CN113701400A - Control method for frequency conversion dual-combined heat pump module online - Google Patents
Control method for frequency conversion dual-combined heat pump module online Download PDFInfo
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- CN113701400A CN113701400A CN202111007091.8A CN202111007091A CN113701400A CN 113701400 A CN113701400 A CN 113701400A CN 202111007091 A CN202111007091 A CN 202111007091A CN 113701400 A CN113701400 A CN 113701400A
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- 238000006243 chemical reaction Methods 0.000 title abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 230000009977 dual effect Effects 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- 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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Abstract
The invention discloses a control method for the on-line of a variable-frequency dual-combined heat pump module, belongs to the technical field of control methods of heat pumps, and is designed for solving the problems of low accuracy and the like of the existing control method. The invention discloses a control method for the on-line of a variable-frequency dual-combined heat pump moduledThe last detection module controls the water temperature Td‑1Module set water temperature TkAnd the detection period t and the constant temperature difference A of the setting module system judge the loading and/or load shedding requirements of the variable frequency dual-combined heat pump unit module. The control method for the frequency conversion dual-combined heat pump module online has the advantages that the calculated data are more accurate, the error is small, and the control precision is high; the stepless adjustable load and load increasing and reducing mode is realized, the energy adjusting advantages of the frequency conversion unit are exerted, and a stable and comfortable temperature environment is provided for the indoor environment.
Description
Technical Field
The invention relates to the technical field of control methods of heat pumps, in particular to a control method of an on-line variable-frequency two-combined heat pump module and an on-line variable-frequency two-combined heat pump module using the control method.
Background
Heat pump units are mechanical devices that force heat from a low temperature object to a high temperature object in a reverse cycle manner, and in order to facilitate control and reduce energy consumption, variable frequency compressors are commonly used.
The control method of the existing frequency conversion two-combined heat pump unit comprises the following steps: determining a current corresponding load increase and decrease amplitude interval according to the difference value of the detected current actual water temperature and the target water temperature, and continuously detecting the actual water temperature change rate of each period by taking the fixed time length as one period; and calculating the load and load shedding amplitude of the compressor according to the current corresponding load and load shedding amplitude interval and the current period actual water temperature change rate, and performing corresponding load and load shedding adjustment on the current frequency of the compressor according to the obtained load and load shedding amplitude of the compressor.
The defects of the control method are as follows: the load and load shedding amplitude of the compressor is calculated only by using the current corresponding load and load shedding amplitude interval and the current period actual water temperature change rate, so that the error is large, and the control precision is low.
Disclosure of Invention
One objective of the present invention is to provide a method for controlling the on-line of the variable frequency dual co-generation heat pump module with higher accuracy.
Another objective of the present invention is to provide a variable frequency two-in-one heat pump module on-line which is more comfortable to use.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a control method for the on-line of frequency conversion dual-combined heat pump module is characterized by controlling the water temperature T according to a detection module when at least two frequency conversion dual-combined heat pump unit modules are in on-line operationdThe last detection module controls the water temperature Td-1Module set water temperature TkAnd the detection period t and the constant temperature difference A of the setting module system judge the loading and/or load shedding requirements of the variable frequency dual-combined heat pump unit module.
In particular, the method comprises the following steps:
step S1, respectively measuring and recording the water temperature T controlled by the detection moduledAnd the last detection module controls the water temperature Td-1Respectively determining the set water temperature T of the modulekThe detection period t and the constant temperature difference A of the setting module system;
step S2, controlling the water temperature T according to the detection moduledAnd the module sets the water temperature TkObtaining the module water temperature deviation value delta T in the detection period Tk，△Tk＝Tk-Td；
Step S3, controlling the water temperature T according to the detection moduledAnd the last detection module controls the water temperature Td-1Obtaining the water temperature change rate Delta T in the detection period Td，△Td＝Td-Td-1；
Step S4, according to the module water temperature deviation value delta TkThe rate of change of the water temperature Δ TdThe detection period t and the constant temperature difference A of the set module system obtain the number of the units loaded or unloaded by the variable frequency dual-combined heat pump module;
step S5: according to the water temperature deviation value delta T of the modulekThe rate of change of the water temperature Δ TdAnd the detection period t and the constant temperature difference A of the set module system obtain the adjusting frequency of the running unit in the variable frequency two-combined heat pump module.
In particular, the step S4 further includes: and sequentially loading or unloading one by one according to the number of the obtained units for loading or unloading the variable-frequency dual-combined heat pump module.
In particular, the step S5 further includes: and after the adjusting frequency of the running unit in the variable-frequency dual-combined heat pump module is obtained, modifying the adjusting frequency until the water temperature of the online variable-frequency dual-combined heat pump module is kept stable.
In particular, the step S4 is executed by a method of looking up a table or presetting an algorithm in the PID control module according to the module water temperature deviation value Δ TkThe rate of change of the water temperature Δ TdThe detection period t and the constant temperature difference A of the setting module system obtain two frequency conversionThe number of the units for loading or unloading the combined heat pump module.
In particular, the step S5 is executed by a method of looking up a table or presetting an algorithm in the PID control module according to the module water temperature deviation value Δ TkThe rate of change of the water temperature Δ TdAnd the detection period t and the constant temperature difference A of the set module system obtain the adjusting frequency of the running unit in the variable frequency two-combined heat pump module.
Particularly, the constant temperature difference A of the module system is set as a preset parameter value.
In particular, the constant temperature difference A of the setting module system is in an element of [1 ℃ and 5 ℃).
On the other hand, the invention adopts the following technical scheme:
a frequency conversion dual-combined heat pump module on-line comprises at least two frequency conversion dual-combined heat pump unit module on-lines and a control method using the frequency conversion dual-combined heat pump module on-line.
According to the control method for the frequency conversion dual co-generation heat pump module online, the constant temperature difference A of the set module system is used as a parameter for judging the loading and/or unloading requirements of the frequency conversion dual co-generation heat pump unit module, the calculated data are more accurate, the error is small, and the control precision is high; the load and/or load shedding of the frequency conversion dual co-generation heat pump unit module can be adjusted according to water temperature change, a load increasing and reducing mode of stepless energy adjustment is realized, the energy adjustment advantages of the frequency conversion unit are exerted, the frequency conversion dual co-generation heat pump unit module system can be stably controlled, the energy of the frequency conversion dual co-generation heat pump unit can be adjusted according to indoor load, and a stable and comfortable temperature environment is provided for the indoor environment.
According to the frequency conversion dual co-generation heat pump module online control method, the frequency conversion dual co-generation heat pump module online control method is used, the control precision is higher, the calculated data is more accurate when the loading and/or unloading requirements of the frequency conversion dual co-generation heat pump unit module are judged, and the error is smaller; the frequency conversion heat pump unit module system can be stably controlled, the frequency conversion heat pump unit system can adjust energy according to indoor load, the use is more convenient, and the control of the heat pump unit on the environment temperature is more in line with the use requirement.
Drawings
Fig. 1 is a flowchart of a method for controlling an on-line of a variable frequency dual-combined heat pump module according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The embodiment provides a control method for the on-line of a variable-frequency dual-combined heat pump module, which is applied to a device formed by at least two variable-frequency dual-combined heat pump unit modules on-line and controls the water temperature T according to a detection moduledThe last detection module controls the water temperature Td-1Module set water temperature TkAnd the detection period t and the constant temperature difference A of the setting module system judge the loading and/or load shedding requirements of the variable frequency dual-combined heat pump unit module.
According to the control method for the on-line of the variable-frequency two-combined-supply heat pump module, the constant temperature difference A of the set module system is used as a parameter for judging the loading and/or unloading requirements of the variable-frequency two-combined-supply heat pump unit module, the calculated data are more accurate, the error is small, and the control precision is high; the energy adjustment is carried out on the loading and/or the load shedding of the frequency conversion dual co-generation heat pump unit module according to the water temperature change, the load increasing and reducing mode of stepless energy adjustment is realized, the energy adjustment advantages of the frequency conversion unit are exerted, the frequency conversion dual co-generation heat pump unit module system can be stably controlled, the energy adjustment can be carried out on the heat pump unit module according to indoor load, and a stable and comfortable temperature environment is provided for the indoor environment.
The concrete steps of the control method are not limited, and the water temperature T can be controlled by utilizing the detection moduledThe last detection module controls the water temperature Td-1Module set water temperature TkAnd the detection period t and the constant temperature difference A of the setting module system are used for judging the loading and/or load shedding requirements of the variable frequency dual-combined heat pump unit module. Preferably, the control method includes the steps of:
step S1, respectively measuring and recording the water temperature T controlled by the detection moduledAnd the last detection module controls the water temperature Td-1Respectively determining the set water temperature T of the modulekThe method comprises the steps of detecting a period t and setting a constant temperature difference A of a module system.
Step S2, controlling the water temperature T according to the detection moduledAnd module set water temperature TkObtaining the module water temperature deviation value delta T in the detection period Tk，△Tk＝Tk-Td。
Step S3, controlling the water temperature T according to the detection moduledAnd the last detection module controls the water temperature Td-1Obtaining the water temperature change rate Delta T in the detection period Td，△Td＝Td-Td-1。
Step S4, according to the module water temperature deviation value delta TkWater temperature change rate Δ TdAnd the detection period t and the constant temperature difference A of the set module system are set to obtain the number of the units loaded or unloaded by the variable-frequency dual-combined heat pump module. Then, the loads or the unloads are sequentially carried out one by one.
Step S5: according to the deviation value delta T of the water temperature of the modulekWater temperature change rate Δ TdAnd the detection period t and the constant temperature difference A of the setting module system obtain the adjusting frequency of the running unit in the variable frequency two-combined heat pump module. And then, modifying and adjusting the frequency until the temperature of the water of the frequency conversion dual-combined heat pump module is kept stable.
"according to Module Water temperature deviation value Δ T" in step S4kWater temperature change rate Δ TdDetecting the period T and setting the constant temperature difference A of the module system to obtain the number of the units loaded or unloaded by the variable frequency dual-combined heat pump module and the step S5 of obtaining the water temperature deviation value delta T according to the moduleskWater temperature change rate Δ TdThe specific method for obtaining the adjusting frequency of the operating unit in the variable-frequency two-combined-supply heat pump module by the detection period t and the setting of the constant temperature difference A of the module system is not limited, preferably, a table can be preset, and a required result is obtained by looking up the table; or the algorithm (functional expression) can be preset in the PID control module to calculate the required result.
The determination method of the table content is not limited, and the table content can be obtained by multiple tests, can also be obtained by calculation according to a theoretical formula, and can also be obtained by combining the two methods of multiple tests and calculation according to the theoretical formula. The specific table lookup method is not limited, and the existing table lookup methods can be applied to the embodiment.
The specific function formula preset by the PID control module is not limited, and in the prior art, the function formula can be used for obtaining the number of the units loaded or unloaded by the variable-frequency two-combined heat pump module and the function formula for obtaining the adjusting frequency of the running units in the variable-frequency two-combined heat pump module. Of course, since the existing functional expression does not include the parameter of the setting module system constant temperature difference a, the existing functional expression needs to be simply modified, that is, the setting module system constant temperature difference a needs to be added to the existing functional expression.
Preferably, in the cooling mode: when the current temperature is less than the set temperature and the constant temperature difference A of the module system or the current temperature is more than the set temperature, the module unit loads/unloads the units, and the number of the loading/unloading units f1 is a x Tk-b×△TdWherein a and b are set parameters, a E [ -5, 5 [ ]]，b∈[-5，5]。
When the set temperature-the constant temperature difference A of the module system is less than the current temperature and less than the set temperature, the module unit carries out frequency modulation loading or load shedding, and the loading/load shedding frequency f2 of the operating frequency is equal to c x delta Tk-d×△TdWherein c and d are set parameters, c ∈ [ -5, 5 [ ]]，d∈[-5，5]。
In the heating mode: when the current temperature is larger than the set temperature and the constant temperature difference A of the module system or the current temperature is smaller than the set temperature, the module unit loads/unloads the units, and the number of the loading/unloading units f1 is a x Tk+b×△TdWherein a and b are set parameters, a E [ -5, 5 [ ]]，b∈[-5，5]。
When the set temperature is less than the current temperature and less than the set temperature plus the constant temperature difference A of the module system, the module unit carries out frequency modulation loading or load shedding, and the loading/load shedding frequency f2 of the operating frequency is equal to c x delta Tk+d×△TdWherein c and d are set parameters, c ∈ [ -5, 5 [ ]]，d∈[-5，5]。
The specific values of a, b, c and d can be obtained by theoretical calculation, experimental measurement or detection in actual use.
The constant temperature difference A of the module system is set as a parameter value preset by a user or a manufacturer as required, and the parameter value can be obtained through experiments, can also be obtained through functional calculation, and can also be obtained through the past use experience. Setting the constant temperature difference A of the module system to be preferably between 1 ℃ and 5 ℃, and more preferably setting the constant temperature difference A of the module system to be 2 ℃, 3 ℃, 3.5 ℃ and 4 ℃.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. The control method for the on-line of the variable-frequency two-combined heat pump module is characterized in that when at least two variable-frequency two-combined heat pump unit modules run on-line, the water temperature T is controlled according to the detection moduledThe last detection module controls the water temperature Td-1Module set water temperature TkAnd the detection period t and the constant temperature difference A of the setting module system judge the loading and/or load shedding requirements of the variable frequency dual-combined heat pump unit module.
2. The control method for the online of the variable-frequency two-combined heat pump module according to claim 1, characterized by comprising the following steps of:
step S1, respectively measuring and recording the water temperature T controlled by the detection moduledAnd the last detection module controls the water temperature Td-1Respectively determining the set water temperature T of the modulekThe detection period t and the constant temperature difference A of the setting module system;
step S2, controlling the water temperature T according to the detection moduledAnd the module sets the water temperature TkObtaining the module water temperature deviation value delta T in the detection period Tk，△Tk＝Tk-Td；
Step S3, controlling the water temperature T according to the detection moduledAnd the last detection module controls the water temperature Td-1Obtaining the water temperature change rate Delta T in the detection period Td，△Td＝Td-Td-1；
Step S4, according to the module water temperature deviation value delta TkThe rate of change of the water temperature Δ TdThe detection period t and the constant temperature difference A of the set module system obtain the number of the units loaded or unloaded by the variable frequency dual-combined heat pump module;
step S5: according to the water temperature deviation value delta T of the modulekThe rate of change of the water temperature Δ TdAnd the detection period t and the constant temperature difference A of the set module system obtain the adjusting frequency of the running unit in the variable frequency two-combined heat pump module.
3. The method for controlling the on-line of the variable-frequency two-combined heat pump module according to claim 2, wherein the step S4 further comprises: and sequentially loading or unloading one by one according to the number of the obtained units for loading or unloading the variable-frequency dual-combined heat pump module.
4. The method for controlling the on-line of the variable-frequency two-combined heat pump module according to claim 2, wherein the step S5 further comprises: and after the adjusting frequency of the running unit in the variable-frequency dual-combined heat pump module is obtained, modifying the adjusting frequency until the water temperature of the online variable-frequency dual-combined heat pump module is kept stable.
5. The method for controlling the on-line of the variable-frequency dual-combined heat pump module according to claim 2, wherein the step S4 is implemented by a method of table lookup or algorithm presetting in a PID control module according to the module water temperature deviation value Δ TkThe rate of change of the water temperature Δ TdAnd the detection period t and the constant temperature difference A of the set module system obtain the number of the units loaded or unloaded by the variable-frequency dual-combined heat pump module.
6. The method for controlling the on-line of the variable-frequency dual-combined heat pump module according to claim 2, wherein the step S5 is implemented by a method of table lookup or algorithm presetting in a PID control module according to the module water temperature deviation value Δ TkThe rate of change of the water temperature Δ TdAnd the detection period t and the constant temperature difference A of the set module system obtain the adjusting frequency of the running unit in the variable frequency two-combined heat pump module.
7. The method for controlling the on-line of the variable-frequency dual-combined heat pump module according to any one of claims 1 to 6, wherein the constant temperature difference A of the module system is set to be a preset parameter value.
8. The control method for the on-line of the variable-frequency cogeneration heat pump module according to claim 7, wherein the set module system constant temperature difference A e [1 ℃, 5 ℃).
9. The variable-frequency dual co-generation heat pump module online machine is characterized by comprising at least two variable-frequency dual co-generation heat pump unit module online machines, and the control method of the variable-frequency dual co-generation heat pump module online machine according to any one of claims 1 to 8 is used.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115682651A (en) * | 2022-10-26 | 2023-02-03 | 珠海格力电器股份有限公司 | Air source heat pump dryer control method and device and air source heat pump dryer |
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Application publication date: 20211126 |