CN107707165B - Control method of compressor, compressor system and refrigeration equipment - Google Patents
Control method of compressor, compressor system and refrigeration equipment Download PDFInfo
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- CN107707165B CN107707165B CN201710932252.1A CN201710932252A CN107707165B CN 107707165 B CN107707165 B CN 107707165B CN 201710932252 A CN201710932252 A CN 201710932252A CN 107707165 B CN107707165 B CN 107707165B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
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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
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Abstract
The invention discloses a control method of a compressor, a compressor system and refrigeration equipment, wherein the control method of the compressor comprises the following steps: acquiring a preset reference voltage when the compressor runs at a preset weak magnetic depth coefficient and a preset mechanical rotating speed; acquiring the current direct current bus voltage; when the preset reference voltage is larger than the current direct-current bus voltage, the flux weakening depth coefficient is increased to the maximum preset flux weakening depth coefficient, and then the mechanical rotating speed is reduced until the current reference voltage when the compressor operates at the current flux weakening depth coefficient and the current mechanical rotating speed is not larger than the current direct-current bus voltage; and controlling the compressor to operate at the current flux weakening depth coefficient and the current mechanical rotating speed. The technical scheme of the invention has the characteristic of high efficiency.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a compressor control method, a compressor system and refrigeration equipment.
Background
The control method of the existing compressor is as follows: firstly, detecting the voltage of a direct current bus; and then, controlling the compressor according to the detected direct current bus voltage. Specifically, the field weakening depth coefficient of a motor in the compressor is continuously increased according to the direct current bus voltage, so that the compressor can stably operate.
The weak magnetic depth coefficient represents the ratio of a direct-axis reverse flux linkage generated by weak magnetic current in the motor to a permanent magnet flux linkage, and the larger the weak magnetic depth coefficient is, the lower the efficiency of the corresponding compressor is.
The control method of the compressor continuously increases the flux weakening depth coefficient in the compressor according to the direct current bus voltage, and the larger the flux weakening depth coefficient is, the lower the efficiency of the corresponding compressor is, therefore, the existing control method of the compressor has the defect of low efficiency.
Disclosure of Invention
The invention mainly aims to provide a control method of a compressor, aiming at improving the efficiency of the compressor.
In order to achieve the above object, the present invention provides a method for controlling a compressor, comprising the steps of:
s10, acquiring a preset reference voltage when the compressor runs at a preset weak magnetic depth coefficient and a preset mechanical rotating speed;
s20, acquiring the current direct current bus voltage;
s30, when the preset reference voltage is larger than the current direct current bus voltage, increasing the flux weakening depth coefficient to the maximum preset flux weakening depth coefficient, and then reducing the mechanical rotation speed until the current reference voltage when the compressor operates at the current flux weakening depth coefficient and the current mechanical rotation speed is not larger than the current direct current bus voltage;
and S40, controlling the compressor to operate at the current flux weakening depth coefficient and the current mechanical speed.
Preferably, the step S10 specifically includes:
s11, defining a reference voltage, and establishing a mapping relation among the reference voltage, a weak magnetic depth coefficient of the compressor and the mechanical rotating speed of the compressor;
and S12, calculating the preset weak magnetic depth and the preset reference voltage under the condition of the preset mechanical rotating speed according to the mapping relation.
Preferably, the step S30 specifically includes:
s31, judging whether the preset reference voltage is less than or equal to the current direct current bus voltage;
if yes, executing step S32, and controlling the compressor to operate at the preset weak magnetic depth coefficient and the preset mechanical rotation speed;
if not, executing step S33, increasing the weak magnetic depth coefficient, and calculating the current weak magnetic depth coefficient and the first reference voltage under the preset mechanical rotation speed condition;
s34, judging whether the first reference voltage is less than or equal to the current direct current bus voltage
If yes, executing step S35, and controlling the compressor to operate at the current flux weakening depth coefficient and the preset mechanical rotation speed;
if not, executing step S36, and judging whether the current weak magnetic depth coefficient is less than or equal to the maximum preset weak magnetic depth coefficient;
if yes, go to step S33;
if not, executing the step S37, reducing the mechanical rotating speed, and calculating a maximum preset weak magnetic depth coefficient and a second reference voltage under the current mechanical rotating speed condition;
s38, judging whether the second reference voltage is less than or equal to the current direct current bus voltage;
if yes, executing step S39, and controlling the compressor to operate at the maximum preset weak magnetic depth coefficient and the current mechanical rotating speed;
if not, jumping to the step S37 until the second reference voltage is less than or equal to the current dc bus voltage.
Preferably, the step S33 is preceded by:
s331, judging whether a power supply circuit of the compressor has a boosting function;
if yes, executing step S332 to start the boost function of the power supply circuit to boost the dc bus voltage;
if not, the step S33 is executed.
Preferably, the step S332 is followed by:
s333, judging whether the preset reference voltage is smaller than or equal to the boosted direct-current bus voltage;
if yes, go to step S32;
if not, the boosted dc bus voltage is used as the current dc bus voltage, and the process goes to step S33.
Preferably, the step S332 is followed by:
s333, judging whether the preset reference voltage is smaller than or equal to the boosted direct-current bus voltage;
if yes, go to step S32;
if not, the boosted dc bus voltage is used as the current dc bus voltage, and the process skips to the step S331.
Correspondingly, the invention also provides a compressor system, which comprises a compressor, a memory, a processor and a control program of the compressor, wherein the control program of the compressor is stored in the memory and can run in the processor; the control program of the compressor, when executed by the processor, implements the steps of the control method of the compressor as described above.
Preferably, the memory and the processor are integrated in a control chip, the compressor system further includes a power supply circuit for providing a working voltage for the compressor, the power supply circuit includes an electrolytic capacitor and a power output unit, a power output terminal of the electrolytic capacitor is connected to a power input terminal of the power output unit, the power output terminal of the power output unit, the power input terminal of the compressor and a power current sampling terminal of the control chip are interconnected, and a control terminal of the control chip is connected to a controlled terminal of the power output unit.
Preferably, the power supply circuit further includes a boosting unit, and a power supply output terminal of the boosting unit is connected to a power supply input terminal of the electrolytic capacitor.
The invention also proposes a refrigeration plant comprising a compressor system as described above; the compressor system comprises a compressor, a memory, a processor and a control program of the compressor, wherein the control program of the compressor is stored in the memory and can run in the processor; the control program of the compressor, when executed by the processor, implements the steps of the control method of the compressor as described above.
The control method of the compressor comprises the following steps: and when the preset reference voltage is higher than the current direct-current bus voltage, increasing the flux weakening depth coefficient to the maximum preset flux weakening depth coefficient, and then reducing the mechanical rotating speed until the current reference voltage when the compressor operates at the current flux weakening depth coefficient and the current mechanical rotating speed is lower than the current direct-current bus voltage. Because in this technical scheme, the weak magnetic depth coefficient increases to the maximum and presets just not increase behind the weak magnetic depth coefficient to make the efficiency of compressor obtain guaranteeing, consequently, compared with prior art, this technical scheme efficiency is higher.
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating an embodiment of a method for controlling a compressor according to the present invention;
FIG. 2 is a schematic flow chart illustrating another embodiment of a method for controlling a compressor according to the present invention;
FIG. 3 is a schematic flow chart illustrating a method for controlling a compressor according to another embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an embodiment of a compressor system of the present invention;
fig. 5 is a schematic structural view of another embodiment of the compressor system of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the descriptions relating to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The permanent magnet synchronous motor has the advantages of good control performance, high power density, energy conservation and the like, and is more and more widely applied to various industries. In refrigeration equipment such as air conditioners, compressors based on permanent magnet synchronous motors have become the mainstream.
For a permanent magnet synchronous machine, in the state voltage without entering flux-weakening operation, the phase voltage is mainly formed by the back electromotive force generated by the permanent magnet, specifically:
phase voltage is equal to the mechanical rotating speed of the compressor, multiplied by pole logarithm and multiplied by opposite potential coefficients; (1)
the phase voltage refers to a phase voltage peak value of the compressor, the opposite potential coefficient refers to an interphase induction voltage peak value of the compressor when the mechanical rotating speed of the compressor is 1rad/s, and when parameters of the compressor are determined, the pole pair number and the opposite potential coefficient are also determined.
Under the state of entering weak magnetic operation, a part of the permanent magnet flux linkage is counteracted by the direct-axis reverse current, so that the phase voltage of the permanent magnet synchronous motor is as follows:
mechanical rotation speed of the compressor, pole pair number, opposite potential coefficient x (1-weak magnetic depth coefficient); (2)
the weak magnetic depth coefficient represents the ratio of a direct-axis reverse flux linkage generated by weak magnetic current to a permanent magnet flux linkage, the larger the weak magnetic depth coefficient is, the larger the weak magnetic current is, the deeper the weak magnetic is, the weak magnetic depth coefficient cannot exceed 1, and otherwise, the motor is completely demagnetized. The larger the flux weakening depth coefficient is, the lower the motor efficiency is, and the more energy is saved; in the application of the variable frequency air conditioner, the value range of the weak magnetic depth coefficient is [0,0.5 ].
In a control system of a permanent magnet synchronous motor, the maximum phase voltage that can be output is limited by the dc bus voltage, i.e.
The maximum output phase voltage is less than or equal to the voltage of the direct current bus multiplied by K multiplied by the voltage utilization rate; (3)
the voltage utilization rate is the utilization rate of the direct current bus voltage in electric control, is influenced by a modulation algorithm, dead time and the like, and is generally in the range of 0.8-1.157.
By combining the above (1), (2) and (3):
phase voltage (V) is equal to or less than the maximum output phase voltage which is equal to or less than the direct current bus voltage which is equal to or less than K and is equal to the voltage utilization rate of the compressor mechanical rotating speed, pole pair number and opposite potential coefficient (x) (1-flux weakening depth coefficient); (4)
the formula (4) is simplified to obtain:
the mechanical rotating speed is less than or equal to the direct current bus voltage (1-weak magnetic depth coefficient) multiplied by the pole pair number multiplied by the opposite potential coefficient/(Kmultiplied by the voltage utilization rate); (5)
the above equation (5) shows that, under the condition that the voltage utilization rate and the compressor parameters are determined in the electric control, the direct current bus voltage directly influences the maximum output phase voltage, and then influences the mechanical rotating speed and/or the weak magnetic depth coefficient of the compressor. When the voltage of the direct current bus is lower, the mechanical rotating speed of the compressor is reduced or the weak magnetic depth coefficient is increased; and vice versa.
Based on the above description, the present invention proposes a control method of a compressor.
Referring to fig. 1, in an embodiment, the method for controlling a compressor includes the following steps:
s10, acquiring a preset reference voltage when the compressor runs at a preset weak magnetic depth coefficient and a preset mechanical rotating speed;
here, the preset weak magnetic depth coefficient refers to a weak magnetic depth coefficient when the compressor is about to operate; the preset mechanical rotation speed refers to a mechanical rotation speed at which the compressor is to operate. Generally, in order to make the compressor have higher efficiency, the preset field weakening depth coefficient should be as small as possible and the preset mechanical rotation speed should be as large as possible. Since the preferable range of the preset weak magnetic depth coefficient is [0,1 ], it is preferable that the preset weak magnetic depth coefficient is zero.
It is worth mentioning that, in the operation process of the compressor, the parameter of the weak magnetic depth coefficient has a larger influence on the efficiency of the compressor than the mechanical rotating speed.
Referring to fig. 2 and 3, in an embodiment, the preset reference voltage of the compressor running at the preset flux weakening depth coefficient and the preset mechanical rotation speed may be obtained as follows:
s11, defining a reference voltage, and establishing a mapping relation among the reference voltage, a weak magnetic depth coefficient of the compressor and the mechanical rotating speed of the compressor;
based on the above description about the permanent magnet synchronous motor, in the present embodiment, the mapping relationship between the reference voltage and the weak magnetic depth coefficient and the mechanical rotation speed of the compressor may be selected as follows:
the reference voltage is the mechanical rotating speed of the compressor, the number of pole pairs of the compressor and the opposite potential coefficient of the compressor, x (1-weak magnetic depth coefficient of the compressor), and/or (K multiplied by the voltage utilization rate of a direct current bus); wherein K is approximately equal to 0.577. (6)
It can be understood that when the compressor parameter is fixed, the number of the pole pairs of the compressor and the counter potential coefficient of the compressor are also fixed, and the direct current bus voltage utilization rate and the parameter K are also basically fixed values. Therefore, the reference voltage is a binary function with the mechanical rotation speed of the compressor and the weak magnetic depth coefficient as independent variables. When the mechanical rotation speed of the compressor is fixed, the larger the weak magnetic depth coefficient is, the smaller the reference voltage is; when the flux weakening depth coefficient of the compressor is fixed, the larger the mechanical rotating speed is, the larger the reference voltage is.
And S12, calculating the preset weak magnetic depth and the preset reference voltage under the condition of the preset mechanical rotating speed according to the mapping relation.
And substituting the numerical values corresponding to the preset weak magnetic depth coefficient and the preset mechanical rotating speed into the formula (6) to obtain the preset reference voltage under the conditions of the preset weak magnetic depth and the preset mechanical rotating speed.
S20, acquiring the current direct current bus voltage;
in this embodiment, the current dc bus voltage in the compressor system can be directly detected by the voltage detection device.
S30, when the preset reference voltage is larger than the current direct current bus voltage, increasing the flux weakening depth coefficient to the maximum preset flux weakening depth coefficient, and then reducing the mechanical rotation speed until the current reference voltage when the compressor operates at the current flux weakening depth coefficient and the current mechanical rotation speed is not larger than the current direct current bus voltage;
in this embodiment, when it is known that the preset reference voltage is greater than the current dc bus voltage, the weak magnetic depth coefficient is first increased, and when the weak magnetic depth coefficient is increased to the maximum preset weak magnetic depth coefficient:
if the maximum preset weak magnetic depth coefficient and the current reference voltage under the condition of the preset mechanical rotating speed are lower than the current direct current bus voltage, the mechanical rotating speed does not need to be reduced; if the maximum preset weak magnetic depth coefficient and the current reference voltage under the preset mechanical rotation speed condition are still larger than the current direct current bus voltage, the mechanical rotation speed needs to be reduced again until the maximum preset weak magnetic depth coefficient and the current reference voltage under the current mechanical rotation speed condition are smaller than or equal to the current direct current bus voltage.
In order to control the operation of the compressor more rapidly, the flux weakening depth coefficient can be increased to the maximum preset flux weakening depth coefficient at one time. In order to make the compressor have higher efficiency, the flux weakening depth coefficient can be gradually increased to the maximum preset flux weakening depth coefficient, and the current flux weakening depth coefficient and the current reference voltage under the condition of the preset mechanical rotating speed need to be correspondingly calculated every time the flux weakening depth coefficient is increased.
It is understood that, in the step S30, the current flux weakening depth coefficient includes all flux weakening depth coefficient values from the preset flux weakening depth coefficient to the maximum preset flux weakening depth coefficient; and the current mechanical rotating speed comprises all mechanical rotating speed values between the preset mechanical rotating speed and any adjusted mechanical rotating speed.
In this embodiment, the d-axis current of the motor in the compressor can be increased according to the vector control structure diagram of the motor, so as to increase the flux weakening depth coefficient of the compressor. And reducing the given angular frequency of the motor according to the vector control structure diagram of the motor in the compressor, thereby reducing the mechanical rotating speed of the compressor.
Referring to fig. 2, in an embodiment, the step S30 specifically includes:
s31, judging whether the preset reference voltage is less than or equal to the current direct current bus voltage;
after the preset reference voltage and the current direct current bus voltage are obtained, comparing a voltage value corresponding to the preset reference voltage with a voltage value corresponding to the current direct current bus voltage to judge whether the preset reference voltage is smaller than or equal to the current direct current bus voltage.
Here, making the comparison may include making a difference comparison and making a quotient comparison.
If the comparison result shows that the preset reference voltage is less than or equal to the current direct current bus voltage, the compressor is feasible to operate at the preset weak magnetic depth coefficient and the preset mechanical rotating speed, and the operation conforms to the formula (4). At this time, step S32 may be executed to control the compressor to operate at the preset flux weakening depth coefficient and the preset mechanical rotation speed; to allow more efficient operation of the compressor.
If the comparison result shows that the preset reference voltage is greater than the current direct current bus voltage, the condition that the compressor is not feasible to operate at the preset weak magnetic depth coefficient and the preset mechanical rotating speed is indicated, and the preset weak magnetic depth coefficient and the preset mechanical rotating speed do not accord with the above formula (4).
In an embodiment, step S33 may be executed to increase the flux weakening depth coefficient, and calculate the current flux weakening depth coefficient and the first reference voltage under the preset mechanical rotation speed condition. And executing step S34 to determine whether the first reference voltage is less than or equal to the current dc bus voltage.
If the first reference voltage is less than or equal to the current direct current bus voltage, executing a step S35, and controlling the compressor to operate at the current flux weakening depth coefficient and the preset mechanical rotation speed; if the first reference voltage is greater than the current dc bus voltage, step S36 is executed to determine whether the current flux weakening depth coefficient is less than or equal to the maximum preset flux weakening depth coefficient.
If the current flux weakening depth coefficient is less than or equal to the maximum flux weakening depth coefficient, jumping to the step S33; if the current flux weakening depth coefficient is larger than the maximum flux weakening depth coefficient, executing a step S37, reducing the mechanical rotating speed, and calculating a maximum preset flux weakening depth coefficient and a second reference voltage under the current mechanical rotating speed condition; and executing step S38 to determine whether the second reference voltage is less than or equal to the current dc bus voltage.
If the second reference voltage is less than or equal to the current direct current bus voltage, executing step S39, and controlling the compressor to operate at the maximum preset weak magnetic depth coefficient and the current mechanical rotating speed; if the second reference voltage is greater than the current dc bus voltage, go to step S37 above until the second reference voltage is less than or equal to the current dc bus voltage.
In another embodiment, before performing step S33, the method further includes:
step S331, judging whether a power supply circuit of the compressor has a boosting function;
if the direct current bus voltage has the boosting function, executing step S332, and starting the boosting function of the power supply circuit to boost the direct current bus voltage; if there is no boosting function, the step S33 is executed.
It can be understood that the reasonable value range of the reference voltage can be expanded by increasing the voltage of the direct current bus, so that the compressor can obtain higher efficiency conveniently.
In another embodiment, after the step S332 is executed, the method further includes:
step S333, judging whether the preset reference voltage is less than or equal to the boosted direct-current bus voltage;
if the preset reference voltage is less than or equal to the boosted direct-current bus voltage, jumping to the step S32; and if the preset reference voltage is greater than the boosted direct-current bus voltage, taking the boosted direct-current bus voltage as the current direct-current bus voltage, and jumping to the step S33.
It will be appreciated that the present embodiment is capable of accommodating compressor power supply circuits with a smaller boost range.
In another embodiment, after the step S332 is executed, the method further includes:
step S333, judging whether the preset reference voltage is less than or equal to the boosted direct-current bus voltage;
if the preset reference voltage is less than or equal to the boosted direct-current bus voltage, jumping to the step S32; and if the preset reference voltage is greater than the boosted direct-current bus voltage, taking the boosted direct-current bus voltage as the current direct-current bus voltage, and skipping to the step S331.
It can be understood that the dc bus voltage in this embodiment is gradually increased, thereby facilitating efficient operation of the compressor. In addition, the present embodiment can accommodate a compressor power supply circuit with a small boost range.
And S40, controlling the compressor to operate at the current flux weakening depth coefficient and the current mechanical speed.
Here, the current weak magnetic depth coefficient includes all weak magnetic depth coefficient values between the preset weak magnetic depth coefficient and the maximum preset weak magnetic depth coefficient; and the current mechanical rotating speed comprises all mechanical rotating speed values between the preset mechanical rotating speed and any adjusted mechanical rotating speed.
Correspondingly, the invention also provides a compressor 200 system, which comprises a compressor 200, a memory, a processor and a control program of the compressor 200, wherein the control program is stored in the memory and can be operated in the processor; the control program of the compressor 200, when executed by the processor, implements the steps of the control method of the compressor 200 as described above.
Here, the memory and the processor may be two separate functional hardware, or may be integrated in the control chip, which is not limited herein.
Preferably, referring to fig. 4, in an embodiment of the control system of the compressor 200 of the present invention, the memory and the processor are integrated in a control chip, the compressor 200 system further includes a power supply circuit for providing a working voltage for the compressor 200, the power supply circuit includes an electrolytic capacitor C1 and a power output unit 100, a power output terminal of the electrolytic capacitor C1 is connected to a power input terminal of the power output unit 100, the power output terminal of the power output unit 100, a power input terminal of the compressor 200 and a power current sampling terminal of the control chip are interconnected, and a control terminal of the control chip is connected to a controlled terminal of the power output unit 100.
Here, the power output unit 100 includes a first transistor U +, a second transistor V +, a third transistor W +, a fourth transistor U-, a fifth transistor V-, and a sixth transistor W-. The controlled terminal of the first transistor U +, the controlled terminal of the second transistor V +, the controlled terminal of the third transistor W +, the controlled terminal of the fourth transistor U-, the controlled terminal of the fifth transistor V-, and the controlled terminal of the sixth transistor W + are controlled terminals of the power output unit 100; an input end of the first transistor U +, an input end of the second transistor V +, an input end of the third transistor W +, and a positive electrode of the electrolytic capacitor C1 are interconnected, and an output end of the first transistor U +, an output end of the second transistor V +, an output end of the third transistor W +, and a negative electrode of the electrolytic capacitor C1 are interconnected; a connection node between the input terminal of the first transistor U + and the input terminal of the fourth transistor U-, a connection node between the output terminal of the second transistor V + and the input terminal of the fifth transistor V-, and a connection node between the output terminal of the third transistor W + and the input terminal of the sixth transistor W-are power output terminals of the power output unit 100.
Further, referring to fig. 5, the power supply circuit further includes a voltage boost unit 300, and a power output terminal of the voltage boost unit 300 is connected to a power input terminal of the electrolytic capacitor C1.
Wherein, the boosting unit 300 comprises an inductor L, a switch tube IGBT, a fast recovery diode FRD and a current detection resistor, the first end of the inductor L is connected with the first output end of the rectifier bridge, the second end of the inductor L, the input end of the switch tube IGBT and the anode of the fast recovery diode FRD are interconnected, the cathode of the fast recovery diode FRD, the anode of the electrolytic capacitor C1 and the input end of the first transistor U +, the input end of the second transistor V + and the input end of the third transistor W + are interconnected, the first end of the current detection resistor is connected with the second output end of the rectifier bridge, the second end of the current detection resistor, the output end of the switch tube IGBT, the negative electrode of the electrolytic capacitor C1, the output end of the fourth transistor U-, the output end of the fifth transistor V-and the output end of the sixth transistor W-are interconnected, and the controlled end of the switch tube IGBT is connected with the PWM output end of the control chip.
The present invention further provides a refrigeration apparatus, which includes the compressor 200 system as described above, and the specific structure of the compressor 200 system refers to the above embodiments, and since the refrigeration apparatus adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. The refrigeration device may be an air conditioner, a refrigerator, a freezer, etc., and is not limited herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A control method of a compressor, characterized by comprising the steps of:
s10, acquiring a preset reference voltage when the compressor operates at a preset weak magnetic depth coefficient and a preset mechanical rotating speed, wherein the weak magnetic depth coefficient is the ratio of a direct-axis reverse flux linkage generated by weak magnetic current in the motor to a permanent magnet flux linkage;
s20, acquiring the current direct current bus voltage;
s30, when the preset reference voltage is larger than the current direct current bus voltage, increasing the flux weakening depth coefficient to the maximum preset flux weakening depth coefficient, and then reducing the mechanical rotation speed until the current reference voltage when the compressor operates at the current flux weakening depth coefficient and the current mechanical rotation speed is not larger than the current direct current bus voltage;
s40, controlling the compressor to operate at the current flux weakening depth coefficient and the current mechanical speed;
wherein the step S30 includes:
s31, judging whether the preset reference voltage is less than or equal to the current direct current bus voltage;
if yes, executing step S32, and controlling the compressor to operate at the preset weak magnetic depth coefficient and the preset mechanical rotation speed;
if not, executing step S33 to increase the flux weakening depth coefficient;
wherein, before the step S33, the method further includes:
s331, judging whether a power supply circuit of the compressor has a boosting function;
if yes, executing step S332 to start the boost function of the power supply circuit to boost the dc bus voltage;
if not, the step S33 is executed.
2. The method for controlling a compressor according to claim 1, wherein the step S10 specifically includes:
s11, defining a reference voltage, and establishing a mapping relation among the reference voltage, a weak magnetic depth coefficient of the compressor and the mechanical rotating speed of the compressor;
and S12, calculating the preset weak magnetic depth and the preset reference voltage under the condition of the preset mechanical rotating speed according to the mapping relation.
3. The control method of a compressor according to claim 1, wherein the step of increasing the field weakening depth coefficient is performed simultaneously with the step of:
calculating a current weak magnetic depth coefficient and a first reference voltage under the condition of the preset mechanical rotating speed;
the step of calculating the current flux weakening depth coefficient and the first reference voltage under the preset mechanical rotation speed condition further comprises the following steps:
s34, judging whether the first reference voltage is less than or equal to the current direct current bus voltage
If yes, executing step S35, and controlling the compressor to operate at the current flux weakening depth coefficient and the preset mechanical rotation speed;
if not, executing step S36, and judging whether the current weak magnetic depth coefficient is less than or equal to the maximum preset weak magnetic depth coefficient;
if yes, go to step S33;
if not, executing the step S37, reducing the mechanical rotating speed, and calculating a maximum preset weak magnetic depth coefficient and a second reference voltage under the current mechanical rotating speed condition;
s38, judging whether the second reference voltage is less than or equal to the current direct current bus voltage;
if yes, executing step S39, and controlling the compressor to operate at the maximum preset weak magnetic depth coefficient and the current mechanical rotating speed;
if not, jumping to the step S37 until the second reference voltage is less than or equal to the current dc bus voltage.
4. The method for controlling a compressor according to claim 1, further comprising, after the step S332:
s333, judging whether the preset reference voltage is smaller than or equal to the boosted direct-current bus voltage;
if yes, go to step S32;
if not, the boosted dc bus voltage is used as the current dc bus voltage, and the process goes to step S33.
5. The method for controlling a compressor according to claim 1, further comprising, after the step S332:
s333, judging whether the preset reference voltage is smaller than or equal to the boosted direct-current bus voltage;
if yes, go to step S32;
if not, the boosted dc bus voltage is used as the current dc bus voltage, and the process skips to the step S331.
6. A compressor system comprising a compressor, a memory, a processor, and a control program for the compressor stored in the memory and operable in the processor;
the control program of the compressor, when executed by the processor, implements the steps of the control method of the compressor according to any one of claims 1 to 5.
7. The compressor system of claim 6, wherein the memory and the processor are integrated in a control chip, the compressor system further comprising a power supply circuit for providing an operating voltage to the compressor, the power supply circuit comprising an electrolytic capacitor and a power output unit, a power output terminal of the electrolytic capacitor being connected to a power input terminal of the power output unit, a power output terminal of the power output unit, a power input terminal of the compressor, and a power current sampling terminal of the control chip being interconnected, a control terminal of the control chip being connected to a controlled terminal of the power output unit.
8. The compressor system of claim 7, wherein the power supply circuit further comprises a boost unit having a power output terminal connected to a power input terminal of the electrolytic capacitor.
9. Refrigeration device, characterized in that it comprises a compressor system according to any one of claims 6 to 8.
Priority Applications (1)
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| CN111404429B (en) * | 2018-12-28 | 2021-11-12 | 比亚迪股份有限公司 | Vehicle, motor control method and device thereof and computer readable storage medium |
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