CN117927494A - Method and system for controlling air compressor - Google Patents
Method and system for controlling air compressor Download PDFInfo
- Publication number
- CN117927494A CN117927494A CN202410129123.9A CN202410129123A CN117927494A CN 117927494 A CN117927494 A CN 117927494A CN 202410129123 A CN202410129123 A CN 202410129123A CN 117927494 A CN117927494 A CN 117927494A
- Authority
- CN
- China
- Prior art keywords
- air compressor
- control
- air
- flow
- term
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001276 controlling effect Effects 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007774 longterm Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
The application relates to the field of air compressors, in particular to a method and a system for controlling an air compressor, which comprise the air compressor, a flowmeter communicated with the air compressor, a speed regulator for controlling the rotation speed of a main shaft of the air compressor, an air storage tank for storing compressed air, an air compressor output valve arranged between the air storage tank and the air compressor, an output pipeline for outputting the compressed air and a system output valve arranged between the output pipeline and the air storage tank; the speed regulator can change the flow of the air compressor after regulating the rotating speed of the main shaft of the air compressor, and the air compressor further comprises a control system, wherein a pressure sensor is further arranged between the system output valve and the air storage tank, and the pressure sensor, the flowmeter and the control system are connected. The application has the effect of realizing stable adjustment of the air compressor system.
Description
Technical Field
The application relates to the field of air compressors, in particular to a method and a system for controlling an air compressor.
Background
An air compressor is a device for compressing a gas. In a wide industrial field, a large number of air compressors are required to provide the compressed air required for production. Common industrial air compressors include screw type, centrifugal type, axial flow type and the like, and the capacity is sequentially increased. The air compressor is usually combined with a valve, an air storage tank, an output pipeline, a speed regulator and the like to form a system. In order to achieve a stable supply of compressed air, it is often necessary to control the air pressure of the output duct such that the pressure of the compressed air of the output duct is substantially fixed. The output air pressure is mainly influenced by two factors of the flow and the output flow of the air compressor, and when the flow of the air compressor is larger than the output flow, the air pressure of the air storage tank and the output pipeline is gradually increased; when the flow of the air compressor is smaller than the output flow, the air pressure of the air storage tank and the output pipeline gradually drops; when the air compressor flow is exactly equal to the output flow, the air pressure of the air storage tank and the output pipeline is kept unchanged.
At present, a centrifugal air compressor and an axial flow air compressor used in large industrial occasions are easy to cause surge working conditions, namely working conditions of high output pressure and small air compressor flow, due to the inherent surge characteristic of the centrifugal air compressor and the axial flow air compressor, so that the safe operation of the air compressor is threatened. Surging typically occurs at high output pressures and low air compressor flows, which can damage the air compressor in a short period of time. Therefore, reasonable control methods should be adopted to avoid surge conditions. On the other hand, since the air tank has a certain capacity, particularly, there is a long-time hysteresis, and air has elasticity and expansibility, the control of air pressure is very difficult. The rotation speed of the air compressor continuously fluctuates greatly and periodically, the air compressor cannot be stabilized in a narrow range, the stability of air pressure is poor, frequent surge phenomena of the centrifugal air compressor and the axial flow air compressor are caused, and reliable online real-time adjustment cannot be realized.
Disclosure of Invention
In order to realize stable adjustment of an air compressor system, the application provides a method and a system for controlling an air compressor.
The application provides a method and a system for controlling an air compressor, which adopts the following technical scheme:
A method and system for controlling an air compressor, comprising: the device comprises an air compressor, a flowmeter, a speed regulator, an air storage tank, an air compressor output valve, an output pipeline and a system output valve, wherein the flowmeter is communicated with the air compressor;
The speed regulator can change the flow of the air compressor after regulating the rotating speed of the main shaft of the air compressor, and the air compressor further comprises a control system, wherein a pressure sensor is further arranged between the system output valve and the air storage tank, and the pressure sensor, the flowmeter and the control system are connected.
Through adopting above-mentioned technical scheme, the speed regulator is used for controlling the rotational speed of air compressor machine main shaft, and then the compressibility of air compressor machine has been controlled, output compressed air's pressure promptly, reach the effect of changing the flow, the flowmeter is used for recording the flow condition of air compressor machine entering air, and in this partial data transmission to control system, make things convenient for control system to monitor the flow in the air compressor machine, when the inside flow of air compressor machine needs to be changed, send the command to the speed regulator through control system, and then change the rotational speed of air compressor machine, thereby reach the effect of changing the air compressor machine flow in real time, the numerical value of air pressure of pressure sensor orientation control system real time transmission output, control system judges according to the information, send rotational speed instruction to the speed regulator according to the demand, make the speed regulator control air compressor machine main shaft rotational speed, and then control output flow.
Preferably, the air compressor is communicated with an air inlet, the air inlet is used for sucking air, the air enters the air compressor from the air inlet, the air compressor output valve is opened when the air compressor operates, the air compressor output valve is communicated with compressed air, and the compressed air enters the air storage tank for buffering and is output through the system output valve;
The flow meter transmits the transmission air inlet flow to the control system, the pressure sensor transmits the compressed air pressure value to the control system, and the control system determines whether to send a rotating speed instruction to the speed regulator according to the information transmitted by the flow meter and the pressure sensor, namely, controls the air compressor.
By adopting the technical scheme, the pressure sensor monitors, the output air pressure is found to be insufficient at a certain moment and is lower than the set value, at the moment, a control system sends a command to the speed regulator to increase the rotating speed of the air compressor, the flowmeter monitors the flow of air entering, and the rotating speed of the air compressor is adjusted in real time according to the air pressure condition; the hysteresis phenomenon of the air storage tank is avoided, the continuous occurrence of large-amplitude and periodic fluctuation of the rotating speed of the air compressor is avoided, the air pressure is stabilized in a narrower range, the stability of the air pressure is improved, the frequent surge phenomenon of the centrifugal air compressor and the axial flow air compressor is avoided, and the air pressure is reliably regulated on line in real time.
Preferably, the air compressor is controlled by a system for controlling the air compressor, wherein the system for controlling the air compressor comprises a flowmeter, the air compressor, a speed regulator, a pressure sensor and a control system, and the method for controlling the air compressor is realized based on the control system; the control system has a separate control method comprising:
calculating the control error at intervals;
Calculating a proportional term, a differential term and an integral term of the control;
Calculating the total control value and performing amplitude limiting;
Calculating the absolute value of the error, and judging and operating the control dead zone according to the absolute value of the error;
the total control quantity is converted into flow after being calculated;
And limiting the flow, and controlling the flow to a required value.
By adopting the technical scheme, the meaning of entering the dead zone is that the refreshing of the set value of the air compressor is stopped, so that the air compressor continuously flows at present, if the dead zone is jumped out, the continuity of the value after the dead zone is jumped out needs to be ensured, the fluctuation of air pressure in the set range can be tolerated through the judgment of the dead zone entering and the dead zone exiting, the frequent repeated adjustment is avoided, and the control quantity can be kept stable as far as possible.
Preferably, the calculating the absolute value of the error, and the judging and operating of the control dead zone according to the absolute value of the error, includes the steps of:
If the absolute value of the control error is smaller than or equal to the set threshold value, the dead zone entering counter is subjected to accumulation operation, and the dead zone exiting counter is subjected to zero clearing:
if the duration is long enough, the dead zone counter is entered at this time to exceed the set threshold value, and the dead zone is entered.
By adopting the technical scheme, the absolute value of the error is compared with the threshold value, and whether the dead zone entering counter or the dead zone exiting counter is operated is determined by the value.
Preferably, when the dead zone is present, the calculation method of the integral term of the calculation control is different, and the integral term of the calculation control is reversed at this time:
In the dead zone state, the integral term of the control is the value of the control quantity minus the proportional term of the control, and the differential term of the control.
By adopting the technical scheme, the follow-up maintenance control quantity is ensured to be constant in value, the set flow of the air compressor is continuous, and the wide fluctuation is avoided.
Preferably, if the absolute value of the error is greater than the set threshold value, accumulating the dead zone counter and resetting the dead zone counter;
if the duration is long enough, the dead zone counter exceeds a set threshold value, the dead zone is jumped out, and the control quantity is calculated according to the proportional term of the control, the integral term of the control and the differential term of the control at the time.
By adopting the technical scheme, the integral term is calculated in the dead zone and is not obtained by long-term integration, but is reversely calculated by the value of the total control quantity in the dead zone, so that the continuity of the value of the total control quantity after the dead zone is jumped out can be ensured, and the jump of the control quantity can not occur; through the judgment of the 'dead zone in' and the 'dead zone out', the fluctuation of the air pressure in a set range can be tolerated, frequent repeated adjustment is avoided, and the control quantity can be maintained as stable as possible.
Preferably, the limiting the flow, controlling the flow to a desired value, includes the steps of:
if the flow is not higher than the surge flow, the flow=surge flow+safety margin.
Preferably, the desired flow rate is obtained by measuring the intake air flow rate of the air compressor in real time and controlling the rotation speed by PID (process controller).
Preferably, the calculating the control error at intervals includes the steps of:
when calculating the control error value, the control error=given air pressure-actual air pressure.
Preferably, the calculating the proportional term, the differential term, and the integral term of the control specifically includes the steps of:
Calculating a proportional term, wherein the proportional term is controlled by the product of the proportional coefficient and the control error value;
calculating a differential term, wherein the differential term of control is the product of a differential coefficient and a control error value;
And calculating an integral term, wherein the controlled integral term is the sum of the controlled integral term and the controlled proportional term.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The speed regulator is used for controlling the rotational speed of air compressor machine main shaft, and then the compressibility of air compressor machine has been controlled, output compressed air's pressure promptly, reach the effect of change flow, the flowmeter is used for taking notes the air compressor machine and gets into the flow condition of air, and in this partial data transmission to control system, make things convenient for control system to monitor the flow in the air compressor machine, when the inside flow of air compressor machine needs to be changed, send the command to the speed regulator through control system, and then change the rotational speed of air compressor machine, thereby reach the effect of changing the air compressor machine flow in real time, pressure sensor transmits the numerical value of the air pressure of output towards control system in real time, control system judges according to the information, send the rotational speed command to the speed regulator according to the demand, make the speed regulator control air compressor machine main shaft rotational speed, and then control output flow.
Drawings
Fig. 1 is a schematic structural view of a hollow body according to an embodiment of the present application.
Reference numerals illustrate: 1. a flow meter; 2. an air compressor; 3. a speed governor; 4. an output valve of the air compressor; 5. a gas storage tank; 6. a system output valve; 7. an output pipe; 8. a pressure sensor; 9. and a control system.
Detailed Description
The output air pressure is mainly influenced by two factors of the flow and the output flow of the air compressor. When the flow of the air compressor is larger than the output flow, the air pressure of the air storage tank and the output pipeline is gradually increased; when the flow of the air compressor is smaller than the output flow, the air pressure of the air storage tank and the output pipeline gradually drops; when the air compressor flow is exactly equal to the output flow, the air pressure of the air storage tank and the output pipeline is kept unchanged. In order to control the air pressure of the pipeline, the flow rate needs to be taken into consideration, and the pressure of the output pipeline is adjusted through the adjustment of the flow rate.
Meanwhile, a centrifugal air compressor and an axial flow air compressor used in large industrial occasions are easy to cause surge working conditions due to the inherent surge characteristics of the centrifugal air compressor and the axial flow air compressor, and the safe operation of the air compressor is threatened. Surging typically occurs at high output pressures and low air compressor flows. For example: when the air pressure of the output pipeline is found to be higher at a certain moment, the rotating speed of the air compressor is supposed to be reduced at the moment, so that the flow of the air compressor is reduced, and the air pressure of the output pipeline is expected to be gradually reduced. However, if the rotation speed and the flow of the air compressor are reduced, the working conditions of high output pressure and small flow of the air compressor, namely the surge working condition, are just constructed, so that the centrifugal air compressor and the axial flow air compressor are in surge, and the air compressor can be damaged in a short time. Therefore, reasonable control methods should be adopted to avoid surge conditions.
On the other hand, since the air tank has a certain capacity, particularly, there is a long-time hysteresis, and air has elasticity and expansibility, the control of air pressure is very difficult. For example: when the output air pressure is found to be insufficient at a certain moment and lower than the set value, the rotating speed of the air compressor is increased at the moment, but the air pressure is not increased as expected due to hysteresis generated by the large capacity of the air storage tank, and the rotating speed has to be continuously increased until the rotating speed reaches the maximum rotating speed. Then, when the air pressure is gradually accumulated, the output air pressure is found to be higher than the set value, the rotating speed has to be reduced again, and the air pressure is not reduced as expected due to the hysteresis of the air storage tank, so that the rotating speed is continuously reduced to the minimum value, and the air pressure is insufficient after a certain time. The process is repeated continuously, so that the rotating speed of the air compressor continuously fluctuates greatly and periodically, the air compressor cannot be stabilized in a narrow range, the stability of air pressure is poor, frequent surge phenomena of the centrifugal air compressor and the axial flow air compressor can be caused, and reliable online real-time adjustment cannot be realized at all. The device is also a main reason that the conventional centrifugal air compressor and axial flow air compressor can not realize online real-time speed regulation.
The embodiment of the application discloses a method and a system for controlling an air compressor. The present application will be described in further detail with reference to fig. 1.
Referring to fig. 1, a system of an air compressor includes an air compressor, a flow meter communicated with the air compressor, a speed regulator controlling a rotational speed of a main shaft of the air compressor, an air storage tank for storing compressed air, an air compressor output valve disposed in front of the air storage tank and the air compressor, an output pipe for outputting the compressed air, and a system output valve disposed between the output pipe and the air storage tank. The speed regulator can change the flow of the air compressor after regulating the rotation speed of the main shaft of the air compressor, and the air compressor further comprises a control system, wherein a pressure sensor is further arranged between the system output valve and the air storage tank, and the pressure sensor and the flow meter are connected with the control system.
The speed regulator is used for controlling the rotational speed of air compressor machine main shaft, and then the compressibility of air compressor machine has been controlled, output compressed air's pressure promptly, reach the effect of change flow, the flowmeter is used for taking notes the air compressor machine and gets into the flow condition of air, and in this partial data transmission to control system, make things convenient for control system to monitor the flow in the air compressor machine, when the inside flow of air compressor machine needs to be changed, send the command to the speed regulator through control system, and then change the rotational speed of air compressor machine, thereby reach the effect of changing the air compressor machine flow in real time, pressure sensor transmits the numerical value of the air pressure of output towards control system in real time, control system judges according to the information, send the rotational speed command to the speed regulator according to the demand, make the speed regulator control air compressor machine main shaft rotational speed, and then control output flow.
The air compressor is communicated with an air inlet, the air inlet is used for sucking air, the air enters the air compressor from the air inlet, the air compressor output valve is opened when the air compressor operates, the air compressor output valve is communicated with compressed air, and the compressed air enters the air storage tank for buffering and is output through the system output valve;
The flow meter transmits the inlet air flow to the control system, the pressure sensor wants to transmit the compressed air pressure value to the control system, and the control system determines whether to send a rotating speed instruction to the speed regulator according to the information transmitted by the flow meter and the pressure sensor, namely, controls the air compressor. Monitoring by a pressure sensor, finding that the output air pressure is insufficient at a certain moment and is lower than a set value, sending a command to a speed regulator by a control system at the moment to increase the rotating speed of the air compressor, and monitoring the flow of air entering by a flowmeter to adjust the rotating speed of the air compressor in real time according to the air pressure condition; the hysteresis phenomenon of the air storage tank is avoided, the continuous occurrence of large-amplitude and periodic fluctuation of the rotating speed of the air compressor is avoided, the air pressure is stabilized in a narrower range, the stability of the air pressure is improved, the frequent surge phenomenon of the centrifugal air compressor and the axial flow air compressor is avoided, and the air pressure is reliably regulated on line in real time.
In an alternative example, to achieve a stable supply of compressed air, it is often necessary to control the air pressure of the output duct such that the pressure of the compressed air of the output duct is substantially fixed. For example, the compressed air used for pressure swing adsorption nitrogen production should be maintained at about 0.70MPa and the air pressure for instrument air should be maintained at about 0.55MPa. After the data content transmitted by the flowmeter and the pressure sensor is processed and judged, a control system sends a rotating speed instruction to the speed regulator, the rotating speed of the main shaft of the air compressor is changed according to actual conditions, and then the pressure of the air compressor is changed, so that the surge phenomenon is avoided.
The method for controlling the air compressor is realized based on a control system, the control system performs control calculation by measuring the air inlet flow of the air compressor and the output air pressure of the air storage tank and adopting a built-in method to output a rotating speed instruction, so that the speed regulator regulates the rotating speed of the air compressor according to the control instruction, and finally, a control target is realized; the control system has a separate control method comprising:
S1, calculating the control error once at intervals;
The error is calculated by the control error value measured at the kth time=given air pressure-actual air pressure.
After calculating the control error, the control error queue in the control system needs to be updated, when the control error queue in the control system is updated, the k+1th measured error value=the k-th measured error value, the k-th measured error value=the k-1 th measured error value, and the first measured error value=the set error value, and the k-th measured error value=the set error value.
S2, calculating a proportional term, a differential term and an integral term of the control;
When calculating the proportional term, the proportional term is controlled as the product of the proportional coefficient and the control error value;
when calculating the differential term, the differential term of control is the product of the differential coefficient and the control error value;
When calculating the integral term, the controlled integral term is the sum of the controlled integral term and the controlled proportional term.
S3, calculating a total control value and limiting amplitude;
total control magnitude = proportional term + differential term + integral term.
S4, calculating an absolute value of the error, and judging and operating a control dead zone according to the absolute value of the error;
Calculating the absolute value of the error, and judging and operating the control dead zone according to the absolute value of the error, wherein the method comprises the following steps:
If the absolute value of the control error is smaller than or equal to the set threshold value, the dead zone entering counter is subjected to accumulation operation, and the dead zone exiting counter is subjected to zero clearing:
If the duration is long enough, the dead zone counter is entered at this time to exceed the set threshold value, and the dead zone is entered. The absolute value of the error is compared with a threshold value, and whether the entering dead zone counter or the exiting dead zone counter is operated is determined through the value.
When the dead zone is present, the calculation method of the integral term of the calculation control is different, and the integral term of the calculation control is reversed at this time:
In the dead zone state, the integral term of the control is the value of the control quantity minus the proportional term of the control, and the differential term of the control. The subsequent constant value of the control quantity is ensured, the set flow of the air compressor is continuous, and the large-range fluctuation is avoided.
If the absolute value of the error is larger than the set threshold value, accumulating the dead zone counter, and resetting the dead zone counter;
if the duration is long enough, the dead zone counter exceeds a set threshold value, the dead zone is jumped out, and the control quantity is calculated according to the proportional term of the control, the integral term of the control and the differential term of the control at the time.
Alternatively, since the calculation integral term is not obtained by long-term integration at this time, but is reversely calculated by the value of the total control amount at the dead zone, the continuity of the value of the total control amount after the dead zone is jumped out can be ensured, and jump of the control amount does not occur; through the judgment of the 'dead zone in' and the 'dead zone out', the fluctuation of the air pressure in a set range can be tolerated, frequent repeated adjustment is avoided, and the control quantity can be maintained as stable as possible.
S5, calculating the total control quantity and converting the calculated total control quantity into flow;
the flow rate is the product of the flow rate conversion coefficient and the control amount.
S6, limiting the flow, and controlling the flow to a required value.
Limiting the flow, controlling the flow to a required value, and comprising the following steps:
If the flow is not higher than the surge flow, let flow = surge flow + safety margin,
Alternatively, the desired flow rate may be obtained by measuring the intake flow rate of the air compressor in real time, and controlling the rotation speed by PID (process controller). By the control method, the air pressure and the flow are collected and controlled and calculated, so that the control method can adapt to long-time lag of compressed air, avoid frequent adjustment and avoid surging caused by the fact that the flow of the air compressor is lower than the surging flow.
In an alternative embodiment, for a centrifugal air compressor, the given air pressure is 0.70MPa, the allowable air pressure range: the range of entering the dead zone is +/-0.02 MPa, and the range of jumping out of the dead zone is +/-0.025 MPa. The count threshold for the in and out dead zone is 50. Examples of control over a period of time are as follows:
at the beginning, the actual air pressure was very close to the given value of 0.70MPa, which was measured to be about 0.705MPa.
After the calculation is performed in the mode, the control error in the period is kept low all the time, and after 51 times of counting, the dead zone forbidden counter exceeds a set threshold value, and at the moment, the dead zone is entered. After entering the dead zone, stopping the operation of the set value of the air compressor, so that the air compressor continuously rotates at the current rotating speed and flow. I.e. the total control quantity value of the control quantity is kept constant. The integral term is calculated differently when in the dead zone, and the term should be calculated in the opposite direction.
After converting the control amount into the force, for example, the maximum amplitude of the control amount corresponds to the maximum allowable flow rate 20000 cubic meters per hour of the air compressor, and when the maximum amplitude is 80%, the corresponding command flow rate is 16000 cubic meters per hour. Since the control amount is maintained constant, the flow rate of the air compressor is maintained constant, and repetitive control and periodic fluctuation of the control amount are avoided. After a period of time has elapsed, the air pressure gradually deviates from a given value due to the change of the usage, for example, reaches 0.728MPa, the absolute value of the error exceeds the allowable dead zone output range, at this time, the dead zone output counter is accumulated, and the dead zone input counter is cleared.
After the duration time is long enough, after 51 times of counting, the dead zone counter exceeds a set threshold value, the dead zone is jumped out, the control quantity is calculated according to the proportional term of control, the integral term of control and the differential term of control at the moment, but the term is not obtained through long-term integration at the moment, and the reverse calculation is carried out on the dead zone, so that the continuity of the value after the dead zone is jumped out can be ensured, and the jump of the control quantity does not occur. For example, the flow rate corresponding to the control amount in the dead zone is 16000 cubic meters/hour, and the control can be continuously performed from the vicinity of 16000 cubic meters/hour at the moment of jumping out of the dead zone, and the control is only slightly affected by the proportional term and the differential term of the control at that time, without occurrence of a large jump.
At any moment, the calculated command flow is limited, and the allowable flow is not lower than the surge flow: for example, by looking up the performance curve of the air compressor, the surge flow rate at the air pressure of 0.728MPa is 14000 cubic meters per hour, and the command flow rate calculated at a certain moment does not exceed the surge flow rate, the command flow rate is modified: flow = 14000+300 = 14300, surge flow + safety margin, where 300 is the specified safety margin. Through the mode, the generated instruction flow is always higher than the safety flow, so that the air compressor always operates outside the surge area, and the surge caused by insufficient flow is avoided. After the instruction flow is obtained, a PID control mode is adopted, the rotation speed control of the air compressor is carried out through the comparison of the measured actual flow and the instruction flow, and a rotation speed instruction is output to the speed regulator. The speed regulator used in the embodiment is a frequency converter, and the system outputs a rotating speed instruction, and the output form is 4-20 mA current instruction, so that the frequency converter can regulate the air compressor in real time according to the rotating speed instruction given by the system.
The implementation principle of the embodiment of the application is as follows: the speed regulator is used for controlling the rotational speed of air compressor machine main shaft, and then the compressibility of air compressor machine has been controlled, output compressed air's pressure promptly, reach the effect of change flow, the flowmeter is used for taking notes the air compressor machine and gets into the flow condition of air, and in this partial data transmission to control system, make things convenient for control system to monitor the flow in the air compressor machine, when the inside flow of air compressor machine needs to be changed, send the command to the speed regulator through control system, and then change the rotational speed of air compressor machine, thereby reach the effect of changing the air compressor machine flow in real time, pressure sensor transmits the numerical value of the air pressure of output towards control system in real time, control system judges according to the information, send the rotational speed command to the speed regulator according to the demand, make the speed regulator control air compressor machine main shaft rotational speed, and then control output flow.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A system for controlling an air compressor, comprising: the device comprises an air compressor, a flowmeter, a speed regulator, an air storage tank, an air compressor output valve, an output pipeline and a system output valve, wherein the flowmeter is communicated with the air compressor;
The speed regulator can change the flow of the air compressor after regulating the rotating speed of the main shaft of the air compressor, and the air compressor further comprises a control system, wherein a pressure sensor is further arranged between the system output valve and the air storage tank, and the pressure sensor, the flowmeter and the control system are connected.
2. The system for controlling an air compressor of claim 1, wherein: the air compressor is communicated with an air inlet, the air inlet is used for sucking air, the air enters the air compressor from the air inlet, the air compressor output valve is opened when the air compressor operates, the air compressor output valve is communicated with compressed air, and the compressed air enters the air storage tank for buffering and is output through the system output valve;
The flow meter transmits the transmission air inlet flow to the control system, the pressure sensor transmits the compressed air pressure value to the control system, and the control system determines whether to send a rotating speed instruction to the speed regulator according to the information transmitted by the flow meter and the pressure sensor, namely, controls the air compressor.
3. A method of controlling an air compressor, characterized by:
The air compressor is controlled by a system for controlling the air compressor, wherein the system for controlling the air compressor comprises a flowmeter, the air compressor, a speed regulator, a pressure sensor and a control system, and the method for controlling the air compressor is realized based on the control system; the control system has a separate control method comprising:
calculating the control error at intervals;
Calculating a proportional term, a differential term and an integral term of the control;
Calculating the total control value and performing amplitude limiting;
Calculating the absolute value of the error, and judging and operating the control dead zone according to the absolute value of the error;
the total control quantity is converted into flow after being calculated;
And limiting the flow, and controlling the flow to a required value.
4. A method and system for controlling an air compressor as set forth in claim 3, wherein: the absolute value of the error is calculated, and the judgment and operation of the control dead zone are carried out according to the absolute value of the error, comprising the following steps:
If the absolute value of the control error is smaller than or equal to the set threshold value, the dead zone entering counter is subjected to accumulation operation, and the dead zone exiting counter is subjected to zero clearing:
if the duration is long enough, the dead zone counter is entered at this time to exceed the set threshold value, and the dead zone is entered.
5. The method and system for controlling an air compressor of claim 4, wherein:
when the dead zone is present, the calculation method of the integral term of the calculation control is different, and the integral term of the calculation control is reversed at this time:
In the dead zone state, the integral term of the control is the value of the control quantity minus the proportional term of the control, and the differential term of the control.
6. The method and system for controlling an air compressor of claim 4, wherein:
If the absolute value of the error is larger than the set threshold value, accumulating the dead zone counter, and resetting the dead zone counter;
if the duration is long enough, the dead zone counter exceeds a set threshold value, the dead zone is jumped out, and the control quantity is calculated according to the proportional term of the control, the integral term of the control and the differential term of the control at the time.
7. A method and system for controlling an air compressor as set forth in claim 3, wherein: the flow is limited, and the flow is controlled to a required value, comprising the following steps:
if the flow is not higher than the surge flow, the flow=surge flow+safety margin.
8. The method and system for controlling an air compressor of claim 7, wherein: the air inlet flow of the air compressor is measured in real time, and the rotating speed is controlled through PID (process controller) to obtain the expected flow.
9. A method and system for controlling an air compressor as set forth in claim 3, wherein: the control error is calculated once at intervals, and the method comprises the following steps:
when calculating the control error value, the control error=given air pressure-actual air pressure.
10. The method and system for controlling an air compressor of claim 1, wherein: the calculation control proportion term, the differentiation term and the integration term specifically comprise the following steps:
Calculating a proportional term, wherein the proportional term is controlled by the product of the proportional coefficient and the control error value;
calculating a differential term, wherein the differential term of control is the product of a differential coefficient and a control error value;
And calculating an integral term, wherein the controlled integral term is the sum of the controlled integral term and the controlled proportional term.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129123.9A CN117927494A (en) | 2024-01-30 | 2024-01-30 | Method and system for controlling air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129123.9A CN117927494A (en) | 2024-01-30 | 2024-01-30 | Method and system for controlling air compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117927494A true CN117927494A (en) | 2024-04-26 |
Family
ID=90757408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410129123.9A Pending CN117927494A (en) | 2024-01-30 | 2024-01-30 | Method and system for controlling air compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117927494A (en) |
-
2024
- 2024-01-30 CN CN202410129123.9A patent/CN117927494A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2112891C (en) | Compressed air control system | |
| US5496388A (en) | System for compressing air and extracting nitrogen from compressed air | |
| EP1017950B1 (en) | Diagnostic device and method for pressure regulator | |
| EP0686774B1 (en) | Turbomachinery with variable angle fluid guiding devices | |
| CA2668314C (en) | Intelligent pressure regulator | |
| CN100476172C (en) | Compressor control unit and gas turbine power plant including the same | |
| US7712299B2 (en) | Anti-bogdown control system for turbine/compressor systems | |
| CN102863074A (en) | Intelligent control method of blast aeration system of municipal sewage plant | |
| US20080264086A1 (en) | Method for improving efficiency in heating and cooling systems | |
| CN101554995A (en) | Energy-saving air separation oxygenerator | |
| CN102434781A (en) | Temperature-reducing and pressure-reducing system | |
| US20030161731A1 (en) | Process for controlling a plurality of turbo engines in parallel or tandem operation | |
| CN117927494A (en) | Method and system for controlling air compressor | |
| CN108425876A (en) | A kind of butterfly valve apparatus and its control method suitable for pump pipeline system | |
| CN107035970B (en) | Control device and control method for stabilizing pneumatic branch pipe network pressure | |
| US9670847B2 (en) | Two-shaft gas turbine | |
| US6599094B2 (en) | Screw compressor system and operating method thereof | |
| CN111075749B (en) | Intelligent anti-surge device of ultrahigh-speed centrifugal fan | |
| JP4913079B2 (en) | Turbine control valve control device | |
| JPH11117894A (en) | Gas compression facility and its operating method | |
| CN116181679B (en) | Compressor surge control system | |
| Drees et al. | Wood-Boring Insects of Trees and Shrubs. | |
| CN216407212U (en) | Anti-surge device | |
| JP2001082380A (en) | Method and device for controlling volume of gas force feeding device | |
| JP7309685B2 (en) | compressor unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |