Akademik Veri Yönetim Sistemi
INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS, cilt.31, sa.11, 2021 (SCI-Expanded)
The power system inertia based on the kinetic energy stored in synchronously connected rotating machines has a crucial effect on the frequency stability. As long as the use of renewables is increased, the share of conventional generators in electrical energy generation is decreased. Thus, the existing rotational inertia in the power system is reducing day by day. Therefore, planning the daily generation schedule according to a realistic inertia estimation has become a vital requirement for modern power systems. In this context, this article deals with the change and the effect of the inertia in a power system under different seasonal conditions. Firstly, the inertia constant of Turkish transmission grid is estimated hourly from January to October 2019 by using real system data in order to reveal how the inertia changes under different generation plans. For this purpose, the aggregated model approach in which a total inertia constant is estimated for whole power grid by using inertia constant of each generation unit and the actual generated power of resources is used. Then, six major system disturbances occurred in 2019 are analyzed by utilizing real frequency data measured by phasor measurement unit (PMU) devices. Considering the share of renewable energy in the realized generation at the time of these disturbances, rate of change of frequency (RoCoF) analysis, and inertia calculations are made. As the main contributions, the article clearly illustrates how the inertia contributes to the frequency stability during system failures under different generation conditions. Furthermore, a realistic inertia study is presented, which has never been carried out for Turkish transmission grid. Moreover, real system data obtained from PMU devices during the real disturbances is used instead of using standard bus systems.