Compressor and control method and device thereof, air conditioner, storage medium and program product

Abstract

The invention discloses a compressor and a control method and device thereof, an air conditioner, a storage medium and a computer program product, the compressor is provided with a winding unit and a switching device, and the winding unit is provided with at least two windings; the method comprises the steps that system parameters of a system where the compressor is located are obtained, the operation frequency of the compressor is obtained, and the output voltage of an inverter in the driving end of the compressor is obtained; according to the system parameters, whether the winding switching condition of the compressor is met or not is determined; and if it is determined that the winding switching condition of the compressor is met, the operation frequency of the compressor and the output voltage of an inverter are adjusted, and a switching device is controlled to work, so that the winding participating in work in the winding unit is switched from the current winding to the target winding. According to the scheme, when the compressor needs to be subjected to winding switching, the operation frequency of the compressor and the output voltage of the inverter are adjusted, winding switching is carried out under the condition that the compressor does not stop, and the operation reliability of the compressor and the user experience are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and specifically relates to a compressor control method, device, compressor, air conditioner, storage medium and computer program product, and more particularly to a compressor winding switching control method, device, compressor, air conditioner, storage medium and computer program product. Background Art

[0002] The compressor's windings, or the windings of the motor within it, are known as switching-winding motors. Switching-winding motors offer the advantages of high back-EMF at low frequencies and high efficiency, and low back-EMF at high frequencies and high operating frequencies.

[0003] In some solutions, the compressor's winding switching control is performed by shutting down the compressor before switching windings, then restarting it with the new motor connection. The biggest advantage of this shutdown switching approach is that it ensures switching reliability. However, if the compressor is restarted after shutting down and switching windings, system pressure imbalance may cause restart failure.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The object of the present invention is to provide a control method, device, compressor, air conditioner, storage medium and computer program product for a compressor, so as to solve the problem that when the compressor is shut down and the winding is switched, it will restart again, and if the system pressure is unbalanced, it will cause restart failure. When the compressor needs to switch the winding, the operating frequency of the compressor and the output voltage of the inverter are adjusted to achieve winding switching without stopping the compressor, avoiding restart failure caused by the compressor being shut down and the winding being switched and then restarted again, thereby improving the operating reliability of the compressor and the user experience.

[0006] The present invention provides a control method for a compressor, wherein the compressor has a winding unit and a switching device, wherein the winding unit has at least two windings, and the switching device is used to switch the winding involved in the work in the winding unit from the current winding to the target winding; the control method for the compressor includes: obtaining system parameters of the system in which the compressor is located, obtaining the operating frequency of the compressor, and obtaining the output voltage of the inverter in the driving end of the compressor; determining whether the winding switching condition of the compressor has been met based on the system parameters of the system in which the compressor is located; if it is determined that the winding switching condition of the compressor has been met, adjusting the operating frequency of the compressor and the output voltage of the inverter, and controlling the operation of the switching device to switch the winding involved in the work in the winding unit from the current winding to the target winding.

[0007] In some embodiments, determining whether the winding switching condition of the compressor has been met based on the system parameters of the system where the compressor is located includes: determining whether the system parameters of the system where the compressor is located have reached a set parameter threshold; if it is determined that the system parameters of the system where the compressor is located have reached the set parameter threshold, determining that the winding switching condition of the compressor has been met; if it is determined that the system parameters of the system where the compressor is located have not reached the set parameter threshold, determining that the winding switching condition of the compressor has not been met.

[0008] In some embodiments, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding, including: adjusting the operating frequency of the compressor; then, issuing a winding switching instruction; controlling the switching device to operate according to the winding switching instruction; and adjusting the output voltage of the inverter; controlling the control parameters of the compressor to switch from the parameters for controlling the current winding to the parameters for controlling the target winding, thereby completing the winding switching control of switching the winding involved in the work in the winding unit from the current winding to the target winding.

[0009] In some embodiments, adjusting the operating frequency of the compressor includes: determining whether the operating frequency of the compressor is within a set frequency range; if it is determined that the operating frequency of the compressor is within the set frequency range, determining that the adjustment of the operating frequency of the compressor has been completed; if it is determined that the operating frequency of the compressor is not within the set frequency range, determining whether the operating frequency of the compressor is greater than the upper limit of the set frequency range, and determining whether the operating frequency of the compressor is less than the lower limit of the set frequency range; if it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, controlling the operating frequency of the compressor to decrease to within the set frequency range; if it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range, controlling the operating frequency of the compressor to increase to within the set frequency range.

[0010] In some embodiments, it also includes: when a winding switching instruction is issued, starting timing to obtain a timing time; adjusting the output voltage of the inverter, including: weakening the output voltage of the inverter; determining whether the timing time reaches a set delay time; if it is determined that the timing time reaches the set delay time, determining that the adjustment of the output voltage of the inverter has been completed; if it is determined that the timing time does not reach the set delay time, waiting until the timing time reaches the set delay time; or returning to continue to weaken the output voltage of the inverter until the timing time reaches the set delay time.

[0011] In some embodiments, the output voltage of the inverter is weakened and controlled, including: adjusting the value of the output voltage of the inverter to the product value of the output voltage of the inverter and a set weakening coefficient; the set weakening coefficient is greater than 0 and less than 1.

[0012] In some embodiments, the control parameters of the compressor include: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and at least one of the output voltage of the inverter in the drive end of the compressor; wherein the motor parameters of the motor include: the resistance of the motor, the d-axis and q-axis inductances of the motor, and at least one of the back electromotive force coefficient of the motor; the control loop parameters of the motor include: parameters of the PI module of the speed loop of the motor, parameters of the PI module of the current loop of the motor, and at least one of the parameters of the observer of the motor.

[0013] Matching the above method, the present invention provides a control device for a compressor on the other hand, the compressor having a winding unit and a switching device, the winding unit having at least two windings, and the switching device being used to switch the winding involved in the work in the winding unit from the current winding to the target winding; the control device of the compressor includes: an acquisition unit, configured to acquire system parameters of the system in which the compressor is located, acquire the operating frequency of the compressor, and acquire the output voltage of the inverter in the driving end of the compressor; a control unit, configured to determine whether the winding switching condition of the compressor has been met based on the system parameters of the system in which the compressor is located; the control unit is further configured to adjust the operating frequency of the compressor and the output voltage of the inverter if it is determined that the winding switching condition of the compressor has been met, and control the operation of the switching device to switch the winding involved in the work in the winding unit from the current winding to the target winding.

[0014] In some embodiments, the control unit determines whether the winding switching condition of the compressor has been met based on the system parameters of the system where the compressor is located, including: determining whether the system parameters of the system where the compressor is located have reached a set parameter threshold; if it is determined that the system parameters of the system where the compressor is located have reached the set parameter threshold, then determining that the winding switching condition of the compressor has been met; if it is determined that the system parameters of the system where the compressor is located have not reached the set parameter threshold, then determining that the winding switching condition of the compressor has not been met.

[0015] In some embodiments, the control unit adjusts the operating frequency of the compressor and the output voltage of the inverter, and controls the switching device to switch the winding involved in the work from the current winding to the target winding, including: adjusting the operating frequency of the compressor; then, issuing a winding switching instruction; controlling the switching device to work according to the winding switching instruction; and adjusting the output voltage of the inverter; controlling the control parameters of the compressor from the parameters for controlling the current winding to the parameters for controlling the target winding. At this point, the winding switching control of switching the winding involved in the work in the winding unit from the current winding to the target winding is completed.

[0016] In some embodiments, the control unit adjusts the operating frequency of the compressor, including: determining whether the operating frequency of the compressor is within a set frequency range; if it is determined that the operating frequency of the compressor is within the set frequency range, determining that the adjustment of the operating frequency of the compressor has been completed; if it is determined that the operating frequency of the compressor is not within the set frequency range, determining whether the operating frequency of the compressor is greater than the upper limit of the set frequency range, and determining whether the operating frequency of the compressor is less than the lower limit of the set frequency range; if it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, controlling the operating frequency of the compressor to decrease to within the set frequency range; if it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range, controlling the operating frequency of the compressor to increase to within the set frequency range.

[0017] In some embodiments, it also includes: the control unit is further configured to start timing to obtain a timing time when a winding switching instruction is issued; the control unit adjusts the output voltage of the inverter, including: weakening the output voltage of the inverter; determining whether the timing time reaches the set delay time; if it is determined that the timing time reaches the set delay time, it is determined that the adjustment of the output voltage of the inverter has been completed; if it is determined that the timing time does not reach the set delay time, wait until the timing time reaches the set delay time; or return to continue to weaken the output voltage of the inverter until the timing time reaches the set delay time.

[0018] In some embodiments, the control unit performs weakening control on the output voltage of the inverter, including: adjusting the value of the output voltage of the inverter to the product value of the output voltage of the inverter and a set weakening coefficient; the set weakening coefficient is greater than 0 and less than 1.

[0019] In some embodiments, the control parameters of the compressor include: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and at least one of the output voltage of the inverter in the drive end of the compressor; wherein the motor parameters of the motor include: the resistance of the motor, the d-axis and q-axis inductances of the motor, and at least one of the back electromotive force coefficient of the motor; the control loop parameters of the motor include: parameters of the PI module of the speed loop of the motor, parameters of the PI module of the current loop of the motor, and at least one of the parameters of the observer of the motor.

[0020] Matching the above device, the present invention provides a compressor on another aspect, including: the control device of the compressor described above.

[0021] Matching the above-mentioned device, the present invention provides an air conditioner on another aspect, comprising: the control device of the compressor described above, or the compressor described above.

[0022] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the above-mentioned compressor control method.

[0023] In accordance with the above method, the present invention further provides a computer program product, comprising a computer program, which implements the steps of the above compressor control method when executed by a processor.

[0024] Therefore, the scheme of the present invention is for a compressor with a winding switching function, the compressor has at least two windings (that is, the stator winding of the motor in the compressor is at least two windings, such as a first winding and a second winding), and a switching device for switching between any two windings of the at least two windings to enable the at least two windings to switch and work; after the winding switching condition of the compressor is met, the operating frequency of the compressor is controlled to reach a set frequency range, a switching instruction is issued and timing is started to obtain a timing time; the switching device switches the current winding of the at least two windings (that is, the winding participating in the current work) to the target winding (that is, the winding that the target needs to participate) according to the control instruction; in the process of switching from the current winding to the target winding, the output voltage of the inverter at the driving end of the compressor is voltage-controlled. The first weakened voltage is obtained by weakening control. When the timing time does not reach the set delay time, the output voltage of the inverter at the driving end of the compressor is continuously weakened to obtain a second weakened voltage, or the output voltage of the inverter is maintained at the first weakened voltage, and this cycle is repeated until the timing time reaches the set delay time; when the timing time reaches the set delay time, the control parameters of the motor are switched from the control parameters of the current winding to the control parameters of the target winding; thereby, by adjusting the operating frequency of the compressor and the output voltage of the inverter when the compressor needs to switch the winding, the winding switching can be achieved without stopping the compressor, avoiding the restart failure caused by restarting after the compressor stops and switches the winding, thereby improving the operating reliability of the compressor and the user experience.

[0025] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 1 is a flow chart of an embodiment of a method for controlling a compressor of the present invention;

[0028] Figure 2 1. A flow chart of an embodiment of the method of the present invention for determining whether the winding switching condition of the compressor has been met;

[0029] Figure 3 1. A flow chart of an embodiment of the method of the present invention for adjusting the operating frequency of the compressor and the output voltage of the inverter, and controlling the operation of the switching device;

[0030] Figure 4 1 is a flow chart of an embodiment of the method for adjusting the operating frequency of the compressor in the present invention;

[0031] Figure 5 1 is a flow chart of an embodiment of the method for adjusting the output voltage of the inverter in the present invention;

[0032] Figure 6 1 is a schematic structural diagram of an embodiment of a compressor control device of the present invention;

[0033] Figure 7 1 is a flow chart of an embodiment of a method for controlling winding switching of a compressor according to the present invention;

[0034] Figure 8 Schematic diagram of winding switching current waveform before using a winding switching control method of a compressor of the present invention;

[0035] Figure 9 The figure is a schematic diagram of a winding switching current waveform after using a winding switching control method of a compressor according to the present invention.

[0036] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0037] 102 - acquisition unit; 104 - control unit 104 . DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Consider that if the system pressure is unbalanced after the compressor is shut down and the windings are switched, restarting it may fail. For example, in actual use, after the compressor is shut down, it must wait for the system pressure to balance before restarting, otherwise it may fail to start. In addition, when the compressor is used in air conditioning, this downtime and waiting time can cause indoor temperature fluctuations, seriously affecting the user experience.

[0040] Specifically, compressors with switching windings (i.e., compressors with switching winding motors) are unstable at the moment of winding switching. This, combined with load fluctuations and differences in motor parameters before and after the switching, can easily lead to overcurrent shutdowns and, in severe cases, motor demagnetization. Therefore, a safer and more reliable winding switching method is to shut down the compressor first and then switch. However, after the compressor completes the switching, it must wait for system pressure to balance before restarting; otherwise, it may fail to start. This waiting period can cause indoor temperature fluctuations, seriously affecting the user experience.

[0041] Therefore, the solution of the present invention proposes a compressor control method, specifically a compressor winding switching control method, which can perform winding switching without stopping the compressor, avoiding the waiting process of shutdown and restart and the possibility of startup failure; and when the compressor is used in an air conditioner, it will not cause temperature fluctuations.

[0042] According to an embodiment of the present invention, a method for controlling a compressor is provided. Figure 1 The flowchart of one embodiment of the method of the present invention is shown. The compressor has a winding unit and a switching device (that is, the winding end of the compressor has a winding unit and a switching device), the winding unit has at least two windings, and the switching device is used to switch the winding participating in the work in the winding unit from the current winding to the target winding, the current winding is the winding currently participating in the work in the winding unit, and the target winding is the winding that needs to participate in the work in the future in the winding unit; in the case where at least two windings include a first winding and a second winding, the current winding is such as the first winding, and the target winding is such as the second winding. In the solution of the present invention, as Figure 1 As shown, the compressor control method includes: steps S110 to S130.

[0043] At step S110, system parameters of the system in which the compressor is located are obtained, the operating frequency of the compressor is obtained, and the output voltage of the inverter at the drive end of the compressor is obtained. If the system in which the compressor is located is an air conditioner control system, the system parameters of the compressor system include the indoor and outdoor temperature difference of the air conditioner environment. The drive end of the compressor is the drive system of the motor in the compressor, such as an inverter or a motor controller.

[0044] At step S120, it is determined whether the winding switching condition of the compressor has been met based on the system parameters of the system in which the compressor is located; wherein the winding switching condition of the compressor refers to the condition for switching the winding involved in the work in the winding unit from the current winding to the target winding.

[0045] At step S130, if it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding, thereby achieving the switching of the winding involved in the work in the winding unit from the current winding to the target winding without stopping the compressor.

[0046] The present invention proposes a winding switching control scheme for a switching winding compressor (i.e., a compressor with a switching winding motor), which can perform winding switching without stopping the compressor, avoiding the waiting process of shutdown and restart and the possibility of startup failure, and solving the problem that the compressor may fail to start again due to the load on the system after being shut down; and when the compressor is used in an air conditioner, it will not cause temperature fluctuations, solving the problem of temperature fluctuations caused by shutdown switching.

[0047] In some embodiments, the specific process of determining whether the winding switching condition of the compressor has been met based on the system parameters of the system in which the compressor is located in step S120 is described in the following exemplary embodiments.

[0048] The following combination Figure 2 The flowchart of an embodiment of the method of the present invention for determining whether the winding switching condition of the compressor has been met further illustrates the specific process of determining whether the winding switching condition of the compressor has been met in step S120, including: steps S210 to S230.

[0049] Step S210: determining whether the system parameters of the system where the compressor is located have reached a set parameter threshold.

[0050] In step S220 , if it is determined that the system parameter of the system where the compressor is located has reached a set parameter threshold, it is determined that the winding switching condition of the compressor has been met.

[0051] Step S230: If it is determined that the system parameter of the system where the compressor is located does not reach the set parameter threshold, it is determined that the winding switching condition of the compressor is not met.

[0052] Figure 7 FIG. 1 is a flow chart of an embodiment of a method for controlling winding switching of a compressor according to the present invention. Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps include:

[0053] Step 1: Determine whether the system has reached the switching condition. Only when the system reaches the switching condition will the winding switching control of the compressor be executed.

[0054] Among them, the switching conditions vary according to the different usage scenarios of the compressor. For example: when the compressor is used in an air conditioner, the difference between the set temperature of the indoor environment of the air conditioner and the actual temperature detected can be used as the switching condition. Specifically, when the air conditioner is just turned on, the difference between the set temperature of the indoor environment and the actual temperature detected is large, and the compressor needs to run at a higher frequency. A winding that can make the compressor run at a higher frequency, such as the first winding, can be used to operate; after the air conditioner has been turned on for a period of time, the difference between the set temperature of the indoor environment and the actual temperature detected is small, and the compressor can meet the usage requirements by running at a lower frequency. A winding that can make the compressor run at a lower frequency, such as the first winding, can be used to operate.

[0055] In the solution of the present invention, whether the winding switching condition of the compressor has been met is determined according to the system parameters of the system where the compressor is located. This solution can be applied to different scenarios of the system where the compressor is located. The winding switching timing of the compressor is determined according to the system parameters of the system where the compressor is located in different scenarios of the system where the compressor is located. This solution has a wide range of applications and can achieve accurate judgment for different scenarios. Furthermore, when it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding, thereby achieving the switching of the winding involved in the work in the winding unit from the current winding to the target winding without stopping the compressor, which is beneficial to improving the reliability and stability of the compressor operation, thereby enabling the compressor to operate without stopping to enhance the user experience.

[0056] In some embodiments, in step S130, when it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding. For the specific process, see the following exemplary description.

[0057] The following combination Figure 3 The flowchart of an embodiment of adjusting the operating frequency of the compressor and the output voltage of the inverter and controlling the operation of the switching device in the method of the present invention further illustrates the specific process of adjusting the operating frequency of the compressor and the output voltage of the inverter and controlling the operation of the switching device in step S130, including: steps S310 to S330.

[0058] Step S310, when it is determined that the winding switching condition of the compressor has been met, adjust the operating frequency of the compressor; then, issue a winding switching instruction, and start timing to obtain the timing time; wherein, the winding switching instruction is an instruction for controlling the action of the switching device so that the switching device switches the winding involved in the work in the winding unit from the current winding to the target winding.

[0059] Step S320, controlling the switching device to operate according to the winding switching instruction to switch the working winding in the winding unit from the current winding to the target winding; and in the process of switching the working winding in the winding unit from the current winding to the target winding, adjusting the output voltage of the inverter.

[0060] Step S330, after that, the control parameters of the compressor are switched from the parameters for controlling the current winding to the parameters for controlling the target winding. At this point, the winding switching control of switching the winding involved in the work in the winding unit from the current winding to the target winding is completed.

[0061] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0062] In step 1, when the switching condition is met, the operating frequency of the compressor is first controlled to reach the set frequency range, and then step 2 is executed.

[0063] Step 2: When the rotational speed reaches the set range, that is, when the operating frequency of the compressor reaches the set frequency range, the controller sends a switching instruction to the switching device, and then executes step 3.

[0064] Step 3. The switching device switches the current winding (i.e., the winding participating in the current operation) of at least two windings to the target winding (i.e., the winding that the target needs to participate) according to the control instruction; and, in the process of switching from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is controlled to be weakened, and then the controller-related parameters are updated to the parameters corresponding to the motor state after the switch.

[0065] In the solution of the present invention, after the system where the compressor is located (such as the control system of the air conditioner) reaches the switching conditions, the controller for controlling the compressor (such as the controller of the system where the compressor is located) first controls the operating frequency of the compressor to reach a set frequency range, and then sends a winding switching instruction to the switching device of the compressor winding, so as to ensure that the compressor operates smoothly and safely after the operating frequency of the compressor reaches the set frequency range, and then sends a winding switching instruction, thereby ensuring the smoothness and reliability of the winding switching of the compressor.

[0066] In some embodiments, the specific process of adjusting the operating frequency of the compressor in step S320 is described in the following exemplary embodiments.

[0067] The following combination Figure 4 The flowchart of an embodiment of adjusting the operating frequency of the compressor in the method of the present invention further illustrates the specific process of adjusting the operating frequency of the compressor in step S310, including: steps S410 to S430.

[0068] Step S410: Determine whether the operating frequency of the compressor is within a set frequency range.

[0069] In step S420 , if it is determined that the operating frequency of the compressor is within the set frequency range, it is determined that the adjustment of the operating frequency of the compressor has been completed.

[0070] In step S430, if it is determined that the operating frequency of the compressor is not within the set frequency range, it is determined whether the operating frequency of the compressor is greater than the upper limit of the set frequency range, and whether the operating frequency of the compressor is less than the lower limit of the set frequency range.

[0071] In step S440 , if it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, the operating frequency of the compressor is controlled to be reduced to within the set frequency range.

[0072] In step S450 , if it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range, the operating frequency of the compressor is controlled to increase to within the set frequency range.

[0073] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0074] In step 1, when the switching condition is met, the operating frequency of the compressor is first controlled to reach a set frequency range, and then step 2 is executed to issue a switching instruction.

[0075] The operating frequency of the compressor cannot be too low, otherwise it will easily shut down. For example, the operating frequency of the compressor can be controlled to be between 40Hz and 80Hz.

[0076] In the solution of the present invention, after the switching conditions are met, the controller first controls the operating frequency of the compressor to reach the set frequency range. The set frequency range means that the frequency cannot be too low during switching. By controlling the operating frequency of the compressor to reach the set frequency range, the winding switching is ensured while the compressor is running smoothly.

[0077] In some embodiments, the compressor control method according to the solution of the present invention further includes: when the winding switching instruction is issued, starting the timing to obtain the timing time; preferably, starting the timing to obtain the timing time at the same time as the winding switching instruction is issued;

[0078] For a specific process of adjusting the output voltage of the inverter in the process of switching the working winding in the winding unit from the current winding to the target winding in step S320, refer to the following exemplary description.

[0079] The following combination Figure 5 The flowchart of an embodiment of adjusting the output voltage of the inverter in the method of the present invention further illustrates the specific process of adjusting the output voltage of the inverter in step S320, including steps S510 to S540.

[0080] Step S510 , in the process of switching the working winding in the winding unit from the current winding to the target winding, controlling the output voltage of the inverter to be weakened.

[0081] Step S520: After that, determine whether the timing time reaches the set delay time.

[0082] In step S530 , if it is determined that the timing time reaches the set delay time, it is determined that the adjustment of the output voltage of the inverter has been completed, that is, the adjustment of the output voltage of the inverter is stopped.

[0083] Step S540: If it is determined that the timing time has not reached the set delay time, wait until the timing time reaches the set delay time; or return to continue to weaken the output voltage of the inverter until the timing time reaches the set delay time.

[0084] That is, the control method for the compressor according to the solution of the present invention further includes: when a winding switching instruction is issued, starting a timer to obtain a timer time; preferably, starting a timer to obtain a timer time at the same time as the winding switching instruction is issued; and adjusting the output voltage of the inverter, specifically, adjusting the output voltage of the inverter in combination with the timer time. That is, in the process of switching the working winding in the winding unit from the current winding to the target winding, adjusting the output voltage of the inverter; then, determining whether the timer time has reached a set delay time; if it is determined that the timer time has reached the set delay time, determining that the adjustment of the output voltage of the inverter has been completed, that is, stopping the adjustment of the output voltage of the inverter; if it is determined that the timer time has not reached the set delay time, waiting until the timer time has reached the set delay time; or returning to continue adjusting the output voltage of the inverter until the timer time has reached the set delay time.

[0085] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0086] In step 2, when the speed reaches the set range, that is, when the operating frequency of the compressor reaches the set frequency range, the controller sends a switching instruction to the switching device and simultaneously starts timing to obtain the timing time to start the delay, and then executes step 3. Among them, the control method for the operating frequency of the compressor to reach the set frequency range needs to adopt a corresponding control method according to the high or low operating frequency of the compressor. For example: when the operating frequency of the compressor is high, the operating frequency of the compressor needs to be reduced so that the operating frequency of the compressor reaches the set frequency range; when the operating frequency of the compressor is low, the operating frequency of the compressor needs to be increased so that the operating frequency of the compressor reaches the set frequency range.

[0087] In step 3, the switching device switches the current winding (i.e., the winding participating in the current operation) of at least two windings to the target winding (i.e., the winding that the target needs to participate) according to the control instruction; and, in the process of switching from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is controlled to be weakened, and then step 4 is executed.

[0088] In step 3, after the controller issues a switching command, the inverter output voltage in the compressor drive system is subjected to voltage reduction control and maintained for a predetermined period of time. This voltage reduction control is terminated after the compressor winding switching device completes switching. The voltage reduction control duration is the time from the issuance of the switching command to the completion of the winding switching by the switching device. This duration is related to the response time and operation time of the switching device.

[0089] The compressor winding switching device can be constructed using relays, insulated-gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), or other devices. The compressor winding switching device can employ related switching devices in the art. Different switching devices have different response and actuation times. Generally speaking, relays have millisecond response times, while IGBTs or MOSFETs have microsecond response times. These response and actuation times can be measured in advance.

[0090] Step 4: Determine whether the timed delay has reached the set delay time, i.e., whether the delay has expired. If so, proceed to Step 5; otherwise, continue to wait in Step 4 until the delay expires; or return to Step 3 to continue reducing the output voltage of the inverter at the compressor's drive end during the switching process from the current winding to the target winding until the delay expires. In the solution of the present invention, the inverter output voltage is reduced before the delay expires, and then Step 5 is executed.

[0091] Step 5: Update the controller-related parameters to the parameters corresponding to the motor state after the switch, and then return to step 2 to continue to determine whether the delay has ended. In other words, before the switching device completes the switch, execute step 4 (which can be repeated) and step 5.

[0092] In the solution of the present invention, when a winding switching instruction is issued, timing is started to obtain the timing time; in the process of switching the working winding in the winding unit from the current winding to the target winding, if the timing time does not reach the preset delay time, the output voltage of the inverter is adjusted to stabilize the output voltage of the inverter within a safe range before the winding switching is completed, thereby ensuring the non-stop operation of the compressor on the one hand and the safety of the winding switching on the other hand.

[0093] In some embodiments, the weakening control of the output voltage of the inverter in step S510 and step S540 includes: adjusting the value of the output voltage of the inverter to the product value of the output voltage of the inverter and a set weakening coefficient; the set weakening coefficient is greater than 0 and less than 1.

[0094] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0095] In step 3, assume that the controller calculates the output voltage of the inverter as voltage Vcalc according to a preset control algorithm. A weakening coefficient k is preset. When the controller issues a switching instruction, the actual voltage Vout output by the inverter is Vout = k * Vcalc, where 0 < k < 1. Here, the weakening coefficient k needs to be selected according to the actual situation. If the weakening coefficient k is too small, the suppression effect on the current spike is strong, but it may be prone to shutdown; if the weakening coefficient k is too large, current spikes may occur.

[0096] In the solution of the present invention, when a winding switching instruction is issued, timing is started to obtain a timing time; during the process of switching the winding participating in operation in the winding unit from the current winding to the target winding, when the timing time does not reach the preset delay time, the output voltage of the inverter is weakened and controlled to adjust the output voltage of the inverter, so that the output voltage of the inverter is stabilized within a safe range before the winding switching is completed, ensuring the safety of winding switching under the condition of continuous operation of the compressor.

[0097] In some embodiments, in step S330, when controlling the control parameters of the compressor to be switched from the parameters for controlling the current winding to the parameters for controlling the target winding, the control parameters of the compressor include at least one of the motor parameters of the motor in the compressor, the control loop parameters of the motor in the compressor, and the output voltage of the inverter at the drive end of the compressor.

[0098] Among them, the motor parameters of the motor include at least one of the resistance of the motor, the d-axis and q-axis inductances of the motor, and the back electromotive force coefficient of the motor. The control loop parameters of the motor include at least one of the parameters of the PI module of the speed loop of the motor, the parameters of the PI module of the current loop of the motor, and the parameters of the observer of the motor.

[0099] As Figure 7 shown, a method for controlling winding switching of a compressor proposed by the solution of the present invention further includes the following specific operation steps:

[0100] In the solution of the present invention, in step 5, after the output voltage of the inverter is weakened and controlled, or during the period of weakening and controlling the output voltage of the inverter, the relevant parameters of the controller are also updated to the parameters corresponding to the switched motor state, so that the relevant parameters of the controller are consistent with the control parameters of the switched winding, ensuring the reliability and safety of the switched winding control. The relevant parameters of the controller refer to the relevant control parameters that need to be switched to the control parameters corresponding to the new motor due to the change in the winding connection state of the motor, resulting in a change in the motor parameters.

[0101] Among them, the relevant parameters of the controller generally involve motor parameters and loop control parameters; the motor parameters include resistance, d-axis and q-axis inductance and back-electromotive force coefficient; the loop parameters include the PI (proportional-integral) parameters of the speed loop and current loop and the parameters of the observer.

[0102] Figure 8 FIG. 1 is a schematic diagram of a winding switching current waveform before using a winding switching control method for a compressor of the present invention. Figure 9 FIG1 is a schematic diagram of a winding switching current waveform after using a winding switching control method of a compressor according to the present invention. Figure 8 and Figure 9 The three curves shown are schematic diagrams of the three-phase current waveforms of the compressor. The present invention proposes a winding switching control scheme for a switching winding compressor, which can perform winding switching without stopping the compressor. The switching is smooth and reliable, without current spikes, and is suitable for switching between various types of winding connection forms, that is, suitable for switching motor windings of various connection forms. For example: The present invention proposes a winding switching control scheme for a switching winding compressor, which can be applied to star-delta switching, series-parallel switching and various other combination switching, such as switching between multiple sets of windings, similar to switching from the first winding to the second winding, such as Figure 8 and Figure 9 Shown is the compressor switching current waveform with star-delta switching.

[0103] The present invention proposes a winding switching control scheme for a switching winding compressor, which can realize winding switching without stopping the compressor. There is no current spike during the switching process and no abnormal protection of the controller will be caused. Figure 8 and Figure 9 They are the current waveforms switched at a frequency of 50Hz, Figure 8 There is a significant current spike, which can reach 10.25A; Figure 9 After using the winding switching control method for a compressor of the present invention, the switching is smooth, there is no current spike, and the current spike is effectively suppressed.

[0104] like Figure 8 As shown in FIG, before a compressor winding switching control method is used, a current spike is generated during switching; Figure 9 As shown, after using the winding switching control method of a compressor of the present invention, the current peak is effectively suppressed, and the effect is significant.

[0105] The technical solution of this embodiment is adopted. For a compressor with a winding switching function, the compressor has at least two windings (that is, the stator winding of the motor in the compressor is at least two windings, such as a first winding and a second winding), and a switching device for switching between any two windings of the at least two windings so that the at least two windings switch to work; after the winding switching condition of the compressor is met, the operating frequency of the compressor is controlled to reach a set frequency range, a switching instruction is issued and timing is started to obtain a timing time; the switching device switches the current winding of the at least two windings (that is, the winding participating in the current work) to the target winding (that is, the winding that the target needs to participate) according to the control instruction; in the process of switching from the current winding to the target winding, the output voltage of the inverter at the driving end of the compressor is controlled. The voltage weakening control obtains a first weakened voltage. When the timing time does not reach the set delay time, the voltage weakening control of the output voltage of the inverter at the driving end of the compressor continues to be performed to obtain a second weakened voltage, or the output voltage of the inverter is maintained at the first weakened voltage, and this cycle is repeated until the timing time reaches the set delay time; when the timing time reaches the set delay time, the control parameters of the motor are switched from the control parameters of the current winding to the control parameters of the target winding; thereby, by adjusting the operating frequency of the compressor and the output voltage of the inverter when the compressor needs to switch the winding, the winding switching can be achieved without stopping the compressor, avoiding the restart failure caused by restarting after the compressor stops and switches the winding, thereby improving the operating reliability of the compressor and the user experience.

[0106] According to an embodiment of the present invention, a compressor control device corresponding to the compressor control method is also provided. Figure 6 The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The compressor has a winding unit and a switching device (that is, the winding end of the compressor has a winding unit and a switching device), the winding unit has at least two windings, and the switching device is used to switch the winding participating in the work in the winding unit from the current winding to the target winding, the current winding is the winding currently participating in the work in the winding unit, and the target winding is the winding that needs to participate in the work in the future in the winding unit; in the case where at least two windings include a first winding and a second winding, the current winding is such as the first winding, and the target winding is such as the second winding. In the solution of the present invention, as Figure 6 As shown, the control device of the compressor includes: an acquisition unit 102 and a control unit 104.

[0107] The acquisition unit 102 is configured to acquire system parameters of the system in which the compressor resides, acquire the operating frequency of the compressor, and acquire the output voltage of the inverter at the drive end of the compressor. If the compressor system is an air conditioner control system, the system parameters of the compressor system include the indoor and outdoor temperature difference of the air conditioner environment. The specific functions and processing of the acquisition unit 102 are described in step S110.

[0108] The control unit 104 is configured to determine whether a winding switching condition for the compressor has been met based on system parameters of the system in which the compressor is located. The winding switching condition for the compressor refers to a condition for switching a current winding in the winding unit to a target winding. The specific functions and processing of the control unit 104 are described in step S120.

[0109] The control unit 104 is further configured to, upon determining that a winding switching condition for the compressor has been met, adjust the operating frequency of the compressor and the output voltage of the inverter, and control the switching device to switch the active winding in the winding unit from the current winding to the target winding. This allows the active winding in the winding unit to be switched from the current winding to the target winding without shutting down the compressor. The specific functions and processing of the control unit 104 are further described in step S130.

[0110] The present invention proposes a winding switching control scheme for a switching winding compressor (i.e., a compressor with a switching winding motor), which can perform winding switching without stopping the compressor, avoiding the waiting process of shutdown and restart and the possibility of startup failure, and solving the problem that the compressor may fail to start again due to the load on the system after being shut down; and when the compressor is used in an air conditioner, it will not cause temperature fluctuations, solving the problem of temperature fluctuations caused by shutdown switching.

[0111] In some embodiments, the control unit 104 determines whether a winding switching condition of the compressor has been met based on system parameters of the system in which the compressor is located, including:

[0112] The control unit 104 is further configured to determine whether a system parameter of the system in which the compressor is located has reached a set parameter threshold. The specific functions and processing of the control unit 104 are also shown in step S210.

[0113] The control unit 104 is further configured to determine that the winding switching condition of the compressor has been met if it is determined that the system parameter of the system in which the compressor is located has reached a set parameter threshold. The specific functions and processing of the control unit 104 are also shown in step S220.

[0114] The control unit 104 is further configured to determine that the winding switching condition of the compressor is not met if it is determined that the system parameter of the system where the compressor is located does not reach the set parameter threshold. The specific functions and processing of the control unit 104 are also shown in step S230.

[0115] Figure 7 FIG. 1 is a flow chart of an embodiment of a method for controlling winding switching of a compressor according to the present invention. Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps include:

[0116] Step 1: Determine whether the system has reached the switching condition. Only when the system reaches the switching condition will the winding switching control of the compressor be executed.

[0117] Among them, the switching conditions vary according to the different usage scenarios of the compressor. For example: when the compressor is used in an air conditioner, the difference between the set temperature of the indoor environment of the air conditioner and the actual temperature detected can be used as the switching condition. Specifically, when the air conditioner is just turned on, the difference between the set temperature of the indoor environment and the actual temperature detected is large, and the compressor needs to run at a higher frequency. A winding that can make the compressor run at a higher frequency, such as the first winding, can be used to operate; after the air conditioner has been turned on for a period of time, the difference between the set temperature of the indoor environment and the actual temperature detected is small, and the compressor can meet the usage requirements by running at a lower frequency. A winding that can make the compressor run at a lower frequency, such as the first winding, can be used to operate.

[0118] In the solution of the present invention, whether the winding switching condition of the compressor has been met is determined according to the system parameters of the system where the compressor is located. This solution can be applied to different scenarios of the system where the compressor is located. The winding switching timing of the compressor is determined according to the system parameters of the system where the compressor is located in different scenarios of the system where the compressor is located. This solution has a wide range of applications and can achieve accurate judgment for different scenarios. Furthermore, when it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding, thereby achieving the switching of the winding involved in the work in the winding unit from the current winding to the target winding without stopping the compressor, which is beneficial to improving the reliability and stability of the compressor operation, thereby enabling the compressor to operate without stopping to enhance the user experience.

[0119] In some embodiments, the control unit 104, upon determining that a winding switching condition of the compressor has been met, adjusts the operating frequency of the compressor and the output voltage of the inverter, and controls the switching device to switch the working winding in the winding unit from the current winding to the target winding, including:

[0120] The control unit 104 is further configured to, upon determining that the compressor winding switching condition has been met, adjust the operating frequency of the compressor; thereafter, issue a winding switching instruction and start timing to obtain a timing time; wherein the winding switching instruction is an instruction for controlling the switching device to switch the active winding in the winding unit from the current winding to the target winding. The specific functions and processing of the control unit 104 are further described in step S310.

[0121] The control unit 104 is further configured to control the switching device to operate according to the winding switching instruction to switch the active winding in the winding unit from the current winding to the target winding; and to adjust the output voltage of the inverter during the process of switching the active winding in the winding unit from the current winding to the target winding. The specific functions and processing of the control unit 104 are further described in step S320.

[0122] The control unit 104 is further configured to subsequently switch the control parameters for controlling the compressor from the parameters for controlling the current winding to the parameters for controlling the target winding, thereby completing the winding switching control for switching the active winding in the winding unit from the current winding to the target winding. The specific functions and processing of the control unit 104 are further described in step S330.

[0123] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0124] In step 1, when the switching condition is met, the operating frequency of the compressor is first controlled to reach the set frequency range, and then step 2 is executed.

[0125] Step 2: When the rotational speed reaches the set range, that is, when the operating frequency of the compressor reaches the set frequency range, the controller sends a switching instruction to the switching device, and then executes step 3.

[0126] Step 3. The switching device switches the current winding (i.e., the winding participating in the current operation) of at least two windings to the target winding (i.e., the winding that the target needs to participate) according to the control instruction; and, in the process of switching from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is controlled to be weakened, and then the controller-related parameters are updated to the parameters corresponding to the motor state after the switch.

[0127] In the solution of the present invention, after the system where the compressor is located (such as the control system of the air conditioner) reaches the switching conditions, the controller for controlling the compressor (such as the controller of the system where the compressor is located) first controls the operating frequency of the compressor to reach a set frequency range, and then sends a winding switching instruction to the switching device of the compressor winding, so as to ensure that the compressor operates smoothly and safely after the operating frequency of the compressor reaches the set frequency range, and then sends a winding switching instruction, thereby ensuring the smoothness and reliability of the winding switching of the compressor.

[0128] In some embodiments, the control unit 104 adjusts the operating frequency of the compressor, including:

[0129] The control unit 104 is further configured to determine whether the operating frequency of the compressor is within a set frequency range. The specific functions and processing of the control unit 104 are also shown in step S410.

[0130] The control unit 104 is further configured to determine that the adjustment of the operating frequency of the compressor has been completed if it is determined that the operating frequency of the compressor is within a set frequency range. The specific functions and processing of the control unit 104 are also shown in step S420.

[0131] The control unit 104 is further configured to, if it is determined that the operating frequency of the compressor is not within the set frequency range, determine whether the operating frequency of the compressor is greater than an upper limit of the set frequency range, and determine whether the operating frequency of the compressor is less than a lower limit of the set frequency range. The specific functions and processing of the control unit 104 are further described in step S430.

[0132] The control unit 104 is further configured to control the operating frequency of the compressor to decrease to within the set frequency range if it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range. The specific functions and processing of the control unit 104 are also shown in step S440.

[0133] The control unit 104 is further configured to control the operating frequency of the compressor to increase to within the set frequency range if it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range. The specific functions and processing of the control unit 104 are also shown in step S450.

[0134] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0135] In step 1, when the switching condition is met, the operating frequency of the compressor is first controlled to reach a set frequency range, and then step 2 is executed to issue a switching instruction.

[0136] The operating frequency of the compressor cannot be too low, otherwise it will easily shut down. For example, the operating frequency of the compressor can be controlled to be between 40Hz and 80Hz.

[0137] In the solution of the present invention, after the switching conditions are met, the controller first controls the operating frequency of the compressor to reach the set frequency range. The set frequency range means that the frequency cannot be too low during switching. By controlling the operating frequency of the compressor to reach the set frequency range, the winding switching is ensured while the compressor is running smoothly.

[0138] In some embodiments, the control device of the compressor described in the solution of the present invention further includes: the control unit 104 is also configured to start timing to obtain the timing time when the winding switching instruction is issued; preferably, the timing is started to obtain the timing time at the same time as the winding switching instruction is issued.

[0139] The control unit 104 adjusts the output voltage of the inverter during the process of switching the working winding in the winding unit from the current winding to the target winding, including:

[0140] The control unit 104 is further configured to control the output voltage of the inverter to be weakened during the process of switching the working winding in the winding unit from the current winding to the target winding. The specific functions and processing of the control unit 104 are also shown in step S510.

[0141] The control unit 104 is further configured to determine whether the timing time reaches the set delay time. The specific functions and processing of the control unit 104 are also shown in step S520.

[0142] The control unit 104 is further configured to determine that the output voltage of the inverter has been adjusted if the timer reaches the set delay time, i.e., stop adjusting the output voltage of the inverter. The specific functions and processing of the control unit 104 are further described in step S530.

[0143] The control unit 104 is further configured to, if it determines that the timed time has not reached the set delay time, wait until the timed time reaches the set delay time; or return to continue reducing the output voltage of the inverter until the timed time reaches the set delay time. The specific functions and processing of the control unit 104 are further described in step S540.

[0144] That is, the control method for the compressor according to the solution of the present invention further includes: when a winding switching instruction is issued, starting a timer to obtain a timer time; preferably, starting a timer to obtain a timer time at the same time as the winding switching instruction is issued; and adjusting the output voltage of the inverter, specifically, adjusting the output voltage of the inverter in combination with the timer time. That is, in the process of switching the working winding in the winding unit from the current winding to the target winding, adjusting the output voltage of the inverter; then, determining whether the timer time has reached a set delay time; if it is determined that the timer time has reached the set delay time, determining that the adjustment of the output voltage of the inverter has been completed, that is, stopping the adjustment of the output voltage of the inverter; if it is determined that the timer time has not reached the set delay time, waiting until the timer time has reached the set delay time; or returning to continue adjusting the output voltage of the inverter until the timer time has reached the set delay time.

[0145] like Figure 7 As shown, the present invention proposes a method for controlling winding switching of a compressor, and the specific operation steps also include:

[0146] In step 2, when the speed reaches the set range, that is, when the operating frequency of the compressor reaches the set frequency range, the controller sends a switching instruction to the switching device and simultaneously starts timing to obtain the timing time to start the delay, and then executes step 3. Among them, the control method for the operating frequency of the compressor to reach the set frequency range needs to adopt a corresponding control method according to the high or low operating frequency of the compressor. For example: when the operating frequency of the compressor is high, the operating frequency of the compressor needs to be reduced so that the operating frequency of the compressor reaches the set frequency range; when the operating frequency of the compressor is low, the operating frequency of the compressor needs to be increased so that the operating frequency of the compressor reaches the set frequency range.

[0147] In step 3, the switching device switches the current winding (i.e., the winding participating in the current operation) of at least two windings to the target winding (i.e., the winding that the target needs to participate) according to the control instruction; and, in the process of switching from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is controlled to be weakened, and then step 4 is executed.

[0148] In step 3, after the controller issues a switching command, the inverter output voltage in the compressor drive system is subjected to voltage reduction control and maintained for a predetermined period of time. This voltage reduction control is terminated after the compressor winding switching device completes switching. The voltage reduction control duration is the time from the issuance of the switching command to the completion of the winding switching by the switching device. This duration is related to the response time and operation time of the switching device.

[0149] The compressor winding switching device can be constructed using relays, insulated-gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), or other devices. The compressor winding switching device can employ related switching devices in the art. Different switching devices have different response and actuation times. Generally speaking, relays have millisecond response times, while IGBTs or MOSFETs have microsecond response times. These response and actuation times can be measured in advance.

[0150] Step 4: Determine whether the timed delay has reached the set delay time, i.e., whether the delay has expired. If so, proceed to Step 5; otherwise, continue to wait in Step 4 until the delay expires; or return to Step 3 to continue reducing the output voltage of the inverter at the compressor's drive end during the switching process from the current winding to the target winding until the delay expires. In the solution of the present invention, the inverter output voltage is reduced before the delay expires, and then Step 5 is executed.

[0151] Step 5: Update the controller-related parameters to the parameters corresponding to the motor state after the switch, and then return to step 2 to continue to determine whether the delay has ended. In other words, before the switching device completes the switch, execute step 4 (which can be repeated) and step 5.

[0152] In the solution of the present invention, when a winding switching instruction is issued, timing is started to obtain the timing time; in the process of switching the working winding in the winding unit from the current winding to the target winding, if the timing time does not reach the preset delay time, the output voltage of the inverter is adjusted to stabilize the output voltage of the inverter within a safe range before the winding switching is completed, thereby ensuring the non-stop operation of the compressor on the one hand and the safety of the winding switching on the other hand.

[0153] In some embodiments, the control unit 104 performs weakening control on the output voltage of the inverter, including: the control unit 104 is specifically further configured to adjust the value of the output voltage of the inverter to the product value of the output voltage of the inverter and a set weakening coefficient; the set weakening coefficient is greater than 0 and less than 1.

[0154] As Figure 7 shown, a winding switching control method for a compressor proposed by the solution of the present invention further includes the following specific operation steps:

[0155] In step 3, assume that the controller calculates the output voltage of the inverter as voltage Vcalc according to a pre-set control algorithm, and a weakening coefficient k is pre-set. When the controller issues a switching instruction, the actual voltage Vout output by the inverter = k * Vcalc, where 0 < k < 1. Among them, the weakening coefficient k needs to be selected according to the actual situation. If the weakening coefficient k is too small, the suppression effect on the current spike is strong, but it may be prone to shutdown; if the weakening coefficient k is too large, current spikes may occur.

[0156] In the solution of the present invention, when a winding switching instruction is issued, timing is started to obtain a timing time; during the process of switching the winding participating in the work in the winding unit from the current winding to the target winding, when the timing time does not reach the preset delay time, the output voltage of the inverter is weakened and controlled to adjust the output voltage of the inverter, so that the output voltage of the inverter is stabilized within a safe range before the winding switching is completed, ensuring the safety of winding switching under the condition of continuous operation of the compressor.

[0157] In some embodiments, when the control unit 104 controls the control parameters of the compressor to switch from the parameters for controlling the current winding to the parameters for controlling the target winding, the control parameters of the compressor include at least one of the motor parameters of the motor in the compressor, the control loop parameters of the motor in the compressor, and the output voltage of the inverter in the drive end of the compressor.

[0158] Among them, the motor parameters of the motor include at least one of the resistance of the motor, the d-axis and q-axis inductances of the motor, and the back electromotive force coefficient of the motor. The control loop parameters of the motor include at least one of the parameters of the PI module of the speed loop of the motor, the parameters of the PI module of the current loop of the motor, and the parameters of the observer of the motor.

[0159] As Figure 7 shown, a winding switching control method for a compressor proposed by the solution of the present invention further includes the following specific operation steps:

[0160] In the solution of the present invention, in step 5, after the inverter output voltage is subjected to voltage reduction control, or during the period of voltage reduction control, the relevant controller parameters are also updated to the parameters corresponding to the switched motor state. This ensures that the relevant controller parameters are consistent with the control parameters of the switched windings, thereby ensuring the reliability and safety of the switched winding control. The relevant controller parameters refer to the motor parameters that change due to the change in the motor winding connection state, and the corresponding relevant control parameters are switched to the control parameters corresponding to the new motor.

[0161] Among them, the relevant parameters of the controller generally involve motor parameters and loop control parameters; the motor parameters include resistance, d-axis and q-axis inductance and back-electromotive force coefficient; the loop parameters include the PI (proportional-integral) parameters of the speed loop and current loop and the parameters of the observer.

[0162] Figure 8 FIG. 1 is a schematic diagram of a winding switching current waveform before using a winding switching control method for a compressor of the present invention. Figure 9 FIG1 is a schematic diagram of a winding switching current waveform after using a winding switching control method of a compressor according to the present invention. Figure 8 and Figure 9 The three curves shown are schematic diagrams of the three-phase current waveforms of the compressor. The present invention proposes a winding switching control scheme for a switching winding compressor, which can perform winding switching without stopping the compressor. The switching is smooth and reliable, without current spikes, and is suitable for switching between various types of winding connection forms, that is, suitable for switching motor windings of various connection forms. For example: The present invention proposes a winding switching control scheme for a switching winding compressor, which can be applied to star-delta switching, series-parallel switching and various other combination switching, such as switching between multiple sets of windings, similar to switching from the first winding to the second winding, such as Figure 8 and Figure 9 Shown is the compressor switching current waveform with star-delta switching.

[0163] The present invention proposes a winding switching control scheme for a switching winding compressor, which can realize winding switching without stopping the compressor. There is no current spike during the switching process and no abnormal protection of the controller will be caused. Figure 8 and Figure 9 They are the current waveforms switched at a frequency of 50Hz, Figure 8 There is a significant current spike, which can reach 10.25A; Figure 9 After using the winding switching control method for a compressor of the present invention, the switching is smooth, there is no current spike, and the current spike is effectively suppressed.

[0164] like Figure 8 As shown in FIG, before a compressor winding switching control method is used, a current spike is generated during switching; Figure 9 As shown, after using the winding switching control method of a compressor of the present invention, the current peak is effectively suppressed, and the effect is significant.

[0165] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0166] According to an embodiment of the present invention, a compressor corresponding to the compressor control device is also provided. The compressor may include: the compressor control device described above.

[0167] Since the processing and functions implemented by the compressor of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned device, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0168] According to an embodiment of the present invention, an air conditioner is further provided that corresponds to a control device for a compressor, and the air conditioner may include: the control device for the compressor described above, or the compressor described above.

[0169] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0170] According to an embodiment of the present invention, a computer program product corresponding to the compressor control method is further provided, comprising a computer program. When the computer program is executed by a processor, the steps of the compressor control method described above are implemented.

[0171] Since the processing and functions implemented by the product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0172] According to an embodiment of the present invention, a storage medium corresponding to a compressor control method is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the compressor control method described above.

[0173] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0174] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0175] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A method for controlling a compressor, characterized in that: The compressor comprises a winding unit and a switching device, wherein the winding unit comprises at least two windings, and the switching device is used to switch the winding involved in the work in the winding unit from the current winding to the target winding; The compressor control method includes: Obtaining system parameters of the system in which the compressor is located, obtaining the operating frequency of the compressor, and obtaining the output voltage of the inverter in the driving end of the compressor; determining, based on system parameters of a system in which the compressor is located, whether a winding switching condition of the compressor has been met; If it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor and the output voltage of the inverter are adjusted, and the switching device is controlled to operate so as to switch the winding involved in the work in the winding unit from the current winding to the target winding.

2. The compressor control method according to claim 1, characterized in that: Determining whether a winding switching condition of the compressor has been met according to system parameters of a system in which the compressor is located includes: Determining whether a system parameter of the system in which the compressor is located has reached a set parameter threshold; If it is determined that the system parameter of the system where the compressor is located has reached a set parameter threshold, it is determined that the winding switching condition of the compressor has been met; If it is determined that the system parameter of the system where the compressor is located does not reach the set parameter threshold, it is determined that the winding switching condition of the compressor is not met.

3. The compressor control method according to claim 1 or 2, characterized in that: Adjusting the operating frequency of the compressor and the output voltage of the inverter, and controlling the switching device to switch the working winding in the winding unit from the current winding to the target winding, including: Adjusting the operating frequency of the compressor; then issuing a winding switching instruction; controlling the switching device to operate according to the winding switching instruction; and adjusting the output voltage of the inverter; The control parameters for controlling the compressor are switched from the parameters for controlling the current winding to the parameters for controlling the target winding. At this point, the winding switching control of switching the working winding in the winding unit from the current winding to the target winding is completed.

4. The method for controlling a compressor according to claim 3, wherein: Adjusting the operating frequency of the compressor includes: determining whether the operating frequency of the compressor is within a set frequency range; If it is determined that the operating frequency of the compressor is within the set frequency range, it is determined that the adjustment of the operating frequency of the compressor has been completed; If it is determined that the operating frequency of the compressor is not within the set frequency range, determining whether the operating frequency of the compressor is greater than an upper limit of the set frequency range, and determining whether the operating frequency of the compressor is less than a lower limit of the set frequency range; If it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, controlling the operating frequency of the compressor to be reduced to within the set frequency range; If it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range, the operating frequency of the compressor is controlled to increase to within the set frequency range.

5. The method for controlling a compressor according to claim 3, wherein: Also includes: When a winding switching instruction is issued, timing is started to obtain the timing time; Adjusting the output voltage of the inverter includes: performing a weakening control on the output voltage of the inverter; Determine whether the timing time reaches the set delay time; If it is determined that the timing time reaches the set delay time, it is determined that the adjustment of the output voltage of the inverter has been completed; If it is determined that the timing time has not reached the set delay time, wait until the timing time reaches the set delay time; or return to continue to weaken the output voltage of the inverter until the timing time reaches the set delay time.

6. The method for controlling a compressor according to claim 5, wherein: The output voltage of the inverter is weakened and controlled, comprising: The output voltage of the inverter is adjusted to a value obtained by multiplying the output voltage of the inverter by a set weakening coefficient; the set weakening coefficient is greater than 0 and less than 1.

7. The method for controlling a compressor according to claim 3, wherein: The control parameters of the compressor include: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and at least one of an output voltage of an inverter in a drive end of the compressor; The motor parameters of the motor include at least one of the resistance of the motor, the d-axis and q-axis inductances of the motor, and the back electromotive force coefficient of the motor; The control loop parameters of the motor include at least one of parameters of a PI module of a speed loop of the motor, parameters of a PI module of a current loop of the motor, and parameters of an observer of the motor.

8. A control device for a compressor, characterized in that: The compressor comprises a winding unit and a switching device, wherein the winding unit comprises at least two windings, and the switching device is used to switch the winding involved in the work in the winding unit from the current winding to the target winding; The control device of the compressor comprises: an acquisition unit configured to acquire system parameters of a system in which the compressor is located, acquire an operating frequency of the compressor, and acquire an output voltage of an inverter in a driving end of the compressor; a control unit configured to determine whether a winding switching condition of the compressor has been met based on system parameters of a system in which the compressor is located; The control unit is further configured to adjust the operating frequency of the compressor and the output voltage of the inverter if it is determined that the winding switching condition of the compressor has been met, and control the operation of the switching device to switch the winding involved in the work in the winding unit from the current winding to the target winding.

9. A compressor, characterized in that: include: The compressor control device according to claim 8.

10. An air conditioner, characterized in that: include: The control device for a compressor according to claim 8, or the compressor according to claim 9.

11. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the compressor control method according to any one of claims 1 to 7.

12. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the compressor control method according to any one of claims 1 to 7 are implemented.

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