CN1869532A - Automatic control method for central cold supply system - Google Patents
Automatic control method for central cold supply system Download PDFInfo
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- CN1869532A CN1869532A CN 200610035191 CN200610035191A CN1869532A CN 1869532 A CN1869532 A CN 1869532A CN 200610035191 CN200610035191 CN 200610035191 CN 200610035191 A CN200610035191 A CN 200610035191A CN 1869532 A CN1869532 A CN 1869532A
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Abstract
The invention discloses an automatic control method of centralized cold providing system. It is a recurrent cold providing system which includes cooling water set, a frequency conversion pump, freezing water pipes net and the terminal air-condition units. The control method is that the recurrent cold proving system is disassembled many unattached control circle. A main control parameter and a regulable parameter are set in each circle. Through adjusting the parameters to adjust and control the change of the parameter, in different circles the control parameters and the regulable parameter interfere each other. The automatic control method provides a systemic solution for centralized cold providing system. It can comparatively separate the control of key equipments, such as the cold water motors, the frequency conversion pump, the adjusting valve etc. It deals with the influence of each other as a interferential variable to definitize the control target, run stably. So it can realize economizing energy and depressing the running cost.
Description
Technical field
The present invention relates to the automation control area of central cooling system, be specifically related to a kind of automation control method of central cooling system, comprise the variable frequency adjustment method of variable frequency pump, the aperture control method of control valve and the group control method of handpiece Water Chilling Units.
Background technology
Central cooling system is in concentrating the place's central refrigerating of cold station, by pump and chilled water pipe network the central refrigerating load is delivered to each end in real time then, realizing the automation control to the big regional large space environment temperature of far-end.Its control difficult point mainly contains:
1, each central cooling station will be controlled smart machines such as handpiece Water Chilling Units, variable frequency pump and overlaps more, and many of terminal combined air conditioners require the process variables of regulation and control a lot, belong to the multivariable regulating system, and relation factor is many, can't accurately set up the control model.
2, chilled water long transmission distance, the time prolongation of system is difficult to realize control in real time.
3, in control procedure, the flow of a pump will be as far as possible be complementary with the operational efficiency of cooling-water machine, the flow of secondary pump is wanted the demand of the terminal combined air conditioner of real-time tracking, many terminal combined air conditioner flows also to exist in adjustment process to interfere with each other, make flow regulating equipments such as variable frequency pump, control valve must take into account the adjusting and the coupling of multithread amount, the control meeting is through the saltus step back and forth between minimum of a value and the maximum of being everlasting routinely, system is very unstable, easily vibration.
4, owing to be subjected to the influence of factors such as season, outdoor environment temperature and terminal flow of the people variation, terminal combined air conditioner variation than big-difference can occur to the demand of chilled-water flow, if use the words of constant speed pump, then can not respond terminal changes in demand to refrigeration duty, thereby cause the energy consumption waste, increase operation cost.
Therefore, need to use variable frequency pump to adapt to the terminal variation that the refrigeration duty demand is reduced or increases, reduce or increase the running frequency of variable frequency pump fast, and then the feed flow of chilled water carried out dynamic fast the adjustment, improve the capability of fast response of central cooling system, flow matches problem when both having solved the chilled water remote transmission, energy-conservation than constant speed pump again, save operation cost.
Summary of the invention
The objective of the invention is at the problems referred to above, a kind of automation control method of central cooling system is provided, pass through system decoupling, central cooling system is decomposed into a plurality of independently control loops, by the team control of handpiece Water Chilling Units, the variable frequency adjustment method of variable frequency pump, the aperture control method of control valve etc., make and respectively control object in the system and control variables was both relatively independent, interdependence again, when variable frequency pump being regulated pressure reduction and the influence that causes when regulating environment temperature of control valve, and then accurately control chilled water pipe network pressure reduction and environment temperature to eliminate each disturbance variable.
For achieving the above object, the present invention adopts following technical scheme:
A kind of automation control method of central cooling system, comprise the circulation cold supply system of forming by handpiece Water Chilling Units, variable frequency pump, chilled water pipe network and terminal air-conditioning unit, described control method is meant the circulation cold supply system is decomposed into a plurality of independently control loops, set a main control variables in each control loop and adjust variable, regulate the variation of control variables by adjusting variable, control variables between the different loops and adjustment variable be disturbance variable each other.
According to the thought of pivot analysis method, many control objects in the above-mentioned circulation cold supply system and process control parameters are decomposed into following three control loops:
A) ring in---as innermost ring, environment temperature is as control variables with terminal air-conditioning unit and control valve thereof, and control valve opening is as adjusting variable;
B) ring in---as adapter ring, chilled water pipe network pressure reduction is as control variables with variable frequency pump and chilled water pipe network, and the running frequency of variable frequency pump is as adjusting variable;
C) outer shroud---as outer shroud, the output refrigeration duty of cooling-water machine is as control variables with handpiece Water Chilling Units, carries out the cooling-water machine team control in conjunction with the operational efficiency curve of cooling-water machine, realizes the control of cooling-water machine operation platform number and the setting again of chilled water leaving water temperature.
Above-mentioned cooling-water machine is the supplier of refrigeration duty Q, variable frequency pump and chilled water pipe network are the transmitter of refrigeration duty Q, terminal air conditioner is the consumer of refrigeration duty Q, wherein flow through pressure differential deltap P when control valve of the aperture ψ, MEDIA FLOW of refrigeration duty Q and control valve of control valve, temperature difference T three's product is directly proportional, that is: Q=K* ψ * Δ P* Δ T, wherein: Q is the refrigeration duty of terminal control valve of flowing through, K is a constant, ψ is the aperture of control valve, Δ T is the import/export temperature difference of chilled water flow when fan coil or combined air conditioner, and Δ P is the pressure reduction of chilled water flow when control valve.Eliminate the influence of Δ T variation by the interior ring in the tandem adjusting to system, with the influence of chilled water temperature difference Δ T as disturbance variable, with stable certain value that is controlled at technological requirement of pressure differential deltap P of chilled water pipe network, make the linear aperture ψ that follows the tracks of control valve of refrigeration duty of terminal control valve.
The end of chilled water pipe network is provided with bypass regulator valve in the above-mentioned central cooling system, when the required chilled water total flow of all terminal air conditioners during less than the output total amount of handpiece Water Chilling Units, open bypass regulator valve and enter adjustment state, realize the earial drainage of low discharge, make the flow matches of each loop.
In the adjustment process of whole terminal refrigeration duty, the aperture ψ of control valve is a pilot process variable, but the aperture ψ of control valve directly influences the response speed to end environmental temperature control, influences the following feature of refrigeration duty.Therefore, the present invention realizes the pivot governing factor that the aperture ψ of control valve treats as innermost ring by the control to control valve.Aperture at control valve is controlled to be the characteristics that nonlinear servo-actuated is controlled, and when system stable operation, the opening value of its control valve is uncertain.
Therefore, the two PID disturbance rejection regulative modes with Self Adaptive Control are adopted in the interior ring control of native system, may further comprise the steps: (a) gather of the feedback input of station environment temperature in real time as a PID adjuster, the station ambient temperature value that requires with working control compares, and eliminates the deviation that the station environment temperature is controlled by a PID adjuster; (b) adjust direction according to the aperture of the variation tendency forecast analysis control valve of actual environment temperature and given environment temperature, the opening value of control valve is dynamically revised; (c) revised opening value is acted on the 2nd PID adjuster, compare, eliminate the deviation of given aperture and actual motion aperture, realize stable control control valve opening ψ by the 2nd PID adjuster with the feedback aperture of control valve.
In the adjustment process of above-mentioned control valve opening, to the adjusting of control valve opening and outdoor environment temperature disturbance variable, obtain to meet the station environment temperature of technological requirement to refrigeration duty according to step (a); Dynamic given aperture according to actual temperature in the step (b) and given variation of temperature trend correction control valve; After according to step (c) given aperture self adaptation being adjusted, the actual aperture of control valve was both changed, can be stabilized near certain value the stable operation of acquisition control valve again regularly.
The whole freezing grid system of central cooling system can regard a closed container as, and the flow size of the unlatching platform number of cooling-water machine, chilled water pump, the aperture adjustment of control valve etc. all can influence pressure differential deltap P in chilled water pipe network system.Therefore, this programme is realized the main control variable of pressure differential deltap P as adapter ring by the running frequency adjustment to variable frequency pump.Running frequency at variable frequency pump is controlled to be nonlinear following control system, and when system stable operation, the running frequency value of its variable frequency pump is uncertain.
Therefore, the two PID disturbance rejection regulative modes with Self Adaptive Control are adopted in the middle ring control of native system, may further comprise the steps: (a) confession/backwater pressure reduction of outlet of real-time collecting variable frequency pump and terminal chilled water pipe network, feedback input as a PID adjuster, each concrete arm pressure reduction given with practical operation compares, and eliminates the deviation of actual pipeline pressure reduction and given pressure reduction by a PID adjuster; (b) adjust direction according to actual pressure differential with respect to the running frequency of the variation tendency forecast analysis variable frequency pump of given pressure reduction, the running frequency of variable frequency pump is dynamically revised; (c) with revised given frequency effect in the 2nd PID adjuster, compare with the feedback frequency of variable frequency pump, eliminate the deviation of given frequency and actual motion frequency by the 2nd PID adjuster, realize stable control to the variable frequency pump running frequency.
In the variable frequency adjustment process of above-mentioned variable frequency pump, according to step (a) running frequency and the control valve opening disturbance variable of variable frequency pump are regulated the variable frequency pump flow, obtain to meet the pressure reduction of technological requirement; Dynamic given running frequency according to the variation tendency correction variable frequency pump of actual pressure differential in the step (b) and given pressure reduction; To after adjusting in conjunction with actual given running frequency self adaptation, the running frequency of variable frequency pump was both changed according to step (c), can be stabilized in regularly again near certain value, obtain the stable operation of variable frequency pump.
Whole freezing grid system was a big energy storing system when central cooling system normally moved, cushioning effect is preferably arranged during to terminal refrigeration duty changes in demand, but analyze from long-play, the energy storage of system should be synchronous with the demand of terminal refrigeration duty as far as possible, preferably realizes the tracking control to terminal refrigeration duty demand.Energy storage is wanted suitably when being system boot, makes the response time of refrigeration duty tracking control short as far as possible; When normal operation, when bigger variation took place terminal refrigeration duty demand, the chilled water output temperature of reply cooling-water machine was revised, and made the response speed of refrigeration duty tracking control fast, in advance the refrigeration duty quantum of output of system is controlled, solved chilled water and transmit a big inertia and a long delay control difficult problem.
The control method of cooling-water machine output refrigeration duty may further comprise the steps in the native system outer shroud: (a) utilize the outdoor environment temperature prediction refrigeration duty excursion on the same day when system boot, determine the datum mark of refrigeration duty on the same day, make in the transient process of system boot system's storage cold suitable; When (b) system normally moves, utilize the variation of control valve opening and the variation of chilled water pipe network pressure reduction, the variation tendency of prediction refrigeration duty is revised the chilled water output temperature of cooling-water machine; (c) the refrigeration duty quantum of output of control system in advance, the response speed that makes refrigeration duty follow the tracks of control is obviously accelerated, and solves chilled water and transmits big inertia and control a difficult problem with long delay
In the adjustment process of above-mentioned cooling-water machine output refrigeration duty, according to the datum mark of step (a) prediction refrigeration duty on same day control; The variation tendency of refrigeration duty control during according to the normal operation of step (b) prediction; According to step (c) utilization the predicted value of refrigeration duty is regulated the refrigerating capacity output of cooling-water machine in advance, obtain system response time preferably.
Beneficial effect of the present invention is:
1) the full-automation control for the central cooling station provides systematically solution, can be by control relatively independent come of the present invention with key equipments such as cooling-water machine, variable frequency pump, control valves, disturbance quantity is used as in influence is each other handled, make control with clearly defined objective, system is stable.
2) can set up two PID disturbance rejection automatic regulating systems of central cooling variable frequency pump by the present invention, utilize this pair PID disturbance rejection automatic regulating system can accurately control chilled water pipe network pressure reduction, make near its certain value that is stabilized in technological requirement, and then reach energy-conservation and purpose that cut operating costs, may be used in the central cooling system of underground rail station central cooling system or many floors sub-district.
3) can set up two PID disturbance rejection automatic regulating systems of central cooling control valve by the present invention, utilize this pair PID disturbance rejection automatic regulating system temperature that can accurately control environment, make near its certain value that is stabilized in technological requirement, and then reach energy-conservation and purpose that cut operating costs, may be used in the terminal air-conditioning system of underground rail station central cooling system and all use combined air conditioner works.
Description of drawings
Fig. 1 is the tricyclic structure figure of central cooling system of the present invention;
Fig. 2 is the control flow block diagram of control valve of the present invention;
Fig. 3 is the control flow block diagram of variable frequency pump of the present invention;
Fig. 4 is the control flow block diagram of handpiece Water Chilling Units of the present invention.
The specific embodiment
As shown in Figure 1, the air-conditioning water system at whole cold station is decomposed into one three ring regulating system, thought according to the pivot analysis method, many control objects in the system and process control parameters are decomposed the consideration of coming, make cooling-water machine team control, variable frequency pump control, control valve control both relatively independent, depend on each other for existence again, control with clearly defined objective.Specifically describe as follows:
1, control object and control variables decoupling zero
1) with the control of terminal air conditioner and control valve thereof as interior ring, as control variables, control valve opening is as adjusting variable with environment temperature, other for example: chilled water temperature, the station volume of the flow of passengers, chilled water pressure reduction etc. are as disturbance variable;
2) with the control of variable frequency pump and chilled water pipe network as adapter ring, as control variables, the running frequency of variable frequency pump is as adjusting variable with chilled water pipe network pressure reduction, other for example: the aperture of control valve, chilled water temperature, environment temperature etc. are as disturbance variable;
3) with the team control of handpiece Water Chilling Units as outer shroud, with refrigeration duty as control variables, operational efficiency curve in conjunction with cooling-water machine carries out the cooling-water machine team control, realizes the control of cooling-water machine operation platform number and the setting again of chilled water leaving water temperature, with other factors as disturbance variable.
4) establish bypass regulator valve at the end of chilled water pipe network, when the required chilled water total flow of all terminal air-conditionings hour (less than the output total amount of handpiece Water Chilling Units), open bypass regulator valve and enter adjustment state, realize the earial drainage of low discharge, the flow matches of each link when making low discharge.
2, the control of control valve
As shown in Figure 2, the control method of central cooling of the present invention station control valve is at first with real-time collecting station site environment temperature T
f, as the feedback input of first PID adjuster, with the given station environment temperature T of practical operation
gCompare, eliminate actual environment temperature and given environment temperature T by the PID adjuster
gDeviation, realize accurate control to the station environment temperature.
With actual station temperature and given station temperature T
gVariation tendency D
T(or rate of change) is as the output of first PID adjuster.As variation tendency D
TBe timing, the aperture of determining control valve is to little direction adjustment, otherwise then to big direction adjustment.In addition, determine each step-length and adjustment cycle of adjusting, determine the dynamic correction value of aperture of control valve in view of the above, aperture set-point φ according to the value of rate of change
gRevised value acts on second PID adjuster, compares with actual aperture, eliminates given aperture φ by the PID adjuster
gWith the deviation of actual aperture, realize stable control to control valve.
3, the control of variable frequency pump
As shown in Figure 3, the variable frequency adjustment method of central cooling variable frequency pump of the present invention is at first with the outlet of real-time collecting variable frequency pump and terminal confession/backwater pressure differential deltap P
f, as the feedback input of first PID adjuster, with each given concrete arm pressure differential deltap P of practical operation
gCompare, regulate by PID and eliminate actual pipeline pressure reduction and given pressure differential deltap P
gDeviation, realize accurate control to pipeline pressure reduction.
With actual pressure differential and given pressure differential deltap P
gVariation tendency D
Δ P(or rate of change) is as the output of first PID adjuster.As variation tendency D
Δ PBe timing, the frequency of determining variable frequency pump is to little direction adjustment, otherwise then to big direction adjustment.In addition, determine each step-length and adjustment cycle of adjusting, determine the dynamic correction value of variable frequency pump running frequency in view of the above, given running frequency F according to the value of rate of change
gRevised value acts on second PID adjuster, compares with the actual motion frequency, eliminates given running frequency F by the PID adjuster
gWith the deviation of actual motion frequency, realize stable control to variable frequency pump.
The present invention is applied in the central cooling station system of No. two lines of Guangzhou Underground, concentrate cold station for four completely, when each pipeline pressure reduction control all can be carried out normal regulating according to the requirement of actual condition with the control of variable frequency pump running frequency, under the condition that satisfies terminal pressure reduction control, be 48.26% than the constant speed pump synthesis energy saving.
Concrete statistics such as following table:
| Sequence number | Cold station | Prop up tube loop | Design pressure difference | Actual motion pressure reduction | Running frequency mean value | The energy-conservation percentage of pump |
| 1 | Northern | Railway station (Δ P-B01) | 0.14MPa | 0.14MPa±0.01MPa | 32Hz | 59.04％ |
| 2 | Elegant more/museum (Δ P-B02) | 0.25MPa | 0.25MPa±0.02MPa | 34Hz | 53.76％ | |
| 3 | Hai Zhu | Before the park (Δ P-H01) | 0.2MPa | 0.2MPa±0.02MPa | 35Hz | 51％ |
| 4 | Hai Zhu | 0.07MPa | 0.07MPa±0.01MPa | 35Hz | 51％ | |
| 5 | Two palaces, city/west, the south of the River (Δ P-H02) | 0.25MPa | 0.25MPa±0.02MPa | 30Hz | 64％ | |
| 6 | The aigret river | In big/Xiao Gang (Δ P-L01) | 0.45MPa | 0.45MPa±0.02MPa | 42Hz | 29.44％ |
| 7 | Aigret Jiang Zhiguan (Δ P-L02) | 0.17MPa | 0.17MPa±0.01MPa | 45Hz | 19％ | |
| 8 | Visitor village/Chi Gang (Δ P-L03) | 0.4MPa | 0.4MPa±0.02MPa | 36Hz | 48.16％ | |
| 9 | Red sand | Mill butterfly sand (Δ P-C01) | 0.20MPa | 0.2MPa±0.02MPa | 32Hz | 59.04％ |
| 10 | New Gangdong/Pa state (Δ P-C02) | 0.35MPa | 0.35MPa±0.02MPa | 36Hz | 48.16 | |
| 11 | Pump is on average energy-conservation | 48.26％ |
4, the control of handpiece Water Chilling Units
Whole freezing grid system is a big energy storing system during normal the operation, cushioning effect is preferably arranged during to terminal refrigeration duty changes in demand, but analyze from long-play, the energy storage of system should be synchronous with the demand of terminal refrigeration duty as far as possible, preferably realizes the tracking control to terminal refrigeration duty demand.Energy storage is wanted suitably when being system boot, makes the response time of refrigeration duty tracking control short as far as possible; When normal operation, when bigger variation took place terminal refrigeration duty demand, the chilled water output temperature of reply cooling-water machine was revised, and made the response speed of refrigeration duty tracking control fast, in advance the refrigeration duty quantum of output of system was controlled.That is:
System the time utilizes the outdoor environment temperature prediction refrigeration duty excursion on the same day in start, determines the datum mark of refrigeration duty on the same day, makes in the transient process of system boot system's storage cold suitable.During normal the operation, utilize control valve opening to change and the variation of pipe network pressure reduction, the variation tendency of prediction refrigeration duty is revised the chilled water output temperature of cooling-water machine.
Predicted value size according to refrigeration duty, operational efficiency curve in conjunction with handpiece Water Chilling Units carries out team control to handpiece Water Chilling Units, determine the output temperature value of the operation platform number and the chilled water of cooling-water machine, in advance the refrigeration duty quantum of output of system is controlled, the response speed that makes refrigeration duty follow the tracks of control is obviously accelerated, and solves chilled water and transmits big inertia and long delay control problem.
As shown in Figure 4, the cooling-water machine group control method of central cooling system of the present invention at first utilizes outdoor environment temperature T when start
OutwardThe refrigeration duty excursion on prediction same day is determined the datum mark of refrigeration duty on the same day, with the station flow F of the terminal pipe network system in station of gathering in real time
Q, supply water temperature T
SupplyAnd return water temperature T
ReturnFeedback Q as terminal refrigeration duty
f, with the given refrigeration duty Q of practical operation
gCompare.Control valve opening rate of change, pipe network pressure reduction rate of change etc. and outdoor environment temperature T
OutwardAlso compare.Then, export above-mentioned two comparative result to load estimation unit, variation tendency by load estimation unit prediction refrigeration duty, and the chilled water output temperature of cooling-water machine is revised in advance by the cooling-water machine controller, make the response speed of refrigeration duty tracking control fast, in advance the refrigeration duty quantum of output of system is controlled, solved the big control problem long of chilled water transmission inertia with time-delay.
Claims (11)
1. the automation control method of a central cooling system, comprise the circulation cold supply system of forming by handpiece Water Chilling Units, variable frequency pump, chilled water pipe network and terminal air-conditioning unit, it is characterized in that, described control method is meant the circulation cold supply system is decomposed into a plurality of independently control loops, set a main control variables in each control loop and adjust variable, regulate the variation of control variables by adjusting variable, control variables between the different loops and adjustment variable be disturbance variable each other.
2. the automation control method of central cooling system according to claim 1 is characterized in that, the interdependence according between control object and the process control parameters is decomposed into following three control loops with described circulation cold supply system:
A) ring in---as innermost ring, environment temperature is as control variables with terminal air-conditioning unit and control valve thereof, and control valve opening is as adjusting variable;
B) ring in---as adapter ring, chilled water pipe network pressure reduction is as control variables with variable frequency pump and chilled water pipe network, and the running frequency of variable frequency pump is as adjusting variable;
C) outer shroud---as outer shroud, the output refrigeration duty of cooling-water machine is as control variables with handpiece Water Chilling Units, carries out the cooling-water machine team control in conjunction with the operational efficiency curve of cooling-water machine, realizes the control of cooling-water machine operation platform number and the setting again of chilled water leaving water temperature.
3. the automation control method of central cooling system according to claim 2, it is characterized in that, described cooling-water machine is the supplier of refrigeration duty Q, variable frequency pump and chilled water pipe network are the transmitter of refrigeration duty Q, terminal air conditioner is the consumer of refrigeration duty Q, wherein flow through pressure differential deltap P when control valve of the aperture ψ, MEDIA FLOW of refrigeration duty Q and control valve of control valve, temperature difference T three's product is directly proportional, that is: Q=K* ψ * Δ P* Δ T
Wherein: Q is the refrigeration duty of terminal control valve of flowing through, and K is a constant, and ψ is the aperture of control valve, and Δ T is the import/export temperature difference of chilled water flow when fan coil or combined air conditioner, and Δ P is the pressure reduction of chilled water flow when control valve.
4. the automation control method of central cooling system according to claim 3, it is characterized in that, with the influence of chilled water temperature difference Δ T as disturbance variable, with stable certain value that is controlled at technological requirement of pressure differential deltap P of chilled water pipe network, make the linear aperture ψ that follows the tracks of control valve of refrigeration duty of terminal control valve.
5. the automation control method of central cooling system according to claim 1, it is characterized in that, the end of chilled water pipe network is provided with bypass regulator valve in the described central cooling system, when the required chilled water total flow of all terminal air conditioners during less than the output total amount of handpiece Water Chilling Units, open bypass regulator valve and enter adjustment state, realize the earial drainage of low discharge, make the flow matches of each loop.
6. according to the automation control method of claim 2 or 3 described central cooling systems, it is characterized in that the control valve opening ψ in the described interior ring adopts two PID disturbance rejection regulative modes, may further comprise the steps:
A) gather the feedback input of station environment temperature as a PID adjuster in real time, the station ambient temperature value that requires with working control compares, and eliminates the deviation that the station environment temperature is controlled by a PID adjuster;
B) adjust direction according to the aperture of the variation tendency forecast analysis control valve of actual environment temperature and given environment temperature, the opening value of control valve is dynamically revised;
C) revised opening value is acted on the 2nd PID adjuster, compare, eliminate the deviation of given aperture and actual motion aperture, realize stable control control valve opening ψ by the 2nd PID adjuster with the feedback aperture of control valve.
7. the automation control method of central cooling system according to claim 6, it is characterized in that, in the adjustment process of described control valve opening, to the adjusting of control valve opening and outdoor environment temperature disturbance variable, obtain to meet the station environment temperature of technological requirement to refrigeration duty according to step a); Dynamic given aperture according to actual temperature in the step b) and given variation of temperature trend correction control valve; After according to step c) given aperture self adaptation being adjusted, the actual aperture of control valve was both changed, can be stabilized near certain value the stable operation of acquisition control valve again regularly.
8. according to the automation control method of claim 2 or 3 described central cooling systems, it is characterized in that the chilled water pipe network pressure differential deltap P in the described middle ring adopts two PID disturbance rejection regulative modes, may further comprise the steps:
A) confession/backwater pressure reduction of outlet of real-time collecting variable frequency pump and terminal chilled water pipe network, feedback input as a PID adjuster, each concrete arm pressure reduction given with practical operation compares, and eliminates the deviation of actual pipeline pressure reduction and given pressure reduction by a PID adjuster;
B) adjust direction according to actual pressure differential with respect to the running frequency of the variation tendency forecast analysis variable frequency pump of given pressure reduction, the running frequency of variable frequency pump is dynamically revised;
C) with revised given frequency effect in the 2nd PID adjuster, compare with the feedback frequency of variable frequency pump, eliminate the deviation of given frequency and actual motion frequency by the 2nd PID adjuster, realize stable control to the variable frequency pump running frequency.
9. the automation control method of central cooling system according to claim 8, it is characterized in that, in the variable frequency adjustment process of described variable frequency pump, according to step a) the running frequency and the control valve opening disturbance variable of variable frequency pump are regulated the variable frequency pump flow, obtain to meet the pressure reduction of technological requirement; Dynamic given running frequency according to the variation tendency correction variable frequency pump of actual pressure differential in the step b) and given pressure reduction; To after adjusting in conjunction with actual given running frequency self adaptation, the running frequency of variable frequency pump was both changed according to step c), can be stabilized in regularly again near certain value, obtain the stable operation of variable frequency pump.
10. according to the automation control method of claim 2 or 3 described central cooling systems, it is characterized in that the control method of cooling-water machine output refrigeration duty may further comprise the steps in the described outer shroud:
A) when system boot, utilize the outdoor environment temperature prediction refrigeration duty excursion on the same day, determine the datum mark of refrigeration duty on the same day, make in the transient process of system boot system's storage cold suitable;
When b) system normally moves, utilize the variation of control valve opening and the variation of chilled water pipe network pressure reduction, the variation tendency of prediction refrigeration duty is revised the chilled water output temperature of cooling-water machine;
C) the refrigeration duty quantum of output of control system in advance, the response speed that makes refrigeration duty follow the tracks of control is obviously accelerated, and solves chilled water and transmits big inertia and control a difficult problem with long delay
11. the automation control method of central cooling system according to claim 10 is characterized in that, in the adjustment process of cooling-water machine output refrigeration duty, predicts the datum mark of refrigeration duty control on the same day according to step a) in the described outer shroud; The variation tendency of refrigeration duty control during according to the normal operation of step b) prediction; According to the step c) utilization predicted value of refrigeration duty is regulated the refrigerating capacity output of cooling-water machine in advance, obtain system response time preferably.
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| CN102467587A (en) * | 2010-11-01 | 2012-05-23 | 财团法人工业技术研究院 | Dynamic characteristic model building method of chilling system, chilling system monitoring method and chilling method monitoring device |
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