3-element controller tunning method for boiler Drum level control by least square modeling

摘要

A method for tuning the drum level controller is provided based on the least squares analysis result of the entire control loop of the three-element controller. According to an exemplary embodiment of the present invention, a three-element controller tuning method includes: acquiring, by a three-element controller tuning system, data about a steam signal and drum level according to a load change corresponding to a disturbance; modeling, by the three-element controller tuning system, the least-squares method using the data extracted from the internal transfer function and the entire multi-stage controller transfer function using disturbance as the output of the input drum level; performing, by the three-element controller tuning system, primary tuning on the flow controller transfer function (GF) to minimize the influence on disturbance; The three-element controller tuning system uses the level controller transfer function (GL) to optimally control the drum level through the simulation of the drum level change amount for the change of the drum level set point excluding disturbances in the system in which the tuning is performed. performing primary tuning for And the three-element controller tuning system performs a set point test in a state in which disturbance is considered, checks the response characteristics, and performs secondary tuning for the flow controller transfer function (GF) and the level controller transfer function (GL) including; Thereby, it is possible to apply the same method to the control system on which disturbance acts, perform system analysis and use it to optimize the controller model parameters, and induce stable power plant drum level control, thereby preventing a power plant trip or serious accident.