CN112379648B - Control method for judging whether unit is increased or decreased in cold station control system - Google Patents
Control method for judging whether unit is increased or decreased in cold station control system Download PDFInfo
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- CN112379648B CN112379648B CN202011283407.1A CN202011283407A CN112379648B CN 112379648 B CN112379648 B CN 112379648B CN 202011283407 A CN202011283407 A CN 202011283407A CN 112379648 B CN112379648 B CN 112379648B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- 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]
Abstract
The invention discloses a control method for judging whether to increase or decrease a unit in a cold station control system, which comprises the following steps: step one, monitoring data; step two, substituting numbersAccordingly; step three, judging data; step four, judging the increase of the engine; step five, returning data; step six, monitoring and judging; step seven, operation judgment is carried out; step eight, judging again; step nine, judging and returning; step ten, judging the reduction machine; in the first step, the water temperature T and the set water temperature T are respectively monitored in real time according to the number n of the running devicessTemperature T of equipmentIBuffer temperature difference TDAnd buffer temperature difference TB(ii) a In the second step, the data monitored is brought into a primary judgment formula to be judged by the primary judgment formula, and the logic is controlled according to the water temperature change trend, so that the problem that equipment is unnecessarily started and stopped due to water temperature fluctuation is solved, the actual refrigeration load demand can be responded in time, and unnecessary mechanical loss and energy consumption are reduced.
Description
Technical Field
The invention relates to the technical field of cold station control systems, in particular to a control method for judging whether a unit is increased or decreased in a cold station control system.
Background
Generally, when a plurality of refrigeration devices are arranged in a cold station, a cold station centralized control system can automatically control the start and stop of the refrigeration devices according to the temperature difference between water temperature and set temperature and the start and stop temperature difference. If the water temperature is right near the start-stop boundary, the fluctuation of the water temperature can cause unnecessary start-stop of the equipment, and cause unnecessary mechanical loss and energy consumption of the associated equipment, so that a control method for judging whether to increase or decrease the unit in the cold station control system is necessary.
Disclosure of Invention
The present invention is directed to a control method for determining whether to increase or decrease a unit in a cold station control system, so as to solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: a control method for judging whether to increase or decrease a unit in a cold station control system comprises the following steps: step one, monitoring data; substituting data; step three, judging data; step four, judging the additional engine; step five, returning data; step six, monitoring and judging; step seven, operation judgment is carried out; step eight, judging again; step nine, judging and returning; step ten, judging the reduction machine;
in the first step, the water temperature T and the set water temperature T are respectively monitored in real time according to the number n of the running devicessTemperature T of equipmentIBuffer temperature difference TDAnd buffer temperature difference TB；
In the second step, the data to be monitored is substituted into a primary judgment formula to be judged by the primary judgment formula;
wherein in the third step, when the water temperature monitored in the first step is set to the temperature TsTemperature T of equipmentIBuffer temperature difference TBWhen the water temperature T meets the primary judgment formula in the second step, the judgment of the delay time of the engine increase is carried out, and if the water temperature T does not meet the primary judgment formula, the judgment can be carried out by entering a secondary judgment formula;
in the fourth step, if the set engine increasing delay time is up, the (n + 1) th equipment can be started, and if the set engine increasing delay time is not up, the first step can be returned to for judging again;
in the fifth step, if the monitored data passes through the secondary judgment formula, entering the tertiary judgment formula for secondary judgment, and if the monitored data does not meet the secondary judgment formula, entering the quaternary judgment formula for judgment;
in the sixth step, if the monitored data meet the third judgment formula, the step four can be entered, and if the monitored data do not meet the third judgment formula, the step five can be returned to for judgment again;
in the seventh step, when the monitored data passes through the fourth judgment formula, the judgment can be carried out by entering the fifth judgment formula, and if the monitored data does not pass through the fourth judgment formula, the judgment can be carried out again by returning to the second step;
in the eighth step, when the monitored data meets the fifth judgment formula, entering the sixth judgment formula for judgment, and if the monitored data does not meet the fifth judgment formula, returning to the seventh step for judgment again;
in the ninth step, when the monitored data passes through the judgment formula for six times, judgment can be carried out by reducing the delay time, and when the monitored data does not pass through the judgment formula for six times, judgment can be carried out again by returning to the eighth step;
in the above step ten, the nth device may be turned off when the set engine reduction delay time is reached, and the process may return to the step nine to perform the second determination when the set engine reduction delay time is not reached.
According to the above technical scheme, in the second step, the primary judgment formula is that T is more than TS+TI+TB。
According to the technical scheme, in the third step, the secondary judgment formula is that T is more than TS+TI。
According to the technical scheme, in the fifth step, the third judgment formula is RI> 1, and RIIs derived from the increasing trend factor algorithm, namely at TS+TI＜T＜TS+TI+TBIn the temperature interval, calculating the water temperature change PID value by using an increment PID formula algorithm, wherein the PID increment value is u (t) when the nth calculation period is startedn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; the PID increment value is u (t) when entering the n +1 part of calculation periodn+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]And f, the increasing trend factor is RI＝u(t)n+1-u(t)n。
According to the technical scheme, in the fifth step, the fourth judgment formula is that T is less than TS-TD。
According to the technical scheme, in the seventh step, the formula of five times of judgment is that T is less than TS-TD-TB。
According to the above technical scheme, in the eighth step, six judgments are performedThe formula is RD＞1，RDIs at TS-TD-TB＜T＜TS-TDIn the temperature interval, the PID increment value is u (t) when the nth calculation period is enteredn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; entering the n +1 th calculation period, wherein the PID increment value is u (t)n+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]Get the trend factor of machine reduction to RD＝u(t)n-u(t)n+1。
Compared with the prior art, the invention has the following beneficial effects: according to the control method for judging whether the unit is increased or decreased in the cold station control system, the problem of unnecessary starting and stopping of equipment caused by water temperature fluctuation is solved by monitoring the water temperature and increasing the water temperature change trend control logic, the actual refrigeration load demand can be responded in time, the cold station system is enabled to run more stably, and unnecessary mechanical loss and energy consumption are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a control flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a control method for judging whether to increase or decrease a unit in a cold station control system comprises the following steps: step one, monitoring data; substituting data; step three, judging data; step four, judging the additional engine; step five, returning data; step six, monitoring and judging; step seven, operation judgment is carried out; step eight, judging again; step nine, judging and returning; step ten, judging the reduction machine;
in the first step, the water temperature T and the set water temperature T are respectively monitored in real time according to the number n of the running devicessEquipment temperature TIBuffer temperature difference TDAnd buffer temperature difference TB；
In the second step, the data to be monitored is substituted into a primary judgment formula to be judged by using the primary judgment formula, wherein the primary judgment formula is T > TS+TI+TB；
Wherein in the third step, when the water temperature monitored in the first step is set to be TsTemperature T of equipmentIBuffer temperature difference TBAnd when the water temperature T meets the primary judgment formula in the second step, the machine-increasing delay time judgment is carried out, if the water temperature T does not meet the primary judgment formula, the secondary judgment formula is carried out, and the secondary judgment formula is that T is more than TS+TI；
In the fourth step, if the set engine increasing delay time is up, the (n + 1) th equipment can be started, and if the set engine increasing delay time is not up, the first step can be returned to for judging again;
in the fifth step, if the monitored data passes through the secondary judgment formula, the third judgment formula can be entered for carrying out the second judgment, if the monitored data does not meet the secondary judgment formula, the fourth judgment formula can be entered for carrying out the judgment, and the third judgment formula is RI> 1, and RIIs derived from the increasing trend factor algorithm, namely at TS+TI＜T＜TS+TI+TBIn the temperature interval, calculating the water temperature change PID value by using an increment PID formula algorithm, wherein the PID increment value is u (t) when the nth calculation period is startedn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; the PID increment value is u (t) when entering the n +1 part of calculation periodn+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}, thenThe increasing trend factor is RI＝u(t)n+1-u(t)nThe formula of the fourth judgment is T < TS-TD；
In the sixth step, if the monitored data meets the third judging formula, the step four can be entered, and if the monitored data does not meet the third judging formula, the step five can be returned to for judging again;
in the seventh step, when the monitored data passes through the fourth judgment formula, the judgment can be carried out by entering the fifth judgment formula, and if the monitored data does not pass through the fourth judgment formula, the judgment can be carried out again by returning to the second step, wherein the fifth judgment formula is that T is less than TS-TD-TB；
In the above step eight, when the monitored data satisfies the fifth judging formula, the method can enter the sixth judging formula to judge, and if the monitored data does not satisfy the fifth judging formula, the method can return to the step seven to judge the sixth judging formula to be R againD＞1，RDIs at TS-TD-TB＜T＜TS-TDIn the temperature interval, the PID increment value is u (t) when the nth calculation period is enteredn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; the PID increment value is u (t) when entering the n +1 part of calculation periodn+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]Get the trend factor of machine reduction to RD＝u(t)n-u(t)n+1；
In the ninth step, when the monitored data passes through the judgment formula for six times, judgment can be carried out by reducing the delay time, and when the monitored data does not pass through the judgment formula for six times, judgment can be carried out again by returning to the eighth step;
in the above step ten, the nth device may be turned off when the set engine reduction delay time is reached, and the process may return to the step nine to perform the second determination when the set engine reduction delay time is not reached.
Based on the above, the invention has the advantages that the data are monitored in real time, the change trend control logic of the water temperature is obtained according to the algorithm, and the number of the started refrigeration equipment is adjusted according to the obtained change trend control logic of the water temperature, so that the problem of unnecessary starting and stopping of the equipment caused by water temperature fluctuation is solved, the actual refrigeration load demand can be responded in time, the operation of a cold station system is more stable, and unnecessary mechanical loss and energy consumption are reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A control method for judging whether to increase or decrease a unit in a cold station control system comprises the following steps: step one, monitoring data; substituting data; step three, judging data; step four, judging the increase of the engine; step five, returning data; step six, monitoring and judging; step seven, operation judgment is carried out; step eight, judging again; step nine, judging and returning; step ten, judging the reduction machine; the method is characterized in that:
in the first step, the temperature of the discharged water is respectively monitored in real time according to the number n of the running devices of the current equipmentT, water temperature set temperature TsTemperature T of equipmentIBuffer temperature difference TDAnd buffer temperature difference TB；
In the second step, the data to be monitored is substituted into a primary judgment formula to be judged by the primary judgment formula;
wherein in the third step, when the water temperature monitored in the first step is set to be TsTemperature T of equipmentIBuffer temperature difference TBWhen the water temperature T meets the primary judgment formula in the second step, the judgment of the delay time of the engine increase is carried out, and if the water temperature T does not meet the primary judgment formula, the judgment can be carried out by entering a secondary judgment formula;
in the fourth step, if the set engine increase delay time is up, the (n + 1) th equipment can be started, and if the set engine increase delay time is not up, the first step can be returned to for judging again;
in the fifth step, if the monitored data passes through the secondary judgment formula, the third judgment formula can be entered for carrying out judgment again, and if the secondary judgment formula is not met, the fourth judgment formula can be entered for carrying out judgment;
in the sixth step, if the monitored data meets the third judging formula, the step four can be entered, and if the monitored data does not meet the third judging formula, the step five can be returned to for judging again;
in the seventh step, when the monitored data passes through the fourth judgment formula, the judgment can be carried out by entering the fifth judgment formula, and if the monitored data does not pass through the fourth judgment formula, the judgment can be carried out again by returning to the second step;
in the eighth step, when the monitored data meets the fifth judgment formula, entering the sixth judgment formula for judgment, and if the monitored data does not meet the fifth judgment formula, returning to the seventh step for judgment again;
in the ninth step, when the monitored data passes through the judgment formula for six times, judgment can be carried out by reducing the delay time, and when the monitored data does not pass through the judgment formula for six times, judgment can be carried out again by returning to the eighth step;
in the above step ten, the nth device may be turned off when the set engine reduction delay time is reached, and the process may return to the step nine to perform the second determination when the set engine reduction delay time is not reached.
2. The control method for determining whether to increase or decrease the unit in the cold station control system according to claim 1, wherein: in the second step, the formula of one-time judgment is T > TS+TI+TB。
3. The control method for determining whether to increase or decrease the unit in the cold station control system according to claim 1, wherein: in the third step, the formula of secondary judgment is T > TS+TI。
4. The control method for determining whether to increase or decrease the unit in the cold station control system according to claim 1, wherein: in the fifth step, the formula is judged to be R for the third timeI> 1, and RIIs derived from the increasing trend factor algorithm, namely at TS+TI＜T＜TS+TI+TBIn the temperature interval, calculating the water temperature change PID value by using an increment PID formula algorithm, wherein the PID increment value is u (t) when the nth calculation period is startedn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; the PID increment value is u (t) when entering the n +1 part of calculation periodn+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]And f, the increasing trend factor is RI＝u(t)n+1-u(t)n。
5. The control method for determining whether to increase or decrease the unit in the cold station control system according to claim 1, wherein: in the fifth step, the formula of the fourth judgment is that T is less than TS-TD。
6. The control system of claim 1, wherein the control system determines whether to increase or decrease the unitsThe manufacturing method is characterized in that: in the seventh step, the formula of five times of judgment is that T is less than TS-TD-TB。
7. The control method for judging whether to increase or decrease the units in the cold station control system according to claim 1, wherein: in the eighth step, the formula is judged for six times as RD＞1，RDIs at TS-TD-TB＜T＜TS-TDIn the temperature interval, the PID increment value is u (t) when the nth calculation period is enteredn＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]}; the PID increment value is u (t) when entering the n +1 part of calculation periodn+1＝Kp*{T[t]-T[t-1]}+Ki*T(t)-Kd*{T[t]-2T[t-1]+T[t-2]Get the trend factor of machine reduction to RD＝u(t)n-u(t)n+1。
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| CN102536767B (en) * | 2012-01-04 | 2014-12-03 | 青岛海尔空调电子有限公司 | Compressor staring and stopping control method for water-cooling compressor set with compressors |
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