Voltage inversion due to presence of SSSC on adjacent lines and distance relay mal-operation

Abstract

This paper discusses the distance relay maloperation in the presence of Static Synchronous Series Compensator (SSSC), one of the series connected Flexible Alternating Current Transmission System (FACTS) device. This is done by presenting the measured impedance at the relaying point in the case of SSSC presence at the near end of the line behind. Measured impedance by distance relay is greatly influenced in the presence of SSSC on the transmission line or even in the case of installation of SSSC on the adjacent lines, near end of the line behind. Distance relay tripping characteristic depends on many factors including the power system structural conditions and the pre-fault loading, the ground fault resistance, and SSSC structural and controlling parameters.

Smart Grid Operational functions and Control Challenges by Implementing SSSC Tailored to Optimize performance in between Qatar and KSA on the GCC Electrical-power grid

“…Figure 6 displays the influence of location if counterbalance device employment on voltage profile, the voltage on left side of the counterbalance device would be VQL and right side VQR. Figure 7 illustrates that the series counterbalance device employed in the middle the worst voltage-profile occurred at each side of the counterbalance device, whereas the voltage-profile vector aligns with the current vector [5]. Therefore, the midpoint voltage-profile is the same with/without SSSC functions as exhibited in (37) and (38) SSSC power flow with = 0 [6]…”

“…Principally, the SSSC-series counterbalance device location is not very much perilous it can be employed anyplace on the GCC Electrical-power grid. In this case the SSSC has been retained at the borderline to decrease the power-line transmission impedance unnaturally by SSSC which is controlling to upsurge the power flow in the power transmission system in (5) and (6) determine how much line impedance (XC) has been Controlled and Managed after employing series but stable capacitor's Kseries factor. SSSC encompasses of capacitors and reactors to diverge the power-line impedance on domineering need basis vigorously.…”