CN117404793A - Energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method and system - Google Patents
Energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method and system Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 238000004364 calculation method Methods 0.000 abstract description 7
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to an energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method and system, wherein the method comprises the following steps: and operating the cooling tower according to the adding and subtracting machine and the frequency modulation strategy, judging whether the cooling tower currently operated reaches the heat radiation capacity limit, namely whether the cooling tower currently operated reaches the maximum heat radiation capacity or the minimum heat radiation capacity, respectively carrying out fine adjustment on the frequency of a fan of the cooling tower to obtain the water outlet temperature of the cooling tower after frequency modulation, judging whether the water outlet temperature change of the cooling tower meets the preset condition, further obtaining a new water outlet temperature set value, and carrying out temperature control according to the new water outlet temperature set value in the preset time. By implementing the invention, the immunity of the cooling tower control system can be enhanced, and the phenomenon that the cooling water control system is influenced due to abnormal interference of the outdoor temperature and humidity sensor detection data on wet bulb temperature calculation, so that the cooling tower is excessively put into or insufficient in heat dissipation is avoided, thereby reducing the energy efficiency of the system and the service life of equipment.
Description
Technical Field
The invention relates to the field of cooling tower regulation and control, in particular to an energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control method and system.
Background
In the control of a large-scale central air-conditioning chiller, a plurality of cooling towers are usually adopted in parallel to increase the control range of a cooling side on the basis of the design principle of energy-saving control of a system, so that the aim of energy-saving control is fulfilled. In a cooling system, the feedback variable of the closed-loop control of the variable-frequency control strategy of the cooling tower fan preferentially uses the outdoor wet bulb temperature, so that the outdoor temperature and humidity sensor is required to accurately feed back the outdoor environment condition, but the sensor can not be installed at the optimal position often due to various reasons in the construction and installation process, or the sensor has accidental faults, so that the outdoor wet bulb temperature has deviation or failure condition.
Disclosure of Invention
The technical problem to be solved by the present invention is to address at least one of the drawbacks of the related art mentioned in the background art mentioned above: how to improve the control immunity of a cooling system, and provides an energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method and system.
The technical scheme adopted for solving the technical problems is as follows: the energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method comprises the following steps:
step S10: operating the cooling towers according to an add-subtract machine strategy, and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
step S20: when the minimum value is reached, judging whether the current frequency of the cooling tower fan reaches a lower limit value, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
step S30: when the maximum value is reached, judging whether the current frequency of the cooling tower fan reaches an upper limit value, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
step S40: and in a first preset period, PID adjustment is carried out on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature.
Preferably, the step S10 includes:
step S11, operating a cooling tower according to an add-subtract machine strategy;
step S12, judging whether the number of the cooling towers running at present reaches a minimum value, if so, executing step S20; if not, executing step S13;
step S13, judging whether the number of the cooling towers running at present reaches the maximum value, if so, executing step S30; if not, step S11 is performed.
Preferably, the determining whether the current frequency of the cooling tower fan reaches the lower limit value, if yes, then raising the current frequency according to a preset frequency step includes:
judging whether the current frequency of the cooling tower fan reaches the lower limit value;
if yes, judging whether the current outlet water temperature of the cooling tower is greater than the early warning set temperature;
if yes, the current frequency is increased according to a preset frequency step.
Preferably, the step of obtaining the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, if yes, calculating a current water outlet temperature set value according to the current water outlet temperature, including:
and delaying a second time after each frequency rising in the frequency rising process to acquire the current water outlet temperature of the cooling tower, judging whether the current change rate of the water outlet temperature of the cooling tower is smaller than a first preset value, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature.
Preferably, the determining whether the outlet water temperature of the cooling tower meets the first preset condition further includes:
if not, judging whether the current frequency of the cooling tower fan does not reach the upper limit value and whether the number of the cooling towers running at present does not reach the maximum value, if so, raising the current frequency according to a preset frequency step; if not, calculating the current water outlet temperature set value according to the current water outlet temperature.
Preferably, the step of obtaining the current water outlet temperature of the cooling tower in the frequency reducing process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, if yes, calculating a current water outlet temperature set value according to the current water outlet temperature, including:
and delaying for a third time after each frequency reduction in the frequency reduction process to acquire the current outlet water temperature of the cooling tower, judging whether the current variation of the outlet water temperature of the cooling tower is larger than a second preset value, and if so, calculating a current outlet water temperature set value according to the difference value of the current outlet water temperature and the current variation of the temperature.
Preferably, the determining whether the current variation of the outlet water temperature of the cooling tower is greater than a second preset value further includes:
if not, judging whether the current frequency of the cooling tower fan reaches the lower limit value, if so, reducing the current frequency according to a preset frequency step; if not, the current outlet water temperature set value is calculated according to the difference value of the current outlet water temperature and the current temperature change quantity.
Preferably, the step S40 includes:
the method comprises the steps of carrying out frequency adjustment on a cooling tower fan according to a current outlet water temperature set value, starting timing on first time, and judging whether the first time arrives or not:
if the current outlet water temperature value is not reached, the current frequency of the cooling tower fan is regulated by PID according to the current outlet water temperature set value and the current outlet water temperature;
if the temperature reaches the preset value, calculating a temperature set value according to the wet bulb temperature, and performing PID (proportion integration differentiation) adjustment on the current frequency of the cooling tower fan according to the temperature set value and the current outlet water temperature.
Preferably, the step of performing PID adjustment on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature includes:
and calculating according to the current outlet water temperature set value to obtain a set value of PID operation for regulating the cooling tower fan, and carrying out PID operation according to the current outlet water temperature obtained by the cooling tower outlet water temperature sensor and the set value of PID operation to obtain a regulating value of the rotating speed of the cooling tower fan so as to regulate the current frequency of the cooling tower fan.
The invention also constructs an energy efficiency optimization-based disturbance-rejection type central air conditioner cooling tower regulation and control system, which comprises:
the adding and subtracting unit is used for operating the cooling towers according to an adding and subtracting strategy and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
the minimum value running unit is used for judging whether the current frequency of the cooling tower fan reaches a lower limit value when the minimum value is reached, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
the maximum value operation unit is used for judging whether the current frequency of the cooling tower fan reaches an upper limit value when the maximum value is reached, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
and the frequency modulation unit is used for performing PID (proportion integration differentiation) adjustment on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature in a first preset period.
By implementing the invention, the following beneficial effects are achieved:
the invention discloses an energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method, which comprises the steps of operating a cooling tower according to an add-subtract machine and a frequency modulation strategy, judging whether the cooling tower currently operated reaches a heat dissipation capacity limit, namely whether the cooling tower reaches the maximum heat dissipation capacity or the minimum heat dissipation capacity, respectively carrying out fine adjustment on the frequency of a cooling tower fan to obtain the water outlet temperature of the cooling tower after frequency modulation, judging whether the water outlet temperature change of the cooling tower meets preset conditions, further obtaining a new water outlet temperature set value, and carrying out temperature control according to the new water outlet temperature set value in preset time. By implementing the invention, the immunity of the cooling tower control system can be enhanced, and the phenomenon that the cooling water control system is influenced due to abnormal interference of the outdoor temperature and humidity sensor detection data on wet bulb temperature calculation, so that the cooling tower is excessively put into or insufficient in heat dissipation is avoided, thereby reducing the energy efficiency of the system and the service life of equipment.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart of an energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower regulation and control method;
FIG. 2 is a schematic flow diagram of the overall cycle of the present invention;
FIG. 3 is a block diagram of a system for regulating and controlling an anti-interference central air conditioning cooling tower based on energy efficiency optimization.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
It should be noted that the flow diagrams depicted in the figures are merely exemplary and do not necessarily include all of the elements and operations/steps, nor are they necessarily performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
In this embodiment, as shown in fig. 1, the invention provides an energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control method, which is an integral circulation algorithm, and before the circulation method, the method comprises the steps of inputting operation data, obtaining relevant data required by control through operation, wherein the part of data is used for carrying out data support for the next circulation. Acquiring outdoor temperature and humidity data by an outdoor temperature and humidity sensor, and calculating according to the outdoor temperature and humidity data to acquire outdoor wet bulb temperature data; the cooling tower water inlet temperature sensor and the cooling tower water outlet temperature sensor acquire cooling tower water inlet temperature and water outlet temperature data; the operating frequency of the cooling tower fan frequency converter obtains the operating rotating speed data of the cooling tower fan. The method comprises the following steps:
step S10: operating the cooling towers according to an add-subtract machine strategy, and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
in this embodiment, the add-subtract policy includes:
initially, a single frequency lower limit operates;
if the water outlet temperature of the cooling tower is higher than a set value, adding the machine, wherein the frequency is still in the lower limit operation, and if the water outlet temperature of the cooling tower is always higher than the set value, adding the machine to the upper limit number;
if the outlet water temperature of the cooling tower is still higher than the set value, frequency adjustment is carried out through PID;
when the frequency reaches the upper limit number and is regulated to the lower limit operation, if the outlet water temperature of the cooling tower is lower than a set value, a cooling tower fan is reduced, and if the outlet water temperature of the cooling tower is always lower than the set value, the machine is continuously reduced until the minimum number of operation is reached.
As shown in fig. 2, in the present embodiment, step S10 includes:
step S11, operating a cooling tower according to an add-subtract machine strategy;
step S12, judging whether the number of the cooling towers running at present reaches a minimum value, if so, executing step S20; if not, executing step S13;
step S13, judging whether the number of the cooling towers running at present reaches the maximum value, if so, executing step S30; if not, step S11 is performed.
Step S20: when the minimum value is reached, judging whether the current frequency of the cooling tower fan reaches a lower limit value, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
in this embodiment, determining whether the current frequency of the cooling tower fan reaches the lower limit value, if so, raising the current frequency according to a preset frequency step includes:
judging whether the current frequency of the cooling tower fan reaches a lower limit value;
if not, further returning to the execution step S12; if yes, judging whether the current outlet water temperature of the cooling tower is greater than the early warning set temperature;
if not, judging whether the current frequency of the cooling tower fan reaches the lower limit value again; if yes, the current frequency is increased according to a preset frequency step.
In this embodiment, the current outlet water temperature of the cooling tower is obtained in the frequency raising process, and whether the outlet water temperature of the cooling tower meets the first preset condition is determined, if yes, the current outlet water temperature set value is calculated according to the current outlet water temperature, including:
and delaying a second time after each frequency rising in the frequency rising process to acquire the current water outlet temperature of the cooling tower, judging whether the current change rate of the water outlet temperature of the cooling tower is smaller than a first preset value, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature.
In this embodiment, determining whether the outlet water temperature of the cooling tower meets the first preset condition further includes:
if not, judging whether the current frequency of the cooling tower fan does not reach the upper limit value and whether the number of the cooling towers running at present does not reach the maximum value, if so, raising the current frequency according to a preset frequency step; if not, calculating the current water outlet temperature set value according to the current water outlet temperature.
In one embodiment, when the number of cooling towers currently running is judged to reach the minimum value, and the current frequency of the cooling tower fans reaches the lower limit value of the cooling tower with the change of the host load rate and the current water outlet temperature of the cooling tower is larger than the pre-warning set temperature, after the cooling tower fans are subjected to frequency rising for 120 seconds, the current water outlet temperature of the cooling tower is obtained, the current water outlet temperature is compared with the previous water outlet temperature of the cooling tower fans before frequency rising, whether the water outlet temperature change rate of the cooling tower is smaller than 0.1 ℃/min is judged, if the frequency of one cooling tower is increased to the upper frequency limit, the water outlet temperature change rate of the cooling tower is still larger than 0.1 ℃/min, one cooling tower is added at the moment, and the cooling tower fans are again subjected to frequency rising from the lowest frequency so as to circularly adjust. The range from the lowest frequency operation of 1 cooling tower fan to the maximum corresponding number of cooling tower fans of the cooling water main machine operation number is the upper frequency operation limit of the cooling tower fans. And in the adjusting range, the temperature change rate of the cooling tower outlet water is less than 0.1 ℃/min from low to high, and the cooling tower outlet water temperature is recorded. The outlet water temperature of the cooling tower is used as a current outlet water temperature set value and is used as a cooling tower PID frequency adjusting and cooling tower traditional group control basis within approximately 1.5 hours.
Step S30: when the maximum value is reached, judging whether the current frequency of the cooling tower fan reaches an upper limit value, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
in this embodiment, when it is determined that the number of cooling towers currently running reaches the maximum value, PID adjustment is further performed to adjust the current frequency of the cooling tower fan. When the circulation starts to operate, when the maximum number of operation is reached but the maximum frequency upper limit value is not reached, the water outlet temperature set value is obtained through wet bulb temperature calculation, the set value of the cooling tower fan adjusting PID operation is obtained according to the current water outlet temperature set value calculation, the set value of the current water outlet temperature and the set value of the PID operation obtained according to the cooling tower water outlet temperature sensor are combined, PID operation is carried out to obtain the adjusting value of the rotating speed of the cooling tower fan, and then the current frequency of the cooling tower fan is adjusted. And in the subsequent cycle, the current frequency of the cooling tower fan is PID regulated according to the outlet water temperature set value and the current outlet water temperature obtained in the previous cycle.
Acquiring the current water outlet temperature of the cooling tower in the frequency reducing process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, if so, calculating a current water outlet temperature set value according to the current water outlet temperature, wherein the method comprises the following steps of:
and delaying for a third time after each frequency reduction in the frequency reduction process to acquire the current outlet water temperature of the cooling tower, judging whether the current variation of the outlet water temperature of the cooling tower is larger than a second preset value, and if so, calculating a current outlet water temperature set value according to the difference value of the current outlet water temperature and the current variation of the temperature.
Judging that the current variation of the outlet water temperature of the cooling tower is larger than a second preset value, and then further comprising:
if not, judging whether the current frequency of the cooling tower fan reaches the lower limit value, if so, reducing the current frequency according to a preset frequency step; if not, the current outlet water temperature set value is calculated according to the difference value of the current outlet water temperature and the current temperature change quantity.
In this embodiment, when it is determined that the number of cooling towers currently running reaches a maximum value, and the current frequency of the cooling tower fans is subjected to PID adjustment, whether the current frequency of the cooling tower fans is greater than or equal to 50Hz is determined, and when it is determined that the current frequency of the cooling tower fans is less than 50Hz, PID adjustment is continued until the current frequency of the cooling tower fans is greater than or equal to 50Hz; when judging to be equal to or greater than 50Hz, carrying out frequency reduction for 5Hz for 120 seconds on the current frequency, obtaining the current outlet water temperature of the cooling tower, comparing the current outlet water temperature with the previous outlet water temperature of the cooling tower fan before frequency reduction, judging whether the outlet water temperature variation of the cooling tower is greater than 0.1 ℃, if so, calculating the current outlet water temperature set value according to the difference value of the current outlet water temperature and the current temperature variation; if not, judging whether the current frequency of the cooling tower fan reaches more than the lower limit value, if so, repeating the steps of frequency reduction and 5Hz time delay for 120 seconds and subsequent steps, if not, directly calculating the current outlet water temperature set value according to the difference value of the current outlet water temperature and the current temperature change, and performing PID (proportion integration differentiation) as the PID frequency modulation of the cooling tower and the traditional group control basis of the cooling tower within approximately 1.5 hours.
Step S40: and in a first preset period, PID adjustment is carried out on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature.
In the present embodiment, step S40 includes:
the method comprises the steps of carrying out frequency adjustment on a cooling tower fan according to a current outlet water temperature set value, starting timing on first time, and judging whether the first time arrives or not:
if the current outlet water temperature value is not reached, the current frequency of the cooling tower fan is regulated by PID according to the current outlet water temperature set value and the current outlet water temperature;
if the temperature reaches the preset value, calculating a temperature set value according to the wet bulb temperature, and performing PID (proportion integration differentiation) on the current frequency of the cooling tower fan according to the temperature set value and the current outlet water temperature.
In this embodiment, performing PID adjustment on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature includes:
and calculating according to the current outlet water temperature set value to obtain a set value of PID operation for regulating the cooling tower fan, and combining the current outlet water temperature obtained according to the cooling tower outlet water temperature sensor and the set value of PID operation to obtain a regulating value of the rotating speed of the cooling tower fan by PID operation, so as to regulate the current frequency of the cooling tower fan.
In this embodiment, after the outlet water temperature set value is obtained through calculation, the cooling tower fan is subjected to frequency adjustment according to the outlet water temperature set value, the cooling tower fan starts to operate for 1.5h in a timing mode, whether the operation time reaches 1.5h is judged, if yes, the circulation is ended, calculation according to an outdoor temperature sensor is restarted to obtain required operation data, an adder-subtractor strategy is performed, when the number of cooling towers currently operated is judged to reach the maximum value, the temperature set value is calculated according to the wet bulb temperature, and the current frequency of the cooling tower fan is regulated by PID according to the temperature set value and the current outlet water temperature; if not, setting the outlet water temperature as an outlet water temperature set value, performing PID (proportion integration differentiation) to regulate the current frequency of the cooling tower fan, continuously circulating, simultaneously executing an add-subtract strategy, judging whether the number of the cooling towers running at present reaches the minimum value or the maximum value again, and executing the subsequent steps.
In this embodiment, as shown in fig. 3, the present invention further constructs an energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower regulation and control system, which includes:
the adding and subtracting unit is used for operating the cooling towers according to an adding and subtracting strategy and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
the minimum value running unit is used for judging whether the current frequency of the cooling tower fan reaches a lower limit value when the minimum value is reached, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
the maximum value operation unit is used for judging whether the current frequency of the cooling tower fan reaches an upper limit value when the maximum value is reached, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
and the frequency modulation unit is used for performing PID (proportion integration differentiation) adjustment on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature in a first preset period.
Specifically, the specific coordination operation process between each module in the energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control system can be specifically referred to the energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method, and details are not repeated here.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
By implementing the invention, the following beneficial effects are achieved:
the invention discloses an energy efficiency optimization-based anti-interference type central air conditioner cooling tower regulation and control method, which comprises the steps of operating a cooling tower according to an add-subtract machine and a frequency modulation strategy, judging whether the cooling tower currently operated reaches a heat dissipation capacity limit, namely whether the cooling tower reaches the maximum heat dissipation capacity or the minimum heat dissipation capacity, respectively carrying out fine adjustment on the frequency of a cooling tower fan to obtain the water outlet temperature of the cooling tower after frequency modulation, judging whether the water outlet temperature change of the cooling tower meets preset conditions, further obtaining a new water outlet temperature set value, and carrying out temperature control according to the new water outlet temperature set value in preset time. By implementing the invention, the immunity of the cooling tower control system can be enhanced, and the phenomenon that the cooling water control system is influenced due to abnormal interference of the outdoor temperature and humidity sensor detection data on wet bulb temperature calculation, so that the cooling tower is excessively put into or insufficient in heat dissipation is avoided, thereby reducing the energy efficiency of the system and the service life of equipment.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (10)
1. An energy efficiency optimization-based anti-interference central air conditioner cooling tower regulation and control method is characterized by comprising the following steps of:
step S10: operating the cooling towers according to an add-subtract machine strategy, and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
step S20: when the minimum value is reached, judging whether the current frequency of the cooling tower fan reaches a lower limit value, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
step S30: when the maximum value is reached, judging whether the current frequency of the cooling tower fan reaches an upper limit value, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
step S40: and in a first preset period, PID adjustment is carried out on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature.
2. The energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower regulation and control method according to claim 1, wherein the step S10 includes:
step S11, operating a cooling tower according to an add-subtract machine strategy;
step S12, judging whether the number of the cooling towers running at present reaches a minimum value, if so, executing step S20; if not, executing step S13;
step S13, judging whether the number of the cooling towers running at present reaches the maximum value, if so, executing step S30; if not, step S11 is performed.
3. The energy efficiency optimization-based anti-interference central air conditioner cooling tower regulation and control method according to claim 1, wherein the determining whether the current frequency of the cooling tower fan reaches the lower limit value, if so, the raising the current frequency according to the preset frequency step comprises:
judging whether the current frequency of the cooling tower fan reaches the lower limit value;
if yes, judging whether the current outlet water temperature of the cooling tower is greater than the early warning set temperature;
if yes, the current frequency is increased according to a preset frequency step.
4. The energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control method according to claim 1, wherein the step of obtaining the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, if yes, calculating a current water outlet temperature set value according to the current water outlet temperature, and comprises the following steps:
and delaying for a second time after each frequency rising in the frequency rising process to acquire the current outlet water temperature of the cooling tower fan, judging whether the current change rate of the outlet water temperature of the cooling tower is smaller than a first preset value, and if so, calculating a current outlet water temperature set value according to the current outlet water temperature.
5. The energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower regulation and control method according to claim 1, wherein the determining whether the outlet water temperature of the cooling tower meets the first preset condition further comprises:
if not, judging whether the current frequency of the cooling tower fan does not reach the upper limit value and whether the number of the cooling towers running at present does not reach the maximum value, if so, raising the current frequency according to a preset frequency step; if not, calculating the current water outlet temperature set value according to the current water outlet temperature.
6. The energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control method according to claim 1, wherein the step of obtaining the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, if yes, calculating a current water outlet temperature set value according to the current water outlet temperature, and comprises the following steps:
and delaying for a third time after each frequency reduction in the frequency reduction process to acquire the current outlet water temperature of the cooling tower, judging that the current variation of the outlet water temperature of the cooling tower is larger than a second preset value, and if yes, calculating a current outlet water temperature set value according to the difference value of the current outlet water temperature and the current variation of the temperature.
7. The energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower regulation and control method according to claim 1, wherein the determining that the current variation of the outlet water temperature of the cooling tower is greater than a second preset value further comprises:
if not, judging whether the current frequency of the cooling tower fan reaches the lower limit value, if so, reducing the current frequency according to a preset frequency step; if not, the current outlet water temperature set value is calculated according to the difference value of the current outlet water temperature and the current temperature change quantity.
8. The energy efficiency optimization-based disturbance rejection type central air conditioning cooling tower control method according to claim 1, wherein the step S40 comprises:
the method comprises the steps of carrying out frequency adjustment on a cooling tower fan according to a current outlet water temperature set value, starting timing on first time, and judging whether the first time arrives or not:
if the current outlet water temperature value is not reached, the current frequency of the cooling tower fan is regulated by PID according to the current outlet water temperature set value and the current outlet water temperature;
if the temperature reaches the preset value, calculating a temperature set value according to the wet bulb temperature, and performing PID (proportion integration differentiation) adjustment on the current frequency of the cooling tower fan according to the temperature set value and the current outlet water temperature.
9. The energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control method according to claim 8, wherein the performing PID (proportion integration differentiation) regulation on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature comprises:
and calculating according to the current outlet water temperature set value to obtain a set value of PID operation for regulating the cooling tower fan, and carrying out PID operation according to the current outlet water temperature obtained by the cooling tower outlet water temperature sensor and the set value of PID operation to obtain a regulating value of the cooling tower fan frequency so as to regulate the current frequency of the cooling tower fan.
10. An energy efficiency optimization-based disturbance rejection type central air conditioner cooling tower regulation and control system is characterized by comprising:
the adding and subtracting unit is used for operating the cooling towers according to an adding and subtracting strategy and judging whether the number of the cooling towers currently operated reaches a minimum value or a maximum value;
the minimum value running unit is used for judging whether the current frequency of the cooling tower fan reaches a lower limit value when the minimum value is reached, if so, carrying out frequency raising on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency raising process, judging whether the water outlet temperature of the cooling tower meets a first preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
the maximum value operation unit is used for judging whether the current frequency of the cooling tower fan reaches an upper limit value when the maximum value is reached, if so, carrying out frequency reduction on the current frequency according to a preset frequency step, acquiring the current water outlet temperature of the cooling tower in the frequency reduction process, judging whether the water outlet temperature of the cooling tower meets a second preset condition, and if so, calculating a current water outlet temperature set value according to the current water outlet temperature;
and the frequency modulation unit is used for performing PID (proportion integration differentiation) adjustment on the current frequency of the cooling tower fan according to the current outlet water temperature set value and the current outlet water temperature in a first preset period.
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