CN109713978B - Processing method and device for power-down shutdown of variable frequency compressor - Google Patents
Processing method and device for power-down shutdown of variable frequency compressor Download PDFInfo
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- CN109713978B CN109713978B CN201910065238.5A CN201910065238A CN109713978B CN 109713978 B CN109713978 B CN 109713978B CN 201910065238 A CN201910065238 A CN 201910065238A CN 109713978 B CN109713978 B CN 109713978B
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Abstract
The invention provides a processing method and a device for power-down shutdown of a variable frequency compressor, which comprises the following steps: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor; when the oscillation waveform appears in the waveform of the input current of the variable frequency compressor, whether the voltage value of the direct current bus is larger than a preset regulating value or not is determined, if yes, the value range of the modulation coefficient is enlarged, otherwise, the weak magnetic control modulation rate is adjusted, and the overload frequency reduction rate is increased. This scheme can avoid inverter compressor to appear vibrating when the electricity shuts down.
Description
Technical Field
The invention relates to the technical field of variable frequency driving, in particular to a method and a device for processing power failure shutdown of a variable frequency compressor.
Background
At present, the inverter compressor of intelligence household electrical appliances can be sent the order by the master control and require variable frequency drive to stop output when normally shutting down, and variable frequency output voltage is greater than the counter electromotive force of compressor this moment, and inverter compressor's counter electromotive force can not charge for direct current bus, and the oscillation phenomenon can not appear in inverter compressor phase current.
However, when the shut down of commercial power sudden failure, before the relevant protection does not appear, the variable frequency drive still operates according to master control instruction, along with the reduction of direct current bus voltage, variable frequency drive's output voltage can follow and reduce, and when variable frequency compressor's back electromotive force was greater than output voltage, back electromotive force can charge to direct current bus, and variable frequency drive was still continuing work this moment to lead to variable frequency compressor vibration phenomenon to appear.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing power-down shutdown of a variable frequency compressor, which can avoid vibration of the variable frequency compressor during power-down shutdown.
In a first aspect, an embodiment of the present invention provides a method for processing a shutdown of an inverter compressor in a power failure mode, where the method includes:
s0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
s1: when the oscillation waveform appears in the waveform of the input current of the inverter compressor, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, executing S2, otherwise, executing S3;
s2: increasing the value range of the modulation coefficient;
s3: adjusting the flux weakening control tone variation rate, and executing S4;
s4: the overload downconversion rate is increased.
Preferably, the first and second electrodes are formed of a metal,
the S2, including:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
after the S3, before the S4, further comprising:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the adjusting weak magnetic control modulation rate comprises the following steps:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the S4, including:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: ending the current flow; .
Preferably, the first and second electrodes are formed of a metal,
when the voltage value of the direct current bus is determined not to be larger than the preset low voltage value,
prior to the performing S3, further comprising:
determining whether the voltage value of the direct current bus is larger than a preset undervoltage protection value;
and executing S3 when the voltage value of the direct current bus is greater than the preset undervoltage protection value.
In a second aspect, an embodiment of the present invention provides a processing apparatus for shutdown of an inverter compressor in case of power failure, including:
a waveform detection module for performing S0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
a voltage detection module for performing S1: when the waveform detection module determines that an oscillation waveform occurs in the waveform of the input current of the variable frequency compressor, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, triggering the overmodulation control module, otherwise, triggering the weak magnetic control module;
the overmodulation control module, when triggered, executes S2: increasing the value range of the modulation coefficient;
the weak magnetic control module is used for executing S3: adjusting the flux weakening control pitch rate, and S4: the overload downconversion rate is increased.
Preferably, the first and second electrodes are formed of a metal,
the overmodulation control module is configured to perform:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the weak magnetic control module is further used for executing:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the weak magnetic control module is used for executing:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the weak magnetic control module is used for executing:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: the current flow is ended.
Preferably, the first and second electrodes are formed of a metal,
the voltage detection module is further used for determining whether the voltage value of the direct current bus is greater than a preset undervoltage protection value or not when the voltage value of the direct current bus is determined not to be greater than the preset low-voltage value; and when the voltage value of the direct current bus is greater than a preset undervoltage protection value, triggering the weak magnetic control module.
In the embodiment of the invention, when the mains supply is powered off and the input voltage is stopped, whether the waveform of the input current of the variable frequency compressor is oscillated or not can be determined firstly, and when the waveform of the input current is determined to be oscillated, the change stage corresponding to the voltage value of the direct current bus can be judged, namely, whether the voltage value of the direct current bus is greater than a preset regulating value or less than the regulating value is determined; when the voltage value of the direct current bus is determined to be larger than the adjusting value, the overmodulation operation mode can be entered by increasing the value range of the modulation coefficient, the driving output voltage of the variable frequency compressor is increased as much as possible, the minimum voltage required by the variable frequency compressor is maintained, the phenomenon that the direct current bus is charged by the counter electromotive force is avoided, and the vibration phenomenon of the variable frequency compressor is further avoided; when the voltage value of the direct current bus is not greater than the regulating value, the back electromotive force of the variable frequency compressor can be reduced by regulating the flux weakening control modulation rate and increasing the overload frequency reduction rate, the phenomenon that the back electromotive force charges the direct current bus is avoided, and the vibration phenomenon of the variable frequency compressor is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for processing a shutdown of an inverter compressor in case of power failure according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for processing a shutdown of an inverter compressor in case of power failure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a processing apparatus for power-down shutdown of an inverter compressor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for processing a shutdown of an inverter compressor in case of power failure, including:
s0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
s1: when the oscillation waveform appears in the waveform of the input current of the inverter compressor, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, executing S2, otherwise, executing S3;
s2: increasing the value range of the modulation coefficient;
s3: adjusting the flux weakening control tone variation rate, and executing S4;
s4: the overload downconversion rate is increased.
In the embodiment of the invention, when the mains supply is powered off and the input voltage is stopped, whether the waveform of the input current of the variable frequency compressor is oscillated or not can be determined firstly, and when the waveform of the input current is determined to be oscillated, the change stage corresponding to the voltage value of the direct current bus can be judged, namely, whether the voltage value of the direct current bus is greater than a preset regulating value or less than the regulating value is determined; when the voltage value of the direct current bus is determined to be larger than the adjusting value, the overmodulation operation mode can be entered by increasing the value range of the modulation coefficient, the driving output voltage of the variable frequency compressor is increased as much as possible, the minimum voltage required by the variable frequency compressor is maintained, the phenomenon that the direct current bus is charged by the counter electromotive force is avoided, and the vibration phenomenon of the variable frequency compressor is further avoided; when the voltage value of the direct current bus is not greater than the regulating value, the back electromotive force of the variable frequency compressor can be reduced by regulating the flux weakening control modulation rate and increasing the overload frequency reduction rate, the phenomenon that the back electromotive force charges the direct current bus is avoided, and the vibration phenomenon of the variable frequency compressor is avoided.
In an embodiment of the present invention, the S2 includes:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: the current flow is ended.
In the embodiment of the invention, the overmodulation mode can be entered as soon as possible by reducing the lower limit value of the value range of the modulation factor (for example, reducing the overmodulation threshold value) and increasing the upper limit value of the value range of the modulation factor (for example, increasing the modulation rate limit value), the utilization rate of the voltage of the direct-current bus is improved, the output voltage of the variable-frequency compressor is improved to the greatest extent, the minimum voltage required by the variable-frequency compressor is maintained, and the phenomenon that the direct-current bus is charged by the counter electromotive force is avoided. The upper limit value of the value range of the modulation coefficient is prevented from being larger than the preset overmodulation limit value, so that the output voltage is more stable. And when the upper limit value of the modulation factor is not less than the overmodulation limit value, the back electromotive force of the variable frequency compressor can be reduced by adjusting the flux weakening control modulation rate so as to prevent the back electromotive force from charging the direct current bus and further avoid the vibration phenomenon of the variable frequency compressor.
In an embodiment of the present invention, after the S3 and before the S4, the method further includes:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: the current flow is ended.
In the embodiment of the invention, the rotation speed of the inverter compressor is increased by increasing the field weakening current of the inverter compressor (for example, increasing the D-axis current limit value), so that the power of the inverter compressor is increased, the output voltage of the inverter compressor is increased, and the counter electromotive force of the inverter compressor is prevented from charging the direct current bus. When the weak magnetic current of the inverter compressor is adjusted to the limit, the back electromotive force of the inverter compressor can be further reduced by increasing the overload frequency reduction rate, so that the phenomenon of vibration and even demagnetization of the inverter compressor is avoided.
In an embodiment of the present invention, the adjusting the flux weakening control modulation rate includes:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: the current flow is ended.
In the embodiment of the invention, the starting modulation rate is controlled by reducing the weak magnetism of the inverter compressor, so that the output voltage of the inverter compressor can be improved, the counter electromotive force of the inverter compressor is prevented from charging the direct current bus, and the phenomenon of vibration and even demagnetization of the inverter compressor is avoided.
In an embodiment of the present invention, the S4 includes:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: the current flow is ended.
In the embodiment of the invention, the counter electromotive force of the variable frequency compressor can be reduced by reducing the rotating speed of the variable frequency compressor and accelerating the speed reduction of the variable frequency compressor, so that the phenomenon that the counter electromotive force charges a direct current bus is avoided, and the current oscillation of the variable frequency compressor in the power-down shutdown process is eliminated.
In an embodiment of the invention, when the voltage value of the direct current bus is determined not to be greater than the preset low voltage value,
prior to the performing S3, further comprising:
determining whether the voltage value of the direct current bus is larger than a preset undervoltage protection value;
and executing S3 when the voltage value of the direct current bus is greater than the preset undervoltage protection value.
In the embodiment of the invention, when and only when the voltage value of the direct current bus is greater than the preset undervoltage protection value (for example, the voltage value of the direct current bus is 145VDC greater than the undervoltage protection value of 135VDC), the back electromotive force of the variable frequency compressor is reduced through the field weakening control, so that the phenomenon that the back electromotive force charges the direct current bus is avoided, and the effective control of the variable frequency drive on the motor of the variable frequency compressor is maintained (namely, no current oscillation occurs) until the variable frequency drive is shut down due to the occurrence of relevant protection.
In summary, in order to avoid the vibration phenomenon of the inverter compressor during power failure shutdown, the embodiment of the invention divides the voltage reduction process of the direct current bus into two stages for processing:
the first stage is as follows: the voltage value of the direct current bus is greater than a preset adjusting value;
and a second stage: the voltage value of the direct current bus is not more than the regulating value and is more than a preset undervoltage protection value;
when the voltage reduction range of the direct current bus is in the first stage: the over-modulation technology can improve the utilization rate of the voltage of the direct current bus, so as to improve the output voltage of the variable frequency compressor as much as possible, maintain the minimum voltage required by the variable frequency compressor and avoid the counter electromotive force from charging the direct current bus.
When the voltage reduction range of the direct current bus is in the second stage: can reduce the counter electromotive force of compressor through weak magnetism control technique, adjust to the value scope of coefficient through increasing promptly, increase weak magnetism control modulation rate, continue to avoid counter electromotive force to take place for the phenomenon of direct current bus from the point, keep frequency conversion drive to frequency conversion compressor's effective control (the current oscillation does not appear), when frequency conversion compressor's output is not less than predetermined weak magnetism current default, can control frequency conversion compressor and reduce the rotational speed according to certain rate, with the counter electromotive force who further reduces frequency conversion compressor, continue to avoid counter electromotive force to take place for the phenomenon that direct current bus charges.
In order to more clearly illustrate the technical solution and advantages of the present invention, the following describes in detail a processing method for power down shutdown of an inverter compressor provided in an embodiment of the present invention, as shown in fig. 2, specifically including the following steps:
step 201: and when the mains supply stops inputting the voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor.
Specifically, when the commercial power stops the input voltage, whether the input current of the variable frequency compressor vibrates or not can be determined firstly, if and only if the input current of the variable frequency compressor vibrates, the change stage corresponding to the voltage value of the direct current bus is determined, so that the back electromotive force of the variable frequency compressor is prevented from charging the direct current bus according to the corresponding change stage, vibration of the variable frequency compressor is prevented, and when the input current of the variable frequency compressor does not vibrate, the variable frequency compressor does not need to be processed.
Step 202: when the oscillation waveform is determined to occur, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, executing step 214, otherwise, executing step 203.
Specifically, when the oscillation waveform is determined to occur, by comparing the voltage value of the dc bus with the adjustment value, it may be determined whether the voltage value of the dc bus is greater than a preset adjustment value, so as to determine a manner of avoiding vibration of the inverter compressor.
For example, by determining that the voltage value of the direct current bus is 310VDC and the preset adjusting value is 264VDC, the voltage value of the direct current bus 310VDC can be determined to be greater than the adjusting value 264VDC, the output voltage of the frequency-feeding compressor can be increased through an overmodulation technology, and the phenomenon that the direct current bus is charged by the back electromotive force is avoided.
Step 203: and determining whether the voltage value of the direct current bus is greater than a preset undervoltage protection value.
Specifically, when the voltage value of the dc bus is not greater than the adjustment value, it is further determined whether the voltage value of the dc bus is greater than a preset undervoltage protection value, so as to determine whether the back electromotive force of the inverter compressor is reduced through weak magnetic control, and avoid the occurrence of a phenomenon that the back electromotive force charges the dc bus. When the voltage value of the direct current bus is not greater than the undervoltage protection value, the preset undervoltage protection operation can be executed to avoid influencing the operation of the variable frequency compressor.
Step 204: and when the voltage value of the direct current bus is greater than the preset undervoltage protection value, reducing the field weakening control starting modulation rate of the variable frequency compressor.
Specifically, when the overmodulation technology reaches the limit and the waveform of the input current of the inverter compressor is not stabilized, or when the voltage value of the direct current bus is not greater than the preset regulation value, the field weakening control starting modulation rate of the inverter compressor can be reduced through the field weakening control technology, so that the output voltage of the inverter compressor is increased, and the direct current bus is prevented from being charged by the counter electromotive force.
Step 205: and (4) determining whether the waveform of the input current of the inverter compressor is stable, if so, executing the step 213, otherwise, executing the step 206.
Specifically, the waveform of the input current of the inverter compressor is determined to determine whether the start of the modulation rate is required to be continued by adjusting the field weakening control so as to avoid the vibration of the inverter compressor.
Step 206: and (4) determining whether the current value of the dimming rate of the start of the field weakening control is smaller than a preset dimming rate set value, if so, returning to the step 204, otherwise, executing the step 207.
Specifically, when it is determined that the waveform of the input current of the inverter compressor is unstable, the current value of the start-up modulation rate of the field weakening control needs to be compared with a preset modulation rate set value to determine whether the start-up modulation rate of the field weakening control is adjusted to a limit, and if and only if the start-up modulation rate of the field weakening control cannot be continuously adjusted to avoid the back electromotive force from charging the dc bus, the back electromotive force can be continuously prevented from charging the dc bus by increasing the field weakening current of the inverter compressor.
Step 207: and increasing the field weakening current of the variable frequency compressor.
Specifically, through the weak magnetic current of increase inverter compressor, can increase inverter compressor's rotational speed, and then increase inverter compressor's power to increase inverter compressor's output voltage, avoid back electromotive force to charge for direct current bus.
Step 208: and (4) determining whether the waveform of the input current of the inverter compressor is stable, if so, executing step 213, otherwise, executing step 209.
Specifically, whether the waveform of the input current of the inverter compressor is stable or not is determined so as to determine whether the inverter compressor needs to be continuously prevented from vibrating by increasing the weak magnetic current of the inverter compressor or not.
Step 209: and (4) determining whether the current value of the field weakening current is smaller than a preset field weakening current preset value, if so, returning to the step 207, otherwise, executing the step 210.
Specifically, when it is determined that the waveform of the input current of the inverter compressor is not stable, it is first determined whether the current value of the field weakening current is smaller than a preset field weakening current value to determine whether the field weakening current is adjusted to a limit. When the flux weakening current can be continuously adjusted, the output voltage of the variable frequency compressor can be continuously changed by adjusting the flux weakening current, so that the phenomenon that the direct current bus is charged by the back electromotive force is avoided. When the weak magnetic current is adjusted to the limit, the counter electromotive force can be reduced through processing the overload, and the phenomenon that the counter electromotive force charges the direct current bus is avoided.
Step 210: and reducing the rotating speed of the variable frequency compressor.
Specifically, by reducing the rotating speed of the inverter compressor, the power of the inverter compressor can be reduced, and the reduction of the back electromotive force of the inverter compressor is realized.
Step 211: increasing the speed of the inverter compressor.
Specifically, the speed reduction rate of the inverter compressor is increased, so that the rotating speed of the inverter compressor can be increased, the power of the inverter compressor can be reduced as soon as possible, and the counter electromotive force can be reduced.
Step 212: and (6) determining whether the waveform of the input current of the inverter compressor is stable, if so, executing the step 213, otherwise, returning to the step 210.
Specifically, whether the waveform of the input current of the inverter compressor is stable or not is determined, so that whether the overload needs to be continuously adjusted or not is determined, and if and only if the waveform of the input current of the inverter compressor is not stable, the rotating speed of the inverter compressor is reduced at a higher speed again, the reduction of the counter electromotive force is realized, and the counter electromotive force is prevented from charging the direct-current bus.
Step 213: the current flow is ended.
Step 214: and reducing the lower limit value of the value range of the modulation coefficient.
Step 215: the upper limit value of the value range is increased.
Specifically, the overmodulation operation mode is started as soon as possible by reducing the lower limit value of the value range of the modulation coefficient and increasing the upper limit value of the value range, the time of the overmodulation mode is prolonged to the maximum extent, the utilization rate of the voltage of the direct-current bus is improved, and the direct-current bus is prevented from being charged by the counter electromotive force of the variable-frequency compressor.
Step 216: and (4) determining whether the waveform of the input current of the inverter compressor is stable, if so, executing step 213, otherwise, executing step 217.
Specifically, whether the waveform of the input current of the inverter compressor is stable is determined to determine whether the back electromotive force is required to be prevented from charging the direct-current bus by adjusting the value range of the modulation coefficient again, or when the value range of the modulation coefficient is adjusted to the limit, the back electromotive force of the inverter compressor is reduced by weak magnetic control.
Step 217: it is determined whether the upper limit value is less than a preset overmodulation limit value and, if so, returns to step 214, otherwise, step 204 is performed.
As shown in fig. 3, an embodiment of the present invention provides a processing apparatus for shutdown of an inverter compressor, including:
a waveform detection module 301, configured to execute S0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
a voltage detection module 302 for executing S1: when the waveform detection module 301 determines that an oscillation waveform occurs in the waveform of the input current of the inverter compressor, determining whether the voltage value of the direct current bus is greater than a preset regulation value, if so, triggering the overmodulation control module 303, otherwise, triggering the weak magnetic control module 304;
the overmodulation control module 303 is configured to, when triggered, perform S2: increasing the value range of the modulation coefficient;
the weak magnetic control module 304, configured to execute, when triggered, S3: adjusting the flux weakening control pitch rate, and S4: the overload downconversion rate is increased.
In the embodiment of the invention, when the mains supply is powered off and the input voltage is stopped, whether the waveform of the input current of the variable frequency compressor is oscillated or not can be determined through the waveform detection module, and when the waveform of the input current is oscillated, the change stage corresponding to the voltage value of the direct current bus can be judged through the voltage detection module, namely, whether the voltage value of the direct current bus is greater than a preset regulating value or less than the regulating value is determined; when the voltage value of the direct current bus is determined to be larger than the adjusting value, the value range of the modulation coefficient can be enlarged through the overmodulation control module, so that the overmodulation operation mode is entered, the driving output voltage of the variable frequency compressor is improved as much as possible, the minimum voltage required by the variable frequency compressor is maintained, the phenomenon that the direct current bus is charged by the counter electromotive force is avoided, and the vibration phenomenon of the variable frequency compressor is avoided; when the voltage value of the direct current bus is not greater than the regulating value, the flux weakening control module can be used for adjusting the flux weakening control modulation rate and increasing the overload frequency reduction rate to reduce the back electromotive force of the variable frequency compressor, so that the phenomenon that the back electromotive force charges the direct current bus is avoided, and the phenomenon of vibration of the variable frequency compressor is avoided.
In an embodiment of the present invention, the overmodulation control module is configured to perform:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: the current flow is ended.
In an embodiment of the present invention, the weak magnetic control module is further configured to execute:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: the current flow is ended.
In an embodiment of the present invention, the weak magnetic control module is configured to perform:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: the current flow is ended.
In an embodiment of the present invention, the weak magnetic control module is configured to perform:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: the current flow is ended.
In an embodiment of the present invention, the voltage detection module is further configured to determine whether the voltage value of the dc bus is greater than a preset under-voltage protection value when it is determined that the voltage value of the dc bus is not greater than the preset low-voltage value; and when the voltage value of the direct current bus is greater than a preset undervoltage protection value, triggering the weak magnetic control module.
The embodiments of the invention have at least the following beneficial effects:
1. in an embodiment of the present invention, when the commercial power is turned off and the input voltage is stopped, it may be determined whether the waveform of the input current of the inverter compressor is oscillated, and when it is determined that the waveform of the input current is oscillated, the change stage corresponding to the voltage value of the dc bus may be determined, that is, it is determined whether the voltage value of the dc bus is greater than the preset regulation value or less than the regulation value; when the voltage value of the direct current bus is determined to be larger than the adjusting value, the overmodulation operation mode can be entered by increasing the value range of the modulation coefficient, the driving output voltage of the variable frequency compressor is increased as much as possible, the minimum voltage required by the variable frequency compressor is maintained, the phenomenon that the direct current bus is charged by the counter electromotive force is avoided, and the vibration phenomenon of the variable frequency compressor is further avoided; when the voltage value of the direct current bus is not greater than the regulating value, the back electromotive force of the variable frequency compressor can be reduced by regulating the flux weakening control modulation rate and increasing the overload frequency reduction rate, the phenomenon that the back electromotive force charges the direct current bus is avoided, and the vibration phenomenon of the variable frequency compressor is avoided.
2. In an embodiment of the present invention, by decreasing the lower limit value of the value range of the modulation factor (for example, decreasing the over-modulation threshold value) and increasing the upper limit value of the value range of the modulation factor (for example, increasing the modulation rate limit value), the over-modulation mode can be entered as soon as possible, the utilization rate of the dc bus voltage is increased, the output voltage to the inverter compressor is increased to the maximum extent, the minimum voltage required by the inverter compressor is maintained, and the phenomenon that the dc bus is charged by the back electromotive force is avoided. The upper limit value of the value range of the modulation coefficient is prevented from being larger than the preset overmodulation limit value, so that the output voltage is more stable. And when the upper limit value of the modulation factor is not less than the overmodulation limit value, the back electromotive force of the variable frequency compressor can be reduced by adjusting the flux weakening control modulation rate so as to prevent the back electromotive force from charging the direct current bus and further avoid the vibration phenomenon of the variable frequency compressor.
3. In an embodiment of the present invention, the flux weakening current of the inverter compressor is increased (for example, the D-axis current limit value is increased), so as to increase the rotation speed of the inverter compressor, and further increase the power of the inverter compressor, thereby increasing the output voltage to the inverter compressor and preventing the back electromotive force of the inverter compressor from charging the dc bus. When the weak magnetic current of the inverter compressor is adjusted to the limit, the back electromotive force of the inverter compressor can be further reduced by increasing the overload frequency reduction rate, so that the phenomenon of vibration and even demagnetization of the inverter compressor is avoided.
4. In an embodiment of the present invention, the start-up modulation rate is controlled by reducing the field weakening of the inverter compressor, so that the output voltage of the inverter compressor can be increased, the back electromotive force of the inverter compressor is prevented from charging the dc bus, and the inverter compressor is prevented from vibrating and even demagnetizing.
5. In an embodiment of the invention, the counter electromotive force of the inverter compressor can be reduced by reducing the rotating speed of the inverter compressor and accelerating the speed reduction rate of the inverter compressor, so that the phenomenon that the counter electromotive force charges a direct current bus is avoided, and the current oscillation of the inverter compressor in the power-down shutdown process is eliminated.
6. In an embodiment of the present invention, if and only if the voltage value of the dc bus is greater than the preset undervoltage protection value (for example, the voltage value of the dc bus is 145VDC greater than the undervoltage protection value of 135VDC), the back electromotive force of the inverter compressor is reduced through the field-weakening control, so as to avoid the back electromotive force from charging the dc bus, and maintain the effective control of the inverter drive on the motor of the inverter compressor (i.e., no current oscillation occurs) until the inverter drive is shut down due to the occurrence of the related protection.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A processing method for the power-down shutdown of a variable frequency compressor is characterized by comprising the following steps:
s0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
s1: when the oscillation waveform appears in the waveform of the input current of the inverter compressor, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, executing S2, otherwise, executing S3;
s2: increasing the value range of the modulation coefficient;
s3: adjusting the flux weakening control tone variation rate, and executing S4;
s4: increasing the overload downconversion rate;
wherein the content of the first and second substances,
the S2, including:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: ending the current flow;
after the S3, before the S4, further comprising:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: ending the current flow;
the adjusting weak magnetic control modulation rate comprises the following steps:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: ending the current flow;
the S4, including:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: the current flow is ended.
2. The method for handling the power down shutdown of the inverter compressor according to claim 1,
when the voltage value of the direct current bus is determined not to be larger than the preset low voltage value,
prior to the performing S3, further comprising:
determining whether the voltage value of the direct current bus is larger than a preset undervoltage protection value;
and executing S3 when the voltage value of the direct current bus is greater than the preset undervoltage protection value.
3. The utility model provides a processing apparatus that inverter compressor loses power and shuts down which characterized in that includes:
a waveform detection module for performing S0: when the mains supply stops inputting voltage, determining whether an oscillation waveform appears in the waveform of the input current of the variable frequency compressor;
a voltage detection module for performing S1: when the waveform detection module determines that an oscillation waveform occurs in the waveform of the input current of the variable frequency compressor, determining whether the voltage value of the direct current bus is greater than a preset adjusting value, if so, triggering the overmodulation control module, otherwise, triggering the weak magnetic control module;
the overmodulation control module, when triggered, executes S2: increasing the value range of the modulation coefficient;
the weak magnetic control module is used for executing S3: adjusting the flux weakening control pitch rate, and S4: increasing the overload downconversion rate;
the overmodulation control module is configured to perform:
d1: reducing the lower limit value of the value range of the modulation coefficient;
d2: increasing the upper limit value of the value range;
d3: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing D5, otherwise, executing D4;
d4: determining whether the upper limit value is smaller than a preset overmodulation limit value, if so, returning to D1, otherwise, executing S3;
d5: ending the current flow;
the weak magnetic control module is further used for executing:
q1: increasing the flux weakening current of the variable frequency compressor;
q2: triggering the waveform detection module to determine whether the waveform of the input current of the inverter compressor is stable, if so, executing Q4, otherwise, executing Q3;
q3: determining whether the current value of the flux weakening current is smaller than a preset flux weakening current value, if so, returning to Q1, otherwise, executing S4;
q4: ending the current flow;
the weak magnetic control module is used for executing:
x1: reducing the starting modulation rate of the weak magnetic control of the variable frequency compressor;
x2: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing X4, otherwise, executing X3;
x3: determining whether the current value of the dimming rate of the weak magnetic control starting is smaller than a preset dimming rate set value, if so, returning to X1, otherwise, executing Q1;
x4: ending the current flow;
the weak magnetic control module is used for executing:
c1: reducing the rotating speed of the variable frequency compressor;
c2: increasing a rate of speed reduction of the inverter compressor;
c3: determining whether the waveform of the input current of the inverter compressor is stable, if so, executing C4, otherwise, returning to C1;
c4: the current flow is ended.
4. The inverter compressor power-down shutdown processing device according to claim 3,
the voltage detection module is further used for determining whether the voltage value of the direct current bus is greater than a preset undervoltage protection value or not when the voltage value of the direct current bus is determined not to be greater than the preset low-voltage value; and when the voltage value of the direct current bus is greater than a preset undervoltage protection value, triggering the weak magnetic control module.
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