Published Paper Details:

Recently, within the family of FACTS, the distributed power flow controller is an additional device. This paper highlights on voltage sag mitigation which is one of the burgeoning power quality issues. It deals with the working concept of distributed power flow controller for compensating unbalanced three phase line currents in the transmission system. The single phase series converters of DPFC are able to compensate. The unique control capability of the UPFC is given by the back-to-back connection between the shunt and series converters, which allows the active power to freely exchange. To ensure the DPFC has the same control capability as the UPFC, a method that allows active power exchange between converters with an eliminated DC link is required. An unsymmetrical fault (L-G fault) is considered near the load end side. A proper selection of controlling variables of DPFC relieves the load voltage sag, compensates the unbalance and diminishes the load voltage harmonics in few seconds. Furthermore the performance of DPFC is simulate using Matlab simulink and results denote an improvement in power quality.