CN106645880B - Capacitor ripple current evaluation method and device, control method for frequency conversion air conditioner and device, frequency converter and convertible frequency air-conditioner - Google Patents
Capacitor ripple current evaluation method and device, control method for frequency conversion air conditioner and device, frequency converter and convertible frequency air-conditioner Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
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Abstract
The embodiment of the invention discloses a kind of capacitor ripple current evaluation method and devices, control method for frequency conversion air conditioner and device, frequency converter and convertible frequency air-conditioner.Capacitor ripple current evaluation method, comprising: periodically acquire the busbar voltage of frequency converter DC side；Capacitance according to the busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing, determines the ripple current instantaneous value of the capacitor；According to the ripple current instantaneous value, ripple current virtual value is determined.Technical solution provided in an embodiment of the present invention estimates capacitor ripple current virtual value according to frequency converter DC side busbar voltage, realizes the ripple current for obtaining frequency converter DC side for the capacitor of pressure stabilizing.
Description
Technical field
The present embodiments relate to electronic technology more particularly to a kind of capacitor ripple current evaluation methods and device, frequency conversion
Air conditioning control method and device, frequency converter and convertible frequency air-conditioner.
Background technique
Currently, cross-straight-intersection topological structure is widely used in frequency-variable air conditioner outdoor machine controller.It is used in frequency converter DC side
Capacitor is with stable DC busbar voltage.
In realizing research process of the invention, inventor's discovery is the prior art has the following problems: under normal conditions, use
It is electrolytic capacitor in the capacitor of direct current side bus pressure stabilizing, which can undergo periodic charge and discharge, and then generate ripple current,
Ripple current is the basic reason for causing to be lost, capacitor is caused to generate heat, and capacitor fever can be such that the electrolyte of electrolytic capacitor evaporates, make
Capacitance decline, influences capacitor service life, and then impact to the normal work of transducer air conditioning.
Summary of the invention
The embodiment of the present invention provides a kind of capacitor ripple current evaluation method and device, control method for frequency conversion air conditioner and dress
It sets, frequency converter and convertible frequency air-conditioner, to realize the ripple current for obtaining frequency converter DC side for the capacitor of pressure stabilizing.
In a first aspect, the embodiment of the invention provides a kind of capacitor ripple current evaluation methods, comprising:
Periodically acquire the busbar voltage of frequency converter DC side；
Capacitance according to the busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing, determines the line of the capacitor
Wave current instantaneous value；
According to the ripple current instantaneous value, ripple current virtual value is determined.
Further, the capacitance according to the busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing, determines institute
The ripple current instantaneous value for stating capacitor includes:
Ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the busbar voltage of estimation, UdFor the busbar voltage that voltage check device detects, IestFor ripple electricity
Instantaneous value is flowed, C is the capacitance of the capacitor, L1And L2Respectively voltage feedback factor and current feedback coefficient, TsFor sampling week
Phase, k are sampling number, Udest(0) and Iest(0) value is 0；
Correspondingly, determining that ripple current virtual value includes: according to the ripple current instantaneous value
Ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value.
Second aspect, the embodiment of the invention also provides a kind of capacitor ripple currents to estimate device, comprising:
Busbar voltage obtains module, for periodically acquiring the busbar voltage of frequency converter DC side；
Ripple current instantaneous value determining module, for being used for the electricity of pressure stabilizing according to the busbar voltage and frequency converter DC side
The capacitance of appearance determines the ripple current instantaneous value of the capacitor；
Ripple current virtual value determining module, for determining ripple current virtual value according to the ripple current instantaneous value.
Further, ripple current instantaneous value determining module is specifically used for:
Ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the busbar voltage of estimation, UdFor the busbar voltage that voltage check device detects, IestFor ripple electricity
Instantaneous value is flowed, C is the capacitance of the capacitor, L1And L2Respectively voltage feedback factor and current feedback coefficient, TsFor sampling week
Phase, k are sampling number, Udest(0) and Iest(0) value is 0；
Correspondingly, ripple current virtual value determining module is specifically used for:
Ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value.
The third aspect, the embodiment of the invention provides a kind of control method for frequency conversion air conditioner, comprising:
The capacitor that frequency converter DC side is used for pressure stabilizing is obtained based on capacitor ripple current evaluation method described in first aspect
Ripple current virtual value；
According to capacitance present environment temperature and the ripple current virtual value, the power of the convertible frequency air-conditioner is controlled.
Further, according to capacitance present environment temperature and the ripple current virtual value, the convertible frequency air-conditioner is controlled
Power includes:
According to preset temperature and maximum allowable ripple current corresponding relationship, determination is corresponding with capacitance present environment temperature
Maximum allowable ripple current value；
When the ripple current virtual value be more than or equal to maximum allowable ripple current value, reduce the function of the convertible frequency air-conditioner
Rate.
Further, control method for frequency conversion air conditioner further include:
Obtain mains input current；
When the mains input current, which is more than or equal to, presets maximum allowable input current, the function of the convertible frequency air-conditioner is reduced
Rate.
Further, when the ripple current virtual value be more than or equal to maximum allowable ripple current value, reduce the frequency conversion
The power of air-conditioning includes:
When the ripple current virtual value is more than or equal to maximum allowable ripple current value, according to the ripple current virtual value
With the ratio of maximum allowable ripple current value, the power of the convertible frequency air-conditioner is reduced.
Fourth aspect, the embodiment of the invention provides a kind of convertible frequency air-conditioner control devices, comprising:
Ripple current virtual value obtains module, for estimating that device obtains by capacitor ripple current described in second aspect
Ripple current virtual value of the frequency converter DC side for the capacitor of pressure stabilizing；
Air-conditioning power control module, for controlling institute according to capacitance present environment temperature and the ripple current virtual value
State the power of convertible frequency air-conditioner.
Further, air-conditioning power control module includes:
Ripple current permissible value determination unit is used for according to preset temperature and maximum allowable ripple current corresponding relationship,
Determine maximum allowable ripple current value corresponding with current environmental temperature；
First air-conditioning power reduces unit, for being more than or equal to maximum allowable ripple current when the ripple current virtual value
Value, reduces the power of the convertible frequency air-conditioner.
Further, air-conditioning power control module further include:
Input current acquiring unit, for obtaining mains input current；
Second air-conditioning power reduces unit, for presetting maximum allowable input electricity when the mains input current is more than or equal to
When stream, the power of the convertible frequency air-conditioner is reduced.
Further, the first air-conditioning power reduces unit and is specifically used for:
When the ripple current virtual value is more than or equal to maximum allowable ripple current value, according to the ripple current virtual value
With the ratio of maximum allowable ripple current value, the power of the convertible frequency air-conditioner is reduced.
5th aspect, the embodiment of the invention also provides a kind of frequency converters, have cross-straight-intersection topological structure, and DC side is set
It is equipped with the capacitor for pressure stabilizing, further includes the estimation device of capacitor ripple current described in second aspect.
6th aspect, the embodiment of the invention also provides a kind of convertible frequency air-conditioner, including frequency converter described in the 5th aspect and
Convertible frequency air-conditioner control device described in fourth aspect.
For the present invention by obtaining frequency converter DC side busbar voltage, ripple current value of the estimation for the capacitor of pressure stabilizing is real
Now obtain ripple current of the frequency converter DC side for the capacitor of pressure stabilizing.
Detailed description of the invention
Fig. 1 is the flow chart of one of the embodiment of the present invention one control method for frequency conversion air conditioner；
Fig. 2 is the flow chart of one of the embodiment of the present invention two control method for frequency conversion air conditioner；
Fig. 3 is the voltage-current curve figure in the embodiment of the present invention two；
Fig. 4 is the flow chart of one of the embodiment of the present invention three control method for frequency conversion air conditioner；
Fig. 5 is the structural schematic diagram of one of embodiment of the present invention four capacitor ripple current estimation device；
Fig. 6 is the structural schematic diagram of one of embodiment of the present invention five convertible frequency air-conditioner control device；
Fig. 7 is the structural schematic diagram of one of the embodiment of the present invention six frequency converter；
Fig. 8 is the structural schematic diagram of one of the embodiment of the present invention seven convertible frequency air-conditioner.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of flow chart for control method for frequency conversion air conditioner that the embodiment of the present invention one provides, and the present embodiment is applicable
In control have cross-straight-intersection topological structure convertible frequency air-conditioner operation the case where, this method can by convertible frequency air-conditioner control device Lai
It executes, which can be realized that control method for frequency conversion air conditioner specifically comprises the following steps: by hardware and/or software
Step 110 obtains ripple current virtual value of the frequency converter DC side for the capacitor of pressure stabilizing.
Wherein, the frequency converter of convertible frequency air-conditioner uses cross-straight-intersection topological structure, female using capacitor stable DC in DC side
Line voltage selects the electrolytic capacitor of big capacitance under normal conditions.Capacitor for pressure stabilizing can undergo periodic charge and discharge, generate
The detection devices such as current observer estimation ripple current virtual value can be used in ripple current.
Step 120, according to capacitance present environment temperature and ripple current virtual value, control the power of convertible frequency air-conditioner.
Wherein, there is different maximum allowable ripple currents in different environment temperatures, generally, capacitive environment temperature is got over
The ripple current of height, permission is smaller.According to the ratio of ripple current virtual value and maximum allowable ripple current value, it is empty to control frequency conversion
The power of tune, it is exemplary, convertible frequency air-conditioner can be changed by adjusting modes such as the frequency of compressor and outdoor fan revolving speeds
Load controls the power of convertible frequency air-conditioner.The power for adjusting convertible frequency air-conditioner can achieve the mesh for correspondingly adjusting ripple current value
's.
The technical solution of the present embodiment is effective by obtaining ripple current of the frequency converter DC side for the capacitor of pressure stabilizing
Value, controls the power of convertible frequency air-conditioner, solves to cause the capacitor lost of life because capacitor ripple current is excessive, caused by influence to become
The problem of frequency air conditioner works normally realizes the effect for improving convertible frequency air-conditioner reliability of operation.
Embodiment two
Fig. 2 is a kind of flow chart of control method for frequency conversion air conditioner provided by Embodiment 2 of the present invention, the technology of the present embodiment
Scheme further refines based on the above technical solution, and optionally, step 110 includes:
Step 210, the busbar voltage for periodically acquiring frequency converter DC side.
Wherein, DC side busbar voltage is periodically acquired by voltage check device, due to including PFC in ripple current
(Power Factor Correction, PFC) and IPM (Intelligent Power Module, intelligent power
Module) switch high-frequency signal, sample frequency need it is sufficiently high, i.e., the sampling period need it is short enough.
Step 220, the capacitance according to busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing, determine the line of capacitor
Wave current instantaneous value.
Optionally, ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the DC bus-bar voltage of estimation, UdFor the DC bus-bar voltage that voltage check device detects, Iest
For ripple current instantaneous value, C is capacitance of the frequency converter DC side for the capacitor of pressure stabilizing, L1And L2Respectively Voltage Feedback system
Several and current feedback coefficient, TsFor the sampling period, k is sampling number (k is the integer more than or equal to 1), Udest(0) and Iest(0)
Value be 0.The equation group being made up of discretization formula calculates ripple current instantaneous value.
Step 230, according to ripple current instantaneous value, determine ripple current virtual value.
Optionally, ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value, ripple current is had
Valid value is as ripple current value.The frequency of ripple current envelope is 2 times, time cycle T of supply frequency, and T=N
Ts.As shown in figure 3, actual DC bus-bar voltage, as shown in curve 301, actual ripple current is as shown in curve 302, estimation
DC bus-bar voltage as is shown by curve 303, the ripple current of estimation is as illustrated by graph line 304.By comparison it is found that the line of estimation
Wave electric current is more accurate.
The technical solution of the present embodiment obtains ripple current instantaneous value, and then basis by estimating ripple current
Ripple current instantaneous value acquires ripple current virtual value.
Embodiment three
Fig. 4 is a kind of flow chart for control method for frequency conversion air conditioner that the embodiment of the present invention three provides, the technology of the present embodiment
Scheme further refines based on the above technical solution, and optionally, step 120 includes:
Step 410, according to preset temperature and maximum allowable ripple current corresponding relationship, it is determining with capacitance present environment temperature
Spend corresponding maximum allowable ripple current value.
Wherein it is possible to outdoor unit environment temperature is obtained by the temperature sensor configured in frequency-variable air conditioner outdoor machine, according to
The corresponding relationship of outdoor unit environment temperature and capacitive environment temperature determines capacitive environment temperature, exemplary, can be by outdoor unit ring
Table is made or respectively with outdoor unit environment temperature and capacitive environment temperature in the corresponding relationship of border temperature and capacitive environment temperature in advance
Degree is transverse and longitudinal coordinate, is depicted as curve.Then ripple current temperature conversion factor is determined according to capacitive environment temperature, obtains difference
The maximum allowable ripple current value of temperature range.
Step 420, when ripple current virtual value be more than or equal to maximum allowable ripple current value, reduce the function of convertible frequency air-conditioner
Rate.
Wherein, when ripple current virtual value be more than or equal to maximum allowable ripple current value, can be by limiting or reducing pressure
The frequency of contracting machine reduces the load of convertible frequency air-conditioner with the modes such as outdoor fan revolving speed are improved, to reduce the function of convertible frequency air-conditioner
Rate guarantees the reliability of convertible frequency air-conditioner work.Optionally, when ripple current virtual value be more than or equal to maximum allowable ripple current,
According to the ratio of ripple current value and maximum allowable ripple current, the power of convertible frequency air-conditioner is reduced.It is exemplary, it can be according to ripple
The ratio of current effective value and maximum allowable ripple current, ratio of the frequency relative to current frequency after determining compressor frequency reducing
Example, and determine that the revolving speed after outdoor fan raising revolving speed is equivalent to the ratio of current rotating speed.Adjusting compression can be determined in this way
The amplitude of unit frequency and outdoor fan revolving speed avoids adjusting excessive.
Further, control method for frequency conversion air conditioner further include:
Obtain mains input current；
When mains input current, which is more than or equal to, presets maximum allowable input current, the power of the convertible frequency air-conditioner is reduced.
It wherein, can be defeated by power supply in order to meet the reliability when heating capacity and high temperature of convertible frequency air-conditioner at low temperature
Enter electric current as Consideration and different temperatures is preset according to environment temperature and the refrigeration and heating mode of convertible frequency air-conditioner
The maximum allowable input current in section, when mains input current, which is more than or equal to, presets maximum allowable input current, described in reduction
The power of convertible frequency air-conditioner.
The technical solution of the present embodiment determines maximum allowable ripple current value according to environment temperature, and according to current line
Wave current value adjusts the power of convertible frequency air-conditioner, guarantees the functional reliability of convertible frequency air-conditioner.
Example IV
Fig. 5 is the structural schematic diagram that a kind of capacitor ripple current that the embodiment of the present invention four provides estimates device, the device
It can be configured in frequency converter, capacitor ripple current estimation device 50 includes:
Busbar voltage obtains module 510, for periodically acquiring the busbar voltage of frequency converter DC side；
Ripple current instantaneous value determining module 520, for being used for the electricity of pressure stabilizing according to busbar voltage and frequency converter DC side
The capacitance of appearance determines the ripple current instantaneous value of capacitor；
Ripple current virtual value determining module 530, for determining ripple current virtual value according to ripple current instantaneous value.
Further, ripple current instantaneous value determining module is specifically used for:
Ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the busbar voltage of estimation, UdFor the busbar voltage that voltage check device detects, IestFor ripple electricity
Instantaneous value is flowed, C is the capacitance of the capacitor, L1And L2Respectively voltage feedback factor and current feedback coefficient, TsFor sampling week
Phase, k are sampling number, Udest(0) and Iest(0) value is 0；
Correspondingly, ripple current virtual value determining module is specifically used for:
Ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value.
The technical solution of the present embodiment obtains ripple current instantaneous value, and then basis by estimating ripple current
Ripple current instantaneous value acquires ripple current virtual value.
Embodiment five
Fig. 6 is the structural schematic diagram of a kind of convertible frequency air-conditioner control device that the embodiment of the present invention five provides, which can be with
It is configured in the outdoor unit of convertible frequency air-conditioner, convertible frequency air-conditioner control device 60 includes:
Ripple current virtual value obtains module 610, and the capacitor ripple current for being provided by example IV estimates device
Obtain ripple current virtual value of the frequency converter DC side for the capacitor of pressure stabilizing；
Air-conditioning power control module 620, for controlling frequency conversion according to capacitance present environment temperature and ripple current virtual value
The power of air-conditioning.
Further, air-conditioning power control module includes:
Ripple current permissible value determination unit is used for according to preset temperature and maximum allowable ripple current corresponding relationship,
Determine maximum allowable ripple current value corresponding with current environmental temperature；
First air-conditioning power reduces unit, for being more than or equal to maximum allowable ripple current value when ripple current virtual value,
Reduce the power of convertible frequency air-conditioner.
Further, air-conditioning power control module further include:
Input current acquiring unit, for obtaining mains input current；
Second air-conditioning power reduces unit, for presetting maximum allowable input current when mains input current is more than or equal to
When, reduce the power of convertible frequency air-conditioner.
Further, the first air-conditioning power reduces unit and is specifically used for:
When ripple current virtual value be more than or equal to maximum allowable ripple current, according to ripple current virtual value with it is maximum allowable
The ratio of ripple current reduces the power of convertible frequency air-conditioner.
The technical solution of the present embodiment, by obtaining ripple current value of the frequency converter DC side for the capacitor of pressure stabilizing, control
The power of convertible frequency air-conditioner processed, solve because capacitor ripple current it is excessive, cause the capacitor lost of life, caused by influence convertible frequency air-conditioner
The problem of complete machine works normally realizes the effect for improving convertible frequency air-conditioner reliability of operation.
Embodiment six
The embodiment of the present invention also provides a kind of frequency converter, has cross-straight-intersection topological structure, and DC side is provided with for steady
The capacitor of pressure, the frequency converter further include the capacitor ripple current estimation device that example IV provides.As shown in fig. 7, frequency converter 70
Capacitor 710 and capacitor ripple current including DC side for pressure stabilizing estimate device 50.
Embodiment seven
The embodiment of the present invention also provides a kind of convertible frequency air-conditioner, and the frequency converter 70 and embodiment five provided including embodiment six mentions
For convertible frequency air-conditioner control device 60.As shown in figure 8, convertible frequency air-conditioner 80 includes frequency converter 70, compressor 810,820 and of outdoor fan
Convertible frequency air-conditioner control device 60.
Method provided by any embodiment of the invention can be performed in the said goods, has the corresponding functional module of execution method
And beneficial effect.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (12)
1. a kind of capacitor ripple current evaluation method characterized by comprising
Periodically acquire the busbar voltage of frequency converter DC side；
Capacitance according to the busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing determines the ripple electricity of the capacitor
Flow instantaneous value；
According to the ripple current instantaneous value, ripple current virtual value is determined；
Wherein, the capacitance according to the busbar voltage and frequency converter DC side for the capacitor of pressure stabilizing, determines the capacitor
Ripple current instantaneous value includes:
Ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the busbar voltage of estimation, UdFor the busbar voltage that voltage check device detects, IestFor ripple current wink
Duration, C are the capacitance of the capacitor, L1And L2Respectively voltage feedback factor and current feedback coefficient, TsFor sampling period, k
For sampling number, Udest(0) and Iest(0) value is 0；
Correspondingly, determining that ripple current virtual value includes: according to the ripple current instantaneous value
Ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value.
2. a kind of capacitor ripple current estimates device characterized by comprising
Busbar voltage obtains module, for periodically acquiring the busbar voltage of frequency converter DC side；
Ripple current instantaneous value determining module, for the capacitor according to the busbar voltage and frequency converter DC side for pressure stabilizing
Capacitance determines the ripple current instantaneous value of the capacitor；
Ripple current virtual value determining module, for determining ripple current virtual value according to the ripple current instantaneous value；
Wherein, ripple current instantaneous value determining module is specifically used for:
Ripple current instantaneous value is calculated according to following formula:
Wherein, UdestFor the busbar voltage of estimation, UdFor the busbar voltage that voltage check device detects, IestFor ripple current wink
Duration, C are the capacitance of the capacitor, L1And L2Respectively voltage feedback factor and current feedback coefficient, TsFor sampling period, k
For sampling number, Udest(0) and Iest(0) value is 0；
Correspondingly, ripple current virtual value determining module is specifically used for:
Ripple current virtual value is calculated according to following formula:
Wherein, N is the number sampled in a ripple current period, IRMSFor ripple current virtual value.
3. a kind of control method for frequency conversion air conditioner characterized by comprising
Line of the frequency converter DC side for the capacitor of pressure stabilizing is obtained based on capacitor ripple current evaluation method described in claim 1
Wave current effective value；
According to capacitance present environment temperature and the ripple current virtual value, the power of the convertible frequency air-conditioner is controlled.
4. control method for frequency conversion air conditioner according to claim 3, which is characterized in that according to capacitance present environment temperature and institute
Ripple current virtual value is stated, the power for controlling the convertible frequency air-conditioner includes:
According to preset temperature and maximum allowable ripple current corresponding relationship, maximum corresponding with capacitance present environment temperature is determined
Allow ripple current value；
When the ripple current virtual value be more than or equal to maximum allowable ripple current value, reduce the power of the convertible frequency air-conditioner.
5. control method for frequency conversion air conditioner according to claim 4, which is characterized in that further include:
Obtain mains input current；
When the mains input current, which is more than or equal to, presets maximum allowable input current, the power of the convertible frequency air-conditioner is reduced.
6. control method for frequency conversion air conditioner according to claim 4, which is characterized in that when the ripple current virtual value is greater than
Equal to maximum allowable ripple current value, the power for reducing the convertible frequency air-conditioner includes:
When the ripple current virtual value is more than or equal to maximum allowable ripple current value, according to the ripple current virtual value and most
The big ratio for allowing ripple current value, reduces the power of the convertible frequency air-conditioner.
7. a kind of convertible frequency air-conditioner control device characterized by comprising
Ripple current virtual value obtains module, becomes for estimating that device obtains by capacitor ripple current as claimed in claim 2
Ripple current virtual value of the frequency device DC side for the capacitor of pressure stabilizing；
Air-conditioning power control module, for controlling the change according to capacitance present environment temperature and the ripple current virtual value
The power of frequency air-conditioning.
8. convertible frequency air-conditioner control device according to claim 7, which is characterized in that air-conditioning power control module includes:
Ripple current permissible value determination unit, for determining according to preset temperature and maximum allowable ripple current corresponding relationship
Maximum allowable ripple current value corresponding with current environmental temperature；
First air-conditioning power reduces unit, for being more than or equal to maximum allowable ripple current value when the ripple current virtual value,
Reduce the power of the convertible frequency air-conditioner.
9. convertible frequency air-conditioner control device according to claim 8, which is characterized in that air-conditioning power control module further include:
Input current acquiring unit, for obtaining mains input current；
Second air-conditioning power reduces unit, for presetting maximum allowable input current when the mains input current is more than or equal to
When, reduce the power of the convertible frequency air-conditioner.
10. convertible frequency air-conditioner control device according to claim 8, which is characterized in that the first air-conditioning power reduces unit tool
Body is used for:
When the ripple current virtual value is more than or equal to maximum allowable ripple current value, according to the ripple current virtual value and most
The big ratio for allowing ripple current value, reduces the power of the convertible frequency air-conditioner.
11. a kind of frequency converter, has cross-straight-intersection topological structure, DC side is provided with the capacitor for pressure stabilizing, which is characterized in that
It further include capacitor ripple current estimation device as claimed in claim 2.
12. a kind of convertible frequency air-conditioner, which is characterized in that including described in claim 11 frequency converter and change as claimed in claim 7
Frequency air conditioning control device.
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| CN201611217387.1A CN106645880B (en) | 2016-12-26 | 2016-12-26 | Capacitor ripple current evaluation method and device, control method for frequency conversion air conditioner and device, frequency converter and convertible frequency air-conditioner |
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| CN108879616A (en) * | 2018-07-26 | 2018-11-23 | 奥克斯空调股份有限公司 | A kind of capacitor ripple current protective device, method and air conditioner |
| CN109490794A (en) * | 2018-10-18 | 2019-03-19 | 湖南恩智测控技术有限公司 | A kind of power supply ripple test circuit and test method |
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