Optimal reserve evaluation for the system inertia in the future Korean power system considering high penetration of RES

As the penetration level of renewable energy sources (RESs) increases, the decrease in the system inertia and spinning reserves will be one of the major challenges for the secure operation of power systems. Recently, in order to secure power system frequency with in the limit defined in the grid code, accurate analysis 011 the frequency responsive reserves is getting important. In this study, method of evaluating the minimum level of inertia along with the required reserves to secure system frequency is developed. Furthermore, maximum allowable penetration level of RESs is analyzed in order to secure frequency after a sudden loss of a single generator unit. And with the evaluated minimum inertia for the secure frequency, this study shows the amount of the increased generation and the system frequency response in the time frame after a single generator or two generator units are tripped off. I11 the developed method, increase in RES penetration is illustrated as a negative load while considering the merit order of conventional generators. A case study is conducted 011 the future Korean power system of 2024.