Inertia evaluation method, device and equipment for single-stage photovoltaic grid-connected system and medium

The invention discloses a single-stage photovoltaic grid-connected system inertia evaluation method, relates to the technical field of grid-connected power system inertia evaluation, and is used for solving the problem of lack of a single-stage photovoltaic grid-connected system inertia evaluation calculation method in the prior art. The method comprises the following steps: obtaining electromagnetic transient characteristics, and generating a corresponding mathematical model; constructing a frequency response model according to the mathematical model to obtain an expression of system frequency response and energy released by the photovoltaic inverter; obtaining a direct current side capacitor and a droop coefficient which need to be evaluated, and calculating a moment corresponding to the lowest point of the frequency according to the expression; and according to the calculation result, the effective inertia is calculated through a synchronous generator inertia calculation method. The invention further discl