Study on the Frequency Dynamics Distribution Characteristics Considering the Disturbance Power and the Inertia Distribution

The large-scale penetration of renewable energy such as wind power and photovoltaic decreases the frequency regulation capability of the power system, leading to an increased risk of frequency instability and the difference of frequency dynamic distribution have become increasingly prominent. Therefore, it is necessary to study the influencing factors that cause the difference of bus frequence distribution characteristics. In this paper, the disturbance power propagation model is established according to the disturbance mechanism. And a bus inertia distribution model based on Gaussian distribution is proposed. Finally, two factors are combined to obtain the expression of rate of change of frequency. The simulation results show that the frequency distribution characteristics of each bus in the grid are related to the distribution of bus inertia and the propagation of disturbance power.