Hybrid back-to-back intelligent soft switch topological structure, control system and control method

The invention discloses a hybrid back-to-back intelligent soft switch topological structure, a control system and a control method; the hybrid back-to-back intelligent soft switch topological structure comprises a power converter and a load switch, wherein the power converter is composed of two power electronic converters and a common direct-current chain capacitor; the two ends of the power converter are connected into a power distribution network in parallel through an isolation transformer; the load switch and the power converter are connected in parallel to be connected into the power distribution network; under the normal working mode, only the power converter is used for regulating and controlling the power flow and voltage distribution of the distribution network system; under a line fault mode, the load switch bears a power supply recovery function, and the power converter only processes a part of the transfer power; and after the fault is cleared, all the switching power between feeder lines is contr