Inertia Evaluation for Power System Based on Quasi-Steady-State Data

With the integration of renewable energy sources, the power system equivalent inertia has dropped significantly. It is urgent to conduct the online evaluation of inertia. Current inertia evaluation methods are mostly based on the rate of change of frequency under large disturbances. In order to evaluate inertia under quasi-steady-state operation, an evaluation method is proposed based on system identification. The monitoring data under the quasi-steady-state operating conditions of the power system is acquired through the synchronous phasor measurement units (PMUs). And the PMU data including frequency and active power under small disturbances are used for the quantitative evaluation of inertia. The WSCC 9-bus system is established to verify the effectiveness of the proposed method.