This paper presents a technique to spot installation harmonics in period of time mistreatment signals obtained from grid connected power electronic converters. The projected harmonics estimation has potential applications in distributed energy systems; the theoretical and experimental analysis of the changed SEPIC device is given during this paper. The projected device operates in DCM. Because the device operates in DCM it acts as a voltage follower id est. the input current follows the input voltage. The voltage across the switch is reduced. Furthermore a digital management technique is employed to scale back the third harmonic input current distortion. Finally, 100W power issue correction circuit was developed with associate operational potency of ninety eight.