CN111396299A - Compressor drive control method and device - Google Patents

Compressor drive control method and device Download PDF

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Publication number
CN111396299A
CN111396299A CN202010243752.6A CN202010243752A CN111396299A CN 111396299 A CN111396299 A CN 111396299A CN 202010243752 A CN202010243752 A CN 202010243752A CN 111396299 A CN111396299 A CN 111396299A
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Prior art keywords
compressor
rotating speed
phase voltage
pwm output
voltage
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CN111396299B (en
Inventor
贾新旭
邵海柱
耿焱
时斌
丛安平
张波
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a compressor drive control method and a device, wherein the method comprises the following steps: when the compressor runs, acquiring a three-phase voltage output instruction acquired by vector calculation in a compressor drive control system; determining whether PWM output saturation occurs according to the three-phase voltage output instruction; if no PWM output saturation occurs, controlling the compressor to operate at a set rotating speed; if PWM output is saturated, entering a frequency limiting mode, and controlling the compressor to operate at the actual rotating speed in the frequency limiting mode; and the actual rotating speed in the frequency limiting mode is less than the set rotating speed. By applying the invention, the technical problem that the compressor stops running due to PWM output saturation in the compressor driving system can be solved.

Description

Compressor drive control method and device
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a compressor drive control method and device.
Background
At present, in the field of air conditioner compressor driving, a variable frequency driving mode is widely adopted. The frequency conversion is to rectify single-phase or three-phase electricity into direct current and then invert the direct current into UVW three-phase electricity through a power module to drive a motor.
In the variable frequency drive, when the voltage fluctuation of the power supply is large and sudden drop or rise occurs, the problem of PWM output saturation is easily caused. When the PWM output is saturated, the output is fixed, so that the error of vector calculation is increased, and the three-phase voltage of the compressor is determined to be wrong according to the vector calculation result, so that the compressor stops running, and even the problem of demagnetization of the compressor is caused. This phenomenon is particularly evident in a compressor driving system without electrolytic capacitor because of the use of a non-electrolytic capacitor, which reduces the capacitance of the capacitor and causes the bus voltage to fluctuate severely due to the faster charging and discharging of the capacitor. Particularly, the power supply voltage is more obvious when the power supply voltage drops sharply, so that the compressor is more easily stopped to influence the normal operation of the air conditioner.
Disclosure of Invention
The invention aims to provide a compressor driving control method and device to solve the problem that the compressor stops running due to PWM output saturation in a compressor driving system.
In order to achieve the purpose, the compressor driving control method provided by the invention is realized by adopting the following technical scheme:
a compressor drive control method comprising:
when the compressor runs, acquiring a three-phase voltage output instruction acquired by vector calculation in a compressor drive control system;
determining whether PWM output saturation occurs according to the three-phase voltage output instruction;
if no PWM output saturation occurs, controlling the compressor to operate at a set rotating speed;
if PWM output is saturated, entering a frequency limiting mode, and controlling the compressor to operate at the actual rotating speed in the frequency limiting mode; and the actual rotating speed in the frequency limiting mode is less than the set rotating speed.
The method for controlling the driving of the compressor determines whether PWM output saturation occurs according to the three-phase voltage output command, and specifically includes:
normalizing each phase voltage output instruction in the three-phase voltage output instructions according to the direct-current bus voltage to obtain three normalized phase voltage outputs;
comparing each of said normalized phase voltage outputs to a known maximum output voltage;
if the phase voltage after the normalization processing is larger than the maximum output voltage, determining that the phase voltage overflows;
and if at least one phase voltage subjected to normalization processing continuously overflows for a set number of times, determining that PWM output saturation occurs.
According to the compressor drive control method, each phase voltage output instruction in the three-phase voltage output instructions is respectively subjected to normalization processing according to the voltage of the direct current bus, so that three phase voltage outputs after normalization processing are obtained, and the method specifically comprises the following steps:
setting each phase voltage output command as Vo, the direct current bus voltage as Vdc and the normalized phase voltage as Vout, and determining Vout by adopting the following method:
Figure 100002_DEST_PATH_IMAGE002
。
the compressor drive control method as described above, further comprising:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)];
Vdc1for a known rated DC bus voltage, VpIs a known bias voltage.
The compressor drive control method as described above, further comprising:
after the actual rotating speed w in the frequency limiting mode is determined, comparing the actual rotating speed w with the known lowest rotating speed of the compressor;
if the actual rotating speed w is less than the lowest rotating speed, updating the lowest rotating speed by using the actual rotating speed w;
the method further comprises the following steps:
if the current DC bus voltage V is detecteddc0Greater than the rated DC bus voltage Vdc1Then, the current DC bus voltage V is enableddc0For said rated DC bus voltage Vdc1And then calculating the actual rotating speed w in the frequency limiting mode.
The compressor drive control method as described above, further comprising:
and starting timing from entering the frequency limiting mode, and after the timing time reaches the set frequency limiting operation time, if the PWM output saturation is not determined to occur, exiting the frequency limiting mode and controlling the compressor to operate at the set rotating speed.
In order to achieve the above object, the present invention provides a compressor driving control device, which is implemented by the following technical solutions:
a compressor drive control apparatus, characterized by comprising:
the three-phase voltage output instruction acquisition unit is used for acquiring a three-phase voltage output instruction obtained by vector calculation in a compressor driving system when the compressor operates;
the PWM output saturation determining unit is used for determining whether PWM output saturation occurs according to the three-phase voltage output instruction;
the rotating speed control unit is used for controlling the compressor to operate at a set rotating speed under the condition that PWM output saturation does not occur, and is also used for entering a frequency limiting mode and controlling the compressor to operate at an actual rotating speed under the frequency limiting mode under the condition that the PWM output saturation occurs; and the actual rotating speed in the frequency limiting mode is less than the set rotating speed.
In the above compressor drive control device, the PWM output saturation determining unit determines whether PWM output saturation occurs according to the three-phase voltage output command, and specifically includes:
normalizing each phase voltage output instruction in the three-phase voltage output instructions according to the direct-current bus voltage to obtain three normalized phase voltage outputs;
comparing each of said normalized phase voltage outputs to a known maximum output voltage;
if the phase voltage after the normalization processing is larger than the maximum output voltage, determining that the phase voltage overflows;
and if at least one phase voltage subjected to normalization processing continuously overflows for a set number of times, determining that PWM output saturation occurs.
In the above compressor drive control device, the rotation speed control unit enters the frequency limiting mode when the PWM output saturation occurs, and controls the compressor to operate at the actual rotation speed in the frequency limiting mode, which specifically includes:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)];
Vdc1for a known rated DC bus voltage, VpIs a known bias voltage.
The compressor driving control device is characterized in that the rotating speed control unit is further used for comparing the actual rotating speed w with the known lowest rotating speed of the compressor after determining the actual rotating speed w in the frequency limiting mode; if the actual rotating speed w is less than the lowest rotating speed, updating the lowest rotating speed by using the actual rotating speed w;
the rotary shaftThe speed control unit is also used for detecting the current direct current bus voltage Vdc0Greater than the rated DC bus voltage Vdc1In time, the current DC bus voltage V is enableddc0For said rated DC bus voltage Vdc1And then calculating the actual rotating speed w in the frequency limiting mode.
Compared with the prior art, the invention has the advantages and positive effects that: the invention provides a compressor drive control method and device, which firstly judge whether PWM output saturation occurs according to a three-phase voltage output instruction obtained by vector calculation in a compressor drive control system, when the PWM output saturation occurs, the frequency limiting mode is entered, and the compressor is controlled to operate at an actual rotating speed in the frequency limiting mode which is less than a set rotating speed, therefore, under the condition of PWM output saturation, the compressor is forced to operate at a lower rotating speed, and the probability of PWM output saturation is reduced by reducing the system load, so that the problem that the normal use is influenced because the compressor stops operating due to PWM output saturation is effectively avoided. Moreover, the invention judges whether the PWWM output saturation occurs according to the three-phase voltage output instruction obtained by the vector calculation in the compressor drive control system, and the three-phase voltage output instruction obtained by the vector calculation judges the U, V, W three-phase voltage output after the conversion from the dq axis coordinate system to the UVW coordinate system in the drive control system is output saturation, thereby improving the accuracy of the judgment of the PWM output saturation and further improving the accuracy of the compressor drive control.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of one embodiment of a compressor drive control method according to the present invention;
fig. 2 is a flowchart of another embodiment of a compressor drive control method according to the present invention;
fig. 3 is a block diagram illustrating a structure of one embodiment of a compressor driving control apparatus according to the present invention;
FIG. 4 is a partial control block diagram of a compressor drive control system;
fig. 5 is a PWM output saturation graph.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a flowchart illustrating a compressor driving control method according to an embodiment of the present invention. As shown in fig. 1, in order to solve the problem of the compressor shutdown caused by the saturation of the PWM output in the compressor driving system, the compressor driving control is implemented by a process including the following steps.
Step 101: and when the compressor runs, acquiring a three-phase voltage output instruction acquired by vector calculation in the compressor drive control system.
Referring to a partial control block diagram of the compressor drive control system shown in fig. 4, the three-phase voltage output command obtained by vector calculation is U, V, W three-phase voltage output after inverse Clark conversion, and is U, V, W three-phase voltage output after conversion from a dq axis coordinate system to a UVW coordinate system is completed in the drive control system.
Step 102: and judging whether PWM output saturation occurs or not. If yes, go to step 104; if not, go to step 103.
In this step, whether PWM output saturation occurs is determined according to the three-phase voltage output command.
Determining whether PWM output saturation occurs according to a three-phase voltage output instruction, and specifically comprising the following steps:
and respectively carrying out normalization processing on each phase voltage output instruction in the three-phase voltage output instructions according to the voltage of the direct current bus to obtain three phase voltage outputs after normalization processing. The process is performed to convert the voltage output command of each phase into data that can be recognized by the chip, facilitating the process of output saturation.
Each normalized phase voltage output is compared to a known maximum output voltage. The maximum output voltage is a predetermined voltage value, and is generally determined according to parameters of the frequency conversion hardware circuit components or according to actual conditions of testing when the maximum output voltage is determined.
And if the phase voltage after the normalization processing is larger than the maximum output voltage, determining that the phase voltage overflows.
And if at least one phase voltage subjected to normalization processing continuously overflows for a set number of times, determining that PWM output saturation occurs. The setting times can be set to 3 times or 4 times to reduce misjudgment. In general, the three-phase voltage output command is detected once in one carrier cycle, and a phase voltage overflow is determined once. The carrier period is set by the inverter in the compressor drive system.
Because the three-phase voltage output instruction is U, V, W three-phase voltage output after the conversion from the dq axis coordinate system to the UVW coordinate system is completed in the drive control system, the method is adopted to judge the output saturation of the three-phase voltage, and the accuracy of judging the PWM output saturation can be improved. And, as long as the phase voltage of one phase continuously overflows and reaches the set number of times, the PWM output saturation is judged to occur.
In some other preferred embodiments, normalizing each phase voltage output instruction in the three-phase voltage output instructions according to the dc bus voltage to obtain three normalized phase voltage outputs, specifically including:
setting each phase voltage output command as Vo, the direct current bus voltage as Vdc and the normalized phase voltage as Vout, and determining Vout by adopting the following method:
Figure 113003DEST_PATH_IMAGE002
。
the graph of the PWM output at saturation obtained by the above method is shown in fig. 5.
Step 103: and if the PWM output saturation is not determined to occur, controlling the compressor to operate at the set rotating speed. The set rotating speed is a rotating speed instruction transmitted by the upper computer and is a rotating speed instruction input in the normal driving control of the compressor.
Step 104: and if the PWM output saturation is determined to occur, entering a frequency limiting mode, and controlling the compressor to operate at the actual rotating speed in the frequency limiting mode. Wherein, the actual rotation speed in the frequency limiting mode is less than the set rotation speed in step 103.
By adopting the method of the embodiment, when the three-phase voltage output instruction obtained based on the vector calculation judges that the PWM output saturation occurs, the compressor is forced to operate at a lower rotating speed, and the system load is reduced, so that the PWM output saturation probability is reduced, and the problem that the normal use is influenced because the compressor stops operating due to the PWM output saturation is effectively avoided.
The specific determination of the actual rotation speed in the limited frequency mode can be implemented in various ways, for example, by a rotation speed value whose difference from the set rotation speed is a fixed value. In other preferred embodiments, the actual speed in the frequency limited mode is determined based on the current compressor speed and the dc bus voltage. The specific determination method comprises the following steps:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)]。
the current compressor rotating speed can be obtained through a Hall sensor or a sensorless vector control algorithm, and the current direct-current bus voltage can be obtained in real time through AD detection; vdc1Is a known rated dc bus voltage, which can be generally determined by the power supply; vpThe known bias voltage is used for representing the fluctuation range of the direct current bus voltage and can be determined according to the power supply and the actual condition.
Fig. 2 is a flowchart illustrating another embodiment of a compressor driving control method according to the present invention. As shown in fig. 2, in order to solve the problem of the compressor shutdown caused by the saturation of the PWM output in the compressor driving system, the compressor driving control is implemented by a process including the following steps.
Step 201: and when the compressor runs, acquiring a three-phase voltage output instruction acquired by vector calculation in the compressor drive control system.
Referring to a partial control block diagram of the compressor drive control system shown in fig. 4, the three-phase voltage output command obtained by vector calculation is U, V, W three-phase voltage output after inverse Clark conversion, and is U, V, W three-phase voltage output after conversion from a dq axis coordinate system to a UVW coordinate system is completed in the drive control system.
Step 202: and judging whether PWM output saturation occurs or not. If yes, go to step 204; if not, go to step 203. The specific judgment method refers to the description of the embodiment of fig. 1.
Step 203: and if the PWM output saturation is not determined to occur, controlling the compressor to operate at the set rotating speed. The set rotating speed is a rotating speed instruction transmitted by the upper computer and is a rotating speed instruction input in the normal driving control of the compressor.
Step 204: and if the PWM output saturation is determined to occur, entering a frequency limiting mode, and determining the actual rotating speed in the frequency limiting mode.
In a preferred embodiment, the actual speed in the frequency limited mode is determined based on the current compressor speed and the dc bus voltage. The specific determination method comprises the following steps:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)]。
the current compressor rotating speed can be obtained through a Hall sensor or a sensorless vector control algorithm, and the current direct-current bus voltage can be obtained in real time through AD detection; vdc1Is known asThe nominal dc bus voltage, which can be generally determined by the power supply; vpThe known bias voltage is used for representing the fluctuation range of the direct current bus voltage and can be determined according to the power supply and the actual condition.
Step 205: a decision is made as to whether the actual speed determined in step 204 is valid. If yes, go to step 207; if not, the rotational speed validation process of step 206 is performed.
In this step, it is determined whether the actual rotation speed is valid, specifically, it is determined whether the value of the actual rotation speed is within a valid range, and if so, the actual rotation speed is considered to be valid, otherwise, the actual rotation speed is considered to be invalid. Specifically, after the actual rotating speed w in the frequency limiting mode is determined, the actual rotating speed w is compared with the known lowest rotating speed of the compressor, and the detected current direct current bus voltage V is detecteddc0And rated DC bus voltage Vdc1For comparison. If the actual rotating speed w is not less than the lowest rotating speed of the compressor and the current direct current bus voltage Vdc0Not greater than rated DC bus voltage Vdc1Judging that the actual rotating speed is effective; otherwise, it is determined that the actual rotation speed is invalid.
Step 206: and if the actual rotating speed is judged to be invalid, executing rotating speed valid processing. Then, go to step 207.
The rotating speed effective processing process comprises the following steps: and if the actual rotating speed w is less than the lowest rotating speed, updating the lowest rotating speed by using the actual rotating speed w. If the detected current DC bus voltage Vdc0Greater than the rated DC bus voltage Vdc1If calculated directly, then there will be w greater than w0So that the current DC bus voltage V is programmeddc0Is rated DC bus voltage Vdc1And then calculating the actual rotating speed w in the frequency limiting mode.
Step 207: after the actual rotation speed is the effective rotation speed or the actual rotation speed is subjected to the rotation speed effective processing in the step 206, the compressor is controlled to operate at the actual rotation speed in the frequency limiting mode, and the timing is started from the entering of the frequency limiting mode.
Step 208: and judging whether the timing time is up. If not, the frequency limiting mode of step 207 is executed continuously. If the timing time is up, go to step 202 to continuously determine whether PWM output saturation occurs. If no PWM output saturation occurs, the frequency limiting mode is exited, and the compressor is controlled to operate at the set rotating speed. The timing time is preset time and is used for limiting the operation time of the frequency limiting mode and avoiding the influence of long-time operation of the frequency limiting mode on the normal control of the compressor.
By adopting the method of the embodiment, when the three-phase voltage output instruction obtained based on the vector calculation judges that the PWM output saturation occurs, the compressor is forced to operate at a lower rotating speed, and the system load is reduced, so that the PWM output saturation probability is reduced, and the problem that the normal use is influenced because the compressor stops operating due to the PWM output saturation is effectively avoided. And the performance influence on the integral drive control of the compressor is effectively avoided through the effective judgment of the actual rotating speed, the effective processing of the rotating speed and the limitation of the operating time of the frequency limiting mode.
Fig. 3 is a block diagram showing the structure of one embodiment of the compressor driving control apparatus according to the present invention. The compressor drive control device of the embodiment includes the following structural units, and the functions and mutual connection relations of the structural units are as follows:
and the three-phase voltage output instruction acquisition unit 31 is used for acquiring a three-phase voltage output instruction obtained by vector calculation in the compressor driving system when the compressor operates.
And a PWM output saturation determining unit 32 for determining whether PWM output saturation occurs according to the three-phase voltage output instruction output by the three-phase voltage output instruction obtaining unit 31. The specific determination method of PWM output saturation is described with reference to the method embodiments of fig. 1 and 2.
And a rotation speed control unit 33 for controlling the compressor to operate at the set rotation speed when the PWM output saturation does not occur, and for entering a frequency limiting mode and controlling the compressor to operate at the actual rotation speed in the frequency limiting mode when the PWM output saturation occurs. Moreover, the actual rotation speed in the frequency-limited mode is less than the set rotation speed. The more specific control process of the speed control unit is also described with reference to the method embodiments of fig. 1 and 2.
The compressor driving control device with the above structure, in combination with the compressor driving control system, runs the corresponding software program, and performs the compressor driving control according to the process of the method embodiment of fig. 1 and 2, thereby producing the same technical effect as the method embodiment.
The compressor driving control method and device described in the above embodiments and preferred embodiments can be applied to an inverter air conditioner, especially an inverter air conditioner without an electrolytic capacitor, to control an air conditioner compressor.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A compressor drive control method, characterized by comprising:
when the compressor runs, acquiring a three-phase voltage output instruction acquired by vector calculation in a compressor drive control system;
determining whether PWM output saturation occurs according to the three-phase voltage output instruction;
if no PWM output saturation occurs, controlling the compressor to operate at a set rotating speed;
if PWM output is saturated, entering a frequency limiting mode, and controlling the compressor to operate at the actual rotating speed in the frequency limiting mode; and the actual rotating speed in the frequency limiting mode is less than the set rotating speed.
2. The compressor drive control method according to claim 1, wherein determining whether PWM output saturation occurs according to the three-phase voltage output command specifically includes:
normalizing each phase voltage output instruction in the three-phase voltage output instructions according to the direct-current bus voltage to obtain three normalized phase voltage outputs;
comparing each of said normalized phase voltage outputs to a known maximum output voltage;
if the phase voltage after the normalization processing is larger than the maximum output voltage, determining that the phase voltage overflows;
and if at least one phase voltage subjected to normalization processing continuously overflows for a set number of times, determining that PWM output saturation occurs.
3. The compressor driving control method according to claim 2, wherein each phase voltage output command in the three-phase voltage output commands is normalized according to the dc bus voltage to obtain three normalized phase voltage outputs, specifically comprising:
setting each phase voltage output command as Vo, the direct current bus voltage as Vdc and the normalized phase voltage as Vout, and determining Vout by adopting the following method:
Figure DEST_PATH_IMAGE002
。
4. the compressor drive control method according to any one of claims 1 to 3, characterized by further comprising:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)];
Vdc1for a known rated DC bus voltage, VpIs a known bias voltage.
5. The compressor drive control method according to claim 4, characterized by further comprising:
after the actual rotating speed w in the frequency limiting mode is determined, comparing the actual rotating speed w with the known lowest rotating speed of the compressor;
if the actual rotating speed w is less than the lowest rotating speed, updating the lowest rotating speed by using the actual rotating speed w;
the method further comprises the following steps:
if the current DC bus voltage V is detecteddc0Greater than the rated DC bus voltage Vdc1Then, the current DC bus voltage V is enableddc0For said rated DC bus voltage Vdc1And then calculating the actual rotating speed w in the frequency limiting mode.
6. The compressor drive control method according to claim 1, characterized by further comprising:
and starting timing from entering the frequency limiting mode, and after the timing time reaches the set frequency limiting operation time, if the PWM output saturation is not determined to occur, exiting the frequency limiting mode and controlling the compressor to operate at the set rotating speed.
7. A compressor drive control apparatus, characterized by comprising:
the three-phase voltage output instruction acquisition unit is used for acquiring a three-phase voltage output instruction obtained by vector calculation in a compressor driving system when the compressor operates;
the PWM output saturation determining unit is used for determining whether PWM output saturation occurs according to the three-phase voltage output instruction;
the rotating speed control unit is used for controlling the compressor to operate at a set rotating speed under the condition that PWM output saturation does not occur, and is also used for entering a frequency limiting mode and controlling the compressor to operate at an actual rotating speed under the frequency limiting mode under the condition that the PWM output saturation occurs; and the actual rotating speed in the frequency limiting mode is less than the set rotating speed.
8. The compressor drive control device according to claim 7, wherein the PWM output saturation determination unit determines whether PWM output saturation occurs according to the three-phase voltage output command, and specifically includes:
normalizing each phase voltage output instruction in the three-phase voltage output instructions according to the direct-current bus voltage to obtain three normalized phase voltage outputs;
comparing each of said normalized phase voltage outputs to a known maximum output voltage;
if the phase voltage after the normalization processing is larger than the maximum output voltage, determining that the phase voltage overflows;
and if at least one phase voltage subjected to normalization processing continuously overflows for a set number of times, determining that PWM output saturation occurs.
9. The compressor driving control device according to claim 7 or 8, wherein the rotation speed control unit enters a frequency limiting mode when the PWM output saturation occurs, and controls the compressor to operate at an actual rotation speed in the frequency limiting mode, specifically comprising:
if the PWM output saturation is determined to occur, the current compressor rotating speed w when the PWM output saturation occurs is obtained0And the current DC bus voltage Vdc0Based on the current compressor speed w0And the current DC bus voltage Vdc0The actual rotation speed w in the frequency-limited mode is determined by the following method:
w= w0*[ Vdc0/ (Vdc1+Vp)];
Vdc1for a known rated DC bus voltage, VpIs a known bias voltage.
10. The compressor drive control device according to claim 9, wherein the rotation speed control unit is further configured to compare the actual rotation speed w with a known minimum rotation speed of the compressor after determining the actual rotation speed w in the frequency limited mode; if the actual rotating speed w is less than the lowest rotating speed, updating the lowest rotating speed by using the actual rotating speed w;
the rotating speed control unit is also used for detecting the current direct current bus voltage Vdc0Greater than the rated DC bus voltage Vdc1In time, the current DC bus voltage V is enableddc0For said rated DC bus voltage Vdc1And then calculating the actual rotating speed w in the frequency limiting mode.
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CN110492822A (en) * 2019-08-22 2019-11-22 青岛海尔空调电子有限公司 Transducer air conditioning and its weak magnetic control limitation voltage setting method and control method

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JP2012065463A (en) * 2010-09-16 2012-03-29 Fuji Electric Co Ltd Drive controller and drive control method for inverter hoist
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