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

A technology of predictive control and optimal control, which is applied in the control of superheated temperature, steam superheating, lighting and heating equipment, etc. It can solve the problems of affecting the cycle efficiency of the unit, large static deviation, dynamic deviation of reheat steam temperature, etc.

Inactive Publication Date: 2012-04-04
SOUTHEAST UNIV
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  • Claims
  • Application Information

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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 adjust

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

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Embodiment Construction

[0034]Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0035] 1) Obtain the step response model of the reheat steam temperature object.

[0036] Assume that the dynamic characteristics of reheat steam temperature can be given by express. in, G 1 ( s ) is the transfer function of reheat steam temperature to flue gas baffle opening (% / ℃), ; G 2 ( s ) is the transfer function of the reheat steam temperature to the opening of the desuperheating water valve (% / ℃), ;

[0037] Through the field step response tes...

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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...

Claims

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Application Information

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IPC IPC(8): F22G5/00F22G5/12
Inventor 李益国沈炯刘西陲
Owner SOUTHEAST UNIV
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