Study on Small Disturbance Stability of Photovoltaic Grid-Connected Power Generation System

With the increase of the proportion of photovoltaic in the power grid, the voltage level of its connection to the grid is continuously improved, and the influence of grid-connected photovoltaic on the stability of the power system is more and more prominent. To this end, according to the actual topology of photovoltaic power station, the photovoltaic cell, inverter, controller and other components were modeled in detail, and the small signal system model of photovoltaic grid-connected system was established. The detailed derivation process of the model is given, and the representation of state matrix elements is obtained. The modes and damping characteristics of the system are studied by eigenvalue analysis, and the mechanisms of the modes are analyzed by participating factors. The influence of different controller parameters on transient stability is studied by eigenvalue locus method.