Voltage Stability Study of the Iraqi Power Grid

Abstract

It has become an important task for many voltage stability studies to find avoltage stability index. The voltage stability indices provide reliable informationabout proximity of voltage instability in a power system. In this paper, the Lindicator has been proposed, which aims to detect the weakest load buses in theelectrical power networks. The L indicator has been checked by its application tothe (WSCC 9-bus and IEEE 14-bus) test systems. Finally, the proposed indicatorhas been applied to the Iraqi power grid (400 kV) considering differentcontingencies, such as lines outage, generated power reduction and loadingincrease. The short computation time of this indicator and its efficient detection ofthe weakest load buses in the Iraqi power grid, allow the operators to apply it in onlinevoltage stability monitoring based on measurements.