CN111102683A - Power factor improving method and system and control method of variable frequency air conditioner - Google Patents

Power factor improving method and system and control method of variable frequency air conditioner Download PDF

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CN111102683A
CN111102683A CN201911381455.1A CN201911381455A CN111102683A CN 111102683 A CN111102683 A CN 111102683A CN 201911381455 A CN201911381455 A CN 201911381455A CN 111102683 A CN111102683 A CN 111102683A
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pfc
indoor unit
current
whole machine
action
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CN111102683B (en
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龚诣恒
张旻
甲斐昭裕
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Shanghai Mitsubishi Electric and Shangling Air Conditioner and Electric Appliance Co Ltd
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Shanghai Mitsubishi Electric and Shangling Air Conditioner and Electric Appliance 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
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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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)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Rectifiers (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a power factor improving method of a variable frequency air conditioner, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a plurality of indoor units, the carrying conditions of reactors of each indoor unit are the same or different, and the inductance values of the carried reactors are the same or different; wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle. The advantages are that: the effect of improving the power factor is achieved.

Description

Power factor improving method and system and control method of variable frequency air conditioner
Technical Field
The invention relates to the technical field of air conditioner products, in particular to a method, a system and a control method for improving Power Factor Correction (PFC) of a variable frequency air conditioner, which is a method for restraining distortion of current waveform and improving Power Factor.
Background
In air conditioner products, there are several situations: 1. the indoor unit uses a DC motor, and a reactor is added for taking measures against higher harmonics; 2. in order to achieve high static pressure of the built-in indoor unit, a reactor with large inductance is used; 3. in a multi-split system, there are many ways of combining indoor units each equipped with a reactor in parallel.
Based on the above reasons, because the indoor unit has the reactor, and the inductance is large, a phase difference exists between the current of the whole machine and the voltage of the whole machine, the power factor is deteriorated, the larger the angle of the phase difference is, the worse the power factor is, and the lower the active power of the whole machine is, so that the electric energy utilization efficiency is low, and therefore a technical implementation scheme for effectively reducing the phase difference between the voltage of the whole machine and the current of the whole machine so as to achieve the effect of improving the power factor is required to be provided.
Regarding the application of PFC in the case of an indoor unit without a reactor, as shown in fig. 1, it is an outdoor unit voltage and current waveform diagram in the case of an indoor unit without a reactor, in which the indoor unit can be regarded as a pure resistive load, there is no phase difference between the outdoor voltage and the outdoor current, the phase difference (Φ) is 0, and at this time, the power factor (cos Φ) of the entire unit is 1, and in the diagram:
PFC ON start time: the time difference between the voltage/current zero crossing and the rising edge of the fixed PFC action;
fixing PFC action: in a sine wave of one period of alternating current, after waiting for PFC ON starting time every time a voltage zero crossing point is detected, starting PFC action;
in the case where the indoor unit does not have a reactor, the "fixed PFC operation" of the outdoor unit is to increase the bus voltage and reduce harmonics, and the "PFC ON start time" and the number of "PFC operation" are set to be fixed;
FIG. 2 is a system diagram showing the existence of reactors in the indoor units connected to the outdoor unit, showing the connection mode between one outdoor unit and a plurality of indoor units with reactors, as shown in FIG. 3, the relation between the total machine current and the outdoor unit current and the indoor unit current, i.e. the total machine current is equal to the sum i of the outdoor unit current and the indoor unit currents＝iInner part+iOuter cover；
Based on the above situation, because there is a reactor in the indoor units connected to the outdoor unit, the overall current lags the overall voltage, and with reference to fig. 4, taking three indoor units with reactors as an example (there may be more indoor units in an actual air conditioning system), the following is calculated:
Figure BDA0002342367490000021
Figure BDA0002342367490000022
can be processed by the same method to obtain IB、IC、φB、φC：
IS＝IA+IB+IC+IOuter cover
Figure BDA0002342367490000023
Figure BDA0002342367490000024
Wherein L is an inductor (H), XLInductive reactance (omega), phi is phase difference (degree);
as shown in the current vector diagram of fig. 5, the phase angle between the current of the indoor unit and the voltage of the indoor unit is larger as the reactor of the indoor unit is larger and the load of the indoor unit is larger, and it can be seen from the diagram that as the number of indoor units equipped with the reactor is increased (as the number of indoor units is increased or the reactor of the indoor unit is larger) or the phi angle of the indoor unit is larger, the phi angle of the overall unit current lagging the overall unit voltage is larger, and the power factor is more seriously deteriorated.
Disclosure of Invention
The invention aims to provide a power factor improving method, a system and a control method of a variable frequency air conditioner.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a power factor improving method of a variable frequency air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a plurality of indoor units, and the carrying conditions of reactors of each indoor unit are the same or different, and the method is characterized in that:
under the condition that an indoor unit is provided with a reactor, an outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle;
wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the additional PFC action is completed within the phase difference between the voltage zero crossing point of the whole machine and the current zero crossing point of the whole machine.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the outdoor unit presets information of different indoor unit combination modes and corresponding correlation modes of additional PFC actions;
the different indoor unit combination modes are as follows: the number of the indoor units and different arrangement combinations of the carrying conditions of the reactors of each indoor unit;
the relevant modes of additional PFC action refer to: duration and number of PFC actions.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the larger the phase difference between the voltage zero crossing point of the whole machine and the current zero crossing point of the whole machine is, the more the duration and the times of the additional PFC action are.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the total inductance of the reactor is adapted to the turn-on time of the additional PFC action, and the total inductance and the turn-on time are positively correlated.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the number of additional PFC actions is increased and the turn-on time of the additional PFC actions is reduced to make the current waveform smoother so as to protect the circuit.
The power factor improving method of the variable frequency air conditioner comprises the following steps:
the number of reactors is adapted to the number of times of additional PFC actions or the on-time of the additional PFC actions, and the two are positively correlated.
An air conditioning system having a power factor improving function, comprising:
the indoor unit comprises a plurality of indoor units, and the carrying conditions of reactors of the indoor units are the same or different;
the outdoor unit comprises a control unit and a PFC loop; under the condition that an indoor unit is provided with a reactor, a control unit controls a PFC loop to add PFC action in a positive half cycle and/or a negative half cycle of at least one voltage cycle to reduce the phase difference between a complete machine voltage zero crossing point and a complete machine current zero crossing point; wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
The air conditioning system with power factor improving function, wherein:
the indoor unit also comprises a first communication unit for communicating the indoor unit combination mode to the outdoor unit;
the outdoor unit also comprises a second communication unit for receiving the combination mode of the indoor unit; information of different indoor unit combination modes and corresponding additional PFC action modes are preset in a control chip of the outdoor unit; and the control unit searches a corresponding additional PFC action relevant mode according to the current indoor unit combination mode and controls the PFC loop to carry out the corresponding additional PFC action.
A control method of an air conditioning system is characterized by comprising the following steps:
the outdoor unit and the indoor unit establish communication, and the outdoor unit receives electric reactor information transmitted by the indoor unit;
under the condition that the indoor unit does not have a reactor, the outdoor unit does not have additional PFC action;
under the condition that the indoor unit is provided with the reactor, the outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle; wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
Compared with the prior art, the invention has the following advantages: under the condition that an indoor unit is provided with a reactor, the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine is reduced by the additional PFC action of raising the positive current of the whole machine in a positive half cycle and/or raising the negative current of the whole machine in a negative half cycle of the outdoor unit, so that the effect of improving the power factor is achieved.
Drawings
FIG. 1 is a voltage and current waveform diagram of an outdoor unit in the situation that an indoor unit has no reactor;
fig. 2 is a system diagram showing the presence of a reactor in an indoor unit connected to an outdoor unit;
FIG. 3 is a graph showing the relationship between the current of the whole unit and the current of the outdoor unit and the current of the indoor unit;
FIG. 4 is a graph of the current relationship for an air conditioning system (comprising three indoor units);
FIG. 5 is a current vector diagram of an air conditioning system;
FIG. 6 is a graph of the current-voltage waveform of an air conditioning system without additional PFC action;
FIG. 7 is a graph of the current-voltage waveform of an air conditioning system with additional PFC action after the method of the present invention is applied:
fig. 8 is a table showing information on different combinations of the indoor units and corresponding associated modes for additional PFC operation according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating an operation of the air conditioning system according to the embodiment of the present invention.
Detailed Description
The present invention will now be further described by way of the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings.
Generally, an air conditioning system includes an indoor unit and an outdoor unit as shown in fig. 2, the indoor unit includes a plurality of indoor units, when the system is in operation, if the current of the whole unit lags behind the voltage of the whole unit by a certain angle between the zero-crossing point of the voltage of the whole unit and the zero-crossing point of the current of the whole unit (the angle is a phase difference), when the voltage is inconsistent with the current phase, inductive reactive power occurs, and the whole unit cannot effectively convert the electric energy into the mechanical energy of the motor, because the reactor loading conditions of each indoor unit in the actual indoor unit are the same or different (the reactor is loaded or not loaded, and the inductance of the reactor is the same or different), therefore, under the condition that the system has no reactor, the current-voltage waveform diagram is as shown in fig. 1, the zero-crossing point of the voltage of the whole unit and, the phase difference exists between the voltage zero crossing point of the whole machine and the current zero crossing point of the whole machine, so that the problem of power factor variation exists.
Based on the above problems, the invention provides a method for improving the power factor of a variable frequency air conditioner, which comprises the following steps: under the condition that an indoor unit is provided with a reactor, an outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle; wherein the additional PFC action refers to: in the phase difference of the positive half cycle, the current of the whole machine is negative current, the voltage of the whole machine is positive voltage, and the PFC action is added to improve the current of the whole machine (specifically, the positive current of the outdoor unit is improved), so that the phase difference angle between the current of the whole machine and the voltage of the whole machine is reduced, and the power factor is improved; in the phase difference of the negative half cycle, the overall current is a positive current, the overall voltage is a negative voltage, and the PFC is added to reduce the overall current (specifically, the negative current of the outdoor unit is raised), so that the phase difference angle between the overall current and the overall voltage is reduced, the power factor is improved, and the specific effect can be seen in fig. 7.
It is worth noting that, because the current of the whole machine is in phase with the voltage of the whole machine outside the phase difference, the effect of improving the additional PFC action without power factor is achieved, and therefore the additional PFC action is completed in the phase difference to be the best.
The method can be implemented by a system, specifically, in an air conditioning system, setting a first communication unit in an indoor unit, and setting a second communication unit in an outdoor unit including a control unit (in an outdoor unit substrate control chip) and a PFC loop, wherein the control unit of the outdoor unit is pre-recorded with preset information, and the preset information includes information of different indoor unit combination modes (different arrangement combinations of the number of indoor units and the carrying condition of an electric reactor of each indoor unit) and corresponding additional PFC operation modes (duration and times of PFC operation). The first communication unit is used for sending an indoor unit combination mode (whether an electric reactor of the indoor unit exists or not and electric reactor sampling (inductance value size) information) to the second communication unit of the outdoor unit), and the control unit searches a corresponding additional PFC action correlation mode according to the current indoor unit combination mode and controls the PFC loop to carry out corresponding additional PFC action.
The present invention further provides an air conditioning system control method, and a specific flowchart can be shown in fig. 9, which includes:
the outdoor unit and the indoor unit establish communication, and the outdoor unit receives electric reactor information transmitted by the indoor unit;
under the condition that the indoor unit does not have a reactor, the outdoor unit does not have additional PFC action;
under the condition that the indoor unit is provided with the reactor, the outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle; wherein the additional PFC action refers to: raising the positive current of the whole machine in a positive half cycle and/or raising the negative current of the whole machine in a negative half cycle; specifically, when the outdoor unit has the preset information, the outdoor unit performs the additional PFC action according to the preset information, and when the outdoor unit does not have the preset information, the outdoor unit does not perform the additional PFC action.
In this embodiment, as shown in fig. 2, the control substrate of the outdoor unit includes: the diode bridge DB is used for rectifying and converting alternating current input by a power supply into direct current to be output; the reactor DCL plays a role in energy storage; the insulated gate bipolar transistor IGBT plays a role of a contactless switch; a diode D allowing only a single-direction current to flow by utilizing its forward direction; the capacitor C smoothes the capacitance to further smooth the dc voltage, thereby constituting a PFC circuit. The IGBT loads driving signals with different frequencies, so that the PFC loop can improve the power factor of the whole air conditioner. The control substrate is also provided with a primary voltage detection loop, namely, each time the input voltage of the outdoor unit passes through a zero crossing point, a control chip in the control substrate can obtain feedback, the function can be realized through a plurality of groups of comparators, the comparators output high level in the positive half cycle of the alternating current, and the comparators output low level in the negative half cycle of the alternating current. After receiving the zero crossing point signal, the control chip outputs high level through other pins of the control chip to control the switching frequency (corresponding to the number of times of PFC actions) and the duty ratio (corresponding to the duration time of the PFC actions) of the IGBT, so that the additional PFC actions are realized, and when the voltage of the outdoor unit is in a positive half cycle, the forward input current for switching on the outdoor unit by the IGBT module is increased. When the voltage of the outdoor unit is negative for half a cycle, the negative input current of the outdoor unit is increased when the IGBT module turns on the outdoor unit.
In this embodiment, as shown in fig. 8, the preset information is obtained by measuring a phase difference between the overall voltage and the overall current according to a high-resolution oscilloscope and then combining with a calculation design of a phase difference, and a general rule is that the larger the phase difference between the overall voltage zero-crossing point and the overall current zero-crossing point is, the more the duration and the number of times of the additional PFC action are, and a further optimal design scheme is summarized as follows:
1. compared with NO.1, NO.2, NO.3 and NO.6, when the indoor unit is provided with the reactor, the additional PFC action is implemented, the larger the inductance of the reactor is, the longer the on-time of the additional PFC action can be, namely, the total inductance of the reactor is adapted to the on-time of the additional PFC action, and the positive correlation is realized between the total inductance of the reactor and the on-time of the additional PFC action;
2. the comparison between No.3 and No.4 or between No.7 and No.8 shows that, when the indoor units have the same reactor, the number of times of additional PFC operation can be increased to reduce the on-time of the additional PFC operation. The current waveform can be smoother, and the effect of protecting the circuit is achieved;
3. as is clear from comparison between No.3 and No.5 and No.8, when the indoor unit has the reactor, the number of times of additional PFC operation increases or the on time of the additional PFC operation increases as the number of reactors installed in the indoor unit increases, that is, the number of reactors matches the number of times of the additional PFC operation or the on time of the additional PFC operation, and the two are positively correlated.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (10)

1. A power factor improving method of a variable frequency air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a plurality of indoor units, and the carrying conditions of reactors of each indoor unit are the same or different, and the method is characterized in that:
under the condition that an indoor unit is provided with a reactor, an outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle;
wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
2. The method for improving power factor of an inverter air conditioner according to claim 1, wherein:
the additional PFC action is completed within the phase difference between the voltage zero crossing point of the whole machine and the current zero crossing point of the whole machine.
3. The power factor improving method of an inverter air conditioner according to claim 1 or 2, characterized in that:
the outdoor unit presets information of different indoor unit combination modes and corresponding correlation modes of additional PFC actions;
the different indoor unit combination modes are as follows: the number of the indoor units and different arrangement combinations of the carrying conditions of the reactors of each indoor unit;
the relevant modes of additional PFC action refer to: duration and number of PFC actions.
4. The power factor improving method of an inverter air conditioner according to claim 3, wherein:
the larger the phase difference between the voltage zero crossing point of the whole machine and the current zero crossing point of the whole machine is, the more the duration and the times of the additional PFC action are.
5. The power factor improving method of an inverter air conditioner according to claim 3, wherein:
the total inductance of the reactor is adapted to the turn-on time of the additional PFC action, and the total inductance and the turn-on time are positively correlated.
6. The power factor improving method of an inverter air conditioner according to claim 3, wherein:
the number of additional PFC actions is increased and the turn-on time of the additional PFC actions is reduced to make the current waveform smoother so as to protect the circuit.
7. The power factor improving method of an inverter air conditioner according to claim 3, wherein:
the number of reactors is adapted to the number of times of additional PFC actions or the on-time of the additional PFC actions, and the two are positively correlated.
8. An air conditioning system having a power factor improving function, comprising:
the indoor unit comprises a plurality of indoor units, and the carrying conditions of reactors of the indoor units are the same or different;
the outdoor unit comprises a control unit and a PFC loop; under the condition that an indoor unit is provided with a reactor, a control unit controls a PFC loop to add PFC action in a positive half cycle and/or a negative half cycle of at least one voltage cycle to reduce the phase difference between a complete machine voltage zero crossing point and a complete machine current zero crossing point; wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
9. An air conditioning system with power factor improvement function according to claim 8, characterized in that:
the indoor unit also comprises a first communication unit for communicating the indoor unit combination mode to the outdoor unit;
the outdoor unit also comprises a second communication unit for receiving the combination mode of the indoor unit; information of different indoor unit combination modes and corresponding additional PFC action modes are preset in a control chip of the outdoor unit; and the control unit searches a corresponding additional PFC action relevant mode according to the current indoor unit combination mode and controls the PFC loop to carry out the corresponding additional PFC action.
10. An air conditioning system control method is characterized in that:
the outdoor unit and the indoor unit establish communication, and the outdoor unit receives electric reactor information transmitted by the indoor unit;
under the condition that the indoor unit does not have a reactor, the outdoor unit does not have additional PFC action;
under the condition that the indoor unit is provided with the reactor, the outdoor unit reduces the phase difference between the voltage zero-crossing point of the whole machine and the current zero-crossing point of the whole machine by adding PFC action to the positive half cycle and/or the negative half cycle in at least one voltage cycle; wherein the additional PFC action refers to: and raising the positive current of the whole machine in the positive half cycle and/or raising the negative current of the whole machine in the negative half cycle.
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