Load grid-connected and off-grid switching method based on current inner loop sharing of energy storage converter

The invention discloses a load grid-connected and off-grid switching method based on current inner loop sharing of an energy storage converter. The method comprises the steps that: 1, the energy storage converter works in a PQ control mode in a grid-connected state; 2, the energy storage converter works in a V/f control mode in an off-grid state; and 3, the energy storage converter is switched from the PQ control mode to the V/f control mode at the moment of grid-connected and off-grid switching, the two control modes share one set of current inner loop, and the outlet voltage of the energy storage converter does not have sudden change of amplitude and phase based on the control characteristics of the current inner loop. In the prior art, the PQ control and V/f control of a traditional energy storage converter are two sets of independent control systems, flicker or overshoot of phase and amplitude of grid-connected voltage and current is certainly brought about at the moment of grid-connected and off-grid swi