CN111256275B - Operation control method and system, compressor and air conditioner - Google Patents
Operation control method and system, compressor and air conditioner Download PDFInfo
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- CN111256275B CN111256275B CN201811458686.3A CN201811458686A CN111256275B CN 111256275 B CN111256275 B CN 111256275B CN 201811458686 A CN201811458686 A CN 201811458686A CN 111256275 B CN111256275 B CN 111256275B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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Abstract
The invention provides an operation control method, an operation control system, a compressor, an air conditioner and a computer readable storage medium; the operation control method comprises the following steps: detecting a power supply signal of a bus; determining a fundamental wave phase corresponding to the power supply signal, and determining a higher harmonic signal corresponding to the fundamental wave phase; and determining the duty ratio input to the power factor correction controller according to the higher harmonic signal. The technical scheme who has used this application to inject is through confirming the higher harmonic signal that corresponds according to bus power supply signal, and the duty cycle of control PFC controller injects the higher harmonic signal into the fundamental wave signal, and then reduces the input current fluctuation of generating line, makes bus capacitor no longer need through strong charge-discharge with the holding current stable, consequently can effectual reduction bus capacitor calorific capacity, makes can not change large capacity bus capacitor, promote bus capacitor's reliability and life under the condition that does not increase hardware cost.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to an operation control method, an operation control system, a compressor, an air conditioner and a computer readable storage medium.
Background
Generally, in the application field of a household air conditioner and the like, a Power Factor Correction (PFC) circuit is generally used to correct a Power Factor, and after an alternating current is input through a rectifier and the PFC circuit, a relatively stable direct current is supplied by a large-capacity electrolytic capacitor. On the ac input side, the mains grid is usually connected, the grid voltage is a sine wave, and under the action of the PFC, the ac side current will follow the ac voltage and also appear as a sine wave, so the ac input power fluctuates greatly and the frequency is twice the grid frequency, as a result, the dc bus input current also fluctuates greatly and the frequency is twice the grid frequency. The output power of the bus needs to be maintained constant basically, that is, the output current of the bus needs to be maintained stable basically, so that the bus capacitor needs to generate strong charging and discharging to maintain the current stability, which may cause the bus capacitor to heat, and reduce the service life of the bus capacitor.
Generally, in order to solve the above problems, a large-capacity bus capacitor needs to be selected, so as to improve the charging and discharging capability of the bus capacitor, and the cost is increased by selecting the large-capacity bus capacitor.
Therefore, a solution to the problem of the reduction of the lifetime of the bus capacitor due to the current fluctuation without increasing the additional cost is needed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes an operation control method.
A second aspect of the invention proposes an operation control system.
A third aspect of the present invention provides a compressor.
A fourth aspect of the present invention provides an air conditioner.
A fifth aspect of the invention proposes a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides an operation control method, which is applied to a power supply control circuit, where the power supply control circuit is configured to connect a power supply signal of a bus to an electrical load, and the power supply control circuit is provided with a power factor correction controller, a main control board, and an electrolytic capacitor, which are electrically connected, and the operation control method includes: detecting a power supply signal of a bus; determining a fundamental wave phase corresponding to the power supply signal, and determining a higher harmonic signal corresponding to the fundamental wave phase; and determining the duty ratio input to the power factor correction controller according to the higher harmonic signal.
In the technical scheme, a bus power supply signal of a power supply circuit provided with a PCF controller is detected in real time, a corresponding power supply fundamental wave phase is determined according to the bus power supply signal, a higher harmonic signal corresponding to a fundamental wave is further determined, the higher harmonic signal is injected into alternating current input to the bus through the power factor correction controller by changing the duty ratio of the power factor correction controller (namely a PFC controller), and the peak value of the waveform of the input current is cut off through the superposition effect of the higher harmonic so that the peak value of the bus current is correspondingly reduced. The technical scheme who this application is injectd has been used, through confirming the higher harmonic signal that corresponds according to the generating line power supply signal, the higher harmonic signal is injected to the fundamental wave signal through the duty cycle of control PFC controller, and then make the fundamental wave of the alternating current who inputs to the generating line reduce the amplitude under the superposition influence of higher harmonic, and then reduce the input current fluctuation of generating line, make the generating line electric capacity no longer need through strong charge-discharge in order to maintain current stability, consequently can effectual reduction generating line electric capacity calorific capacity, make can be at not changing large capacity generating line electric capacity, promote the reliability and the life of generating line electric capacity under the condition that does not increase hardware cost.
Specifically, for a general household air conditioner power supply circuit, a grid voltage input at an alternating current input side, i.e., a mains voltage, is a sine wave and can be represented by the following formula:
Uin＝Um×sin(ωt)；
wherein, UinFor ac measurement of fundamental wave signal of input voltage of electric network, UmTo the grid voltage amplitude, ω t represents the fundamental phase of the grid input voltage.
Under the action of the PFC controller, the ac side current will also follow the ac voltage to form a sine wave, which can be expressed by the following equation:
Iin＝Im×sin(ωt)；
wherein, IinFor an input current on the AC side, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Thus, the input power on the ac side can be expressed by:
wherein, PinIs the input power on the ac side.
It follows that the ac input power fluctuates widely with time and at a frequency twice the grid input frequency. Therefore, the bus capacitor is strongly charged and discharged, and the bus capacitor is seriously heated. In order to solve the problems, the invention injects a higher harmonic signal into a power supply signal on the AC side of the bus through the PFC module by controlling the duty ratio of the PFC controller, reduces the amplitude of a current signal flowing into the bus through the superposition of the higher harmonic and the AC side fundamental, and further reduces the input current fluctuation of the bus, so that the bus capacitor does not need to maintain the current stability through strong charging and discharging, and the heating of the bus capacitor is effectively reduced.
In addition, the operation control method in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, further, determining a higher harmonic signal corresponding to the fundamental wave phase specifically includes: determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the target harmonic amplitudes and the fundamental wave amplitude; and calculating to obtain a higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
In the technical scheme, the n-th harmonic signal required to be injected is confirmed according to the fundamental wave input at the alternating current side, and firstly, the fundamental wave amplitude of the power supply signal and the target harmonic amplitude I corresponding to the higher harmonic signal need to be determinedmCalculating the ratio of the target harmonic amplitude and the fundamental amplitude K1, and calculating the corresponding n-th harmonic signal by the following formula:
Iin＝K1×Im×sin(nωt)；
wherein, IinFor the nth harmonic signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, and satisfies the condition that K1 is greater than or equal to 0 and less than or equal to 1, n is the harmonic number of the higher harmonic, specifically a natural number greater than or equal to 2, and ω t is the fundamental phase.
In any of the above technical solutions, further, determining a duty ratio input to the power factor correction controller according to the higher harmonic signal specifically includes: determining a boost coefficient corresponding to the power supply signal; calculating the sum of the power supply signal and the higher harmonic signal to obtain a superposed signal; and calculating to obtain the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
In the technical scheme, the boost coefficient corresponding to the power supply signal can be determined according to the electric load, namely the running frequency of the compressor, and the boost coefficient can also be determined according to the bus voltage sampling value and the voltage amplitude of the accessed alternating current power supply signal. Simultaneously the superimposed signal is calculated according to the following formula:
Iin′＝Im×sin(ωt)+K1×Im×sin(nωt)；
wherein, Iin' for the superimposed signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Further, the duty cycle is calculated by the following formula:
where D is the duty cycle and K2 is the boost coefficient.
In any of the above technical solutions, further, when it is detected that the value of the duty ratio is a negative value, the duty ratio is set to 0.
In this technical solution, since the boost coefficient K2 may be less than 1 when the electrical load, i.e., the compressor, is operated at a low frequency, and the value of the duty ratio D calculated by the formula may be negative when K2 is less than 1, the duty ratio is set to 0.
A second aspect of the present invention provides an operation control system, which is suitable for a power supply control circuit, the power supply control circuit is configured to connect a power supply signal of a bus to an electrical load, and the power supply control circuit is provided with a power factor correction controller, a main control board and an electrolytic capacitor, which are electrically connected to each other, and the control system includes: the detection module is used for detecting a power supply signal of the bus; the control module is used for determining a fundamental wave phase corresponding to the power supply signal and determining a higher harmonic signal corresponding to the fundamental wave phase; and determining the duty ratio input to the power factor correction controller according to the higher harmonic signal.
In the technical scheme, a bus power supply signal of a power supply circuit provided with a PCF controller is detected in real time, a corresponding power supply fundamental wave phase is determined according to the bus power supply signal, a higher harmonic signal corresponding to a fundamental wave is further determined, the higher harmonic signal is injected into alternating current input to the bus through the power factor correction controller by changing the duty ratio of the power factor correction controller (namely a PFC controller), and the peak value of the waveform of the input current is cut off through the superposition effect of the higher harmonic so that the peak value of the bus current is correspondingly reduced. The technical scheme who this application is injectd has been used, through confirming the higher harmonic signal that corresponds according to the generating line power supply signal, the higher harmonic signal is injected to the fundamental wave signal through the duty cycle of control PFC controller, and then make the fundamental wave of the alternating current who inputs to the generating line reduce the amplitude under the superposition influence of higher harmonic, and then reduce the input current fluctuation of generating line, make the generating line electric capacity no longer need through strong charge-discharge in order to maintain current stability, consequently can effectual reduction generating line electric capacity calorific capacity, make can be at not changing large capacity generating line electric capacity, promote the reliability and the life of generating line electric capacity under the condition that does not increase hardware cost.
In the above technical solution, further, the control module is further configured to: determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the target harmonic amplitudes and the fundamental wave amplitude; and calculating to obtain a higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
In the technical scheme, the n-th harmonic signal required to be injected is confirmed according to the fundamental wave input at the alternating current side, and firstly, the fundamental wave amplitude of the power supply signal and the target harmonic amplitude I corresponding to the higher harmonic signal need to be determinedmCalculating the ratio K1 of the amplitude of the target harmonic wave and the amplitude of the fundamental wave, and calculating the corresponding n-th harmonic wave signal by the following formula:
Iin＝K1×Im×sin(nωt)；
wherein, IinFor the nth harmonic signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, and satisfies the condition that K1 is greater than or equal to 0 and less than or equal to 1, n is the harmonic number of the higher harmonic, specifically a natural number greater than or equal to 2, and ω t is the fundamental phase.
In any of the above technical solutions, further, the control module is further configured to: determining the duty ratio input to the power factor correction controller according to the higher harmonic signal, specifically comprising: determining a boost coefficient corresponding to the power supply signal; calculating the sum of the power supply signal and the higher harmonic signal to obtain a superposed signal; and calculating to obtain the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
In the technical scheme, the boost coefficient corresponding to the power supply signal can be determined according to the electric load, namely the running frequency of the compressor, and the boost coefficient can also be determined according to the bus voltage sampling value and the voltage amplitude of the accessed alternating current power supply signal. Simultaneously the superimposed signal is calculated according to the following formula:
Iin′＝Im×sin(ωt)+K1×Im×sin(nωt)；
wherein, Iin' for the superimposed signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Further, the duty cycle is calculated by the following formula:
where D is the duty cycle and K2 is the boost coefficient.
In any of the above technical solutions, further, when it is detected that the value of the duty ratio is a negative value, the duty ratio is set to 0.
In this technical solution, since the boost coefficient K2 may be less than 1 when the electrical load, i.e., the compressor, is operated at a low frequency, and the value of the duty ratio D calculated by the formula may be negative when K2 is less than 1, the duty ratio is set to 0.
A third aspect of the present invention provides a compressor comprising an operation control system as described in any one of the above claims, whereby the compressor comprises all the benefits of the operation control system as described in any one of the above claims.
A fourth aspect of the present invention provides an air conditioner, which includes the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions, and therefore, the air conditioner includes all the advantages of the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions.
A fifth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the operation control method as described in any one of the above claims, and therefore, includes all the advantageous effects of the operation control method as described in any one of the above claims.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of an operational control method according to one embodiment of the present invention;
FIG. 2 shows a schematic diagram of a power supply control circuit according to one embodiment of the invention;
FIG. 3.1 shows a schematic of a power control circuit bus input current and bus output current according to one embodiment of the invention;
FIG. 3.2 shows a schematic diagram of injecting a third harmonic signal in the fundamental of the supply signal on the AC side of the supply control circuit according to one embodiment of the invention;
FIG. 3.3 shows a schematic diagram of injecting a fifth harmonic signal in the fundamental of the supply signal on the AC side of the supply control circuit according to one embodiment of the invention;
FIG. 3.4 shows a schematic diagram of a bus input current and corresponding power factor correction controller duty cycle after injection of a third harmonic signal by a supply control circuit according to one embodiment of the present invention;
FIG. 4 shows a block diagram of an operation control system according to one embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The operation control method, the operation control system, the compressor, the air conditioner, and the computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 4.
In an embodiment of the first aspect of the present invention, as shown in fig. 1, there is provided an operation control method, adapted to a power supply control circuit, where the power supply control circuit is configured to connect a power supply signal of a bus to an electrical load, and a power factor correction controller, a main control board, and an electrolytic capacitor are electrically connected to the power supply control circuit, and the operation control method includes:
s102, detecting a power supply signal of a bus;
s104, determining a fundamental wave phase corresponding to the power supply signal, and determining a higher harmonic signal corresponding to the fundamental wave phase;
and S106, determining the duty ratio input to the power factor correction controller according to the higher harmonic signal.
In this embodiment, a bus power supply signal of a power supply circuit provided with a PCF controller is detected in real time, a corresponding power supply fundamental wave phase is determined from the bus power supply signal, and further a harmonic signal corresponding to the fundamental wave is determined, by changing the duty ratio of a power factor correction controller (i.e. a PFC controller) to inject a harmonic signal into an ac input current input to the bus by the power factor correction controller, the peak value of the input current waveform is "flattened" by the superposition effect of the harmonic, so that the bus current peak value corresponds to a drop. The technical scheme who this application is injectd has been used, through confirming the higher harmonic signal that corresponds according to the generating line power supply signal, the higher harmonic signal is injected to the fundamental wave signal through the duty cycle of control PFC controller, and then make the fundamental wave of the alternating current who inputs to the generating line reduce the amplitude under the superposition influence of higher harmonic, and then reduce the input current fluctuation of generating line, make the generating line electric capacity no longer need through strong charge-discharge in order to maintain current stability, consequently can effectual reduction generating line electric capacity calorific capacity, make can be at not changing large capacity generating line electric capacity, promote the reliability and the life of generating line electric capacity under the condition that does not increase hardware cost.
Specifically, for a general household air conditioner power supply circuit, such as the power supply control circuit shown in fig. 2, the grid voltage input at the ac input side, i.e. the mains voltage, is a sine wave and can be represented by the following formula:
Uin＝Um×sin(ωt)；
wherein, UinFor ac measurement of fundamental wave signal of input voltage of electric network, UmTo the grid voltage amplitude, ω t represents the fundamental phase of the grid input voltage.
Under the action of the PFC controller, the ac side current will also follow the ac voltage to form a sine wave, which can be expressed by the following equation:
Iin＝Im×sin(ωt)；
wherein, IinFor an input current on the AC side, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Thus, the input power on the ac side can be expressed by:
wherein, PinIs the input power on the ac side.
It follows that the ac input power fluctuates widely with time and at a frequency twice the grid input frequency. On the other hand, since the output current of the bus is a direct current without fluctuation, as shown in fig. 3.1, in order to compensate the current fluctuation, the bus capacitor is strongly charged and discharged, and further the bus capacitor is seriously heated. In order to solve the above problems, the present invention injects a higher harmonic signal into the power supply signal at the ac side of the bus through the PFC module by controlling the duty ratio of the PFC controller, and specifically may preferably inject a third harmonic signal as shown in fig. 3.2 or a fifth harmonic signal as shown in fig. 3.3, and reduces the amplitude of the current signal flowing into the bus by the superposition of the higher harmonic and the ac side fundamental wave, thereby reducing the input current fluctuation of the bus, so that the bus capacitor does not need to maintain the current stability through strong charging and discharging, and effectively reducing the heat generation of the bus capacitor. After determining the higher harmonic signal to be injected, the duty cycle to be input to the pfc controller is determined according to the higher harmonic signal, for example, after injecting the third harmonic signal, the corresponding duty cycle is specifically shown in fig. 3.4.
In an embodiment of the present invention, further, determining a higher harmonic signal corresponding to the fundamental wave phase includes: determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the target harmonic amplitudes and the fundamental wave amplitude; and calculating to obtain a higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
In this embodiment, the n-th harmonic signal to be injected is determined according to the fundamental wave input from the ac side, and it is first necessary to determine the fundamental wave amplitude of the power supply signal and the target harmonic amplitude I corresponding to the higher harmonic signalmCalculating the ratio of the target harmonic amplitude and the fundamental amplitude K1, and calculating the corresponding n-th harmonic signal by the following formula:
Iin＝K1×Im×sin(nωt)；
wherein, IinFor the nth harmonic signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, and satisfies the condition that K1 is greater than or equal to 0 and less than or equal to 1, n is the harmonic number of the higher harmonic, specifically a natural number greater than or equal to 2, and ω t is the fundamental phase.
Preferably, n is 3 and the higher harmonic is a third harmonic.
Preferably, n is 5 and the higher harmonic is a fifth harmonic.
In an embodiment of the present invention, further, determining a duty cycle of the input to the pfc controller according to the higher harmonic signal specifically includes: determining a boost coefficient corresponding to the power supply signal; calculating the sum of the power supply signal and the higher harmonic signal to obtain a superposed signal; and calculating to obtain the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
In this embodiment, the voltage boost coefficient corresponding to the power supply signal may be determined according to the electrical load, that is, the operating frequency of the compressor, or the voltage boost coefficient may be determined according to the sampled value of the bus voltage and the voltage amplitude of the ac power supply signal. Simultaneously the superimposed signal is calculated according to the following formula:
Iin′＝Im×sin(ωt)+K1×Im×sin(nωt)；
wherein, Iin' for the superimposed signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Further, the duty cycle is calculated by the following formula:
where D is the duty cycle and K2 is the boost coefficient.
In an embodiment of the present invention, further, the higher harmonic signal is a third harmonic signal, and the specific method for calculating and determining the duty ratio is as follows:
after injecting the third harmonic into the standard fundamental sine wave signal input to the ac side, the bus current input signal can be expressed by the following equation:
Iin＝Im×sin(ωt)+K1×Im×sin(3ωt)；
wherein, IinFor superimposed bus current input signals, ImK1 is the ratio of the amplitude of the injected third harmonic to the amplitude of the fundamental wave, and ω t represents the phase of the fundamental wave of the input current.
In order to inject the third harmonic signal expressed by the above formula into the standard base sine wave signal input from the ac side, the duty ratio D of the PFC controller should be:
wherein D is the duty cycle, IinFor superimposed bus current input signals, ImFor the amplitude of the fundamental wave of the input current, K1 is the ratio of the amplitude of the injected third harmonic to the amplitude of the fundamental wave, ω t represents the phase of the fundamental wave of the input current, and K2 is the boost coefficient.
In an embodiment of the present invention, further, when it is detected that the value of the duty ratio is a negative value, the duty ratio is set to 0.
In this embodiment, since the boost coefficient K2 may be less than 1 when the electrical load, i.e., the compressor, is operated at a lower frequency, and the value of the duty ratio D calculated by the formula may be negative when K2 is less than 1, the duty ratio is set to 0.
In an embodiment of the second aspect of the present invention, as shown in fig. 4, there is provided an operation control system 400, which is suitable for a power supply control circuit, the power supply control circuit is used for connecting a power supply signal of a bus to an electrical load, and the power supply control circuit is provided with a power factor correction controller, a main control board and an electrolytic capacitor which are electrically connected, and the control system 400 includes: a detection module 402, configured to detect a power supply signal of a bus; a control module 404, configured to determine a fundamental phase corresponding to the power supply signal, and determine a higher harmonic signal corresponding to the fundamental phase; and determining the duty ratio input to the power factor correction controller according to the higher harmonic signal.
In this embodiment, a bus power supply signal of a power supply circuit provided with a PCF controller is detected in real time, a corresponding power supply fundamental wave phase is determined from the bus power supply signal, and further a harmonic signal corresponding to the fundamental wave is determined, by changing the duty ratio of a power factor correction controller (i.e. a PFC controller) to inject a harmonic signal into an ac input current input to the bus by the power factor correction controller, the peak value of the input current waveform is "flattened" by the superposition effect of the harmonic, so that the bus current peak value corresponds to a drop. The technical scheme who this application is injectd has been used, through confirming the higher harmonic signal that corresponds according to the generating line power supply signal, the higher harmonic signal is injected to the fundamental wave signal through the duty cycle of control PFC controller, and then make the fundamental wave of the alternating current who inputs to the generating line reduce the amplitude under the superposition influence of higher harmonic, and then reduce the input current fluctuation of generating line, make the generating line electric capacity no longer need through strong charge-discharge in order to maintain current stability, consequently can effectual reduction generating line electric capacity calorific capacity, make can be at not changing large capacity generating line electric capacity, promote the reliability and the life of generating line electric capacity under the condition that does not increase hardware cost.
In an embodiment of the present invention, further, the control module is further configured to: determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the target harmonic amplitudes and the fundamental wave amplitude; and calculating to obtain a higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
In this embodiment, the n-th harmonic signal to be injected is determined according to the fundamental wave input from the ac side, and it is first necessary to determine the fundamental wave amplitude of the power supply signal and the target harmonic amplitude I corresponding to the higher harmonic signalmCalculating the ratio of the target harmonic amplitude and the fundamental amplitude K1, and calculating the corresponding n-th harmonic signal by the following formula:
Iin＝K1×Im×sin(nωt)；
wherein, IinFor the nth harmonic signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, and satisfies the condition that K1 is greater than or equal to 0 and less than or equal to 1, n is the harmonic number of the higher harmonic, specifically a natural number greater than or equal to 2, and ω t is the fundamental phase.
In an embodiment of the present invention, further, the control module is further configured to: determining the duty ratio input to the power factor correction controller according to the higher harmonic signal, specifically comprising: determining a boost coefficient corresponding to the power supply signal; calculating the sum of the power supply signal and the higher harmonic signal to obtain a superposed signal; and calculating to obtain the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
In this embodiment, the voltage boost coefficient corresponding to the power supply signal may be determined according to the electrical load, that is, the operating frequency of the compressor, or the voltage boost coefficient may be determined according to the sampled value of the bus voltage and the voltage amplitude of the ac power supply signal. Simultaneously the superimposed signal is calculated according to the following formula:
Iin′＝Im×sin(ωt)+K1×Im×sin(3ωt)；
wherein, Iin' for the superimposed signal, K1 is the ratio of the target harmonic amplitude and the fundamental amplitude, ImTo the input current amplitude, ω t represents the fundamental phase of the input current.
Further, the duty cycle is calculated by the following formula:
where D is the duty cycle and K2 is the boost coefficient.
In an embodiment of the present invention, further, when it is detected that the value of the duty ratio is a negative value, the duty ratio is set to 0.
In this embodiment, since the boost coefficient K2 may be less than 1 when the electrical load, i.e., the compressor, is operated at a lower frequency, and the value of the duty ratio D calculated by the formula may be negative when K2 is less than 1, the duty ratio is set to 0.
In an embodiment of the third aspect of the present invention there is provided a compressor including an operation control system as described in any one of the embodiments above, whereby the compressor includes all the benefits of the operation control system as described in any one of the embodiments above.
In an embodiment of the fourth aspect of the present invention, there is provided an air conditioner comprising an operation control system as described in any one of the above embodiments and/or a compressor as described in any one of the above embodiments, and therefore comprising all the benefits of the operation control system as described in any one of the above embodiments and/or the compressor as described in any one of the above embodiments.
In an embodiment of the fifth aspect of the present invention, there is provided a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the operation control method as described in any one of the above embodiments, and therefore the computer-readable storage medium includes all the advantageous effects of the operation control method as described in any one of the above embodiments.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made 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 protection scope of the present invention.
Claims (9)
1. An operation control method is suitable for a power supply control circuit, the power supply control circuit is used for connecting a power supply signal of a bus into an electrical load, and a power factor correction controller, a main control board and an electrolytic capacitor which are electrically connected are arranged in the power supply control circuit, and the operation control method is characterized by comprising the following steps of:
detecting a power supply signal of the bus;
determining a fundamental wave phase corresponding to the power supply signal and a fundamental wave amplitude corresponding to the power supply signal, and determining a higher harmonic signal corresponding to the fundamental wave phase;
determining a duty ratio input to the power factor correction controller according to the higher harmonic signal so as to inject the higher harmonic signal into the input current input to the bus through the power factor correction controller;
the determining the duty ratio input to the power factor correction controller according to the higher harmonic signal specifically includes:
determining a boost coefficient corresponding to the power supply signal according to a bus voltage sampling value and the voltage amplitude of the accessed alternating current power supply signal;
calculating the sum of the power supply signal and the higher harmonic signal to obtain a superimposed signal;
and calculating the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
2. The operation control method according to claim 1, wherein the determining of the higher harmonic signal corresponding to the fundamental phase is specifically:
determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the fundamental wave amplitude to the target harmonic amplitude;
and calculating to obtain the higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
3. The operation control method according to claim 1, characterized in that the duty ratio is set to 0 when it is detected that the value of the duty ratio is a negative value.
4. An operation control system is suitable for a power supply control circuit, the power supply control circuit is used for connecting a power supply signal of a bus into an electrical load, a power factor correction controller, a main control board and an electrolytic capacitor which are electrically connected are arranged in the power supply control circuit, and the operation control system is characterized by comprising:
the detection module is used for detecting a power supply signal of the bus;
the control module is used for determining a fundamental wave phase corresponding to the power supply signal and a fundamental wave amplitude corresponding to the power supply signal, and determining a higher harmonic signal corresponding to the fundamental wave phase; and
determining a duty ratio input to the power factor correction controller according to the higher harmonic signal so as to inject the higher harmonic signal into the input current input to the bus through the power factor correction controller;
the control module is further configured to:
determining a boost coefficient corresponding to the power supply signal according to a bus voltage sampling value and the voltage amplitude of the accessed alternating current power supply signal; and
calculating the sum of the power supply signal and the higher harmonic signal to obtain a superimposed signal;
and calculating the duty ratio according to the superposed signal, the boosting coefficient and the fundamental wave amplitude.
5. The operational control system of claim 4, wherein the control module is further configured to:
determining a fundamental wave amplitude corresponding to the power supply signal and a target harmonic amplitude corresponding to the higher harmonic signal, and calculating a ratio of the fundamental wave amplitude to the target harmonic amplitude;
and calculating to obtain the higher harmonic signal according to the ratio, the fundamental amplitude and the fundamental phase.
6. The operational control system of claim 4, wherein the control module is further configured to:
and when the numerical value of the duty ratio is detected to be a negative value, setting the duty ratio to be 0.
7. A compressor, characterized in that it comprises an operation control system as claimed in any one of claims 4 to 6.
8. An air conditioner characterized by comprising the operation control system according to any one of claims 4 to 6; and/or
The compressor of claim 7.
9. A computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing an operation control method according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811458686.3A CN111256275B (en) | 2018-11-30 | 2018-11-30 | Operation control method and system, compressor and air conditioner |
| PCT/CN2019/101695 WO2020107956A1 (en) | 2018-11-30 | 2019-08-21 | Operation control method and system, and compressor, air conditioner and readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811458686.3A CN111256275B (en) | 2018-11-30 | 2018-11-30 | Operation control method and system, compressor and air conditioner |
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| CN111256275B true CN111256275B (en) | 2021-09-21 |
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| CN113932396B (en) * | 2020-07-13 | 2023-08-04 | 海信空调有限公司 | Air conditioner and control method |
| CN113507243B (en) * | 2021-07-20 | 2022-08-30 | 燕山大学 | High-performance operation control method and system of permanent magnet brushless motor based on harmonic decomposition |
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| CN103490601A (en) * | 2013-09-17 | 2014-01-01 | 南京理工大学 | DCM Boost PFC converter for low-output voltage ripples |
| CN105515354B (en) * | 2016-01-22 | 2018-12-07 | 珠海格力电器股份有限公司 | Method for controlling a compressor, device and system |
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