Active-disturbance-rejection controller, system and method for main steam temperature cascade of thermal power plant

Abstract

The invention discloses an active-disturbance-rejection controller, system and method for main steam temperature cascade of a thermal power plant. The controller comprises a tracking differentiator, an expansion state observer, nonlinear state error feedback and three operation units. The system comprises a subsidiary controller, an executor, a subsidiary controlled object, a main controlled object, a subsidiary transmitter and a main transmitter. According to the method, the influence of disturbance factors such as loads and injection flow can be effectively overcome through the specific disturbance compensation effect of the active-disturbance-rejection control system. The active-disturbance-rejection controller, system and method integrate the advantage of cascade control and the advantage of network control and further have the advantage of the active-disturbance-rejection control system; the active-disturbance-rejection controller, system and method have great advantages in the aspect of model disturbance estimation, and with the help of the nonlinear error control law specifically for nonlinear objects, good control precision is still achieved even if control conditions are quite severe, and the adjustment quality is improved; and accordingly, the requirements of practical production are better met.

Description

technical field [0001] The invention belongs to the technical field of thermal power plants, and in particular relates to a cascaded active disturbance rejection controller for main steam temperature of a 600MW supercritical unit of a thermal power plant, a system and a method. Background technique [0002] With the increasing demand for energy, thermal power generation is developing in the direction of high automation. In order to improve the quality of electric energy, higher requirements are put forward for the control quality of thermal power units. In actual production, the control object of the thermal power unit has the characteristics of large delay, large inertia and strong nonlinearity, which makes the main steam temperature control become the most important control, which is related to the safe operation of the entire unit. [0003] At present, the design method of the main steam temperature cascade control system of the 600MW supercritical unit in the thermal po...

AI Technical Summary

Problems solved by technology

In actual operation, due to the continuous adjustment of the controller, the frequent operation of actuators such as control valves will reduce their service life, so the present invention proposes a new method to solve this problem

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