Wind Power Penetration Effect on Unscheduled Interchange Rate in an Indian Power System under Availability Based Tariff

Under the Availability Based Tariff (ABT) environment, the conventional generators and the power consumers participate in the frequency linked pricing to maintain the grid frequency discipline. Incorporation of the wind power in an interconnected power system triggers the frequency deviation and the tieline power deviations. A thermal-hydro-wind-diesel/biomass hybrid power system has been chosen for the investigation with Unscheduled Interchange (UI) based secondary frequency control for the conventional generators and with the primary frequency control for the wind turbine generator. Intermittency of wind power input restricts its participation in the Unscheduled Interchange (UI) based secondary frequency control. This paper studies the effect of increase in the wind penetration on the UI charge rate and the marginal cost of the conventional generators under ABT regime using MATLAB/Simulink model. It observed that with the increase of wind power penetration, the conventional generators reduce their generation with lower marginal costs. It is also observed that the settling time of the frequency deviation plot increases with more wind in the interconnected system.