VOLTAGE STABILITY INVESTIGATION OF GRID CONNECTED WIND POWER PLANT

Abstract

At present, it is very common to find renewable energy resources, especially wind power which is connected to distribution systems. The impact of this wind power on voltage distribution levels has been addressed in the literatures. The majority of this work deals with the determination of the maximum active and reactive power that is possible to be connected on a system load bus, until the voltage at that bus reaches the voltage collapse point. It is done by the traditional methods of PU curves reported in many references. Theoretical expression of maximum power limited by voltage stability transfer through a grid is formulated using an exact representation of distribution line with ABCD parameters. The expression is used to plot PU curves at various power factors of a radial system. Limited values of reactive power can be obtained. This paper presents a method to study the relationship between the active power and voltage at the load bus to identify the voltage stability limit. It is a foundation to build a permitted working operation region in complying with the voltage stability limit at the Point of common coupling (PCC) connected wind power plant.