This paper analyzes the research status of traditional power electronic transformer modeling and control strategies, as well as limitations for medium and high voltage distribution network of power electronic transformer modeling and control strategy. According to the analysis above, based on the working characteristics of the resonant converter, a unified reduced order modeling and single-level control strategy is proposed for the high-voltage power electronics transformer. Such strategy owns a simpler topology and more effective control ability. Compared with the traditional power electronic transformer modeling approach and control strategy, the proposed control strategy utilizes the work characteristics of high-frequency isolated converters, high-frequency transformer-isolated converter in conjunction with front-end cascaded as a whole, it simplifies the control system, so that it will not be more complicated with the number of modules increase. Finally, a 10 kV power electronic transformer topology and its control feasibility of the strategy are verified in PSCAD simulation environment.