Research and analysis of dynamic equivalence of power system

In recent years, with the expansion of power grids, power system interconnection has also expanded. However, it brings many problems to the operation and management of power systems. The dynamic equivalence of power system is a kind of equivalent method of power system, which can keep the area of power system that needs to be studied unchanged and simplify the external area equivalently. Dynamic equivalence is divided into the cohomology equivalence method, the model equivalence method and the equivalent method of estimation. The dynamic equivalence of large-scale power system can improve the calculation accuracy, reduce the computational complexity and greatly improve the grid efficiency. This paper summarizes the dynamic equivalent methods of power systems in recent years, introduces the ideas and methods of various methods, and carries out the simulation analysis. (paper)