CN107305055B - A kind of frequency-changing control system of water pump of central air conditioner - Google Patents
A kind of frequency-changing control system of water pump of central air conditioner Download PDFInfo
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- CN107305055B CN107305055B CN201610238636.9A CN201610238636A CN107305055B CN 107305055 B CN107305055 B CN 107305055B CN 201610238636 A CN201610238636 A CN 201610238636A CN 107305055 B CN107305055 B CN 107305055B
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- frequency
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Abstract
The invention discloses a kind of frequency-changing control systems of water pump of central air conditioner, including PLC controller, touch screen, frequency converter, water pump, differential pressure transmitter and flow transmitter, the PLC controller passes through frequency converter, water pump, differential pressure transmitter and flow transmitter respectively and connects with air-conditioner water system；Multiple water pumps are arranged in parallel between the frequency converter and air-conditioner water system, the differential pressure transmitter and flow transmitter are parallel between the PLC controller and air-conditioner water system, are provided with PID regulator in the PLC controller.The present invention will determine parallel connection pump quantity and desired operation frequency according to instantaneous flow value and system performance, then it is compared again by the differential pressure signal received with target differential pressure value, it is adjusted by PID, determines the actual motion frequency of parallel water pump, achieve the purpose that eliminate system spare lift.
Description
Technical field
The present invention relates to central air-conditioning control field, especially a kind of frequency-changing control system of water pump of central air conditioner.
Background technique
In the modern architecture using large-size air conditioning, the energy consumption of air-conditioning system accounts about 4 the percent of whole building energy consumption
Ten or more, so, the energy-saving design of air-conditioning system and reliable operation are at focus concerned by people.
When the number of users that air-conditioning uses varies widely, the quantity of circulating water of whole system will generate certain change,
This, which will lead to system, actually need to occur larger fluctuation with pressure difference.In actual operation, system differential pressure value always substantially exceeds system
Differential pressure value is designed, the huge waste of the energy is caused.Avoid this phenomenon, it is necessary to which control valve throttles in time by operation work
Or increasing water pump operation number of units to solve, this is undoubtedly increased largely manually, and causes the huge waste of the energy.
Summary of the invention
To solve the above problems, the present invention provides a kind of frequency-changing control system of water pump of central air conditioner, the air-conditioning frequency conversion control
System processed, it is intended to which system is picked out according to the instantaneous flow value of system by the utilization of computer and variable-frequency control technique automatically
Water pump optimum operation number of units and operating frequency, and realize the maximum operational efficiency of system, accomplish energy conservation truly.
The technical scheme is that
A kind of frequency-changing control system of water pump of central air conditioner, including PLC controller, frequency converter, water pump, differential pressure transmitter and
Flow transmitter, the PLC controller pass through frequency converter, water pump, differential pressure transmitter and flow transmitter and air conditioner water respectively
Cascade System；Multiple water pumps are arranged in parallel between the frequency converter and air-conditioner water system, the frequency converter is to make water pump
Realize that the controller of frequency control, the differential pressure transmitter and flow transmitter are parallel to the PLC controller and air-conditioning
Between water system, the differential pressure transmitter and flow transmitter are for the differential pressure of air-conditioner water system and flow signal to be converted into
Electric quantity signal gives PLC controller and carries out signal processing, is provided with PID regulator in the PLC controller.
Preferably, the PLC controller is also connected with touch screen, and the touch screen is for providing the man-machine boundary of PLC
Face, while being also used to display record system data statistics and historical data.
The control process of the PLC controller is:
(1), start with the starting of pump variable frequency until power frequency operation, and judge differential pressure actual sample value △ P whether
It is greater than the set value △ P0, as actual sample value △ P is less than setting value △ P0To restart second, third platform ..., to n-th, and
It is all run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid
With the running frequency for changing n platform pump lowerly, until practical differential pressure value △ P is substantially equal to setting value △ P0, record at this time be
Unite critical flow Q0, by looking into the controlling curve of the water pump system, (i.e. system performance curve moves up △ P0) and single pump is equivalent
Rate curve can determine and meet system critical flow Q0Water pump optimum operation number of units n, then the frequency conversion by looking into single pump is bent
Line acquires the optimum operation frequency of n platform pump at this time.
(2), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, work as flow
Knots modification Δ Q be greater than system design discharge certain percentage after, which will be in new flow Q0Under+Δ Q
The working frequency of water pump quantity and water pump required for meeting the differential pressure requirement of system is calculated according to step (1).
Preferably, the certain percentage refers to that the knots modification Δ Q of flow is greater than the 0.5% of system design discharge.Afterwards,
The frequency conversion system will be in new flow Q0The differential pressure requirement institute for meeting system is calculated under+Δ Q according to method as described in step (1)
The working frequency of the water pump quantity and water pump that need.
Preferably, the PLC controller is SIEMENS PLC controller, and the frequency converter is Danfoss frequency converter, institute
The differential pressure transmitter and flow transmitter stated are Siemens's transmitter.
Preferably, the touch screen is Siemens's touch screen.
The frequency-changing control system of a kind of water pump of central air conditioner of the invention, according to pump variable frequency curve and system performance curve
After calculating optimum operation mode, run n platform water pump under certain optimum frequency.It is practical with the continuous variation of user load
Differential pressure value can often be offset setting value.In order to which the remaining lift of the water pump system is eliminated at side bottom, this frequency-changing control system will make into
The PID of one step is adjusted.For system by the Real-time Feedback value of differential pressure transmitter compared with target set point, difference is admitted to PLC control
The inside PID regulator of device processed, after PID regulator operation, output frequency signal adjusts the speed water pump, is eliminated with reaching
The purpose of differential pressure dynamic deviation (e=0).
A kind of frequency-changing control system of water pump of central air conditioner of the invention will be determined according to instantaneous flow value and system performance
Then parallel connection pump quantity and desired operation frequency are compared by the differential pressure signal received with target differential pressure value again,
It is adjusted by PID, determines the actual motion frequency of parallel water pump, achieve the purpose that eliminate system spare lift.
It is calculated by the characteristic curve to water pump, determines the parallel operation number of units and working frequency of water pump, farthest
The working efficiency for playing water pump, to reach energy-efficient purpose.
Detailed description of the invention
Fig. 1 is a kind of control principle drawing of the frequency-changing control system of water pump of central air conditioner of the present invention；
Fig. 2 is a kind of system performance curve/controlling curve/tri- of the frequency-changing control system of water pump of central air conditioner of the present invention
The curve graph of water pump parallel connection frequency conversion characteristic；
Fig. 3 is a kind of single pump iso-efficiency curve/frequency conversion curve of the frequency-changing control system of water pump of central air conditioner of the present invention
Curve graph.
Appended drawing reference: 1-PLC controller, 2- touch screen, 3- frequency converter, 4- water pump, 5- differential pressure transmitter, 6- flow pick-up
Device, 7- air-conditioner water system.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment one
As shown in Figure 1, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency converter 3, water pump
4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure transmitter 5 respectively
It connects with flow transmitter 6 with air-conditioner water system；Multiple water pumps have been arranged in parallel between the frequency converter 3 and air-conditioner water system
4, the frequency converter 3 is the controller for making water pump 4 realize frequency control, and the differential pressure transmitter 5 and flow transmitter 6 are simultaneously
It is coupled between the PLC controller and air-conditioner water system, the differential pressure transmitter 5 and flow transmitter 6 are used for air-conditioning
The differential pressure and flow signal of water system are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, the PLC control
PID regulator is provided in device 1.
Embodiment two
As shown in Figure 1, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency converter 3, water pump
4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure transmitter 5 respectively
It connects with flow transmitter 6 with air-conditioner water system；Multiple water pumps have been arranged in parallel between the frequency converter 3 and air-conditioner water system
4, the frequency converter 3 is the controller for making water pump 4 realize frequency control, and the differential pressure transmitter 5 and flow transmitter 6 are simultaneously
It is coupled between the PLC controller and air-conditioner water system, the differential pressure transmitter 5 and flow transmitter 6 are used for air-conditioning
The differential pressure and flow signal of water system are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, the PLC control
PID regulator is provided in device 1.
The PLC controller 1 is also connected with touch screen 2, and the touch screen 2 is for providing the man-machine of PLC controller 1
Interface, while being also used to display record system data statistics and historical data.
Embodiment three
As shown in Figure 1, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency converter 3, water pump
4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure transmitter 5 respectively
It connects with flow transmitter 6 with air-conditioner water system；Multiple water pumps have been arranged in parallel between the frequency converter 3 and air-conditioner water system
4, the frequency converter 3 is the controller for making water pump 4 realize frequency control, and the differential pressure transmitter 5 and flow transmitter 6 are simultaneously
It is coupled between the PLC controller and air-conditioner water system, the differential pressure transmitter 5 and flow transmitter 6 are used for air-conditioning
The differential pressure and flow signal of water system are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, the PLC control
PID regulator is provided in device 1.
The PLC controller 1 is also connected with touch screen 2, and the touch screen 2 is for providing the man-machine of PLC controller 1
Interface, while being also used to display record system data statistics and historical data.
The control process of the PLC controller 1 is:
(1), start with the starting of pump variable frequency until power frequency operation, and judge differential pressure actual sample value △ P whether
It is greater than the set value △ P0, as actual sample value △ P is less than setting value △ P0To restart second, third platform ..., to n-th, and
It is all run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid
With the running frequency for changing n platform pump lowerly, until practical differential pressure value △ P is substantially equal to setting value △ P0, record at this time be
Unite critical flow Q0, by looking into the controlling curve of the water pump system, (i.e. system performance curve moves up △ P0) (Fig. 2) and single pump
Iso-efficiency curve (Fig. 3) can determine the optimum operation number of units n of water pump, then the frequency conversion curve by looking into single pump, acquire at this time
N platform pump optimum operation frequency.
(2), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, work as flow
Knots modification (Δ Q) be greater than system design discharge certain percentage after, which will be in new flow Q0+ΔQ
The lower working frequency for calculating water pump quantity and water pump required for meeting the differential pressure requirement of system.
Example IV
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency conversion
Device 3, water pump 4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure respectively
Transmitter 5 and flow transmitter 6 are connected with air-conditioner water system；It has been arranged in parallel between the frequency converter 3 and air-conditioner water system
Multiple water pumps 4, the frequency converter 3 are the controller for making water pump 4 realize frequency control, the differential pressure transmitter 5 and flow
Transmitter 6 is parallel between the PLC controller and air-conditioner water system, and the differential pressure transmitter 5 and flow transmitter 6 are used
In the differential pressure of air-conditioner water system and flow signal are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, it is described
PLC controller 1 in be provided with PID regulator.
The PLC controller 1 is also connected with touch screen 2, and the touch screen 2 is for providing the man-machine of PLC controller 1
Interface, while being also used to display record system data statistics and historical data.
The control process of the PLC controller 1 is:
(1), start with the starting of pump variable frequency until power frequency operation, and judge differential pressure actual sample value △ P whether
It is greater than the set value △ P0, as actual sample value △ P is less than setting value △ P0To restart second, third platform ..., to n-th, and
It is all run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid
With the running frequency for changing n platform pump lowerly, until practical differential pressure value △ P is substantially equal to setting value △ P0, record at this time be
Unite critical flow Q0, by looking into the controlling curve of the water pump system, (i.e. system performance curve moves up △ P0) (Fig. 2) and single pump
Iso-efficiency curve (Fig. 3) can determine the optimum operation number of units n of water pump, then the frequency conversion curve by looking into single pump, acquire at this time
N platform pump optimum operation frequency.
(2), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, work as flow
Knots modification Δ Q be greater than system design discharge 0.5%(it is most energy saving at 0.5%) after, which will be in new stream
Measure Q0The working frequency of water pump quantity and water pump required for meeting the differential pressure requirement of system is calculated under+Δ Q.
Embodiment five
As shown in Figure 1, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency converter 3, water pump
4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure transmitter 5 respectively
It connects with flow transmitter 6 with air-conditioner water system；Multiple water pumps have been arranged in parallel between the frequency converter 3 and air-conditioner water system
4, the frequency converter 3 is the controller for making water pump 4 realize frequency control, and the differential pressure transmitter 5 and flow transmitter 6 are simultaneously
It is coupled between the PLC controller and air-conditioner water system, the differential pressure transmitter 5 and flow transmitter 6 are used for air-conditioning
The differential pressure and flow signal of water system are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, the PLC control
PID regulator is provided in device 1.
The PLC controller 1 is also connected with touch screen 2, and the touch screen 2 is for providing the man-machine of PLC controller 1
Interface, while being also used to display record system data statistics and historical data.
The control process of the PLC controller 1 is:
(1), start with the starting of pump variable frequency until power frequency operation, and judge differential pressure actual sample value △ P whether
It is greater than the set value △ P0, as actual sample value △ P is less than setting value △ P0To restart second, third platform ..., to n-th, and
It is all run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid
With the running frequency for changing n platform pump lowerly, until practical differential pressure value △ P is substantially equal to setting value △ P0, record at this time be
Unite critical flow Q0, by looking into the controlling curve of the water pump system, (i.e. system performance curve moves up △ P0) and single pump is equivalent
Rate curve can determine the optimum operation number of units n of water pump, then the frequency conversion curve by looking into single pump, acquire n platform pump at this time
Optimum operation frequency.
(2), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, work as flow
Knots modification Δ Q be greater than system design discharge 0.5% after, which will be in new flow Q0It is calculated under+Δ Q full
The working frequency of water pump quantity and water pump required for the differential pressure of pedal system requires.
The PLC controller 1 is SIEMENS PLC controller, and the frequency converter 3 is Danfoss frequency converter, described
Differential pressure transmitter 5 and flow transmitter 6 are Siemens's transmitter.
Embodiment six
As shown in Figure 1, a kind of frequency-changing control system of water pump of central air conditioner, including PLC controller 1, frequency converter 3, water pump
4, differential pressure transmitter 5 and flow transmitter 6, the PLC controller 1 pass through frequency converter 3, water pump 4, differential pressure transmitter 5 respectively
It connects with flow transmitter 6 with air-conditioner water system；Multiple water pumps have been arranged in parallel between the frequency converter 3 and air-conditioner water system
4, the frequency converter 3 is the controller for making water pump 4 realize frequency control, and the differential pressure transmitter 5 and flow transmitter 6 are simultaneously
It is coupled between the PLC controller and air-conditioner water system, the differential pressure transmitter 5 and flow transmitter 6 are used for air-conditioning
The differential pressure and flow signal of water system are converted into electric quantity signal, give PLC controller 1 and carry out signal processing, the PLC control
PID regulator is provided in device 1.
The PLC controller 1 is also connected with touch screen 2, and the touch screen 2 is for providing the man-machine of PLC controller 1
Interface, while being also used to display record system data statistics and historical data.
The control process of the PLC controller 1 is:
(3), start with the starting of pump variable frequency until power frequency operation, and judge differential pressure actual sample value △ P whether
It is greater than the set value △ P0, as actual sample value △ P is less than setting value △ P0To restart second, third platform ..., to n-th, and
It is all run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid
With the running frequency for changing n platform pump lowerly, until practical differential pressure value △ P is substantially equal to setting value △ P0, record at this time be
Unite critical flow Q0, by looking into the controlling curve of the water pump system, (i.e. system performance curve moves up △ P0) and single pump is equivalent
Rate curve can determine the optimum operation number of units n of water pump, then the frequency conversion curve by looking into single pump, acquire n platform pump at this time
Optimum operation frequency.
(4), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, work as flow
Knots modification Δ Q be greater than system design discharge 0.5% after, which will be in new flow Q0It is calculated under+Δ Q full
The working frequency of water pump quantity and water pump required for the differential pressure of pedal system requires.
The PLC controller 1 is SIEMENS PLC controller, and the frequency converter 3 is Danfoss frequency converter, described
Differential pressure transmitter 5 and flow transmitter 6 are Siemens's transmitter.
The touch screen 2 is Siemens's touch screen.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to of the invention
Protection scope.
Claims (5)
1. a kind of frequency-changing control system of water pump of central air conditioner, which is characterized in that including PLC controller, frequency converter, water pump, difference
Pressure transmitter and flow transmitter, the PLC controller pass through frequency converter, water pump, differential pressure transmitter and flow pick-up respectively
Device is connected with air-conditioner water system；Multiple water pumps, the frequency conversion have been arranged in parallel between the frequency converter and air-conditioner water system
Device is the controller for making water pump realize frequency control, and the differential pressure transmitter and flow transmitter are parallel to the PLC control
Between device and air-conditioner water system processed, the differential pressure transmitter and flow transmitter are used for the differential pressure and flow of air-conditioner water system
Signal is converted into electric quantity signal, gives PLC controller and carries out signal processing, PID adjusting is provided in the PLC controller
Device, the control process of the PLC controller are as follows:
(1), start with a pump variable frequency starting up to power frequency operation, and judge whether the actual sample value △ P of differential pressure is greater than
Setting value △ P0, as actual sample value △ P is less than setting value △ P0Second will be restarted, third platform ..., existed to n-th, and all
It is run under power frequency, until actual sample value △ P is greater than the set value △ P0, then adjusted again by PID regulator, ibid under
Ground changes the running frequency of n platform pump, until practical differential pressure value △ P is substantially equal to setting value △ P0, the system recorded at this time faces
Boundary flow Q0, by looking into the controlling curve of the water pump system and the iso-efficiency curve of single pump, can determine that meet system critical
Flow Q0Water pump optimum operation number of units n, then the frequency conversion curve by looking into single pump acquires the optimum operation of n platform pump at this time
Frequency.
(2), when latter end differential pressure changes, PID regulator will change the frequency of frequency converter, to change flow, when changing for flow
After variable Δ Q is greater than the certain percentage of system design discharge, which will be in new flow Q0Under+Δ Q according to
Step (1) calculates the working frequency of water pump quantity and water pump required for meeting the differential pressure requirement of system；
Wherein, the controlling curve of water pump system is that system performance curve translates up △ P0It obtains.
2. the frequency-changing control system of water pump of central air conditioner according to claim 1, which is characterized in that the PLC control
Device is also connected with touch screen, and the touch screen is also used to display record system data for providing the man-machine interface of PLC
Statistics and historical data.
3. the frequency-changing control system of water pump of central air conditioner according to claim 1, which is characterized in that certain percentage
Than referring to that the knots modification Δ Q of flow is greater than the 0.5% of system design discharge.
4. the frequency-changing control system of water pump of central air conditioner according to claim 1, which is characterized in that the PLC control
Device is SIEMENS PLC controller, and the frequency converter is Danfoss frequency converter, and the differential pressure transmitter and flow transmitter are
Siemens's transmitter.
5. the frequency-changing control system of water pump of central air conditioner according to claim 2, which is characterized in that the touch screen is
Siemens's touch screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610238636.9A CN107305055B (en) | 2016-04-18 | 2016-04-18 | A kind of frequency-changing control system of water pump of central air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610238636.9A CN107305055B (en) | 2016-04-18 | 2016-04-18 | A kind of frequency-changing control system of water pump of central air conditioner |
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| CN107305055B true CN107305055B (en) | 2019-09-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131281A (en) * | 2017-12-21 | 2018-06-08 | 北京慧鎏科技有限公司 | Water pump control method, device and electronic equipment |
| CN108981071A (en) * | 2018-07-17 | 2018-12-11 | 珠海格力电器股份有限公司 | A kind of frequency adjusting method of refrigerating water pump, device and air-conditioning equipment |
| CN110939560B (en) * | 2019-11-04 | 2021-09-14 | 姚福来 | Method for determining electricity-saving optimization operation and switching point of water pump unit |
| CN114413458B (en) * | 2022-01-25 | 2022-12-09 | 清华大学 | Water pump parallel operation control method, device, equipment and medium for air-conditioning water system |
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| CN201503103U (en) * | 2009-08-27 | 2010-06-09 | 上海航嘉电子有限公司 | Air conditioner variable-frequency controller |
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