Method, device and medium for grid-connected modeling of multi-stage distributed photovoltaic cluster

Abstract

The application relates to the technical field of photovoltaic power generation, in particular to a multi-stage distributed photovoltaic cluster grid-connected modeling method and device, equipment and medium, wherein the method comprises the following steps: simplifying photovoltaic grid-connected models corresponding to all photovoltaic units in the multi-stage distributed photovoltaic cluster to obtain simplified models; establishing a parallel equivalent model of the multi-stage distributed photovoltaic cluster, and determining an actual dynamic characteristic level of the multi-stage distributed photovoltaic cluster when being connected to a power grid; when the actual dynamic level is greater than a preset level, the multi-stage distributed photovoltaic cluster is connected to the power grid, otherwise the actual structure of the multi-stage distributed photovoltaic cluster is optimized according to the actual dynamic level until the actual dynamic level is greater than the preset level. Therefore, the problems that in the related art, a photovoltaic grid-connected model control structure for an electromechanical transient time scale is complex, there are many control parameters, the model parameters are difficult to obtain through an identification method, and the dynamic characteristics of the multi-stage distributed photovoltaic cluster after being connected to the power grid cannot be accurately described are solved.

Images