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Inertia Characteristic Analysis and Inertia Estimation of New Energy Power System

As more and more renewable energy generations and distributed energy sources are connected to the power system, the characteristics of power system inertia have changed. In order to realize the stable operation of new energy power system, the inertia of new energy power system needs to be analyzed and evaluated. The article firstly defines a new definition of system inertia, which contains different forms of inertia and describes each inertia in detail; then proposes a power system inertia evaluation method based on kinetic energy theorem and a disturbance time location method based on wavelet transform, which does not need to measure the rate of the change of frequency (ROCOF). In addition, the distribution characteristics of power system inertia is studied and the inertia distribution of the system is visualized to provide more reference information for the safe, stable and flexible operation of the new energy power system. Finally, the effectiveness of the method is verified by simulation in the IEEE 39-bus system in DigSILENT/PowerFactory environment.