Direct current micro grid topology design method based on DC-DC (Direct Current-Direct Current) sectionalizers

The invention provides a direct current micro grid topology design method based on DC-DC (Direct Current-Direct Current) sectionalizers and belongs to the technical field of micro grid. In an annular direct current micro grid topology, a plurality of direct current micro grid sectionalizers based on high frequency isolation DC/DC conversion (short for DC-DC sectionalizers) are arranged for replacing solid circuit breakers. A direct current micro grid wire frame is of an annular structure, and an annular busbar is divided into a plurality of segments and a plurality of voltage levels. Adjacent busbar segments are connected through the DC-DC sectionalizers or circuit breakers so as to form a power supply layout with multiple segmentations and multiple connections. The DC-DC sectionalizers are of a dual full bridge topology structure, and are subjected to alternating current coupling through high-frequency transformers. The direct current micro grid topology design method has the advantages that on the aspects such as electric isolation, power flow control and connection among busbars with different voltage levels, the method has obvious superiority, the response speed is rapid and the sensitivity is high. When a direct current busbar or device has a fault, the DC-DC sectionalizers are not affected by capacitance instantaneous discharge, the faulted busbar is isolated, the power failure range is reduced as far as possible, and the reliability of the system is improved.