Application of PID(Proportional,Integral and Differential)Parameter Setting Based on a Genetic Algorithm in a High-temperature Multiphase Flow Wind Tunnel

A high-temperature multiphase flow wind tunnel can simulate gas-solid two-phase flow conditions during the operation of a boiler,facilitating the study of flow characteristics and testing methods.To better control the technical parameters of the wind tunnel,PID(proportional,integral and differential)controllers were adopted in the main control loops of the wind tunnel and the PID parameters were set based on a genetic algorithm.The choice of the target function based on the genetic algorithm and the concrete operations of the genetic algorithm were described in detail with the option operations being coupled with optimum preservation tactics.By using software Matlab,a simulation was performed of the PID parameter setting of temperature control objects based on the genetic algorithm.The set PID parameters were used for on-site commissioning test,and kp=0.2173,ki=0.4505 and kd=0.0758 were obtained after a tiny correction.During the test,the maximal dynamic deviation of temperature was 1 ℃,thus attaining a good control quality.