CN105406796B - A kind of frequency-changeable compressor control method for frequency, system and convertible frequency air-conditioner - Google Patents
A kind of frequency-changeable compressor control method for frequency, system and convertible frequency air-conditioner Download PDFInfo
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- CN105406796B CN105406796B CN201511028857.5A CN201511028857A CN105406796B CN 105406796 B CN105406796 B CN 105406796B CN 201511028857 A CN201511028857 A CN 201511028857A CN 105406796 B CN105406796 B CN 105406796B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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Abstract
The present invention relates to a kind of frequency-changeable compressor control method for frequency, system and convertible frequency air-conditioner.Methods described includes obtaining the two-phase current Id and Iq of frequency converting air-conditioner compressor in real time；Calculate Id/Iq value；When Id/Iq value is more than or equal to the first preset value, initiation culture limitation, into frequency reducing region, control compressor is run according to default step-length frequency reducing；When Id/Iq value drops between the second preset value and the 3rd preset value, into frequency holding area, control compressor keeps current frequency operation；When Id/Iq value is dropped to less than equal to three preset values, into frequency normal region, control compressor is run with normal target frequency.The present invention has taken into full account electric current influence, can be when current loading is big, it is not easy to enters limit frequency, and in undertension, compressor drive circuit can continue to allow compressor operating to take full advantage of weak magnetic function in higher frequency by way of weak magnetic.
Description
Technical field
The present invention relates to Compressor Technology field, more particularly to a kind of frequency-changeable compressor control method for frequency, system and change
Frequency air-conditioning.
Background technology
Present convertible frequency air-conditioner in order to protect compressor under various operating modes or environment can reliable and secure work, set
A variety of safeguard measures.Voltage limit frequency is one of which protected mode.When the supply voltage of air-conditioning reduces, the direct current after inversion
Voltage also can be reduced accordingly, the electricity for driving compressor circuit needs below due to worrying the DC voltage after reducing to meet
Pressure, now the maximum of compressor can running frequency will accordingly reduce.Voltage limit frequency is when current voltage is less than limit frequency threshold value electricity
During pressure, start limit frequency, decline compressor frequency.It is this to be had the following disadvantages by way of voltage carries out limiting frequency：
1) influence of electric current is not accounted for, under same alternating voltage input condition, the direct current when load current is big
The Amplitude Ration load current hour of drops is big.Therefore voltage limit frequency is easily entered when load current is big.
2) when undertension, compressor drive circuit can by way of weak magnetic, continue to allow compressor operating compared with
High frequency, and frequency is limited by voltage and forces compressor frequency reducing then to make full use of weak magnetic function.
The content of the invention
The technical problems to be solved by the invention are in view of the shortcomings of the prior art, there is provided a kind of frequency-changeable compressor frequency control
Method, system and convertible frequency air-conditioner processed.
For achieving the above object, the invention provides a kind of frequency-changeable compressor control method for frequency, including following step
Suddenly:
S1, the two-phase current Id and Iq of frequency converting air-conditioner compressor are obtained in real time；
S2, Id/Iq value is calculated according to two-phase current Id and Iq；
S3, when Id/Iq value is more than or equal to the first preset value Id_IqProtPercent, initiation culture limitation, enter
Frequency reducing region, control compressor are run according to default step-length frequency reducing；
S4, when Id/Iq value drops to the second preset value Id_IqHoldPercent and the 3rd preset value Id_
When between IqRevPercent, into frequency holding area, control compressor keeps current frequency operation；
S5, after frequency holding area keeps T time, judge whether Id/Iq value drops to less than and preset equal to the 3rd
Value Id_IqRevPercent, if yes then enter frequency normal region, control compressor is run with normal target frequency；It is no
Then it is continually maintained in frequency holding area；
Wherein, the 3rd preset value<Second preset value<First preset value.
The beneficial effects of the invention are as follows：On the basis of the present invention takes into full account that electric current influences, pass through frequency converting air-conditioner compressor
Two-phase current Id and Iq ratio in judgement whether carry out limit frequency, after limit frequency is carried out, there is provided compressor frequency holding area
With frequency normal region, by Id and Iq ratio, frequency can be allowed to be in hold mode or recover to normal operating frequency, this
Invention can be when current loading be big, it is not easy to enters limit frequency, and in undertension, compressor drive circuit can be by weak
The mode of magnetic, continue to allow compressor operating to take full advantage of weak magnetic function in higher frequency.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, in S3 when Id/Iq value is more than the first preset value Id_IqProtPercent, and initiation culture limits,
Limit frequency is set to be masked as 1；When Id/Iq value is less than the first preset value Id_IqProtPercent, current limit frequency marking will is judged
Whether it is 1, if not being 1, representative is in frequency normal region, and control compressor is run with normal target frequency, if
For 1, then represent and be in frequency reducing region or frequency holding area, judged according to Id/Iq value in frequency reducing region or frequency guarantor
Region is held, if being in frequency reducing region, control compressor is run according to default step-length frequency reducing, if being in frequency holding area,
Compressor is controlled to keep current frequency operation；
In S5 when Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency marking is removed
Will, into frequency normal region.
Further, when Id/Iq value is more than the first preset value Id_IqProtPercent, set limit frequency to be masked as 1, open
Dynamic frequency limits；Limit frequency marking will is set, can be in follow-up judgement, when Id/Iq value is more than the first preset value Id_
During IqProtPercent, quickly judge to be in frequency normal region or frequency reducing region or frequency holding area, so as to right
Compressor is controlled accordingly；Because before Id/Iq value rises to the first preset value Id_IqProtPercent, it is in
Frequency normal region, after the first preset value Id_IqProtPercent is raised to, into limit frequency domain, start limit frequency, Id/Iq
Value can decline, drop to less than after Id_IqProtPercent still in limit frequency domain or frequency holding area, at this moment
Value with Id/Iq before rising to Id_IqProtPercent may be equal, but in different states, it is necessary to compressor
Carry out different controls.
Further, in frequency holding area, if target frequency is less than running frequency, control under compressor operating frequency
Target frequency is dropped to, otherwise maintains current operation frequency.
Further, S1 is implemented as：
S1.1, when frequency converting air-conditioner compressor is run, detect and be calculated compressor three-phase electricity flow valuve Iu, Iv and
Iw；
S1.2, through Coordinate Conversion, three-phase electricity flow valuve Iu, Iv and Iw are converted into two phase electricity flow valuve Id and Iq.
Further, in S1.1 by way of single resistance or three resistance Sampling Compression machine three-phase electricity flow valuve Iu, Iv and Iw；
Through Coordinate Conversion in S1.2, the calculation formula that three-phase electricity flow valuve Iu, Iv and Iw are converted to two phase electricity flow valuve Id and Iq is as follows：
Wherein, θ represents the rotor mechanical angle of compressor.
For achieving the above object, present invention also offers a kind of frequency-changeable compressor frequency control system, including：Electric current
Acquisition module, for obtaining the two-phase current Id and Iq of frequency converting air-conditioner compressor in real time；Computing module, for according to two-phase current
Id and Iq calculates Id/Iq value；Control module, for when Id/Iq value is more than the first preset value Id_IqProtPercent,
Initiation culture is limited, and control compressor is run according to default step-length frequency reducing；When Id/Iq value drops to the second preset value Id_
When between IqHoldPercent and the 3rd preset value Id_IqRevPercent, control compressor keeps current frequency operation；
After frequency holding area keeps T time, judge whether Id/Iq value is dropped to less than equal to the 3rd preset value Id_
IqRevPercent, if yes then enter frequency normal region, control compressor is run with normal target frequency；Otherwise continue
It is maintained at frequency holding area；
Wherein, the 3rd preset value<Second preset value<First preset value
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, when Id/Iq value is more than the first preset value Id_IqProtPercent, and initiation culture limits, set
Limit frequency is masked as 1；When Id/Iq value is less than the first preset value Id_IqProtPercent, whether current limit frequency marking will is judged
For 1, if not being 1, representative be in frequency normal region, controls compressor to be run with normal target frequency, if 1,
Then represent and be in frequency reducing region or frequency holding area, judged to be in frequency reducing region or frequency holding area according to Id/Iq value
Domain, if being in frequency reducing region, control compressor is run according to default step-length frequency reducing, if being in frequency holding area, control
Compressor keeps current frequency operation；
When Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency marking will is removed, is entered
Enter frequency normal region.
Further, the electric current acquisition module includes current detecting unit and current calculation unit；The electric current obtains single
Member, for when frequency converting air-conditioner compressor is run, detecting and three-phase current Iu, Iv and Iw of compressor being calculated；The electricity
Stream calculation unit, for through Coordinate Conversion, three-phase electricity flow valuve Iu, Iv and Iw to be converted into two phase electricity flow valuve Id and Iq.
Further, the three-phase electricity flow valuve of electric current acquiring unit Sampling Compression machine by way of single resistance or three resistance
Iu, Iv and Iw；Three-phase electricity flow valuve Iu, Iv and Iw are converted to two phase electricity flow valuve Id by the current calculation unit through Coordinate Conversion
It is as follows with Iq calculation formula：
Wherein, θ represents the rotor mechanical angle of compressor.
For achieving the above object, present invention also offers a kind of convertible frequency air-conditioner, including described in above-mentioned technical proposal
Frequency-changeable compressor frequency control system.
Brief description of the drawings
Fig. 1 is frequency-changeable compressor control method for frequency flow chart of the present invention；
Fig. 2 is the frequency operation area schematic diagram of the present invention set according to Id/Iq value；
Fig. 3 is frequency-changeable compressor frequency control system block diagram of the present invention；
Fig. 4 is convertible frequency air-conditioner schematic diagram of the present invention.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in figure 1, a kind of frequency-changeable compressor control method for frequency, comprises the following steps:
S1, the two-phase current Id and Iq of frequency converting air-conditioner compressor are obtained in real time.
Specifically, S1.1, when frequency converting air-conditioner compressor is run, detect and the three-phase electricity flow valuve of compressor is calculated
Iu, Iv and Iw；S1.2, through Coordinate Conversion, three-phase electricity flow valuve Iu, Iv and Iw are converted into two phase electricity flow valuve Id and Iq.In S1.1
Three-phase electricity flow valuve Iu, Iv and Iw of Sampling Compression machine by way of single resistance or three resistance；Through Coordinate Conversion in S1.2, by three
The calculation formula that phase current values Iu, Iv and Iw are converted to two phase electricity flow valuve Id and Iq is as follows：
Wherein, θ represents the rotor mechanical angle of compressor.
Vq=R iq+ ω Ld id+Eq；
Vd=R id- ω Lq iq+Ed；
Wherein, Vd, Vq represent the d shaft voltages and q shaft voltages of dq reference axis respectively, and R represents electric motor resistance, and ω represents motor
Electronics rotating speed, Ld represent d axle inductances, and Eq represents q axle counter electromotive force.
V α, Vq represent to represent the α shaft voltages and β shaft voltages of α β reference axis respectively；θ represents rotor machinery Angle Position.
Can be in the hope of the ON time of T1, T2 period during bi-phase modulated according to formula conversion：When T1, T2 maximum conducting
Between it is long, the frequency of operation is just high.
Wherein, T is the PWM cycle time, and Vdc is DC bus-bar voltage.
From above formula as can be seen that the ON time of T1, T2 period are relevant with Vdc.When Vdc changes are small, T1, T2's
ON time will become could maintain corresponding motor speed greatly.Therefore when Vdc becomes less and less, T1, T2 time meeting
Progressively reach limiting value, it is impossible to increase again.When Vdc changes are small, it can now pass through weak magnetic mode, forcibly changing Id, increase Id
Negative current, correspondingly Iq can reduce to change T1, T2 ON time.Therefore it is estimated that Vdc can not be carried by Id/Iq
Carry out motor for enough voltage.
Under normal circumstances, if Vdc is sufficiently large, now Id value very little, Iq value can adjust according to the size of frequency, when frequency
When rate is high, Iq will increase.When Vdc deficiencies, now using under weak magnetic mode, Id increases, Iq reduces, and Id/Iq ratio is just
Can be bigger than normal condition.What if Vdc reduced again, Id may proceed to increase, and Iq continues to reduce, and Id/Iq ratio will be bigger,
So Id/Iq ratio can reflect whether Vdc is sufficient.
As shown in Fig. 2 according to Id/Iq value, different frequency operation areas is set, is divided into frequency reducing region, frequency is kept
Region and frequency normal region.
S2, Id/Iq value is calculated according to two-phase current Id and Iq.
S3, when Id/Iq value is more than or equal to the first preset value Id_IqProtPercent, initiation culture limitation, enter
Frequency reducing region, control compressor are run according to default step-length frequency reducing.Default step-length can be with the 0.1 second speed for declining 1Hz
Frequency reducing.
Specifically, when Id/Iq value is more than the first preset value Id_IqProtPercent, and initiation culture limits, set
Limit frequency is masked as 1；When Id/Iq value is less than the first preset value Id_IqProtPercent, whether current limit frequency marking will is judged
For 1, if not being 1, representative be in frequency normal region, controls compressor to be run with normal target frequency, if 1,
Then represent and be in frequency reducing region or frequency holding area, judged to be in frequency reducing region or frequency holding area according to Id/Iq value
Domain, if being in frequency reducing region, control compressor is run according to default step-length frequency reducing, if being in frequency holding area, control
Compressor keeps current frequency operation；
S4, when Id/Iq value drops to the second preset value Id_IqHoldPercent and the 3rd preset value Id_
When between IqRevPercent, into frequency holding area, control compressor keeps current frequency operation.
S5, after frequency holding area keeps T time, judge whether Id/Iq value drops to less than and preset equal to the 3rd
Value Id_IqRevPercent, if yes then enter frequency normal region, control compressor is run with normal target frequency；It is no
Then it is continually maintained in frequency holding area.Control T in frequency holding area T time, the present embodiment can be 3 minutes, then sentence
Whether disconnected Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, if it is, into the normal area of frequency
Domain, if it is not, continuing to keep current frequency operation in frequency holding area, control frequency.Section is kept to stop one in frequency
The section time, effectively prevent from entering after frequency holding area and immediately entering to normal region, frequency at once rising again, do not reach limit frequency
Purpose.Such as compressor current operation frequency is 40Hz, and it is 50Hz to control the target frequency of compressor, due to originals such as limit frequencies
Cause, if being in frequency holding area, the frequency of compressor can not rise to this target frequency of 50Hz, can be only sustained at and work as
Preceding 40Hz operations.If into frequency normal region, frequency rises to 50Hz this target frequency operations.
Specifically, when Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency is removed
Mark, into frequency normal region.
Wherein, the 3rd preset value<Second preset value<First preset value.
When Id/Iq value is more than the first preset value Id_IqProtPercent, limit frequency is set to be masked as 1, initiation culture
Limitation；Limit frequency marking will is set, can be in follow-up judgement, when Id/Iq value is more than the first preset value Id_
During IqProtPercent, quickly judge to be in frequency normal region or frequency reducing region or frequency holding area, so as to right
Compressor is controlled accordingly；Because before Id/Iq value rises to the first preset value Id_IqProtPercent, it is in
Frequency normal region, after the first preset value Id_IqProtPercent is raised to, into limit frequency domain, start limit frequency, Id/Iq
Value can decline, drop to less than after Id_IqProtPercent still in limit frequency domain or frequency holding area, at this moment
Value with Id/Iq before rising to Id_IqProtPercent may be equal, but in different states, it is necessary to compressor
Carry out different controls.
In frequency holding area, if target frequency is less than running frequency, control compressor operating frequency drops to mesh
Frequency is marked, otherwise maintains current operation frequency.
In the control program of outdoor master control borad, following program is performed：
In the PWM interrupt routines of compressor, Id/Iq value, compressor start are calculated according to the Id of acquisition and Iq value
And the scheduled time (after opening 20 seconds) is run, if Id/Iq>Id_IqProtPercent, equipment limit frequency are masked as 1, set
In frequency reducing region, otherwise judge whether current limit frequency marking will is 1, if judging whether Id_IqHoldPercent<Id/Iq
<Id_IqProtPercent, frequency reducing region is if it is maintained at, carries out frequency reducing control, if limit frequency marking will is not 1, set
Put and be in frequency normal region, run with normal target frequency.In Id/Iq<In the case of Id_IqProtPercent, carry out
Current limit frequency identifies whether the judgement for 1, and reason is before Id/Iq does not rise to Id_IqProtPercent, is to belong to frequency
Rate normal region, it should be controlled with normal target frequency, and after limit frequency marking will is arranged to 1, i.e., Id/Iq has risen
To Id_IqProtPercent, and begin to decline, after Id_IqProtPercent is dropped to less than, be then no longer belong to frequency just
Normal region, belong to frequency reducing region or frequency holding area, frequency normal region is entered back into after exiting frequency holding area.Limiting
In the case that frequency is masked as 1, if Id_IqHoldPercent<Id/Iq<Id_IqProtPercent, frequency reducing region is still fallen within,
Frequency reducing control is carried out, if Id_IqRevPercent<Id/Iq<Id_IqHoldPercent, then into holding area.In frequency
After holding area is kept for 3 minutes, judge whether Id/Iq<Id_IqRevPercent, limit frequency marking will is if it is removed, exits frequency
Rate holding area, into frequency normal region, recover to run with normal target frequency；Otherwise it is continually maintained in frequency holding area
Domain.
In main program, judge after entering each region, perform corresponding FREQUENCY CONTROL action.Such as in frequency reducing region, then with
The speed frequency reducing for declining 1Hz in 0.1 second, if Id/Iq continues frequency reducing, directly still above Id_IqProtPercent after frequency reducing
Drop to compressor minimum frequency Id_IqMinFreq to frequency.In holding area, frequency keeps constant, only works as target frequency
Decline, during less than current frequency, just decline running frequency.And in frequency normal region, the control of frequency is according to normal mode control
System.
As shown in figure 3, a kind of frequency-changeable compressor frequency control system, including：Electric current acquisition module, become for obtaining in real time
The two-phase current Id and Iq of frequency compressor of air conditioner；Computing module, for calculating Id/Iq value according to two-phase current Id and Iq；Control
Molding block, for when Id/Iq value is more than the first preset value Id_IqProtPercent, initiation culture limitation, control to be compressed
Machine is run according to default step-length frequency reducing；Preset when Id/Iq value drops to the second preset value Id_IqHoldPercent and the 3rd
When between value Id_IqRevPercent, control compressor keeps current frequency operation；It is equal to when Id/Iq value drops to less than
During the 3rd preset value Id_IqRevPercent, control compressor is run with normal target frequency；Wherein, the 3rd preset value<The
Two preset values<First preset value
When Id/Iq value is more than the first preset value Id_IqProtPercent, and initiation culture limits, limit frequency marking will is set
For 1；When Id/Iq value is less than the first preset value Id_IqProtPercent, judge whether current limit frequency marking will is 1, if
It is not 1, then represents and be in frequency normal region, control compressor to be run with normal target frequency, if 1, then representative office
In frequency reducing region or frequency holding area, judged to be in frequency reducing region or frequency holding area according to Id/Iq value, if place
In frequency reducing region, control compressor is run according to default step-length frequency reducing, if being in frequency holding area, control compressor is kept
Current frequency is run；When Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency marking is removed
Will, into frequency normal region.
The electric current acquisition module includes current detecting unit and current calculation unit；The electric current acquiring unit, is used for
When frequency converting air-conditioner compressor is run, detect and three-phase electricity flow valuve Iu, Iv and Iw of compressor is calculated；The Current calculation
Unit, for through Coordinate Conversion, three-phase electricity flow valuve Iu, Iv and Iw to be converted into two phase electricity flow valuve Id and Iq.The electric current obtains
Three-phase electricity flow valuve Iu, Iv and Iw of unit Sampling Compression machine by way of single resistance or three resistance；The current calculation unit
Through Coordinate Conversion, the calculation formula that three-phase electricity flow valuve Iu, Iv and Iw are converted to two phase electricity flow valuve Id and Iq is as follows：
Wherein, θ represents the rotor mechanical angle of compressor.
As shown in figure 4, present invention also offers a kind of convertible frequency air-conditioner, including the frequency-changeable compressor described in above-mentioned technical proposal
Frequency control system.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
- A kind of 1. frequency-changeable compressor control method for frequency, it is characterised in that, comprise the following steps:S1, the two-phase current Id and Iq of frequency converting air-conditioner compressor are obtained in real time；S2, Id/Iq value is calculated according to two-phase current Id and Iq；S3, when Id/Iq value is more than or equal to the first preset value Id_IqProtPercent, initiation culture limitation, into frequency reducing Region, control compressor are run according to default step-length frequency reducing；S4, when Id/Iq value drops to the second preset value Id_IqHoldPercent and the 3rd preset value Id_IqRevPercent Between when, into frequency holding area, control compressor keeps current frequency operation；S5, after frequency holding area keeps T time, judge whether Id/Iq value is dropped to less than equal to the 3rd preset value Id_ IqRevPercent, if yes then enter frequency normal region, control compressor is run with normal target frequency；Otherwise continue It is maintained at frequency holding area；Wherein, the 3rd preset value<Second preset value<First preset value.
- 2. a kind of frequency-changeable compressor control method for frequency according to claim 1, it is characterised in that when Id/Iq value in S3 During more than the first preset value Id_IqProtPercent, limit frequency is set to be masked as 1, initiation culture limitation；It is less than in Id/Iq value During the first preset value Id_IqProtPercent, judge whether current limit frequency marking will is 1, if not being 1, representative is in frequency Normal region, control compressor are run with normal target frequency, if 1, are then represented and are kept in frequency reducing region or frequency Region, judged to be in frequency reducing region or frequency holding area according to Id/Iq value, if being in frequency reducing region, control compression Machine is run according to default step-length frequency reducing, if being in frequency holding area, control compressor keeps current frequency operation；In S5 when Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency marking will is removed, is entered Enter frequency normal region.
- A kind of 3. frequency-changeable compressor control method for frequency according to claim 1, it is characterised in that in frequency holding area, If target frequency is less than running frequency, control compressor operating frequency drops to target frequency, otherwise maintains current fortune Line frequency.
- 4. a kind of frequency-changeable compressor control method for frequency according to claim 1, it is characterised in that S1's is implemented as：S1.1, when frequency converting air-conditioner compressor is run, detect and three-phase electricity flow valuve Iu, Iv and Iw of compressor is calculated；S1.2, through Coordinate Conversion, three-phase electricity flow valuve Iu, Iv and Iw are converted into two phase electricity flow valuve Id and Iq.
- A kind of 5. frequency-changeable compressor control method for frequency according to claim 4, it is characterised in that, pass through single resistance in S1.1 Or three resistance mode Sampling Compression machine three-phase electricity flow valuve Iu, Iv and Iw；Through Coordinate Conversion in S1.2, by three-phase electricity flow valuve The calculation formula that Iu, Iv and Iw are converted to two phase electricity flow valuve Id and Iq is as follows：<mrow> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>i</mi> <mi>d</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>q</mi> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&theta;</mi> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>4</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>sin</mi> <mi>&theta;</mi> </mrow> </mtd> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>4</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>i</mi> <mi>u</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>v</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>w</mi> </msub> </mtd> </mtr> </mtable> </mfenced> </mrow>Wherein, θ represents the rotor mechanical angle of compressor.
- A kind of 6. frequency-changeable compressor frequency control system, it is characterised in that, including：Electric current acquisition module, for obtaining the two-phase current Id and Iq of frequency converting air-conditioner compressor in real time；Computing module, for calculating Id/Iq value according to two-phase current Id and Iq；Control module, for when Id/Iq value is more than the first preset value Id_IqProtPercent, initiation culture limitation, controlling Compressor processed is run according to default step-length frequency reducing；When Id/Iq value drops to the second preset value Id_IqHoldPercent and When between three preset value Id_IqRevPercent, control compressor keeps current frequency operation；T is kept in frequency holding area After time, judge whether Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, if yes then enter Frequency normal region, control compressor are run with normal target frequency；Otherwise it is continually maintained in frequency holding area；Wherein, the 3rd preset value<Second preset value<First preset value.
- 7. a kind of frequency-changeable compressor frequency control system according to claim 6, it is characterised in that when Id/Iq value is more than First preset value Id_IqProtPercent, when initiation culture limits, limit frequency is set to be masked as 1；It is less than first in Id/Iq value During preset value Id_IqProtPercent, judge whether current limit frequency marking will is 1, if not being 1, represent normal in frequency Region, control compressor run with normal target frequency, and if 1, then representative is in frequency reducing region or frequency holding area, According to Id/Iq value judge be in frequency reducing region or frequency holding area, if being in frequency reducing region, control compressor according to Default step-length frequency reducing operation, if being in frequency holding area, control compressor keeps current frequency operation；When Id/Iq value is dropped to less than equal to the 3rd preset value Id_IqRevPercent, limit frequency marking will is removed, into frequency Rate normal region.
- A kind of 8. frequency-changeable compressor frequency control system according to claim 6, it is characterised in that, the electric current acquisition module Including current detecting unit and current calculation unit；The electric current acquiring unit, for when frequency converting air-conditioner compressor is run, detecting and the three-phase electricity of compressor being calculated Flow valuve Iu, Iv and Iw；The current calculation unit, for through Coordinate Conversion, by three-phase electricity flow valuve Iu, Iv and Iw be converted to two phase electricity flow valuve Id and Iq。
- A kind of 9. frequency-changeable compressor frequency control system according to claim 8, it is characterised in that the electric current acquiring unit Three-phase electricity flow valuve Iu, Iv and Iw of Sampling Compression machine by way of single resistance or three resistance；The current calculation unit is through sitting Mark conversion, the calculation formula that three-phase electricity flow valuve Iu, Iv and Iw are converted to two phase electricity flow valuve Id and Iq are as follows：<mrow> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>i</mi> <mi>d</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>q</mi> </msub> </mtd> </mtr> </mtable> </mfenced> <mo>=</mo> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>&theta;</mi> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>4</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>sin</mi> <mi>&theta;</mi> </mrow> </mtd> <mtd> <mrow> <mi>sin</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>4</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>&theta;</mi> <mo>-</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mn>3</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mfenced open = "(" close = ")"> <mtable> <mtr> <mtd> <msub> <mi>i</mi> <mi>u</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>v</mi> </msub> </mtd> </mtr> <mtr> <mtd> <msub> <mi>i</mi> <mi>w</mi> </msub> </mtd> </mtr> </mtable> </mfenced> </mrow>Wherein, θ represents the rotor mechanical angle of compressor.
- 10. a kind of convertible frequency air-conditioner, it is characterised in that including the frequency-changeable compressor FREQUENCY CONTROL described in claim any one of 6-9 System.
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| JP2009213336A (en) * | 2008-03-06 | 2009-09-17 | Nissan Motor Co Ltd | Motor controller |
| CN104214886A (en) * | 2013-05-30 | 2014-12-17 | 广东美的制冷设备有限公司 | Control method for variable frequency air conditioner |
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| CN105066540A (en) * | 2015-07-20 | 2015-11-18 | 广东美的暖通设备有限公司 | Start control method and system for variable-frequency air conditioner and air conditioner |
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| JP2009213336A (en) * | 2008-03-06 | 2009-09-17 | Nissan Motor Co Ltd | Motor controller |
| CN104214886A (en) * | 2013-05-30 | 2014-12-17 | 广东美的制冷设备有限公司 | Control method for variable frequency air conditioner |
| CN104601053A (en) * | 2013-10-31 | 2015-05-06 | 株式会社安川电机 | MOTOR CONTROL APPARATUS AND MOTOR control METHOD |
| CN104333273A (en) * | 2014-09-28 | 2015-02-04 | 四川长虹电器股份有限公司 | Flux-weakening control method for variable frequency controller of permanent magnet synchronous motor |
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