Reheated gas temperature optimization control method based on multi-variable predictive control

Abstract

The invention discloses a reheated gas temperature optimization control method based on multi-variable predictive control. According to the method, the whole hot steam temperature system is regarded as a two-in one-out multi-variable object, and the flow rate of reheated de-superheating jet water and the opening of a flue gas baffle plate are simultaneously controlled by adopting a multi-variable predictive control method; moreover, optimization of economical efficiency of the system is realized by adding a steady state target value of the opening of a reheated de-superheating jet water adjusting valve into optimization indexes of the conventional predictive control. By adopting the multi-variable predictive control method, coordination of side adjustment of flue gas and side adjustment of steam can be better realized, and the dynamic adjusting quality of the reheated steam temperature is further improved; and meanwhile, by adding the steady state target value of the de-superheating water adjusting valve into the conventional predictive control performance indexes, optimization of the de-superheating water jet quantity is realized, so that the circulating efficiency of a unit can be effectively improved.

Description

technical field [0001] The invention belongs to the field of thermal automatic control, in particular to an optimal control method for a reheating steam temperature system. Background technique [0002] Reheat steam temperature is one of the process parameters that need to be monitored during the operation of thermal power units, and it is directly related to the safety and economy of unit operation. [0003] However, the reheat steam temperature system is also one of the more difficult systems to control. There are three main reasons: first, the reheated steam temperature has an obvious large delay characteristic regardless of the adjustment method on the steam side or the flue gas side; secondly, considering the controllable The performance and control accuracy are poor, and the steam side spray adjustment is generally used as an auxiliary adjustment method at the same time. How to coordinate the work of the two adjustment methods is a problem. Third, adjusting the rehe...

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the above existing problems and deficiencies, the present invention provides a multi-variable system that can solve the problems of reheating steam temperature adjustment dynamic deviation, large static deviation, difficulty in optimizing water spray volume, and affecting unit cycle efficiency. Optimal control method of reheat steam temperature based on predictive control

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