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Modified Smith prediction main stream temperature control structure

A technology for controlling structure and main steam temperature, applied in the direction of temperature control, adaptive control, general control system, etc., can solve not many problems, achieve the effect of reducing dynamic deviation and facilitating engineering application

Active Publication Date: 2015-04-08
SHANGHAI POWER EQUIP RES INST
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Problems solved by technology

Although advanced control algorithms and control concepts have been proposed to compensate for the large lag of steam temperature, not many have been applied in practice.

Method used

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  • Modified Smith prediction main stream temperature control structure
  • Modified Smith prediction main stream temperature control structure
  • Modified Smith prediction main stream temperature control structure

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Embodiment Construction

[0010] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0011] In the main steam temperature control system, the output of the temperature controller constitutes the setting value of the desuperheating water spray flow controller. Between the inlet temperature and the outlet temperature of the three-stage superheater, the steam in the pipe and the pipe wall are multiple single-capacity objects connected in series to form a multi-capacity object, so the controlled object has a large hysteresis characteristic.

[0012] The main principle of the Smith estimator is to pre-estimate the dynamic characteristics of the controlled process under a certain disturbance, and then compensate it in advance by the Smith estimator, so that the adjusted quantity with a delay time of 0 is reflected to the controller in advance, so that The controller acts in advance, thereby reducing the overshoot of the...

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Abstract

The invention provides a modified Smith prediction main stream temperature control structure. The modified Smith main stream temperature control prediction structure is characterized by a system transfer function. The another technical scheme includes that a novel Smith predictor is added, and a modified Smith main stream temperature prediction structure is provided and characterized by a system transfer function. The modified Smith prediction main stream temperature control structure has the advantages that the function transferring manner that the one-order inertia adds the delay link of the conventional Smith predictor is replaced by the high-order system, allowing the prediction system stable, thus dynamic deviation of the system is decreased and engineering application is convenient.

Description

technical field [0001] The invention relates to a main steam temperature control structure of supercritical and ultra-supercritical units in thermal power plants. Background technique [0002] With the development of our country's electric power industry, the number of large-capacity units in our country continues to increase, and the degree of automation of the power grid has also been greatly improved, which puts forward higher requirements for the quality of unit control. Among them, the main steam temperature is an important parameter related to the economical and safe operation of the unit. When the unit is running, the main steam temperature is required to change around the set value without excessive deviation. Conventional main steam temperature control schemes are generally cascade PID control schemes, because PID control has the characteristics of high stability, simple structure, convenient adjustment, and strong versatility, so its position in power plant contro...

Claims

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Application Information

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IPC IPC(8): G05D23/00G05B13/04
Inventor 郦晓雪高升钱立民王琳李钟钦朱潘鑫
Owner SHANGHAI POWER EQUIP RES INST
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