CN113606757A - Fan control method for full-direct-current variable-frequency air-cooling module machine - Google Patents

Fan control method for full-direct-current variable-frequency air-cooling module machine Download PDF

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CN113606757A
CN113606757A CN202110593439.XA CN202110593439A CN113606757A CN 113606757 A CN113606757 A CN 113606757A CN 202110593439 A CN202110593439 A CN 202110593439A CN 113606757 A CN113606757 A CN 113606757A
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temperature
fan
temperature difference
direct
ring
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CN113606757B (en
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韩鑫
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Vick Jiangsu Environmental Equipment Co ltd
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Weike Tianjin Co ltd
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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
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Human Computer Interaction (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a fan control method of a full-direct-current variable-frequency air-cooling module machine, which is characterized in that the ambient temperature is divided into a plurality of sections of continuous temperature intervals, each section of temperature interval is correspondingly provided with a target cold ring temperature difference in a refrigeration mode, and each section of temperature interval is correspondingly provided with a target steaming temperature difference in a heating mode; each target cold ring temperature difference or each target ring evaporation temperature difference is correspondingly provided with a dead zone deviation; calculating a deviation value of the actual cooling ring temperature difference and the target cooling ring temperature difference or a deviation value of the actual circulating evaporation temperature difference and the target circulating evaporation temperature difference; and carrying out corresponding PID control on each section of temperature interval based on the comparison result of the deviation value and the dead zone deviation. The fan control method of the full-direct-current variable-frequency air-cooling module machine can continuously and steplessly adjust the air quantity of the machine set according to the high and low pressure and environmental temperature change conditions of the system, realize the rapid and accurate control of the output rotating speed of the fan and prevent the unstable operation of the system caused by the sudden change of the air quantity.

Description

Fan control method for full-direct-current variable-frequency air-cooling module machine
Technical Field
The invention belongs to the field of air conditioner control, and particularly relates to a fan control method of a full-direct-current variable-frequency air-cooling module machine.
Background
In the existing full-direct-current variable-frequency air-cooling module unit, the air quantity of the unit cannot be continuously and steplessly adjusted according to the high and low pressure and environment temperature change conditions of the system, the output rotating speed of the fan cannot be rapidly and accurately controlled, unnecessary electric power waste can be caused, and the unit is not environment-friendly.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling a fan of a full dc frequency conversion air-cooled modular machine, so as to solve the above-mentioned disadvantages.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fan control method for a full-direct-current variable-frequency air-cooling module machine divides the ambient temperature into a plurality of sections of continuous temperature intervals, each section of temperature interval is correspondingly provided with a target cold ring temperature difference in a refrigeration mode, and each section of temperature interval is correspondingly provided with a target steaming temperature difference in a heating mode;
each target cold ring temperature difference or each target ring evaporation temperature difference is correspondingly provided with a dead zone deviation;
calculating a deviation value of the actual cooling ring temperature difference and the target cooling ring temperature difference or a deviation value of the actual circulating evaporation temperature difference and the target circulating evaporation temperature difference;
and carrying out corresponding PID control on each section of temperature interval based on the comparison result of the deviation value and the dead zone deviation.
Further, the control method in the cooling mode specifically includes the following steps:
(11) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(12) Setting a refrigeration mode and giving a starting command;
(13) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial starting rotating speed n of the direct current variable frequency fancAnd initial opening holding time Tc；
(14) Initial opening holding time TcAfter the end, the current ambient temperature T is detected againO2Value and system condensing temperature TcValue, calculating actual coldRing temperature difference delta TC；
(15) According to the current ambient temperature TO2Determining target cold ring temperature difference delta T in the environment temperature intervalC-setDeviation from corresponding cooling dead zone Δ EC-set；
(16) Calculating a deviation value e based on the actual cold ring temperature difference and the target cold ring temperature difference, wherein the deviation value e is equal to the actual cold ring temperature difference delta TCTarget cold ring temperature difference Δ TC-setThe deviation value E and the refrigeration dead zone deviation delta EC-setAnd comparing, and entering PID closed-loop control of a corresponding temperature interval.
Further, the control method in the heating mode specifically includes the following steps:
(21) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(22) Setting a heating mode and giving a starting command;
(23) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial opening speed n of the direct current variable frequency fancAnd initial opening holding time TH；
(24) Initial opening holding time THAfter the end, the current ambient temperature T is detected againO2And the evaporation temperature T of the systemECalculating the actual temperature difference delta T of the ring evaporationH；
(25) According to the current ambient temperature TO2Confirming target ring evaporation temperature difference delta T in the sectionH-setDeviation Delta E from corresponding heating dead zoneH-set；
(26) Calculating a deviation value e based on the actual ring evaporation temperature difference and the target ring evaporation temperature difference, wherein the deviation value e is equal to the actual ring evaporation temperature difference delta THTarget ring-evaporation temperature difference Δ TH-setThe deviation value E is deviated from the heating dead zone by delta EH-setAnd comparing, and entering PID closed-loop control of a corresponding temperature interval.
Further, the initial opening speed n of the direct current variable frequency fan in the refrigeration modecCalculating the formula:
Figure BDA0003090072200000021
wherein alpha isC、βCCalculating a parameter, gamma, for the initial fan speed of the refrigeration operationCCorrection factor of initial opening speed of fan, gamma, for refrigerating operationCIs set according to different ring temperature intervals, NminThe lowest allowed rotation speed of the DC variable frequency fan, calculated nCSatisfies the condition nC≥NmaxThen n isCTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in refrigeration modecCalculating the formula:
Figure BDA0003090072200000031
wherein T isaCInitial reference ambient temperature, t, for refrigerationminThe minimum wind speed maintaining time, lambda, of the starting process of the direct-current variable-frequency fanCMaintaining a correction factor, λ, for initial start-up of the fan for refrigeration operationCAnd setting parameters according to different ring temperature intervals.
Initial opening speed n of direct-current variable-frequency fan in heating modecCalculating the formula:
Figure BDA0003090072200000032
wherein alpha isH、βHCalculating a parameter, gamma, for the initial fan speed of heating operationHCorrection factor of initial opening speed of fan for heating operation, gammaHIs set according to different ring temperature intervals, NminAllowing the lowest rotation speed of the direct current variable frequency fan, and calculating n through a formulaH≥NmaxThen n isHTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in heating modeHCalculating the formula:
Figure BDA0003090072200000033
wherein T isaHInitial reference ambient temperature, t, for heatingminMaintaining the minimum wind speed maintaining time lambda of the direct current variable frequency fan in the starting processHMaintaining correction factor, lambda, for initial startup of fan for heating operationHAnd setting parameters according to different ring temperature intervals.
Further, after the refrigeration mode or the heating mode enters PID closed-loop control, PID control is calculated once every sampling period tau time, and the rotating speed of the EC fan is regulated once every action period theta time;
the sampling period tau and the action period theta are both set values inside the program.
Further, the control method for entering the defrosting mode in the heating mode specifically includes:
based on the current ambient temperature TO2Value and system evaporating temperature TEJudging whether the defrosting condition is met or not;
when the defrosting condition is met, the unit enters a defrosting mode, the direct-current variable-frequency fan quits PID control and stops running, and when the unit meets the defrosting condition, the direct-current variable-frequency fan advances thIs turned on and at a maximum speed NmaxRun for a duration of tdhThen, the PID control is performed again in step (24).
Compared with the prior art, the fan control method of the full-direct-current variable-frequency air-cooling module machine has the following advantages:
according to the fan control method of the full-direct-current variable-frequency air-cooled module machine, the air quantity of the machine set can be continuously and steplessly regulated according to the high-low pressure and environment temperature change conditions of the system, on one hand, the output rotating speed of the fan can be rapidly and accurately controlled, the condition that the system is unstable due to sudden change of the air quantity is prevented, on the other hand, the air quantity output of the direct-current variable-frequency fan is comprehensively controlled by comprehensively considering the self operating parameters of the system and combining the design parameters of a heat exchanger and the influence of environment temperature, and the condition that the machine set can realize the closed-loop stable and efficient operation of the direct-current variable-frequency fan under different working conditions is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram illustrating a control flow of a direct-current variable frequency fan in a unit refrigeration operation process according to an embodiment of the invention;
fig. 2 is a schematic diagram of a control flow of a direct-current variable-frequency fan in a unit heating operation process according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a target ring cold temperature difference setting at different ring temperatures according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating control dead band offset settings at different loop temperatures according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a target steaming temperature difference setting at different ring temperatures according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating control dead band offset settings at different loop temperatures according to an embodiment of the present invention;
FIG. 7 is a schematic view of a PID control flow of a direct current variable frequency fan for refrigeration operation according to an embodiment of the invention;
fig. 8 is a schematic diagram of a PID control flow of the direct-current variable-frequency fan for heating operation according to the embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 8, a fan control method for a full-dc frequency conversion air-cooling module machine divides an ambient temperature into a plurality of continuous temperature intervals, wherein each temperature interval is correspondingly provided with a target cold-ring temperature difference in a refrigeration mode, and each temperature interval is correspondingly provided with a target steaming temperature difference in a heating mode;
each target cold ring temperature difference or each target ring evaporation temperature difference is correspondingly provided with a dead zone deviation;
calculating a deviation value of the actual cooling ring temperature difference and the target cooling ring temperature difference or a deviation value of the actual circulating evaporation temperature difference and the target circulating evaporation temperature difference;
and carrying out corresponding PID control on each section of temperature interval based on the comparison result of the deviation value and the dead zone deviation.
The control method in the refrigeration mode specifically comprises the following steps:
(11) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(12) Setting a refrigeration mode and giving a starting command;
(13) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial starting rotating speed n of the direct current variable frequency fancAnd initial opening holding time Tc；
(14) Initial opening holding time TcAfter the end, the current ambient temperature T is detected againO2Value and system condensing temperature TcValue, calculating the actual cold ring temperature difference Δ TC；
(15) According to the current ambient temperature TO2Determining target cold ring temperature difference delta T in the environment temperature intervalC-setDeviation from corresponding cooling dead zone Δ EC-set；
(16) Calculating a deviation value e based on the actual cold ring temperature difference and the target cold ring temperature difference, wherein the deviation value e is equal to the actual cold ring temperature difference delta TCTarget cold ring temperature difference Δ TC-setThe deviation value E and the refrigeration dead zone deviation delta EC-setComparing, and entering PID closed-loop control of a corresponding temperature interval;
when the full direct current frequency conversion air cooling module unit operates in a refrigerating mode, the ambient temperature T is firstly detected in a power-on standby mode of the unitOAnd the system inlet water temperature TinWhen a starting command is received, the air-conditioning water pump is started, and after water flow detection, the direct-current variable-frequency fan is started, and at the moment, the fan is started at the initial starting rotating speed n according to refrigerationC(TO Tin) Operation, after a cooling initial start maintenance time tC(TO) After (wherein the refrigeration is initially turned on at a speed n)CIs the ambient temperature TOAnd the system inlet water temperature TinIs expressed as nC＝nC(TOTin) (ii) a Refrigerating operation opening maintaining time tCIs the ambient temperature TOIs expressed as tC＝tC(TO))
The following closed-loop control is performed: start detection of the system condensation temperature TCWhile the ambient temperature T is detected againOFirstly, the target cold ring temperature difference delta T is determined according to the interval of the environment temperature at the momentC-setDifferent purposes under different environmental temperature rangesTemperature difference delta T of standard cooling ringC-set，
Examples are: dividing into 3 regions according to the ring temperature when the environment temperature TOThe conditions are satisfied: t isO≤TCLAt this time, the temperature difference of the target cold ring is delta TC-set1(ii) a When T isCL＜TO≤TCHAt this time, the temperature difference of the target cold ring is delta TC-set2(ii) a When T isO＞TCHAt this time, the temperature difference of the target cold ring is delta TC-set3(Note: this is by way of example only, and the invention is not limited to this environment temperature region)
In order to prevent the frequent adjustment of the rotating speed of the direct-current variable-frequency fan, the dead zone control deviation is correspondingly set on the basis of the set target cold ring temperature difference:
aiming at target cold ring temperature difference delta TC-set1Setting dead band offset Δ EC-set1Target cold ring temperature differential Δ TC-set2Setting dead band offset Δ EC-set2Target cold ring temperature differential Δ TC-set3Setting dead band offset Δ EC-set3(Note: control dead band offset Δ EC-setNot limited to the above 3 types, corresponding to the target cold ring temperature difference in different environmental temperature intervals, which are only examples
I.e. when the actual cold ring temperature difference deltatCThe conditions are satisfied: delta TC∈(ΔTC-set1-ΔEC-set1， ΔTC-set1+ΔEC-set1) Or Δ TC∈(ΔTC-set2-ΔEC-set2，ΔTC-set2+ΔEC-set2) Or Δ TC∈ (ΔTC-set3-ΔEC-set3，ΔTC-set3+ΔEC-set3) The time direct current frequency conversion fan keeps the current rotating speed without regulation
Meanwhile, the variation deviation delta T of the temperature maintaining area of the refrigeration environment needs to be setOC(ΔTOCGreater than 0) is adopted, and the temperature T is measured when the unit is in the operating processOFrom the satisfaction of the condition TO≤TCLRising to satisfy the condition: t isCH＞TO≥TCLThen the temperature difference of the target cold ring is from delta TC-set1Becomes Δ TC-set2When the ambient temperature continues to rise, the condition T is satisfiedO≥TCHThen the targetTemperature difference of cold ring from delta TC-set2Becomes Δ TC-set3；
When the ambient temperature TOFrom TO＞TCHRegion reduction to TCL＜TO≤TCH-ΔTOCThe temperature difference of the target cold ring is from delta T in the regionC-set3Becomes Δ TC-set2When the ambient temperature is from the region TCL＜TO≤TCHDown to TO≤TCL-ΔTOCTime target cold ring temperature difference from delta TC-set2Becomes Δ TC-set1Secondly, calculating the current actual cold ring temperature difference delta TCCurrent system condensing temperature TCCurrent ambient temperature TOAnd calculating the deviation value e of the cold ring temperature difference as the actual cold ring temperature difference delta TCTarget cold ring temperature difference Δ TC-set，
Performing PID calculation according to the deviation value e of the current cold ring temperature difference, and when e meets the condition: e is E (-Delta E)C-set1， ΔEC-set1) Or E (- Δ E)C-set2，ΔEC-set2) Or E (- Δ E)C-set3，ΔEC-set3) Then entering the PID control dead zone while the PID output remains unchanged (note: when Δ EC-set1、ΔEC-set2、ΔEC-set3And when the value is 0, the control mode is changed into the control mode without dead zone deviation).
The control method under the heating mode specifically comprises the following steps:
(21) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(22) Setting a heating mode and giving a starting command;
(23) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial opening speed n of the direct current variable frequency fancAnd initial opening holding time TH；
(24) Initial opening holding time THAfter the end, the current ambient temperature T is detected againO2And the evaporation temperature T of the systemECalculating the actual temperature difference delta T of the ring evaporationH；
(25) According to the current ringAmbient temperature TO2Confirming target ring evaporation temperature difference delta T in the sectionH-setDeviation Delta E from corresponding heating dead zoneH-set；
(26) Calculating a deviation value e based on the actual ring evaporation temperature difference and the target ring evaporation temperature difference, wherein the deviation value e is equal to the actual ring evaporation temperature difference delta THTarget ring-evaporation temperature difference Δ TH-setThe deviation value E is deviated from the heating dead zone by delta EH-setComparing, and entering PID closed-loop control of a corresponding temperature interval;
when the full direct current frequency conversion air-cooled module unit is in heating operation, the standby machine on the unit detects the ambient temperature TOAnd the system inlet water temperature TinWhen a starting command is received, the air-conditioning water pump is started, and after water flow detection, the direct-current variable-frequency fan is started, and at the moment, the fan is started at the initial heating starting rotating speed nH(TO Tin) Operation, after a heating initial start maintaining time tH(TO) After (wherein the heating is started at an initial speed nHIs the ambient temperature TOAnd the system inlet water temperature TinIs expressed as nH＝nH(TO Tin) (ii) a Heating operation starting maintenance time tHIs the ambient temperature TOIs expressed as tH＝tH(TO) The following closed-loop control is performed: at this point, the evaporation temperature T of the system begins to be detectedEWhile the ambient temperature T is detected againOFirstly, the target circulating temperature difference delta T is determined according to the interval of the environment temperature at the momentE-setDifferent target circulating temperature difference delta T under different environmental temperature intervalsE-setFor example: as shown in fig. 5, the temperature is divided into 3 zones according to the ambient temperature TOThe conditions are satisfied: t isO≤THLAt this time, the target ring evaporation temperature difference is delta TH-set3(ii) a When T isHL＜ TO≤THHAt this time, the target ring evaporation temperature difference is delta TH-set2(ii) a When T isO＞THHAt this time, the target ring evaporation temperature difference is delta TH-set1(Note: this is by way of example only, and the present invention is not limited thereto), in order to prevent frequent adjustment of the rotational speed of the DC variable frequency fan, therefore, the above-set targetAnd setting corresponding control dead zone deviation on the basis of the circulating evaporation temperature difference: target-specific cyclic vaporization temperature difference delta TH-set3Setting dead band offset Δ EH-set3Target steaming temperature difference Δ TH-set2Setting dead band offset Δ EH-set2Target steaming temperature difference Δ TH-set1Setting dead band offset Δ EH-set1(Note: control dead band offset Δ EH-setNot limited to the above 3, the target cold ring temperature differences in different environmental temperature ranges are in one-to-one correspondence, which is only exemplified above)
That is, when the actual temperature difference Δ T of the ring evaporationHThe conditions are satisfied: delta TH∈(ΔTH-set1-ΔEH-set1， ΔTH-set1+ΔEH-set1) Or Δ TH∈(ΔTH-set2-ΔEH-set2，ΔTH-set2+ΔEH-set2) Or Δ TH∈ (ΔTH-set3-ΔEH-set3，ΔTH-set3+ΔEH-set3) The direct current variable frequency fan keeps the current rotating speed without regulation,
meanwhile, the variation deviation delta T of the temperature maintaining area of the heating operation environment needs to be setOH(ΔTOHGreater than 0) is adopted, and the temperature T is measured when the unit is in the operating processOFrom the satisfaction of the condition TO≤THLRising to satisfy the condition: t isHH＞ TO≥THL+ΔTOHThe target ring evaporation temperature difference is from delta TH-set3Becomes Δ TH-set2When the ambient temperature continues to rise, the condition T is satisfiedO≥THH+ΔTOHThe target ring-evaporation temperature difference is from Δ TH-set2Becomes Δ TH-set1(ii) a When the ambient temperature TOFrom TO＞THHRegion reduction to THL＜TO≤THHIn the region, the target ring evaporation temperature difference is from delta TH-set1Becomes Δ TH-set2When the ambient temperature is from the region THL＜TO≤THHDown to TO≤THLTime target ring evaporation temperature difference from delta TH-set2Becomes Δ TH-set3As shown in particular in fig. 6.
Secondly, calculating the current actual circulating temperature difference delta TECurrent ambient temperature TOCurrent system steamingHair temperature TEAnd calculating the deviation value e of the ring evaporation temperature difference as the actual ring evaporation temperature difference delta TETarget cold ring temperature difference Δ TE-set，
Performing PID calculation according to the deviation value e of the current circulating temperature difference, and when e meets the condition: e is E (-Delta E)H-set3，ΔEH-set3) Or E (- Δ E)H-set2，ΔEH-set2) Or E (- Δ E)H-set1，ΔEH-set1) Then entering the PID control dead zone while the PID output remains unchanged (note: when Δ EH-set1、ΔEH-set2、ΔEH-set3When the value is 0, the control mode is changed into the control mode without dead zone deviation) the direct current frequency conversion fan keeps the current rotating speed,
when the system meets the defrosting condition, the direct current variable frequency fan exits PID control stop operation when entering the defrosting mode, and the direct current variable frequency fan advances t after meeting the defrosting conditionh(the defrosting fan is delayed) is started, and the direct current variable frequency fan rotates at the highest speed NmaxDuration of operation tdhAnd (running time after defrosting) and then entering PID closed-loop control again.
Initial opening speed n of direct current frequency conversion fan in refrigeration modecCalculating the formula:
Figure BDA0003090072200000101
wherein alpha isC、βCCalculating a parameter, gamma, for the initial fan speed of the refrigeration operationCCorrection factor of initial opening speed of fan, gamma, for refrigerating operationCIs set according to different ring temperature intervals, NminThe lowest allowed rotation speed of the DC variable frequency fan, calculated nCSatisfies the condition nC≥NmaxThen n isCTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in refrigeration modecCalculating the formula:
Figure BDA0003090072200000102
wherein T isaCInitial reference ambient temperature, t, for refrigerationminThe minimum wind speed maintaining time, lambda, of the starting process of the direct-current variable-frequency fanCMaintaining a correction factor, λ, for initial start-up of the fan for refrigeration operationCAnd setting parameters according to different ring temperature intervals.
Initial opening speed n of direct-current variable-frequency fan in heating modecCalculating the formula:
Figure BDA0003090072200000103
wherein alpha isH、βHCalculating a parameter, gamma, for the initial fan speed of heating operationHCorrection factor of initial opening speed of fan for heating operation, gammaHIs set according to different ring temperature intervals, NminAllowing the lowest rotation speed of the direct current variable frequency fan, and calculating n through a formulaH≥NmaxThen n isHTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in heating modeHCalculating the formula:
Figure BDA0003090072200000111
wherein T isaHInitial reference ambient temperature, t, for heatingminMaintaining the minimum wind speed maintaining time lambda of the direct current variable frequency fan in the starting processHMaintaining correction factor, lambda, for initial startup of fan for heating operationHAnd setting parameters according to different ring temperature intervals.
After the refrigeration mode or the heating mode enters PID closed-loop control, PID control is calculated once every sampling period tau time, and the rotating speed action of the EC fan is adjusted once every action period theta time;
the sampling period tau and the action period theta are both constant values.
The defrosting control method under the heating mode specifically comprises the following steps:
detecting ambient temperature TO2Value and system evaporating temperature TEA value corresponding to whether the system satisfies a defrost condition;
the direct current variable frequency fan exits PID control to stop running and enters a defrosting mode, and the direct current variable frequency fan rotates at the maximum speed NmaxAdvance ThOpening, and after defrosting, performing the step (4);
and if not, PID control calculation is carried out once every sampling period tau time, and the rotation speed of the EC fan is regulated once every action period theta time.
The specific implementation mode is as follows:
and (3) refrigerating operation:
the refrigeration operation mode is divided into three intervals according to the ambient temperature: t isCL＝24℃，TCH＝40℃， ΔTOC2K; the three ring temperature intervals respectively correspond to different target cold ring temperature differences: delta TC-set1＝18K， ΔTC-set2＝13K，ΔTC-set311K; the corresponding refrigeration dead zone deviations are respectively: delta EC-set1＝1K， ΔEC-set2＝2K，ΔEC-set3＝3K；
Initial opening speed calculation parameter alpha of refrigeration running fanC＝1.2，βC0.6; initial opening speed correction coefficient gamma of refrigeration running fanCThe parameters are respectively set as follows according to the three ring temperature intervals: 0.6, 1.0, 1.4; allowable lowest rotating speed N of direct-current variable-frequency fanminMaximum speed N allowed for 5rpsmax20rps, maintaining time t of minimum wind speed in starting process of direct current frequency conversion fanmin60 s; reference ambient temperature T for initial start of refrigerationaCSetting the temperature at 25 ℃; initial opening maintaining correction coefficient lambda of refrigeration running fanCSetting parameter values as follows according to the three ring temperature intervals: 1.4, 1.2,0.8.
When the full direct current frequency conversion air cooling module unit operates in a refrigerating mode, the ambient temperature T is firstly detected in a power-on standby mode of the unitO1And the system inlet water temperature TinIf the temperature T is detectedO135 deg.C of water entering the systeminAnd (3) calculating the initial starting rotating speed of the direct-current variable-frequency fan as follows:
Figure BDA0003090072200000121
the direct current variable frequency fan is rounded up to 7rps when the direct current variable frequency fan is initially started and the rotating speed is selected
Calculating the initial opening speed maintaining time of the direct current variable frequency fan as follows:
Figure BDA0003090072200000122
at the moment, the unit judges that the water temperature unit is in a loading area after receiving a starting command, firstly, a water pump is started, after water flow detection delay, the initial starting speed and the initial starting speed maintaining time of the direct-current variable-frequency fan are calculated according to the environment temperature and the system water inlet temperature, and then the direct-current variable-frequency fan is started according to the initial starting speed nCInitial start-up holding time t of operation at 7rpsCAfter 70s, the ring temperature and the condensation temperature are detected again, and if the ring temperature T is detectedO1The temperature is 34.5 ℃ within the ring temperature of 20-40 ℃, the refrigeration dead zone deviation delta E is corresponding to the target cold ring temperature difference delta TC-set2 being 13KC-set22K condensation temperature TCCalculating the current cold ring temperature difference delta T at 51.5 DEG CC＝TC-TO151.5-34.5 ═ 17K, the deviation value e of the cold ring temperature difference is ═ Delta TC-ΔTC-set2When the deviation value E of the cold ring temperature difference is 4K, the deviation value E of the cold ring temperature difference is 4K & gt delta EC-set22K, then the direct current frequency conversion fan carries out PID closed loop control, and it is respectively to establish the PID parameter: proportional parameter KP is 0.15, integral time TI150s, differential time TDThe sampling period tau is 0.5s, the action period theta is 3s, the time group main control board chip samples once every 0.5s to calculate the deviation value E of the cold ring temperature difference, the direct current frequency conversion fan rotating speed is adjusted once every 3s, and if the deviation value E of the cold ring temperature difference calculated by sampling at a certain time is 0.8K < delta EC-set2And 2K, entering a PID control dead zone at the moment, keeping the current rotating speed of the direct-current variable-frequency fan unchanged, and enabling the PID output rotating speed variation to be 0 rps.
When the environmental temperature changes, the temperature T of the environmentO2From 34.5 ℃ to 23.4 ℃, at which time the ring temperature TO2＝23.4℃＞TCL-ΔTOCWhen the temperature of the ring is 24-2 ℃ and 22 ℃, the target cold ring temperature difference is kept at 13K and is not changed, and when the ring temperature is continuously reduced, the condition T is metO＝21.8℃＜TCL-ΔTOCWhen the temperature is 24-2 ℃ and 22 ℃, the PID closed-loop control target cold loop temperature difference of the direct-current variable-frequency fan is changed from 13K to 18K, and at the moment, the main control board chip performs PID calculation according to the new target cold loop temperature difference to control the rotating speed of the direct-current variable-frequency fan; if the ambient temperature changes again from the current 21.8 ℃ to 25.7 ℃, then T is determined at the momentO＝25.7℃＞TCLWhen the loop temperature continuously rises from 25.7 ℃ TO 41.2 ℃, the TO is 41.2 ℃ and is higher than the TCH is 40 ℃, the target cold loop temperature difference is changed from 13K TO 11K, and the main control board chip performs PID calculation according TO the new target cold loop temperature difference.
Heating operation:
the heating operation mode is divided into three intervals according to the environment temperature: t isHL＝-15℃，THH＝-5℃， ΔTOH2K; the three ring temperature intervals respectively correspond to different target ring evaporation temperature differences: delta TH-set3＝5K，ΔTH-set2＝8K， ΔTH-set110K; the corresponding heating dead zone deviations are respectively as follows: delta EH-set3＝1K，ΔEH-set2＝1.5K， ΔEH-set12K; initial opening speed calculation parameter alpha of heating operation fanH＝1.5，βH0.8; initial opening speed correction coefficient gamma of fan in refrigeration operationHThe parameters are respectively set as follows according to the three ring temperature intervals: 1.8, 1.5, 1.2; allowable lowest rotating speed N of direct-current variable-frequency fanminMaximum speed N allowed for 5rpsmax20rps, maintaining time t of minimum wind speed in starting process of direct current frequency conversion fanmin60 s; heating initial reference environment temperature TaH-10 ℃ under vacuum; initial opening maintaining correction coefficient lambda of heating operation fanHSetting parameter values as follows according to the three ring temperature intervals: 0.8, 1.0, 1.2; heating defrosting fan-starting time delay tN＝60s；
When the full direct current frequency conversion air cooling module unit is used for heating, the ambient temperature T is firstly detected in the power-on standby mode of the unitO1And the system inlet water temperature TinIf the temperature T is detectedO1Temperature T of inlet water of system at-12 ℃inAnd when the temperature is 40 ℃, calculating the initial starting rotating speed of the direct-current variable-frequency fan as follows:
Figure BDA0003090072200000141
the initial starting rotation speed of the direct current variable frequency fan is selected and rounded up to 13rps
Calculating the initial opening speed maintaining time of the direct current variable frequency fan as follows:
Figure BDA0003090072200000142
at the moment, the unit judges that the water temperature is in a loading area after receiving a starting command, firstly, the water pump is started, after water flow detection delay, the initial starting rotating speed and the initial starting rotating speed maintaining time of the direct-current variable-frequency fan are calculated according to the environment temperature and the system water inlet temperature, and then the direct-current variable-frequency fan is started according to the initial starting rotating speed nHInitial start-up holding time t of 13rps operationHAfter 59.5s, the ring temperature and the evaporation temperature are detected again, and if the ring temperature T is detectedO2The temperature difference delta T of the target ring evaporation is within-15 ℃ to-5 ℃ of-11.5 DEG CH-set2Heating dead zone deviation Δ E of 8KH-set21.5K, evaporation temperature TEThe temperature difference delta T of the current ring steaming is calculated at-22.3 DEG CH＝TO2-TEWhen the actual temperature difference of the ring evaporation is 10.8K, the deviation value e of the actual temperature difference of the ring evaporation is delta TH-ΔTH-set2When 10.8K-8K is 2.8K, the deviation E of the ring temperature difference is 2.8K > Δ EH-set21.5K, then the direct current frequency conversion fan carries out PID closed loop control, and it is respectively to establish the PID parameter: proportional parameter KP is 0.15, integral time TI150s, differential time TDThe sampling period tau is 0.5s, the action period theta is 3s, and the time group main control board chip enters every 0.5sSampling once to calculate the deviation value E of the circulating temperature difference, adjusting the rotating speed of the direct-current variable-frequency fan once every 3s, and calculating the deviation value E of the circulating temperature difference as 1.1K < delta E if sampling at a certain timeH-set2And (5) when the rotating speed of the direct-current variable-frequency fan is 1.5K, entering a PID control dead zone, keeping the current rotating speed of the direct-current variable-frequency fan unchanged, and controlling the output rotating speed variable quantity to be 0rps by the PID.
When the environmental temperature changes, the temperature T of the environmentOThe temperature is increased from-11.5 ℃ to-4.2 ℃, and the ring temperature T is increasedO＝-4.2℃＜THH+ΔTOHWhen the temperature is higher than-5 deg.C and higher than-2 deg.C and higher than-3 deg.C, the target ring-steaming temperature difference is kept at 8K, and when the ring temperature continuously rises, the condition T is metO2＝-2.4℃＞THH+ΔTOHWhen the temperature is-5 ℃ and 2 ℃ and-3 ℃, the PID closed-loop control target circulating temperature difference of the direct-current frequency conversion fan is changed from current 8K to 10K, and at the moment, the main control board chip carries out PID calculation according to the new target circulating temperature difference so as to control the rotating speed of the direct-current frequency conversion fan; if the ambient temperature changes again from the current temperature of-2.4 ℃ to-5.2 ℃, then T is obtainedO＝-5.2℃＜THHWhen the target cyclic evaporation temperature difference is changed from 10K TO 8K, the main control board chip performs PID calculation according TO the new target cyclic evaporation temperature difference, and when the cyclic temperature is continuously reduced from 5.2 ℃ below zero TO 16.8 ℃, the TO is more than 16.8 ℃ below zero and T is less than TCHAnd at the moment, the target ring evaporation temperature difference is changed from current 8K to 5K, and at the moment, the main control board chip performs PID calculation according to the new target ring evaporation temperature difference. If the defrosting condition of the unit is met in the process, the unit enters the defrosting and then stops the fan, and the EC fan advances the time t after the system meets the defrosting conditionhWhen the EC fan is started for 10s (delay of defrosting fan), the EC fan rotates at the maximum speed NmaxOperating time t of 20rpsdhAnd 60s (operation time after defrosting) enters the PID closed-loop control again.
The basic idea of PID control is to consider the output of the controller to be proportional to the controller input (deviation e), proportional to the integral of the controller input, proportional to the derivative of the controller input, and combine these three terms linearly to obtain the PID calculation formula:
Figure BDA0003090072200000151
wherein KPIs a proportionality coefficient; t isIIs the integration time; t isDIs the differential time; u shape0For the opening and the rotating speed n of the direct current frequency conversion fanC. The transfer function of the PID controller can be obtained by performing Laplace transform on the formula (1), as shown below
Figure BDA0003090072200000152
Discretizing the transfer function to obtain the following digital PID control calculation formula:
Figure BDA0003090072200000153
Figure BDA0003090072200000154
Figure BDA0003090072200000161
where τ is the sampling period
By programming the digital PID control algorithm on the main control board of the unit, the PID control logic of the direct-current variable-frequency fan can be obtained, for example, the incremental incomplete differential PID algorithm is adopted for programming, the accumulated deviation e (k) is not accumulated, the calculated amount and the stored amount of chip data are reduced, the integral saturation phenomenon is not easy to cause, the error action influence of the incremental value of the rotating speed of the direct-current variable-frequency fan output by the controller is small, (of course, the invention is not limited to the incremental incomplete differential PID algorithm or the incremental differential advanced PID algorithm, and the like, and is only used for illustration) and the PID basic parameters are required to be set in a line controller of the unit: the proportionality coefficient is: kP(ii) a Integration time: t isI(ii) a Differential time: t isDAnd sampling period: τ, action cycle: theta; wherein the sampling period is the sampling interval in PID calculation, and the action period is straightThe frequency reduction or frequency increase period of the current variable frequency fan is carried out according to the PID calculation result (namely the rotating speed of the direct current variable frequency fan acts once every action period theta according to the calculation result), and the two parameters are used as a readable and writable mode to facilitate the selection of the optimal sampling period parameter value and the rotating speed regulation period of the direct current variable frequency fan when the unit is operated and debugged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. A fan control method of a full-direct-current variable-frequency air-cooling module machine is characterized by comprising the following steps: dividing the ambient temperature into a plurality of sections of continuous temperature intervals, wherein each section of temperature interval is correspondingly provided with a target cold-environment temperature difference in a refrigeration mode, and each section of temperature interval is correspondingly provided with a target steaming temperature difference in a heating mode;
each target cold ring temperature difference or each target ring evaporation temperature difference is correspondingly provided with a dead zone deviation;
calculating a deviation value of the actual cooling ring temperature difference and the target cooling ring temperature difference or a deviation value of the actual circulating evaporation temperature difference and the target circulating evaporation temperature difference;
and executing PID closed-loop control corresponding to each temperature interval based on the comparison result of the deviation value and the dead zone deviation.
2. The control method of the full-direct-current variable-frequency air-cooled modular machine fan according to claim 1, characterized in that the control method in the refrigeration mode specifically comprises the following steps:
(11) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(12) Setting a refrigeration mode and giving a starting command;
(13) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial opening speed n of the DC frequency conversion fancAnd initial opening holding time TC；
(14) Initial opening holding time TcAfter the end, the current ambient temperature T is detected againO2Value and system condensing temperature TcValue, calculating the actual cold ring temperature difference Δ Tc；
(15) According to the current ambient temperature TO2Determining target cold ring temperature difference delta T in the environment temperature intervalC-setDeviation from corresponding cooling dead zone Δ EC-set；
(16) Calculating a deviation value e based on the actual cold ring temperature difference and the target cold ring temperature difference, wherein the deviation value e is equal to the actual cold ring temperature difference delta TCTarget cold ring temperature difference Δ TC-setThe deviation value E and the refrigeration dead zone deviation delta EC-setAnd comparing, and entering PID closed-loop control of a corresponding temperature interval.
3. The control method of the full-direct-current variable-frequency air-cooling module machine fan according to claim 1, characterized in that the control method in the heating mode specifically comprises the following steps:
(21) detecting the ambient temperature T in the power-on standby mode of the unitO1And the system inlet water temperature Tin；
(22) Setting a heating mode and giving a starting command;
(23) according to the ambient temperature TO1And the system inlet water temperature TinCalculating the initial opening speed n of the direct current variable frequency fancAnd initial opening holding time TH；
(24) Initial opening holding time THAfter the end, the current ambient temperature T is detected againO2And the evaporation temperature T of the systemECalculating the actual temperature difference delta T of the ring evaporationH；
(25) According to the current ambient temperature TO2Confirming target ring evaporation temperature difference delta T in the sectionH-setDeviation Delta E from corresponding heating dead zoneH-set；
(26) Calculating a deviation value e based on the actual ring evaporation temperature difference and the target ring evaporation temperature difference, wherein the deviation value e is equal to the actual ring evaporation temperature difference delta THTarget ring-evaporation temperature difference Δ TH-setThe deviation value E is deviated from the heating dead zone by delta EH-setAnd comparing, and entering PID closed-loop control of a corresponding temperature interval.
4. The full direct-current variable-frequency air-cooled modular machine fan control method according to claim 2, characterized in that: initial opening speed n of direct current frequency conversion fan in refrigeration modecCalculating the formula:
Figure FDA0003090072190000021
wherein alpha isC、βCCalculating a parameter, gamma, for the initial fan speed of the refrigeration operationCCorrection factor of initial opening speed of fan, gamma, for refrigerating operationCIs set according to different ring temperature intervals, NminThe lowest allowable rotating speed of the DC variable frequency fan is calculated as nCSatisfies the condition nC≥NmaxThen n isCTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in refrigeration modecCalculating the formula:
Figure FDA0003090072190000022
wherein T isaCInitial reference ambient temperature, t, for refrigerationminThe minimum wind speed maintaining time, lambda, of the direct current variable frequency fan in the starting processCMaintaining a correction factor, λ, for initial start-up of the fan for refrigeration operationCAnd setting parameters according to different ring temperature intervals.
5. The full direct-current variable-frequency air-cooled modular machine fan control method according to claim 3, characterized in that: initial opening speed n of direct-current variable-frequency fan in heating modecCalculating the formula:
Figure FDA0003090072190000031
wherein alpha isH、βHCalculating a parameter, gamma, for the initial fan speed of heating operationHCorrection factor of initial opening speed of fan for heating operation, gammaHIs set according to different ring temperature intervals, NminAllowing the lowest rotation speed of the direct-current variable-frequency fan, and calculating n through a formula ifH≥NmaxThen n isHTaking the value as the maximum allowable rotating speed N of the direct-current variable-frequency fanmax；
Initial opening speed maintaining time t of direct current variable frequency fan in heating modeHCalculating the formula:
Figure FDA0003090072190000032
wherein T isaHInitial reference ambient temperature, t, for heatingminThe minimum wind speed maintaining time, lambda, of the direct current variable frequency fan in the starting processHMaintaining correction factor, lambda, for initial startup of fan for heating operationHAnd setting parameters according to different ring temperature intervals.
6. The full direct-current variable-frequency air-cooled modular machine fan control method according to claim 2, characterized in that: after the refrigeration mode or the heating mode enters PID closed-loop control, PID control is calculated once every sampling period tau time, and the rotating speed of the EC fan is regulated once every action period theta time;
the sampling period tau and the action period theta are both set values inside the program.
7. The control method of the full-direct-current variable-frequency air-cooling module machine fan according to claim 3, characterized by further comprising a control method when entering a defrosting mode under a heating mode, specifically as follows:
based on the current ambient temperature TO2Value and system evaporating temperature TEJudging whether the defrosting condition is met or not;
when the defrosting condition is met, the unit enters a defrosting mode, the direct-current variable-frequency fan quits PID control and stops running, and when the unit meets the defrosting condition, the direct-current variable-frequency fan quitsMechanical advance thIs turned on and at a maximum speed NmaxRun for a duration of tdhThen, the PID control is performed again in step (24).
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