Evaluation of Minimum Safety Inertia of New Energy Power System Considering Rate of Change of Frequency

Due to the rapid development of the new energy power system, the increase of new energy permeability, and the grid-connected new energy inverter does not have the inertia support ability, so the frequency stability of the system is seriously affected, and the frequency indicators are gradually close to the safety boundary. In order to solve this problem, this paper first summarizes the inertia index of conventional units, and combs out the effective calculation method of inertia of conventional units. Secondly, this method is extended to the inertia estimation of the new energy power system to evaluate the inertia of the new energy power system. Then, considering the minimum safety inertia evaluation of new energy power system constrained by the rate of change of frequency, the minimum safety inertia coefficient of new energy is defined and taken as the evaluation index. Finally, the IEEE 10-machine 39-node New England Power system model is used to verify the effectiveness of the proposed method.