Secondary reheat steam temperature control device and system based on model predictive control

Abstract

The invention discloses a secondary reheat steam temperature control device based on model predictive control. The secondary reheat steam temperature control device comprises a model predictive control module, a first comparator, a PID control module, a second comparator, a secondary loop transfer function module G1(s), a third comparator, a main loop transfer function module G2(s) which are connected in series. The output end of the secondary loop transfer function module G1(s) is connected to one input end of the first comparator. A first disturbance module is connected to one input end of the second comparator. A second disturbance module is connected to one input end of the third comparator. The output end of the main loop transfer function module G2(s) is connected to one input end ofthe model predictive control module. The other input end of the model predictive control module is used as the temperature input end to a reheater. The invention also discloses a secondary reheat steam temperature control system. The secondary reheat steam temperature control device solves the nonlinearity, the time variation, and the hysteresis of a conventional device in the secondary reheat steam temperature PID control process.

Description

technical field [0001] The invention relates to power equipment, and more particularly to a temperature control system for secondary reheated steam. Background technique [0002] With the increasing development of the economy and the improvement of people's living standards, the consumption of energy resources and carbon dioxide emissions caused by the power consumption of factories and households has increased sharply. In order to alleviate this situation, the state has put forward higher requirements for environmental protection while advocating energy conservation and emission reduction. In this context, the secondary reheating technology with higher overall efficiency has been applied to the power generation of thermal power units in my country. Reheating means that the steam that has done part of the work in the steam turbine is led out for reheating, and then led back to the steam turbine to continue to work. Through reasonable reheating, the exhaust humidity can be ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention lies in the problems of non-linearity, time-varying and hysteresis in the PID control process of the secondary reheating steam temperature of the existing device

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