A two-layer control system for load tracking of supercritical thermal power unit furnace system

Abstract

The invention discloses a double-layer control system for load tracking for a supercritical thermal power unit turbine-boiler system. The double-layer control system comprises an upper-layer controller and a lower-layer controller, and is characterized in that the upper-layer controller is an economic linear model predictive controller (ELMPC), the lower-layer controller is an L1 adaptive controller; the ELMPC builds a local linearized model with disturbing items of the turbine-boiler system, plans an optimal state and an output track of the system in a future period of time by taking the optimal economy in the future period of time as a target, acquires a corresponding optimal control variable, and transmits the optimal control variable, the corresponding optimal state of the system and the output track to the lower-layer controller; and the lower-layer controller is an L1 adaptive controller, and the L1 adaptive controller adds an adaptive correction value on the basis of the control variable planned by the upper-layer controller according to the optimal state and the output track which are transmitted by the upper-layer controller and an actual unit state and an output measurement value so as to be used for updating a prediction model of the upper layer.

Description

technical field [0001] The invention belongs to the field of thermal power engineering and automatic control, and relates to a coordinated control method for a supercritical thermal power unit, in particular to a double-layered coordinating supercritical thermal power unit which adopts economical predictive control and L1 self-adaptive control. Control System. Background technique [0002] Coordinated control of thermal power units refers to comprehensive control of boilers and steam turbines as a whole to meet the requirements of the power grid for load tracking of thermal power units. Compared with subcritical thermal power units, the coordinated control of supercritical thermal power units is mainly different in that supercritical units can only use once-through boilers because the parameters of working fluid water exceed the critical parameters of water. Since the once-through boiler does not have the energy-working medium buffer link of the steam drum, the energy-worki...

AI Technical Summary

Problems solved by technology

The problem with this design method is that traditional lower-level disturbance eliminators often use MPC or PID algorithms. These algorithms are sensitive to the actual dynamic deviation of the controlled object from the nominal model, which makes the tracking effect on the optimized trajectory poor.

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