CN111928232A - Integral saturation resisting method for PID controller in steam temperature control system - Google Patents
Integral saturation resisting method for PID controller in steam temperature control system Download PDFInfo
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- CN111928232A CN111928232A CN202010585969.5A CN202010585969A CN111928232A CN 111928232 A CN111928232 A CN 111928232A CN 202010585969 A CN202010585969 A CN 202010585969A CN 111928232 A CN111928232 A CN 111928232A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/20—Controlling superheat temperature by combined controlling procedures
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Temperature (AREA)
- Feedback Control In General (AREA)
Abstract
The invention relates to an integral saturation resisting method for a PID (proportion integration differentiation) controller in a steam temperature control system, which comprises the following steps of: upper limit anti-integral saturation: when the temperature-reducing water regulating valve instruction is larger than 99.5 and the regulated quantity of the main PID rises for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve regulating instruction maintains the current value until the regulated quantity of the main PID does not have a rising trend; lower limit anti-integral saturation: when the temperature-reducing water regulating valve instruction is less than 0.5 and the regulated quantity of the main PID is reduced for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve instruction maintains the current value until the regulated quantity of the main PID does not have a descending trend. The invention can solve the problem of integral saturation of the conventional PID, effectively reduce the overshoot of the steam temperature control system and improve the stability.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to an integral saturation resisting method for a PID (proportion integration differentiation) controller in a steam temperature control system.
Background
The steam temperature is an important parameter in a thermal power plant thermodynamic system, and the quality of steam temperature control directly influences the safe and economic operation of the whole unit. Because the steam temperature object has the characteristics of large delay, large inertia, time-varying property, nonlinearity and the like, the steam temperature of each stage of the existing water spray temperature reduction system mostly adopts a cascade PID control scheme.
In the conventional cascade PID control, when the steam temperature (regulated amount) is uniformly increased (or reduced) until the temperature-reducing water regulating valve is fully opened (or fully closed), the PID controller can continue to calculate, and the problem of integral saturation is easy to occur.
Disclosure of Invention
The invention aims to provide an integral saturation resisting method for a PID controller in a steam temperature control system, so as to solve the problem of integral saturation of conventional PID, effectively reduce the overshoot of the steam temperature control system and improve the stability.
The invention provides an integral saturation resisting method for a PID (proportion integration differentiation) controller in a steam temperature control system, which is characterized by comprising the following steps of:
upper limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is larger than 99.5 and the regulated quantity of the main PID rises for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve regulating instruction maintains the current value until the regulated quantity of the main PID does not have a rising trend;
lower limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is less than 0.5 and the regulated quantity of the main PID is reduced for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve instruction maintains the current value until the regulated quantity of the main PID does not have a descending trend.
Further, the method for determining the upper limit anti-integral saturation and the increase of the adjusted quantity of the main PID is that the differential difference value is larger than 0.1.
Further, the method for determining that the upper limit anti-integral saturation and the main PID regulated quantity do not have an ascending trend is that the differential difference value is not more than 0.1.
Further, the method for determining the decrease of the lower-limit anti-integral saturation and the adjusted quantity of the main PID is that the differential difference value is smaller than-0.1.
Further, the method for determining that the lower limit anti-integral saturation and the adjusted quantity of the main PID have no downward trend is that the differential difference is not less than-0.1.
By means of the scheme, the integral saturation problem of the conventional PID can be solved through the integral saturation resisting method of the PID controller in the steam temperature control system, meanwhile, the overshoot of the steam temperature control system is effectively reduced, and the stability is improved.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
FIG. 1 is a flow chart of an embodiment of a PID controller anti-integral saturation method in a steam temperature control system according to the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides an anti-integral saturation method for a PID controller in a steam temperature control system, which is characterized by comprising the following steps:
upper limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is larger than 99.5 and the regulated quantity of the main PID rises for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve regulating instruction maintains the current value until the regulated quantity of the main PID does not have a rising trend;
lower limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is less than 0.5 and the regulated quantity of the main PID is reduced for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve instruction maintains the current value until the regulated quantity of the main PID does not have a descending trend.
By the integral saturation resisting method for the PID controller in the steam temperature control system, the problem of integral saturation of the conventional PID can be solved, the overshoot of the steam temperature control system is effectively reduced, and the stability is improved.
In this embodiment, the method for determining the upper limit anti-integral saturation and the increase of the adjusted quantity of the main PID is that the differential difference is greater than 0.1.
In this embodiment, the determination method that the upper limit anti-integral saturation and the adjusted amount of the main PID do not have an ascending trend is that the differential difference is not greater than 0.1 (less than or equal to 0.1).
In this embodiment, the method for determining the decrease of the lower-limit anti-integral saturation and the adjusted quantity of the main PID is that the differential difference is smaller than-0.1.
In this embodiment, the method for determining that the lower-limit anti-integral saturation and the adjusted quantity of the main PID do not have a downward trend is that the differential difference is not less than-0.1 (greater than or equal to-0.1).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. An integral saturation resisting method for a PID controller in a steam temperature control system is characterized by comprising the following steps:
upper limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is larger than 99.5 and the regulated quantity of the main PID rises for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve regulating instruction maintains the current value until the regulated quantity of the main PID does not have a rising trend;
lower limit anti-integral saturation:
when the temperature-reducing water regulating valve instruction is less than 0.5 and the regulated quantity of the main PID is reduced for 5S, the main PID and the auxiliary PID enter a tracking state to stop operation, and the valve instruction maintains the current value until the regulated quantity of the main PID does not have a descending trend.
2. The PID controller anti-integral saturation method in the steam temperature control system according to claim 1, wherein the determination method of the upper limit anti-integral saturation and the main PID regulated quantity rise is that the differential difference value is larger than 0.1.
3. The PID controller anti-integral saturation method in the steam temperature control system according to claim 2, wherein the determination method that the upper limit anti-integral saturation and the main PID regulated quantity do not have the ascending trend is that the differential difference value is not more than 0.1.
4. The PID controller anti-integral saturation method in the steam temperature control system according to claim 3, wherein the determination method of the lower limit anti-integral saturation and the main PID regulated quantity reduction is that the differential difference value is less than-0.1.
5. The PID controller anti-integral saturation method in the steam temperature control system according to claim 4, wherein the determination method that the lower limit anti-integral saturation and the main PID regulated quantity do not have a downward trend is that the differential difference is not less than-0.1.
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| CN202010585969.5A CN111928232A (en) | 2020-06-24 | 2020-06-24 | Integral saturation resisting method for PID controller in steam temperature control system |
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| CN202010585969.5A CN111928232A (en) | 2020-06-24 | 2020-06-24 | Integral saturation resisting method for PID controller in steam temperature control system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108750A2 (en) * | 2004-05-06 | 2005-11-17 | United Technologies Corporation | Startup and control methods for an orc bottoming plant |
| JP2007187340A (en) * | 2006-01-11 | 2007-07-26 | Nippon Steel Engineering Co Ltd | Boiler main steam temperature control method for waste treatment facility |
| CN102426431A (en) * | 2011-11-28 | 2012-04-25 | 广东电网公司电力科学研究院 | Anti-integral saturation control method and system of cascade control system |
| CN102607006A (en) * | 2012-03-08 | 2012-07-25 | 东南大学 | Boiler temperature control method for preventing integral saturation and intelligent integral |
| CN106997171A (en) * | 2017-04-27 | 2017-08-01 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Stream temperature degree adjusting method and regulating system |
-
2020
- 2020-06-24 CN CN202010585969.5A patent/CN111928232A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108750A2 (en) * | 2004-05-06 | 2005-11-17 | United Technologies Corporation | Startup and control methods for an orc bottoming plant |
| JP2007187340A (en) * | 2006-01-11 | 2007-07-26 | Nippon Steel Engineering Co Ltd | Boiler main steam temperature control method for waste treatment facility |
| CN102426431A (en) * | 2011-11-28 | 2012-04-25 | 广东电网公司电力科学研究院 | Anti-integral saturation control method and system of cascade control system |
| CN102607006A (en) * | 2012-03-08 | 2012-07-25 | 东南大学 | Boiler temperature control method for preventing integral saturation and intelligent integral |
| CN106997171A (en) * | 2017-04-27 | 2017-08-01 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Stream temperature degree adjusting method and regulating system |
Non-Patent Citations (3)
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| 余雷: "基于单神经元自适应PSD控制器的火电厂锅炉过热汽温控制", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
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Application publication date: 20201113 |