Alternating current and direct current micro-grid interconnection converter control method based on triple phase shift and frequency conversion control

The invention relates to the field of alternating current and direct current micro-grids, in particular to an alternating current and direct current micro-grid interconnection converter control method based on triple shift and frequency conversion control. According to the invention, the problems of non-linear power control, difficulty in design of control links, low equipment power density, large size of a voltage-stabilizing electrolytic capacitor and serious switching loss in the traditional scheme are solved. The isolated grid-connected three-phase converter is composed of a dual-active-bridge converter and a full-bridge inverter, the control flexibility is improved through a triple phase-shifting modulation mode, linear control over output power by control coordinates is achieved, and a better control effect is achieved; a voltage-stabilizing electrolytic capacitor at the direct current side of the converter is replaced by a thin-film capacitor with a smaller size, so that the design cost and the hardwar