Research on Inertia Allocation Scheme for Improving Frequency Safety and Stability Characteristics of Power Grid

Abstract

With the increase in the proportion of new energy power generation and DC power generation outside the region, the inertia demand under the frequency security constraints is becoming more and more urgent. Firstly, the relationship between the frequency response characteristics of the power grid and the total inertia of the system and the relationship between the frequency distribution characteristics of the multi-machine system and the inertia distribution are analyzed. Aiming at the frequency safety constraints of the power grid, an estimation method for the minimum inertia demand of the system is proposed. Considering the frequency distribution characteristics of the power grid and the distribution of load, new energy and direct current, the distribution scheme of inertia among different regions in the synchronous power grid is proposed to guide the arrangement of the power-on and output of the synchronous units in the system. The simulation analysis based on the actual large power grid in East China power grid shows that for the power system with large amount of new energy generation and DC feed, the method can effectively reduce the maximum deviation of frequency and the difference of time-space distribution, which verifies the effectiveness of the proposed method.