CN103472810B - A kind of amplitude limit method performing loop control system more - Google Patents
A kind of amplitude limit method performing loop control system more Download PDFInfo
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- CN103472810B CN103472810B CN201310450621.5A CN201310450621A CN103472810B CN 103472810 B CN103472810 B CN 103472810B CN 201310450621 A CN201310450621 A CN 201310450621A CN 103472810 B CN103472810 B CN 103472810B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a kind of amplitude limit method performing loop control system more, it is characterized in that: process controller sends steering order, after superposing with the correction instruction that automatic tracking correction loop provides, then export final execution circuit behavior instruction through the restriction of amplitude limiter, when the instruction of this execution loop reaches limits value, automatically judged result is provided by decision logic, correction instruction is enabled by switch logic, correction instruction is calculated by counter circuit and automatic tracking correction loop and provides, its value equals the difference of limits value and current controller steering order, and then go with correction instruction the input value revising amplitude limiter, it is made to be subject to equal limits value all the time in limited time, execution loop is made to adopt correction instruction counter circuit in steering order to responding the method during confined opposite direction action in time, automatic tracking correction loop, whether reach decision logic module and the switch logic module of restriction.
Description
Technical field
The present invention relates to a kind of limiting technology field performing loop control system execution loop more.
Background technology
In the production processes such as electric power, oil, chemical industry control, there is a lot of control system performing loop more, what perform loop acceptance because each is same steering order, the characteristic in each execution loop is not quite similar again, therefore, when needs carry out amplitude restriction to single execution loop, often more difficult, lack rational limiting means, the phenomenon that directly can affect the control characteristic of control system because of amplitude limit improper measures often occurs.
Many execution loop control system, in the technical process control of reality, for the needs of control object safety and stability, requires to limit the movement range in each execution loop.Due to the acceptance of each execution loop is same steering order, and respective device characteristics and operational characteristic there are differences, therefore be not identical to the requirement of the movement range in each execution loop etc., its upper and lower limits value is also different, so, amplitude limit measure just can not be implemented in instruction, can only implement separately, as shown in Figure 1 in the instruction in each execution loop.
Subject matter existing for amplitude limit method shown in Fig. 1 is: automatically under controlled load case, when certain execution loop instruction reaches limits value, just no longer change after the limited maintenance limits value of this loop output order, when now owing to controlling to need the execution loop not reaching limits value to other to proceed equidirectional adjustment, the steering order that controller exports will inevitably continue to change to confined direction, the instruction before performing loop limiter that is limited is caused to depart from limited value far away, when control system is adjusted back in the other direction, just readjustment action can be there is in the execution loop be limited after just needing to overcome the dead band that this deviation value causes, be similar to the process overcoming saturation integral, cause control lag, have a strong impact on the adjusting function of control system.
Summary of the invention
The technical problem to be solved in the present invention: a kind of reasonably amplitude limit method performing loop control system execution loop is provided more, the object of amplitude limit can be reached according to the actual requirements, can overcome again and perform phenomenon seriously delayed when loop is adjusted back from limits value, promote the speed performing loop response, improve the rapidity of whole control system, meet the demand to technical process control better.
Technical solution of the present invention is as follows: process controller sends steering order, after superposing with the correction instruction that automatic tracking correction loop provides, then exports final execution circuit behavior instruction through the restriction of amplitude limiter; When the instruction of this execution loop reaches limits value, automatically judged result is provided by decision logic, correction instruction is enabled by switch logic, correction instruction is calculated by counter circuit and automatic tracking correction loop and provides, its value equals the difference of limits value and current controller steering order, and then by the input value of correction instruction correction amplitude limiter, make it by equaling limits value all the time in limited time, execution loop is responded to during confined opposite direction action in time in steering order.
The method adopts correction instruction counter circuit, automatically tracking correction loop, the decision logic module whether reaching restriction and switch logic module.
Beneficial effect of the present invention: the present invention is by rational amplitude limit method, solve the problem performing the amplitude limit difficulty in loop control system execution loop well more, eliminate and perform drawback seriously delayed when loop is adjusted back from limits value, promote the speed performing loop response, improve the rapidity of whole control system, meet the needs to technical process control better.Obtain application during the fuel of the present invention on 4 overcritical thermal power generation unit of 600MW of Xingyi of Guizhou generating plant, Tang Zhai generating plant controls, have received good effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art.
Fig. 2 schematic diagram of the present invention is innovative part of the present invention in dotted line frame in figure.
Embodiment
Embodiments of the invention: a kind of amplitude limit method performing loop control system, it comprises correction instruction counter circuit, automatically tracking correction loop, the decision logic whether reaching restriction, switch logic more.Counter circuit performs difference between the instruction of loop before calculating limits value and amplitude limiter, as correction instruction after the process of automatic tracking correction loop, after decision logic judges that the instruction of this execution loop reaches limits value, provide judged result, correction instruction drops into according to judged result by switch logic, go the steering order provided with process controller to superpose, the restriction then through amplitude limiter exports final execution circuit behavior instruction.
When the instruction of this execution loop reaches limits value, the execution loop instruction that loop exports is restricted, keep constant by limit value, topworks can not again to the action of confined direction, now, the correction instruction given by automatic tracking correction loop is put into, and no longer remains unchanged, but allow deviation between its limits value from this loop of motion tracking and controller output order, that is:
Limits value-controller the output order (upper limit or lower limit) in correction instruction=this loop ... formula 1.
Perform the instruction=controller output order+correction instruction before the amplitude restriction of loop ... formula 2.
Formula that 2. formula is substituted into 1. can obtain perform loop restricted time:
The limits value in the instruction before amplitude limiter=this loop
Now occur to being limited the contrary readjustment in direction once controller output order, confined execution loop just can make an immediate response on the basis of limits value, make topworks that action in the other direction occur, effectively overcome restriction dead band, eliminate the drawback of response lag, improve the rapidity of control system.
Claims (2)
1. perform an amplitude limit method for loop control system more, send steering order by process controller, after superposing with the correction instruction that automatic tracking correction loop provides, then export final execution circuit behavior instruction through the restriction of amplitude limiter; It is characterized in that: when the instruction of this execution loop reaches limits value, automatically judged result is provided by decision logic, correction instruction is enabled by switch logic, correction instruction is calculated by counter circuit and automatic tracking correction loop and provides, its value equals the difference of limits value and current controller steering order, and then go with correction instruction the input value revising amplitude limiter, make it by equaling limits value all the time in limited time, execution loop is responded to during confined opposite direction action in time in steering order.
2. a kind of amplitude limit method performing loop control system according to claim 1, is characterized in that: the method adopts correction instruction counter circuit, automatically tracking correction loop, the decision logic module whether reaching restriction and switch logic module more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310450621.5A CN103472810B (en) | 2013-09-29 | 2013-09-29 | A kind of amplitude limit method performing loop control system more |
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| CN201310450621.5A CN103472810B (en) | 2013-09-29 | 2013-09-29 | A kind of amplitude limit method performing loop control system more |
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| CN103472810A CN103472810A (en) | 2013-12-25 |
| CN103472810B true CN103472810B (en) | 2016-02-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339204A (en) * | 1999-01-29 | 2002-03-06 | 艾利森电话股份有限公司 | Method and an apparatus for clipping signals in a CDMA system |
| CN1838545A (en) * | 2005-03-25 | 2006-09-27 | 日本电气株式会社 | Power clipping circuit and power clipping method |
| JP2009070034A (en) * | 2007-09-12 | 2009-04-02 | Nakanishi Metal Works Co Ltd | Conveyor system for inter-process conveyance |
| CN102148920A (en) * | 2010-02-09 | 2011-08-10 | 联发科技股份有限公司 | Synchronizing signal amplitude limiting device and method |
| CN102547307A (en) * | 2011-12-27 | 2012-07-04 | 北京中科大洋科技发展股份有限公司 | Digital video amplitude limiting method for analog broadcasting TV signal |
| CN102957659A (en) * | 2012-11-14 | 2013-03-06 | 西南石油大学 | Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system |
-
2013
- 2013-09-29 CN CN201310450621.5A patent/CN103472810B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339204A (en) * | 1999-01-29 | 2002-03-06 | 艾利森电话股份有限公司 | Method and an apparatus for clipping signals in a CDMA system |
| CN1838545A (en) * | 2005-03-25 | 2006-09-27 | 日本电气株式会社 | Power clipping circuit and power clipping method |
| JP2009070034A (en) * | 2007-09-12 | 2009-04-02 | Nakanishi Metal Works Co Ltd | Conveyor system for inter-process conveyance |
| CN102148920A (en) * | 2010-02-09 | 2011-08-10 | 联发科技股份有限公司 | Synchronizing signal amplitude limiting device and method |
| CN102547307A (en) * | 2011-12-27 | 2012-07-04 | 北京中科大洋科技发展股份有限公司 | Digital video amplitude limiting method for analog broadcasting TV signal |
| CN102957659A (en) * | 2012-11-14 | 2013-03-06 | 西南石油大学 | Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system |
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| CN103472810A (en) | 2013-12-25 |
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