Mohsen Abedini - Department of electricity management, savadkooh branch, Islamic Azad University, savadkooh , Iran
Fatemeh Geraeli Khormaee - Department of electricity management, savadkooh branch, Islamic Azad University, savadkooh , Iran

In recent years the problems of voltage stability of power systems that operate near the limits of stability and a large amount of power transferred from extended areas, increased. The exact set-point voltage breakdown with voltage stability analysis fast lane and symptoms properties, allowing operators to take measures to prevent such incidents do. Although various methods are used in voltage stability analysis. Successful avoid voltage collapse point, reliance on the accuracy, speed and time calculations signs are low. This paper presents a method for the analysis came to the line voltage in the power system is stable. This method is developed, accurate and easy to find and to theoretically determine the breaking point voltage transmission line voltage stability in any way accurate. Voltage stability margin can be calculated easily and includes symptoms that indicate how much transmission of load status is safe. And allow the line if it is extremely stressful, do a separate analysis. The proposed method is shown a system 14bus IEEE and compares it to existing methods in terms of effectiveness and efficiency in the system.

voltage stability analysis, stability margin index of voltage stability, voltage collapse