Control method and device of thermal power generating unit control system

Abstract

The invention discloses a control method and device for a thermal power generating unit control system, and the method comprises the steps: carrying out the parameter optimization calculation according to the historical data of the input quantity (including one path of control quantity and at least one path of measurable disturbance quantity) and the output quantity of a controlled object, so as to build a prediction model of the controlled object, the output quantity change of a controlled object in a future time window is predicted through a prediction model to obtain a predicted output quantity matrix, the change of the output deviation value in the future time window is estimated through NLTD to obtain a correction quantity matrix, and the predicted output quantity matrix is corrected according to the correction quantity matrix to obtain a corrected predicted output quantity matrix. And determining an objective function of an optimal control law, solving an increment of a current control quantity in a future time window based on the objective function according to a set value reference trajectory of the output quantity in the future time window and the corrected predicted output quantity matrix, and superposing the increment to the current control quantity. The anti-interference capability of the control system can be improved.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to a control method and device for a thermal power unit control system. Background technique [0002] The proportion of new energy power in the power structure layout is gradually increasing, and the proportion of traditional power generation with fossil energy as primary energy is gradually decreasing. But for a long time in the future (about 50 years), the dominance of traditional fossil energy will not change. However, with the continuous increase in the ratio of grid-connected new energy power, its random fluctuation reduces the controllability of the power supply side, which breaks the original supply-demand balance controllability of the power system, leading to the current curtailment of wind and light in my country. Phenomenon. [0003] Multi-energy complementarity can use a relatively controllable power source to stabilize the fluctuating power source, and then ...

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Problems solved by technology

[0004] With the promulgation of relevant rules and regulations of the power grid, the important role of large-scale coal-fired generating units participating in deep peak shaving of the power grid has been further clarified, which means that thermal power units will often operate in a state of deep variable load. Therefore, on the basis of the safe and stable operation of the unit, it is of great significance to study the coordinated control optimization scheme that can effectively improve the flexibility of the unit

[0005] At the same time, the country has higher and higher requirements on the environmental protection emission indicators of thermal power generation units. Many thermal power generation units have completed the transformation of low-nitrogen burners. Fundamental changes have occurred, thereby increasing the fluctuation range of superheated steam temperature, resulting in frequent overheating phenomena, increased personnel intervention, and increased pressure on monitoring disks

Conventional steam temperature control adopts PID control-based cascade, leading differential and other control strategies, and the control effect is not ideal

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