Electric energy conversion control method and device

The invention discloses an electric energy conversion control method, the method is applied to an electric energy conversion system, and the electric energy conversion system comprises a system controller, a power conversion unit and a switching unit. According to the method, a wider output voltage range can be realized without developing a brand new power conversion unit, the full-scene charging requirement is met, huge capital, manpower and time cost can be saved, and product authentication does not need to be carried out again; moreover, the voltage coverage ranges of the series connection mode and the parallel connection mode have a relatively wide overlapping region, so that a non-power interruption switching function with higher cost is not needed, and the switching cost is lower; besides, the method provided by the invention can improve the conversion efficiency of the system, and the voltage range in the working mode cannot be exceeded in the charging process of any vehicle type, that is, the working