Abstract: The transfer mechanism of satellite single-phase fluid loop thermal control system was analyzed and simplified.A transient thermal model including thermal modules model, controlled-object model,and control system model was developed.Aiming at the reduction of the temperature dynamic deviation caused by the larger inertia of satellite single-phase fluid loop,the heat load was taken as a feed forward control disturbance signal of satellite single-phase fluid loop on the basis of current PID control.Simulation results indicate that the feed forward PID control strategy has less disadvantage and better performance.The results can also instruct the engineering design.

Key words: Single phase fluid loop, Transient thermal model, Feed forward control, PID control, Satellite