CN114337437B - Control method of variable frequency air conditioner, variable frequency air conditioner and computer storage medium - Google Patents
Control method of variable frequency air conditioner, variable frequency air conditioner and computer storage medium Download PDFInfo
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Abstract
The invention discloses a control method of a variable frequency air conditioner, the variable frequency air conditioner and a computer storage medium, wherein the control method of the variable frequency air conditioner comprises the following steps: obtaining a duty cycle compensation value according to the obtained running current value of the compressor, and obtaining a control parameter compensation value of the compressor according to the obtained input alternating voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor; obtaining a target duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty ratio compensation value; obtaining target control parameters of the compressor according to the control parameter compensation value of the compressor, the rotating speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor; the PFC circuit is controlled according to a target duty cycle, and the compressor is controlled according to a target control parameter of the compressor. The control method can achieve the purpose of inhibiting the fluctuation of the voltage of the direct current bus and improve the use reliability.
Description
Technical Field
The present invention relates to the field of air conditioners, and in particular, to a control method of a variable frequency air conditioner, and a computer storage medium.
Background
In the related art, for a variable frequency air conditioner, the input end of the variable frequency controller is usually single-phase alternating current, the compressor load at the output end is a periodic fluctuation load, and both the input end and the output end can cause the fluctuation of the direct current bus voltage value of the variable frequency controller, so that the service life of a bus capacitor is reduced, and the reliability is reduced.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a control method of a variable frequency air conditioner, by which the purpose of suppressing the fluctuation of the dc bus voltage can be achieved and the reliability of use can be improved.
Another object of the present invention is to provide an air conditioner.
It is still another object of the present invention to provide a computer storage medium.
The fourth object of the present invention is to provide an air conditioner.
In order to solve the above problems, an embodiment of a first aspect of the present invention provides a control method of a variable frequency air conditioner, the variable frequency air conditioner including a PFC circuit and a compressor, the control method including: obtaining a direct current bus voltage value, an actual current value of a PFC circuit, an input alternating current voltage value, an operation current value of a compressor, a rotating speed value of the compressor, a rotor electric angle position value and a three-phase current value of the compressor; obtaining a duty cycle compensation value according to the running current value of the compressor, and obtaining a control parameter compensation value of the compressor according to the input alternating voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor; obtaining a target duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty ratio compensation value; obtaining a target control parameter of the compressor according to the control parameter compensation value of the compressor, the rotating speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor; and controlling the PFC circuit according to the target duty ratio, and controlling the compressor according to target control parameters of the compressor.
According to the control method of the variable frequency air conditioner, since the direct current bus voltage is influenced by the input of the power grid side and the output of the inverter side, the influence of the load fluctuation of the compressor is considered, the duty cycle compensation value is obtained through the operation current value of the compressor, the target duty cycle is obtained according to the duty cycle compensation value, the direct current bus voltage value, the actual current value of the PFC circuit and the input alternating current voltage value, and therefore when the PFC circuit is controlled, the duty cycle of the PFC circuit is compensated through the duty cycle compensation value to obtain the target duty cycle, and therefore when the PFC circuit is controlled through the target duty cycle, the PFC circuit can output a stable direct current bus voltage value, effectively suppresses direct current bus voltage fluctuation caused by the load fluctuation of the compressor, meanwhile, the control parameter compensation value of the compressor is obtained through the input alternating current voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor, and the target control parameter of the compressor is obtained through the control parameter compensation value, the rotating speed value of the rotor electric angle position value and the three-phase current value, namely, when the control parameter compensation value is used as the control parameter compensation value, the control parameter compensation value is used as the power grid side, the control parameter compensation value, the direct current bus voltage value is used for generating the control parameter compensation value, and the control parameter compensation value is used for generating the control parameter, and the direct current bus voltage fluctuation is controlled by the power grid side power grid frequency fluctuation, and the power grid frequency fluctuation is effectively suppressed, and the power grid frequency fluctuation is generated, and the power grid frequency fluctuation is controlled, and the power grid frequency fluctuation is generated, and the control current is high, and the control current output is high.
In some embodiments, obtaining a duty cycle compensation value from an operating current value of the compressor includes: acquiring a duty cycle compensation coefficient; and calculating the product of the operation current value of the compressor and the duty cycle compensation coefficient as the duty cycle compensation value.
In some embodiments, obtaining a target duty cycle from the dc bus voltage value, the actual current value of the PFC circuit, the input ac voltage value, and the duty cycle compensation value includes: obtaining an initial duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit and the input alternating current voltage value; a sum of the initial duty cycle and the duty cycle compensation value is calculated as the target duty cycle.
In some embodiments, obtaining the control parameter compensation value of the compressor according to the input alternating voltage value, the actual current value of the PFC circuit and the rotational speed value of the compressor includes: obtaining the input power of the PFC circuit according to the input alternating voltage value and the actual current value of the PFC circuit; obtaining fluctuation power according to the input power of the PFC circuit; and obtaining a control parameter compensation value of the compressor according to the fluctuation power and the rotating speed value of the compressor.
In some embodiments, obtaining a control parameter compensation value for the compressor based on the fluctuating power and a rotational speed value of the compressor includes: calculating a product value of the fluctuation power and the reciprocal of the rotational speed value of the compressor to obtain an electromagnetic torque compensation value, wherein the electromagnetic torque compensation value is used as a control parameter compensation value of the compressor; or calculating the product value of the fluctuation power and the reciprocal of the rotating speed value of the compressor to obtain an electromagnetic torque compensation value, further obtaining a q-axis current compensation value according to the electromagnetic torque compensation value and the torque coefficient of the compressor, and taking the q-axis current compensation value as a control parameter compensation value of the compressor; or calculating the product value of the fluctuation power and the reciprocal of the rotating speed value of the compressor to obtain an electromagnetic torque compensation value, further obtaining an initial q-axis current compensation value according to the electromagnetic torque compensation value and a torque coefficient of the compressor, calculating the product value of the initial q-axis current compensation value and a current compensation coefficient to obtain a target q-axis current compensation value, and taking the target q-axis current compensation value as a control parameter compensation value of the compressor, wherein the compensation coefficient is more than or equal to 0 and less than or equal to 1.
In some embodiments, the rotational speed value of the compressor includes a target rotational speed value of the compressor and an actual rotational speed value of the compressor, and obtaining the target control parameter of the compressor according to the control parameter compensation value of the compressor, the rotational speed value of the compressor, the rotor electrical angle position value, and the three-phase current value of the compressor includes: obtaining a target q-axis parameter to be compensated according to a target rotating speed value of the compressor and an actual rotating speed value of the compressor, wherein the target q-axis parameter to be compensated comprises a target q-axis current value to be compensated or a target electromagnetic torque value to be compensated; calculating the sum of the target q-axis parameter to be compensated and the control parameter compensation value of the compressor to obtain a compensated target q-axis parameter; and obtaining a target q-axis control parameter according to the compensated target q-axis parameter and the actual q-axis parameter.
In some embodiments, obtaining the target control parameter of the compressor from the control parameter compensation value of the compressor, the rotational speed value of the compressor, the rotor electrical angle position value, and the three-phase current value of the compressor further comprises: obtaining the actual q-axis parameter and the actual d-axis parameter according to the rotor electric angle position value and the three-phase current value of the compressor; and obtaining a target d-axis control parameter according to the actual d-axis parameter and the target d-axis parameter.
An embodiment of a second aspect of the present invention provides a variable frequency air conditioner, including: at least one processor; a memory communicatively coupled to at least one of the processors; the memory stores a computer program executable by at least one processor, and the control method of the variable frequency air conditioner described in the above embodiment is implemented when the at least one processor executes the computer program.
According to the variable frequency air conditioner provided by the embodiment of the invention, the control method of the variable frequency air conditioner provided by the embodiment is executed by the processor, so that the purpose of inhibiting the fluctuation of the voltage of the direct current bus can be realized, and the use reliability is improved.
An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the control method of a variable frequency air conditioner described in the foregoing embodiment.
An embodiment of a fourth aspect of the present invention provides a variable frequency air conditioner, including: the power supply circuit comprises a rectifying circuit, a PFC circuit, an inverter circuit and a compressor; the voltage acquisition unit is used for acquiring a direct current bus voltage value and an input alternating current voltage value; the current acquisition unit is used for acquiring the actual current value of the PFC circuit, the running current value of the compressor and the three-phase current value of the compressor; the rotating speed acquisition unit is used for acquiring the actual rotating speed value and the rotor electric angle position value of the compressor; and the control module is used for executing the control method of the variable frequency air conditioner.
According to the variable frequency air conditioner provided by the embodiment of the invention, the control module is used for executing the control method of the variable frequency air conditioner provided by the embodiment of the invention, so that the purpose of inhibiting the fluctuation of the voltage of the direct current bus can be realized, and the use reliability is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a flowchart of a control method of a variable frequency air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic view of a structure of a variable frequency air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of a variable frequency air conditioner according to an embodiment of the present invention;
fig. 4 is a block diagram of a variable frequency air conditioner according to another embodiment of the present invention.
Reference numerals:
a variable frequency air conditioner 10;
a rectifying circuit 1; a PFC circuit 2; an inverter circuit 3; a compressor 4; a voltage acquisition unit 5; a current acquisition unit 6; a rotation speed acquisition unit 7; a control module 8; a processor 11; a memory 12.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
Because the variable frequency controller in the variable frequency air conditioner generally adopts an AC-DC-AC structure, the input end of the variable frequency controller is single-phase alternating current, the alternating current is rectified into direct current through an active or passive PFC circuit, and the input power of the PFC circuit always comprises fluctuation power with the frequency of twice that of a power grid; and the output end of the variable frequency controller is a compressor, and the load of the compressor is a periodic fluctuation load. Therefore, based on the above reasons, the direct current bus voltage fluctuation caused by the fluctuation of the alternating current input end and the compressor output end exists in the direct current bus voltage in the variable frequency air conditioner at the same time, and the specific principle is as follows, so that the direct current bus capacitor is heated up, the service life is shortened, and the whole service life and reliability of the variable frequency controller are also affected.
When the input of the power grid is single-phase alternating current and the PFC circuit is started, the input alternating voltage value u of the power grid ac And the actual current value i of the PFC circuit ac Can be respectively communicated withIs expressed by the following formula.
Wherein U is ac To input the effective value of the alternating voltage, I ac To input the effective value of alternating current omega s For the frequency of the power grid,is the current phase angle on the grid side.
The expression formula of the input power Pin of the unidirectional PFC circuit is as follows.
Wherein,for the direct current component>Is an alternating current component.
As can be seen from the formula (3), when the power grid input is single-phase alternating current, the input power of the PFC circuit is always constant power and the fluctuation power of twice the power grid frequency is superimposed.
Further, since the load of the compressor is a periodic fluctuating load, the electromagnetic torque and the rotational speed value of the compressor each include a fluctuating component, and the fluctuating component is approximately expressed as a sinusoidal fluctuating component, and the expression formula of the electromagnetic torque and the rotational speed value of the compressor is as follows.
Wherein T is e-comp Is electromagnetic torque, T e As a direct current component of electromagnetic torque, deltaT e Omega is the fluctuating component of electromagnetic torque comp For the rotational speed value, ω is the direct current component of the rotational speed value, Δω is the fluctuating component of the rotational speed value,for the phase of the electromagnetic torque,is the phase of the rotational speed value.
The output power of the inverter-side compressor, that is, the output power of the PFC circuit can be obtained from the above-described formulas (4) and (5) as follows.
Under the condition that the influence of factors such as switching loss in the PFC circuit is not considered, the input power Pin of the PFC circuit is approximately equal to the input power of the direct current bus capacitor, and the output power Pout of the PFC circuit is approximately equal to the output power of the direct current bus capacitor, so the instantaneous power of the direct current bus capacitor can be expressed as:
Wherein C is the capacitance value of the direct current bus, u dc For the dc bus voltage, the dc bus voltage contains a dc component and a ripple component, which can be expressed specifically as:
u dc ＝U dc +ΔU dc formula (8)
Wherein U is dc Is the direct current component of the direct current bus voltage, deltaU dc Is a fluctuating component of the dc bus voltage.
And (3) integrating the two sides of the equal sign of the formula (7) simultaneously to obtain an energy balance equation of the direct current bus. Considering the input energy, the output energy and the bus capacitor energy, the direct current component and the alternating current component of the input energy, the output energy and the bus capacitor energy are respectively equal, substituting the formula (3), the formula (6) and the formula (8) into the formula (7), and neglecting u dc The higher order terms in the square can be used to obtain the balance equations of the energy on the DC bus as follows.
Direct current component of energy on the direct current bus:
ac component of energy on dc bus:
based on the formula (10), the dc bus voltage fluctuation caused by the single-phase ac input power is as shown in the following formula (11).
Wherein,for grid-side ripple component,/-> A first fluctuation component, a second fluctuation component, and a third fluctuation component on the compressor side, respectively.
Therefore, it is known from the above formula that the fluctuation component of the dc bus voltage includes a grid-side fluctuation component and a compressor-side fluctuation component, respectively, that is, the dc bus voltage fluctuation is caused by the common superposition of the energy fluctuation of the grid side and the energy fluctuation of the compressor side.
Further, in the case of low-frequency operation of the compressor, in order to reduce vibration of the system, torque compensation is added in compressor control, at this time, because the addition of the torque compensation and the filtering effect of the compressor on load torque are weaker, and the overall power is lower, the direct current bus voltage fluctuation is mainly caused by the torque fluctuation of the compressor; in the case of high-frequency operation of the compressor, the torque fluctuation of the compressor is small, and the overall power is large, namely the input power of the alternating-current side of the variable-frequency controller is large, so that the direct-current bus voltage fluctuation is mainly caused by the power grid side. Therefore, in general, the amplitude of the second fluctuation component of the compressor in formula (11) is much larger than the amplitudes of the first fluctuation component and the third fluctuation component of the compressor, i.eAccordingly, the dc bus voltage fluctuation can be expressed approximately as the following formula.
In the related art, the direct current bus voltage is controlled by the PFC circuit, and for the control method of the variable frequency controller, the PFC circuit control on the rectifying side is completely decoupled from the compressor control on the inverting side, the response speed of the PFC circuit control is slower, and the direct current bus voltage fluctuation caused by the double power grid frequency and the compressor running frequency can not be restrained.
In order to solve the above problems, an embodiment of the first aspect of the present invention provides a control method of a variable frequency air conditioner, by which the purpose of suppressing the fluctuation of the dc bus voltage can be achieved, and the reliability of use is improved.
The following describes a control method of a variable frequency air conditioner according to an embodiment of the present invention with reference to fig. 1, and as shown in fig. 1, the control method at least includes steps S1 to S5. The variable frequency air conditioner comprises a PFC circuit and a compressor.
And S1, acquiring a direct current bus voltage value, an actual current value of a PFC circuit, an input alternating current voltage value, an operation current value of a compressor, a rotating speed value of the compressor, a rotor electric angle position value and a three-phase current value of the compressor.
Specifically, referring to fig. 2, the voltage across the dc bus capacitor is the dc bus voltage u dc The actual current value of the PFC circuit is the ac current value i at the input side of the PFC circuit 2 ac The input AC voltage value is u ac And the rotation speed value of the compressor comprises a target rotation speed value omega and an actual rotation speed value omega of the compressor, a rotor electric angle position value theta, and three-phase current values of the compressor are ia, ib and ic respectively.
In addition, it is considered that in the existing PFC control method, the control process is completely decoupled from the compressor, i.e. the input of the PFC circuit control module 14 has only the dc bus voltage value u dc The actual current value of the PFC circuit is i ac And input AC voltage value u ac Without including compressor related variables; the input of the compressor control module 13 is only the operation current value of the compressor, the rotation speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor, but does not contain related variables of PFC circuit control, so that the response speed of the PFC circuit control module 14 is low, direct current bus voltage fluctuation caused by double power grid frequency and compressor operation frequency cannot be restrained, in this way, PFC circuit control and compressor control are mutually coupled, when the PFC circuit is controlled, the operation current value i of the compressor is directly introduced, the change of the compressor load is directly reflected through the operation current value i of the compressor, when the load of the compressor fluctuates, the PFC circuit control module 14 can respond timely according to the operation current value i of the compressor, so that direct current bus voltage fluctuation caused by the compressor load fluctuation is restrained, and the input alternating current voltage value u is introduced in the control of the compressor ac And the actual current value i of the PFC circuit ac So as to restrain fluctuation of the direct current bus voltage caused by fluctuation of the grid frequency at the grid side by controlling the compressor.
And S2, obtaining a duty cycle compensation value according to the running current value of the compressor, and obtaining a control parameter compensation value of the compressor according to the input alternating current voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor.
In order to reduce fluctuation of the voltage of the direct current bus, the method of the embodiment of the invention has the basic thought that fluctuation components exist in the voltage of the direct current bus based on fluctuation of a load of a compressor, and the fluctuation of the voltage of the direct current bus caused by the fluctuation of the load of the compressor is taken as a compensation quantity to be compensated into the duty ratio of the PFC circuit when the PFC circuit is controlled, so that the PFC circuit can output a stable direct current bus voltage value, effectively inhibit the fluctuation of the voltage of the direct current bus caused by the fluctuation of the load of the compressor, and meanwhile, the input power of the compressor is compensated for corresponding fluctuation power when the compressor at the inversion side is controlled based on the fluctuation power existing at the power grid side, so that the fluctuation of the frequency of the corresponding power grid exists at both sides of a direct current bus capacitor, and the power at both sides of the direct current bus capacitor is consistent, thereby effectively inhibiting the fluctuation of the voltage of the direct current bus caused by the fluctuation of the power grid frequency at the power grid side, and improving the use reliability.
Specifically, since the voltage value of the dc bus is affected by the input of the grid side and the output of the inverter side (i.e., the compressor), when the operation current value of the compressor increases, the energy required to be output by the dc bus increases to meet the energy requirement of the compressor, but the response speed of the PFC circuit control module is slow, so that the energy input by the ac side cannot balance the energy output by the compressor in a short time, and therefore, the energy in the dc bus capacitor decreases at this time, resulting in the decrease of the dc bus voltage; otherwise, the dc bus voltage rises. In addition, due to the input voltage u of the PFC circuit i And the voltage value u of the direct current bus dc (i.e., the output voltage value of the PFC circuit) and the duty ratio d satisfy the following formula.
As can be seen from the above formula, when the input voltage u of the PFC circuit i Keep stable, direct current bus voltage value u dc In case of a change due to a change in the load of the compressor, the compressor is operated in such a manner thatDC bus voltage value u dc Quick recovery requires quick adjustment of the duty ratio d, but in the existing PFC control method, when the dc bus voltage value u is dc When the load changes, the duty ratio d is adjusted by a voltage control loop and a current control loop, the response speed is very slow, and the response speed of the load change of the compressor cannot be met, so that the load fluctuation of the compressor can cause larger fluctuation of the voltage of the direct current bus.
Therefore, in order to solve the above problems, in the embodiment of the present invention, when the PFC circuit is controlled, the operating current value i of the compressor is directly introduced, and the change of the load of the compressor can be directly reflected based on the operating current value i of the compressor, so that the duty cycle compensation value d1 is obtained by the operating current value i of the compressor, that is, the fluctuation of the dc bus voltage caused by the fluctuation of the load of the compressor is taken as the compensation amount of a duty cycle, and the operating current value i of the compressor does not need to pass through the voltage control loop and the current control loop, so that the PFC circuit control module can directly obtain the duty cycle compensation value d1 from the operating current value i of the compressor, thereby meeting the response speed of the change of the load of the compressor, and further, when the PFC circuit control module controls the duty cycle of the PFC circuit, the duty cycle compensation value d1 is compensated into the duty cycle of the PFC, thereby achieving the purpose of effectively suppressing the fluctuation of the dc bus voltage caused by the fluctuation of the load of the compressor.
In some embodiments, the operating current value i of the compressor is a current variable that can directly reflect the change of the load of the compressor, for example, referring to fig. 2, it may include any one of the Q-axis target current value iq, the Q-axis actual current value iq, the target current vector value is and the actual current vector value is of the compressor, i.e. i=iq or i=is or i=is=is, so that, when compensating the duty ratio of the PFC circuit, the duty ratio compensation amount d1 may be linearly changed according to the current variable, so as to effectively suppress the dc bus voltage fluctuation caused by the load fluctuation of the compressor.
Wherein the target current vector value is and the actual current vector value is may be calculated by the following formula.
Wherein id is the D-axis target current value, iq is the Q-axis target current value, id is the D-axis actual current value, and iq is the Q-axis actual current value.
And, because the direct current bus voltage is controlled by the PFC circuit, and when the compressor is controlled, the direct current bus voltage is realized through the control parameters of the compressor, such as the running current or electromagnetic torque of the compressor, and the like, but not directly controlling the input power of the compressor, the PFC circuit control and the compressor control are coupled, namely, the obtained input alternating voltage value u of the PFC circuit is used for reducing the fluctuation of the direct current bus voltage and realizing the purpose of compensating the input power of the compressor ac And the actual current value i of the PFC circuit ac The control parameter compensation value of the inverter compressor is obtained by combining the rotating speed value of the compressor, so that the control parameter compensation value of the compressor is compensated into the control parameter of the inverter compressor, the input power of the compressor, namely the output power of the inverter side, is compensated by the corresponding power grid frequency fluctuation power and is consistent with the input power of the power grid side, and for the fluctuation of the DC bus voltage, the input power of the compressor, namely the power grid frequency fluctuation power compensated by the output power of the inverter side, exactly counteracts the fluctuation power of twice the power grid frequency of the power grid input side, thereby effectively inhibiting the fluctuation of the DC bus voltage, prolonging the service life of the bus capacitor and improving the overall use reliability.
And step S3, obtaining a target duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty ratio compensation value.
Specifically, as is apparent from the above, when the operation current value of the compressor increases, the dc bus voltage value u dc The duty ratio d is increased to restore the device; conversely, when the compressor is runningWhen the row current value decreases, the duty cycle d needs to be decreased. Therefore, when the PFC circuit control module controls the duty ratio of the PFC circuit, the target duty ratio d is obtained through the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty ratio compensation value d1, namely, the duty ratio compensation value d1 is compensated into the duty ratio of the PFC to obtain the target duty ratio d, so that when the PFC circuit control module controls the duty ratio of the PFC circuit, the direct current bus voltage fluctuation caused by the load fluctuation of the compressor is effectively restrained.
And S4, obtaining target control parameters of the compressor according to the control parameter compensation value of the compressor, the rotating speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor.
Specifically, the initial control parameters of the compressor can be obtained through the rotation speed value of the compressor, the electric angle position value of the rotor and the three-phase current value of the compressor, so that fluctuation of the DC bus voltage is reduced, the initial control parameters of the compressor are compensated by the control parameter compensation value of the compressor to obtain target control parameters of the compressor, when the compressor is controlled by the compensated target control parameters, the input power of the compressor, namely the output power of the inverter side, also compensates corresponding power grid frequency fluctuation power and is consistent with the input power of the power grid side, and for fluctuation of the DC bus voltage, the input power of the compressor, namely the power grid frequency fluctuation power compensated by the output power of the inverter side, exactly counteracts the fluctuation power of twice the power grid frequency at the input side of the power grid, thereby effectively inhibiting fluctuation of the DC bus voltage, prolonging the service life of the bus capacitor and improving the integral use reliability.
And S5, controlling the PFC circuit according to the target duty ratio and controlling the compressor according to the target control parameter of the compressor, so that the direct-current bus voltage fluctuation caused by single-phase alternating-current input power and the compressor fluctuation load can be restrained simultaneously by coupling the PFC circuit control and the compressor control, and the bus capacitor service life and the whole machine reliability are effectively improved.
According to the control method of the variable frequency air conditioner, since the direct current bus voltage is influenced by the input of the power grid side and the output of the inverter side, the influence of the load fluctuation of the compressor is considered, the duty cycle compensation value is obtained through the operation current value of the compressor, the target duty cycle is obtained according to the duty cycle compensation value, the direct current bus voltage value, the actual current value of the PFC circuit and the input alternating current voltage value, and therefore when the PFC circuit is controlled, the duty cycle of the PFC circuit is compensated through the duty cycle compensation value to obtain the target duty cycle, when the PFC circuit is controlled through the target duty cycle, the PFC circuit can stabilize the output direct current bus voltage value, direct current bus voltage fluctuation caused by the load fluctuation of the compressor is effectively restrained, meanwhile, the control parameter compensation value of the compressor is obtained through the input alternating current voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor, and the target control parameter of the compressor is obtained through the control parameter compensation value, namely, the control parameter compensation value is used as the power grid side, the control parameter compensation value is used for generating the control parameter compensation value, and the control parameter compensation value is used for the power grid side fluctuation frequency fluctuation is controlled, and the power grid side power grid frequency fluctuation is effectively restrained, and the influence of the power grid side power grid frequency fluctuation is caused, and the control parameter fluctuation is caused by the power grid frequency fluctuation is controlled.
In some embodiments, the duty cycle compensation coefficient is obtained, e.g., denoted as K PFC Calculating an operating current value i and a duty cycle compensation coefficient K of the compressor PFC For example, denoted d1 as the duty cycle compensation value, i.e. d1=k PFC * i, the duty ratio compensation value d1 is calculated, so that the duty ratio of the PFC circuit can be linearly changed along with the operation current value i of the compressor, and the direct current bus voltage fluctuation caused by the compressor load fluctuation is effectively restrained. Wherein the duty cycle compensation coefficient K PFC The duty ratio range of the PFC circuit, the operating current value range of the compressor, and the like may be determined without limitation. It can be appreciated that the coefficient K is compensated according to the duty cycle PFC The calculated duty cycle compensation amount d1 needs to ensure that the obtained target duty cycle d is in a reasonable range after the duty cycle compensation of the PFC circuit。
In some embodiments, 0.ltoreq.target duty cycle d.ltoreq.1, the duty cycle compensation coefficient K being determined based on this range PFC The compensation quantity of the PFC duty ratio, namely the duty ratio compensation value d1, can be effectively ensured to be in a reasonable range.
In some embodiments, according to the DC bus voltage value u dc Actual current value i of PFC circuit ac And input AC voltage value u ac Obtaining an initial duty cycle di; the sum of the initial duty ratio di and the duty compensation value d1 is calculated as the target duty ratio d. The initial duty ratio di may be understood as a duty ratio calculated by the PFC circuit control module when the PFC circuit control is not coupled with the compressor control.
Specifically, referring to fig. 2, by obtaining a target dc bus voltage value, i.e., u shown in fig. 2 dc * The method comprises the steps of carrying out a first treatment on the surface of the According to the target DC bus voltage value u dc * DC bus voltage value u dc And input ac voltage value |u ac I obtaining a target current value i of the PFC circuit through a voltage control loop ac * The method comprises the steps of carrying out a first treatment on the surface of the According to the target current value i ac * And an actual current value i ac The initial duty ratio di is obtained through the current control loop, it is understood that the control variable of the compressor is not introduced in the process of calculating the initial duty ratio di, so that when the load of the compressor fluctuates, the response speed of the PFC circuit control module is slower, the response speed of the load change of the compressor cannot be met, and therefore the load fluctuation of the compressor can cause larger fluctuation of the DC bus voltage, therefore, in order to solve the problem, after calculating the initial duty ratio di, the control variable of the compressor, namely the operation current value i of the compressor is introduced, the duty ratio compensation value d1 is obtained based on the control variable, and then the sum value of the initial duty ratio di and the duty ratio compensation value d1 is calculated as the target duty ratio d, namely d=di+d1, and therefore when the load fluctuation of the compressor occurs, the duty ratio compensation value d1 is obtained according to the fluctuation of the operation current value i of the compressor and is compensated into the initial duty ratio di as the compensation quantity, so as to offset the DC bus voltage caused by the fluctuation of the compressor, and thus the duty ratio of the load fluctuation of the compressor can be controlled when the load fluctuation of the compressor occurs, the duty ratio d can be suppressed The voltage of the direct current bus fluctuates due to the fluctuation.
In some embodiments, according to the input AC voltage value u ac And the actual current value i of the PFC circuit ac Obtaining the input power of a PFC circuit; obtaining fluctuation power according to the input power of the PFC circuit; and obtaining a control parameter compensation value of the compressor according to the fluctuation power and the rotating speed value of the compressor.
Specifically, referring to fig. 2, an input ac voltage value u is calculated ac And the actual current value i of the PFC circuit ac As the product of the input power Pin of PFC circuit, i.e. pin=u ac *i ac Further, the PFC circuit input power Pin is passed through a high-pass filter or a band-pass filter to obtain a fluctuating power P in-ac The fluctuating power P in-ac I.e. the ac component of the grid-side input power, i.e. the fluctuating component of the ac input power of the PFC circuit, so that the ac input power is dependent on the fluctuating power P in-ac And the rotating speed value of the compressor obtains a control parameter compensation value of the compressor so as to compensate the input power of the inverter-side compressor and reduce the fluctuation of the DC bus voltage.
In some embodiments, for the power P according to fluctuation in-ac The control parameter compensation value of the compressor obtained by the rotating speed value of the compressor is consistent with the target control parameter of the compressor, namely, if the control quantity of the compressor is electromagnetic torque, the target control parameter of the compressor is electromagnetic torque, and the control parameter compensation value of the compressor correspondingly obtained is electromagnetic torque; or if the control quantity of the compressor is the running current of the compressor, the target control parameter of the compressor is the running current of the compressor, and the compensation value of the control parameter of the compressor correspondingly obtained is the running current of the compressor.
For example, the fluctuating power P may be calculated in-ac And the inverse of the rotational speed value of the compressor to obtain an electromagnetic torque compensation value Δte, and taking the electromagnetic torque compensation value Δte as a control parameter compensation value of the compressor. The rotation speed value of the compressor can be a target rotation speed value omega of the compressor and an actual rotation speed value omega, specifically, the control quantity of the compressor is electromagnetic torque, so the control quantity is calculated by a meterCalculating electromagnetic torque compensation value DeltaTe as control parameter compensation value of compressor according to fluctuation power P in-ac And the electromagnetic torque compensation value obtained from the rotation speed value of the compressor is Or->Therefore, the electromagnetic torque compensation value delta Te is taken as a control parameter compensation value of the compressor, and after the input power of the inverter-side compressor is compensated, the power grid frequency fluctuation component in the alternating current input power of the PFC circuit can be effectively counteracted, so that the purpose of inhibiting the fluctuation of the direct current bus voltage is realized.
Alternatively, the fluctuating power P may be calculated in-ac The product value of the reciprocal of the rotational speed value of the compressor to obtain an electromagnetic torque compensation value Δte is further based on the electromagnetic torque compensation value Δte and the compressor torque coefficient, for example, denoted as K T The q-axis current compensation value Δiq is obtained and is used as a control parameter compensation value of the compressor. Specifically, referring to fig. 2, the control amount of the compressor is a q-axis current value, and thus by calculating the q-axis current compensation value Δiq as a control parameter compensation value of the compressor, the control parameter compensation value is calculated based on the electromagnetic torque compensation value Δte and the compressor torque coefficient K T The q-axis current compensation value obtained isOr-> Thus, the q-axis current compensation value Δiq is used as a control parameter compensation value of the compressor, and the input power of the inverter-side compressor is compensated, so that the PFC circuit crossover can be effectively counteractedThe power grid frequency fluctuation component in the current input power realizes the purpose of restraining the fluctuation of the DC bus voltage.
Further, in practical application, in order to achieve the control performance of the compressor and the suppression effect of the voltage fluctuation of the direct current bus to achieve the overall optimal control effect, the embodiment of the invention can also calculate the fluctuation power P in-ac The product value of the reciprocal of the rotational speed value of the compressor to obtain an electromagnetic torque compensation value Δte, and the compressor torque coefficient K is further based on the electromagnetic torque compensation value Δte T Obtaining an initial q-axis current compensation value Deltaiq 0 And calculates an initial q-axis current compensation value Δiq 0 And current compensation coefficient K comp To obtain a target q-axis current compensation value Δiq, and using the target q-axis current compensation value Δiq as a control parameter compensation value of the compressor, that is, increasing the current compensation coefficient K when compensating the q-axis current value, which is the control quantity of the compressor comp Therefore, the magnitude of the target q-axis current compensation value delta iq can be flexibly adjusted, and the overall optimal control effect is realized.
Specifically, referring to FIG. 2, an initial q-axis current compensation valueTarget q-axis current compensation valueTherefore, the target q-axis current compensation value delta iq is used as a control parameter compensation value of the compressor, and after the input power of the inverter-side compressor is compensated, the power grid frequency fluctuation component in the alternating current input power of the PFC circuit can be effectively counteracted, so that the purpose of inhibiting the fluctuation of the direct current bus voltage is achieved.
Wherein, the current compensation coefficient K is more than or equal to 0 comp ≤1。
In some embodiments, the rotation speed value of the compressor includes a target rotation speed value ω of the compressor and an actual rotation speed value ω of the compressor, and the target q-axis parameter to be compensated may be obtained according to the target rotation speed value ω of the compressor and the actual rotation speed value ω of the compressor, where the target q-axis parameter to be compensated includes a target q-axis current value to be compensated or a target electromagnetic torque value to be compensated; calculating the sum of the target q-axis parameter to be compensated and the compensation value of the control parameter of the compressor to obtain a compensated target q-axis parameter; and obtaining a target q-axis control parameter according to the compensated target q-axis parameter and the actual q-axis parameter.
For example, referring to fig. 2, where iq1 is a target q-axis current value to be compensated, the q-axis current compensation value Δiq calculated above or the target q-axis current compensation value Δiq is used as a control parameter compensation value of the compressor, and the compensated target q-axis parameter is the compensated target q-axis current value iq, i.e., iq= Δiq+iq 1, and the target q-axis control parameter Uq is obtained by using the compensated target q-axis parameter iq and the actual q-axis parameter iq, so as to compensate the input power of the inverter compressor and reduce the fluctuation of the dc bus voltage.
In some embodiments, referring to fig. 2, the actual q-axis parameter iq and the actual d-axis parameter id are obtained from the rotor electrical angle position value θ and the three-phase current values of the compressor, i.e., ia, ib, ic shown in fig. 2; further, a target d-axis control parameter Ud is obtained from the actual d-axis parameter id and the target d-axis parameter id, whereby control of the compressor is achieved with the target q-axis control parameter and the target d-axis control parameter.
In a word, according to the control method of the variable frequency air conditioner provided by the embodiment of the invention, the control parameters of the compressor such as q-axis current and the duty ratio of the PFC circuit are correspondingly compensated by coupling the control of the compressor and the control of the PFC circuit, so that the direct current bus voltage fluctuation caused by single-phase alternating current input power and the fluctuation load of the compressor can be simultaneously restrained, the service life of an electrolytic capacitor is effectively prolonged, and the reliability of the whole variable frequency air conditioner is improved.
A second aspect of the present invention provides a variable frequency air conditioner, as shown in fig. 3, the variable frequency air conditioner 10 including at least one processor 11 and a memory 12 communicatively connected to the at least one processor 11.
The memory 12 stores a computer program executable by the at least one processor 11, and the control method of the inverter air conditioner provided in the above embodiment is implemented when the at least one processor 11 executes the computer program.
It should be noted that, the specific implementation manner of the variable frequency air conditioner 10 according to the embodiment of the present invention is similar to the specific implementation manner of the control method of the variable frequency air conditioner according to any of the embodiments of the present invention, please refer to the description of the method section specifically, and in order to reduce redundancy, the description is omitted here.
According to the variable frequency air conditioner 10 of the embodiment of the invention, the purpose of suppressing the fluctuation of the DC bus voltage can be achieved and the use reliability can be improved by executing the control method of the variable frequency air conditioner provided by the embodiment through the processor 11.
An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the control method of the inverter air conditioner provided in the above embodiment.
The fourth aspect of the present invention provides an air conditioner, as shown in fig. 4, the variable frequency air conditioner 10 includes a rectifying circuit 1, a PFC circuit 2, an inverter circuit 3, a compressor 4, a voltage collecting unit 5, a current collecting unit 6, a rotation speed collecting unit 7, and a control module 8.
The voltage acquisition unit 5 is used for acquiring a direct current bus voltage value and an input alternating current voltage value; the current acquisition unit 6 is used for acquiring an actual current value of the PFC circuit 2, an actual current value of the PFC circuit, an operation current value of the compressor 4 and a three-phase current value of the compressor 4; the rotating speed acquisition unit 7 is used for acquiring an actual rotating speed value and a rotor electric angle position value of the compressor 4; the control module 8 is configured to execute the control method of the variable frequency air conditioner provided in the foregoing embodiment.
Specifically, referring to fig. 2, the control module 8 includes a compressor control module 13 and a PFC circuit control module 14. The compressor control module 13 controls the operation of the compressor 4 according to the related variable of the compressor 4 and the related variable controlled by the introduced PFC circuit, wherein the related variables are respectively: the target rotation speed value omega of the compressor is equal to the actual rotation speed value omega; a rotor electrical angle position value θ of the compressor; d-axis target current value id x and D-axis actual current value id; q-axis target current value iq and Q-axis actual current value iq; d-axis target voltage valueud and Q axis target voltage value uq; three-phase currents of the compressor are ia, ib and ic respectively; the input power of the PFC circuit is Pin; the fluctuation power, namely the alternating current component of the input power of the PFC circuit, is Pin-ac; the electromagnetic torque compensation value is that the fluctuation electromagnetic torque expected to be injected into the compressor is delta Te; the q-axis current compensation value is Δiq; the torque coefficient of the compressor is K T That is, the relation between the electromagnetic torque and the q-axis current value satisfies te=kt×iq; k (K) comp The constant value is used for adjusting the magnitude of the Q-axis current compensation value delta iq, and the value range of the constant value delta iq is more than or equal to 0 and less than or equal to 1; HPF denotes a high pass filter; the BPF represents a band-pass filter.
And, the PFC circuit control module 14 controls the dc bus voltage according to the related variable of the PFC circuit 2 and the related variable of the introduced compressor control, where the related variables are respectively: target DC bus voltage value u dc * And the actual DC bus voltage value u dc The method comprises the steps of carrying out a first treatment on the surface of the Target current value i of PFC circuit ac * And the actual current value i ac The method comprises the steps of carrying out a first treatment on the surface of the Input ac voltage value u ac The method comprises the steps of carrying out a first treatment on the surface of the A target duty cycle d; an initial duty cycle di; compensation coefficient K PFC The method comprises the steps of carrying out a first treatment on the surface of the The operating current value i of the compressor, which has four choices, i=iq or i=is; the duty compensation amount is d1=k PFC I. Therefore, when the control module 9 controls the PFC circuit 2 by adopting the control method of the inverter air conditioner provided in the above embodiment, the duty ratio of the PFC circuit 2 is the target duty ratio d=di+k PFC I. Therefore, the control module 9 can realize the simultaneous suppression of direct current bus voltage fluctuation caused by single-phase alternating current input power and compressor fluctuation load by the way of coupling PFC circuit control and compressor control, and effectively improve bus capacitor life and overall machine reliability.
It should be noted that, the specific implementation manner of the variable frequency air conditioner 10 according to the embodiment of the present invention is similar to the specific implementation manner of the control method of the variable frequency air conditioner according to any of the embodiments of the present invention, please refer to the description of the method section specifically, and in order to reduce redundancy, the description is omitted here.
According to the air conditioner 10 of the embodiment of the invention, the control module 8 executes the control method of the variable frequency air conditioner provided by the embodiment, so that the purpose of inhibiting the fluctuation of the voltage of the direct current bus can be achieved, and the use reliability is improved.
In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing logical functions or steps of the process, and in which the scope of the preferred embodiments of the present invention include additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," 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 invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. The control method of the variable frequency air conditioner is characterized in that the variable frequency air conditioner comprises a PFC circuit and a compressor, and comprises the following steps:
obtaining a direct current bus voltage value, an actual current value of a PFC circuit, an input alternating current voltage value, an operation current value of a compressor, a rotating speed value of the compressor, a rotor electric angle position value and a three-phase current value of the compressor;
obtaining a duty cycle compensation value according to the running current value of the compressor, and obtaining a control parameter compensation value of the compressor according to the input alternating voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor;
obtaining a target duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty ratio compensation value;
obtaining a target control parameter of the compressor according to the control parameter compensation value of the compressor, the rotating speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor;
controlling the PFC circuit according to the target duty cycle, and controlling the compressor according to a target control parameter of the compressor;
obtaining a duty cycle compensation value according to an operation current value of the compressor, comprising: acquiring a duty cycle compensation coefficient; calculating a product of an operation current value of the compressor and the duty compensation coefficient as the duty compensation value;
Obtaining a control parameter compensation value of the compressor according to the input alternating voltage value, the actual current value of the PFC circuit and the rotating speed value of the compressor, wherein the control parameter compensation value comprises the following components: obtaining the input power of the PFC circuit according to the input alternating voltage value and the actual current value of the PFC circuit; obtaining fluctuation power according to the input power of the PFC circuit; obtaining a control parameter compensation value of the compressor according to the fluctuation power and the rotating speed value of the compressor;
obtaining a target duty cycle according to the direct current bus voltage value, the actual current value of the PFC circuit, the input alternating current voltage value and the duty cycle compensation value, including: obtaining an initial duty ratio according to the direct current bus voltage value, the actual current value of the PFC circuit and the input alternating current voltage value; calculating a sum of the initial duty cycle and the duty cycle compensation value as the target duty cycle;
obtaining a control parameter compensation value of the compressor according to the fluctuation power and the rotating speed value of the compressor, wherein the control parameter compensation value comprises the following components: calculating a product value of the fluctuation power and the reciprocal of the rotational speed value of the compressor to obtain an electromagnetic torque compensation value, wherein the electromagnetic torque compensation value is used as a control parameter compensation value of the compressor; or calculating the product value of the fluctuation power and the reciprocal of the rotating speed value of the compressor to obtain an electromagnetic torque compensation value, further obtaining a q-axis current compensation value according to the electromagnetic torque compensation value and the torque coefficient of the compressor, and taking the q-axis current compensation value as a control parameter compensation value of the compressor; or calculating the product value of the fluctuation power and the reciprocal of the rotating speed value of the compressor to obtain an electromagnetic torque compensation value, further obtaining an initial q-axis current compensation value according to the electromagnetic torque compensation value and a torque coefficient of the compressor, and calculating the product value of the initial q-axis current compensation value and a current compensation coefficient to obtain a target q-axis current compensation value, wherein the target q-axis current compensation value is used as a control parameter compensation value of the compressor, and the current compensation coefficient is more than or equal to 0 and less than or equal to 1;
The rotational speed value of the compressor comprises a target rotational speed value of the compressor and an actual rotational speed value of the compressor, and the target control parameter of the compressor is obtained according to the control parameter compensation value of the compressor, the rotational speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor, and the method comprises the following steps: obtaining a target q-axis parameter to be compensated according to a target rotating speed value of the compressor and an actual rotating speed value of the compressor, wherein the target q-axis parameter to be compensated comprises a target q-axis current value to be compensated or a target electromagnetic torque value to be compensated; calculating the sum of the target q-axis parameter to be compensated and the control parameter compensation value of the compressor to obtain a compensated target q-axis parameter; obtaining a target q-axis control parameter according to the compensated target q-axis parameter and the actual q-axis parameter;
obtaining a target control parameter of the compressor according to the control parameter compensation value of the compressor, the rotating speed value of the compressor, the rotor electric angle position value and the three-phase current value of the compressor, and further comprising:
obtaining the actual q-axis parameter and the actual d-axis parameter according to the rotor electric angle position value and the three-phase current value of the compressor; and obtaining a target d-axis control parameter according to the actual d-axis parameter and the target d-axis parameter.
2. A variable frequency air conditioner, comprising:
at least one processor;
a memory communicatively coupled to at least one of the processors;
wherein the memory stores a computer program executable by at least one of the processors, and the control method of the variable frequency air conditioner according to claim 1 is realized when the at least one of the processors executes the computer program.
3. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method of a variable frequency air conditioner according to claim 1.
4. A variable frequency air conditioner, comprising:
the power supply circuit comprises a rectifying circuit, a PFC circuit, an inverter circuit and a compressor;
the voltage acquisition unit is used for acquiring a direct current bus voltage value and an input alternating current voltage value;
the current acquisition unit is used for acquiring the actual current value of the PFC circuit, the running current value of the compressor and the three-phase current value of the compressor;
the rotating speed acquisition unit is used for acquiring the actual rotating speed value and the rotor electric angle position value of the compressor;
a control module for executing the control method of the inverter air conditioner of claim 1.
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