Comparative Analysis of Online Monitoring Methods for Inertia in New Power System

Due to the decrease of inertia caused by the grid-connected large-scale new energy in the new power system, the demand to evaluate the inertia of power system has become urgent, and the on-line monitoring of inertia based on PMU measurement data is considered as an effective method at present. Three typical online monitoring methods are discussed respectively which are ordinary calculation method, integral calculation method and differential calculation method. The theoretical calculation of these three typical methods is presented. Simulation analysis is carried out by IEEE39 nodes with load increase and cutting off of generator respectively, and the characteristics of each inertia calculation method are compared and analyzed, and a conclusion that the error of ordinary calculation method is smallest and most stable among these three methods, which is recommended. It can provide reference for online calculation and analysis of inertia in the future.