Predictive control method for supercritical set based on decoupling and disturbance observation

Abstract

The invention discloses a predictive control method for a supercritical set based on decoupling and disturbance observation. According to the method, a supercritical thermal power generating set is adopted as a controlled object, the fuel amount, the water supply amount, and the openness of an adjusting valve of a steam turbine are adopted as inputs, the main steam pressure, the middle point temperature, and the loads of the set are adopted as outputs, the controlled object is enabled to be similar to decoupling through a feedforward compensator, and then disturbance is observed through disturbance observers which are respectively arranged at channels, so that the multivariate predictive control to the controlled object is realized, the problem of poor control effects caused by the disturbance influences of a coordinative control system of the supercritical set is solved, the external influence that the disturbance cannot be measured can be effectively inhibited, and besides, the internal disturbance caused by the coupling between input varies can be inhibited, so that the control property of the coordinative control system of the supercritical set is improved.

Description

technical field [0001] The invention belongs to the field of thermal automatic control of supercritical thermal power units, in particular to a supercritical unit predictive control method based on decoupling and disturbance observation. Background technique [0002] During the operation of supercritical thermal power units, the coordinated control system is affected by internal disturbances caused by model mismatch and variable coupling, as well as various external disturbances. The existence of these disturbances significantly reduces the control effect of the controller. [0003] When many advanced control algorithms deal with strong disturbances, because there is no targeted disturbance rejection design in the controller, the dynamic characteristics of the system are still insufficient, which affects the control performance. In addition to the measurable disturbances, there are also a large number of disturbances that cannot be measured online in the coordinated control ...

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem of poor control effect caused by interference in the coordinated control system of supercritical units in the prior art, the present invention provides a predictive control method for supercritical units based on decoupling and disturbance observation, which can effectively suppress The impact of various unmeasurable disturbances in the field further improves the control performance of the coordinated control system. This method only designs a disturbance observer for the main diagonal channel, which reduces the complexity of the control system structure and effectively suppresses the strong coupling of internal factors in the system. internal disturbance

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