Dynamic Equivalent Modeling of Photovoltaic Grid-connected Power Generation System

Considering the time-varying nature of the power system, in order to realize the dynamic modeling of photovoltaic power plants, based on the analysis of the grid-connected structure of PV system, the engineering model of the photovoltaic array and the value of some parameters in the MATLAB calculation example are used. The inverter efficiency was corrected to establish a dynamic model of the output of the photovoltaic inverter. The error analysis was carried out with reference to the actual photovoltaic power station, and the error of the built dynamic model was within the allowable range, which proved the accuracy of the model. The deduction of the output dynamic characteristics of the photovoltaic inverter provides a basis for the subsequent research to model the comprehensive load of photovoltaic access to the distribution network.