CN104110775B - Frequency-conversion air conditioner operation control method and device - Google Patents
Frequency-conversion air conditioner operation control method and device Download PDFInfo
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Abstract
The invention belongs to the technical field of air conditioner controlling and provides a frequency-conversion air conditioner operation control method and device. The frequency-conversion air conditioner operation control method includes: acquiring a frequency threshold; judging whether a shutdown instruction is received or not during operation of a compressor, and judging whether current operation frequency of the compressor is larger than the frequency threshold or not when the shutdown instruction is received; if yes, reducing operation frequency of the compressor according to preset frequency reduction rate and continuously judging whether the current operation frequency of the compressor is larger than the frequency threshold or not, if not, controlling an inverter to stop outputting. Therefore, the operation frequency of the compressor can be sustained in the preset frequency threshold during shutdown, problems about voltage overshoot of a direct-current bus and overlarge stress impact upon a system pipeline when the compressor is shut down during high-frequency operation are solved, reliability of the high-frequency-conversion air conditioner can be beneficially improved, and service lives of internal electronic devices and cooling/heating system components of the frequency-conversion air conditioner can be favorably prolonged.
Description
Technical field
The invention belongs to air conditioner controlling technology field, more particularly, to a kind of convertible frequency air-conditioner progress control method and device.
Background technology
With the continuous development of modern convertible frequency air-conditioner technology, people get over to the comfortableness of convertible frequency air-conditioner and the requirement of energy saving
Come higher.In order to improve the Energy Efficiency Ratio of convertible frequency air-conditioner, people often improve compression using the higher compressor of back electromotive-force constant
The efficiency of machine.In addition, it is desirable to frequency-changeable compressor runs the refrigerating/heating effect to improve convertible frequency air-conditioner with higher frequency
Really, thus meeting the comfortableness demand of people's fast-refrigerating/heat.When compressor is run with upper frequency, if received
Halt instruction, then all inverters of compressor controller will stop output, and the effect due to inertia, stop defeated in inverter
When going out, compressor also can with higher frequency run for a period of time, and now compressor electric motor terminal voltage is by the anti-electricity according to motor
Potential constant re-establishes, as shown in figure 1, the crest voltage of compressor electric motor terminal voltage（I.e. E in Fig. 1PEAK）With compressor
Operating frequency F when back electromotive-force constant Ke and shutdown is directly proportional.After the back-emf of the motor of compressor is set up, can be to change
Electric capacity on the dc bus of frequency air-conditioner controller charges and makes its voltage reach a high magnitude of voltage, power device and
Bus capacitor all may be damaged because of overvoltage under this magnitude of voltage.
The damage to device for the dc bus overvoltage leading in order to avoid compressor is shut down in high frequency running,
Prior art provides a kind of urgent bus over voltage protection method, and it passes through to detect DC bus-bar voltage, finds dc bus
When voltage exceedes rotection thresholds, inverter is controlled to enter zero vector output state so that motor rotating energy consumes in motor
Portion, prevents the charging to dc-link capacitance, thus reaching the purpose that suppression DC bus-bar voltage raises.However, it is above-mentioned
Urgent bus over voltage protection method belongs to passive type protection, that is, detect DC bus-bar voltage too high when just take measures into
Row voltage suppresses, and in the case that compressor operating frequency and back electromotive-force constant are all very high, is still difficult to avoid that dc bus
Voltage overshoot, so or power device can be caused with a certain degree of impact, the life and reliability of power device is produced
Detrimental effect.
Additionally, compressor is in high frequency running, in rotor and system pipeline, the energy of coolant flowing is very big, so
Stop moment, the pressure in compressor and system pipeline and flow are undergone mutation, and make compressor and system pipeline generation very big
Stress impact, this has a negative impact to the life and reliability of compressor and system pipeline.
In sum, prior art presence cannot solve convertible frequency air-conditioner and shut down brought direct current in high frequency running
The problem that busbar voltage is too high and system pipeline stress is excessive.
Content of the invention
The invention provides a kind of convertible frequency air-conditioner progress control method is it is intended to solve cannot solve existing for prior art
The brought problem that DC bus-bar voltage is too high and system pipeline stress is excessive shut down in high frequency running by convertible frequency air-conditioner.
The present invention is achieved in that a kind of convertible frequency air-conditioner progress control method, described convertible frequency air-conditioner progress control method
Comprise the following steps：
A. obtain frequency threshold；
B. judge whether to receive halt instruction during compressor operating, be, then execution step C, no, then return institute
State step B；
C. judge whether the current operation frequency of described compressor is more than described frequency threshold, be, then execution step D, no,
Then execution step E；
D. according to the running frequency of compressor described in default frequency reducing rate reduction, and return described step C；
E. inverter is controlled to stop output.
Another object of the present invention also resides in a kind of convertible frequency air-conditioner operating control device of offer, and described convertible frequency air-conditioner runs control
Device processed includes：
Frequency threshold acquisition module, for obtaining frequency threshold；
Shut down judge module, for judging whether to receive halt instruction during compressor operating, and judge knot
Fruit continues to determine whether to receive halt instruction when being no；
Frequency judge module, for when the described judged result shutting down judge module is to be, judging described compressor
Whether current operation frequency is more than described frequency threshold；
Running frequency adjusting module, for when the judged result of described frequency judge module is for being, according to default frequency reducing
The running frequency of compressor described in rate reduction, and drive described frequency judge module work；
Inverter control module, for when the judged result of described frequency judge module is no, controlling inverter to stop
Output.
The present invention passes through to obtain frequency threshold, judges whether to receive halt instruction, when connecing during compressor operating
When receiving halt instruction, judge whether the current operation frequency of compressor is more than frequency threshold, if it is, according to default frequency reducing
The running frequency of compressor described in rate reduction continuing judges whether the current operation frequency of compressor is more than frequency threshold, such as
Really no, then control inverter to stop output it is achieved that control its running frequency to be maintained at set frequency in compressor shutdown
Rate threshold value, solves compressor and shuts down led to dc bus in high frequency running and voltage overshoot and system pipeline
By the problem of excessive stress impact, it is favorably improved the reliability of convertible frequency air-conditioner and extends convertible frequency air-conditioner internal electron device
Part and the life-span of cooling/heating system part.
Brief description
Fig. 1 is the relation curve of back-emf peak value and the operating frequency when shutting down for the compressor of existing convertible frequency air-conditioner
Figure；
Fig. 2 is the flowchart of convertible frequency air-conditioner progress control method provided in an embodiment of the present invention；
Fig. 3 is the flowchart of step S1 in convertible frequency air-conditioner progress control method provided in an embodiment of the present invention；
Fig. 4 is that the compressor involved by the instantiation in the embodiment of the present invention directly stops when running frequency is for 140Hz
DC bus-bar voltage caused by machine and the oscillogram of compressor phase current；
Fig. 5 be involved by the instantiation in the embodiment of the present invention through convertible frequency air-conditioner progress control method to compressor
After running frequency is controlled, the oscillogram of DC bus-bar voltage and compressor phase current；
Fig. 6 is the structure chart of convertible frequency air-conditioner operating control device provided in an embodiment of the present invention；
Fig. 7 is the inside of the frequency threshold acquisition module in convertible frequency air-conditioner operating control device provided in an embodiment of the present invention
Structure chart.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention is passed through to obtain frequency threshold, judges whether that receiving shutdown refers to during compressor operating
Order, when receiving halt instruction, judges whether the current operation frequency of compressor is more than frequency threshold, if it is, according to
The running frequency of compressor described in default frequency reducing rate reduction and continue to judge compressor current operation frequency whether big
In frequency threshold, if it is not, then controlling inverter to stop output it is achieved that control its running frequency to keep in compressor shutdown
In set frequency threshold, it is to avoid compressor shut down in high frequency running and make dc bus occur voltage overshoot and
System pipeline is subject to excessive stress impact, is effectively improved the reliability of convertible frequency air-conditioner and extends inside convertible frequency air-conditioner
Electronic device and the life-span of cooling/heating system part.
What Fig. 2 showed convertible frequency air-conditioner progress control method provided in an embodiment of the present invention realizes flow process, for the ease of saying
Bright, illustrate only part related to the present invention, details are as follows：
In step sl, obtain frequency threshold.
Specifically, as shown in figure 3, step S1 specifically includes following steps：
S11. the safe voltage value according to dc bus obtains stop safe frequency；
S12. according to described stop safe FREQUENCY CONTROL compressor operating prefixed time interval, in this prefixed time interval knot
Control compressor shutdown after bundle and detect the maximum voltage value of dc bus；
S13. judge whether described maximum voltage value is more than described safe voltage value, be, then execution step S14, no, then hold
Row step S15；
S14. reduce described stop safe frequency according to predeterminated frequency changing value, and return to step S12；
S15. according to described stop safe FREQUENCY CONTROL compressor operating prefixed time interval, terminate in prefixed time interval
Control the maximum stress value of compressor shutdown detecting system pipeline afterwards；
S16. judge whether described maximum stress value is more than safe stress value, be, then execution step S17, no, then execute step
Rapid S18；
S17. reduce described stop safe frequency according to described predeterminated frequency changing value, and return to step S15；
S18. using described stop safe frequency as frequency threshold.
Further, step S11 is specially：
Stop safe frequency is calculated according to following formula：
Wherein, FUSFor stop safe frequency, the i.e. compressor corresponding when the voltage of dc bus is safe voltage value
In the running frequency shutting down the moment；USSafe voltage value for dc bus（Unit is V）, it is according to the electricity on dc bus
The pressure determination of sub- device；Ke is the back electromotive-force constant of compressor, and its unit is V/Krpm.
In addition, it is necessary to explanation, the span of prefixed time interval is (0,60min), and min is minute；Default frequency
Rate changing value is the frequency values of stop safe frequency required reduction each time, and its span is (1Hz, 10Hz)；Safety should
Force value refers to stress maximum in the case of not being subject to excessive stress impact for the system pipeline（Unit is Mpa）, it is by system material
Intensity determine.
In step s 2, judge whether to receive halt instruction during compressor operating, be, then execution step S3,
No, then return to step S2.
Wherein, halt instruction includes but is not limited to shutdown command, the change that user is sent by remote control or guidance panel
Various protection halt instructions that frequency controller sends according to running state of air conditioner and reach warm halt instruction（I.e. in refrigerating/heating
Temperature reaches the halt instruction being sent during the temperature value set by user）.
In step s3, judge whether the current operation frequency of compressor is more than frequency threshold, be, then execution step S4,
No, then execution step S5.
In step s 4, according to the running frequency of default frequency reducing rate reduction compressor, and return to step S3.
Wherein, default frequency reducing speed is compressor in the unit interval（1 second）The frequency values of interior required reduction, its unit is
Hz/s, its span is [1Hz/s, 10Hz/s], and the value of default frequency reducing speed is according to the power of convertible frequency air-conditioner and load feelings
Condition determines, mainly occurs without a height of principle of liter with the voltage ensureing system stable operation and dc bus during frequency reducing and enters
Row determines.
In step s 5, inverter is controlled to stop output.
Below in conjunction with instantiation, above-mentioned convertible frequency air-conditioner progress control method is described further：
Assume that the back electromotive-force constant Ke of compressor is 40V/Krpm, the maximum running frequency of compressor is FMAXFor 140Hz,
Electronic device on dc bus pressure for 400V, by safe voltage value U of dc busSValue is 310V, supply voltage
For 220V alternating voltage；According to the fatigue strength of the copper of system pipeline material, by safe stress value σ of system pipelineSValue is
43Mpa；Prefixed time interval is 30 minutes.
According to the computing formula of compressor back-emf peak value, back-emf peak value
Directly shut down when compressor runs according to 140Hz and will produce the back-emf that peak value is 475V, it is much larger than US=310V,
This back-emf will be charged to dc-link capacitance, and causes the voltage of dc bus to rise, because charging process is born
The impact carrying, the degree that actual DC busbar voltage rises will pass through test measurement, and Fig. 4 for compressor in running frequency is
The waveform of DC bus-bar voltage caused by directly shutting down during 140Hz and the waveform of compressor phase current, as can be seen from Figure 4, direct current
Busbar voltage highest rises to 420V, and it is more than the pressure of the electric capacity on dc bus, therefore there is device failure risk.With
When, record the maximum stress value σ when shutting down for the system pipelineMAXFor 57Mpa, it is more than safe stress value σ of system pipelineS, because
This also can make system pipeline there is reliability hidden danger.
First, according to formula（1）It is calculated stop safe frequency FUS=91Hz, rounding data simultaneously takes FUSFor 90Hz, so
Control compressor operating 30 minutes according to 90Hz afterwards, shut down and detect the maximum voltage value obtaining dc bus after 30 minutes
UMAXFor 310V, due to USFor 310V（I.e. UMAX=US）, it is unsatisfactory for UMAX>US, so controlling compressor to continue to run with 30 according to 90Hz
Minute, setting convertible frequency air-conditioner running frequency is 90Hz, and run time is 30 minutes, shuts down after 30 minutes and detects and obtains system
The maximum stress value σ of pipelineMAXFor 23Mpa, due to σS=43Mpa, is unsatisfactory for σMAX>σS, so can be using 90Hz as frequency threshold.
After determining that frequency threshold is 90Hz, if convertible frequency air-conditioner receives halt instruction in running, judge
Whether the current operation frequency of compressor is more than 90Hz, if greater than 90Hz, then according to default frequency reducing speed（As 1Hz/s）Reduce
The running frequency of compressor simultaneously continues whether to judge the current operation frequency of compressor more than 90Hz, if no more than 90Hz,
Inverter is controlled to stop output.
Convertible frequency air-conditioner is carried out run control by above-mentioned, can get dc bus voltage waveform such as Fig. 5 when shutting down
Shown, frequency-conversion air-conditioning system stable operation, the voltage of dc bus is maintained at the level of 310V, DC bus-bar voltage
Situation about rising, efficiently avoid dc bus and voltage overshoot, and obtain the maximum when shutting down for the system pipeline simultaneously
Stress value is 23Mpa, less than safe stress value, thus avoiding system pipeline to be subject to excessive stress impact.
Fig. 6 shows the structure of convertible frequency air-conditioner operating control device provided in an embodiment of the present invention, for convenience of description, only
Show part related to the present invention, details are as follows：
Convertible frequency air-conditioner operating control device provided in an embodiment of the present invention includes：
Frequency threshold acquisition module 100, for obtaining frequency threshold；
Shut down judge module 200, for judging whether to receive halt instruction during compressor operating, and judging
Result continues to determine whether to receive halt instruction when being no；
Frequency judge module 300, during for being to be in the judged result shutting down judge module 200, judges working as of compressor
Whether front running frequency is more than frequency threshold；
Running frequency adjusting module 400, for when the judged result of frequency judge module 300 is for being, according to default fall
The running frequency of frequency rate reduction compressor, and driving frequency judge module 300 works；
Inverter control module 500, for when the judged result of frequency judge module 300 is no, controlling inverter to stop
Only export.
Further, as shown in fig. 7, frequency threshold acquisition module 100 includes：
Frequency acquisition unit 101, obtains stop safe frequency for the safe voltage value according to dc bus；
Voltage detection unit 102, for according to described stop safe FREQUENCY CONTROL compressor operating prefixed time interval,
This prefixed time interval controls compressor shutdown after terminating and detects the maximum voltage value of dc bus；
Voltage judging unit 103, for judging whether described maximum voltage value is more than described safe voltage value；
Stress mornitoring unit 104, for when the judged result of voltage judging unit 103 is no, shutting down peace according to described
Full rate controls compressor operating prefixed time interval, controls compressor shutdown detecting system after prefixed time interval terminates
The maximum stress value of pipeline；
Stress judging unit 105, for judging whether described maximum stress value is more than safe stress value；
Frequency adjustment unit 106, for being to be or stress judging unit when the judged result of voltage judging unit 103
When 105 judged result is to be, reduce described stop safe frequency according to predeterminated frequency changing value, and driving voltage detector unit
102 or stress mornitoring unit 104 work；
Frequency threshold selectes unit 107, for when the judged result of stress judging unit 105 is no, by described shutdown
Safety frequency is as frequency threshold.
The embodiment of the present invention is passed through to obtain frequency threshold, judges whether that receiving shutdown refers to during compressor operating
Order, when receiving halt instruction, judges whether the current operation frequency of compressor is more than frequency threshold, if it is, according to
Whether the running frequency of default frequency reducing rate reduction compressor simultaneously continues to judge the current operation frequency of compressor more than frequency threshold
Value, if it is not, then control inverter to stop output it is achieved that control its running frequency to be maintained in compressor shutdown set
Frequency threshold, solve compressor and shut down led to dc bus in high frequency running voltage overshoot and system occur
Pipeline is subject to the problem of excessive stress impact, is favorably improved the reliability of convertible frequency air-conditioner and extends the internal electricity of convertible frequency air-conditioner
Sub- device and the life-span of cooling/heating system part.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of convertible frequency air-conditioner progress control method is it is characterised in that described convertible frequency air-conditioner progress control method includes following step
Suddenly：
A. obtain frequency threshold；
B. judge whether to receive halt instruction during compressor operating, be, then execution step C, no, then return described step
Rapid B；
C. judge whether the current operation frequency of described compressor is more than described frequency threshold, be, then execution step D, no, then hold
Row step E；
D. according to the running frequency of compressor described in default frequency reducing rate reduction, and return described step C；
E. inverter is controlled to stop output；
Described step A specifically includes following steps：
A1. the safe voltage value according to dc bus obtains stop safe frequency；
A2. according to described stop safe FREQUENCY CONTROL compressor operating prefixed time interval, terminate in described prefixed time interval
Control compressor shutdown afterwards and detect the maximum voltage value of dc bus；
A3. judge whether described maximum voltage value is more than described safe voltage value, be, then execution step A4, no, then execution step
A5；
A4. reduce described stop safe frequency according to predeterminated frequency changing value, and return described step A2；
A5. according to prefixed time interval described in described stop safe FREQUENCY CONTROL compressor operating, in described prefixed time interval
Control the maximum stress value of compressor shutdown detecting system pipeline after end；
A6. judge whether described maximum stress value is more than safe stress value, be, then execution step A7, no, then execution step A8；
A7. reduce described stop safe frequency according to described predeterminated frequency changing value, and return described step A5；
A8. using described stop safe frequency as frequency threshold.
2. convertible frequency air-conditioner progress control method as claimed in claim 1 is it is characterised in that the value of described prefixed time interval
Scope is (0,60min).
3. convertible frequency air-conditioner progress control method as claimed in claim 1 is it is characterised in that the taking of described predeterminated frequency changing value
Value scope is (1Hz, 10Hz).
4. convertible frequency air-conditioner progress control method as claimed in claim 1 is it is characterised in that the value of described default frequency reducing speed
Scope is [1Hz/s, 10Hz/s].
5. a kind of convertible frequency air-conditioner operating control device is it is characterised in that described convertible frequency air-conditioner operating control device includes：
Frequency threshold acquisition module, for obtaining frequency threshold；
Shut down judge module, for judging whether to receive halt instruction during compressor operating, and in judged result be
Continue to determine whether when no to receive halt instruction；
Frequency judge module, for when the described judged result shutting down judge module is to be, judging the current of described compressor
Whether running frequency is more than described frequency threshold；
Running frequency adjusting module, for when the judged result of described frequency judge module is for being, according to default frequency reducing speed
Reduce the running frequency of described compressor, and drive described frequency judge module work；
Inverter control module, for when the judged result of described frequency judge module is no, controlling inverter to stop output；
Described frequency threshold acquisition module includes：
Frequency acquisition unit, obtains stop safe frequency for the safe voltage value according to dc bus；
Voltage detection unit, for according to described stop safe FREQUENCY CONTROL compressor operating prefixed time interval, described pre-
If time interval controls compressor shutdown after terminating and detects the maximum voltage value of dc bus；
Voltage judging unit, for judging whether described maximum voltage value is more than described safe voltage value；
Stress mornitoring unit, for when the judged result of described voltage judging unit is no, according to described stop safe frequency
Control prefixed time interval described in compressor operating, control compressor shutdown after described prefixed time interval terminates and detect system
The maximum stress value on road under the overall leadership；
Stress judging unit, for judging whether described maximum stress value is more than safe stress value；
Frequency adjustment unit, for when the judged result of described voltage judging unit be or stress judging unit judgement knot
When fruit is to be, reduces described stop safe frequency according to predeterminated frequency changing value, and drive described voltage detection unit or institute
State stress mornitoring cell operation；
Frequency threshold selectes unit, for when the judged result of described stress judging unit is no, by described stop safe frequency
Rate is as frequency threshold.
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| CN201310419979.1A CN104110775B (en) | 2013-09-13 | 2013-09-13 | Frequency-conversion air conditioner operation control method and device |
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| CN106152389B (en) * | 2015-04-22 | 2019-04-16 | Tcl空调器(中山)有限公司 | Air-conditioner control method, apparatus and system |
| CN105258301A (en) * | 2015-11-17 | 2016-01-20 | 广东美的制冷设备有限公司 | Air-conditioner and control method and device for compressor in air-conditioner |
| CN106196449B (en) * | 2016-07-13 | 2019-04-09 | 广东美的制冷设备有限公司 | A kind of air-conditioning defrost enters control method for frequency, system and the air-conditioning of process |
| CN107421056B (en) * | 2017-05-04 | 2020-08-14 | 广东美的制冷设备有限公司 | Variable frequency air conditioner, shutdown control method and computer readable storage medium |
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| CN108679794B (en) * | 2018-05-17 | 2020-08-14 | 广东美的制冷设备有限公司 | Air conditioner, control method and device thereof and readable storage medium |
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| CN108490848B (en) * | 2018-05-17 | 2019-12-20 | 广东美的制冷设备有限公司 | Electric equipment, control method and control device thereof, and readable storage medium |
| CN108758968B (en) * | 2018-05-17 | 2019-08-16 | 广东美的制冷设备有限公司 | Air-conditioner control method and air conditioner |
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| CN111947360B (en) * | 2020-08-15 | 2022-04-05 | 广东芬尼克兹节能设备有限公司 | Control method, device and equipment for reducing amplitude stress of copper pipe and storage medium |
| CN112332374B (en) * | 2020-10-29 | 2022-04-19 | 珠海格力电器股份有限公司 | Overvoltage shutdown protection method and device |
| CN112524011A (en) * | 2020-11-30 | 2021-03-19 | 长虹华意压缩机股份有限公司 | Method for reducing compressor stop vibration |
| CN113251641A (en) * | 2021-04-30 | 2021-08-13 | 青岛海尔空调器有限总公司 | Compressor control method, compressor control device, compressor control apparatus, storage medium, and program product |
| CN113280488B (en) * | 2021-05-31 | 2023-04-25 | 广东美的制冷设备有限公司 | Air conditioner control method, air conditioner and computer storage medium |
| CN114234357A (en) * | 2021-12-24 | 2022-03-25 | 珠海格力电器股份有限公司 | Air conditioner self-adaptive operation and maintenance method, air conditioner and computer readable storage medium |
| CN115200186A (en) * | 2022-06-24 | 2022-10-18 | 宁波奥克斯电气股份有限公司 | Air conditioner pipeline stress control method and device and air conditioner |
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