Impacts of a Distributed Power Flow Controller on the Performance of Distance Protection

EasyChair Preprint no. 1306

Abstract

In this paper, the performance of a distance protection relay is investigated in the presence of a Distributed Power Flow Controller (DPFC) in a transmission system. The DPFC is derived from the Unified Power Flow Controller (UPFC). The differences are that the common DC-link has been eliminated and the three-phase series converter has been divided into several single-phase series converters distributed through the transmission line. In order to analyze the effects of a DPFC on distance protection relays, different types of line faults are simulated at various locations using the EMTDC/PSCAD_­­^® software and comparing the measured impedance at the relaying point in the presence of the DPFC with a UPFC. The simulation results show the effects of the magnitude and phase angle of the voltage injected by series converters on the performance of a distance relay. The research indicates that the under/over-reaching of the distance relay is due to the zero sequence of voltage injected by the series converters of the DPFC. This has the most significant effect on the apparent impedance measured by the phase-to-ground fault measuring unit. This research also illustrates that fault resistance affects the measured impedance at relay points in the presence of the DPFC.

Keyphrases: Distance relay, Distributed flexible alternating current transmission system, DPFC

@Booklet{EasyChair:1306,
  author = {Ali Baniasadi and Masoud Barakati and Saeed Tavakoli and Masoud Nouri},
  title = {Impacts of a Distributed Power Flow Controller on the Performance of Distance Protection},
  howpublished = {EasyChair Preprint no. 1306},

  year = {EasyChair, 2019}}