at distorted PCC (Point of Common Coupling) voltages under nonlinear

loads. An adaptive fuzzy logic controller is used to control the dc bus voltage of VSC (Voltage Source

Converter) based DSTATCOM to improve the response and to reduce the overshoot and undershoot of

traditiona