Requirement of densely distributed PV grid-connected data analysis technology in the future new power system

The distributed photovoltaic power generation system has the characteristics of close distance load, short transmission distance, good matching with electricity load, and easy on-site consumption. Since distributed photovoltaic is distributed to all voltage levels of the distribution network if the model is based on the centralized photovoltaic power station mode and models the parallel power stations one by one, it is necessary to add the corresponding power grid model, which is lower than 110 kV in the power grid analysis data file, which will lead to simulation results. The node size increases exponentially, and the convergence of the model decreases significantly. Therefore, it is necessary to study the analysis method under the background of distributed intensive integration, decouple the distributed PV from the load, appropriately aggregate the distributed PV, control the node size, and ensure the transient and steady state. The accuracy of response characteristic simulation puts forward new requirements for electromechanical and electromagnetic simulation. Considering the photovoltaic-intensive grid connection scenario in the future new power system, the photovoltaic grid connection scale is large, and the grid connection forms and voltage levels are different. Obviously, the analytical method of establishing an accurate PV model is no longer applicable, and different integration forms of PV need to be considered. The equivalent model of large-scale grid-connected PV is based, and a multi-voltage grid analysis method suitable for intensive PV grid-connected would be proposed.