Effect of Active Power Injection on the Voltage Stability Margin of a Power System

The great demand of energy has increased considerably these last decades. Consequently, many problems have emerged. Among these problems, voltage stability that can generate many disturbances and voltage collapses. Injection of an active power can improve the voltage stability of the power system. In this paper, active power-voltage (PV) and reactive power-voltage (QV) curves are used in voltage stability analysis of the IEEE 9bus system before and after the active power injection. The effect on the different buses’ voltage and stability margin of the system is shown on the results’ section. The simulation of the system is carried out on MATLAB environment.