CN113739361B - Air conditioner outdoor unit controller and power estimation method and device thereof - Google Patents

Air conditioner outdoor unit controller and power estimation method and device thereof Download PDF

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Publication number
CN113739361B
CN113739361B CN202111025773.1A CN202111025773A CN113739361B CN 113739361 B CN113739361 B CN 113739361B CN 202111025773 A CN202111025773 A CN 202111025773A CN 113739361 B CN113739361 B CN 113739361B
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compressor
power
current
effective value
air conditioner
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CN113739361A (en
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霍军亚
朱家辉
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/60—Energy consumption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses an air conditioner external unit controller, a power estimation method and a device thereof, and a computer readable storage medium, wherein the method comprises the following steps: determining an effective value of current consumed by the compressor, and obtaining the running power of the compressor; estimating an effective value of an alternating-current power supply voltage according to an effective value of current consumed by the compressor and the running power of the compressor; estimating the running power of the external fan according to the effective value of the alternating-current power supply voltage; and determining the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan. The power estimation method only needs to collect the effective value of the current consumed by the compressor and combines the running power of the compressor to estimate the running power of the fan, thereby estimating the total power of the external machine controller, simplifying the circuit structure and reducing the cost of the controller.

Description

Air conditioner outdoor unit controller and power estimation method and device thereof
Technical Field
The present invention relates to the field of air conditioner technologies, and in particular, to a method for estimating power of an air conditioner outdoor unit controller, a computer readable storage medium, and an apparatus for estimating power of an air conditioner outdoor unit controller.
Background
The existing external machine compressor of the household variable frequency air conditioner generally uses a high-energy-efficiency permanent magnet synchronous motor, and the external machine fan generally uses a low-cost single-phase asynchronous motor. In order to calculate the power of the air conditioner, an ammeter detection module is added, or a power supply voltage detection unit and a power supply current detection unit are added, and the total power of the controller of the air conditioner external unit is calculated through the product of the voltage and the current. However, the above method has the disadvantages of high cost and large volume.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a method for estimating power of an external controller of an air conditioner, which only needs to collect the effective current value consumed by a compressor and combine the operation power of the compressor to estimate the operation power of a fan, thereby estimating the total power of the external controller, simplifying the circuit structure and reducing the cost of the controller.
A second object of the present invention is to provide an air conditioner outdoor unit controller.
A third object of the present invention is to propose a computer readable storage medium.
A fourth object of the present invention is to provide an apparatus for estimating power of an air conditioner outdoor unit controller.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for estimating power of an outdoor unit controller of an air conditioner, the method comprising: determining an effective value of current consumed by a compressor, and obtaining the running power of the compressor; estimating an ac power supply voltage effective value according to the current effective value consumed by the compressor and the operation power of the compressor; estimating the running power of the external fan according to the effective value of the alternating current power supply voltage; and determining the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan.
According to the method for estimating the power of the air conditioner external unit controller, firstly, the effective value of the current consumed by the compressor is determined, the running power of the compressor is obtained, then, the effective value of the alternating current power supply voltage is estimated according to the effective value of the current consumed by the compressor and the running power of the compressor, then, the running power of the external unit fan is estimated according to the effective value of the alternating current power supply voltage, and finally, the total power of the external unit controller is determined according to the running power of the compressor and the running power of the external unit fan. Therefore, the method only needs to collect the effective value of the current consumed by the compressor and can estimate the running power of the fan by combining the running power of the compressor, so that the total power of the external controller can be estimated, the circuit structure is simplified, and the cost of the controller is reduced.
In addition, the method for estimating the power of the air conditioner outdoor unit controller according to the embodiment of the invention may further have the following additional technical features:
according to one embodiment of the invention, the ac supply voltage effective value is estimated by the following formula:
Figure SMS_1
wherein ,
Figure SMS_2
representing the ac mains voltage effective value, a ∈>
Figure SMS_3
Representing the operating power of the compressor,
Figure SMS_4
representing the power factor>
Figure SMS_5
Representing the effective value of the current consumed by the compressor. />
According to one embodiment of the invention, the operating power of the external fan is estimated by the following formula:
Figure SMS_6
wherein ,
Figure SMS_7
indicating the operating power of the external fan, < >>
Figure SMS_8
And the effective value of the alternating-current power supply voltage is represented, and a and b are preset coefficients.
According to one embodiment of the invention, obtaining the operating power of the compressor comprises: determining d-axis current and q-axis current of the compressor, and determining d-axis voltage and q-axis voltage of the compressor; and determining the operation power of the compressor according to the d-axis current and the q-axis current of the compressor and the d-axis voltage and the q-axis voltage of the compressor.
According to one embodiment of the invention, determining d-axis current and q-axis current of the compressor includes: and obtaining the three-phase current of the compressor, and performing Clark coordinate transformation and Park coordinate transformation on the three-phase current of the compressor to obtain the d-axis current and the q-axis current of the compressor.
According to one embodiment of the invention, obtaining three-phase current of the compressor comprises: and acquiring any two-phase current of the compressor through time-sharing multiplexing of the single-phase current sensor, and carrying out current reconstruction according to any two-phase current of the compressor to obtain three-phase current of the compressor.
According to one embodiment of the invention, determining an effective value of current consumed by a compressor includes: and detecting the current of the input end or the current of the output end of the rectifier bridge stack in the air conditioner external unit to obtain the current effective value consumed by the compressor.
In order to achieve the above objective, a second embodiment of the present invention provides an air conditioner outdoor unit controller, which includes a memory, a processor, and an air conditioner outdoor unit controller power estimation program stored in the memory and capable of running on the processor, wherein the processor implements the air conditioner outdoor unit controller power estimation method when executing the air conditioner outdoor unit controller power estimation program.
According to the air conditioner external unit controller provided by the embodiment of the invention, when the processor executes the power estimation program of the air conditioner external unit controller, the power estimation method of the air conditioner external unit controller is realized, and only the power supply voltage or the power supply current is required to be collected, so that the circuit structure is simplified, and the cost of the controller is reduced.
To achieve the above object, according to a third aspect of the present invention, there is provided a computer readable storage medium having stored thereon an air conditioner external controller power estimation program which, when executed by a processor, implements the above-mentioned air conditioner external controller power estimation method.
According to the computer readable storage medium, the power estimation method of the air conditioner external unit controller is realized by executing the power estimation program of the air conditioner external unit controller, and only the power supply voltage or the power supply current is required to be collected, so that the circuit structure is simplified, and the cost of the controller is reduced.
In order to achieve the above object, an embodiment of the present invention provides an apparatus for estimating power of an outdoor unit controller of an air conditioner, comprising: the current determining module is used for determining the effective value of the current consumed by the compressor; the compressor power acquisition module is used for acquiring the running power of the compressor; the voltage estimation module is used for estimating the effective value of the alternating-current power supply voltage according to the effective value of the current consumed by the compressor and the running power of the compressor; the fan power estimation module is used for estimating the running power of the external fan according to the effective value of the alternating-current power supply voltage; and the power determining module is used for determining the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan.
According to the power estimation device of the air conditioner external unit controller, the current effective value consumed by the compressor is determined through the current determination module, the operation power of the compressor is obtained through the compressor power obtaining module, the alternating current power supply voltage effective value is estimated through the voltage estimation module according to the current effective value consumed by the compressor and the operation power of the compressor, the operation power of the external unit fan is estimated through the fan power estimation module according to the alternating current power supply voltage effective value, and the total power of the external unit controller is determined through the power determination module according to the operation power of the compressor and the operation power of the external unit fan. Therefore, the device only needs to collect the effective value of the current consumed by the compressor and can estimate the running power of the fan by combining the running power of the compressor, so that the total power of the external controller can be estimated, the circuit structure is simplified, and the cost of the controller is reduced.
In addition, the power estimation device of the air conditioner outdoor unit controller according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the voltage estimation module estimates the ac supply voltage effective value by the following formula:
Figure SMS_9
wherein ,
Figure SMS_10
representing the ac mains voltage effective value, a ∈>
Figure SMS_11
Representing the operating power of the compressor,
Figure SMS_12
representing the power factor>
Figure SMS_13
Representing the effective value of the current consumed by the compressor.
According to one embodiment of the present invention, the fan power estimation module estimates the operating power of the external fan by the following formula:
Figure SMS_14
wherein ,
Figure SMS_15
indicating the operating power of the external fan, < >>
Figure SMS_16
And the effective value of the alternating-current power supply voltage is represented, and a and b are preset coefficients.
According to one embodiment of the present invention, the compressor power acquisition module acquires the operation power of the compressor, and is specifically configured to: determining d-axis current and q-axis current of the compressor, and determining d-axis voltage and q-axis voltage of the compressor; and determining the operation power of the compressor according to the d-axis current and the q-axis current of the compressor and the d-axis voltage and the q-axis voltage of the compressor.
According to one embodiment of the invention, the compressor power acquisition module determines d-axis current and q-axis current of the compressor, in particular for: and obtaining the three-phase current of the compressor, and performing Clark coordinate transformation and Park coordinate transformation on the three-phase current of the compressor to obtain the d-axis current and the q-axis current of the compressor.
According to one embodiment of the invention, the compressor power acquisition module determines to acquire three-phase current of the compressor, in particular for: and acquiring any two-phase current of the compressor through time-sharing multiplexing of the single-phase current sensor, and carrying out current reconstruction according to any two-phase current of the compressor to obtain three-phase current of the compressor.
According to one embodiment of the invention, the current determination module determines an effective value of current consumed by the compressor, in particular for: and detecting the current of the input end or the current of the output end of the rectifier bridge stack in the air conditioner external unit to obtain the current effective value consumed by the compressor.
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
Fig. 1 is a flowchart of an air conditioner outdoor unit controller power estimation method according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an outdoor unit controller of an air conditioner according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an outdoor unit controller of an air conditioner according to another embodiment of the present invention;
FIG. 4 is a voltage and current waveform diagram of an input AC power source according to one embodiment of the invention;
FIG. 5 is a control schematic of a compressor motor according to one embodiment of the invention;
FIG. 6 is a diagram of dq axis voltage conversion to a stationary coordinate system according to an embodiment of the present invention
Figure SMS_17
Schematic of the shaft voltage;
FIG. 7 is a diagram of one embodiment of the present invention
Figure SMS_18
A schematic diagram of the shaft voltage converted to U, V, W three-phase voltage;
FIG. 8 is a block diagram of an outdoor unit controller of an air conditioner according to an embodiment of the present invention;
fig. 9 is a block diagram illustrating an air conditioner outdoor unit controller power estimation apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
An air conditioner outdoor unit controller power estimation method, an air conditioner outdoor unit controller, a computer readable storage medium, and an air conditioner outdoor unit controller power estimation apparatus according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an air conditioner outdoor unit controller power estimation method according to an embodiment of the present invention.
The power of the external machine controller of the air conditioner is mainly consumed in an air conditioner compressor and an external machine motor, the compressor of the air conditioner system at present adopts a high-energy-efficiency permanent magnet synchronous motor, and the fan motor adopts a single-phase asynchronous motor. The following describes in detail an example in which the total power of the air conditioner external unit controller includes the operation power of the compressor and the operation power of the single-phase asynchronous motor (external unit motor).
In one embodiment of the present invention, as shown in fig. 2, the outdoor unit of the air conditioner in the embodiment of the present invention includes a rectifier bridge 110, a power supply module 120, an IPM module 130 (Intelligent Power Modules, intelligent power module), a compressor 140, an MCU (Microcontroller Unit, microcontroller) control unit 150, an outdoor unit fan (single-phase asynchronous fan motor) 160, and a control switch S. Wherein, the power supply module 120 is used for providing direct current to the IPM module 130. The IPM module 130 drives the compressor 140 to operate according to the direct current, and the MCU control unit 150 is configured to control the control switch S to be closed when the compressor 140 is operated, so as to operate the single-phase asynchronous fan motor.
Specifically, the input AC power AC is rectified by the rectifier bridge stack 110 and then is changed into dc power, the dc power is input to the power supply module 120, so as to charge the power supply module 120, the power supply module 120 provides dc power for the IPM module 130, the IPM module 130 is connected to the compressor 140 and is used for outputting corresponding three-phase driving power to drive the compressor 140 to operate, the external fan 160 is directly connected to the input AC power AC, and a control switch S is provided between the external fan 160 and the input AC power AC as a switch. In the process of supplying power to the compressor 140 by the input AC power source AC, that is, when the compressor is in an operation state, the MCU control unit 150 sends a closing signal to the control switch S, so that the control switch S is in a closing state, so that the input AC power source AC supplies power to the external fan 160, and when the external fan 160 works, the external fan 160 is used for blowing off hot air of the external machine when the air conditioner is operated in a cooling mode, or blowing off cold air of the external machine when the air conditioner is operated in a heating mode.
With continued reference to fig. 2, the rectifier bridge stack 110 is a full bridge rectifier consisting of diode D8, diode D9, diode D10, and diode D11 for rectifying the input AC power AC. The power supply module 120 may include an electrolytic capacitor EC1, and the electrolytic capacitor EC1 has a charge and discharge function. The IPM module 130 is a three-phase bridge circuit having upper and lower bridge arms formed of 6 IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors) (D1, D2, D3, D4, D5, and D6) to control the three-phase motor of the compressor 140.
Specifically, the input AC power AC is rectified by the rectifier bridge 110 and then changed into dc power, and the voltage fluctuates with the AC power. After filtering by the electrolytic capacitor EC1, the dc power is changed into a smooth dc voltage, and the IPM module 130 is powered. The MCU control unit 150 collects the bus voltage, and controls the IPM module 130 to output a three-phase ac voltage by sending driving signals S1 to S6 to the corresponding IGBTs, so as to drive the permanent magnet synchronous motor to operate. When the control switch S is a normally open relay and the air conditioner is powered on, when the MCU control unit 150 does not send a control signal to the control switch S, the control switch S is in an off state, and when the compressor 140 is in an operating state, the MCU control unit 150 can switch on the control switch S to switch on the single-phase asynchronous fan motor, so that the air conditioner can blow off hot air of an external machine in an indoor refrigeration mode or blow off cold air of the external machine in an indoor heating mode through the single-phase asynchronous fan motor.
The rectifier bridge 110 performs a rectification operation on an input current according to single-phase conduction of the diode, and if the input of the input AC power AC is positive half cycle, the input of the input connection point a at the positive electrode of the diode D8 is positive, the diode D8 and the diode D11 are turned on, the diode D9 and the diode D10 are turned off, the current flow in the circuit is from the input connection point a to the diode D8 and then output to the external circuit, the current flows back to the rectifier bridge 110 from the external circuit and sequentially passes through the diode D11 and the input connection point B to the input AC power AC, thereby forming a loop of the input AC power ac→the input connection point a→the diode D8→the external circuit→the diode D11→the input connection point b→the input AC power AC. When the alternating current input into the alternating current power supply AC is in the negative half cycle, the diode D9 and the diode D10 of the rectifier bridge stack 110 are turned on, the diode D8 and the diode D11 are in the off state, and the loop formed is: input AC power AC, input connection point B, diode d10, external circuit, diode d9, input connection point a, input AC power AC. Therefore, the output ends of the cathodes of the diode D8 and the diode D10 are always connected with the input anode of the external circuit, so the connection point of the cathodes is the output anode of the rectifier bridge stack 110, and the connection point of the anodes is the output cathode of the rectifier bridge stack 110, and the AC power input to the AC power supply AC is always output through the output anode after passing through the rectifier bridge stack 110, so that the current direction is kept consistent, the operation of rectifying the AC power into the dc power is completed, but the output dc power still fluctuates along with the change of the AC power, so the power supply module 120 further performs the filtering operation on the dc power through the filtering function of the electrolytic capacitor EC1, and the dc power is output as the smooth dc power.
It should be noted that, the IPM module 130 is an advanced power switching device, and has the advantages of high current density, low saturation voltage and high voltage resistance of the IGBT, and the advantages of high input impedance, high switching frequency and low driving power of the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Moreover, the IPM is internally integrated with logic, control, detection and protection circuits, so that the use is convenient, the volume and development time of the system are reduced, the reliability of the system is greatly enhanced, the IPM is suitable for the development direction of the current power device, namely a modularized, compound and power integrated circuit, and the IPM is more and more widely applied in the power electronics field.
As shown in fig. 1, the method for estimating power of an air conditioner outdoor unit controller according to an embodiment of the present invention may include:
s1, determining an effective value of current consumed by the compressor, and acquiring the running power of the compressor.
Specifically, as shown in fig. 2, an input alternating current power supply AC, a rectifier bridge stack, a power supply module, an IPM module and a compressor motor form a power supply loop, and the current in the loop is collected in real time through a current detection unit in the power supply loop and calculated to obtain the effective value of the current consumed by the compressor
Figure SMS_19
. During the operation of the motor, the data can be collected by the power supply current detection unit and the bus voltage is added to the operation power of the compressor>
Figure SMS_20
And (5) performing calculation.
According to one embodiment of the invention, determining the effective value of the current consumed by the compressor may include: and detecting the current at the input end or the current at the output end of the rectifier bridge stack in the air conditioner external unit to obtain the current effective value consumed by the compressor.
Specifically, when the compressor of the air conditioner external unit is in a normal operation state, an ac power supply voltage is input
Figure SMS_21
Is input with alternating current power supply current>
Figure SMS_22
The waveform of the input AC power supply is shown as figure 4, the maximum value of the input AC power supply is in a constant state, and the current of the input AC power supply is changed into +_in figure 4 after passing through the rectifier bridge stack>
Figure SMS_23
The waveform diagram shown, i.e. the dc power of the waveform. Therefore, the power supply current detection unit may be disposed between the rectifier bridge stack and the power supply module as shown in fig. 2, that is, detect the current at the output end of the rectifier bridge stack, or may be disposed between the rectifier bridge stack and the input ac power supply as shown in fig. 3, and near one side of the rectifier bridge, that is, detect the current at the input end of the rectifier bridge stack. />
According to one embodiment of the present invention, obtaining the operating power of the compressor may include: determining d-axis current and q-axis current of the compressor, and determining d-axis voltage and q-axis voltage of the compressor; the operating power of the compressor is determined based on the d-axis current and q-axis current of the compressor and the d-axis voltage and q-axis voltage of the compressor.
According to one embodiment of the present invention, determining d-axis current and q-axis current of a compressor includes: and obtaining three-phase current of the compressor, and performing Clark coordinate transformation and Park coordinate transformation on the three-phase current of the compressor to obtain d-axis current and q-axis current of the compressor.
According to one embodiment of the present invention, obtaining three-phase current of a compressor may include: and acquiring any two-phase current of the compressor by using the single-phase current sensor in a time-sharing multiplexing way, and carrying out current reconstruction according to any two-phase current of the compressor to obtain three-phase current of the compressor.
Specifically, the MCU control unit controls the current sensor to sample the three-phase current of the compressor. The current sensor can be a current transformer and a resistor, is connected with an AD detection port of the MCU control unit, converts a current signal into a voltage signal and then transmits the voltage signal to an AD unit connected with the AD detection port in the MCU control unit,and the conversion from an analog voltage signal to a digital signal is realized, and the three-phase current of the motor is obtained. In addition, the current detection unit can also be a circuit sensor, any two-phase current of the compressor is needed to be multiplexed in time when one sensor is used, and current reconstruction is carried out according to any two-phase current of the compressor to obtain the collected motor U/V/W three-phase current
Figure SMS_24
、/>
Figure SMS_25
、/>
Figure SMS_26
。
As shown in fig. 5, the obtained three-phase current of the motor U/V/W
Figure SMS_34
、/>
Figure SMS_42
、/>
Figure SMS_49
Acquisition by conversion of the CLARK transformation>
Figure SMS_29
、/>
Figure SMS_40
Then->
Figure SMS_47
、/>
Figure SMS_54
D-axis current and q-axis current converted into compressor motor by PAPK conversion>
Figure SMS_30
、/>
Figure SMS_38
Then d-axis current of compressor motor +.>
Figure SMS_45
And q-axis current>
Figure SMS_52
. While the three-phase voltage of the compressor is obtained, first the torque is obtained according to the speed loop PI controller>
Figure SMS_33
Obtaining the dq-axis current command of the rotating coordinate system by MTPA control (maximum torque current ratio control)>
Figure SMS_41
、/>
Figure SMS_48
Dq axis current command->
Figure SMS_55
、/>
Figure SMS_28
And d-axis current of compressor motor +.>
Figure SMS_35
And q-axis current>
Figure SMS_43
Obtaining dq voltage command by connecting to dq axis current loop
Figure SMS_50
、/>
Figure SMS_27
Dq axis voltage command ∈ ->
Figure SMS_39
and />
Figure SMS_46
Obtaining an actual voltage instruction after clipping>
Figure SMS_53
and />
Figure SMS_31
Actual voltage command>
Figure SMS_36
and />
Figure SMS_44
Still further according to formula (1) by IPARK into a stationary coordinate system as shown in FIG. 6 +.>
Figure SMS_51
Axle voltage command->
Figure SMS_32
and />
Figure SMS_37
. The formula (1) is:
Figure SMS_56
（1）
then, the method
Figure SMS_57
Shaft voltage->
Figure SMS_58
and />
Figure SMS_59
Conversion by ICLARK command into U, V, W three-phase voltage command +_as shown in fig. 7 according to formula (2)>
Figure SMS_60
、/>
Figure SMS_61
and />
Figure SMS_62
The final motor three-phase voltage command is obtained. The formula (2) is:
Figure SMS_63
（2）
the motor power
Figure SMS_64
The motor three-phase voltage and three-phase current can be obtained through calculation according to a formula (3), and the motor three-phase voltage and three-phase current can also be obtained through calculation according to a formula (4) according to the dq axis voltage and the dq axis current of the dq axis. The formula (3) and the formula (4) are as follows.
Figure SMS_65
（3）/>
wherein ,
Figure SMS_66
for compressor motor power, +.>
Figure SMS_67
、/>
Figure SMS_68
and />
Figure SMS_69
Three-phase voltages of u, v and w of the compressor motor respectively,>
Figure SMS_70
、
Figure SMS_71
、/>
Figure SMS_72
the three-phase currents are u, v and w of the compressor motor respectively;
Figure SMS_73
（4）
wherein ,
Figure SMS_74
、/>
Figure SMS_75
respectively, the dq axis voltage of the compressor motor, < >>
Figure SMS_76
、/>
Figure SMS_77
Respectively compressor motor dq axis current.
In one embodiment of the present invention, as shown in fig. 5, the MCU control unit cannot directly output the UVW three-phase voltage waveform, the output time duty ratio, and the MOD module (duty ratio calculating unit) calculates the duty ratio according to the dc bus voltage Udc. The IPM inverter module outputs an equivalent voltage to the motor according to the UVW three-phase duty cycle and the actual Udc voltage (dc bus voltage). The duty ratio calculation unit performs duty ratio calculation according to the direct current bus voltage and the three-phase voltage command to obtain a duty ratio control signal, namely three-phase exhibition ratios Tu, tv and Tw, and the specific formula is as follows: tu= (vu+0.5 Udc)/Udc; tv= (vv+0.5 Udc)/Udc; tw= (vw+0.5 Udc)/Udc, and the switching of the inverter circuit is controlled by the duty control signal, thereby controlling the motor.
In one embodiment of the present invention, as shown in fig. 2 or 3, the dc bus voltage is detected by a voltage detecting unit disposed between the power supply module and the IPM module, wherein the voltage detecting unit may include a first resistor R1 and a second resistor R2 disposed in series, and the dc bus voltage Udc is obtained by detecting the voltage value between the first resistor R1 and the second resistor R2, udc=u R2 * (R1+R2)/R2, wherein for 220V input AC power supply, the bus voltage after AC-DC rectification is 310V, the DC bus capacitance is usually 450V withstand voltage level, the detection range can be above 450V, the R1/R2 ratio is preferably 100, R1 can be set to 1MΩ and R2 can be set to 10KΩ.
S2, estimating the effective value of the alternating-current power supply voltage according to the effective value of the current consumed by the compressor and the running power of the compressor.
According to one embodiment of the present invention, the ac power supply voltage effective value is estimated by the following equation (5):
Figure SMS_78
（5）
wherein ,
Figure SMS_79
representing the ac mains voltage effective value, +.>
Figure SMS_80
Indicating the operating power of the compressor, +.>
Figure SMS_81
Representing the power factor>
Figure SMS_82
Indicating the effective value of the current consumed by the compressor. Wherein (1)>
Figure SMS_83
The value can be taken according to the actual application situation, and is usually about 0.8.
Specifically, as can be seen from the power calculation formula, the power is equal to the product of the voltage and the current, and therefore, the ac power supply voltage effective value can be calculated from the obtained current effective value consumed by the compressor
Figure SMS_84
And the operating power of the compressor->
Figure SMS_85
The estimation is carried out by the formula (5).
S3, estimating the running power of the external fan according to the effective value of the alternating-current power supply voltage.
Specifically, the operation power of the external fan can be calculated by the formula
Figure SMS_86
An estimate is made of the number of samples, wherein,
Figure SMS_87
representing the running power of the fan of the external machine, +.>
Figure SMS_88
And the effective value of the alternating-current power supply voltage is represented, and a and b are preset coefficients. The power calculation coefficients of the external fan are a and b, and the values of different motors are different, so that the power calculation coefficients are selected according to the actual motor model.
S4, determining the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan.
That is, the total power of the external machine controller is equal to the operation power of the compressor
Figure SMS_89
And the running power of the external machine fan>
Figure SMS_90
The sum, i.e. total power->
Figure SMS_91
。/>
In summary, according to the method for estimating the power of the air conditioner external unit controller provided by the embodiment of the invention, firstly, the effective value of the current consumed by the compressor is determined, the running power of the compressor is obtained, then, the effective value of the alternating-current power supply voltage is estimated according to the effective value of the current consumed by the compressor and the running power of the compressor, then, the running power of the external unit fan is estimated according to the effective value of the alternating-current power supply voltage, and finally, the total power of the external unit controller is determined according to the running power of the compressor and the running power of the external unit fan. Therefore, the method only needs to collect the effective value of the current consumed by the compressor and can estimate the running power of the fan by combining the running power of the compressor, so that the total power of the external controller can be estimated, the circuit structure is simplified, and the cost of the controller is reduced.
Corresponding to the embodiment, the invention also provides an air conditioner external unit controller.
As shown in fig. 8, the outdoor unit controller 200 of the embodiment of the present invention includes a memory 210, a processor 220, and an outdoor unit controller power estimation program stored in the memory 210 and capable of running on the processor 220, where the processor 220 implements the method for estimating the outdoor unit controller power when executing the outdoor unit controller power estimation program.
According to the air conditioner external unit controller provided by the embodiment of the invention, when the processor executes the power estimation program of the air conditioner external unit controller, the power estimation method of the air conditioner external unit controller is realized, and only the power supply voltage or the power supply current is required to be collected, so that the circuit structure is simplified, and the cost of the controller is reduced.
The present invention also proposes a computer-readable storage medium corresponding to the above-described embodiments.
The computer readable storage medium of the embodiment of the invention stores an air conditioner external unit controller power estimation program, and the air conditioner external unit controller power estimation method is realized when the air conditioner external unit controller power estimation program is executed by a processor.
According to the computer readable storage medium, the power estimation method of the air conditioner external unit controller is realized by executing the power estimation program of the air conditioner external unit controller, and only the power supply voltage or the power supply current is required to be collected, so that the circuit structure is simplified, and the cost of the controller is reduced.
Corresponding to the embodiment, the invention also provides a power estimation device of the air conditioner outdoor unit controller.
As shown in fig. 9, the power estimation device for an air conditioner outdoor unit controller according to an embodiment of the present invention may include: a current determination module 10, a compressor power acquisition module 20, a voltage estimation module 30, a fan power estimation module 40, and a power determination module 50.
Wherein the current determination module 10 is configured to determine an effective value of current consumed by the compressor. The compressor power harvesting module 20 is configured to harvest operating power of the compressor. The voltage estimation module 30 is used for estimating the effective value of the alternating current power supply voltage according to the effective value of the current consumed by the compressor and the running power of the compressor. The fan power estimation module 40 is configured to estimate the operating power of the external fan according to the effective value of the ac power supply voltage. The power determination module 50 is configured to determine the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan.
Specifically, as shown in fig. 2, an alternating current power source AC, a rectifier bridge stack is inputThe power supply loop is formed by the power supply module, the IPM module and the compressor motor, and the current in the loop is acquired in real time through the current determining module 10 in the power supply loop and calculated to obtain the effective value of the current consumed by the compressor
Figure SMS_92
. During operation of the motor, data can be recorded by the current determination module 10 and the bus voltage can be used to add to the operating power of the compressor>
Figure SMS_93
And (5) performing calculation.
When the compressor of the air conditioner external unit is in a normal running state, an alternating current power supply voltage is input
Figure SMS_94
Is input with alternating current power supply current>
Figure SMS_95
The waveform of the input AC power supply is shown as figure 4, the maximum value of the input AC power supply is in a constant state, and the current of the input AC power supply is changed into +_in figure 4 after passing through the rectifier bridge stack>
Figure SMS_96
The waveform diagram shown, i.e. the dc power of the waveform. Therefore, the current determining module 10 may be disposed between the rectifier bridge and the power supply module as shown in fig. 2, that is, detect the current at the output end of the rectifier bridge, or as shown in fig. 3, the current determining module 10 may also be disposed between the rectifier bridge and the input ac power source and near one side of the rectifier bridge, that is, detect the current at the input end of the rectifier bridge. />
When the current determining module 10 is a current sensor, the MCU control unit controls the current sensor to sample three-phase current of the compressor. The current sensor can be of a current transformer and a resistor, is connected with an AD detection port of the MCU control unit, converts a current signal into a voltage signal and then transmits the voltage signal to an AD unit connected with the AD detection port in the MCU control unit, realizes conversion from an analog voltage signal to a digital signal, and obtains three phases of the motorA current. In addition, the current detection unit can also be a circuit sensor, any two-phase current of the compressor is needed to be multiplexed in time when one sensor is used, and current reconstruction is carried out according to any two-phase current of the compressor to obtain the collected motor U/V/W three-phase current
Figure SMS_97
、/>
Figure SMS_98
、/>
Figure SMS_99
。
As shown in fig. 5, the motor U/V/W three-phase current acquired by the compressor power acquisition module 20
Figure SMS_106
、/>
Figure SMS_112
、/>
Figure SMS_120
Acquisition by conversion of the CLARK transformation>
Figure SMS_102
、/>
Figure SMS_109
Then->
Figure SMS_118
、/>
Figure SMS_124
D-axis current and q-axis current converted into compressor motor by PAPK conversion>
Figure SMS_101
、
Figure SMS_113
Then d-axis current of compressor motor +.>
Figure SMS_117
And q-axis current>
Figure SMS_125
. While the three-phase voltage of the compressor is obtained, first the torque is obtained according to the speed loop PI controller>
Figure SMS_107
Obtaining the dq-axis current command of the rotating coordinate system by MTPA control (maximum torque current ratio control)>
Figure SMS_111
、/>
Figure SMS_119
Dq axis current command->
Figure SMS_126
、/>
Figure SMS_105
And d-axis current of compressor motor +.>
Figure SMS_108
And q-axis current>
Figure SMS_116
Obtaining the dq voltage command +.>
Figure SMS_123
、/>
Figure SMS_100
Dq axis voltage command ∈ ->
Figure SMS_114
and />
Figure SMS_121
Obtaining an actual voltage instruction after clipping>
Figure SMS_127
and />
Figure SMS_103
Actual voltage command>
Figure SMS_115
and />
Figure SMS_122
Still further according to formula (1) by IPARK into a stationary coordinate system as shown in FIG. 6 +.>
Figure SMS_128
Axle voltage command->
Figure SMS_104
and />
Figure SMS_110
. The formula (1) is:
Figure SMS_129
（1）
then, the method
Figure SMS_130
Shaft voltage->
Figure SMS_131
and />
Figure SMS_132
Conversion by ICLARK command into U, V, W three-phase voltage command +_as shown in fig. 7 according to formula (2)>
Figure SMS_133
、/>
Figure SMS_134
and />
Figure SMS_135
The final motor three-phase voltage command is obtained. The formula (2) is:
Figure SMS_136
（2）
the motor power
Figure SMS_137
The motor three-phase voltage and three-phase current can be obtained through calculation according to a formula (3), and the motor three-phase voltage and three-phase current can also be obtained through calculation according to a formula (4) according to the dq axis voltage and the dq axis current of the dq axis. The formula (3) and the formula (4) are as follows.
Figure SMS_138
（3）
wherein ,
Figure SMS_139
for compressor motor power, +.>
Figure SMS_140
、/>
Figure SMS_141
and />
Figure SMS_142
Three-phase voltages of u, v and w of the compressor motor respectively,>
Figure SMS_143
、
Figure SMS_144
、/>
Figure SMS_145
the three-phase currents are u, v and w of the compressor motor respectively;
Figure SMS_146
（4）
wherein ,
Figure SMS_147
、/>
Figure SMS_148
respectively, the dq axis voltage of the compressor motor, < >>
Figure SMS_149
、/>
Figure SMS_150
Respectively compressor motor dq axis current.
As can be seen from the power calculation formula, the power is equal to the product of the voltage and the current, and therefore, the effective value of the AC power supply voltage can be obtained according to the obtained effective value of the current consumed by the compressor
Figure SMS_151
And the operating power of the compressor->
Figure SMS_152
The estimation is carried out by the formula (5). />
Figure SMS_153
（5）
The fan power estimation module 40 passes the formula
Figure SMS_154
Estimating the power of an external fan, wherein +.>
Figure SMS_155
Representing the running power of the fan of the external machine, +.>
Figure SMS_156
And the effective value of the alternating-current power supply voltage is represented, and a and b are preset coefficients. The power calculation coefficients of the external fan are a and b, and the values of different motors are different, so that the power calculation coefficients are selected according to the actual motor model.
The power determination module 50 determines the operating power of the compressor
Figure SMS_157
And the running power of the external machine fan>
Figure SMS_158
The sum obtains the total power, i.e. total power->
Figure SMS_159
。
It should be noted that, for details not disclosed in the power estimation device of the air conditioner external unit controller in the embodiment of the present invention, please refer to details disclosed in the power estimation method of the air conditioner external unit controller in the above embodiment of the present invention, and details are not described here again.
In summary, according to the power estimation device for the air conditioner external unit controller provided by the embodiment of the invention, the current effective value consumed by the compressor is determined through the current determination module, the operation power of the compressor is obtained through the compressor power acquisition module, the alternating current power supply voltage effective value is estimated through the voltage estimation module according to the current effective value consumed by the compressor and the operation power of the compressor, the alternating current power supply voltage effective value is estimated through the fan power estimation module according to the current effective value consumed by the compressor and the operation power of the compressor, and the total power of the external unit controller is determined through the power determination module according to the operation power of the compressor and the operation power of the external unit fan. Therefore, the device only needs to collect the effective value of the current consumed by the compressor and can estimate the running power of the fan by combining the running power of the compressor, so that the total power of the external controller can be estimated, the circuit structure is simplified, and the cost of the controller is reduced.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may 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. For example, if implemented in hardware, as in another embodiment, 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.
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.

Claims (8)

1. An air conditioner outdoor unit controller power estimation method is characterized by comprising the following steps:
determining an effective value of current consumed by a compressor, and obtaining the running power of the compressor;
estimating an ac power supply voltage effective value according to the current effective value consumed by the compressor and the operation power of the compressor;
estimating the running power of the external fan according to the effective value of the alternating current power supply voltage;
determining the total power of an external machine controller according to the operation power of the compressor and the operation power of the external machine fan;
wherein the ac supply voltage effective value is estimated by the following formula:
Figure QLYQS_1
wherein ,
Figure QLYQS_2
representing the ac mains voltage effective value, a ∈>
Figure QLYQS_3
Representing the operating power of the compressor, +.>
Figure QLYQS_4
Representing the power factor>
Figure QLYQS_5
Representing the effective value of the current consumed by the compressor.
2. The method of claim 1, wherein deriving operating power of the compressor comprises:
determining d-axis current and q-axis current of the compressor, and determining d-axis voltage and q-axis voltage of the compressor;
and determining the operation power of the compressor according to the d-axis current and the q-axis current of the compressor and the d-axis voltage and the q-axis voltage of the compressor.
3. The method of claim 2, wherein determining d-axis current and q-axis current of the compressor comprises:
and obtaining the three-phase current of the compressor, and performing Clark coordinate transformation and Park coordinate transformation on the three-phase current of the compressor to obtain the d-axis current and the q-axis current of the compressor.
4. A method according to claim 3, wherein obtaining three-phase current of the compressor comprises:
and acquiring any two-phase current of the compressor through time-sharing multiplexing of the single-phase current sensor, and carrying out current reconstruction according to any two-phase current of the compressor to obtain three-phase current of the compressor.
5. The method of claim 1, wherein determining an effective value of current consumed by the compressor comprises:
and detecting the current of the input end or the current of the output end of the rectifier bridge stack in the air conditioner external unit to obtain the current effective value consumed by the compressor.
6. An air conditioner external unit controller, characterized by comprising a memory, a processor and an air conditioner external unit controller power estimation program stored on the memory and capable of running on the processor, wherein the processor realizes the air conditioner external unit controller power estimation method according to any one of claims 1-5 when executing the air conditioner external unit controller power estimation program.
7. A computer-readable storage medium, having stored thereon an air conditioner external controller power estimation program which, when executed by a processor, implements the air conditioner external controller power estimation method according to any one of claims 1 to 6.
8. An air conditioner outdoor unit controller power estimation device, comprising:
the current determining module is used for determining the effective value of the current consumed by the compressor;
the compressor power acquisition module is used for acquiring the running power of the compressor;
the voltage estimation module is used for estimating the effective value of the alternating-current power supply voltage according to the effective value of the current consumed by the compressor and the running power of the compressor;
the fan power estimation module is used for estimating the running power of the external fan according to the effective value of the alternating-current power supply voltage;
the power determining module is used for determining the total power of the external machine controller according to the operation power of the compressor and the operation power of the external machine fan;
wherein, the voltage estimation module estimates the effective value of the alternating current power supply voltage through the following formula:
Figure QLYQS_6
wherein ,
Figure QLYQS_7
representing the ac mains voltage effective value, a ∈>
Figure QLYQS_8
Representing the operating power of the compressor, +.>
Figure QLYQS_9
Representing the power factor>
Figure QLYQS_10
Representing the effective value of the current consumed by the compressor. />
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