The once-through steam generator(OTSG)of floating nuclear power plant has a small steam-water volume and heat storage capacity,and the steam pressure fluctuates greatly when there are external disturbances and load changes,so it is difficult for the PID controller based on the local model to achieve good control in the whole operating range.Therefore,based on the system identification method,the transfer function models of OTSG under different operating conditions are obtained.The trapezoidal membership function is used for weighting,and a fuzzy model under all operating conditions suitable for OTSG steam pressure control is established.The linear active disturbance rejection controller(LADRC)is applied to the outer loop of OTSG to form a cascade control system.Combined with frequency domain analysis method,the LADRC engineering parameter adjustment law of OTSG steady-state operation and variable-condition operation is given,and the parameters are adjusted on this basis,and the performance is compared with PID cascade control system.The simulation results show that compared with PID cascade control,LADRC cascade control has faster response speed,smaller control error,stronger anti-interference and robustness.
Floating nuclear power plantOTSGFrequency domain analysisLADRC
维普
万方数据
