Multi-objective PID Controller Based on NSGA-II Algorithm with Application to Main Steam Temperature Control

PID controller is widely used for main steam temperature control of boiler unit in thermal power plant. To avoid the drawback of current PID design methods, this paper presents a new design method for multi-objective PID controller to synthetically consider system requirement in speediness, reliability and robustness. NSGA-II algorithm with the elite strategy is applied to the parameter optimization design. The simulation results on an actual main steam temperature control system indicate that, the multi-objective PID controller designed by presented method, can improve the dynamic performance of main steam temperature control system, with good robustness and anti-interference ability.