Authors: Kotipalli Vineela Chandrika and Palakaluri Venkatesh
Flexible AC Transmission System (FACTS) became very popular for control of power flow in transmission lines. The Load changes the voltage Variation in transmission lines must be limited, otherwise the consumer’s equipments are damaged at distributed side. For reducing this voltage variation a FACTS device called Distributed Power Flow Controller (DPFC) and Distributed Interline Power Flow Controller (DIPFC) is used. The DPFC is derived from the unified power-flow controller (UPFC). The DPFC (Distribute Power-Flow Controller) modified from UPFC for increasing system reliability and reducing costs. The DPFC can be considered as UPFC with an eliminated common DC link, to enable the independent operation of the shunt and the series converters which enhances the effective placement of the series and shunt converters. The active power exchange between the two converters, which is through the common dc link in the UPFC, is now through the transmission lines at the third-harmonic frequency in the DPFC and DIPFC. In DPFC three-phase series converter is divided to several single-phase series distributed converters through the transmission line and in DIPFC three single phase series converters are placed in between the two transmission lines. This paper consists of both active and reactive variations, using MATLAB/SIMULINK is simulated and its effects on the transmission lines observed. The simulated results are analyzed and validated with the real time results for the system considered.
FACTS, DPFC, DIPFC, UPFC, Power Quality
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