Improved method of limitation generalized predictive control for thermal power unit reheat steam temperature

Abstract

The invention relates to an improved method of limitation generalized predictive control for thermal power unit reheat steam temperature. In the invention, an interior model for improving limitation predictive control is obtained through a reheat steam temperature set value step experience; a reheat steam temperature control system records a spray desuperheating valve opening instruction sequence and a reheat steam temperature measured value sequence in real time; and an opening increment instruction of a current spray desuperheating valve is obtained through simple calculation. The control method solves the problems that the traditional limitation generalized predictive control has complicated optimization problem and large calculated amount and the regulation of the reheat steam temperature control system is lagged and has slow response, thereby causing rapid and stable temperature control of a reheater without dynamic deviation.

Description

technical field [0001] The invention is a method for adjusting the reheat steam temperature control system of a thermal power unit through an improved limited predictive control strategy, so that the reheat steam temperature can track the set value quickly, stably, and without deviation, and belongs to thermal engineering field of automatic control. Background technique [0002] The reheat steam temperature system of a thermal power unit is one of the most important control systems in a thermal power plant, and it is also one of the difficulties in thermal power plant control. The controlled variable is the reheat steam temperature. If the temperature is too high, the reheater will explode. If the temperature is too low, the economic efficiency of the unit will be reduced. What is more, it will cause cavitation of the steam turbine with water, which will endanger the safe operation of the unit. Therefore, keep reheating It is very important to stabilize the steam temperatur...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The purpose of this invention is to propose a generalized predictive control method for thermal power unit reheating steam temperature improvement limited, which is used in the reheating steam temperature control system, and solves the problem that the traditional limited prediction is difficult for engineering application and the thermal engineering object of reheating steam temperature Problems with large lags, nonlinearity, and time-varying nature

[0006] Technical solution: In order to overcome the above problems, by adopting the improved limited predictive generalized predictive control, the traditional limited predictive control algorithm is complex, the calculation amount is large and the shortcomings of difficult engineering application are solved, and it is used in the reheat steam temperature control system to make the system response speed Fast, good dynamic tracking performance, no system oscillation, no dynamic deviation

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