Impact of renewable energy resources on frequency of a power system based on mathematical approach

Renewable Energy Sources (RES) are the energy sources of the future. However, RES have negative impacts on system's frequency stability because of their intermittency and low inertia characteristics. While intermittency property results in power balance in the system, which is reason for frequency variation, low inertia characteristic influences frequency change such as Rate of Change of Frequency, the minimum and maximum values of the frequency. This paper focuses on these influences of RES on frequency variation when a power imbalance occurs in the system according to mathematical theory. The results obtained show similarities with studies using simulation tools or events occurring in operational practice.