CN109713978A - A kind of processing method and processing device that frequency-changeable compressor power down is shut down - Google Patents
A kind of processing method and processing device that frequency-changeable compressor power down is shut down Download PDFInfo
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Abstract
The present invention provides the processing method and processing devices that a kind of frequency-changeable compressor power down is shut down, comprising: when alternating current stops input voltage, determines whether occur concussion waveform in the waveform of the input current of frequency-changeable compressor；When determining appearance concussion waveform in the waveform of input current of frequency-changeable compressor, determine whether the voltage value of DC bus is greater than preset regulated value, if it is, increase the value range of the index of modulation, otherwise, adjustment weak magnetic controls modified tone rate, increases overload frequency reducing rate.This programme can be avoided frequency-changeable compressor and vibrate when power down is shut down.
Description
Technical field
The present invention relates to variable-frequency driving technique field, in particular to processing method that a kind of frequency-changeable compressor power down is shut down and
Device.
Background technique
Currently, the frequency-changeable compressor of intelligent appliance in orderly closedown, can be said the word by master control and frequency conversion drive is required to stop
Output, variable frequency output voltage is greater than the counter electromotive force of compressor at this time, and the counter electromotive force of frequency-changeable compressor cannot give DC bus
Charging, frequency-changeable compressor phase current is not in oscillatory occurences.
But when the shutdown of the unexpected power down of alternating current, before the related protection of no appearance, frequency conversion drive still presses master control instruction
Operation, with the reduction of DC bus-bar voltage, the output voltage of frequency conversion drive can be reduced and then, anti-electronic when frequency-changeable compressor
When gesture is greater than output voltage, counter electromotive force can charge to DC bus, and frequency conversion drive is also working at this time, so as to cause change
There is oscillation phenomenon in frequency compressor.
Summary of the invention
The embodiment of the invention provides the processing method and processing devices that a kind of frequency-changeable compressor power down is shut down, and can be avoided frequency conversion
Compressor is vibrated when power down is shut down.
In a first aspect, the embodiment of the invention provides the processing methods that a kind of frequency-changeable compressor power down is shut down, comprising:
S0: when alternating current stops input voltage, determine in the waveform of the input current of frequency-changeable compressor whether shake
Waveform；
S1: when determining appearance concussion waveform in the waveform of input current of frequency-changeable compressor, the electricity of DC bus is determined
Whether pressure value is greater than preset regulated value, if so, executing S2, otherwise, executes S3；
S2: increase the value range of the index of modulation；
S3: adjustment weak magnetic controls modified tone rate, executes S4；
S4: increase overload frequency reducing rate.
Preferably,
The S2, comprising:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing D5, otherwise, executes
D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes
S3；
D5: terminate current process.
Preferably,
After the S3, before the S4, further comprise:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing Q4, otherwise, executes
Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, returning
Otherwise Q1 executes S4；
Q4: terminate current process.
Preferably,
The adjustment weak magnetic controls modified tone rate, comprising:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes
X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if
It is to return to X1, otherwise, executes Q1；
X4: terminate current process.
Preferably,
The S4, comprising:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns
C1；
C4: terminate current process；.
Preferably,
When determining the voltage value of the DC bus no more than preset low voltage value,
Before the execution S3, further comprise:
Determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；
When the voltage value of the DC bus is greater than preset under-voltage protection value, S3 is executed.
Second aspect, the embodiment of the invention provides the processing units that a kind of frequency-changeable compressor power down is shut down, comprising:
Waveform detection module, for executing S0: when alternating current stops input voltage, determining the input current of frequency-changeable compressor
Waveform in whether there is concussion waveform；
Voltage detection module, for executing S1: when the waveform detection module determines the input current of frequency-changeable compressor
When occurring concussion waveform in waveform, determine whether the voltage value of DC bus is greater than preset regulated value, if so, triggering toning
Otherwise control module processed triggers weak magnetic control module；
The ovennodulation control module when for being triggered, executing S2: increasing the value range of the index of modulation；
The weak magnetic control module when for being triggered, executes S3: adjustment weak magnetic control modified tone rate and S4: increasing
Load frequency reducing rate.
Preferably,
The ovennodulation control module, for executing:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: it triggers the waveform detection module and determines whether the waveform of the input current of the frequency-changeable compressor is stable, such as
Fruit is to execute D5, otherwise, executes D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes
S3；
D5: terminate current process.
Preferably,
The weak magnetic control module, is further used for executing:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: it triggers the waveform detection module and determines whether the waveform of the input current of the frequency-changeable compressor is stable, such as
Fruit is to execute Q4, otherwise, executes Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, returning
Otherwise Q1 executes S4；
Q4: terminate current process.
Preferably,
The weak magnetic control module, for executing:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes
X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if
It is to return to X1, otherwise, executes Q1；
X4: terminate current process.
Preferably,
The weak magnetic control module, for executing:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns
C1；
C4: terminate current process.
Preferably,
The voltage detection module is further used for being not more than preset low pressure when the voltage value for determining the DC bus
When value, determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；When the voltage value of the DC bus
When greater than preset under-voltage protection value, weak magnetic control module is triggered.
In embodiments of the present invention, when alternating current, which powers off, stops input voltage, the input of frequency-changeable compressor can be first determined
Whether the waveform of electric current shakes, when the waveform for determining input current shakes, it can be determined that d-c bus voltage value
Corresponding changes phase determines that the voltage value of DC bus is greater than preset regulated value and is also less than the regulated value；When
Determine DC bus voltage value be greater than the regulated value when, can by increase the index of modulation value range so that into
Operational mode is modulated, improves drive output voltage to frequency-changeable compressor as far as possible, the minimum voltage for maintaining frequency-changeable compressor to need is kept away
Exempt from the phenomenon that counter electromotive force charges to DC bus, and then frequency-changeable compressor is avoided oscillation phenomenon occur；And when direct current is female
When the voltage value of line is not more than the regulated value, modified tone rate can be controlled by adjusting weak magnetic and increases overload frequency reducing rate, is come
The phenomenon that realizing the counter electromotive force for reducing frequency-changeable compressor, counter electromotive force is avoided to charge to DC bus is kept away to realize
Exempt from frequency-changeable compressor and oscillation phenomenon occurs.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the flow chart for the processing method that a kind of frequency-changeable compressor power down that one embodiment of the invention provides is shut down；
Fig. 2 is the flow chart for the processing method that another frequency-changeable compressor power down that one embodiment of the invention provides is shut down；
Fig. 3 is the structural representation for the processing unit that a kind of frequency-changeable compressor power down that one embodiment of the invention provides is shut down
Figure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the invention provides the processing methods that a kind of frequency-changeable compressor power down is shut down, comprising:
S0: when alternating current stops input voltage, determine in the waveform of the input current of frequency-changeable compressor whether shake
Waveform；
S1: when determining appearance concussion waveform in the waveform of input current of frequency-changeable compressor, the electricity of DC bus is determined
Whether pressure value is greater than preset regulated value, if so, executing S2, otherwise, executes S3；
S2: increase the value range of the index of modulation；
S3: adjustment weak magnetic controls modified tone rate, executes S4；
S4: increase overload frequency reducing rate.
In embodiments of the present invention, when alternating current, which powers off, stops input voltage, the input of frequency-changeable compressor can be first determined
Whether the waveform of electric current shakes, when the waveform for determining input current shakes, it can be determined that d-c bus voltage value
Corresponding changes phase determines that the voltage value of DC bus is greater than preset regulated value and is also less than the regulated value；When
Determine DC bus voltage value be greater than the regulated value when, can by increase the index of modulation value range so that into
Operational mode is modulated, improves drive output voltage to frequency-changeable compressor as far as possible, the minimum voltage for maintaining frequency-changeable compressor to need is kept away
Exempt from the phenomenon that counter electromotive force charges to DC bus, and then frequency-changeable compressor is avoided oscillation phenomenon occur；And when direct current is female
When the voltage value of line is not more than the regulated value, modified tone rate can be controlled by adjusting weak magnetic and increases overload frequency reducing rate, is come
The phenomenon that realizing the counter electromotive force for reducing frequency-changeable compressor, counter electromotive force is avoided to charge to DC bus is kept away to realize
Exempt from frequency-changeable compressor and oscillation phenomenon occurs.
In an embodiment of the present invention, the S2, comprising:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing D5, otherwise, executes
D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes
S3；
D5: terminate current process.
In embodiments of the present invention, by reducing the lower limit value of tone pitch coefficient value range (for example, reducing modified tone threshold
Value), and increase the upper limit value (for example, increasing modified tone rate limits value) of index of modulation value range, ovennodulation can be entered as early as possible
Mode, improves the utilization rate of DC bus-bar voltage, utmostly improves and gives frequency-changeable compressor output voltage, maintains frequency-changeable compressor
The minimum voltage needed, the phenomenon that avoiding counter electromotive force from charging to DC bus.Avoid the upper of index of modulation value range
Limit value is greater than preset ovennodulation limits value, and output voltage can be made more stable.And when the upper limit value of tone pitch coefficient is not less than
When ovennodulation limits value, can control modified tone rate by adjusting weak magnetic reduces the counter electromotive force of frequency-changeable compressor, to avoid anti-electricity
Kinetic potential charges to DC bus, so that frequency-changeable compressor be avoided oscillation phenomenon occur.
In an embodiment of the present invention, after the S3, before the S4, further comprise:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing Q4, otherwise, executes
Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, returning
Otherwise Q1 executes S4；
Q4: terminate current process.
In embodiments of the present invention, by increasing the weak magnetoelectricity stream of frequency-changeable compressor (for example, increasing the limitation of D shaft current
Value), increase the revolving speed of frequency-changeable compressor, and then increase the power of frequency-changeable compressor, to improve to the output electricity of frequency-changeable compressor
Pressure avoids the counter electromotive force of frequency-changeable compressor from charging to DC bus.When the weak magnetoelectricity stream of frequency-changeable compressor is adjusted to the limit,
The counter electromotive force of frequency-changeable compressor can be further decreased by increasing overload frequency reducing rate, gone out to avoid frequency-changeable compressor
The phenomenon that now vibration is even demagnetized.
In an embodiment of the present invention, the adjustment weak magnetic controls modified tone rate, comprising:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes
X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if
It is to return to X1, otherwise, executes Q1；
X4: terminate current process.
In embodiments of the present invention, it by reducing the weak magnetic control starting modified tone rate of frequency-changeable compressor, can be improved to change
The output voltage of frequency compressor charges to avoid the counter electromotive force of frequency-changeable compressor to DC bus, so that frequency conversion be avoided to compress
There is the phenomenon that vibration is even demagnetized in machine.
In an embodiment of the present invention, the S4, comprising:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns
C1；
C4: terminate current process.
In embodiments of the present invention, by reducing the revolving speed of frequency-changeable compressor, and accelerate the speed of frequency-changeable compressor deceleration
The counter electromotive force for reducing frequency-changeable compressor equally may be implemented in rate, avoids there is a phenomenon where counter electromotive force from charging to DC bus,
To eliminate the current oscillation of frequency-changeable compressor power down stopping process.
In an embodiment of the present invention, when determining the voltage value of the DC bus no more than preset low voltage value,
Before the execution S3, further comprise:
Determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；
When the voltage value of the DC bus is greater than preset under-voltage protection value, S3 is executed.
In embodiments of the present invention, and if only if the voltage value in DC bus be greater than preset under-voltage protection value (for example,
The voltage value 145VDC of DC bus is greater than under-voltage protection value 135VDC) when, frequency-changeable compressor is reduced by weak magnetic control
Counter electromotive force gives DC bus charge capacity phenomenon to avoid counter electromotive force, frequency conversion drive is kept to have inverter compressor motor
Effect control (that is, current oscillation do not occur), until frequency conversion drive related protection occurs and shuts down.
To sum up, in order to avoid frequency-changeable compressor oscillation phenomenon occurs when power down is shut down, the embodiment of the present invention will be straight
Stream busbar voltage decline process is divided into two stages and is handled:
First stage: the voltage value of DC bus is greater than preset regulated value；
Second stage: the voltage value of DC bus is no more than regulated value and is greater than preset under-voltage protection value,；
When the voltage of DC bus reduces range in the first stage: DC bus electricity can be improved using overmodulation technique
The utilization rate of pressure, improved as far as possible to the output voltage of frequency-changeable compressor, the minimum voltage for maintaining frequency-changeable compressor to need is avoided
Counter electromotive force charges to DC bus.
When the voltage of DC bus reduces range in second stage: compressor can be reduced by weak magnetic control technology
Counter electromotive force continues to avoid counter electromotive force to straight that is, by increasing the value range for being adjusted to coefficient, increase weak magnetic control modified tone rate
Stream bus from the phenomenon that occur, keep frequency conversion drive to effective control (current oscillation do not occur) of frequency-changeable compressor, work as change
When the output power of frequency compressor is not less than preset weak magnetoelectricity stream preset value, it can control frequency-changeable compressor and dropped by given pace
The slow-speed of revolution continues the phenomenon that avoiding counter electromotive force from charging to DC bus to further decrease the counter electromotive force of frequency-changeable compressor
Occur.
In order to more clearly illustrate technical solution of the present invention and advantage, below to one kind provided in an embodiment of the present invention
The processing method that frequency-changeable compressor power down is shut down is described in detail, as shown in Fig. 2, can specifically include following steps:
Step 201: when alternating current stops input voltage, determining in the waveform of the input current of frequency-changeable compressor whether occur
Shake waveform.
Specifically, when alternating current stops input voltage, it can first determine whether the input current of frequency-changeable compressor shakes
It swings, and if only if when the input current for determining frequency-changeable compressor shakes, determines the corresponding change of the voltage value of DC bus
The change stage, so as to avoid the counter electromotive force of frequency-changeable compressor from charging to DC bus according to corresponding changes phase, to avoid
Frequency-changeable compressor vibrates, when the input current for determining frequency-changeable compressor concussion does not occur, then without handling frequency conversion compression
Machine.
Step 202: when Sasser shape occurs in determination, determining whether the voltage value of DC bus is greater than preset adjusting
Otherwise value, executes step 203 if so, executing step 214.
It specifically,, can be true by comparing the voltage value of DC bus and regulated value when Sasser shape occurs in determination
Whether the voltage value for determining DC bus is greater than preset regulated value, in a manner of determining and frequency-changeable compressor is avoided to vibrate.
For example, by determining that the voltage value of DC bus is 310VDC, preset regulated value is 264VDC, therefore can
To determine that the voltage value 310VDC of DC bus is greater than regulated value 264VDC, it can be improved by overmodulation technique and give frequency compressor
Output voltage, avoid there is a phenomenon where counter electromotive force give DC bus charging.
Step 203: determining whether the voltage value of DC bus is greater than preset under-voltage protection value.
Specifically, when the voltage value of DC bus is not more than regulated value, it is also necessary to which determining the voltage value of DC bus is
It is no to be greater than preset under-voltage protection value, so as to determine whether to control the counter electromotive force for reducing frequency-changeable compressor by weak magnetic, avoid
The phenomenon that counter electromotive force charges to DC bus.When the voltage value of DC bus is not more than under-voltage protection value, can hold
The preset under-voltage protection operation of row, to avoid the operation for influencing frequency-changeable compressor.
Step 204: when the voltage value of DC bus is greater than preset under-voltage protection value, reducing the weak magnetic of frequency-changeable compressor
Control starting modified tone rate.
Specifically, it is reached the limit of when by overmodulation technique, and does not make the waveform of the input current of frequency-changeable compressor steady
It is fixed, or when the voltage value of DC bus is not more than preset regulated value, frequency conversion pressure can be reduced by weak magnetic control technology
The weak magnetic control starting modified tone rate of contracting machine avoids counter electromotive force from giving direct current mother so as to improve to the output voltage of frequency-changeable compressor
Line charge electricity.
Step 205: determine whether the waveform of the input current of frequency-changeable compressor is stable, if so, step 213 is executed, it is no
Then, step 206 is executed.
Specifically, by determining the waveform of the input current of frequency-changeable compressor, to determine the need for continuing through adjustment
Weak magnetic control starting modified tone rate, vibrates to avoid frequency-changeable compressor.
Step 206: determine whether the current value of weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if
It is return step 204, otherwise, executes step 207.
Specifically, when determining that the waveform of input current of frequency-changeable compressor is not stable, it is also necessary to control weak magnetic and start
The current value of modified tone rate is compared with preset modified tone rate setting value, to determine whether weak magnetic control starting modified tone rate is adjusted
The limit, and if only if can not continue through adjustment weak magnetic control starting modified tone rate come avoid counter electromotive force give DC bus charging
When, it can continue to avoid counter electromotive force to charge to DC bus by increasing the weak magnetoelectricity stream of frequency-changeable compressor.
Step 207: increasing the weak magnetoelectricity stream of frequency-changeable compressor.
Specifically, by increasing the weak magnetoelectricity stream of frequency-changeable compressor, the revolving speed of frequency-changeable compressor can be increased, and then increase
The power of frequency-changeable compressor avoids counter electromotive force from charging to DC bus to increase the output voltage of frequency-changeable compressor.
Step 208: determine whether the waveform of the input current of frequency-changeable compressor is stable, if so, step 213 is executed, it is no
Then, step 209 is executed.
Specifically, by determine frequency-changeable compressor input current waveform it is whether stable, so as to determine the need for after
The continuous weak magnetoelectricity stream by increasing frequency-changeable compressor avoids frequency-changeable compressor from vibrating.
Step 209: determining whether the current value of weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, returning
Step 207, otherwise, step 210 is executed.
Specifically, it when the waveform for the input current for determining frequency-changeable compressor is not stable, needs first to determine weak magnetoelectricity stream
Whether current value is less than preset weak magnetoelectricity stream preset value, to determine whether weak magnetoelectricity stream is adjusted to the limit.Weak magnetoelectricity stream also
When can continue to adjust, it can continue through and adjust weak magnetoelectricity stream to change to the output voltage of frequency-changeable compressor, to avoid anti-
The phenomenon that electromotive force charges to DC bus occurs.When weak magnetoelectricity stream is adjusted to the limit, the place to overload can be passed through
Reason avoids there is a phenomenon where counter electromotive force from charging to DC bus to realize reduction counter electromotive force.
Step 210: reducing the revolving speed of frequency-changeable compressor.
Specifically, by reducing the revolving speed of frequency-changeable compressor, the power of frequency-changeable compressor can be reduced, realizing reduces frequency conversion
The counter electromotive force of compressor.
Step 211: increasing the rate that frequency-changeable compressor slows down.
Specifically, by increasing the rate of the deceleration of frequency-changeable compressor, can accelerate frequency-changeable compressor reduces revolving speed, with to the greatest extent
The fast power for reducing frequency-changeable compressor, reduces counter electromotive force.
Step 212: determine whether the waveform of the input current of frequency-changeable compressor is stable, if so, step 213 is executed, it is no
Then, return step 210.
Specifically, by determining whether the waveform of the input current of frequency-changeable compressor is stable, to determine the need for continuing
Overload is adjusted, when the waveform of the input current in frequency-changeable compressor is not stable, again with biggish speed
Rate reduces frequency-changeable compressor revolving speed, and realizing reduces counter electromotive force, and generation counter electromotive force is avoided to charge to DC bus.
Step 213: terminating current process.
Step 214: reducing the lower limit value of the value range of the index of modulation.
Step 215: increasing the upper limit value of value range.
Specifically, by reducing the lower limit value of the value range of the index of modulation and increasing the upper limit value of value range, so that
Enter ovennodulation operational mode as early as possible, and utmostly extend the time of ovennodulation mode, to improve the benefit of DC bus-bar voltage
With rate, the counter electromotive force of frequency-changeable compressor is avoided to charge to DC bus.
Step 216: determine whether the waveform of the input current of frequency-changeable compressor is stable, if so, step 213 is executed, it is no
Then, step 217 is executed.
Specifically, by determining whether the waveform of the input current of frequency-changeable compressor is stable, to determine the need for again
The counter electromotive force is avoided to give DC bus charging by adjusting the value range of the index of modulation, or in the value model of the index of modulation
It encloses adjustment extremely to prescribe a time limit, the counter electromotive force of frequency-changeable compressor is reduced by weak magnetic control.
Step 217: determine whether upper limit value is less than preset ovennodulation limits value, if so, return step 214, otherwise,
Execute step 204.
As shown in figure 3, the embodiment of the invention provides the processing units that a kind of frequency-changeable compressor power down is shut down, comprising:
Waveform detection module 301, for executing S0: when alternating current stops input voltage, determining the input of frequency-changeable compressor
Whether concussion waveform is occurred in the waveform of electric current；
Voltage detection module 302, for executing S1: when the waveform detection module 301 determines the input of frequency-changeable compressor
When occurring concussion waveform in the waveform of electric current, determine whether the voltage value of DC bus is greater than preset regulated value, if so, touching
Ovennodulation control module 303 is sent out, otherwise, triggers weak magnetic control module 304；
The ovennodulation control module 303 when for being triggered, executing S2: increasing the value range of the index of modulation；
The weak magnetic control module 304 when for being triggered, executes S3: adjustment weak magnetic control modified tone rate and S4: increasing
Big overload frequency reducing rate.
In embodiments of the present invention, when alternating current, which powers off, stops input voltage, waveform detection module can be first passed through and determined
Whether the waveform of the input current of frequency-changeable compressor shakes, when the waveform for determining input current shakes, Ke Yitong
Zenith tracking module judges changes phase corresponding to d-c bus voltage value, that is, determines that the voltage value of DC bus is greater than
Preset regulated value is also less than the regulated value；When the voltage value for determining DC bus is greater than the regulated value, can pass through
Modulation control module increases the value range of the index of modulation, so as to improve compress to frequency conversion as far as possible into ovennodulation operational mode
The phenomenon that machine drives output voltage, the minimum voltage for maintaining frequency-changeable compressor to need, and counter electromotive force is avoided to charge to DC bus
Occur, and then frequency-changeable compressor is avoided oscillation phenomenon occur；And when the voltage value of DC bus is not more than the regulated value, it can be with
Weak magnetic is adjusted by weak magnetic control module and controls modified tone rate and increase overload frequency reducing rate, reduces frequency-changeable compressor to realize
Counter electromotive force, the phenomenon that avoiding counter electromotive force from charging to DC bus, avoid frequency-changeable compressor from vibrating to realize
Phenomenon.
In an embodiment of the present invention, the ovennodulation control module, for executing:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: it triggers the waveform detection module and determines whether the waveform of the input current of the frequency-changeable compressor is stable, such as
Fruit is to execute D5, otherwise, executes D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes
S3；
D5: terminate current process.
In an embodiment of the present invention, the weak magnetic control module, is further used for executing:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: it triggers the waveform detection module and determines whether the waveform of the input current of the frequency-changeable compressor is stable, such as
Fruit is to execute Q4, otherwise, executes Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, returning
Otherwise Q1 executes S4；
Q4: terminate current process.
In an embodiment of the present invention, the weak magnetic control module, for executing:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes
X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if
It is to return to X1, otherwise, executes Q1；
X4: terminate current process.
In an embodiment of the present invention, the weak magnetic control module, for executing:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns
C1；
C4: terminate current process.
In an embodiment of the present invention, the voltage detection module is further used for when the electricity for determining the DC bus
When pressure value is not more than preset low voltage value, determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；When
When the voltage value of the DC bus is greater than preset under-voltage protection value, weak magnetic control module is triggered.
The each embodiment of the present invention at least has the following beneficial effects:
1, the defeated of frequency-changeable compressor can be first determined when alternating current, which powers off, stops input voltage in one embodiment of the invention
Whether the waveform for entering electric current shakes, when the waveform for determining input current shakes, it can be determined that DC bus-bar voltage
The corresponding changes phase of value determines that the voltage value of DC bus is greater than preset regulated value and is also less than the regulated value；
When determine DC bus voltage value be greater than the regulated value when, can by increase the index of modulation value range so that into
Ovennodulation operational mode improves drive output voltage to frequency-changeable compressor as far as possible, the minimum voltage for maintaining frequency-changeable compressor to need,
The phenomenon that avoiding counter electromotive force from charging to DC bus, and then frequency-changeable compressor is avoided oscillation phenomenon occur；And work as direct current
When the voltage value of bus is not more than the regulated value, modified tone rate can be controlled by adjusting weak magnetic and increases overload frequency reducing rate,
To realize the counter electromotive force for reducing frequency-changeable compressor, the phenomenon that avoiding counter electromotive force from charging to DC bus, to realize
Frequency-changeable compressor is avoided oscillation phenomenon occur.
2, in one embodiment of the invention, by reducing the lower limit value of tone pitch coefficient value range (for example, reducing modified tone threshold
Value), and increase the upper limit value (for example, increasing modified tone rate limits value) of index of modulation value range, ovennodulation can be entered as early as possible
Mode, improves the utilization rate of DC bus-bar voltage, utmostly improves and gives frequency-changeable compressor output voltage, maintains frequency-changeable compressor
The minimum voltage needed, the phenomenon that avoiding counter electromotive force from charging to DC bus.Avoid the upper of index of modulation value range
Limit value is greater than preset ovennodulation limits value, and output voltage can be made more stable.And when the upper limit value of tone pitch coefficient is not less than
When ovennodulation limits value, can control modified tone rate by adjusting weak magnetic reduces the counter electromotive force of frequency-changeable compressor, to avoid anti-electricity
Kinetic potential charges to DC bus, so that frequency-changeable compressor be avoided oscillation phenomenon occur.
3, in one embodiment of the invention, by increasing the weak magnetoelectricity stream of frequency-changeable compressor (for example, increasing the limitation of D shaft current
Value), increase the revolving speed of frequency-changeable compressor, and then increase the power of frequency-changeable compressor, to improve to the output electricity of frequency-changeable compressor
Pressure avoids the counter electromotive force of frequency-changeable compressor from charging to DC bus.When the weak magnetoelectricity stream of frequency-changeable compressor is adjusted to the limit,
The counter electromotive force of frequency-changeable compressor can be further decreased by increasing overload frequency reducing rate, gone out to avoid frequency-changeable compressor
The phenomenon that now vibration is even demagnetized.
4, in one embodiment of the invention, by reducing the weak magnetic control starting modified tone rate of frequency-changeable compressor, can be improved to
The output voltage of frequency-changeable compressor charges to avoid the counter electromotive force of frequency-changeable compressor to DC bus, to avoid frequency conversion pressure
There is the phenomenon that vibration is even demagnetized in contracting machine.
5, in one embodiment of the invention, by reducing the revolving speed of frequency-changeable compressor, and accelerate frequency-changeable compressor deceleration
The counter electromotive force for reducing frequency-changeable compressor equally may be implemented in rate, and generation counter electromotive force is avoided to show to what DC bus charged
As to eliminate the current oscillation of frequency-changeable compressor power down stopping process.
6, in one embodiment of the invention, it is greater than preset under-voltage protection value (example and if only if the voltage value in DC bus
Such as, the voltage value 145VDC of DC bus is greater than under-voltage protection value 135VDC) when, frequency-changeable compressor is reduced by weak magnetic control
Counter electromotive force, give DC bus charge capacity phenomenon to avoid counter electromotive force, keep frequency conversion drive to inverter compressor motor
Effectively control (that is, current oscillation do not occur), until frequency conversion drive related protection occurs and shuts down.
It should be noted that, in this document, such as first and second etc relational terms are used merely to an entity
Or operation is distinguished with another entity or operation, is existed without necessarily requiring or implying between these entities or operation
Any actual relationship or order.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment for including a series of elements not only includes those elements,
It but also including other elements that are not explicitly listed, or further include solid by this process, method, article or equipment
Some elements.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including
There is also other identical factors in the process, method, article or equipment of the element.
Finally, it should be noted that the foregoing is merely presently preferred embodiments of the present invention, it is merely to illustrate skill of the invention
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., are included within the scope of protection of the present invention.
Claims (10)
1. the processing method that a kind of frequency-changeable compressor power down is shut down characterized by comprising
S0: when alternating current stops input voltage, determine whether occur concussion waveform in the waveform of the input current of frequency-changeable compressor；
S1: when determining appearance concussion waveform in the waveform of input current of frequency-changeable compressor, the voltage value of DC bus is determined
Whether it is greater than preset regulated value, if so, executing S2, otherwise, executes S3；
S2: increase the value range of the index of modulation；
S3: adjustment weak magnetic controls modified tone rate, executes S4；
S4: increase overload frequency reducing rate.
2. the processing method that frequency-changeable compressor power down according to claim 1 is shut down, which is characterized in that
The S2, comprising:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing D5, otherwise, executes D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes S3；
D5: terminate current process.
3. the processing method that frequency-changeable compressor power down according to claim 1 is shut down, which is characterized in that
After the S3, before the S4, further comprise:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing Q4, otherwise, executes Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, Q1 is returned, it is no
Then, S4 is executed；
Q4: terminate current process.
4. the processing method that frequency-changeable compressor power down according to claim 3 is shut down, which is characterized in that
The adjustment weak magnetic controls modified tone rate, comprising:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if so, returning
X1 is returned, otherwise, executes Q1；
X4: terminate current process.
5. according to claim 1 to the processing method that any frequency-changeable compressor power down in 4 is shut down, which is characterized in that
The S4, comprising:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns to C1；
C4: terminate current process；
And/or
When determining the voltage value of the DC bus no more than preset low voltage value,
Before the execution S3, further comprise:
Determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；
When the voltage value of the DC bus is greater than preset under-voltage protection value, S3 is executed.
6. the processing unit that a kind of frequency-changeable compressor power down is shut down characterized by comprising
Waveform detection module, for executing S0: when alternating current stops input voltage, determining the wave of the input current of frequency-changeable compressor
Whether concussion waveform is occurred in shape；
Voltage detection module, for executing S1: when the waveform detection module determines the waveform of the input current of frequency-changeable compressor
When middle appearance concussion waveform, determine whether the voltage value of DC bus is greater than preset regulated value, if so, triggering ovennodulation control
Otherwise molding block triggers weak magnetic control module；
The ovennodulation control module when for being triggered, executing S2: increasing the value range of the index of modulation；
The weak magnetic control module when for being triggered, executes S3: adjustment weak magnetic control modified tone rate and S4: increasing overload
Frequency reducing rate.
7. the processing unit that frequency-changeable compressor power down according to claim 6 is shut down, which is characterized in that
The ovennodulation control module, for executing:
D1: the lower limit value of the value range of the index of modulation is reduced；
D2: increase the upper limit value of the value range；
D3: triggering the waveform detection module and determine whether the waveform of the input current of the frequency-changeable compressor is stable, if so,
D5 is executed, otherwise, executes D4；
D4: determining whether the upper limit value is less than preset ovennodulation limits value, if so, returning to D1, otherwise, executes S3；
D5: terminate current process.
8. the processing unit that frequency-changeable compressor power down according to claim 6 is shut down, which is characterized in that
The weak magnetic control module, is further used for executing:
Q1: increase the weak magnetoelectricity stream of the frequency-changeable compressor；
Q2: triggering the waveform detection module and determine whether the waveform of the input current of the frequency-changeable compressor is stable, if so,
Q4 is executed, otherwise, executes Q3；
Q3: determining whether the current value of the weak magnetoelectricity stream is less than preset weak magnetoelectricity stream preset value, if so, Q1 is returned, it is no
Then, S4 is executed；
Q4: terminate current process.
9. the processing unit that frequency-changeable compressor power down according to claim 8 is shut down, which is characterized in that
The weak magnetic control module, for executing:
X1: the weak magnetic control starting modified tone rate of the frequency-changeable compressor is reduced；
X2: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing X4, otherwise, executes X3；
X3: determining whether the current value of the weak magnetic control starting modified tone rate is less than preset modified tone rate setting value, if so, returning
X1 is returned, otherwise, executes Q1；
X4: terminate current process.
10. the processing unit shut down according to the frequency-changeable compressor power down any in claim 6 to 9, which is characterized in that
The weak magnetic control module, for executing:
C1: the revolving speed of the frequency-changeable compressor is reduced；
C2: increase the rate that the frequency-changeable compressor slows down；
C3: determining whether the waveform of the input current of the frequency-changeable compressor is stable, if so, executing C4, otherwise, returns to C1；
C4: terminate current process；
And/or
The voltage detection module is further used for being not more than preset low voltage value when the voltage value for determining the DC bus
When, determine whether the voltage value of the DC bus is greater than preset under-voltage protection value；When the voltage value of the DC bus is big
When preset under-voltage protection value, weak magnetic control module is triggered.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179051A (en) * | 2021-04-28 | 2021-07-27 | 一巨自动化装备（上海）有限公司 | Soft switching control method for parking actuator |
| WO2023155443A1 (en) * | 2022-02-18 | 2023-08-24 | 青岛海尔空调器有限总公司 | Method and apparatus for controlling direct-current air conditioner, and air conditioner |
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| US20150155805A1 (en) * | 2012-04-12 | 2015-06-04 | Hitachi, Ltd. | Electric Motor Drive Device |
| CN106208869A (en) * | 2016-07-13 | 2016-12-07 | 广东美的制冷设备有限公司 | No electrolytic capacitor motor driven systems and control method, device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150155805A1 (en) * | 2012-04-12 | 2015-06-04 | Hitachi, Ltd. | Electric Motor Drive Device |
| CN106208869A (en) * | 2016-07-13 | 2016-12-07 | 广东美的制冷设备有限公司 | No electrolytic capacitor motor driven systems and control method, device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113179051A (en) * | 2021-04-28 | 2021-07-27 | 一巨自动化装备（上海）有限公司 | Soft switching control method for parking actuator |
| WO2023155443A1 (en) * | 2022-02-18 | 2023-08-24 | 青岛海尔空调器有限总公司 | Method and apparatus for controlling direct-current air conditioner, and air conditioner |
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