Feedforward-Feedback Temperature Control Strategy for Heating Furnaces Based on Joint Identification and Desired Closed-Loop Response

As a core thermal equipment in the metallurgical industry, the temperature control accuracy of heating furnaces directly affects the quality and efficiency of steel rolling production. To address the limitations of traditional PID control in handling large inertia, pure delay, and disturbances from incoming billet temperature fluctuations, this paper proposes a feedforward-feedback control strategy based on joint identification and desired closed-loop response. First, the process model, disturbance model, and lumped residual disturbance model of the furnace are simultaneously identified through optimized experimental design. Subsequently, PID parameters are analytically calculated based on desired closed-loop response characteristics (e.g., rise time, overshoot), while a feedforward compensator is designed using the disturbance model to suppress incoming temperature disturbances. Experimental results demonstrate that the proposed method significantly improves dynamic response speed and disturbance rejection capability, effectively reducing temperature deviations while ensuring stability.