Wind turbine generators (WTG) is predicted to play a prominent role in the electric power systems of the future. Connection of wind turbine generators to the distribution network increases power sources and therefore increases reliability of distribution network. Assessment of reliability of distribution network connected to wind turbine generators based on two state model yields big errors due to dependence of wind source capacity on wind speed which is a variable value. For more accurate assessment results, the article proposes to utilize multi-stage model of wind source reliability and switch section partitioning based on reliability on distribution network.

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There are a lot of wind power plants based on double feed induction machine technology which are connected to electrical network. These usually don't consider reactive power (even reactive power consumption), so they generally affect the entire network voltage stability and can cause instability in themselves and become no longer balanced by the torque. This paper presents a method to study the relationship between the active power and voltage at the point of common coupling (PCC) connected wind power plant to identify the voltage stability limit. It is a fundament to define a permitted operation region in complying with the voltage stability limit at the PCC connected wind power.