Control method for flexible interconnection between DC microgrids

The invention relates to the technical field of power electronics, in particular to a control method for flexible interconnection between direct-current microgrids, which comprises the following steps of: calculating a current rated value of a step-up/step-down inductor L; according to the calculated rated current value of the step-up/step-down inductor L, judging which working condition the flexible interconnection switch is in, and if the rated current value of the step-up/step-down inductor L is greater than 0, determining that the flexible interconnection switch works in a step-down mode; if the current rated value of the step-up/step-down inductor L is smaller than 0, determining that the flexible interconnection switch works in a step-up mode, wherein the direction of the specified current flowing from the step-up/step-down inductor L to the positive electrode of a low-voltage side direct-current micro-grid bus or the positive electrode of a low-voltage capacitor CL is positive; and respectively designi