CN109213065B - Water-cooling water chilling unit testing system and method based on PLC control - Google Patents
Water-cooling water chilling unit testing system and method based on PLC control Download PDFInfo
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- CN109213065B CN109213065B CN201811129897.2A CN201811129897A CN109213065B CN 109213065 B CN109213065 B CN 109213065B CN 201811129897 A CN201811129897 A CN 201811129897A CN 109213065 B CN109213065 B CN 109213065B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/15—Plc structure of the system
- G05B2219/15039—Display of reference, set value, of measured, feedback value
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- Feedback Control In General (AREA)
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Abstract
The invention discloses a water-cooling chiller unit test system and method based on PLC control, the system comprises a PLC, used for storing addresses corresponding to a plurality of regulating measuring points needing to set P/I/D parameters one by one, reading addresses corresponding to the regulating measuring points needing to set P/I/D parameters at the current moment, setting the P/I/D parameters before setting the addresses, writing the set P/I/D parameters into a regulator, reading the P/I/D parameters in the regulator and writing the P/I/D parameters into the addresses corresponding to the current moment after the regulator finishes setting the P/I/D parameters, then reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the next moment, circulating in sequence, after all the regulating measuring points only have the set P/I/D parameters, PID instructions in the PLC control the output of corresponding actuators; and the regulator is used for setting the P/I/D parameters required by each group of regulating measuring points. The invention has the advantages that: and the regulator and a plurality of PID instructions of the PLC are jointly controlled to realize accurate and rapid regulation of the regulation measuring point.
Description
Technical Field
The invention relates to the field of automatic control, in particular to a water-cooling water chilling unit testing system and method based on PLC control.
Background
The system for testing the refrigerating capacity/heating capacity of the water-cooling water chilling unit balances or offsets the cold capacity generated by chilled water when the unit refrigerates by using the heat generated by the chilled water, and takes away redundant heat by using a cooling tower or other cooling equipment to obtain the balance of system energy; the stable test water temperature is obtained by controlling and adjusting the amount of the chilled water mixed into the cooling water system and simultaneously controlling the load of the cooling system.
An automatic control system needs to automatically adjust the working state of an actuator through the actual environment and the target environment of the actuator operation, so that a P/I/D (proportional/Integral/Derivative) parameter needs to be adjusted, and in the prior art, two methods are mainly applied: one is to only use a Programmable Logic Controller (PLC) to realize the regulation control function, and the control mode calls a PIDAT instruction of the PLC, but the set P/I/D parameter is not ideal, so that the time for the target environment to enter a stable state is too long; and the other is that all the regulation control measuring points are regulated and controlled by a digital regulator, and the PLC only controls the start and stop of the equipment, so that although a fast and stable test system can be obtained by the control mode, the cost of the device is higher.
Therefore, how to make the environment of the actuator quickly reach the target environment and enter a stable state under the condition of reducing the cost is an urgent technical problem to be solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a water-cooling water chilling unit testing system and method based on PLC control.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water-cooling water chilling unit test system based on PLC control comprises
The PLC is used for storing addresses corresponding to a plurality of regulating measuring points needing to set the P/I/D parameters one by one, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the current moment, setting the P/I/D parameters before the addresses are set, writing the set P/I/D parameters into the regulator, reading the P/I/D parameters in the regulator and writing the P/I/D parameters into the addresses corresponding to the current moment after the regulator finishes setting the P/I/D parameters, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the next moment, sequentially circulating, and controlling the output of the actuator by PID instructions in the PLC after all the regulating measuring points have the set P/I/D parameters;
and the regulator is used for setting the P/I/D parameters required by each group of regulating measuring points.
Preferably, the number of the regulators is 1.
And optimally, the system also comprises a data acquisition mechanism for acquiring real-time data of the execution environment, the data acquisition mechanism is connected with the PLC, and the data acquisition mechanism transmits the acquired real-time data of the execution environment to the PLC.
Preferably, the system further comprises a calculating mechanism used for obtaining real-time refrigerating capacity andor heating capacity, the calculating mechanism is connected with the data acquisition mechanism, receives the real-time data of the execution environment acquired by the data acquisition mechanism, and performs data processing according to the target data of the execution environment stored in the calculating mechanism to obtain the real-time refrigerating capacity andor heating capacity.
Preferably, the data acquisition mechanism comprises a data summarizer connected with the PLC and further comprises a temperature sensor and/or a pressure sensor and/or a flow detector which transmits the detected data into the data summarizer.
The method for using the water-cooling water chilling unit test system based on PLC control comprises the following steps:
s1, the PLC reads an address n corresponding to an adjusting measuring point to be subjected to P/I/D parameter setting;
s2, the PLC sets parameters before setting the data in the address n;
s3, the PLC writes the data before the parameter in the address n is set and not adjusted into the regulator;
s4, the regulator automatically adjusts the P/I/D parameter corresponding to the address n;
s5, the PLC reads the P/I/D parameter set by the regulator and writes the P/I/D parameter into the PID instruction corresponding to the address n;
and S6, judging whether all the P/I/D parameters corresponding to all the adjusting measuring points are completely set, wherein the judgment standard is that the number of times of accessing the address n is the number of the actuators, if the setting is not completed, the step returns to the step S1 after n is n +1, and if the setting is completed, the step S7 is executed.
And S7, calculating the opening degree value of the actuator according to the actual measurement data and the target data of the actuator execution environment by the PID instruction of the PLC, wherein the target data of the execution environment is kept stable in the execution process of the actuator.
Preferably, the following two steps are further included between the step S5 and the step S6 in sequence:
calculating opening values of the actuators according to the actual measurement data and the target data of the actuator execution environment corresponding to the address n by the PID instructions of the SA and the PLC;
SB, judging whether the P/I/D parameter set by the adjusting measuring point corresponding to the address n is proper or not, if so, executing step S6, and if not, executing step S2.
In the optimization, the parameter setting before setting in step S2 includes the signal output type of the actuator, or the sampling period, or the positive/negative effect, or the filter coefficient, or the time constant, or the upper and lower output limits.
The invention has the advantages that:
(1) the invention applies the joint control of a single digital regulator and a plurality of PID instructions of the PLC, realizes the accurate and rapid regulation of all the regulation measuring points and ensures the reliable operation of the test working condition.
(2) The control method of the invention reduces the use amount of the digital regulator to the minimum, and reduces the cost to the minimum on the basis of ensuring the regulation precision and the regulation speed.
(3) The second control method of the invention can optimize the P/I/D parameter stored by the address n through the multiple circulation setting of the address n.
(4) In the invention, the data collector is used for collecting the data of the temperature sensor and/or the pressure sensor and/or the flow detector and then sending the data to the PLC, thus reducing the application interfaces of the PLC.
(5) The data acquisition mechanism acquires temperature, pressure and flow signals of an execution environment, and inputs the signals into the calculation mechanism and the PLC to calculate and obtain related performance parameters of the tested machine.
Drawings
Fig. 1 is a diagram of a water-cooling chiller unit testing system based on PLC control according to the present invention.
Fig. 2 is a flowchart of a water-cooling chiller unit testing method based on PLC control in embodiment 2 of the present invention.
Fig. 3 is a flowchart of a water-cooling chiller unit testing method based on PLC control in embodiment 3 of the present invention.
Detailed Description
Example 1
As shown in fig. 1, a water-cooling chiller unit test system based on PLC control includes a PLC, a regulator, a data acquisition mechanism, and a calculation mechanism. Wherein
The PLC is used for storing addresses corresponding to a plurality of regulating measuring points needing to set the P/I/D parameters one by one, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the current moment, setting the P/I/D parameters before the addresses are set, writing the set P/I/D parameters into the regulator, reading the P/I/D parameters in the regulator and writing the P/I/D parameters into the addresses corresponding to the current moment after the regulator finishes setting the P/I/D parameters, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the next moment, sequentially circulating, and controlling the output of the actuator by PID instructions in the PLC after all the regulating measuring points have the set P/I/D parameters;
the regulators are used for setting P/I/D parameters required by each group of regulating measuring points, and the number of the regulators is 1;
the data acquisition mechanism comprises a data summarizer connected with the PLC, a temperature sensor, a pressure sensor and a flow detector, wherein the temperature sensor, the pressure sensor and the flow detector are used for transmitting detected data to the data summarizer;
and the calculating mechanism is used for obtaining the real-time refrigerating capacity and/or heating capacity.
The computing mechanism is connected with the data acquisition mechanism, receives real-time data of the execution environment acquired by the data acquisition mechanism, processes the data according to target data of the internally stored execution environment to obtain real-time refrigerating capacity and/or heating capacity, the data acquisition mechanism is connected with the PLC, and the data acquisition mechanism transmits the acquired real-time data of the execution environment to the PLC.
In this embodiment, M +1 actuators are included.
Example 2
As shown in fig. 2, the method for using the PLC-based water cooling chiller testing system according to embodiment 1 includes the following steps:
s1, the PLC reads an address n corresponding to an adjusting measuring point to be subjected to P/I/D parameter setting;
s2, the PLC sets parameters before setting the data in the address n, and the parameter settings comprise signal output types of the actuator and/or sampling periods and/or positive/negative effects and/or filter coefficients and/or time constants and/or output upper and lower limits;
s3, the PLC writes the data before the parameter in the address n is set and not adjusted into the regulator;
s4, the regulator automatically adjusts the P/I/D parameter corresponding to the address n;
s5, the PLC reads the P/I/D parameter set by the regulator and writes the P/I/D parameter into the PID instruction corresponding to the address n;
and S6, judging whether all the P/I/D parameters corresponding to all the adjusting measuring points are completely set, wherein the judgment standard is that the number of times of accessing the address n is the number of the actuators, if the setting is not completed, the step returns to the step S1 after n is n +1, and if the setting is completed, the step S7 is executed.
And S7, calculating the opening degree value of the actuator according to the actual measurement data and the target data of the actuator execution environment by the PID instruction of the PLC, wherein the target data of the execution environment is kept stable in the execution process of the actuator.
Example 3
As shown in fig. 3, the method for using the PLC-based water cooling chiller testing system according to embodiment 1 includes the following steps:
s1, the PLC reads an address n corresponding to an adjusting measuring point to be subjected to P/I/D parameter setting;
s2, the PLC sets parameters before setting the data in the address n, and the parameter settings comprise signal output types of the actuator and/or sampling periods and/or positive/negative effects and/or filter coefficients and/or time constants and/or output upper and lower limits;
s3, the PLC writes the data before the parameter in the address n is set and not adjusted into the regulator;
s4, the regulator self-tunes out the P/I/D parameter corresponding to the address n, whether the P/I/D parameter corresponding to the address n is finished or not is judged, if yes, the step S5 is executed, and if not, the step S2 is executed again; therefore, by increasing the number of times of interaction between the regulator and the PLC, the situation that the P/I/D parameter set at one time is not necessarily the optimal parameter is avoided.
S5, the PLC reads the P/I/D parameter set by the regulator and writes the P/I/D parameter into the PID instruction corresponding to the address n;
calculating opening values of the actuators according to the actual measurement data and the target data of the actuator execution environment corresponding to the address n by the PID instructions of the SA and the PLC;
SB, judging whether the P/I/D parameter set by the adjusting measuring point corresponding to the address n is proper or not, if so, executing a step S6, and if not, executing a step S2;
s6, judging whether all the P/I/D parameters corresponding to all the adjusting measuring points are completely set, wherein the judgment standard is that the number of times of accessing the address n is the number of actuators, if the setting is not completed, the step returns to the step S1 after n is n +1, and if the setting is completed, the step S7 is executed;
and S7, calculating the opening degree value of the actuator according to the actual measurement data and the target data of the actuator execution environment by the PID instruction of the PLC, wherein the target data of the execution environment is kept stable in the execution process of the actuator.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A water-cooling water chilling unit test system based on PLC control is characterized by comprising
The PLC is used for storing addresses corresponding to a plurality of regulating measuring points needing to set the P/I/D parameters one by one, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the current moment, setting the P/I/D parameters before the addresses are set, writing the set P/I/D parameters into the regulator, reading the P/I/D parameters in the regulator and writing the P/I/D parameters into the addresses corresponding to the current moment after the regulator finishes setting the P/I/D parameters, reading addresses corresponding to the regulating measuring points needing to set the P/I/D parameters at the next moment, sequentially circulating, and controlling the output of the actuator by PID instructions in the PLC after all the regulating measuring points have the set P/I/D parameters;
and the regulator is used for setting the P/I/D parameters required by each group of regulating measuring points.
2. The PLC-control-based water-cooled chiller unit test system according to claim 1, wherein the number of regulators is 1.
3. The water-cooled chiller unit test system based on PLC control of claim 1, characterized in that, the system further comprises a data acquisition mechanism for acquiring real-time data of the execution environment of the actuator; the data acquisition mechanism is connected with the PLC, and the data acquisition mechanism transmits the real-time data acquired from the execution environment to the PLC.
4. The water-cooled chiller unit test system based on PLC control of claim 3, characterized in that, the system further comprises a calculation mechanism for obtaining real-time cooling capacity andor heating capacity, the calculation mechanism is connected with the data acquisition mechanism, the calculation mechanism receives real-time data of the execution environment acquired by the data acquisition mechanism, and performs data processing according to the target data of the execution environment stored inside to obtain real-time cooling capacity andor heating capacity.
5. The water-cooled chiller unit test system based on PLC control of claim 3, wherein the data acquisition mechanism comprises a data summarizer connected with PLC, and further comprises a temperature sensor and/or a pressure sensor and/or a flow detector for transmitting detected data into the data summarizer.
6. The method for using the PLC-based water-cooled chiller testing system according to any one of claims 1-5, is characterized by comprising the following steps:
s1, the PLC reads an address n corresponding to an adjusting measuring point to be subjected to P/I/D parameter setting;
s2, the PLC sets parameters before setting the data in the address n;
s3, the PLC writes the data before the parameter in the address n is set and not adjusted into the regulator;
s4, the regulator automatically adjusts the P/I/D parameter corresponding to the address n;
s5, the PLC reads the P/I/D parameter set by the regulator and writes the P/I/D parameter into the PID instruction corresponding to the address n;
s6, judging whether all the P/I/D parameters corresponding to all the adjusting measuring points are completely set, wherein the judgment standard is that the number of times of accessing the address n is the number of actuators, if the setting is not completed, the step returns to the step S1 after n is n +1, and if the setting is completed, the step S7 is executed;
and S7, calculating the opening degree value of the actuator according to the actual measurement data and the target data of the actuator execution environment by the PID instruction of the PLC, wherein the target data of the execution environment is kept stable in the execution process of the actuator.
7. The method of claim 6, wherein the steps S5 and S6 further comprise the following steps:
calculating opening values of the actuators according to the actual measurement data and the target data of the actuator execution environment corresponding to the address n by the PID instructions of the SA and the PLC;
SB, judging whether the P/I/D parameter set by the adjusting measuring point corresponding to the address n is proper or not, if so, executing step S6, and if not, executing step S2.
8. The method of claim 7, wherein the parameter settings before setting in step S2 include signal output type of actuator and or sampling period and or positive/negative action and or filter coefficient and or time constant and or upper and lower output limits.
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| US10197977B2 (en) * | 2014-09-02 | 2019-02-05 | Johnson Controls Technology Company | Feedback control system with normalized performance indices for setpoint alarming |
| CN206497353U (en) * | 2017-03-06 | 2017-09-15 | 潍坊三江玻璃机械有限公司 | Bottle-making machine parameter adjustment system |
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| CN107084543A (en) * | 2017-06-06 | 2017-08-22 | 珠海格力电器股份有限公司 | Water cooled chiller and its control method |
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