Voltage stability assessment for radial distribution power system with wind power penetration

Integration of wind power may enhance the performance of power systems. This paper presents the impacts of wind power penetration on the operation of a radial distribution power system. A 37-bus radial system is studied. Continuation power flow (CPFLOW) is performed on the system without wind power and with gradually increasing a rate of wind power penetration. The wind turbine is connected to bus 35 which is the weakest bus. The wind turbine is modelled in as PQ generator, as the wind park is typically regulated with constant power factor. Voltage stability for the radial power system is determined by the corresponding PV curves for each bus with and without wind power. The effects of wind power penetration on the active power losses of the whole system as well as the voltage collapse with loading parameters are investigated. Changing the power factor by connecting a parallel capacitor is also considered. The simulation analysis was performed by PSAT/MATLAB simulation package. The analysis shows the benefits of introducing wind power to radial distribution systems by decreasing the active power losses and hence increasing the system efficiency. Voltage collapse was found to occur at higher loading factor which enhances the voltage stability of the system. Finally, the steady state bus voltages became higher than without wind penetration.