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An improved smith estimated main steam temperature control structure

A technology for controlling structure and main steam temperature, applied in 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: 2018-02-13
SHANGHAI POWER EQUIP RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • An improved smith estimated main steam temperature control structure
  • An improved smith estimated main steam temperature control structure
  • An improved smith estimated main steam temperature control structure

Examples

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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 present invention provides an improved Smith predictor main steam temperature control structure, characterized in that the system transfer function is another technical solution of the present invention by adding a new type of Smith predictor, providing an improved Smith predictor The main steam temperature control structure is characterized in that the system transfer function provides a new type of Smith predictor structure for the present invention, and the transfer function required by the traditional Smith predictor is first-order inertia plus delay link The form is converted into a high-order The system makes the prediction system more stable, which is beneficial to reduce the dynamic deviation of the system and facilitate engineering applications.

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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Patent Type & Authority Patents(China)
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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