CN116104744A - Air compressor control system and control method - Google Patents
Air compressor control system and control method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
An air compressor control system and a control method, the system comprises: the system comprises pressing equipment, a sensor, a general control functional module and a man-machine interaction device, wherein the pressing equipment comprises n air compressors, the numbers of the n air compressors are 1# and 2# … … n #, the pressing equipment is connected with the general control functional module, and the general control functional module controls the starting and stopping of the pressing equipment; the n air compressors are divided into m+1 groups from high to low according to the priority of the air compressors, wherein the m groups are respectively a 0-level main air compressor unit, a 1-level standby air compressor unit and a … … m-level standby air compressor unit, and m is a natural number. The universal control functional module is used for automatically controlling n air compressors in the pressurizing equipment and is connected with the man-machine interaction device. The invention can be flexibly expanded, when the control system technology is modified, the number of the main start, the standby start and the full air compressor station air compressors can be flexibly changed, and the control program does not need to be changed or redesigned in a large scale, and only the control parameters need to be modified through a man-machine interaction device; greatly saves manpower, material resources and financial resources.
Description
Technical Field
The invention relates to the field of control of compressed gas systems, in particular to a control system and a control method of an air compressor.
Background
In industrial control, a compressed gas system is needed in many application occasions, such as a large-shaft air supplementing system, a busbar micro-positive pressure system, a speed regulator pressure air tank air supplementing system, a wind brake mechanical braking system and the like of a hydroelectric generating set, and a medium-low pressure air system is needed. These systems are all typical compressed gas systems. The compressed gas system is generally designed with a plurality of air compressors as gas pressurizing equipment, when the technology of the air compressor station of the compressed gas system is modified, the number of the main air compressor unit, each stage of standby air compressor unit and the number of the air compressors of the full air compressor station are changed, and a control program must be rewritten or changed in a large scale, so that a great deal of manpower, material resources and financial resources are consumed for modifying the technology modification program. The air compressor control system and the control method of the compressed air system, which are portable, universal, modularized, flexible in expansion, capable of changing the number of air compressors of a main air compressor unit, each stage of standby air compressor unit and a full air compressor station and start-stop control parameters, are not disclosed at present, but do not need to change or redesign a written control program on a large scale.
Disclosure of Invention
The invention provides an air compressor control system and a control method, and the method is a portable, universal and modularized air compressor control method; the system can be flexibly expanded, when the control system technology is modified, the number of the main start, the standby start and the full air compressor station air compressors can be flexibly changed, and the control program is not required to be changed or redesigned on a large scale, and only the control parameters are required to be modified through a human-computer interaction device; greatly saves manpower, material resources and financial resources.
The technical scheme adopted by the invention is as follows:
the air compressor control system comprises a pressurizing device, a sensor, a general control function module and a man-machine interaction device, wherein the pressurizing device is used for pressurizing pressureless air in a pressureless container to the pressure container;
the pressing equipment comprises n air compressors, the numbers of the n air compressors are 1# and 2# … … n #, the pressing equipment is connected with a general control function module, and the general control function module controls the starting and stopping of the pressing equipment; the n air compressors are divided into m+1 groups from high to low according to the priority of the air compressors, wherein the m groups are respectively a 0-level main air compressor unit, a 1-level standby air compressor unit and a … … m-level standby air compressor unit, and m is a natural number. The plurality of sensors are respectively arranged on the pressure container, the pressureless container and the pressurizing equipment and are used for collecting the pressure of the pressure container, the running state of the air compressor of the pressurizing equipment, the fault state of the air compressor, the manual and automatic state of the air compressor and the running times of the air compressor, and the running time of the air compressor;
the universal control functional module is used for automatically controlling n air compressors in the pressurizing equipment and is connected with the man-machine interaction device.
The pressure vessel is connected with the pressurizing equipment through a first pipeline, and the pressurizing equipment is connected with the pressureless vessel through a second pipeline.
The sensors are connected with the universal control functional module through an electric loop, and are used for collecting pressure of the pressure container, pressure of the pipeline system, operation state of the air compressor of the pressurizing equipment, failure state of the air compressor, manual and automatic state of the air compressor and operation times of the air compressor, and the operation time of the air compressor is transmitted to the universal control functional module through the electric loop.
The general control function module receives control parameters of the compressed air system set by the man-machine interaction device through a communication loop: start-stop parameters, air compressor station parameters, rotation parameters, and according to the compressed gas system status signals collected by the sensor 5 received through the electrical circuit: pressure vessel 1 pressure P', piping system pressure P, and all air compressor machine multiple operating mode factor status signals that directly or indirectly obtain: the method comprises the steps of performing logic processing on the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor, the operation time of the air compressor and the like by adopting an air compressor control method, automatically controlling n air compressors in the pressurizing equipment through an electric loop, and simultaneously transmitting state parameter information of a compressed air system to a human-machine interaction device through a communication loop.
The start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n 。
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m 。
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and the running state weight value e of the air compressor.
And the man-machine interaction device is communicated with the general control function module. And setting control parameters of a compressed gas system by a user through a man-machine interaction device: and the start-stop parameter, the air compressor station parameter and the rotation parameter are transmitted to the general control function module, and meanwhile, the man-machine interaction device acquires the compressed gas system state parameter information sent by the general control function module to carry out graphical display.
The compressed gas system state parameter information comprises a rotation sequence, pressure vessel pressure, pipeline system pressure, an air compressor operation state of pressurizing equipment, an air compressor fault state, an air compressor manual automatic state, operation times of the air compressor and operation time of the air compressor.
And the electric loop is connected with the sensor and the general control function module, and the pressing equipment and the general control function module realize the transmission of state signals and control signals.
And the communication loop is connected with the general control function module and the man-machine interaction device to realize the transmission of control parameters and state information of the compressed gas system.
The functional structure of the general control functional module comprises a starting air compressor quantity calculating module, a rotation sequencing module and a starting and stopping air compressor control module;
the number calculation module of the air compressors is started, and according to control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel pressure P', the pipeline 3 system pressure P and the like, and the quantity x of the air compressors is output to the air compressor starting and stopping control module by adopting a method for calculating the quantity of the air compressors.
The rotation sequencing module is used for controlling parameters according to the compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the method comprises the steps of adopting a priority wheel change sequencing method to output a rotation sequence to a start-stop air compressor control module, wherein the operation state of an air compressor of a pressing device, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor, the operation time of the air compressor and the like. The rotation sequence is an air compressor number sequence array, and the rotation sequence is sequentially arranged according to the order of the priority of the air compressors corresponding to the air compressor numbers from high to low.
The starting and stopping air compressor control module is used for receiving information such as the starting air compressor quantity x output by the starting air compressor quantity calculation module, the rotation sequence output by the rotation sequencing module and the like, and according to state signals of various working condition factors of all air compressors of the compressed air system: the air compressor running state of the pressing device adopts a start-stop air compressor control method, and outputs a start-stop control signal of the air compressor to the pressing device.
The control method of the air compressors comprises a calculation method of the number of the air compressors, a priority wheel change sequencing method and a control method of the air compressors;
the method for calculating the number of the air compressors comprises the following steps:
step 1: starting up the initialization of the air compressor quantity calculation module and the middle auxiliary control variable i 0 ＝i 1 ＝……＝i m =0, x=0, go to step 2. Meaning of each parameter representation referred to in step 1: i.e 0 、i 1 ……i m I as intermediate auxiliary control variable m Air compressor number N for marking m-level standby air compressor unit m Whether the addition and subtraction calculation of the quantity x of the air compressors is participated or not, if i m =1, then N m The quantity x of the air compressors added; if i m =0, then N m Has been subtracted from the number x of air compressors started.
Step 2: acquisition parameters P, P 0 、P 0 ’、P 1 、P 1 ’……P m 、P m ’、N、N 0 、N 1 ……N m And (3) entering a step 3. In step 2Meaning of each parameter representation referred to: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n 。
Step 3: starting air compressor quantity calculation module to detect whether P<P 0 And i 0 =0, if, x=x+n 0 ，i 0 =1, go to step 4; if not, enter step 4.
Step 4: starting air compressor quantity calculation module to detect whether P>P 0 ' and i 0 =1, if yes, x=x-N 0 ，i 0 =0, go to step 5; if not, go to step 5.
Step 5: starting air compressor quantity calculation module to detect whether P<P 1 And i 1 =0, if, x=x+n 1 ，i 1 =1, go to step 6; if not, enter step 6.
Step 6: starting air compressor quantity calculation module to detect whether P>P 1 ' and i 1 =1, if yes, x=x-N 1 ，i 1 =0, go to step 7; if not, enter step 7.
……
Step 2m+3, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step<P m And i m =0, if, x=x+n m ，i m =1, go to 2m+4 steps; if not, enter 2m+4 step.
Step 2m+4, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step >P m ' and i m =1, if yes, x=x-N m ，i m =0, go to 2m+5 steps; if not, go to 2m+5 steps.
The method for calculating the number of the air compressors comprises 2m+5 steps in total.
When m=0, namely, the control system only has a main air compressor unit and 1 to m levels of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 5 steps in total, wherein the 2m+3 steps are the 3 rd steps, the 2m+4 steps are the 4 th steps, and the 2m+5 steps are the 5 th steps;
when m=1, namely, the control system only has a main air compressor unit and a 1-level standby air compressor unit and no 2-m-level standby air compressor unit, the method for calculating the quantity of the air compressors comprises 7 steps in total, wherein the 2m+3 steps are the 5 th steps, the 2m+4 steps are the 6 th steps, and the 2m+5 steps are the 7 th steps;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the quantity of the air compressors comprises 9 steps in total, wherein the 2m+3 steps are the 7 th steps, the 2m+4 steps are the 8 th steps, and the 2m+5 steps are the 9 th steps;
and so on.
The line 3 system pressure P can also be replaced by the pressure vessel 1 pressure P' in the above-described method.
The priority level round-robin sequencing method comprises the following steps:
step 1: the rotation sequencing module acquires the total number N of air compressors of the compressed air system.
Step 2: the rotation sequencing module collects various working condition factor state signals of all the air compressors, and calculates and determines various working condition values of all the air compressors.
Step 3: the rotation sequencing module acquires weight values of various working condition factors of all air compressors.
Step 4: and the rotation sequencing module calculates the priority score of each air compressor according to the working condition values corresponding to various working condition factors of all the air compressors and the corresponding weight values.
Step 5: the rotation sequencing module ranks all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array from high to low according to the priority of the air compressors;
step 6: and the rotation sequencing module outputs an air compressor number sequence array.
Step 7: and (3) detecting the running states of all the air compressors by the rotation sequencing module, and returning to the step (2) if the air compressors stop running.
In the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor. The steps of the invention take the five working condition factors as examples, and the working condition factors can be expanded according to the actual application conditions during actual application.
According to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the working condition value V takes a value of 0. Let the working condition value of n-number air compressor be V n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the working condition value X takes a value of 0. Let the working condition value of n-number air compressor be X n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the manual and automatic state of the air compressors is 'automatic', the state working condition value Y takes a value of 1; if the manual and automatic state of the air compressor is manual, the working condition value Y in the state takes a value of 0. The reason for this is that the manual state of the air compressor is set to "automatic" higher priority than to "manual". Let the working condition value of n-number air compressor be Y n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, the number of the rising edges of the running states of the air compressors can be counted according to the running states of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2 … N … N-1 and N. Where N.gtoreq.n.gtoreq.1. Let the frequency operating mode value of n-number air compressor be Z n 。
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the corresponding air compressor. Where N.gtoreq.n.gtoreq.1. Let the number of times operating mode value of n number air compressor machine be U n 。
In the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and e, an operation state weight value e of the air compressor.
The user sets the weight values corresponding to various working condition factors according to the self requirements, and generally, the more important the working condition factors are, the larger the influence is, and the larger the weight is. Normally, in order to ensure normal functions, the necessary working condition factors include the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and less than b. If the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0.
In the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n ＝aX n +bY n +cZ n +dU n +eV n 。
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn is
M n1 ≧M n2 ≧……≧M nN-1 ≧M nN According to the priority of the air compressor from high to low, corresponding to the airThe press number sequence is as follows: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]。
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
The control method for starting and stopping the air compressor comprises the following steps:
1. the start-stop air compressor control module 12 collects the air compressor number sequences team [ N ], x and the running state of the air compressor, and then the step 2 is entered.
2. And starting all the air compressors in a non-running state in all the air compressors with the first x elements in the air compressor number of team [ N ]. Expressed in language C-like form:
for(j＝0，j<x,j++)
{
if (the team [ j ] number air compressor is in a non-running state), starting the team [ j ] number air compressor;
}
and then proceeds to step 3.
3. And after the air compressors with the number of team [ N ] of the first x elements are removed, stopping all the air compressors in the running state in all the remaining air compressors. Expressed in language C-like form:
for(j＝x，j<N,j++)
{
if (the team [ j ] number air compressor is in an operation state), stopping the team [ j ] number air compressor;
}
and then returns to step 1.
In the above method, j is an intermediate control variable and is a natural number.
The invention relates to a control system and a control method of an air compressor, which have the following technical effects:
1) By adopting the air compressor control system and the control method, the problems that when the technology of the air compressor station of the compressed air system is modified, the number of the air compressors of the 0-level main air compressor unit, each-level standby air compressor unit and the full air compressor station is changed, the start-stop pressure of the 0-level main air compressor unit and each-level standby air compressor unit is changed, and when the weight values corresponding to various working condition factors are changed, the control program is required to be rewritten or changed in a large scale can be solved. The method is a portable, universal and modularized air compressor control method, can be flexibly expanded, can flexibly change the number of the air compressors of the 0-level main air compressor unit, each-level standby air compressor unit and the full air compressor station when the control system technology is modified, can flexibly change the start-stop pressure of the 0-level main air compressor unit and each-level standby air compressor unit, and can flexibly change the weight value corresponding to various working condition factors without large-scale modification or redesign of the universal control method of the air compressor of the compressed air system for writing control programs, and can greatly save manpower, material resources and financial resources by only modifying the parameters of the air compressor station, the start-stop parameters and the rotation parameters through a man-machine interaction device.
2) The air compressor control method provided by the invention has wide applicability. The start-stop parameter, the air compressor station parameter and the rotation parameter can be flexibly set according to actual needs, and the conditions are not limited.
3) The number of the air compressors is calculated by the number of the air compressors, the rotation sequencing module is a priority rotation sequencing method, the modularized programming is realized, and the control module of the air compressors is a control method of the air compressors, and the modularized programming is realized. After the modularized programming is realized, the single control function module has simple and efficient program, fewer execution sentences, low memory occupancy rate, short execution period and higher efficiency. After the modular programming is realized, the functions of the modules are relatively independent and stable, the modules are not easily influenced by the mutual coupling of other programs, the programs are easy to read and maintain, and the program running is not easy to make mistakes and fly away. After the modular programming is realized, the complex functions can be simplified, and the complex and difficult-to-realize functions are disassembled into simple and easy-to-realize sub-functions, so that the design, the extension and the derivatization are convenient.
Drawings
Fig. 1 is a schematic structural diagram of a control system of an air compressor according to the present invention.
Fig. 2 is a schematic diagram of the general control function module structure of the present invention.
Fig. 3 is a flow chart of a method for calculating the number of air compressors.
Fig. 4 is a flow chart of the priority round robin sequencing method of the present invention.
Fig. 5 is a schematic flow chart of a control method of the start-stop air compressor of the invention.
Detailed Description
As shown in fig. 1, the air compressor control system of the invention is designed with a plurality of air compressors as pressurizing devices, and comprises a pressure container 1, a non-pressure container 2, a pipeline 3, pressurizing devices 4, a sensor 5, a general control function module 6, a man-machine interaction device 7, an electric circuit 8 and a communication circuit 9.
The pressure vessel 1 is a pressurized gas tank, stores pressurized gas, and waits for the pressurizing device 4 to pressurize the pressureless gas in the pressureless vessel 2 to the pressure vessel 1.
The pressureless container 2 is a pressureless gas tank or gas bag, storing pressureless gas.
The pressure vessel 1 is connected with a pressurizing device 4 through a first pipeline 3, and the pressurizing device 4 is connected with the pressureless vessel 2 through a second pipeline.
The pressing device 4 is n air compressors, the numbers of the n air compressors are 1# and 2# … … n#, and the starting and stopping control of the universal control function module 6 is received through the electric loop 8.
The sensor 5 collects physical quantity parameters or status signals of the pressure vessel 1, the pressureless vessel 2, the pipeline and the pressurizing device 4 in the compressed gas system, such as pressure of the pressure vessel 1, pressure of the pipeline 3, running state of the air compressor of the pressurizing device 4, fault state of the air compressor, manual automatic state of the air compressor, running times of the air compressor, running time of the air compressor and the like, and transmits the signals to the general control function module 6 through the electric loop 8.
The general control function module 6 receives the control parameters of the compressed air system set by the man-machine interaction device 7 through the communication loop 9: start-stop parameters, air compressor station parameters, rotation parameters, and according to the compressed gas system status signals collected by the sensor 5 received through the electrical circuit 8: pressure vessel 1 pressure P', line 3 system pressure P; and directly or indirectly acquiring state signals of various working conditions of all air compressors: the air compressor running state, the air compressor fault state, the air compressor manual-automatic state, the air compressor running times, the air compressor running time and the like of the pressing equipment 4 are logically processed by adopting a general control method of a compressed air system air compressor, n air compressors in the pressing equipment 4 are automatically controlled through an electric loop 8, and meanwhile, the compressed air system state parameter information is transmitted to a human-machine interaction device 7 through a communication loop 9.
The start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n 。
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m 。
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and the running state weight value e of the air compressor.
The man-machine interaction device 7 communicates with the general control function module 6. Control parameters of the compressed air system set by a user through the man-machine interaction device 7: the start-stop parameter, the air compressor station parameter and the rotation parameter are transmitted to the universal control function module 6, and meanwhile, the man-machine interaction device 7 collects the compressed gas system state parameter information which is transmitted by the universal control function module 6 and comprises a rotation sequence to carry out graphical display.
The human-computer interaction device 7 adopts a touch screen with the brand name of Rockwell and the model number of 2711pc-T10C4D 1.
And the electric loop 8 is connected with the sensor 5 and the general control function module 6, and the pressing device 4 and the general control function module 6, so that transmission of state signals and control signals is realized.
And the communication loop 9 is connected with the general control function module 6 and the man-machine interaction device 7 to realize the transmission of control parameters and state information of the compressed gas system.
The functional structure of the general control functional module 6 consists of a starting air compressor quantity calculating module 10, a rotation ordering module 11 and a starting air compressor control module 12.
The general control function module 6 adopts a PLC with the brand name of Rockwell and model number of 1769-L31 1769-L35E CompactLogix.
The number calculation module 10 of the air compressors is started according to the control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel 1 pressure P', the pipeline 3 system pressure P and the like adopt a method for calculating the number of the air compressors, and the number x of the air compressors is output to the air compressor starting and stopping control module 12.
The rotation sequencing module 11 controls parameters according to the compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the air compressor operation state, the air compressor fault state, the air compressor manual-automatic state, the operation times of the air compressor, the operation time of the air compressor and the like of the pressing equipment 4 adopt a priority wheel switching order method, and a switching sequence is output to the start-stop air compressor control module 12. The rotation sequence is an air compressor number sequence array, and the rotation sequence is sequentially arranged according to the order of the priority of the air compressors corresponding to the air compressor numbers from high to low.
The start-stop air compressor control module 12 receives information such as the number x of the start air compressors output by the start air compressor number calculation module 10, the rotation sequence output by the rotation sequencing module 11, and the like, and according to state signals of various working condition factors of all air compressors of the compressed air system: the air compressor running state of the pressing device 4 adopts a start-stop air compressor control method, and outputs an air compressor start-stop control signal to the pressing device 4.
The control method of the air compressors comprises a method for calculating the number of the air compressors, a priority wheel changing and sequencing method and a method for controlling the air compressors to be started and stopped.
The method for calculating the number of the air compressors comprises the following detailed steps:
step 1: the number calculation module 10 of the air compressors is initialized, and an intermediate auxiliary control variable i is calculated 0 ＝i 1 ＝……＝i m =0, x=0, go to step 2. Meaning of each parameter representation referred to in step 1: i.e 0 、i 1 ……i m I as intermediate auxiliary control variable m Air compressor number N for marking m-level standby air compressor unit m Whether the addition and subtraction calculation of the quantity x of the air compressors is participated or not, if i m =1, then N m The quantity x of the air compressors added; if i m =0, then N m Has been subtracted from the number x of air compressors started.
Step 2: acquisition parameters P, P 0 、P 0 ’、P 1 、P 1 ’……P m 、P m ’、N、N 0 、N 1 ……N m And (3) entering a step 3. Meaning of each parameter representation referred to in step 2: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Equal (m is a natural number), and stopping pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' etc. (m is a natural number). Wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n 。
Step 3: the number calculation module 10 of the air compressors is started to detect whether P is detected<P 0 And i 0 =0, if, x=x+n 0 ，i 0 =1, go to step 4; if not, enter step 4.
Step 4: the number calculation module 10 of the air compressors is started to detect whether P is detected>P 0 ' and i 0 =1, if yes, x=x-N 0 ，i 0 =0, go to step 5; if not, go to step 5.
Step 5: the number calculation module 10 of the air compressors is started to detect whether P is detected<P 1 And i 1 =0, if, x=x+n 1 ，i 1 =1, go to step 6; if not, enter step 6.
Step 6: the number calculation module 10 of the air compressors is started to detect whether P is detected>P 1 ' and i 1 =1, if yes, x=x-N 1 ，i 1 =0, go to step 7; if not, enter step 7.
……
Step 2m+3, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step<P m And i m =0, if, x=x+n m ，i m =1, go to 2m+4 steps; if not, enter 2m+4 step.
Step 2m+4, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step >P m ' and i m =1, if yes, x=x-N m ，i m =0, go to 2m+5 steps; if not, enter 2m+5 step.
The method for calculating the number of the air compressors comprises 2m+5 steps in total.
When m=0, namely, the control system only has a main air compressor unit and 1 to m levels of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 5 steps in total, wherein the 2m+3 steps are the 3 rd steps, the 2m+4 steps are the 4 th steps, and the 2m+5 steps are the 5 th steps;
when m=1, namely, the control system only has a main air compressor unit and a 1-level standby air compressor unit and no 2-m-level standby air compressor unit, the method for calculating the quantity of the air compressors comprises 7 steps in total, wherein the 2m+3 steps are the 5 th steps, the 2m+4 steps are the 6 th steps, and the 2m+5 steps are the 7 th steps;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the quantity of the air compressors comprises 9 steps in total, wherein the 2m+3 steps are the 7 th steps, the 2m+4 steps are the 8 th steps, and the 2m+5 steps are the 9 th steps;
and so on.
The line 3 system pressure P can also be replaced by the pressure vessel 1 pressure P' in the present method.
The detailed steps of the priority round robin sequencing method are as follows:
step 1: the rotation sequencing module 11 collects the total number N of the air compressors of the compressed air system.
Step 2: the rotation sequencing module 11 collects various working condition factor state signals of all the air compressors, and calculates and determines various working condition values of all the air compressors.
Step 3: the rotation sequencing module 11 collects weight values of various working condition factors of all air compressors.
Step 4: the rotation sequencing module 11 calculates the priority score of each air compressor according to the working condition values corresponding to the working condition factors of all the air compressors and the corresponding weight values.
Step 5: the rotation sequencing module 11 sequences the priority of all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array according to the priority of the air compressors from high to low;
step 6: the rotation sequencing module 11 outputs an air compressor number sequence array.
Step 7: the rotation sequencing module 11 detects the operation states of all the air compressors, and if the air compressors stop operating, the step 2 is returned.
In the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor. The steps of the invention take the four working condition factors as examples, and the working condition factors can be expanded according to the actual application conditions during actual application.
According to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the working condition value V takes a value of 0. Let the working condition value of n-number air compressor be V n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the working condition value X takes a value of 0. Let the working condition value of n-number air compressor be X n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, if the manual and automatic state of the air compressors is 'automatic', the state working condition value Y takes a value of 1; if the manual and automatic state of the air compressor is manual, the working condition value Y in the state takes a value of 0. The reason for this is that the manual state of the air compressor is set to "automatic" higher priority than to "manual". Let the working condition value of n-number air compressor be Y n . Where N.gtoreq.n.gtoreq.1.
In all the air compressors, the number of the rising edges of the running states of the air compressors can be counted according to the running states of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2 … N … N-1 and N. Where N.gtoreq.n.gtoreq.1. Let the frequency operating mode value of n-number air compressor be Z n 。
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the corresponding air compressor. Where N.gtoreq.n.gtoreq.1. Let the number of times operating mode value of n number air compressor machine be U n 。
In the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and e, an operation state weight value e of the air compressor.
The user sets the weight values corresponding to various working condition factors according to the self requirements, and generally, the more important the working condition factors are, the larger the influence is, and the larger the weight is. Normally, in order to ensure normal functions, the necessary working condition factors include the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and less than b. If the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0.
In the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n ＝aX n +bY n +cZ n +dU n +eV n 。
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn is
M n1 ≧M n2 ≧……≧M nN-1 ≧M nN According to the priority of the air compressors from high to low, the corresponding air compressor number sequences are as follows: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]。
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
The control method for the start-stop air compressor comprises the following detailed steps:
1. the start-stop air compressor control module 12 collects the air compressor number sequences team [ N ], x and the running state of the air compressor, and then the step 2 is entered.
2. And starting all the air compressors in a non-running state in all the air compressors with the first x elements in the air compressor number of team [ N ]. Expressed in language C-like form:
for(j＝0，j<x,j++)
{
if (the team [ j ] number air compressor is in a non-running state), starting the team [ j ] number air compressor;
}
and then proceeds to step 3.
3. And after the air compressors with the number of team [ N ] of the first x elements are removed, stopping all the air compressors in the running state in all the remaining air compressors. Expressed in language C-like form:
for(j＝x，j<N,j++)
{
if (the team [ j ] number air compressor is in an operation state), stopping the team [ j ] number air compressor; }
And then returns to step 1.
In the method, j is an intermediate control variable and is a natural number.
Claims (10)
1. The utility model provides an air compressor machine control system, includes equipment of beating (4), sensor (5), general control function module (6), human-computer interaction device (7), its characterized in that:
the pressurizing device (4) is used for pressurizing the pressureless gas in the pressureless container (2) to the pressure container (1);
the pressing equipment (4) comprises n air compressors, the numbers of the n air compressors are 1# and 2# … … n #, the pressing equipment (4) is connected with a general control functional module (6), and the general control functional module (6) controls the starting and stopping of the pressing equipment (4); the n air compressors are divided into m+1 groups from high to low according to the priority of the air compressors, wherein the m is a natural number, and the n air compressors are respectively a 0-level main air compressor unit, a 1-level standby air compressor unit and a … … m-level standby air compressor unit;
the plurality of sensors (5) are respectively arranged on the pressure container (1), the pressureless container (2) and the pressing equipment (4) and are used for collecting the pressure of the pressure container (1), the running state of the air compressor of the pressing equipment (4), the fault state of the air compressor, the manual state of the air compressor and the running times of the air compressor, and the running time of the air compressor, wherein the plurality of sensors (5) are all connected with the universal control function module (6);
The universal control functional module (6) is used for automatically controlling n air compressors in the pressurizing equipment (4), and the universal control functional module (6) is connected with the man-machine interaction device (7).
2. An air compressor control system according to claim 1, wherein: the general control function module (6) receives control parameters of the compressed air system set by the man-machine interaction device (7) through the communication loop (9): start-stop parameters, air compressor station parameters, rotation parameters, and according to the compressed gas system status signals collected by the sensor 5 received through the electrical circuit 8: pressure vessel (1) pressure P', pipeline system pressure P, and all air compressor machine multiple operating mode factor state signals that direct or indirect acquisition: the operation state of the air compressor, the fault state of the air compressor, the manual automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor are logically processed, n air compressors in the pressurizing equipment (4) are automatically controlled through an electric loop (8), and meanwhile, the state parameter information of the compressed air system is transmitted to a human-computer interaction device (7) through a communication loop (9).
3. An air compressor control system according to claim 2, wherein:
the start-stop parameters include: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m M is a natural number, and the stopping pressure P of the 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m ' wherein P 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n ；
The air compressor station parameters include: total number of air compressors N of compressed air system and number of air compressors N of main air compressor unit 0 Air compressor number N of 1-level standby air compressor unit 1 … … m-level air compressor unit equipped air compressor number N m ；
The rotation parameters include: a fault state weight value a of the air compressor; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; and e, an operation state weight value e of the air compressor.
4. An air compressor control system according to claim 1, wherein: the general control function module (6) comprises a starting air compressor quantity calculating module (10), a rotation ordering module (11) and a starting air compressor control module (12);
the air compressor starting quantity calculating module (10) is used for calculating the quantity of the air compressors according to control parameters of the compressed air system: start-stop parameters, air compressor station parameters, and compressed gas system status signals: the pressure vessel (1) pressure P', pipeline system pressure P and the like, and the number x of the air compressors is output to the air compressor starting and stopping control module (12) by adopting a method for calculating the number of the air compressors;
The rotation sequencing module (11) is used for controlling parameters according to a compressed gas system: rotation parameters and state signals of various working condition factors of all air compressors of the compressed air system: the operation state of the air compressor of the pressurizing equipment (4), the failure state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor, the operation time of the air compressor, adopting a priority wheel change sequencing method, and outputting a rotation sequence to a start-stop air compressor control module (12);
the starting and stopping air compressor control module (12) is used for receiving information such as the starting air compressor number x output by the starting air compressor number calculation module (10), the rotation sequence output by the rotation sequencing module (11) and the like, and according to the state signals of various working condition factors of all air compressors of the compressed air system: the air compressor running state of the pressing device (4) adopts a start-stop air compressor control method, and outputs an air compressor start-stop control signal to the pressing device (4).
5. The method for calculating the number of the air compressors is characterized by comprising the following steps of:
step 1: the number calculation module (10) of the air compressors is started to initialize, and the intermediate auxiliary control variable i is calculated 0 ＝i 1 ＝……＝i m =0, x=0, go to step 2; meaning of each parameter representation referred to in step 1: i.e 0 、i 1 ……i m I as intermediate auxiliary control variable m Air compressor number N for marking m-level standby air compressor unit m Whether the addition and subtraction calculation of the quantity x of the air compressors is participated or not, if i m =1, then N m The quantity x of the air compressors added; if i m =0, then N m Has been subtracted from the number x of air compressors started;
step 2: acquisition parameters P, P 0 、P 0 ’、P 1 、P 1 ’……P m 、P m ’、N、N 0 、N 1 ……N m Step 3, entering a step; meaning of each parameter representation referred to in step 2: starting pressure P of 0-level main air compressor unit 0 Starting pressure P of 1-level air compressor unit 1 Stopping pressure P of 1-level air compressor unit 1 ' … … m-level air compressor set starting pressure P m Stop pressure P of 0-level main air compressor unit 0 ' 1-stage air compressor unit stop pressure P 1 ' 1-stage air compressor unit stop pressure P 1 ' … … m-level air compressor set stop pressure P m 'A'; wherein P is 0 ’>P 0 >P 1 >P 2 >……>P m ，P 1 ’>P 1 ，……，P n ’>P n ；
Step 3: the number calculation module (10) of the air compressors is started to detect whether P is detected or not<P 0 And i 0 =0, if, x=x+n 0 ，i 0 =1, go to step 4; if not, entering a step 4;
step 4: the number calculation module (10) of the air compressors is started to detect whether P is detected or not>P 0 ' and i 0 =1, if yes, x=x-N 0 ，i 0 =0, go to step 5; if not, entering a step 5;
step 5: the number calculation module (10) of the air compressors is started to detect whether P is detected or not<P 1 And i 1 =0, if, x=x+n 1 ，i 1 =1, go to step 6; if not, entering a step 6;
step 6: the number calculation module (10) of the air compressors is started to detect whether P is detected or not >P 1 ' and i 1 =1, if yes, x=x-N 1 ，i 1 =0, go to step 7; if not, entering a step 7;
……
step 2m+3, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step<P m And i m =0, if, x=x+n m ，i m =1, go to 2m+4 steps; if not, enter 2m+4 step;
step 2m+4, starting the air compressor number calculation module 10 to detect whether P is the same as the previous step>P m ' and i m =1, if yes, x=x-N m ，i m =0, go to 2m+5 steps; if not, enter 2m+5 step;
step 2+5, starting the air compressor quantity calculation module 10 to output x, and returning to step 2.
6. The method for calculating the number of the air compressors according to claim 5, wherein:
when m=0, namely, the control system only has a main air compressor unit and 1 to m levels of standby air compressor units are not provided, the method for calculating the number of the air compressors comprises 5 steps in total, wherein the 2m+3 steps are the 3 rd steps, the 2m+4 steps are the 4 th steps, and the 2m+5 steps are the 5 th steps;
when m=1, namely, the control system only has a main air compressor unit and a 1-level standby air compressor unit and no 2-m-level standby air compressor unit, the method for calculating the quantity of the air compressors comprises 7 steps in total, wherein the 2m+3 steps are the 5 th steps, the 2m+4 steps are the 6 th steps, and the 2m+5 steps are the 7 th steps;
when m=2, namely, the control system only has a main air compressor unit, a 1-level standby air compressor unit and a 2-level standby air compressor unit, and no 3-m-level standby air compressor unit, the method for calculating the number of the air compressors comprises 9 steps in total, wherein the 2m+3 steps are the 7 th steps, the 2m+4 steps are the 8 th steps, and the 2m+5 steps are the 9 th steps.
7. A priority wheel change sequencing method of an air compressor is characterized in that: the method comprises the following steps:
step 1: the rotation sequencing module (11) collects the total number N of air compressors of the compressed air system;
step 2: the rotation sequencing module (11) collects state signals of various working condition factors of all the air compressors, and calculates and determines various working condition values of all the air compressors;
step 3: the rotation sequencing module (11) collects weight values of various working condition factors of all air compressors;
step 4: the rotation sequencing module (11) calculates the priority score of each air compressor according to the working condition values corresponding to various working condition factors of all the air compressors and the corresponding weight values;
step 5: the rotation sequencing module (11) sequences the priorities of all the air compressors in the system according to the priority score of each air compressor, and obtains a corresponding air compressor number sequence array according to the priority of the air compressors from high to low;
step 6: the rotation sequencing module (11) outputs an air compressor number sequence array;
step 7: and (3) detecting the running states of all the air compressors by the rotation sequencing module (11), and returning to the step (2) if the air compressors stop running.
8. The method for calculating the number of the air compressors according to claim 7, wherein: in the step 2, the multiple working condition factors include: the operation state of the air compressor, the fault state of the air compressor, the manual and automatic state of the air compressor, the operation times of the air compressor and the operation time of the air compressor;
According to various working condition factors, various working condition values of all air compressors are determined as follows:
in all the air compressors, if the air compressors are in an operation state, the value of the working condition value V is 1; if the air compressor is in a non-running state, the value of the working condition value V is 0; let the working condition value of n-number air compressor be V n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all the air compressors, if the air compressors are in a non-fault state, the value of the working condition value X is 1; if the air compressor cannot work normally, the value of the working condition value X is 0; let the working condition value of n-number air compressor be X n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all air compressors, if the manual state of the air compressor is'When the system is automatic, the value of the state working condition value Y is 1; if the manual and automatic state of the air compressor is manual, the working condition value Y of the state is 0; the reason for this is that the manual state of the air compressor is set to be "automatic" with higher priority than "manual"; let the working condition value of n-number air compressor be Y n The method comprises the steps of carrying out a first treatment on the surface of the Wherein N > 1;
in all the air compressors, the number of the rising edges of the running states of the air compressors can be counted according to the running states of the air compressors to obtain the running times of the air compressors, the running times of the air compressors are ordered, and the working condition value Z of the times of the air compressors corresponding to the times from high to low sequentially takes values of 1,2 … N … N-1 and N; wherein N > 1; let the frequency operating mode value of n-number air compressor be Z n ；
In all the air compressors, the running time of the air compressors can be obtained by timing the accumulated duration time of the running state of the air compressors according to the running state of the air compressors, the running time of the air compressors is ordered, and the time is sequentially 1,2 … N … N-1 and N from the time of the corresponding air compressor to the time of the short air compressor; wherein N > 1; let the number of times operating mode value of n number air compressor machine be U n 。
9. The method for calculating the number of the air compressors according to claim 7, wherein:
in the step 3, a fault state weight value a of the air compressor is acquired and set; the manual and automatic state weight value b of the air compressor; a weight value c of the running times of the air compressor; a weight value d of the running time of the air compressor; an operation state weight value e of the air compressor;
the user sets weight values corresponding to various working condition factors according to the self requirements, and the more important the working condition factors are, the greater the influence is, and the greater the weight is; in order to ensure normal functions, the essential working condition factors include the running state of the air compressor, the fault state of the air compressor and the manual and automatic state of the air compressor, and e is more than a and more than b; if the start and stop are controlled only according to the operation times of the air compressor, e > a > b > c > d=0; if the start and stop are controlled only according to the operation time of the air compressor, e > a > b > d > c=0; if the start and stop are controlled according to the operation times and the operation time of the air compressor and preferentially according to the operation times of the air compressor, e > a > b > c > d >0; if the start and stop are controlled according to the operation times and the operation time of the air compressor at the same time, e > a > b > d > c >0.
10. The method for calculating the number of the air compressors according to claim 7, wherein:
in the step 4, the priority score m=ax+by+cz+du+ev of each air compressor is calculated respectively; priority score M of n-number air compressor n ＝aX n +bY n +cZ n +dU n +eV n ；
In the step 5, the priority of the air compressors is ordered according to the size of Mn, the higher the priority score Mn of the n-number air compressors is, the higher the priority is, the more the air compressor number n is arranged at the front of the position of the queue, and the more the air compressor number n is arranged at the front of the position of the queue is, the more the priority score Mn is
Then, according to the priority of the air compressor from high to low, the corresponding air compressor number sequence is as follows: { n 1 ，n 2 ，……，n N-1 ，n N ' record as a group team [ N ]]；
In the step 6, the sequence of the air compressor number is output: { n 1 ，n 2 ，……，n N-1 ，n N "array team [ N ]]。
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