CN111156748B - Variable frequency air conditioner limiting power control method, storage medium and air conditioner - Google Patents
Variable frequency air conditioner limiting power control method, storage medium and air conditioner Download PDFInfo
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- CN111156748B CN111156748B CN201911357173.8A CN201911357173A CN111156748B CN 111156748 B CN111156748 B CN 111156748B CN 201911357173 A CN201911357173 A CN 201911357173A CN 111156748 B CN111156748 B CN 111156748B
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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
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F24F2110/12—Temperature of the outside air
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Abstract
The invention provides a power limiting control method for a variable frequency air conditioner, a storage medium and an air conditioner. The frequency reduction is controlled by detecting the current, when the frequency reduction reaches the lowest frequency and the operation still does not meet the requirement, the total energy consumption of the compressor in the operation of the minimum frequency is equal to the total energy consumption required by the power reduction mode within the specified time, the total time that the compressor is stopped for one time is calculated, the compressor is prevented from being started and stopped for many times, and the comfort of a user and the reliability of the compressor are improved.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a variable frequency air conditioner power limiting control method, a storage medium and an air conditioner.
Background
At present, the market has a mandatory limit requirement on the operation power of the air conditioner, and the mandatory limit requirement is taken as a necessary condition for the admission of air conditioner products in a legal or standard form. For example, the air conditioner is input with a control signal through a specific device, and the total energy consumption of the air conditioner in a period of time in response to the signal cannot exceed K% of the normal operation under the same working condition. The current common practice is to take the nominal rated power of the air conditioner as a reference, and reduce the power of the air conditioner according to the percentage on the reference. This approach has the following problems: 1) the normal operation power under the low-load working condition is far lower than the nominal rated power, and K% of the nominal rated power is still adopted to reduce the power, so that the regulation or the standard of the air conditioner market cannot be met; 2) the normal operation power under the overload working condition is far higher than the nominal rated power, the power when the operation frequency of the compressor is reduced to the lower limit value of the frequency operation is still larger than K% of the nominal rated power, the operation of the air conditioner can only be forcibly closed, the power after the air conditioner is stopped meets K% lower than the nominal rated power, and then the air conditioner is started to operate, so that the comfort of a user is influenced by frequent starting and stopping; 3) the system is started again after stopping for 3 minutes under the general condition, then the machine type can be repeatedly started and stopped, and the comfort of a user is influenced by frequent starting and stopping.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for controlling the limited power of a variable frequency air conditioner, which solves the problems that when an air conditioner compressor is operated in a power reduction mode, the power of the compressor with the frequency reduced to the minimum operation frequency still does not meet the requirement of power reduction, and the variable frequency air conditioner needs to be frequently started and stopped.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for controlling the power limitation of a variable frequency air conditioner comprises the steps of detecting the current of the whole air conditioner in real time to obtain a current value after the air conditioner is started to operate, judging whether the air conditioner needs to operate in a frequency reduction mode or not by analyzing the current value of the whole air conditioner, calculating the shutdown time which can actually meet the requirement of the shutdown power by recording the current value of the minimum operation frequency after the frequency reduction under the condition that the compressor frequency of the air conditioner is reduced to the minimum frequency and the requirement of the shutdown power cannot be met, and controlling the compressor to be shut down according to the shutdown time. The frequency reduction is controlled by detecting the current, when the frequency reduction reaches the lowest frequency and the operation still does not meet the requirement, the total energy consumption of the compressor in the operation of the minimum frequency is equal to the total energy consumption required by the power reduction mode within the specified time, the total time that the compressor is stopped for one time is calculated, the compressor is prevented from being started and stopped for many times, and the comfort of a user and the reliability of the compressor are improved.
Further, the specific step of judging whether the air conditioning unit needs to operate in a frequency reduction mode by analyzing the current value of the whole air conditioning unit is as follows: and detecting the current of the whole air conditioner to obtain a current value I, and if I is less than or equal to I1 × K%, operating the air conditioner unit in a normal mode, wherein I1 is a preset rated current threshold value, and K is a preset proportionality constant. The current value of the whole machine detected in real time is used as the standard for judging whether the frequency reduction operation is performed or not, the control accuracy of the frequency reduction action is improved while the current operation state can be fed back in time, the frequency reduction action is ensured to be entered only when the condition is met, and the misjudgment is avoided.
Further, the specific step of judging whether the air conditioning unit needs to operate in a frequency reduction mode by analyzing the current value of the whole air conditioning unit is as follows: detecting the current of the whole machine to obtain a current value I, if I is more than I1K%, reducing the operation frequency of the compressor by delta F within each delta T time based on the current operation frequency, updating the target frequency at the same time, and operating the compressor according to the current frequency until I is less than or equal to I1K%, wherein the delta T is a preset time value, and the delta F is a preset frequency value. When the current value of the whole air conditioning unit is larger than the current threshold value multiplied by the proportionality coefficient, the fact that the current air conditioning unit needs to operate in a frequency reduction mode is shown, the same operation frequency is reduced within the same time, and the stability of the operation of the air conditioning unit is guaranteed.
Further, the setting of the rated current threshold specifically includes: the method comprises the steps of detecting the outdoor environment temperature and the operation mode of the air conditioning unit, dividing the outdoor environment temperature according to regions, and determining the current threshold according to the specific operation mode of the air conditioning unit. Different current thresholds are determined according to different environmental conditions, so that more accurate judgment is ensured, the application range of the air conditioner is expanded, and the air conditioner is suitable for more air conditioner types and more complex environmental conditions.
Further, the calculating the downtime that can actually meet the requirement of the shutdown power specifically includes: recording the current value I of the minimum operating frequency after frequency reductionminCalculating IminDifference Δ I from I1 × K%, downtime t =Δi/IminTh, wherein Th is a predetermined time value. And calculating the shutdown time by using the difference value between the current value of the minimum operating frequency and the rated current threshold value so as to meet the requirement that the total energy consumption of the compressor in the minimum operating frequency, in which the whole machine current is operated in the Th-t time, is equal to the total energy consumption of the whole machine current which is operated at the rated current threshold value K percent and Th.
Further, the controlling the compressor to stop according to the stop time specifically includes: and detecting and acquiring a limited power time t1, and when t1 is greater than Th-t, starting the shutdown of the compressor. The air conditioner complete machine can meet the requirement of reducing power within a specified time, and the compressor is stopped only once, so that the repeated start and stop of the compressor are avoided.
Further, the controlling the compressor to stop according to the stop time specifically includes: and detecting and acquiring limited power time t1, and when t1= Th, the air conditioning unit exits the limited power control and resumes normal operation.
Further, the relationship between the preset time value Δ T and the preset frequency value Δ F is specifically: Δ T =Δf a, where a is a preset constant value.
A storage medium for storing a computer program, the computer program implementing the limit power control method of the inverter air conditioner as described in any one of the above when being invoked by a processor.
An air conditioner comprising a processor and a memory for storing a computer program that when invoked by the processor implements the inverter air conditioner limit power control method of any of the above.
The variable frequency air conditioner limiting power control method, the storage medium and the air conditioner provided by the invention have the beneficial effects that: when the air conditioner compressor operates in reduced power, the power of the compressor with the frequency reduced to the minimum operating frequency still does not meet the requirement of reduced power, the total energy consumption of the compressor operating in the minimum frequency is equal to the total energy consumption required by a reduced power mode within the specified time, the total time that the compressor is stopped once is calculated, the compressor is prevented from being started and stopped for many times, and the user comfort and the compressor reliability are improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example 1: a method for controlling the limited power of a variable frequency air conditioner.
As shown in fig. 1, a method for controlling the limited power of an inverter air conditioner includes the following steps:
step 1: and reading the outdoor environment temperature T outer ring and the running mode of the air conditioner.
Step 2: according to the outdoor environment temperature and the air conditioner operation mode, the environment temperature is divided according to regions, the divided regions can be adjusted according to specific experiments, the rated power values are classified into the same interval in a relatively close mode, and the situation that the difference value of the rated power values measured in the same interval is large is avoided. The method comprises the following specific steps:
when the outer ring of T is less than-6 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 13.4A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 4.5A;
when the temperature of the T outer ring is more than or equal to minus 6 ℃ and less than minus 1 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 12.8A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 4.5A;
when the temperature of the outer ring is more than or equal to minus 1 ℃ and less than 4 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 12.5A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 4.3A;
when the temperature T is more than or equal to 4 ℃ and the outer ring is less than 9 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 11.2A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 4.2A;
when the temperature of the T outer ring is more than or equal to 9 ℃ and less than 15 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 10.0A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 3.9A;
when the temperature T is more than or equal to 15 ℃ and the outer ring is less than 22 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 7.2A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 6.4A;
when the temperature is more than or equal to 22 ℃ and the outer ring is less than 25 ℃, the air conditioner operation mode is a heating mode, the rated current threshold value is 5.7A, the air conditioner operation mode is a non-heating mode, and the rated current threshold value is 7.2A;
when the temperature T is more than or equal to 25 ℃ and the outer ring is less than 29 ℃, the air conditioner operation mode is a non-heating mode, and the rated current threshold is 8.7A;
when T is more than or equal to 29 ℃ and the outer ring is less than 38 ℃, the air conditioner operation mode is a non-heating mode, and the rated current threshold is 10.6A.
And step 3: and under the normal operation of the air conditioner, the full load operation power value of each interval and different mode conditions is actually measured according to experiments. The available power value is used as the rated power of the current region, and the power can be converted into the rated current value under the rated voltage to be used as the nominal rated value.
And 4, step 4: reads and interprets the information transmitted from the limit power generating device to determine the ratio K of the power down (K is in the range of [0, 100 ]). Once the power limiting device does not send a signal, the air conditioner exits the power limiting control and executes the power limiting control according to normal operation. The power limiting generation device can be an air conditioner remote controller, a wireless WIFI, a power carrier signal and other signal sending devices.
And 5: and judging the magnitude relation between the current I of the whole air conditioner and the rated current threshold value I1K%.
5.1 when I is less than or equal to I1 xK%, the air conditioner operates according to the normal operation mode.
5.2 when I > I1 × K%, the compressor operating frequency is decreased by Δ F per Δ T time based on the current operating frequency while updating the forget frequency: f target frequency = F current operating frequency- Δ F. If the limited power arrives, the compressor is in a leveling state, the current operation frequency is 50HZ, the target of normal operation is 70HZ, and I is greater than I1K%, the target frequency of the compressor is immediately updated to be F target frequency = F current operation frequency-delta F =50-5=45HZ, and the delay delta T = delta F2 =10S is used for judging whether the overall machine current I is greater than I1K again. If the current I is still greater than I1 × K%, the target frequency of the compressor is immediately updated to F target frequency = F current operating frequency- Δ F =45-5=40HZ, and the time delay Δ T = Δ F × 2=10S is used to determine again whether the current I is greater than I1 × K%. If the current I of the whole machine is less than or equal to I1 xK%. The F target frequency =40HZ is stably operated until the transmission signal of the power limiting signal device or the I1 is changed, and the process returns to the step 4 to judge again.
Step 6: when the target frequency F is reduced to the minimum frequency allowed by the compressor, the current I of the whole machine is still larger than I1 xK%. At the moment, the required stop time is calculated, so that the requirements of reducing power can be met, and repeated starting and stopping can be avoided. The current value of the minimum operating frequency after the frequency is reduced is recorded, and the shutdown time t which can actually meet the requirement of the shutdown power is calculated, so that the whole air conditioner can meet the requirement of the power reduction within the specified time, the compressor is stopped once, and the repeated start and stop of the compressor are avoided.
6.1 recording I at minimum operating frequency of compressorminDifference Δ I from I1 × K%.
6.2 calculating the time of the complete machine needing to be stopped in the Th time: t = Δ I/IminTh. satisfying I of compressor running at minimum running frequencyminThe total energy consumption in Th-t is equal to the total energy consumption of running Th with the current of the whole machine I1K%.
6.3, detecting and acquiring limited power time t1, when t1 is greater than Th-t, stopping the compressor, when t1= Th, the complete machine quits the limited power control, the complete machine restores to normal operation, and whether the complete machine enters the limited power mode to operate is judged again.
Example 2: a storage medium.
A storage medium for storing a computer program, wherein when the computer program is called by a processor, the method for limiting power of an inverter air conditioner in embodiment 1 is implemented.
Example 3: an air conditioner.
An air conditioner comprising a processor and a memory, wherein the memory is used for storing a computer program, and the computer program realizes the limit power control method of the variable frequency air conditioner in the embodiment 1 when being called by the processor.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (9)
1. A method for controlling the limited power of a variable frequency air conditioner is characterized in that after an air conditioning unit is started to operate, the current of the whole air conditioner is detected in real time to obtain a current value, whether the air conditioning unit needs to operate in a frequency reduction mode or not is judged by analyzing the current value of the whole air conditioner, and when the frequency of a compressor of the air conditioning unit is reduced to the minimum frequency and still cannot meet the power reduction requirement, the frequency reduction is recordedCalculating the actual shutdown time which can meet the requirement of shutdown power according to the current value of the minimum operating frequency after the rate, and controlling the compressor to be shut down according to the shutdown time; the calculation of the actual downtime meeting the requirement of the shutdown power specifically comprises the following steps: recording the current value I of the minimum operating frequency after frequency reductionminCalculating IminDifference Δ I from I1 × K%, and downtime t ═ Δ I/IminTh, wherein Th is a predetermined time value.
2. The method for controlling the limited power of the inverter air conditioner according to claim 1, wherein the step of judging whether the air conditioning unit needs to operate in a frequency-reducing mode by analyzing the current value of the whole unit is specifically as follows: and detecting the current of the whole air conditioner to obtain a current value I, and if I is less than or equal to I1 × K%, operating the air conditioner unit in a normal mode, wherein I1 is a preset rated current threshold value, and K is a preset proportionality constant.
3. The method for controlling the limited power of the inverter air conditioner according to claim 1, wherein the step of judging whether the air conditioning unit needs to operate in a frequency-reducing mode by analyzing the current value of the whole unit is specifically as follows: detecting the current of the whole machine to obtain a current value I, if I is more than I1K%, reducing the operation frequency of the compressor by delta F within each delta T time based on the current operation frequency, updating the target frequency at the same time, and operating the compressor according to the current frequency until I is less than or equal to I1K%, wherein the delta T is a preset time value, the delta F is a preset frequency value, I1 is a preset rated current threshold value, and K is a preset proportionality constant.
4. The inverter air conditioner limiting power control method according to claim 2 or 3, wherein the rated current threshold is specifically set as follows: the method comprises the steps of detecting the outdoor environment temperature and the operation mode of the air conditioning unit, dividing the outdoor environment temperature according to regions, and determining the current threshold according to the specific operation mode of the air conditioning unit.
5. The inverter air conditioner limiting power control method according to claim 1, wherein the controlling the compressor to stop according to the stop time is specifically: and detecting and acquiring a limited power time t1, and when t1 is greater than Th-t, starting the shutdown of the compressor.
6. The inverter air conditioner limiting power control method according to claim 1, wherein the controlling the compressor to stop according to the stop time is specifically: and detecting and acquiring limited power time t1, and when t1 is Th, the air conditioning unit exits the limited power control and resumes normal operation.
7. The inverter air conditioner limiting power control method according to claim 3, wherein the relationship between the preset time value Δ T and the preset frequency value Δ F is specifically: Δ T ═ Δ F × a, where a is a preset constant value.
8. A storage medium for storing a computer program, wherein the computer program, when being invoked by a processor, implements the inverter air conditioner limit power control method according to any one of claims 1 to 7.
9. An air conditioner comprising a processor and a memory for storing a computer program, wherein the computer program when invoked by the processor implements the inverter air conditioner limit power control method of any of claims 1-7.
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