Converter transformer winding temperature prediction method and system in direct current magnetic bias state

The invention discloses a converter transformer winding temperature prediction method and system in a direct current magnetic bias state, and relates to the technical field of power transformers, and the method comprises the following steps: taking the winding loss and the iron core loss of a converter transformer in the direct current magnetic bias state as heat sources, carrying out the fluid-temperature field multi-time simulation of a three-dimensional equivalent flow heat model, and obtaining a three-dimensional equivalent flow heat model; simulation results under different inlet flow rates and environment temperatures are obtained respectively; the integrated regression tree model is trained through different inlet flow rates, environment temperatures and corresponding simulation results, and various temperature prediction models are obtained; and respectively inputting different inlet flow velocities and environment temperatures in different magnetic bias states into various temperature prediction mode