CN111404442B - Compressor control method and device, storage medium and compressor - Google Patents
Compressor control method and device, storage medium and compressor Download PDFInfo
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- CN111404442B CN111404442B CN202010237315.3A CN202010237315A CN111404442B CN 111404442 B CN111404442 B CN 111404442B CN 202010237315 A CN202010237315 A CN 202010237315A CN 111404442 B CN111404442 B CN 111404442B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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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
Abstract
The invention discloses a control method and a control device of a compressor, a storage medium and the compressor, wherein the method comprises the following steps: acquiring the demand frequency of a compressor; determining a PWM duty ratio and a bus voltage value of a PFC circuit in a control end of the compressor according to the required frequency of the compressor; and adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value so that the operating frequency of the compressor reaches the required frequency of the compressor. The scheme of the invention can solve the problem that the running frequency of the compressor cannot meet the required frequency when the required frequency of the compressor reaches the maximum value of the effective voltage of the compressor, and achieves the effect that the running frequency of the compressor can meet the required frequency.
Description
Technical Field
The invention belongs to the technical field of compressors, and particularly relates to a compressor control method, a compressor control device, a storage medium and a compressor, in particular to a compressor control method, a compressor control device, a storage medium and a compressor based on a multi-path interleaved PFC circuit.
Background
Generally, a control strategy of a compressor generally includes that a main control chip sends instruction frequency, and a driving module adjusts the frequency of the compressor, so that the frequency of the compressor reaches the frequency required by the main control; the control strategy is simple and effective, the control logic is simple, but when the required frequency reaches the maximum value of the effective voltage of the compressor, the effective voltage cannot be increased, so that the operating frequency of the compressor cannot meet the required frequency.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
Disclosure of Invention
The present invention aims to solve the above-mentioned drawbacks by providing a method and an apparatus for controlling a compressor, a storage medium, and a compressor, so as to solve the problem that the operating frequency of the compressor cannot meet the required frequency when the required frequency of the compressor reaches the maximum value of the effective voltage of the compressor, thereby achieving the effect that the operating frequency of the compressor can meet the required frequency.
The invention provides a control method of a compressor, which comprises the following steps: acquiring the demand frequency of a compressor; determining the PWM duty ratio and the bus voltage value of a PFC circuit in a control end of the compressor according to the demand frequency of the compressor; and adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value so that the operating frequency of the compressor reaches the required frequency of the compressor.
Optionally, determining a PWM duty cycle and a bus voltage value of a PFC circuit in a control terminal of the compressor includes: determining the corresponding relation among the set compressor frequency, the set PWM duty ratio and the set bus voltage value; and determining the set PWM duty ratio corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the PWM duty ratio of the PFC circuit in the control end of the compressor, and determining the set bus voltage value corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the bus voltage value of the PFC circuit in the control end of the compressor.
Optionally, adjusting the operating frequency of the compressor comprises: determining whether the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit; if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the running frequency of the compressor according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor; and if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the bus voltage value of the PFC circuit, and re-determining whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit.
Optionally, adjusting the operating frequency of the compressor further comprises: after the operating frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit, whether the adjusting frequency of the compressor reaches the required frequency of the compressor is determined; if the adjusting frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; and if the adjusting frequency of the compressor does not reach the demand frequency of the compressor, adjusting the running frequency of the compressor according to the effective voltage value of the compressor.
Optionally, adjusting the operating frequency of the compressor according to the effective voltage value of the compressor includes: determining whether the effective voltage value of the compressor reaches a set maximum voltage value; if the effective voltage value of the compressor reaches the set maximum voltage value, adjusting the running frequency of the compressor according to the current of the compressor; if the effective voltage value of the compressor does not reach the set maximum voltage value, the bus voltage value of the PFC circuit is readjusted, and whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is redetermined.
Optionally, adjusting the operating frequency of the compressor according to the current of the compressor comprises: adjusting the D-axis current and/or the Q-axis current of the compressor, and after the compressor enters a set flux weakening control process, determining whether the current frequency of the compressor reaches the required frequency of the compressor again; if the current frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; and if the current frequency of the compressor does not reach the demand frequency of the compressor, increasing the current frequency of the compressor to the demand frequency of the compressor.
In accordance with the above method, another aspect of the present invention provides a control apparatus for a compressor, comprising: an acquisition unit for acquiring a demand frequency of the compressor; the determining unit is used for determining the PWM duty ratio and the bus voltage value of a PFC circuit in the control end of the compressor according to the demand frequency of the compressor; and the control unit is used for adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value so as to enable the operating frequency of the compressor to reach the required frequency of the compressor.
Optionally, the determining unit determines a PWM duty ratio and a bus voltage value of a PFC circuit in the control terminal of the compressor, including: determining a corresponding relation among a set compressor frequency, a set PWM duty ratio and a set bus voltage value; and determining the set PWM duty ratio corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the PWM duty ratio of the PFC circuit in the control end of the compressor, and determining the set bus voltage value corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the bus voltage value of the PFC circuit in the control end of the compressor.
Optionally, the control unit adjusts an operating frequency of the compressor, comprising: determining whether the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit; if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the running frequency of the compressor according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor; and if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the bus voltage value of the PFC circuit, and re-determining whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit.
Optionally, the control unit adjusts an operating frequency of the compressor, further comprising: after the operating frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit, whether the adjusting frequency of the compressor reaches the required frequency of the compressor is determined; if the adjusting frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; and if the adjusting frequency of the compressor does not reach the demand frequency of the compressor, adjusting the running frequency of the compressor according to the effective voltage value of the compressor.
Optionally, the controlling unit adjusts the operating frequency of the compressor according to the effective voltage value of the compressor, and includes: determining whether the effective voltage value of the compressor reaches a set maximum voltage value; if the effective voltage value of the compressor reaches the set maximum voltage value, adjusting the running frequency of the compressor according to the current of the compressor; if the effective voltage value of the compressor does not reach the set maximum voltage value, the bus voltage value of the PFC circuit is readjusted, and whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is redetermined.
Optionally, the controlling unit adjusts an operating frequency of the compressor according to a current of the compressor, including: adjusting the D-axis current and/or the Q-axis current of the compressor, and determining whether the current frequency of the compressor reaches the required frequency of the compressor again after the compressor enters a set flux weakening control process; if the current frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; and if the current frequency of the compressor does not reach the demand frequency of the compressor, increasing the current frequency of the compressor to the demand frequency of the compressor.
In accordance with another aspect of the present invention, there is provided a compressor including: the control device for a compressor described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium comprising: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for loading and executing the control method of the compressor by the processor.
In accordance with the above method, a further aspect of the present invention provides a compressor, comprising: a processor for executing a plurality of instructions; a memory for storing a plurality of instructions; wherein the instructions are stored in the memory, and loaded by the processor and execute the control method of the compressor.
According to the scheme of the invention, the control of the compressor is associated with the boost control of the front end PFC, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the control of the compressor is kept in a high-efficiency state as far as possible, the frequency of the compressor can be further improved, the problem that the compressor cannot operate to meet the required frequency is solved, and the operating frequency of the compressor can meet the required frequency.
Furthermore, according to the scheme of the invention, the control of the compressor is associated with the boost control of the front end PFC, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the problems of low efficiency and heating of the compressor in a high-frequency state can be solved, the efficiency of the compressor is improved, and the heating is avoided.
Furthermore, according to the scheme of the invention, the compressor control is associated with the front-end PFC boost control, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the operation efficiency of the compressor can be improved, the self loss of the compressor is reduced, the circuit of the compressor is smaller, the problems of low efficiency and heating of the compressor in a high-frequency state can be solved, and the efficiency of the compressor is improved.
Furthermore, the scheme of the invention can improve the effective voltage value of the compressor to a certain extent by adjusting the control strategy of PFC to link with the control of the compressor, reduce the time for entering the field weakening and improve the running efficiency of the compressor.
Furthermore, the scheme of the invention can reduce the current, improve the efficiency of the compressor and avoid heating by adjusting the control strategy of the PFC to be linked with the control of the compressor.
Therefore, according to the scheme of the invention, the control requirement of the compressor is met by associating the compressor control with the front-end PFC boost control and adjusting the control strategy of the PFC, so that the problem that the running frequency of the compressor cannot meet the required frequency when the required frequency of the compressor reaches the maximum value of the effective voltage of the compressor in a mode of adjusting the frequency of the compressor by the driving module is solved, and the effect of enabling the running frequency of the compressor to meet the required frequency is achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
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 one embodiment of determining PWM duty cycle and bus voltage values of a PFC circuit in the control terminal of the compressor in the method of the present invention;
FIG. 3 is a schematic flow chart illustrating one embodiment of adjusting the operating frequency of the compressor in the method of the present invention;
FIG. 4 is a schematic flow chart of another embodiment of adjusting the operating frequency of a compressor in the method of the present invention;
FIG. 5 is a schematic flow chart illustrating an embodiment of adjusting the operating frequency of the compressor according to the effective voltage value of the compressor in the method of the present invention;
FIG. 6 is a schematic flow chart illustrating one embodiment of adjusting the operating frequency of the compressor based on the current to the compressor in the method of the present invention;
FIG. 7 is a schematic structural diagram of a control device of a compressor according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an embodiment of a compressor control circuit;
fig. 9 is a schematic structural diagram of an embodiment of a PFC control circuit;
FIG. 10 is a schematic flow chart diagram of an embodiment of a compressor control strategy;
fig. 11 is a flowchart illustrating an embodiment of a PFC and compressor coordinated control strategy.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
102-an acquisition unit; 104-a determination unit; 106-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. 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.
According to an embodiment of the present invention, a method for controlling a compressor is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The control method of the compressor can comprise the following steps: step S110 to step S130.
At step S110, a demand frequency of the compressor is acquired. Wherein, the demand frequency of the compressor is the target frequency of the compressor.
At step S120, a PWM duty ratio and a bus voltage value of a PFC circuit in a control terminal of the compressor are determined according to a demand frequency of the compressor.
Optionally, the step S120 of determining the PWM duty cycle and the bus voltage value of the PFC circuit at the control end of the compressor according to the demand frequency of the compressor may be combined with a schematic flow chart of an embodiment of determining the PWM duty cycle and the bus voltage value of the PFC circuit at the control end of the compressor in the method of the present invention shown in fig. 2, to further describe a specific process of determining the PWM duty cycle and the bus voltage value of the PFC circuit at the control end of the compressor at the step S120, and the specific process may include: step S210 and step S220.
Step S210, determining a correspondence between the set compressor frequency, the set PWM duty and the set bus voltage value.
Step S220, determining a set PWM duty corresponding to a set compressor frequency that is the same as the required frequency of the compressor in the correspondence relationship as a PWM duty of a PFC circuit in the control end of the compressor, and determining a set bus voltage value corresponding to the set compressor frequency that is the same as the required frequency of the compressor in the correspondence relationship as a bus voltage value of the PFC circuit in the control end of the compressor. The bus voltage value of the PFC circuit is not higher than the withstand voltage bearing range of the device.
For example: when the compressor runs, a mathematical model is established between PFC and compressor frequency power, PFC loss and compressor loss are calculated to obtain bus voltage at an optimal efficiency point, and then the compressor frequency is adjusted to obtain the PFC and compressor frequency power. Wherein the bus voltage is
Namely, the bus voltage is greater than or equal to (relative to off PFC), and the bus voltage value needs to be within the withstand voltage tolerance range of the device.
Therefore, the PWM duty ratio and the bus voltage value of the PFC circuit in the control end of the compressor are determined according to the required frequency of the compressor, so that the running frequency of the compressor can be adjusted based on the PWM duty ratio and the bus voltage value of the PFC circuit, the running frequency of the compressor can reach the required frequency, and the efficiency of the compressor cannot be reduced.
At step S130, the operating frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit and the bus voltage value so that the operating frequency of the compressor reaches the required frequency of the compressor.
For example: a compressor control method based on a multi-path staggered PFC circuit is characterized in that a control strategy of PFC is adjusted to be linked with compressor control, and the purpose that bus voltage is used as a variable value to be calculated with a compressor frequency power parameter is achieved, so that the operation efficiency of a compressor is improved.
For example: the compressor control is associated with the front end PFC boost control, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the compressor control is kept in a high-efficiency state as far as possible, the frequency of the compressor can be further improved, and the problem that the compressor cannot operate to meet the requirement is solved. The running efficiency of compressor can be promoted, the self loss of compressor is reduced, the compressor circuit is smaller, and the problems of low efficiency and heating under the high-frequency state of the compressor can be solved.
Therefore, the operation frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit and the bus voltage value, so that the operation frequency of the compressor reaches the required frequency of the compressor, the problem that the operation frequency of the compressor cannot meet the required frequency is solved, and the operation efficiency of the compressor is improved.
Optionally, the first process of adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value in step S130 may be further described with reference to a flowchart of an embodiment of adjusting the operating frequency of the compressor in the method of the present invention shown in fig. 3, where the first process of adjusting the operating frequency of the compressor in step S130 includes: step S310 to step S330.
Step S310, determining whether the bus voltage value of the PFC circuit is a voltage value corresponding to a set maximum efficiency point of the PFC circuit.
And step S320, if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor.
In step S330, if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, the bus voltage value of the PFC circuit is adjusted, and it is determined whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit again.
For example: the main control circuit sends out the required frequency for adjusting the frequency of the compressor. The PWM duty cycle and the bus voltage value are estimated from the compressor demand frequency. And judging whether the bus voltage value is a set maximum efficiency point, if so, adjusting the frequency of the compressor according to the PWM duty ratio, otherwise, adjusting the strategy of the PFC circuit and continuously changing the bus voltage value.
Therefore, under the condition that the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, the operating frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor, and the operating frequency of the compressor can be adjusted quickly so as to reach the required frequency quickly.
Optionally, the second process of adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value in step S130 may further describe, with reference to a flowchart of another embodiment of adjusting the operating frequency of the compressor in the method of the present invention shown in fig. 4, another specific process of adjusting the operating frequency of the compressor in step S130, which may include: step S410 to step S430.
And step S410, after the operation frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit, determining whether the adjustment frequency of the compressor reaches the demand frequency of the compressor.
And step S420, if the adjusting frequency of the compressor reaches the required frequency of the compressor, taking the adjusting frequency of the compressor as the operating frequency of the compressor, and controlling the compressor to operate according to the adjusting frequency.
In step S430, if the adjusting frequency of the compressor does not reach the demand frequency of the compressor, the operating frequency of the compressor is adjusted according to the effective voltage value of the compressor.
For example: and after the frequency of the compressor is adjusted according to the PWM duty ratio, judging whether the voltage value of the bus is a set highest efficiency point, if so, adjusting the frequency of the compressor according to the PWM duty ratio, judging whether the operation frequency of the adjusted compressor meets the required frequency required by the main control circuit by the driving circuit, and if so, determining that the adjustment is finished. Otherwise, the running frequency of the compressor is adjusted according to the effective voltage value of the compressor.
Therefore, when the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, the bus voltage value of the PFC circuit is adjusted, whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is determined again, and the operating frequency of the compressor is adjusted in a mode of adjusting the bus voltage of the PFC circuit, so that the operating frequency of the compressor can reach the required frequency quickly.
More optionally, the step S430 of adjusting the operating frequency of the compressor according to the effective voltage value of the compressor may be combined with a flow chart of an embodiment of the method shown in fig. 5 of the present invention, where the flow chart of the method of adjusting the operating frequency of the compressor according to the effective voltage value of the compressor, to further describe a specific process of adjusting the operating frequency of the compressor according to the effective voltage value of the compressor in the step S430, and the specific process may include: step S510 to step S530.
Step S510, determining whether the effective voltage value of the compressor reaches a set maximum voltage value.
Step S520, if the effective voltage value of the compressor reaches the set maximum voltage value, adjusting the operating frequency of the compressor according to the current of the compressor.
Further alternatively, the step S520 of adjusting the operating frequency of the compressor according to the current of the compressor may be further described with reference to a flowchart of an embodiment of adjusting the operating frequency of the compressor according to the current of the compressor in the method of the present invention shown in fig. 6, where the step S520 of adjusting the operating frequency of the compressor according to the current of the compressor may include: step S610 to step S630.
And step S610, adjusting the D-axis current and/or the Q-axis current of the compressor, and determining whether the current frequency of the compressor reaches the required frequency of the compressor again after the compressor enters a set flux weakening control process.
And step S620, if the current frequency of the compressor reaches the required frequency of the compressor, taking the current frequency of the compressor as the running frequency of the compressor, and controlling the compressor to run according to the adjusting frequency.
In step S630, if the current frequency of the compressor does not reach the demand frequency of the compressor, the current frequency of the compressor is increased to the demand frequency of the compressor.
For example: if the voltage value of the compressor reaches the set maximum value, the D-axis and Q-axis currents of the compressor are adjusted, and the compressor enters flux weakening control. After the compressor enters the flux weakening control, judging whether the frequency of the compressor meets the required frequency of the main control circuit again, if so, determining to finish the adjustment; otherwise, the compressor frequency is increased continuously to bring the compressor frequency as close as possible to the demand frequency.
Therefore, the running frequency of the compressor is adjusted according to the current of the compressor under the condition that the effective voltage value of the compressor reaches the set maximum voltage value, the running frequency of the compressor can reach the required frequency quickly, the running efficiency of the compressor can be ensured, and the compressor is prevented from heating.
In step S530, if the effective voltage value of the compressor does not reach the set maximum voltage value, the bus voltage value of the PFC circuit is readjusted, and it is determined whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit.
For example: the operation frequency of the compressor is adjusted according to the effective voltage value of the compressor, and specifically, the operation frequency may be: and judging whether the voltage value of the compressor reaches a set maximum value, and if the voltage value of the compressor reaches the set maximum value, adjusting the currents of a D shaft and a Q shaft of the compressor to enable the compressor to enter flux weakening control. If the current of the compressor does not reach the set maximum value, the bus voltage value is continuously changed.
Therefore, the running frequency of the compressor is adjusted according to the effective voltage value of the compressor under the condition that the effective voltage value of the compressor reaches the set maximum voltage value, the running frequency of the compressor can be enabled to reach the required frequency quickly, and the running efficiency of the compressor can be guaranteed.
Through a large amount of tests, the technical scheme of the embodiment is adopted, the compressor control is associated with the front end PFC boost control, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the compressor control is kept in a high-efficiency state as far as possible, the frequency of the compressor can be further improved, the problem that the compressor cannot operate to meet the requirement is solved, and the operating frequency of the compressor can meet the requirement frequency.
According to an embodiment of the present invention, there is also provided a control apparatus of a compressor corresponding to the control method of the compressor. Referring to fig. 7, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The control device of the compressor may include: an acquisition unit 102, a determination unit 104, and a control unit 106.
Specifically, the obtaining unit 102 may be configured to obtain a demand frequency of the compressor. Wherein, the demand frequency of the compressor is the target frequency of the compressor. The specific functions and processes of the acquiring unit 102 are referred to in step S110.
Specifically, the determining unit 104 may be configured to determine a PWM duty cycle and a bus voltage value of a PFC circuit in a control terminal of the compressor according to a demand frequency of the compressor. The specific function and processing of the determination unit 104 are referred to in step S120.
Optionally, the determining unit 104 determines the PWM duty cycle and the bus voltage value of the PFC circuit in the control end of the compressor according to the demanded frequency of the compressor, and may include:
the determining unit 104 is further configured to determine a corresponding relationship between the set compressor frequency, the set PWM duty and the set bus voltage value. The specific function and processing of the determination unit 104 are also referred to in step S210.
The determining unit 104 is further specifically configured to determine a set PWM duty cycle corresponding to a set compressor frequency that is the same as the demand frequency of the compressor in the correspondence relationship as the PWM duty cycle of the PFC circuit in the control end of the compressor, and determine a set bus voltage value corresponding to the set compressor frequency that is the same as the demand frequency of the compressor in the correspondence relationship as the bus voltage value of the PFC circuit in the control end of the compressor. The bus voltage value of the PFC circuit is not higher than the withstand voltage bearing range of the device. The specific function and processing of the determination unit 104 are also referred to in step S220.
For example: when the compressor runs, a mathematical model is established between PFC and compressor frequency power, PFC loss and compressor loss are calculated to obtain bus voltage at an optimal efficiency point, and then the compressor frequency is adjusted to obtain the PFC and compressor frequency power. Wherein the bus voltage is
That is, the bus voltage is greater than or equal to (relative to off PFC), and the bus voltage value needs to be within the withstand voltage range of the device.
Therefore, the PWM duty ratio and the bus voltage value of the PFC circuit in the control end of the compressor are determined according to the required frequency of the compressor, so that the running frequency of the compressor can be adjusted based on the PWM duty ratio and the bus voltage value of the PFC circuit, the running frequency of the compressor can reach the required frequency, and the efficiency of the compressor cannot be reduced.
Specifically, the control unit 106 may be configured to adjust the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value, so that the operating frequency of the compressor reaches the required frequency of the compressor. The specific function and processing of the determination unit 104 are referred to in step S130.
For example: a compressor control device based on a multi-path staggered PFC circuit is linked with compressor control by adjusting a control strategy of PFC and aims to calculate a bus voltage as a variable value and a compressor frequency power parameter so as to improve the operation efficiency of a compressor.
For example: the control of the compressor is associated with the boost control of the front-end PFC, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the control of the compressor is kept in a high-efficiency state as far as possible, the frequency of the compressor can be further improved, and the problem that the compressor cannot operate to meet the requirement is solved; the running efficiency of compressor can be promoted, the self loss of compressor is reduced, the compressor circuit is smaller, and the problems of low efficiency and heating under the high-frequency state of the compressor can be solved.
Therefore, the operation frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit and the bus voltage value, so that the operation frequency of the compressor reaches the required frequency of the compressor, the problem that the operation frequency of the compressor cannot meet the required frequency is solved, and the operation efficiency of the compressor is improved.
Optionally, the adjusting the operating frequency of the compressor by the control unit 106 according to the PWM duty cycle of the PFC circuit and the bus voltage value may include:
the control unit 106 is further specifically configured to determine whether a bus voltage value of the PFC circuit is a voltage value corresponding to a set maximum efficiency point of the PFC circuit. The specific functions and processes of the control unit 106 are also referred to in step S310.
The control unit 106 is further specifically configured to adjust the operating frequency of the compressor according to the PWM duty cycle of the PFC circuit to obtain the adjustment frequency of the compressor if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit. The detailed function and processing of the control unit 106 are also referred to as step S320.
The control unit 106 is further specifically configured to adjust the bus voltage value of the PFC circuit if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, and to determine whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit again. The specific function and processing of the control unit 106 are also referred to in step S330.
For example: the main control circuit sends out the required frequency for adjusting the frequency of the compressor. The PWM duty cycle, and thus the bus voltage value, is estimated from the compressor demand frequency. And judging whether the bus voltage value is a set maximum efficiency point, if so, adjusting the frequency of the compressor according to the PWM duty ratio, otherwise, adjusting the strategy of the PFC circuit and continuously changing the bus voltage value.
Therefore, under the condition that the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, the operating frequency of the compressor is adjusted according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor, and the operating frequency of the compressor can be adjusted quickly so as to reach the required frequency quickly.
Optionally, the controlling unit 106 adjusts the operating frequency of the compressor according to the PWM duty cycle of the PFC circuit and the bus voltage value, and may further include:
the control unit 106 is further specifically configured to determine whether the adjustment frequency of the compressor reaches the demand frequency of the compressor after adjusting the operating frequency of the compressor according to the PWM duty cycle of the PFC circuit. The specific function and processing of the control unit 106 are also referred to as step S410.
The control unit 106 is further configured to, if the adjusting frequency of the compressor reaches the demanded frequency of the compressor, use the adjusting frequency of the compressor as the operating frequency of the compressor, and control the compressor to operate at the adjusting frequency. The specific function and processing of the control unit 106 are also referred to as step S420.
The control unit 106 is further configured to adjust the operating frequency of the compressor according to the effective voltage value of the compressor if the adjusting frequency of the compressor does not reach the demand frequency of the compressor. The detailed function and processing of the control unit 106 are also referred to in step S430.
For example: after the frequency of the compressor is adjusted according to the PWM duty ratio, whether the voltage value of a bus is a set highest efficiency point is judged, if yes, the frequency of the compressor is adjusted according to the PWM duty ratio, whether the operating frequency of the adjusted compressor meets the required frequency required by a main control circuit is judged by a driving circuit, and if yes, the adjustment is determined to be completed; otherwise, the running frequency of the compressor is adjusted according to the effective voltage value of the compressor.
Therefore, when the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, the bus voltage value of the PFC circuit is adjusted, whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is determined again, and the operating frequency of the compressor is adjusted in a mode of adjusting the bus voltage of the PFC circuit, so that the operating frequency of the compressor can reach the required frequency quickly.
More optionally, the controlling unit 106 adjusts the operating frequency of the compressor according to the effective voltage value of the compressor, and may include:
the control unit 106 is further configured to determine whether the effective voltage value of the compressor reaches a set maximum voltage value. The specific functions and processes of the control unit 106 are also referred to in step S510.
The control unit 106 is further configured to adjust the operating frequency of the compressor according to the current of the compressor if the effective voltage value of the compressor reaches the set maximum voltage value. The detailed function and processing of the control unit 106 are also referred to in step S520.
Still further alternatively, the controlling unit 106 adjusting the operating frequency of the compressor according to the current of the compressor may include:
the control unit 106 is specifically configured to adjust a D-axis current and/or a Q-axis current of the compressor, so that after the compressor enters a set flux weakening control process, it is determined again whether a current frequency of the compressor reaches a required frequency of the compressor. The specific function and processing of the control unit 106 are also referred to as step S610.
The control unit 106 is further configured to use the current frequency of the compressor as the operating frequency of the compressor if the current frequency of the compressor reaches the demanded frequency of the compressor, and control the compressor to operate at the adjustment frequency. The specific function and processing of the control unit 106 are also referred to in step S620.
The control unit 106 is further configured to increase the current frequency of the compressor to the demanded frequency of the compressor if the current frequency of the compressor does not reach the demanded frequency of the compressor. The specific function and processing of the control unit 106 are also referred to in step S630.
For example: and if the voltage value of the compressor reaches the set maximum value, adjusting the currents of the D shaft and the Q shaft of the compressor to enable the compressor to enter flux weakening control. After the compressor enters the flux weakening control, judging whether the frequency of the compressor meets the required frequency of the main control circuit again, if so, determining to finish the adjustment; otherwise, the compressor frequency is increased continuously to bring the compressor frequency as close as possible to the demand frequency.
Therefore, the running frequency of the compressor is adjusted according to the current of the compressor under the condition that the effective voltage value of the compressor reaches the set maximum voltage value, the running frequency of the compressor can be enabled to reach the required frequency quickly, the running efficiency of the compressor can be guaranteed, and the compressor is prevented from heating.
The control unit 106 is further configured to readjust the bus voltage value of the PFC circuit if the effective voltage value of the compressor does not reach the set maximum voltage value, and to re-determine whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit. The specific functions and processes of the control unit 106 are also referred to in step S530.
For example: the operation frequency of the compressor is adjusted according to the effective voltage value of the compressor, and specifically, the operation frequency may be: and judging whether the voltage value of the compressor reaches a set maximum value, and if the voltage value of the compressor reaches the set maximum value, adjusting the currents of a D shaft and a Q shaft of the compressor to enable the compressor to enter flux weakening control. If the current of the compressor does not reach the set maximum value, the bus voltage value is continuously changed.
Therefore, the running frequency of the compressor is adjusted according to the effective voltage value of the compressor under the condition that the effective voltage value of the compressor reaches the set maximum voltage value, the running frequency of the compressor can be enabled to reach the required frequency quickly, and the running efficiency of the compressor can be guaranteed.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to fig. 6, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, the control of the compressor is associated with the boost control of the front-end PFC, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the problems of low efficiency and heating of the compressor in a high-frequency state can be solved, the efficiency of the compressor is improved, and the heating is avoided.
According to an embodiment of the present invention, there is also provided a compressor corresponding to a control apparatus of the compressor. The compressor may include: the control device for a compressor described above.
Fig. 8 is a schematic diagram of a compressor control circuit.
As can be seen from fig. 8, in the compressor control circuit, the rectifier circuit, the PFC circuit, the IPM circuit and the compressor are sequentially connected, the main control circuit is connected with the driving control circuit, and the driving control circuit is respectively connected to the PFC circuit and the IPM circuit. The PFC circuit can be a multi-path PFC with a boost circuit.
Fig. 9 is a schematic diagram of the PFC control circuit. As shown in fig. 9, there is no relationship between the PFC circuit control and the compressor control. The unit operation logic is that the PFC boosting is adjusted to reach a stable fixed voltage value, and then the compressor is operated.
FIG. 10 is a flow chart illustrating a compressor control strategy. As shown in fig. 10, the logic manner of adjusting the frequency of the compressor may specifically include:
and step 11, sending a compressor frequency requirement by the main control circuit.
And step 12, the driving circuit receives a command sent by the main control circuit, and adjusts the PWM duty ratio to change the effective voltage value of the compressor.
And step 13, adjusting the frequency of the compressor along with the change of the effective value voltage of the compressor.
Step 14, the driving circuit judges whether the running frequency of the adjusted compressor reaches the required frequency sent by the main control circuit, and if so, the adjustment of the frequency of the compressor is completed; if not, it is determined whether the effective voltage value of the compressor has reached the set maximum value, if so, step 15 is executed, otherwise, it returns to step 12.
Step 15, adjusting the currents of the D shaft and the Q shaft of the compressor to enable the compressor to enter magnetic control, then judging whether the frequency of the compressor meets the required frequency required by the main control circuit again, and if so, finishing the adjustment; otherwise, the frequency of the compressor is further increased to be as close as possible to the required frequency required by the main control circuit, so that the adjustment of the frequency of the compressor is completed. When the effective voltage of the compressor cannot be raised, the compressor needs to enter a weak magnetic state; the compressor frequency can be increased by reducing the Q-axis current of the compressor, but this time the compressor is required to operate at a lower efficiency in order to be as close as possible to the desired frequency.
In an optional embodiment, the scheme of the invention provides a compressor control method based on a multi-path interleaved PFC circuit, which is used for calculating a frequency power parameter of a compressor by taking a bus voltage as a variable value by adjusting a control strategy of the PFC to be linked with the compressor control, so as to improve the operation efficiency of the compressor.
Fig. 11 is a flowchart illustrating an embodiment of a PFC and compressor coordinated control strategy. As shown in fig. 11, the PFC and compressor coordinated control strategy may include:
and step 21, sending out the required frequency for adjusting the frequency of the compressor by the main control circuit.
And step 22, estimating the PWM duty ratio and the bus voltage value through the compressor demand frequency.
Step 23, judging whether the bus voltage value is a set maximum efficiency point, if so, adjusting the frequency of the compressor according to the PWM duty ratio, and executing step 24; otherwise, the strategy of the PFC circuit is adjusted, and the voltage value of the bus is continuously changed.
Step 24, judging whether the operating frequency of the adjusted compressor meets the required frequency required by the main control circuit by the driving circuit, and if so, determining that the adjustment is finished; otherwise, judging whether the voltage value of the compressor reaches the set maximum value, if the voltage value of the compressor reaches the set maximum value, adjusting the currents of the D shaft and the Q shaft of the compressor to enable the compressor to enter the field weakening control, and then executing the step 25; if the compressor current does not reach the set maximum value, the bus voltage value is continuously changed.
Step 25, after the compressor enters the flux weakening control, judging whether the frequency of the compressor meets the required frequency of the main control circuit again, if so, determining that the adjustment is finished; otherwise, the compressor frequency is continuously increased to be as close as possible to the required frequency.
When the control method provided by the scheme of the invention is used, when the compressor runs, a mathematical model is established by PFC and compressor frequency power, PFC loss and compressor loss are calculated to obtain bus voltage at an optimal efficiency point, and then the compressor frequency is adjusted to obtain the PFC and compressor frequency power.
Wherein the bus voltage is
That is, the bus voltage is greater than or equal to (relative to off PFC), and the bus voltage value needs to be within the withstand voltage range of the device.
In the scheme of the invention, if the compressor runs at a low frequency, the frequency of the compressor is adjusted by calculating the voltage of the bus, so that the voltage can be properly reduced, and the efficiency of the PFC circuit is higher; due to the fact that the bus voltage is reduced, PWM does not need to be adjusted to operate under a low duty ratio, and control is simpler; when the compressor needs very high frequency, the original control logic enters a weak magnetic low-efficiency state very early, but the control method provided by the scheme of the invention can adjust the voltage rise of the bus (within the voltage-resistant range of the device), so that the effective voltage value of the compressor is improved to a certain extent, the time for entering the weak magnetic is reduced, the current is reduced, and the efficiency of the compressor is improved.
Therefore, according to the scheme of the invention, the control requirement of the compressor is met by associating the control of the compressor with the boost control of the front end PFC and adjusting the control strategy of the PFC, so that the control of the compressor is kept in a high-efficiency state as far as possible, the frequency of the compressor can be further improved, and the problem that the compressor cannot operate to meet the requirement is solved; the running efficiency of compressor can be promoted, the self loss of compressor is reduced, the compressor circuit is smaller, and the problems of low efficiency and heating under the high-frequency state of the compressor can be solved.
Since the processes and functions of the compressor of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 7, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large number of tests, the technical scheme of the invention is adopted, the compressor control is associated with the front-end PFC boost control, and the control requirement of the compressor is met by adjusting the control strategy of the PFC, so that the operation efficiency of the compressor can be improved, the loss of the compressor is reduced, the circuit of the compressor is smaller, the problems of low efficiency and heating of the compressor in a high-frequency state can be solved, and the efficiency of the compressor is improved.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of a compressor. The storage medium may include: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for loading and executing the control method of the compressor by the processor.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the methods shown in fig. 1 to fig. 6, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, and the control strategy of PFC is adjusted to be linked with the control of the compressor, so that the effective voltage value of the compressor is improved to a certain extent, the time for entering weak magnetism is reduced, and the operation efficiency of the compressor can be improved.
According to an embodiment of the present invention, there is also provided a compressor corresponding to a control method of the compressor. The compressor may include: a processor for executing a plurality of instructions; a memory for storing a plurality of instructions; wherein the instructions are stored in the memory, and loaded by the processor to execute the control method of the compressor.
Since the processes and functions of the compressor of this embodiment are basically corresponding to the embodiments, principles and examples of the methods shown in fig. 1 to fig. 6, the details of the compressor of this embodiment are not described in detail herein, and reference may be made to the related descriptions in the embodiments described above, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, and the control strategy of PFC is adjusted to be linked with the control of the compressor, so that the current can be reduced, the efficiency of the compressor is improved, and the heating is avoided.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A control method of a compressor, characterized by comprising:
acquiring the demand frequency of a compressor;
determining a PWM duty ratio and a bus voltage value of a PFC circuit in a control end of the compressor according to the required frequency of the compressor;
adjusting the operating frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value so that the operating frequency of the compressor reaches the required frequency of the compressor;
wherein, adjusting the operating frequency of the compressor includes: determining whether the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit; if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the running frequency of the compressor according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor; if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the bus voltage value of the PFC circuit, and re-determining whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit;
adjusting an operating frequency of the compressor, further comprising: determining whether the adjustment frequency of the compressor reaches a required frequency of the compressor after adjusting the operation frequency of the compressor according to the PWM duty ratio of the PFC circuit; if the adjusting frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; if the adjusting frequency of the compressor does not reach the demand frequency of the compressor, adjusting the running frequency of the compressor according to the effective voltage value of the compressor;
the compressor control circuit is characterized in that a rectification circuit, a PFC circuit, an IPM circuit and the compressor are sequentially connected, a main control circuit is connected with a drive control circuit, and the drive control circuit is respectively connected to the PFC circuit and the IPM circuit; the PFC circuit is a multi-path PFC with a boost circuit;
if the compressor runs at a low frequency, the frequency of the compressor is adjusted by calculating the bus voltage, and the voltage is properly reduced; when the compressor needs very high frequency, the voltage of the bus is adjusted to be increased, so that the effective voltage value of the compressor is increased to a certain extent, and the time for entering the field weakening is reduced.
2. The method of claim 1, wherein determining the PWM duty cycle and the bus voltage value of the PFC circuit in the control terminal of the compressor comprises:
determining the corresponding relation among the set compressor frequency, the set PWM duty ratio and the set bus voltage value;
and determining the set PWM duty ratio corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the PWM duty ratio of the PFC circuit in the control end of the compressor, and determining the set bus voltage value corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the bus voltage value of the PFC circuit in the control end of the compressor.
3. The method as claimed in claim 1, wherein the adjusting of the operating frequency of the compressor according to the effective voltage value of the compressor comprises:
determining whether the effective voltage value of the compressor reaches a set maximum voltage value;
if the effective voltage value of the compressor reaches the set maximum voltage value, adjusting the running frequency of the compressor according to the current of the compressor;
if the effective voltage value of the compressor does not reach the set maximum voltage value, the bus voltage value of the PFC circuit is readjusted, and whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is redetermined.
4. The method as claimed in claim 3, wherein the adjusting of the operating frequency of the compressor according to the current of the compressor comprises:
adjusting the D-axis current and/or the Q-axis current of the compressor, and determining whether the current frequency of the compressor reaches the required frequency of the compressor again after the compressor enters a set flux weakening control process;
if the current frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency;
and if the current frequency of the compressor does not reach the demand frequency of the compressor, increasing the current frequency of the compressor to the demand frequency of the compressor.
5. A control device of a compressor, characterized by comprising:
an acquisition unit for acquiring a demand frequency of the compressor;
the determining unit is used for determining the PWM duty ratio and the bus voltage value of a PFC circuit in the control end of the compressor according to the demand frequency of the compressor;
the control unit is used for adjusting the running frequency of the compressor according to the PWM duty ratio of the PFC circuit and the bus voltage value so as to enable the running frequency of the compressor to reach the required frequency of the compressor;
wherein, the operating frequency of control unit regulation compressor includes: determining whether the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit; if the bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the running frequency of the compressor according to the PWM duty ratio of the PFC circuit to obtain the adjusting frequency of the compressor; if the bus voltage value of the PFC circuit is not the voltage value corresponding to the set maximum efficiency point of the PFC circuit, adjusting the bus voltage value of the PFC circuit, and re-determining whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit;
the control unit adjusts an operating frequency of the compressor, and further includes: determining whether the adjustment frequency of the compressor reaches a required frequency of the compressor after adjusting the operation frequency of the compressor according to the PWM duty ratio of the PFC circuit; if the adjusting frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency; if the adjusting frequency of the compressor does not reach the demand frequency of the compressor, adjusting the running frequency of the compressor according to the effective voltage value of the compressor;
the compressor control circuit is characterized in that the rectification circuit, the PFC circuit, the IPM circuit and the compressor are sequentially connected, the main control circuit is connected with the drive control circuit, and the drive control circuit is respectively connected to the PFC circuit and the IPM circuit; the PFC circuit is a multi-path PFC with a boost circuit;
if the compressor runs at a low frequency, the frequency of the compressor is adjusted by calculating the bus voltage, and the voltage is properly reduced; when the compressor needs very high frequency, the voltage of the bus is adjusted to rise, so that the effective voltage value of the compressor is improved to a certain extent, and the time for entering weak magnetism is reduced.
6. The control apparatus of a compressor according to claim 5, wherein the determining unit determines the PWM duty ratio and the bus voltage value of the PFC circuit in the control terminal of the compressor, including:
determining a corresponding relation among a set compressor frequency, a set PWM duty ratio and a set bus voltage value;
and determining the set PWM duty ratio corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the PWM duty ratio of the PFC circuit in the control end of the compressor, and determining the set bus voltage value corresponding to the set compressor frequency which is the same as the demand frequency of the compressor in the corresponding relation as the bus voltage value of the PFC circuit in the control end of the compressor.
7. The control apparatus of a compressor according to claim 5, wherein the control unit adjusts an operation frequency of the compressor according to the effective voltage value of the compressor, comprising:
determining whether the effective voltage value of the compressor reaches a set maximum voltage value;
if the effective voltage value of the compressor reaches the set maximum voltage value, adjusting the running frequency of the compressor according to the current of the compressor;
if the effective voltage value of the compressor does not reach the set maximum voltage value, the bus voltage value of the PFC circuit is readjusted, and whether the adjusted bus voltage value of the PFC circuit is the voltage value corresponding to the set maximum efficiency point of the PFC circuit is redetermined.
8. The control apparatus of a compressor according to claim 5, wherein the control unit adjusts an operating frequency of the compressor according to a current of the compressor, comprising:
adjusting the D-axis current and/or the Q-axis current of the compressor, and determining whether the current frequency of the compressor reaches the required frequency of the compressor again after the compressor enters a set flux weakening control process;
if the current frequency of the compressor reaches the required frequency of the compressor, controlling the compressor to operate according to the adjusting frequency;
and if the current frequency of the compressor does not reach the demand frequency of the compressor, increasing the current frequency of the compressor to the demand frequency of the compressor.
9. A compressor, comprising: a control device of the compressor according to any one of claims 5 to 8;
alternatively, the method comprises the following steps:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
wherein the plurality of instructions for being stored by the memory and being loaded and executed by the processor perform the control method of the compressor of any one of claims 1 to 4.
10. A storage medium having a plurality of instructions stored therein; the plurality of instructions for being loaded by a processor and executing the control method of the compressor according to any one of claims 1 to 4.
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| CN113279947B (en) * | 2021-06-07 | 2021-10-26 | 哈尔滨硕诺科技有限公司 | Intelligent water pump energy-saving control system |
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| CN103378788B (en) * | 2012-04-28 | 2015-11-25 | 瑞萨电子(中国)有限公司 | The driving method of convertible frequency air-conditioner compressor and device |
| CN104214886B (en) * | 2013-05-30 | 2017-03-29 | 广东美的制冷设备有限公司 | The control method of convertible frequency air-conditioner |
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