CN114279257A - Intelligent control method of power frequency and variable frequency combined air cooler - Google Patents
Intelligent control method of power frequency and variable frequency combined air cooler Download PDFInfo
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Abstract
The invention provides an intelligent control method of a power frequency and frequency conversion combined air cooler. The method comprises the following steps: if T is more than T1, starting the No. 1 variable frequency fan and controlling the No. 1 variable frequency fan by the temperature control PID; delaying, if T is larger than T1 and the rotating speed of the No. 1 variable frequency fan reaches full speed, starting the No. 1 power frequency fan; … …, respectively; delaying, if T is larger than T1 and the rotating speed of the N-1 variable frequency fan reaches full speed, starting the N variable frequency fan, and controlling the N variable frequency fan by a temperature control PID; and delaying, if T is greater than T1 and the rotating speed of the N variable frequency fan reaches full speed, starting the N power frequency fan, and controlling the N variable frequency fan by the temperature control PID. The beneficial effects of the invention can include: the temperature of the medium after cooling can be controlled in a full-automatic and accurate manner; the frequency conversion air cooler and the power frequency air cooler are used in a balanced mode, and equipment maintenance and repair management are facilitated.
Description
Technical Field
The invention relates to the field of air coolers, in particular to an intelligent control method of a power frequency and frequency conversion combined type air cooler.
Background
At present, a gas compression station is generally designed for domestic long-distance natural gas pipelines to carry out pressurization, the temperature of natural gas pressurized by a compressor rises sharply, and the pressurized natural gas needs to be cooled for ensuring the natural gas conveying efficiency and the operation safety. At present, more air compression stations use air coolers, and an axial flow fan is driven by a motor to cool finned tubes of the air cooler, so that natural gas is cooled.
The invention aims at a frequency conversion and power frequency combined air cooler which is generally composed of 2N (6 or 8 are common) fans, wherein half (N) fans are power frequency fans, and half (N) fans are frequency conversion fans, the start and stop of the air cooler are controlled by PID (proportion integration differentiation) by a cooled temperature transmitter TT (a set value T1 of TT is recorded), and the real-time temperature of TT is recorded as T ℃.
The current control methods of the power frequency and frequency conversion combined air cooler generally have three types:
automatically starting N power frequency fans, delaying for M seconds, keeping the current situation if the temperature T meets the requirement (T is less than or equal to T1) after the medium is cooled, and gradually starting 1 variable frequency fan according to the PID output of the temperature change TT if the temperature T still can not meet the requirement (T > T1) after the medium is cooled. And after delaying for M seconds, if T is more than T1, continuing to start 1 variable frequency fan according to the PID output of the temperature change TT until T is close to T1.
And secondly, automatically starting N power frequency fans, and keeping the current situation if T is less than or equal to T1 after delaying for M seconds. And if T > T1, starting the N variable frequency fans completely, and adjusting the rotating speed of the N variable frequency fans according to the PID output of the temperature change TT until T is close to T1.
And thirdly, manually starting X power frequency fans (X is less than or equal to N), after delaying for M seconds, manually judging whether the temperature meets the requirement (T is less than or equal to T1) after the medium is cooled, if the temperature meets the requirement, keeping the current situation, and if the temperature does not meet the requirement (T is more than T1), manually starting the variable frequency fans, and gradually starting the single variable frequency fan according to PID control until T is close to T1.
The first method and the second method have the defects that after N power frequency fans are started under partial working conditions (low flow, low pressurization and the like) and climatic conditions (particularly in winter), the temperature T after medium cooling is probably far less than a set value T1, energy waste is caused at the moment, and a large energy-saving space exists. Meanwhile, the use frequency of the power frequency fan is far greater than that of the variable frequency fan, and the equipment is unbalanced in use.
The third method has the defects that the method is semi-automatic control, needs manual judgment, selection and intervention, and does not meet the requirement of full-automatic control.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, the energy can not be wasted under partial working conditions (low flow, low pressurization and the like) and climatic conditions (particularly in winter), and the equipment can be used in a balanced manner. For another example, the intelligent control method of the power frequency and frequency conversion combined air cooler can be provided, which does not need manual work, meets the full-automatic control requirement, can rapidly cool natural gas, and can save energy to the maximum extent.
In order to achieve the purpose, the invention provides an intelligent control method of an industrial frequency and variable frequency combined air cooler. The power frequency and frequency conversion combined type air cooler comprises N power frequency fans and N frequency conversion fans, wherein N is a natural number and is not less than 2, and the method comprises the following steps: s11: setting a natural number i not more than N-1, wherein the initial value of i is 1; s12: delaying for M seconds; s13: acquiring a real-time temperature T and a set temperature T1, if T is greater than T1, controlling the operation of the ith variable frequency fan by using a temperature control PID, and if T is less than or equal to T1, returning to the step S12; s14: delaying for M seconds; s15: acquiring a real-time temperature T, a set temperature T1 and an ith variable frequency fan rotating speed, starting an ith power frequency fan if T is more than T1 and the ith variable frequency fan rotating speed reaches full speed, and returning to the step S14 if T is less than or equal to T1; s21: delaying for M seconds; s22: acquiring a real-time temperature T, a set temperature T1 and an ith variable frequency fan rotating speed, if T is greater than T1, turning to the step S221, and if T is less than or equal to T1, turning to the step S222; s221: switching a temperature control PID to control the (i + 1) th variable frequency fan and enabling the (i) th variable frequency fan to run at full speed; s222: closing the ith power frequency fan, controlling the ith variable frequency fan by the temperature control PID, and returning to the step S14; s31: delaying for M seconds; s32: acquiring a real-time temperature T, a set temperature T1 and an i +1 th variable frequency fan rotating speed, if T is greater than T1 and the i +1 th variable frequency fan rotating speed reaches full speed, starting the i +1 th power frequency fan, if T is less than or equal to T1 and the i +1 th variable frequency fan rotating speed is 0, switching a temperature control PID to control the i +1 th variable frequency fan and close the i +1 th variable frequency fan, returning to the step S21, and if T is less than or equal to T1 and the i +1 th variable frequency fan rotating speed is not 0, still controlling the i +1 th variable frequency fan by the temperature control PID, and returning to the step S31; s41: delaying for M seconds; s42: the method comprises the steps of obtaining a real-time temperature T, a set temperature T1 and an i +1 th variable frequency fan rotating speed, if T is larger than T1 and the i +1 th variable frequency fan rotating speed reaches full speed, judging whether i +1 is equal to N or not, returning to the step S41 if i +1 is equal to N, giving the value of i +1 to i if i +1 is not equal to N, returning to the step S221, if T is smaller than or equal to T1, closing the i +1 th power frequency fan, and returning to the step S31.
In an exemplary embodiment of the invention, said N is 3, 4, 5 or 6.
In an exemplary embodiment of the invention, M is 100-140.
In an exemplary embodiment of the invention, the set temperature T1 ≦ 50 deg.C.
In an exemplary embodiment of the invention, the set temperature T1 is 20-40 ℃.
In an exemplary embodiment of the invention, the real-time temperature t is obtained by a temperature transmitter.
Yet another aspect of the present invention provides a machine-readable storage medium storing one or more computer instructions which, when executed by a processor, cause the combined line-frequency and variable-frequency air cooler to perform the above-mentioned intelligent control method.
In an exemplary embodiment of the present invention, a machine-readable storage medium stores a computer program or computer instructions, and when the computer program or the computer instructions are executed, the intelligent control method of the combined industrial frequency and variable frequency air cooler of the present invention can be implemented. The computer readable storage medium may be any data storage device that stores data that can be read by a computer system. For example, examples of computer-readable storage media may include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
In another aspect, the present invention provides an electronic device, including a memory and a processor, where the memory is used to store one or more computer instructions, and the one or more computer instructions, when executed by the processor, implement the above-mentioned intelligent control method for a combined industrial-frequency and variable-frequency air cooler.
In an exemplary embodiment of the present invention, the intelligent control method of the combined industrial frequency and variable frequency air cooler of the present invention can be compiled into corresponding program codes or instructions and programmed into a computer program. When the program codes or the instructions are executed by the processor, the steps S11 to S42 in the intelligent control method of the power frequency and variable frequency combined air cooler can be realized, so that the intelligent control of the power frequency and variable frequency combined air cooler can be realized.
Compared with the prior art, the beneficial effects of the invention can include:
(1) the natural gas can be rapidly cooled, and meanwhile, energy can be saved to the maximum extent;
(2) the power frequency fan and the frequency conversion fan can be used in a balanced manner, and equipment maintenance and repair management is facilitated.
Drawings
Fig. 1 shows a schematic diagram of the combined industrial frequency and variable frequency air cooler in an exemplary embodiment of the invention.
The labels in the figure are:
1-inlet pipeline, 2-air cooler, 3-outlet pipeline, 4-temperature transmitter, 5-variable frequency fan, 51-1 st variable frequency fan, 52-2 nd variable frequency fan, 53-3 rd variable frequency fan, 54-4 th variable frequency fan, 6-power frequency fan, 61-1 st power frequency fan, 62-2 nd power frequency fan, 63-3 rd power frequency fan, 64-4 th power frequency fan and 7-controller.
Detailed Description
Hereinafter, the intelligent control method of the combined industrial frequency and variable frequency air cooler of the invention will be described in detail with reference to the exemplary embodiments.
Example 1
In an exemplary embodiment of the invention, the power frequency and variable frequency combined air cooler comprises N power frequency fans and N variable frequency fans, wherein N is a natural number and is greater than or equal to 2.
The intelligent control method of the power frequency and variable frequency combined air cooler comprises the steps of S1, S2, S3 and S4.
Step S1 may include the following sub-steps:
s11: setting the natural number i not more than N-1, and setting the initial value of i as 1.
S12: delaying for M seconds.
S13: acquiring the real-time temperature T and the set temperature T1, judging whether the real-time temperature T is greater than the set temperature T1,
and if T is greater than T1, controlling the ith variable frequency fan to operate by using a temperature control PID, wherein i is equal to 1.
If T ≦ T1, go back to step S12.
S14: delaying for M seconds;
s15: the real-time temperature T and the set temperature T1 are acquired,
if T is more than T1 and the rotating speed of the ith variable frequency fan reaches full speed, starting the ith power frequency fan, and controlling the ith variable frequency fan by the temperature control PID, wherein the rotating speed of the ith variable frequency fan inevitably reaches full speed when the real-time temperature T is more than the set temperature T1 because the ith variable frequency fan is controlled by the temperature control PID;
if T ≦ T1, go back to step S14.
Step S2 may include the following sub-steps:
s21: delaying for M seconds.
S22: and acquiring the real-time temperature T, the set temperature T1 and the ith variable frequency fan rotating speed.
If T is greater than T1, turning to step S221, wherein the rotation speed of the ith variable frequency fan is inevitably full speed if T is greater than T1 because the ith variable frequency fan is controlled by the temperature control PID;
if T is less than or equal to T1, go to step S222.
S221: and switching the temperature control PID to control the (i + 1) th variable frequency fan and enabling the (i) th variable frequency fan to run at full speed.
S222: and (5) closing the ith power frequency fan, controlling the ith variable frequency fan by the temperature control PID, and returning to the step S14.
Step S3 may include the following sub-steps:
s31: delaying for M seconds.
S32: obtaining real-time temperature T, set temperature T1 and the (i + 1) th variable frequency fan rotating speed,
if T is more than T1, and the rotation speed of the (i + 1) th variable frequency fan reaches full speed, the (i + 1) th power frequency fan is started, at the moment, the temperature control PID still controls the (i + 1) th variable frequency fan,
if T is less than or equal to T1 and the rotating speed of the (i + 1) th variable frequency fan is 0, switching the temperature control PID to control the (i) th variable frequency fan and closing the (i + 1) th variable frequency fan, and returning to the step S21. When T is less than or equal to T1, the temperature of the cooled medium is proved to be effectively controlled, and at the moment, in order to save energy, the (i + 1) th variable frequency fan with the rotating speed of 0 is turned off, and the (i) th variable frequency fan is controlled by using the temperature control PID.
If T is less than or equal to T1 and the rotating speed of the (i + 1) th variable frequency fan is not 0, the temperature control PID still controls the (i + 1) th variable frequency fan, and the step S31 is returned.
Step S4 may include the following sub-steps:
s41: delaying for M seconds.
S42: obtaining real-time temperature T, set temperature T1 and the (i + 1) th variable frequency fan rotating speed,
if T is more than T1 and the rotating speed of the (i + 1) th variable frequency fan reaches full speed, judging whether i +1 is equal to N or not,
if i +1 is equal to N, the process returns to step S41,
if i +1 ≠ N, assigning the value of i +1 to i, returning to step S221,
if T is less than or equal to T1, the (i + 1) th power frequency fan is closed, the temperature control PID still controls the (i + 1) th variable frequency fan, and the step S31 is returned.
In one exemplary embodiment of the present invention, N ═ 3 or 4.
In one exemplary embodiment of the invention, M is 100 ~ 140.
In one exemplary embodiment of the present invention, M120.
In an exemplary embodiment of the invention, T1 ≦ 50 ℃, e.g., T1 ═ 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, or 50 ℃.
Example 2
In an exemplary embodiment of the present invention, for example, as shown in fig. 1, the combined industrial frequency and variable frequency air cooler includes 4 variable frequency fans (1 st variable frequency fan 51, 2 nd variable frequency fan 53, 3 rd variable frequency fan 53 and 4 th variable frequency fan 54) and 4 industrial frequency fans (1 st industrial frequency fan 61, 2 nd industrial frequency fan 62, 3 rd industrial frequency fan 63 and 4 th industrial frequency fan 64). Cooled medium enters from the inlet pipeline 1 and enters the finned tubes of the air cooler 2 through the branch pipelines, and after the variable frequency fan 5 and the power frequency fan 6 operate, air flow is generated to cool the fins, so that the cooled medium in the cooling pipeline flows out from the outlet pipeline 3. The outlet pipe 3 is provided with a temperature transmitter 4 for acquiring the real-time temperature t of the temperature of the cooled medium. The temperature transmitter 4 acquires the real-time temperature t of the cooled medium and uploads it to the controller 7.
The controller 7 comprises a temperature control PID, the real-time temperature t is a control parameter of the temperature control PID, the rotating speed of the variable frequency fan is a controlled parameter of the temperature control PID, and the real-time rotating speed of the variable frequency fan is r. The controller 7 can set a set temperature T1, can obtain the real-time temperature T of a cooled medium, can obtain the real-time rotating speed r of the variable-frequency fan controlled by the temperature control PID, and can also output a control signal to start or stop the fan.
And when the real-time temperature T is greater than the set temperature T1 of the controller, the controller starts the fan or increases the rotating speed of the variable frequency fan and the like according to the intelligent control method. And when the real-time temperature T is less than the temperature T1 set by the controller, the controller stops the fan or reduces the rotating speed of the variable frequency fan according to the intelligent control method. The controller 7 is a programmable logic controller. For example, the cooled medium enters from the inlet pipe 1, passes through the air cooler 2, and flows out from the outlet pipe 3, and the intelligent control method can be performed by adopting the following steps:
s11': setting a natural number i not more than N-1, wherein the initial value of i is 1;
s12': delaying for 120 seconds, and waiting for the temperature transmitter 4 to acquire the real-time temperature t of the cooled medium;
s13': acquiring a set temperature T1 and a real-time temperature T of a cooled medium, comparing the real-time temperature T with a set temperature T1, wherein the comparison result is that T is greater than T1, and controlling the 1 st variable frequency fan to operate by using a temperature control PID (proportion integration differentiation) because i is 1;
s14': delaying for 120 seconds, and waiting for the 1 st variable frequency fan to operate;
s15': acquiring a set temperature T1, a real-time temperature T of a cooled medium and a 1 st variable frequency fan rotating speed r1, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is greater than T1, judging whether the 1 st variable frequency fan rotating speed r1 is the full speed of the 1 st variable frequency fan, if the judgment result is that the full speed is reached, starting the 1 st power frequency fan, and at the moment, controlling the 1 st variable frequency fan to run by a control PID;
s21': delaying for 120 seconds, and waiting for the 1 st power frequency fan and the 1 st variable frequency fan to operate;
s22': acquiring a real-time temperature T, a set temperature T1 and an ith variable frequency fan rotating speed r1, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is larger than T1, judging whether the 1 st variable frequency fan rotating speed r1 is the full speed of the 1 st variable frequency fan, and if the judgment result is that the full speed is reached, turning to the step S221;
s221': switching the temperature control PID to control the 2 nd (i is 1 and i +1 is 2) variable frequency fan, and enabling the 1 st (i is 1) variable frequency fan to run at full speed;
s31': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st variable frequency fan and the 2 nd variable frequency fan to operate;
s32': acquiring a real-time temperature T, a set temperature T1 and a 2 nd (at this time, i is 1, i +1 is 2) variable frequency fan rotating speed r2, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is greater than T1, judging whether the 2 nd variable frequency fan rotating speed r2 is the full speed of the 2 nd variable frequency fan, if the judgment result is that the full speed is reached, starting the 2 nd power frequency fan, and at this time, the 2 nd variable frequency fan is still controlled by a control PID to operate;
s41': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st frequency conversion fan, the 2 nd power frequency fan and the 2 nd frequency conversion fan to operate;
s42': acquiring a real-time temperature T, a set temperature T1 and a 2 nd (at this time, i is 1, i +1 is 2) variable frequency fan rotation speed, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is greater than T1, determining whether the 2 nd variable frequency fan rotation speed r2 is the full speed of the 2 nd variable frequency fan, if the determination result is that the full speed is reached, determining whether i +1 is equal to N, at this time, i is 1, i +1 is 2, N is 4, i +1 is not equal to 4, assigning a value of i +1 to i, at this time, i is 2, and returning to step S221;
s221': switching the temperature control PID to control the 3 rd (i is 2 at this time, i +1 is 3 at this time) variable frequency fan and enabling the 2 nd (i is 2 at this time) variable frequency fan to run at full speed;
s31': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st frequency conversion fan, the 2 nd power frequency fan, the 2 nd frequency conversion fan and the 3 rd frequency conversion fan to operate;
s32': acquiring a real-time temperature T, a set temperature T1 and a 3 rd (at this time, i is 2, i +1 is 3) variable frequency fan rotating speed r3, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is greater than T1, judging whether the 3 rd variable frequency fan rotating speed r3 is the full speed of the 3 rd variable frequency fan, if the judgment result is that the full speed is reached, starting the 3 rd power frequency fan, and at this time, the 3 rd variable frequency fan is still controlled by a control PID to operate;
s41': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st frequency conversion fan, the 2 nd power frequency fan, the 2 nd frequency conversion fan, the 3 rd power frequency fan and the 3 rd frequency conversion fan to operate;
s42': acquiring a real-time temperature T, a set temperature T1 and a 3 rd (at this time, i is 2, i +1 is 3) variable frequency fan rotation speed, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T > T1, determining whether the 3 rd variable frequency fan rotation speed r3 is the full speed of the 3 rd variable frequency fan, if the determination result is that the full speed is reached, determining whether i +1 is equal to N, at this time, i is 2, i +1 is 3, N is 4, i +1 is not equal to 4, assigning a value of i +1 to i, at this time, i is 3, and returning to step S221;
s221': switching the temperature control PID to control a 4 th (i is 3, i +1 is 4) variable frequency fan and enabling the 3 rd (i is 3) variable frequency fan to run at full speed;
s31': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st frequency conversion fan, the 2 nd power frequency fan, the 2 nd frequency conversion fan, the 3 rd frequency conversion fan and the 4 th frequency conversion fan to operate;
s32': acquiring a real-time temperature T, a set temperature T1 and a 4 th (at this time, i is 3, i +1 is 4) variable frequency fan rotating speed r4, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T is greater than T1, judging whether the 4 th variable frequency fan rotating speed r4 is the full speed of the 4 th variable frequency fan, if the judgment result is that the full speed is reached, starting the 4 th power frequency fan, and at this time, the 4 th variable frequency fan is still controlled by a control PID to operate;
s41': delaying for 120 seconds, and waiting for the 1 st power frequency fan, the 1 st frequency conversion fan, the 2 nd power frequency fan, the 2 nd frequency conversion fan, the 3 rd power frequency fan, the 3 rd frequency conversion fan, the 4 th power frequency fan and the 4 th frequency conversion fan to operate;
s42': acquiring a real-time temperature T, a set temperature T1 and a 4 th (at this time, i is 3, i +1 is 4) variable frequency fan rotation speed, comparing the real-time temperature T with the set temperature T1, if the comparison result is that T > T1, determining whether the 4 th variable frequency fan rotation speed r3 is the full speed of the 4 th variable frequency fan, determining whether i +1 is equal to N, at this time, i is 3, i +1 is 4, N is 4, i +1 is 4, and then going to step S41.
Example 3
In addition to the embodiment 2, if the comparison result between the real-time temperature T and the set temperature T1 in step S22 'is T ≦ T1, the process goes to step S222': and (4) closing the 1 st (at this time, i is equal to 1) power frequency fan, controlling the 1 st (at this time, i is equal to 1) variable frequency fan by the temperature control PID, and returning to the step S14'.
In addition to embodiment 2, if the comparison result between the real-time temperature T and the set temperature T1 in step S42 'is T ≦ T1, the 2 nd (in this case, i is 1, i +1 is 2) commercial frequency fan is turned off, and the process returns to step S31'.
Example 4
In an exemplary embodiment of the present invention, when N ≧ 2, the method may be the steps of:
judging whether the real-time temperature T is greater than a set temperature T1, if T is greater than T1, starting the No. 1 variable frequency fan and controlling the No. 1 variable frequency fan by a temperature control PID;
delaying, judging whether the real-time temperature T is greater than a set temperature T1, if T is less than or equal to T1, not continuing to start other fans, if T is greater than T1 and the rotating speed of the No. 1 variable-frequency fan reaches full speed, starting the No. 1 power-frequency fan, and controlling the No. 1 variable-frequency fan by a temperature control PID;
delaying, judging whether the real-time temperature T is greater than a set temperature T1, if T is less than or equal to T1, not continuing to start other fans, if T is greater than T1 and the rotating speed of the N-1 variable-frequency fan reaches full speed, starting the N variable-frequency fan, and controlling the N variable-frequency fan by a temperature control PID;
and delaying, judging whether the real-time temperature T is greater than a set temperature T1, if T is less than or equal to T1, not continuing to start other fans, and if T is greater than T1 and the rotating speed of the N variable-frequency fan reaches full speed, starting the N power-frequency fan, and controlling the N variable-frequency fan by a temperature control PID.
Example 5
In an exemplary embodiment of the invention, the intelligent control method of the power frequency and frequency conversion combined air cooler comprises a start control method of the frequency conversion and power frequency combined air cooler and a stop control method of the frequency conversion and power frequency combined air cooler.
The starting control method comprises the following steps:
(1) and starting the 1 st variable frequency fan, and regulating the speed of the 1 st variable frequency fan according to the temperature control PID output.
(2) After the 1 st variable frequency fan is started, delaying for M seconds to obtain a real-time temperature T and a set temperature T1, if T is more than T1 and the 1 st variable frequency fan reaches full speed, starting the 1 st power frequency fan, and controlling the 1 st variable frequency fan by a temperature control PID; if T is less than or equal to T1, the other fans are not started any more, and the 1 st variable frequency fan is controlled by the temperature control PID.
(3) After the 1 st power frequency fan is started, delaying for M seconds to obtain a real-time temperature T and a set temperature T1, if T is more than T1 and the 1 st variable frequency fan reaches full speed, starting the 2 nd variable frequency fan, and controlling the 2 nd variable frequency fan by a temperature control PID; if T is less than or equal to T1, the other fans are not started any more, and the 1 st variable frequency fan is controlled by the temperature control PID.
(4) After the 2 nd variable frequency fan is started, delaying for M seconds: if T is more than T1 and the 2 nd variable frequency fan reaches full speed, starting the 2 nd power frequency fan, and controlling the 2 nd variable frequency fan by the temperature control PID; if T is less than or equal to T1, other air coolers are not started any more, and the 2 nd variable frequency fan is controlled by the temperature control PID.
(5) After the N-1 power frequency fan is started, delaying for M seconds: if T is more than T1 and the rotating speed of the N-1 frequency conversion fan reaches full speed, starting the N frequency conversion fan, and controlling the N frequency conversion fan by the temperature control PID; if T is less than or equal to T1, the other fans are not started any more, and the temperature control PID controls the N-1 frequency conversion fan.
(6) After the Nth variable frequency fan is started, delaying for M seconds: if T is more than T1 and the rotating speed of the Nth variable frequency fan reaches full speed, starting the 2 nd power frequency fan, and controlling the Nth variable frequency fan by the temperature control PID; if T is less than or equal to T1, other fans are not started any more, and the temperature control PID controls the Nth variable frequency fan.
(7) The above steps are repeated until the temperature T and the set point T1 are close.
In the whole process, in order to realize the purposes of saving energy to the maximum extent, realizing full automation, and accurately controlling the temperature of the cooled medium, and the balanced use of the variable frequency fan and the power frequency fan, only the last variable frequency fan in operation is controlled by the temperature control PID, the speed is adjustable, and the other variable frequency fans in operation are kept in full-speed operation. The method can simultaneously give consideration to maximum energy conservation and accurate control of the temperature of the medium after cooling, can be applied to the fields of long-distance pipelines, oil refining, chemical engineering and the like, has wide application prospect, and is beneficial to maintenance and repair management of equipment.
After the operation for a period of time, when the temperature of the medium passing through the air cooler gradually decreases, T is less than T1, and finally, the rotating speed of the variable frequency fan (assumed as the A-th variable frequency fan) controlled by the temperature control PID gradually decreases (assumed that the highest serial number of the power frequency fan is the B-th power frequency fan at the moment), wherein the stop control method comprises the following steps:
(1) when the rotating speed of the A-th variable frequency fan is reduced to 0: if A is less than or equal to B, stopping the B-th power frequency fan; and if A is larger than B, stopping the A-th variable frequency fan.
(2) And if the B-th power frequency fan is stopped, enabling B to be B-1, namely giving the value of B-1 to B, and still controlling the A-th variable frequency fan by using the temperature control PID.
(3) And if the A-th variable-frequency fan is stopped, enabling the A to be equal to A-1, namely, giving the A-1 value to the A, and controlling the A-1-th variable-frequency fan by using a temperature control PID.
(4) The previous steps are repeated until the temperature T and the set point T1 are close.
In the whole process, the stopping process and the starting process of the fan are opposite. In the whole process, only the last frequency conversion fan in operation is controlled by the temperature control PID, the speed is adjustable, the frequency conversion fans in other operations are kept in full-speed operation, the intelligent operation control device is suitable for intelligent operation control of various power frequency and frequency conversion combined air coolers, and the frequency conversion fans and the power frequency fans can be used in a balanced mode.
In summary, the beneficial effects of the invention can include:
(1) the intelligent operation control system is suitable for intelligent operation control of various power frequency and variable frequency combined air coolers;
(2) the variable frequency air cooler and the power frequency air cooler are used in a balanced manner, so that the maintenance and management of equipment are facilitated;
(3) the temperature of the medium after cooling can be controlled in a full-automatic and accurate manner.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. An intelligent control method of a power frequency and frequency conversion combined type air cooler is characterized in that the power frequency and frequency conversion combined type air cooler comprises N power frequency fans and N frequency conversion fans, N is a natural number and is not less than 2, and the method comprises the following steps:
s11: setting a natural number i not more than N-1, wherein the initial value of i is 1;
s12: delaying for M seconds;
s13: the real-time temperature T and the set temperature T1 are acquired,
if T is more than T1, the temperature control PID is used to control the ith variable frequency fan to operate,
if T is less than or equal to T1, go back to step S12;
s14: delaying for M seconds;
s15: obtaining real-time temperature T, set temperature T1 and ith variable frequency fan rotating speed,
if T is more than T1 and the rotation speed of the ith variable frequency fan reaches full speed, the ith industrial frequency fan is started,
if T is less than or equal to T1, go back to step S14;
s21: delaying for M seconds;
s22: acquiring a real-time temperature T, a set temperature T1 and an ith variable frequency fan rotating speed, if T is greater than T1, turning to the step S221, and if T is less than or equal to T1, turning to the step S222;
s221: switching a temperature control PID to control the (i + 1) th variable frequency fan and enabling the (i) th variable frequency fan to run at full speed;
s222: closing the ith power frequency fan, controlling the ith variable frequency fan by the temperature control PID, and returning to the step S14;
s31: delaying for M seconds;
s32: obtaining real-time temperature T, set temperature T1 and the (i + 1) th variable frequency fan rotating speed,
if T is more than T1 and the rotating speed of the (i + 1) th variable frequency fan reaches full speed, the (i + 1) th industrial frequency fan is started,
if T is less than or equal to T1 and the rotating speed of the (i + 1) th variable frequency fan is 0, switching the temperature control PID to control the (i) th variable frequency fan and close the (i + 1) th variable frequency fan, returning to the step S21,
if T is less than or equal to T1 and the rotating speed of the (i + 1) th variable frequency fan is not 0, the temperature control PID still controls the (i + 1) th variable frequency fan and returns to the step S31;
s41: delaying for M seconds;
s42: obtaining real-time temperature T, set temperature T1 and the (i + 1) th variable frequency fan rotating speed,
if T is greater than T1 and the i +1 th variable frequency fan reaches full speed, determining whether i +1 is equal to N, if i +1 is equal to N, returning to step S41, if i +1 is not equal to N, assigning the value of i +1 to i, returning to step S221,
and if T is less than or equal to T1, closing the i +1 power frequency fan and returning to the step S31.
2. The intelligent control method of the combined industrial frequency and variable frequency air cooler as claimed in claim 1, wherein the method comprises the following steps:
starting the 1 st variable frequency fan, and regulating the speed of the 1 st variable frequency fan according to the temperature control PID output;
delaying for M seconds, if T is more than T1 and the rotating speed of the 1 st variable frequency fan reaches full speed, starting the 1 st power frequency fan, and controlling the 1 st variable frequency fan by a temperature control PID;
delaying for M seconds, if T is larger than T1 and the rotating speed of the 1 st variable frequency fan reaches full speed, starting the 2 nd variable frequency fan, and switching the temperature control PID to control the 2 nd variable frequency fan;
delaying for M seconds, if T is more than T1 and the rotating speed of the 2 nd variable frequency fan reaches full speed, starting the 2 nd power frequency fan, and controlling the 2 nd variable frequency fan by a temperature control PID;
after the N-1 power frequency fan is started, delaying for M seconds: and if T is more than T1 and the rotating speed of the N-1 frequency conversion fan reaches full speed, starting the N frequency conversion fan, and controlling the N frequency conversion fan by the temperature control PID.
3. The intelligent control method of an industrial frequency and frequency conversion combined air cooler according to claim 1, wherein if the last a-th frequency conversion fan controlled by the temperature control PID decreases in speed gradually, and if the highest-numbered one of the operating industrial frequency fans is the B-th industrial frequency fan, the method comprises the following steps:
when the rotating speed of the A-th variable frequency fan is reduced to 0, if A is less than or equal to B, stopping the B-th power frequency fan; if A is greater than B, stopping the A-th variable frequency fan;
when the power frequency fan B stops, enabling B to be B-1, and controlling the frequency-variable fan A by the temperature control PID;
when the A-th variable frequency fan stops, enabling A to be A-1, and controlling the A-1-th variable frequency fan by a temperature control PID;
wherein A, B is a natural number, A-1 is not less than 1, and B-1 is not less than 1.
4. The intelligent control method of an industrial frequency and variable frequency combined air cooler as claimed in claim 1, wherein N is 3, 4, 5 or 6.
5. The intelligent control method of the industrial frequency and variable frequency combined air cooler as claimed in claim 1, wherein M is 100-140.
6. The intelligent control method of the combined industrial frequency and variable frequency air cooler as claimed in claim 1, wherein the set temperature T1 is not more than 50 ℃.
7. The intelligent control method of the power-frequency and variable-frequency combined air cooler as claimed in claim 4, wherein the set temperature T1 is 20-40 ℃.
8. The intelligent control method of an industrial frequency and variable frequency combined air cooler as claimed in claim 1, wherein the real-time temperature t is obtained by a temperature transmitter.
9. A machine-readable storage medium having stored thereon one or more computer instructions which, when executed by a processor, cause the combined line and frequency air cooler to perform the intelligent control method of any of claims 1-8.
10. An electronic device, comprising a memory and a processor, wherein the memory is used for storing one or more computer instructions, and the one or more computer instructions, when executed by the processor, implement the intelligent control method of the combined industrial frequency and variable frequency air cooler according to any one of claims 1 to 8.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6011050A (en) * | 1983-07-01 | 1985-01-21 | Mayekawa Mfg Co Ltd | Speed control device for cooling fan of unit cooler |
| CN202599217U (en) * | 2012-04-26 | 2012-12-12 | 广东汇嵘节能服务有限公司 | Energy-saving control device for fan motor of cooling tower |
| CN106368971A (en) * | 2016-08-18 | 2017-02-01 | 常州博瑞电力自动化设备有限公司 | Automatic control method of cooling capacity of outer cooling unit |
| CN107289811A (en) * | 2017-08-22 | 2017-10-24 | 洛阳隆华传热节能股份有限公司 | The energy-saving automatic control system and method for a kind of vaporation-type cooling/condensing plant |
| US20170347501A1 (en) * | 2016-05-27 | 2017-11-30 | Toshiba International Corporation | Environmental control for medium-voltage drive |
| WO2018076128A1 (en) * | 2016-10-28 | 2018-05-03 | 中国电建集团山东电力建设第一工程有限公司 | Test scheme for automatically switching from variable frequency to power frequency for primary draught fan in large unit |
| CN113672006A (en) * | 2021-08-26 | 2021-11-19 | 江苏方天电力技术有限公司 | Quick dynamic response synchronous phase modifier stepped external cold water temperature control method |
-
2022
- 2022-01-04 CN CN202210002295.0A patent/CN114279257B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6011050A (en) * | 1983-07-01 | 1985-01-21 | Mayekawa Mfg Co Ltd | Speed control device for cooling fan of unit cooler |
| CN202599217U (en) * | 2012-04-26 | 2012-12-12 | 广东汇嵘节能服务有限公司 | Energy-saving control device for fan motor of cooling tower |
| US20170347501A1 (en) * | 2016-05-27 | 2017-11-30 | Toshiba International Corporation | Environmental control for medium-voltage drive |
| CN106368971A (en) * | 2016-08-18 | 2017-02-01 | 常州博瑞电力自动化设备有限公司 | Automatic control method of cooling capacity of outer cooling unit |
| WO2018076128A1 (en) * | 2016-10-28 | 2018-05-03 | 中国电建集团山东电力建设第一工程有限公司 | Test scheme for automatically switching from variable frequency to power frequency for primary draught fan in large unit |
| CN107289811A (en) * | 2017-08-22 | 2017-10-24 | 洛阳隆华传热节能股份有限公司 | The energy-saving automatic control system and method for a kind of vaporation-type cooling/condensing plant |
| CN113672006A (en) * | 2021-08-26 | 2021-11-19 | 江苏方天电力技术有限公司 | Quick dynamic response synchronous phase modifier stepped external cold water temperature control method |
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| CN114279257B (en) | 2023-06-30 |
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