CN109856958A - A kind of control method for preventing integral to be saturated - Google Patents
A kind of control method for preventing integral to be saturated Download PDFInfo
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- CN109856958A CN109856958A CN201711240784.5A CN201711240784A CN109856958A CN 109856958 A CN109856958 A CN 109856958A CN 201711240784 A CN201711240784 A CN 201711240784A CN 109856958 A CN109856958 A CN 109856958A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a kind of control methods for preventing integral to be saturated, detect the instruction value of executing agency and judgement: when the instruction value of executing agency reaches ceiling value, PID regulator tracks the ceiling value, and after the first setting time, PID regulator is switched to former regulative mode；When the instruction value of executing agency reaches lower limit value, PID regulator tracks the lower limit value, and after the second setting time, PID regulator is switched to former regulative mode.The phenomenon that method logic of the invention is simple, effect is obvious, can effectively avoid controller failure appearance, solves integral saturation problem, guarantees each controller regulation quality, improve stability, the economy of whole system, extend unit durability indirectly.
Description
Technical field
The invention belongs to automatic control for thermal power plant technical fields, and in particular to a kind of control method for preventing integral to be saturated.
Background technique
State Grid's industrial development at present is more and more fast, and automatization level is higher and higher, and DCS control has generally applied to each
Thermal power plant, the quality of PID controller regulation quality directly influences stability, economy or even the machine of unit operation in each DCS
The group service life.But PID controller haves the defects that integral saturation in the DCS of part at present.
As shown in Figure 1 be thermal power plant's control system classic control block diagram, the Principles of Regulation are as follows: by the actual value with adjusted
Closed-loop control is carried out by PID regulator after amount setting value work difference, obtained output quantity sends executing agency M/A to, to realize
Adjusting to controlled device.
When executing agency has arrived at extreme position, and regulated variable deviation still has, due to integrating saturation, PID
The resulting operation result of controller continues to increase or reduce, but executing agency, without corresponding movement, this just makes integral be saturated.
Integrate after saturated phenomenon occurs, maximum harm be executing agency's short time can according to the variation of regulated variable into
Row is adjusted, i.e. executing agency's instruction will not change, and is equivalent to controller failure, is gently then influenced the adjusting product of automatic control loop
Matter, it is heavy then influence equipment safety.It is therefore prevented that integral saturation is the necessary guarantee that power plant units operate normally.
Summary of the invention
The purpose of the present invention is to provide a kind of control methods for preventing integral to be saturated, to solve power plant units
Integral saturated phenomenon, which occurs, in PID controller leads to the problem of influencing equipment safety.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of control methods for preventing integral to be saturated, including following method scheme:
Method scheme one, includes the following steps:
Detect the instruction value of executing agency and judgement:
When the instruction value of executing agency reaches ceiling value, PID regulator tracks the ceiling value, the first setting time
Afterwards, PID regulator is switched to former regulative mode；
When the instruction value of executing agency reaches lower limit value, PID regulator tracks the lower limit value, the second setting time
Afterwards, PID regulator is switched to former regulative mode.
Method scheme two, on the basis of method scheme one, after the first setting time, PID regulator is switched to former tune
Section mode simultaneously continues third setting time, detect and judge executing agency instruction value whether in ceiling value hereinafter, if not existing,
PID regulator tracks the ceiling value and simultaneously continues the first setting time, until the instruction value of executing agency drop to ceiling value with
Under.
Method scheme three, on the basis of method scheme one, after the second setting time, PID regulator is switched to former tune
Section mode simultaneously continues the 4th setting time, detects and judges the instruction value of executing agency whether more than lower limit value, if not existing,
PID regulator tracks the lower limit value and simultaneously continues the second setting time, until the instruction value of executing agency rise to lower limit value with
On.
Method scheme four, on the basis of method scheme one, first setting time is 2 seconds.
Method scheme five, on the basis of method scheme one, second setting time is 2 seconds.
Method scheme six, on the basis of method scheme two, the third setting time is 15 seconds.
Method scheme seven, on the basis of method scheme three, the 4th setting time is 15 seconds.
Beneficial effects of the present invention:
The control method for preventing integral to be saturated of the invention increases override control on the basis of former PID closed-loop control
Logic, it may be assumed that when executing agency reaches ceiling value or lower limit value, trigger the override logic, PID regulator is made to track executing agency
Instruction value, after a certain period of time, PID regulator are switched to former regulative mode, then after a certain time, judge the instruction of executing agency
Whether value is restored between ceiling value and lower limit value, if not restoring, continues to repeat the above process.The control method logic letter
Singly, the phenomenon that capable of effectively avoiding integral from being saturated appearance, significant effect, practicability are higher.Moreover, the override control logic only exists
It is possible that occurring just working when integral saturated phenomenon, guarantee that PID regulator being capable of normal regulating.Generally, of the invention
Method can effectively avoid the appearance of the phenomenon that controller failure, guarantee the regulation quality of each controller, adjuster, and then improve whole
Stability, the economy of a system, extend unit durability indirectly.
Detailed description of the invention
Fig. 1 is the classic control block diagram of thermal power plant's control system；
Fig. 2 is the control block diagram for preventing integral to be saturated of the invention.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, to the present invention
It is described in further detail.
It is as shown in Figure 1 the classic control block diagram of thermal power plant's control system, the regulative mode of PID are as follows: regulated variable setting value
Closed-loop control is carried out by PID regulator with after regulated variable actual value work difference, the output quantity of PID sends executing agency M/A to, with
Realize the adjusting to controlled device.
Control method of the invention is to increase auxiliary override logic, the configuration in each Power Plant DCS on the basis of Fig. 1
It realizes.The auxiliary override logic, override signal can only just be acted as when executing agency instructs and reaches ceiling value or lower limit value
With not influencing the normal regulating of thermoelectricity plant controller under rest working conditions, guarantee that executing agency will not abnormal operation.
The control method specifically: detect the instruction value of executing agency and judgement:
When the instruction value of executing agency reaches ceiling value, PID regulator tracks ceiling value, after 2s, PID regulator switching
For former normal regulating mode (the classical closed loop regulative mode of PID i.e. shown in FIG. 1), after normal regulating 15s, if executing agency
Instruction value is still in ceiling value, then Control PID adjuster continues to track the ceiling value of executing agency, so recycles, until executing
The instruction value of mechanism drops to ceiling value or less.
When the instruction value of executing agency reaches lower limit value, PID regulator tracks lower limit value, after 2s, PID regulator switching
For former normal regulating mode (the classical closed loop regulative mode of PID i.e. shown in FIG. 1), after normal regulating 15s, if executing agency
Instruction value is still in lower limit value, then Control PID adjuster continues to track the lower limit value of executing agency, so recycles, until executing
The instruction value of mechanism rises to lower limit value or more.
Generally, the control method logic is simple, effect is obvious, solves PID control when integrating saturation in DCS system
The problem of device failure.
To realize the above method, control block diagram as shown in Figure 2 is devised.On the basis of original PID closed-loop control,
Increase override logic control.Its principle are as follows:
When the instruction value for detecting executing agency reaches ceiling value or lower limit value, the end S of rest-set flip-flop is 1, RS triggering
The output of device is 1, and override signal is 1, triggers override logic, is controlled to adjust according to the method for above-mentioned introduction, to prevent from accumulating
Divide saturated phenomenon.
After override signal is 1 and continues 2s, the high level of trigger pulse is effective, and exporting the end R of rest-set flip-flop is 1,
Rest-set flip-flop set, exporting is 0, and override signal is 0, PID using former regulative mode.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. a kind of control method for preventing integral to be saturated, which comprises the steps of:
Detect the instruction value of executing agency and judgement:
When the instruction value of executing agency reaches ceiling value, PID regulator tracks the ceiling value, after the first setting time, PID
Adjuster is switched to former regulative mode；
When the instruction value of executing agency reaches lower limit value, PID regulator tracks the lower limit value, after the second setting time, PID
Adjuster is switched to former regulative mode.
2. the control method according to claim 1 for preventing integral to be saturated, which is characterized in that after the first setting time,
PID regulator is switched to former regulative mode and continues third setting time, detect and judge executing agency instruction value whether
Hereinafter, if not existing, PID regulator tracks the ceiling value and continues the first setting time ceiling value, until the finger of executing agency
Value is enabled to drop to ceiling value or less.
3. the control method according to claim 1 for preventing integral to be saturated, which is characterized in that after the second setting time,
PID regulator is switched to former regulative mode and continues the 4th setting time, detect and judge executing agency instruction value whether
More than lower limit value, if not existing, PID regulator tracks the lower limit value and continues the second setting time, until the finger of executing agency
Value is enabled to rise to lower limit value or more.
4. the control method according to claim 1 for preventing integral to be saturated, which is characterized in that first setting time is
2 seconds.
5. the control method according to claim 1 for preventing integral to be saturated, which is characterized in that second setting time is
2 seconds.
6. the control method according to claim 2 for preventing integral to be saturated, which is characterized in that the third setting time is
15 seconds.
7. the control method according to claim 3 for preventing integral to be saturated, which is characterized in that the 4th setting time is
15 seconds.
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| CN201711240784.5A CN109856958B (en) | 2017-11-30 | 2017-11-30 | Control method for preventing integral saturation |
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| CN201711240784.5A CN109856958B (en) | 2017-11-30 | 2017-11-30 | Control method for preventing integral saturation |
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| CN109856958B CN109856958B (en) | 2022-03-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703590A (en) * | 2019-10-25 | 2020-01-17 | 杭州和利时自动化有限公司 | Override control method, device, equipment and medium |
| CN113110026A (en) * | 2021-04-09 | 2021-07-13 | 西安热工研究院有限公司 | Anti-integral saturation control method for cascade control system |
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| CN110703590A (en) * | 2019-10-25 | 2020-01-17 | 杭州和利时自动化有限公司 | Override control method, device, equipment and medium |
| CN110703590B (en) * | 2019-10-25 | 2022-06-17 | 杭州和利时自动化有限公司 | Override control method, device, equipment and medium |
| CN113110026A (en) * | 2021-04-09 | 2021-07-13 | 西安热工研究院有限公司 | Anti-integral saturation control method for cascade control system |
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| CN109856958B (en) | 2022-03-18 |
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Address after: 450016 building 13, Zhongyuan Financial Industrial Park, No.56, Mingli Road, Zhengzhou area (Zhengdong), Henan pilot Free Trade Zone, Zhengzhou City, Henan Province Applicant after: Zhongnan electric power test and Research Institute of China Datang Group Science and Technology Research Institute Co.,Ltd. Address before: 450016 9th floor, building 1, No.3 Xiangsheng street, Zhengdong New District, Zhengzhou City, Henan Province Applicant before: DATANG CENTRAL-CHINA ELECTRIC POWER TEST Research Institute |
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Inventor after: Yuan Shitong Inventor after: Bi Yanzhou Inventor after: Yang Yafei Inventor after: Wei Qinghai Inventor after: Zhang Donghai Inventor after: Li Qiuying Inventor before: Bi Yanzhou Inventor before: Yang Yafei Inventor before: Wei Qinghai Inventor before: Zhang Donghai Inventor before: Yuan Shitong Inventor before: Li Qiuying |
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