Impact of STATCOM and HSFCL on the performance of distance relays in transmission network

Abstract

In this paper, the effect of installing a hybrid superconducting fault current limiter on the apparent impedance seen by the distance relay in power systems compensated with STATCOM has been analyzed. The STATCOM is installed in the system to meet the increase in electricity demand and increase the capacity of the transmission line. Installing STATCOM in the system increases the level of short circuit current, which is recommended to use HSFCL to control this current. Installing STATCOM and HSFCL changes the amount of impedance calculated by the distance relay. The STATCOM location can be before or after the fault location. Its location and distance from the relay have effect on the performance of the protection systems. The HSFCL location, can be before or after the voltage transformer has effect on the performance of the protection systems also. The fault type, fault location and fault resistance are other parameters that have been investigated in simulation studies. The HSFCL has two structures, RHSFCL and LHSFCL, both of which have been studied in this paper. The two modes have been compared also. The system is modeled and simulated with different equipment in PSCAD / EMTDC software and the results are discussed.

Keywords

• "
• distance relays"
• transmission line'
• hybrid superconducting fault current limiter'
• '
• statcom'