Run bulk photovoltaic inverter connected to the grid system feasible region Evaluation Method

The present invention is a high capacity PV inverter system access feasible region grid operation evaluation method, characterized by, comprising a photovoltaic power system rated capacity and a junction point voltage as a reference value to calculate the access photovoltaic grid impedance per unit a quantitative index value as a measure of the strength of the grid; stability margin according to a given controller constraints deduced running the impedance value of power per unit represented feasible domain boundary; access to photovoltaic power flow equations are established based on flow equations the relationship between the solution and the grid impedance is adjusted in accordance with a given access constraint point voltage is derived to meet the appropriate domain boundary constraint feasible to run the impedance value of power per unit represented by the photovoltaic inverter in order to determine the grid system access Operating status. A clear evaluation system, scientific and rational, and simple process.