Unit Commitment Enabled Inertial Lower Bound Estimation for a Realistic Power Grid

With the increase penetration of renewable energy sources (RES), The inertia of the power system decreases and approaches the inertial lower bound gradually. This paper presents a method to evaluate the inertial lower bound of the system under different unit commitment. At the outset, a unit commitment-enable frequency response model is proposed and verified in realistic power grid. This model is based on the improvement of system frequency response (SFR) model and adopts the first-order governor model. Then, based on the proposed model, the inertial lower bound of the power grid constrained by frequency is derived. Finally, the method proposed in this paper is applied to estimate the inertial lower bound of power grid in southwest China under different unit commitment.