Analytical Frequency Nadir Prediction Considering Inverter-Based Fast Frequency Response
This letter develops an analytical frequency nadir prediction method that allows for the consideration of three potential forms of fast frequency response (FFR) provided by inverter-based resources. The proposed method provides fast and accurate frequency nadir estimation after N-1 generation tripping contingencies. Our method is grounded on the closed-form solution for the frequency nadir, which is solved from the second-order system frequency response model considering the governor dynamics and three types of FFR. The simulation results in the IEEE 39-bus system with different types of FFR demonstrate that the proposed method provides accurate and fast prediction for the frequency nadir under various disturbances.
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