Topological structure of power electronic transformer

The invention discloses a topological structure of a power electronic transformer, and relates to the technical field of transformers. The topological structure comprises voltage input equipment, a power electronic transformer, a power management system, a pre-start detection unit, a control unit, a fault detection unit, a fault analysis unit and a fault feedback unit. Before the power electronic transformer is started to work, the transformer can be subjected to pilot operation before working through the pre-starting detection unit, and operation data is called from data through the previous operation data calling module, so that whether the transformer can work normally or not can be found in time, and then the situation that the power transformer needs to stop working for maintenance when the power transformer breaks down during working is avoided; the fault detection unit can extract the real-time working data of the transformer through the information extraction module, retrieves the data of the transformer during normal operation through the original data retrieval module, compares the data through the data comparison module, and then can detect the existing working condition of the transformer.