Frequency characteristics analysis of power system under determined new energy penetration rate considering different start-up methods and frequency modulation participation degree

The current research paradigm for the frequency stability analysis of power systems is generally based on exploring the conditions of different new energy penetration rates. There is a lack of deep theoretical analysis on the frequency characteristics of power systems under the determined new energy penetration rate conditions. Under the determined new energy penetration rate, factors such as the start-up methods and frequency modulation depth of the power supply can also significantly affect the frequency characteristics. Based on the above, this study explores the problem of frequency characteristics analysis of power systems under determined new energy penetration rates considering different start-up methods and frequency modulation participation degrees. By calculating and analyzing the different system equivalent inertia formed by the heterogeneous power supply with different frequency modulation participation degrees and start-up methods/operation conditions, we discover the analytic solution and influence regularity of the frequency response under the condition of the determined new energy penetration rate. Finally, an arithmetic system was used to verify the correctness of the calculation method used in this study.