A Study on the Frequency Fluctuation in Case of High Penetration of Renewable Energy Sources

Abstract

Because of the rise of the global environment consideration, more attention is paid to the distributed generation using renewable energy sources like photovoltaic and wind power generation. However, the output fluctuates drastically according to the weather conditions like the insolation and the wind velocity. The fluctuation may have an impact on power demand and supply balance. Therefore, the daily operation and planning of a system with high penetration of the distributed generation is going to be very difficult than ever before. In order to study how difficult the demand and supply control will be, the model including a unit commitment, considering various constraints such as ramp rate and available generating capacity, is proposed. In this model, the frequency and the tie-line power flow fluctuation are calculated and used as indices to evaluate the effect of the introduction of renewable energy sources on the operation and planning of electric power system.