CN110905791A - Compressor frequency control method, device and equipment - Google Patents
Compressor frequency control method, device and equipment Download PDFInfo
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- CN110905791A CN110905791A CN201911143319.9A CN201911143319A CN110905791A CN 110905791 A CN110905791 A CN 110905791A CN 201911143319 A CN201911143319 A CN 201911143319A CN 110905791 A CN110905791 A CN 110905791A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
Abstract
The invention discloses a method, a device and equipment for controlling the frequency of a compressor. Wherein, the method comprises the following steps: judging whether the unit is unloaded or not; if the unit is unloaded, further judging that the compressor is in an unloading frequency limiting state or an unloading frequency reducing state; if the compressor is in the unloading frequency limiting state, executing water temperature frequency control operation; if the compressor is in the unloaded down-conversion state, the down-conversion control operation is performed. According to the invention, when the unit unloads the frequency limitation under higher frequency, the compressor is controlled to continue to reduce the frequency by judging the outlet water temperature of the evaporator, so that the unit unloads the frequency limitation under higher frequency, and the frequency can continue to be reduced when the outlet water temperature of the evaporator meets the frequency reduction condition, thereby being beneficial to relieving the pressure of high-load operation of the unit and ensuring more stable operation of the unit.
Description
Technical Field
The invention relates to the technical field of frequency conversion units, in particular to a method, a device and equipment for controlling the frequency of a compressor.
Background
The compressor frequency modulation of the existing water system unit has the following two conditions: firstly, when the unit is in a normal state, the frequency is controlled to rise and fall through the water temperature, and the frequency limitation control is also carried out in a certain water temperature interval (the current frequency is kept to operate); and secondly, when the compressor is in an unloading state, if the unloading conditions such as high pressure, low pressure and the like occur, the compressor can limit frequency or reduce frequency aiming at different alarm intervals so as to protect the unit. In actual work, the situation is often complex. When the two conflict, such as the simultaneous occurrence of water temperature raising and lowering frequency and unloading frequency limitation, the unloading state is usually set as a higher priority, that is, the unloading frequency limitation is processed. Therefore, the frequency limitation of the unit can be unloaded at a higher frequency, but the frequency limitation can not be continued even if the water temperature is reduced. And the frequency reduction at the moment is favorable for relieving the pressure of high-load operation of the unit and ensuring the more stable operation of the unit.
Aiming at the problem that the frequency limitation of the unit is unloaded at a higher frequency and the frequency can not be reduced continuously in other modes in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for controlling the frequency of a compressor, and aims to solve the problem that in the prior art, a unit can not continue to reduce the frequency by other modes when unloading the limited frequency at a higher frequency.
In order to solve the above technical problem, the present invention provides a method for controlling a frequency of a compressor, wherein the method comprises:
judging whether the unit is unloaded or not;
if the unit is unloaded, further judging that the compressor is in an unloading frequency limiting state or an unloading frequency reducing state;
if the compressor is in the unloading frequency limiting state, executing water temperature frequency control operation; if the compressor is in the unloaded down-conversion state, the down-conversion control operation is performed.
Further, after judging whether the unit is unloaded, the method further comprises the following steps:
and if the unit is not unloaded, adjusting the frequency of the compressor according to the actual outlet water temperature and the preset outlet water temperature of the evaporator.
Further, according to the actual leaving water temperature of evaporimeter and preset leaving water temperature, the frequency of adjustment compressor includes:
calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
controlling the compressor frequency to decrease if the absolute value is less than or equal to a first preset value;
if the absolute value is greater than a first preset value and less than a second preset value, controlling the compressor to keep the current frequency;
if the absolute value is greater than or equal to a second preset value, controlling the frequency of the compressor to increase;
wherein the second preset value is greater than the first preset value.
Further, if the compressor is in the unloading frequency limiting state, performing water temperature frequency control operation, including:
calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
if the absolute value is less than or equal to a first preset value, controlling the frequency of the compressor to be reduced;
and if the absolute value is greater than a first preset value, controlling the compressor to keep the current frequency.
Further, if the compressor is in the unloaded down conversion state, performing a down conversion control operation including:
comparing the current operating frequency of the compressor with a preset frequency;
if the current running frequency of the compressor is less than or equal to the preset frequency, controlling the compressor to run at the preset frequency;
and if the current running frequency of the compressor is greater than the preset frequency, controlling the frequency of the compressor to continuously reduce.
Further, judging whether the unit is unloaded or not comprises the following steps:
depending on the compressor discharge pressure value, or,
the value of the compressor operating current, or,
and judging whether the unit is unloaded or not according to the working voltage value of the compressor.
Further, whether the unit has unloading is judged according to the exhaust pressure value of the compressor, and the method comprises the following steps:
comparing the compressor discharge pressure value with a first pressure threshold value;
if the exhaust pressure value of the compressor is smaller than the first pressure threshold value, judging that the unit is not unloaded;
and if the discharge pressure value of the compressor is greater than or equal to the first pressure threshold value, judging that the unit has unloading.
Further, the determining that the compressor is in the unloading frequency limiting state or the unloading frequency reducing state includes:
comparing the compressor discharge pressure value with a second pressure threshold value;
if the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, the compressor is judged to be in an unloading frequency limiting state;
and if the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value.
The present invention also provides a compressor frequency control apparatus, wherein the apparatus comprises:
the judging module is used for judging whether the unit is unloaded; if the unit is unloaded, the compressor is further judged to be in an unloading frequency limiting state or an unloading frequency reducing state;
the water temperature frequency control module is used for executing water temperature frequency control operation when the compressor is in an unloading frequency limiting state;
and the frequency reduction control module is used for executing frequency reduction control operation when the compressor is in an unloading frequency reduction state.
Further, the apparatus further comprises:
and the water temperature frequency modulation module is used for adjusting the frequency of the compressor according to the actual outlet water temperature and the preset outlet water temperature of the evaporator under the condition that the judging result of the judging module is that the unit is not unloaded.
Further, the water temperature frequency control module comprises:
the first calculating unit is used for calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
a first processing unit for controlling the frequency of the compressor to be lowered when the absolute value is less than or equal to a first preset value; and when the absolute value is greater than a first preset value, controlling the compressor to keep the current frequency.
Further, the frequency reduction control module comprises:
the second calculating unit is used for calculating the difference value between the current running frequency of the compressor and the preset frequency when the compressor is in an unloading frequency reduction state;
the second processing unit is used for controlling the compressor to operate at the preset frequency when the difference value is less than or equal to zero; and when the difference value is larger than zero, controlling the compressor frequency to continuously reduce.
Further, the judging module comprises:
the unloading judgment unit is used for comparing the exhaust pressure value of the compressor with a first pressure threshold value; when the exhaust pressure value of the compressor is smaller than a first pressure threshold value, judging that the unit is not unloaded; and when the discharge pressure value of the compressor is greater than or equal to the first pressure threshold value, judging that the unit has unloading.
Further, the determining module further includes:
the state judgment unit is used for comparing the exhaust pressure value of the compressor with a second pressure threshold value; when the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, judging that the compressor is in an unloading frequency limiting state; and when the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value.
The invention also provides equipment comprising the compressor frequency control device.
The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program realizes the above-mentioned method when executed by a processor.
By applying the technical scheme of the invention, when the unit unloads the frequency limit at higher frequency, the compressor is controlled to continue to reduce the frequency by judging the outlet water temperature of the evaporator, so that the unit unloads the frequency limit at higher frequency, and the frequency can continue to be reduced when the outlet water temperature of the evaporator meets the frequency reduction condition, thereby being beneficial to relieving the pressure of high-load operation of the unit and ensuring more stable operation of the unit.
Drawings
FIG. 1 is a flow chart of a compressor frequency control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a compressor frequency control method according to another embodiment of the present invention;
fig. 3 is a structural view of a frequency control apparatus of a compressor according to another embodiment of the present invention;
fig. 4 is a structural view of a frequency control apparatus of a compressor according to still another embodiment of the present invention;
fig. 5 is a structural view of a frequency control apparatus of a compressor according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe preset values in embodiments of the present invention, these preset values should not be limited to these terms. These terms are only used to distinguish between different preset values. For example, the first preset value may also be referred to as a second preset value, and similarly, the second preset value may also be referred to as a first preset value without departing from the scope of the embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a compressor frequency control method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
s101, judging whether the unit is unloaded or not;
in specific implementation, whether the compressor has unloading is closely related to the discharge pressure of the compressor, and unloading is caused when the discharge pressure of the compressor exceeds a certain value, in order to realize accurate judgment, whether unloading exists can be judged through the discharge pressure of the compressor, specifically, whether unloading exists in a unit is judged, including: comparing a discharge pressure value of the compressor with a first pressure threshold value, wherein the first pressure threshold value is an unloading pressure value of the compressor; if the compressor exhaust pressure value is smaller than the first pressure threshold value, the compressor exhaust pressure value does not reach the unloading pressure value, and at the moment, the unit is judged not to be unloaded; if the compressor discharge pressure value is greater than or equal to the first pressure threshold value, it is indicated that the compressor discharge pressure value has reached or exceeded the unloading pressure value, at this time, it is determined that the unit is unloaded, whether the unit is unloaded is determined through the compressor discharge pressure value, the real operating condition of the compressor can be objectively reflected, and the determination result is more accurate.
It should be noted that, in other embodiments, it may be determined whether the unit is unloaded by other means, for example, by the magnitude of the working current or the working voltage of the compressor, and it is determined whether the unit is unloaded when the working current or the working voltage of the compressor reaches or exceeds a preset threshold, and it is determined that the unit is not unloaded when the working current or the working voltage does not reach the preset threshold.
S102, if the unit is unloaded, further judging that the compressor is in an unloading frequency limiting state or an unloading frequency reducing state;
during the concrete implementation, after compressor discharge pressure value exceeded the uninstallation pressure value, the frequency of compressor can not continue to rise again, and the compressor was in the uninstallation limit frequency state this moment, and after compressor discharge pressure value continued to rise to a definite value, the frequency that need control the compressor reduced, and the compressor entered the uninstallation and decreased the frequency state this moment, consequently, judge that the compressor is in the uninstallation limit frequency state or the state of uninstallation and decrease the frequency and include: after the unit is judged to be unloaded, comparing the exhaust pressure value of the compressor with a second pressure threshold value; if the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, the compressor is judged to be in an unloading frequency limiting state; if the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value;
s103, if the compressor is in an unloading frequency limiting state, executing water temperature frequency control operation; if the compressor is in the unloaded down-conversion state, the down-conversion control operation is performed.
In the actual operation process, the larger the difference between the actual outlet water temperature of the evaporator and the preset temperature is, the larger the described working load of the compressor is, in order to meet the load demand, the frequency of the compressor needs to be adjusted according to the difference between the actual outlet water temperature and the preset temperature, therefore, in order to realize the frequency control of the compressor in the unloading frequency-limited state, in some embodiments, a threshold value of an absolute value of the difference between the actual outlet water temperature and the preset temperature is set, that is, a first preset value, and the water temperature frequency control operation is executed, which specifically includes: calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature; if the absolute value is less than or equal to the first preset value, it indicates that the working load of the compressor is low at this time, and the frequency of the compressor can be controlled to be reduced, in this embodiment, the preset outlet water temperature is a preset outlet water temperature value of the evaporator, and a person skilled in the art can set the preset outlet water temperature value according to the operation parameters and the actual conditions of the unit; if the absolute value is larger than the first preset value, the working load of the compressor is larger at the moment, but the frequency of the compressor cannot be increased any more because the compressor is in an unloading frequency limiting state at the moment so as to avoid the running pressure of the weighting unit, and therefore the compressor is controlled to keep the current frequency.
In order to realize the control of the compressor frequency in the unloading frequency reduction state, the method for controlling the compressor frequency of the embodiment further includes: if the compressor is in the unloaded down conversion state, performing a down conversion control operation including: comparing the current operating frequency of the compressor with a preset frequency; if the current running frequency of the compressor is less than or equal to the preset frequency, controlling the compressor to run at the preset frequency; if the current running frequency of the compressor is greater than the preset frequency, controlling the frequency of the compressor to continuously reduce, wherein the preset frequency is the preset minimum running frequency of the compressor, and through the steps, the compressor can keep running at the minimum running frequency after the frequency of the compressor is reduced to the minimum running frequency, so that the situation that the running frequency of the compressor enters a standby state after being reduced to zero is avoided, and the compressor is started again after meeting the starting condition, so that frequent starting and stopping are caused, and the service life of the compressor is influenced.
In order to realize the control of the compressor frequency under the condition that the unit is not unloaded, the method for controlling the compressor frequency of the embodiment further comprises the following steps: if the unit does not unload, then according to the actual leaving water temperature and the preset leaving water temperature of evaporimeter, adjust the frequency of compressor, specifically include: calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature; if the absolute value is smaller than or equal to a first preset value, the working load of the compressor is lower at the moment, and the frequency of the compressor is controlled to be reduced; if the absolute value is larger than the first preset value and smaller than the second preset value, the working amount of the compressor is moderate at the moment, the frequency of the compressor does not need to be changed, and the compressor is controlled to keep the current frequency at the moment; if the absolute value is larger than or equal to a second preset value, the working load of the compressor is larger at the moment, the frequency of the compressor needs to be controlled to be increased at the moment so as to meet the requirement of the working load, wherein the second preset value is larger than the first preset value.
By the frequency control method, when the unit unloads the frequency limitation at a higher frequency, the compressor is controlled to continue to reduce the frequency by judging the outlet water temperature of the evaporator and adopting a water temperature frequency reduction mode, so that the unit unloads the frequency limitation at the higher frequency, and the outlet water temperature of the evaporator meets the frequency reduction condition, the frequency can be reduced continuously, the pressure of high-load operation of the unit is relieved, and the more stable operation of the unit is ensured.
Example 2
Fig. 2 is a flowchart of a frequency control method of a compressor according to another embodiment of the present invention, as shown in fig. 2,
s201, judging whether the unit is unloaded or not, judging whether the unloading is carried out or not by judging whether the unloading pressure value of the compressor reaches the unloading pressure value or not, if the unloading pressure value is reached, judging that the unloading is carried out, and if the unloading pressure value is not reached, judging that the unloading is not carried out;
s202, when the unit is not unloaded, adjusting the frequency of the compressor by adopting a PID algorithm according to the water temperature; the method specifically comprises the following steps:
s202-1, if the actual outlet water temperature TMeasured in factWhen the absolute value △ T of the difference between the preset water outlet temperature Tc and the preset water outlet temperature Tc is less than or equal to a first preset value △ T1, controlling the frequency of the compressor to be reduced;
s202-2, if the absolute value △ T is greater than a first preset value △ T1 and less than a second preset value △ T2, controlling the compressor to keep the current frequency;
s202-3, if the absolute value △ T is greater than or equal to a second preset value △ T2, controlling the frequency of the compressor to increase.
S203, when the unit is unloaded, judging that an unloading frequency reducing condition or an unloading frequency limiting condition is met, and judging that the unit meets the unloading frequency reducing condition or the unloading frequency limiting condition, specifically, judging whether the exhaust pressure of the compressor exceeds the unloading frequency reducing pressure, if so, judging that the compressor meets the unloading frequency reducing condition, and if not, meeting the unloading frequency reducing condition;
s204, if the unit meets the unloading frequency reduction condition, judging whether the running frequency F of the compressor is less than or equal to the minimum running frequency Fmin or not,
s204-1, when the compressor running frequency F is less than or equal to the minimum running frequency Fmin, controlling the compressor to run at the minimum running frequency Fmin;
s204-2, when the compressor running frequency F is larger than the minimum running frequency Fmin, controlling the compressor frequency to continuously reduce, and through the steps, preventing the compressor from being started and stopped frequently after the compressor is lowered to standby.
S205, if the unit meets the unloading frequency limiting condition, judging whether the water temperature frequency reducing condition is met, namely the actual outlet water temperature TMeasured in factWhether the absolute value of the difference with the preset outlet water temperature Tc is less than or equal to a first preset value △ T1;
s205-1, if the water temperature frequency reduction condition is met, controlling the frequency of the compressor to continuously reduce, and controlling the frequency of the compressor to reduce in a water temperature judging mode at the moment so as to prevent the system from being damaged for a long time when the frequency of the system is limited in a high-load state;
s205-2, if the water temperature frequency reduction condition is not met, controlling the frequency of the compressor to be kept unchanged, and keeping the current running frequency of the compressor at the moment to prevent the running pressure of the system from being increased continuously.
When the unit appears in unloading limit frequency under higher frequency, even if the water temperature frequency reduction condition is met, the frequency can not be reduced continuously, but the pressure of high-load operation of the unit is relieved by reducing the frequency of the compressor, so that the unit can operate more stably.
In addition, after the unit normally operates, if unloading frequency reduction conditions such as high pressure or low pressure are met all the time, the frequency of the compressor is reduced all the time, when the frequency of the compressor is reduced to 0, the unit closes the compressor to enter a standby state, the compressor can be started again to operate at the lowest frequency when the starting condition is met, the compressor is started for a period of time and then reduced to standby, the compressor is frequently started and stopped all the time, and the compressor can be kept to operate at the minimum operating frequency and cannot be frequently started and stopped after the frequency of the compressor is reduced to the minimum operating frequency by setting the minimum operating frequency.
Example 3
Fig. 3 is a structural view of a frequency control apparatus of a compressor according to another embodiment of the present invention, as shown in fig. 3, the apparatus including:
the judging module 11 is used for judging whether the unit is unloaded;
the water temperature frequency control module 12 is used for executing water temperature frequency control operation when the compressor is in an unloading frequency limiting state;
and the frequency reduction control module 13 is used for executing frequency reduction control operation when the compressor is in an unloading frequency reduction state.
Since whether the compressor is unloaded is closely related to the discharge pressure of the compressor, and the discharge pressure of the compressor exceeds a certain value, the unloading may be caused, and in order to achieve accurate determination, whether the compressor is unloaded may be determined by the discharge pressure of the compressor, and therefore, in specific implementation, as shown in fig. 4, the determining module 11 includes: an unloading judgment unit 111 for comparing the compressor discharge pressure value with a first pressure threshold value; when the exhaust pressure value of the compressor is smaller than a first pressure threshold value, judging that the unit is not unloaded; and when the discharge pressure value of the compressor is greater than or equal to the first pressure threshold value, judging that the unit has unloading.
In order to further determine the operating state of the compressor, the determining module 11 further includes:
a state judgment unit 112, configured to compare the compressor discharge pressure value with a second pressure threshold; when the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, judging that the compressor is in an unloading frequency limiting state; and when the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value.
After the discharge pressure value of the compressor exceeds the unloading pressure value, the frequency of the compressor cannot be increased any more, and at this time, the compressor is in the unloading frequency limiting state, and after the discharge pressure value of the compressor is increased to a certain value, the frequency of the compressor needs to be controlled to be reduced, and at this time, the compressor enters the unloading frequency reducing state, so that the state judgment unit 112 can judge that the compressor is in the unloading frequency reducing state or the unloading frequency limiting state by judging the pressure value.
In an actual operation process, the larger the difference between the actual outlet water temperature of the evaporator and the preset temperature is, the larger the described working load of the compressor is, in order to meet the load demand, the frequency of the compressor needs to be adjusted according to the difference between the actual outlet water temperature and the preset temperature, therefore, in order to realize the frequency control of the compressor in the unloading frequency limiting state, as shown in fig. 4, in some embodiments, the water temperature frequency control module 12 includes: a first calculating unit 121, configured to calculate an absolute value of a difference between an actual outlet water temperature of the evaporator and a preset outlet water temperature; a first processing unit 122 for controlling the compressor frequency to decrease when the absolute value is less than or equal to a first preset value; and when the absolute value is greater than a first preset value, controlling the compressor to keep the current frequency.
In order to avoid that the compressor enters the standby state after the operating frequency of the compressor is reduced to zero when the compressor is in the unloading and frequency reducing state, and the compressor is started again after the starting condition is met, which causes frequent start and stop and affects the service life of the compressor, as shown in fig. 4, the frequency reducing control module 13 includes:
the second calculating unit 131 is configured to calculate a difference between a current operating frequency of the compressor and a preset frequency when the compressor is in an unloading and frequency-reducing state; a second processing unit 132 for controlling the compressor to operate at the preset frequency when the difference value is less than or equal to zero; and when the difference value is larger than zero, controlling the compressor frequency to continuously reduce.
In order to realize the frequency control of the compressor without unloading, as shown in fig. 5, the apparatus further includes: a water temperature frequency modulation module 14, configured to adjust a frequency of the compressor according to an actual outlet water temperature of the evaporator and a preset outlet water temperature when a determination result of the determination module 11 is that the unit is not unloaded, specifically, the water temperature frequency modulation module 14 includes:
a third calculating unit 141, configured to calculate an absolute value of a difference between an actual outlet water temperature of the evaporator and a preset outlet water temperature;
a third processing unit 142 for controlling the compressor frequency to decrease when the absolute value is less than or equal to a first preset value; when the absolute value is greater than a first preset value and less than a second preset value, controlling the compressor to keep the current frequency; and when the absolute value is greater than or equal to a second preset value, controlling the frequency of the compressor to rise, wherein the second preset value is greater than the first preset value.
Through the compressor frequency control device of this embodiment, when the unit uninstalls the limit frequency under higher frequency, through judging evaporimeter leaving water temperature, the control compressor continues to slow down the frequency, makes the unit uninstall the limit frequency under higher frequency, but can continue to slow down the frequency when evaporimeter leaving water temperature satisfies the condition of slowing down the frequency, is favorable to alleviating the pressure of unit high load operation, guarantees the more stable operation of unit.
Example 4
The present embodiment provides an apparatus comprising the compressor frequency control device in the above embodiments.
Example 5
The invention also provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program realizes the above-mentioned method when executed by a processor.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (16)
1. A method of controlling a frequency of a compressor, the method comprising:
judging whether the unit is unloaded or not;
if the unit is unloaded, further judging that the compressor is in an unloading frequency limiting state or an unloading frequency reducing state;
if the compressor is in the unloading frequency limiting state, executing water temperature frequency control operation; if the compressor is in the unloaded down-conversion state, the down-conversion control operation is performed.
2. The method of claim 1, wherein after determining whether the crew is unloaded, the method further comprises:
and if the unit is not unloaded, adjusting the frequency of the compressor according to the actual outlet water temperature and the preset outlet water temperature of the evaporator.
3. The method of claim 2, wherein adjusting the frequency of the compressor based on the actual leaving water temperature of the evaporator and the preset leaving water temperature comprises:
calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
controlling the compressor frequency to decrease if the absolute value is less than or equal to a first preset value;
if the absolute value is greater than a first preset value and less than a second preset value, controlling the compressor to keep the current frequency;
if the absolute value is greater than or equal to a second preset value, controlling the frequency of the compressor to increase;
wherein the second preset value is greater than the first preset value.
4. The method of claim 1, wherein if the compressor is in an unloaded frequency limited state, performing a water temperature frequency control operation comprises:
calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
if the absolute value is less than or equal to a first preset value, controlling the frequency of the compressor to be reduced;
and if the absolute value is greater than a first preset value, controlling the compressor to keep the current frequency.
5. The method of claim 1, wherein if the compressor is in the unloaded down conversion state, performing a down conversion control operation comprises:
comparing the current operating frequency of the compressor with a preset frequency;
if the current running frequency of the compressor is less than or equal to the preset frequency, controlling the compressor to run at the preset frequency;
and if the current running frequency of the compressor is greater than the preset frequency, controlling the frequency of the compressor to continuously reduce.
6. The method of claim 1, wherein determining whether the crew is unloaded comprises:
depending on the compressor discharge pressure value, or,
the value of the compressor operating current, or,
and judging whether the unit is unloaded or not according to the working voltage value of the compressor.
7. The method of claim 6, wherein determining whether the unit is unloaded based on the compressor discharge pressure value comprises:
comparing the compressor discharge pressure value with a first pressure threshold value;
if the exhaust pressure value of the compressor is smaller than the first pressure threshold value, judging that the unit is not unloaded;
and if the discharge pressure value of the compressor is greater than or equal to the first pressure threshold value, judging that the unit has unloading.
8. The method of claim 7, wherein determining whether the compressor is in the unloaded frequency limited state or the unloaded frequency reduced state comprises:
comparing the compressor discharge pressure value with a second pressure threshold value;
if the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, the compressor is judged to be in an unloading frequency limiting state;
and if the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value.
9. A compressor frequency control apparatus, characterized in that the apparatus comprises:
the judging module is used for judging whether the unit is unloaded; if the unit is unloaded, the compressor is further judged to be in an unloading frequency limiting state or an unloading frequency reducing state;
the water temperature frequency control module is used for executing water temperature frequency control operation when the compressor is in an unloading frequency limiting state;
and the frequency reduction control module is used for executing frequency reduction control operation when the compressor is in an unloading frequency reduction state.
10. The apparatus of claim 9, further comprising:
and the water temperature frequency modulation module is used for adjusting the frequency of the compressor according to the actual outlet water temperature and the preset outlet water temperature of the evaporator under the condition that the judging result of the judging module is that the unit is not unloaded.
11. The apparatus of claim 9, wherein the water temperature frequency control module comprises:
the first calculating unit is used for calculating the absolute value of the difference between the actual outlet water temperature of the evaporator and the preset outlet water temperature;
a first processing unit for controlling the frequency of the compressor to be lowered when the absolute value is less than or equal to a first preset value; and when the absolute value is greater than a first preset value, controlling the compressor to keep the current frequency.
12. The apparatus of claim 9, wherein the downconversion control module comprises:
the second calculating unit is used for calculating the difference value between the current running frequency of the compressor and the preset frequency when the compressor is in an unloading frequency reduction state;
the second processing unit is used for controlling the compressor to operate at the preset frequency when the difference value is less than or equal to zero; and when the difference value is larger than zero, controlling the compressor frequency to continuously reduce.
13. The apparatus of claim 9, wherein the determining module comprises:
the unloading judgment unit is used for comparing the exhaust pressure value of the compressor with a first pressure threshold value; when the exhaust pressure value of the compressor is smaller than a first pressure threshold value, judging that the unit is not unloaded; and when the discharge pressure value of the compressor is greater than or equal to the first pressure threshold value, judging that the unit has unloading.
14. The apparatus of claim 13, wherein the determining module further comprises:
the state judgment unit is used for comparing the exhaust pressure value of the compressor with a second pressure threshold value; when the discharge pressure value of the compressor is smaller than or equal to the second pressure threshold value, judging that the compressor is in an unloading frequency limiting state; and when the discharge pressure value of the compressor is greater than a second pressure threshold value, determining that the compressor is in an unloading frequency reduction state, wherein the second pressure threshold value is greater than the first pressure threshold value.
15. An apparatus, characterized by comprising the compressor frequency control device of any one of claims 9 to 14.
16. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 8.
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| CN113959049A (en) * | 2021-10-08 | 2022-01-21 | 珠海格力电器股份有限公司 | Noise improvement control method for high-load shedding and variable-frequency air conditioning system |
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| CN110905791B (en) | 2020-10-02 |
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