Research on the Generalized Load Modeling of Distribution Grids with Distributed Photovoltaics and Parameter Identification Method

With the widespread integration of distributed photovoltaic power generation systems into the distribution network, traditional load modeling methods are no longer able to accurately describe their dynamic characteristics. The article introduces the current research status of synthesis load model, including the modeling of distribution networks containing distributed photovoltaics. Based on this, a dynamic equivalent model of distribution networks is established that comprehensively considers the dynamic characteristics of load and distributed photovoltaic power generation systems. Firstly, the load model of the equivalent photovoltaic power generation system is connected to the virtual bus of the synthesis load model, thereby establishing a generalized load model for the distribution network; Afterwards, important parameters were screened using the dynamic trajectory sensitivity method, and key parameter identification based on particle swarm optimization algorithm was achieved on the MATLAB/Simulink simulation platform, completing the equivalence of the distribution network. Finally, the simulation results show that the proposed distribution network dynamic equivalent model can accurately describe the dynamic characteristics of distributed photovoltaic power generation systems widely integrated into the distribution network. More importantly, in the background of distributed photovoltaic power generation system widely connected to the distribution network, the dynamic equivalence of the distribution network provides a guarantee for the fast and accurate transient simulation calculation of the transmission network.