CN113625052A - Phase detection method and system for bus voltage ripple of air conditioner compressor - Google Patents
Phase detection method and system for bus voltage ripple of air conditioner compressor Download PDFInfo
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Abstract
The invention provides a phase detection method and a system for bus voltage ripples of an air conditioner compressor, which are used for detection after PFC power factor correction is started, and the detection method comprises the following steps: acquiring a current instantaneous value Iac of an alternating current power supply of a compressor; calculating a current peak value Ipeak of the alternating current power supply; set comparative current ideect = Ipeak
Theta, wherein the value range of theta is (0, pi/2); when Iac is larger than or equal to Idetect, outputting the phase of the alternating current power supply at the moment to be theta; the bus voltage ripple phase Ψ at this time is calculated from the phase θ of the ac power supply. According to the invention, a phase detection hardware circuit is not required, the instantaneous value of the alternating current power supply is detected only by using the current detection circuit of the existing alternating current power supply, and then the phase of the alternating current power supply and the phase of the voltage ripple of the direct current bus can be detected and tracked through software. The invention has simple algorithm, occupies less mcu resources, saves the resource overhead of a chip and is easy to implement.
Description
Technical Field
The invention relates to the technical field of air conditioner compressor control, in particular to a phase detection method and system for bus voltage ripples of an air conditioner compressor.
Background
The bus voltage of the compressor in the frequency conversion field is the direct current voltage at the back end of the pfc. During the operation of the compressor, the voltage of the direct current bus has 2 times of the fluctuation of the alternating current input frequency. Fluctuations in the bus voltage can affect fluctuations in the compressor current. Fluctuations in compressor current can cause an overcurrent shutdown, particularly under heavy loading conditions. In order to reduce the fluctuation of the compressor current due to the fluctuation of the bus voltage, the driving voltage of the compressor can be compensated by separating the current fluctuation component due to the fluctuation of the bus voltage from the compressor currents Id and Iq. As shown in fig. 1, the control principle is illustrated by taking d-axis as an example, and in the bus-ripple compressor current suppression module in fig. 1, it is necessary to track the phase of the bus-voltage ripple. The relationship between the ac current phase and the bus voltage ripple phase is as shown in fig. 2, and the fluctuation frequency of the bus voltage is 2 times of the ac current frequency, so that the phase of the bus voltage ripple can be obtained by detecting the phase of the ac current and using the detected phase as a reference.
In a conventional PFC control scheme, phase detection of an ac power supply is implemented by a hardware circuit, and as well-known contents, a hardware principle is not described in detail.
However, the phase detection of the ac power source is realized by a hardware circuit, which inevitably increases the cost and the circuit board size. Therefore, the phase detection method of the hardware detection circuit without the alternating current phase becomes a research trend, realizes detection and tracking of the alternating current phase, further realizes detection and tracking of the bus voltage ripple phase, and has important significance.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a phase detection method and a phase detection system for bus voltage ripple of an air conditioner compressor, which solve the technical problems of high cost and large volume of the existing air conditioner that the phase of the bus voltage ripple is detected by a hardware circuit.
The invention provides a phase detection method and system for bus voltage ripples of an air conditioner compressor.
A phase detection method for bus voltage ripple of an air conditioner compressor detects the phase after PFC power factor correction is started, and the detection method comprises the following steps:
acquiring a current instantaneous value Iac of the compressor alternating current power supply;
calculating a current peak value Ipeak of the alternating current power supply;
setting a comparison current Idetect as Ipeak sin theta, wherein theta is in a value range of (0, pi/2);
when Iac is larger than or equal to Idetect, outputting the phase of the alternating current power supply at the moment to be theta;
and calculating the bus voltage ripple phase psi at the moment according to the phase theta of the alternating current power supply.
According to the phase detection method for the bus voltage ripple of the air conditioner compressor, the phase Ψ of the bus voltage ripple is 2 θ + phase _ shift, where phase _ shift is a phase difference between the current phase of the ac power supply and the bus ripple voltage.
In the method for detecting the phase of the bus voltage ripple of the air conditioner compressor, the method for calculating the current peak value Ipeak of the ac power supply comprises the following steps:
calculating a root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac;
the peak value Ipeak of the alternating current I _ ac _ rms √ 2 is calculated from I _ ac _ rms.
According to the method for detecting the phase of the bus voltage ripple of the compressor of the air conditioner, when Iac is larger than or equal to Idetect and continues for a set time t, the phase of the AC power supply at the moment is output to be theta, wherein the set time t is a predetermined value.
According to the phase detection method for the bus voltage ripple of the air conditioner compressor, in each detection calculation period, the phase α of the bus ripple voltage is updated to Ψ + T2 π/Tac, where Tac is the period of the steamed bread wave rectified by the alternating current power supply; and T is a detection calculation period.
A system for phase detection of air conditioner compressor bus voltage ripple, the system comprising:
the current instantaneous value acquisition module of the alternating current power supply is used for acquiring a current instantaneous value Iac of the alternating current power supply of the compressor;
the current peak value calculating module is used for calculating a current peak value Ipeak of the alternating current power supply;
the comparison module is used for setting comparison current Idetect ═ Ipeak ═ sin theta, wherein the value range of theta is (0, pi/2); the phase output unit is used for outputting the phase of the alternating current power supply to be theta when the Iac is larger than or equal to the Idetect;
and the bus voltage ripple phase calculation module is used for calculating the bus voltage ripple phase Ψ according to the phase θ of the alternating current power supply.
In the phase detection system for bus voltage ripple of the compressor of the air conditioner, the bus voltage ripple phase calculation module calculates a phase Ψ of the bus voltage ripple at this time to be 2 θ + phase _ shift, where phase _ shift is a phase difference between a current phase of the ac power supply and the bus ripple voltage.
According to the phase detection system for the bus voltage ripple of the air conditioner compressor, the current peak value calculation module is used for calculating the root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac; the peak value Ipeak of the alternating current I _ ac _ rms √ 2 is calculated from I _ ac _ rms.
According to the phase detection system for the bus voltage ripple of the compressor of the air conditioner, the comparison module is used for outputting the phase of the alternating current power supply to be theta when the Iac is larger than or equal to the Idetect and continues for the set time t, wherein the set time t is a predetermined value.
The system for detecting the phase of the bus voltage ripple of the compressor of the air conditioner comprises an updating module, a phase detecting module and a phase detecting module, wherein the updating module is used for updating the phase alpha of the bus ripple voltage in each detection calculation period, namely psi + T2 pi/Tac, and Tac is the period of the steamed bread wave rectified by the alternating-current power supply; and T is a detection calculation period.
Compared with the prior art, the invention has the advantages and positive effects that: the invention relates to a phase detection method of bus voltage ripple of an air conditioner compressor, which detects the phase after PFC power factor correction is started, and the detection method comprises the following steps: acquiring a current instantaneous value Iac of an alternating current power supply of a compressor; calculating a current peak value Ipeak of the alternating current power supply; setting a comparison current Idetect as Ipeak sin theta, wherein theta is in a value range of (0, pi/2); when Iac is larger than or equal to Idetect, outputting the phase of the alternating current power supply at the moment to be theta; the bus voltage ripple phase Ψ at this time is calculated from the phase θ of the ac power supply. According to the invention, a phase detection hardware circuit is not required, the instantaneous value of the alternating current power supply is detected only by using the current detection circuit of the existing alternating current power supply, and then the phase of the alternating current power supply and the phase of the voltage ripple of the direct current bus can be detected and tracked through software. The invention has simple algorithm, occupies less mcu resources, saves the resource overhead of a chip and is easy to implement.
The invention discloses a phase detection system for bus voltage ripples of an air conditioner compressor. The current instantaneous value acquisition module of the alternating current power supply is used for acquiring a current instantaneous value Iac of the alternating current power supply of the compressor; the current peak value calculating module is used for calculating a current peak value Ipeak of the alternating current power supply; the comparison module is used for setting comparison current Idetect ═ Ipeak × sin theta, wherein the value range of theta is (0, pi/2); the comparison module is also used for outputting the phase of the alternating current power supply to be theta when the Iac is larger than or equal to the Idetect; and the bus voltage ripple phase calculation module is used for calculating the bus voltage ripple phase Ψ according to the phase θ of the alternating current power supply. According to the invention, a phase detection hardware circuit is not required, the instantaneous value of the alternating current power supply is detected only by using the current detection circuit of the existing alternating current power supply, and then the phase of the alternating current power supply and the phase of the voltage ripple of the direct current bus can be detected and tracked through software. The invention has simple algorithm, occupies less mcu resources, saves the resource overhead of a chip and is easy to implement.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a compressor current Id for compensating a driving voltage of a compressor by separating a current fluctuation component due to a bus voltage fluctuation.
Fig. 2 is a schematic diagram of the relationship between the ac power supply current phase and the bus voltage ripple phase.
Fig. 3 is a waveform diagram of an ac power supply current.
FIG. 4 is a schematic diagram of the waveform of the AC power source and the waveform of the rectified steamed bread wave.
Fig. 5 is a flow chart of an embodiment of the present invention.
FIG. 6 is a block diagram of suppression of compensation voltage using bus ripple current.
Fig. 7 is a schematic block diagram of a specific embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. 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 order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The inverter compressor of the air conditioner generally adopts an alternating current power supply to convert into direct current voltage and then supplies power, the inverter compressor has PFC power factor correction, the direct current voltage at the rear end of the PFC is bus voltage, and the direct current bus voltage has fluctuation which is 2 times of alternating current input frequency in the operation process of the compressor. Fluctuations in the bus voltage can affect fluctuations in the compressor current. Fluctuations in compressor current can cause an overcurrent shutdown, particularly under heavy loading conditions. In order to reduce the fluctuation of the compressor current due to the fluctuation of the bus voltage, the driving voltage of the compressor can be compensated by separating the current fluctuation component due to the fluctuation of the bus voltage from the compressor currents Id and Iq. In the control method, the phase of the bus voltage ripple needs to be tracked, and this embodiment provides a method and a system for detecting the phase of the bus voltage ripple based on software, which only needs to detect the instantaneous value of the ac power supply by using the current detection circuit of the existing ac power supply without adding any hardware, and then can detect and track the phase of the ac power supply and the phase of the dc bus voltage ripple by software.
The following describes a method for detecting the phase of the bus voltage ripple of the compressor of the air conditioner in this embodiment:
a phase detection method for bus voltage ripple of an air conditioner compressor is used for detecting the phase of the bus voltage ripple after PFC power factor correction is started, and comprises the following steps:
and acquiring a current instantaneous value Iac of the compressor alternating current power supply.
The instantaneous current value Iac of the compressor ac power supply can be detected by an ac power supply current detection circuit in the existing hardware circuit.
The peak value Ipeak of the current of the ac power source is calculated as shown in fig. 3.
And calculating the current peak value Ipeak of the AC power supply according to the current instantaneous value Iac of the AC power supply of the compressor.
Specifically, the method for calculating the current peak value Ipeak of the alternating current power supply comprises the following steps:
calculating a root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac;
the peak value Ipeak of the alternating current I _ ac _ rms √ 2 is calculated from I _ ac _ rms.
The rms value I _ ac _ rms of the power current, that is, the effective value of the instantaneous current value Iac, may be obtained by filtering in the prior art or by PFC power factor correction, and therefore, the rms value I _ ac _ rms of the power current may be obtained by the prior art, and will not be described herein again.
The comparison current Idetect is set as illustrated in fig. 3.
Wherein, the value range of theta is (0, pi/2).
And when the Iac is larger than or equal to the Idetect, outputting the phase of the alternating current power supply at the moment to be theta.
Because the current has certain fluctuation, in order to improve the detection accuracy and avoid erroneous judgment, in this embodiment, it is preferable that when Iac is greater than or equal to Idetect and lasts for the set time t, the phase of the ac power at that time is output as θ.
The set time t is a predetermined value.
T in the present embodiment is preferably any value of 50 to 200 us.
The bus voltage ripple phase Ψ at this time is calculated from the phase θ of the ac power supply.
Specifically, the bus voltage ripple phase Ψ is 2 θ + phase _ shift.
Phase _ shift is a phase difference between a current phase of the alternating current power supply and a bus ripple voltage.
Phase _ shift can be estimated to be pi based on the conservation of input and output power.
The scheme realizes the detection of the ripple phase of the bus voltage.
In order to further track the ripple phase of the bus voltage, the present embodiment updates the ripple phase of the bus voltage in each detection and calculation cycle.
Specifically, the bus ripple voltage phase α is updated every detection calculation cycle by Ψ + T2 pi/Tac.
Wherein, Tac is the period of the steamed bread wave rectified by the ac power supply, as shown in fig. 4. In this example, Tac was 0.01 s.
T is a detection calculation period, which can be set according to the actual detection precision requirement, and in this embodiment, the detection calculation period T is 0.00005 s.
The scheme realizes the tracking of the ripple phase of the bus voltage.
It should be noted that the above scheme must be implemented after the PFC is turned on, because the PFC is not turned on and the supply current is non-sinusoidal, which may cause the initial phase of Ψ to be incorrect.
As shown in fig. 5, the method for detecting the phase of the bus voltage ripple of the air conditioner compressor according to the embodiment performs the phase detection of the bus voltage ripple after the PFC power factor correction is turned on, and includes the following steps:
and S1, acquiring the current instantaneous value Iac of the compressor AC power supply.
The instantaneous current value Iac of the compressor ac power supply can be detected by an ac power supply current detection circuit in the existing hardware circuit.
And S2, calculating the current peak value Ipeak of the AC power supply according to the current instantaneous value Iac of the AC power supply of the compressor.
Specifically, the method for calculating the current peak value Ipeak of the alternating current power supply comprises the following steps:
calculating a root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac;
the peak value Ipeak of the alternating current I _ ac _ rms √ 2 is calculated from I _ ac _ rms.
The rms value I _ ac _ rms of the power current, that is, the effective value of the instantaneous current value Iac, may be obtained by filtering in the prior art or by PFC power factor correction, and therefore, the rms value I _ ac _ rms of the power current may be obtained by the prior art, and will not be described herein again.
S3, setting the comparative current Idetect ═ Ipeak × sin θ, where θ is in the range of (0, pi/2).
S4, judging that Iac is larger than or equal to Idetect and continuing to set time t, if so, entering step S5, otherwise, entering step S4.
The set time t is a predetermined value.
T in the present embodiment is preferably any value of 50 to 200 us.
S5, the phase of the ac power at this time is output as θ.
And S6, calculating the bus voltage ripple phase psi according to the phase theta of the alternating current power supply.
Specifically, the bus voltage ripple phase Ψ is 2 θ + phase _ shift.
Phase _ shift is a phase difference between a current phase of the alternating current power supply and a bus ripple voltage.
Phase _ shift can be estimated to be pi based on the conservation of input and output power.
And S7, updating the bus ripple voltage phase in each detection calculation period.
Specifically, the bus ripple voltage phase α is updated every detection calculation cycle by Ψ + T2 pi/Tac.
Wherein, Tac is the period of the steamed bread wave rectified by the ac power supply, as shown in fig. 4. In this example, Tac was 0.01 s.
T is a detection calculation period, which can be set according to the actual detection precision requirement, and in this embodiment, the detection calculation period T is 0.00005 s.
After the ripple phase of the bus voltage is obtained, the driving voltage of the compressor can be compensated by separating the current ripple component caused by the ripple of the bus voltage from the compressor currents Id and Iq.
Specifically, as shown in fig. 6, the following description will be made by taking as an example the case where a current fluctuation component due to a fluctuation in the bus voltage is separated from the compressor current Id to compensate the drive voltage of the compressor:
and performing Fourier series expansion on the Id to obtain a function expression of the d-axis current about the bus voltage phase alpha, multiplying the function expression with cos alpha and-sin alpha respectively, subtracting the function expression from the target value 0, filtering the function expression by an integrator, performing inverse Fourier transform, multiplying the function expression with cos alpha and-sin alpha respectively, and adding the result to obtain a compensation instruction of the d-axis voltage.
As shown in fig. 7, the present embodiment further provides a phase detection system for bus voltage ripple of an air conditioner compressor, which includes a current instantaneous value obtaining module, a current peak value calculating module, a comparing module, a bus voltage ripple phase calculating module, and a bus voltage ripple phase updating module of an ac power supply.
The following describes each module in detail:
the current instantaneous value acquisition module of the alternating current power supply is used for acquiring a current instantaneous value Iac of the alternating current power supply of the compressor.
The instantaneous current value Iac of the compressor ac power supply can be detected by an ac power supply current detection circuit in the existing hardware circuit.
The current peak value calculating module is used for calculating a current peak value Ipeak of the alternating current power supply.
The current peak value calculating module calculates a current peak value Ipeak of the AC power supply according to the current instantaneous value Iac of the AC power supply of the compressor.
Specifically, the method for calculating the current peak value Ipeak of the alternating current power supply by the current peak value calculation module comprises the following steps:
calculating a root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac;
the peak value Ipeak of the alternating current I _ ac _ rms √ 2 is calculated from I _ ac _ rms.
The rms value I _ ac _ rms of the power current, that is, the effective value of the instantaneous current value Iac, may be obtained by filtering in the prior art or by PFC power factor correction, and therefore, the rms value I _ ac _ rms of the power current may be obtained by the prior art, and will not be described herein again.
The comparison module is used for setting a comparison current Idetect ═ Ipeak ═ sin theta, wherein theta is in a value range of (0, pi/2).
The comparison module is also used for outputting the phase of the alternating current power supply to be theta when the Iac is larger than or equal to the Idetect.
Because the current has certain fluctuation, in order to improve the detection accuracy and avoid erroneous judgment, the comparing module of this embodiment preferably outputs the phase of the ac power at this time to be θ when Iac is greater than or equal to Idetect and continues to set time t.
The set time t is a predetermined value.
T in the present embodiment is preferably any value of 50 to 200 us.
And the bus voltage ripple phase calculation module is used for calculating the bus voltage ripple phase Ψ according to the phase θ of the alternating current power supply.
Specifically, the bus voltage ripple phase calculated by the bus voltage ripple phase calculation module is 2 θ + phase _ shift.
Phase _ shift is a phase difference between a current phase of the alternating current power supply and a bus ripple voltage.
Phase _ shift can be estimated to be pi based on the conservation of input and output power.
The scheme realizes the detection of the ripple phase of the bus voltage.
In order to further track the bus voltage ripple phase, the bus ripple voltage phase is updated in each detection calculation period in this embodiment, and the embodiment further includes a bus ripple voltage phase updating module.
And the bus ripple voltage phase updating module is used for updating the bus ripple voltage phase alpha to psi + T2 pi/Tac in each detection calculation period.
Wherein, Tac is the period of the steamed bread wave rectified by the ac power supply, as shown in fig. 4. In this example, Tac was 0.01 s.
T is a detection calculation period, which can be set according to the actual detection precision requirement, and in this embodiment, the detection calculation period T is 0.00005 s.
The scheme realizes the tracking of the ripple phase of the bus voltage.
It should be noted that the above scheme must be implemented after the PFC is turned on, because the PFC is not turned on and the supply current is non-sinusoidal, which may cause the initial phase of Ψ to be incorrect.
The principle of this embodiment is as follows: the comparison current Idetect is set to the corresponding current at the phase θ, and thus, when the detected current is equal to Idetect, that is, the phase value of the current is θ.
Therefore, in this embodiment, a phase detection hardware circuit is not required, and only the current detection circuit of the ac power supply is required to detect the instantaneous value of the ac power supply, and then the phase of the ac power supply and the phase of the dc bus voltage ripple can be detected and tracked through software. The algorithm of the embodiment is simple, the occupied mcu resources are few, the resource overhead of a chip is saved, and the implementation is easy.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A phase detection method for bus voltage ripple of an air conditioner compressor is characterized in that detection is carried out after PFC power factor correction is started, and the detection method comprises the following steps:
acquiring a current instantaneous value Iac of the compressor alternating current power supply;
calculating a current peak value Ipeak of the alternating current power supply;
set comparative current ideect = Ipeak
Theta, wherein the value range of theta is (0, pi/2);
when Iac is larger than or equal to Idetect, outputting the phase of the alternating current power supply at the moment to be theta;
and calculating the bus voltage ripple phase psi at the moment according to the phase theta of the alternating current power supply.
2. The method for detecting the phase of the bus voltage ripple of the air conditioner compressor according to claim 1, wherein the bus voltage ripple phase Ψ =2 θ + phase _ shift, and phase _ shift is a phase difference between a current phase of the ac power supply and the bus ripple voltage.
3. The method for detecting the phase of the bus voltage ripple of the air conditioner compressor according to claim 1, wherein the method for calculating the current peak value Ipeak of the ac power supply comprises:
calculating a root mean square value I _ ac _ rms of the power supply current according to the current instantaneous value Iac;
the peak value Ipeak = I _ ac _ rms √ 2 of the alternating current is calculated from I _ ac _ rms.
4. The method as claimed in claim 1, wherein the phase of the ac power is θ when Iac is greater than or equal to ideect and continues for a predetermined time t, wherein the predetermined time t is a predetermined value.
5. The method for detecting the phase of the bus voltage ripple of the air conditioner compressor according to any one of claims 1 to 4, wherein the bus ripple voltage phase α = Ψ + T × 2 π/Tac is updated every detection calculation cycle, wherein Tac is the cycle of the steamed bread wave rectified by the AC power supply; and T is a detection calculation period.
6. A phase detection system for bus voltage ripple of an air conditioner compressor, the system comprising:
the current instantaneous value acquisition module of the alternating current power supply is used for acquiring a current instantaneous value Iac of the alternating current power supply of the compressor;
the current peak value calculating module is used for calculating a current peak value Ipeak of the alternating current power supply;
a comparison module for setting a comparison current Idetect = Ipeak
Theta, wherein the value range of theta is (0, pi/2); the phase output unit is used for outputting the phase of the alternating current power supply to be theta when the Iac is larger than or equal to the Idetect;
and the bus voltage ripple phase calculation module is used for calculating the bus voltage ripple phase Ψ according to the phase θ of the alternating current power supply.
7. The system for detecting the phase of the bus voltage ripple of the air conditioner compressor according to claim 6, wherein the bus voltage ripple phase calculation module calculates a bus voltage ripple phase Ψ =2 θ + phase _ shift at the time, wherein phase _ shift is a phase difference between a current phase of the ac power supply and the bus ripple voltage.
8. The system for detecting the phase of the busbar voltage ripple of the air conditioner compressor according to claim 6, wherein the current peak value calculating module is configured to calculate a root mean square value I _ ac _ rms of a power current according to the current instantaneous value Iac; the peak value Ipeak = I _ ac _ rms √ 2 of the alternating current is calculated from I _ ac _ rms.
9. The system for detecting the phase of the bus voltage ripple of the air conditioner compressor according to claim 6, wherein the comparing module is configured to output the phase of the ac power at the time as θ when Iac is greater than or equal to ideect and continues for a set time t, wherein the set time t is a predetermined value.
10. The system for detecting the phase of the bus voltage ripple of the air conditioner compressor according to any one of claims 6 to 9, wherein the system comprises an updating module for updating the bus ripple voltage phase α = Ψ + T × 2 π/Tac with each detection calculation cycle, wherein Tac is a cycle of the steamed bread wave rectified by the ac power supply; and T is a detection calculation period.
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| CN202111006164.1A CN113625052A (en) | 2021-08-30 | 2021-08-30 | Phase detection method and system for bus voltage ripple of air conditioner compressor |
| PCT/CN2022/115020 WO2023030179A1 (en) | 2021-08-30 | 2022-08-26 | Phase measurement method and system for bus voltage ripple of air conditioner compressor |
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| CN202111006164.1A CN113625052A (en) | 2021-08-30 | 2021-08-30 | Phase detection method and system for bus voltage ripple of air conditioner compressor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370727A (en) * | 2021-12-28 | 2022-04-19 | 青岛海尔空调电子有限公司 | Compressor control method and device and air conditioner |
| WO2023030179A1 (en) * | 2021-08-30 | 2023-03-09 | 青岛海尔空调器有限总公司 | Phase measurement method and system for bus voltage ripple of air conditioner compressor |
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| CN113162395B (en) * | 2021-05-10 | 2023-02-28 | 海信空调有限公司 | PFC (power factor correction) control method and device of variable frequency air conditioner and variable frequency air conditioner |
| CN113625052A (en) * | 2021-08-30 | 2021-11-09 | 青岛海尔空调器有限总公司 | Phase detection method and system for bus voltage ripple of air conditioner compressor |
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| WO2023030179A1 (en) | 2023-03-09 |
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