A Method for Calculating Frequency Regulation Reserve Requirements Considering Renewable Energy Expansion Plans

As the penetration of RES is increasing rapidly to reduce the green house gas emission, there are concerns that the variability of RES, which is highly weather-dependent, would amplify the variability of the power system in terms of balancing electricity supply and demand. A frequency regulating reserve has been operated to respond to such variability in the power system and its requirements is calculated by analysing the history data of the electiricity demand. However, existing methods do not consider variability of RES, which should be estimated considering the expansion plan of RES for the future power system. In this paper, a method is proposed to calculate the frequency regulating reserve requirements of the power system with a high penetration level of RES. For doing this, the variabilities of electricity demand and RES respectively derived from those history data are projected to the future power system, and the required amount of the frequency regulating reserve is statistically calculated to respond those variabilities. The effectiveness of the proposed method is verified through study cases employing Korean power system developed for the basic plan of long-term electricity supply and demand.