Coordinated control method for supercritical thermal power units with fusion expansion observer

Abstract

The invention discloses an extended state observer-integrated supercritical thermal power unit turbine-boiler coordinated control method. According to the method, firstly, a plurality of local linear models are established at different working condition points of a power unit through the nonlinear analysis method according to the nonlinear model of a 1000 MW supercritical thermal power unit. Secondly, based on the plurality of local linear models, an extended state observer-integrated multiple model predictive controller (MMPC) is designed. Through the introduction of an extended state observer, the disturbance of the power unit in different channels and the model uncertainty are estimated and compensated. Meanwhile, the disturbance rejection performance of the predictive controller is improved. According to the technical scheme of the invention, based on the above algorithm, the large-scale tracking function for the load of the power unit is realized on the premise that the global stability of the control system is ensured. Meanwhile, the good disturbance rejection performance is realized.

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 multi-model predictive control fused with an expansion state observer, which is used for a control algorithm of a furnace coordination system for a supercritical thermal power unit. Background technique [0002] Coordinated control of thermal power units is one of the most important issues in the operation of thermal power units. Its core is to reconcile the slow dynamic process on the boiler side and the fast dynamic process on the turbine side, so that the actual power of the unit can track the load demand of the power grid in real time. At the same time to ensure the safety and efficiency of unit operation. Supercritical thermal power units have been widely used in the past 10 years due to their advantages of high efficiency and low emissions, and have gradually ...

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Problems solved by technology

[0004] The present invention aims at the problem that the unknown disturbance and unit dynamic uncertainty cannot be dealt with in the multi-model predictive control of the coordination system of the existing supercritical thermal power unit, and introduces the extended state observer into the stable MMPC algorithm, and at the same time, the traditional extended state observer Improvements were made, and a multi-model predictive control algorithm for supercritical thermal power unit boiler furnace coordination system was proposed, which can realize the stable tracking of the unit to the grid load command and improve the anti-disturbance performance of the unit during operation.

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