Inertia Assessment in Power Systems with High Penetration of Converter-Interfaced Generations Considering Power Limits

Inertia assessment is of important for frequency stability analysis in power systems. Typically, the total inertia of all devices in the system is summed up to obtain the system inertia. However, the result may be optimistic when there are a considerable amount of converter-interfaced generations (CIGs). If the CIGs saturate under large disturbances, their inertia to be provided will be significantly lowered. To this end, this letter proposes a method to assess system inertia considering the power limits. Then, the distribution of system inertia under uncertain power limits is also analyzed. Simulations are conducted to validate the analysis.