Common Mode Frequency Analysis Modeling and Quantification Method for Power System with High Penetration of Renewable Energy Generation

With the increase of the permeability of renewable energy generation in the power system, the frequency regulation capability of the system constantly deteriorates. Domestic and foreign scholars have proposed some control strategies for renewable energy generation such as wind turbines to actively participate in frequency regulation. However, current research on how to accurately evaluate the contribution of wind turbines to grid frequency regulation is insufficient. Therefore, a unified structural model is proposed to approximate the power response of various generating equipment in the grid under disturbance. Then, based on the unified structure, the common mode frequency trajectory of the system is analyzed and the frequency characteristics, including average rate of change of frequency and frequency nadir, are quantified, based on which the supporting effect of various equipment such as wind turbines on the frequency is evaluated. Finally, the effectiveness of the unified structure model and the proposed method for quantifying frequency characteristics is verified by simulation.