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

Abstract

The application discloses a compressor and a control method and device thereof, an air conditioner, a storage medium and a computer program product. The compressor has a winding unit and a switching device, and the winding unit has at least two windings. The method comprises the following steps: acquiring system parameters of a system in which the compressor is located, acquiring an operating frequency of the compressor, and acquiring an output voltage of an inverter in a driving end of the compressor; determining whether a winding switching condition of the compressor has been reached according to the system parameters; if it is determined that the winding switching condition of the compressor has been reached, adjusting the operating frequency of the compressor and the output voltage of the inverter, and controlling the switching device to work, so as to switch the winding participating in work in the winding unit from a current winding to a target winding. According to the scheme, when winding switching of the compressor is needed, the operating frequency of the compressor and the output voltage of the inverter are adjusted, winding switching is realized without stopping the compressor, and the operating reliability of the compressor and the user experience are improved.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a compressor control method, device, compressor, air conditioner, storage medium, and computer program product, and particularly to a compressor winding switching control method, device, compressor, air conditioner, storage medium, and computer program product. Background Technology

[0002] The compressor windings are the windings of the motor within the compressor; some motor windings can be switched, hence the name switchable winding motors. Switchable winding motors have the advantages of high back EMF and high efficiency at low frequencies, and low back EMF and high operating frequency at high frequencies.

[0003] In some solutions, the compressor winding switching control involves stopping the machine before switching the winding state, then restarting it after the switching is complete to operate with the new motor connection. The biggest advantage of this stop-and-switch method is that it ensures the reliability of the switching. However, if the system pressure is unbalanced after the compressor stops to switch the windings and then restarts, the restart may fail.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a compressor control method, device, compressor, air conditioner, storage medium, and computer program product to solve the problem that restarting a compressor after it has stopped to switch windings will fail if the system pressure is unbalanced. This invention achieves the effect of adjusting the compressor's operating frequency and the inverter's output voltage when the compressor needs to switch windings, enabling winding switching without stopping the compressor, thus avoiding restart failure after the compressor stops to switch windings and improving the compressor's operational reliability and user experience.

[0006] This invention provides a compressor control method. The compressor has a winding unit and a switching device. The winding unit has at least two windings. The switching device is used to switch the working winding in the winding unit from the current winding to a target winding. The compressor control method includes: acquiring system parameters of the system in which the compressor is located, acquiring the operating frequency of the compressor, and acquiring the output voltage of the inverter in the drive terminal 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 switching device to work, so as to switch the working winding in the winding unit from the current winding to the target winding.

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

[0008] In some embodiments, 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, includes: adjusting the operating frequency of the compressor; then, issuing a winding switching command; controlling the switching device to operate according to the winding switching command; and adjusting the output voltage of the inverter; and controlling the compressor's control parameters to switch from parameters controlling the current winding to parameters controlling the target winding. This completes the winding switching control that switches the working winding 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 the operating frequency of the compressor is determined to be within the set frequency range, then determining that the adjustment of the operating frequency of the compressor has been completed; if the operating frequency of the compressor is determined not to be within the set frequency range, then 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 the operating frequency of the compressor is determined to be greater than the upper limit of the set frequency range, then controlling the operating frequency of the compressor to decrease to the set frequency range; if the operating frequency of the compressor is determined to be less than the lower limit of the set frequency range, then controlling the operating frequency of the compressor to increase to the set frequency range.

[0010] In some embodiments, the method further includes: starting a timer to obtain a timing duration upon issuing a winding switching command; adjusting the output voltage of the inverter, including: performing a reduction control on the output voltage of the inverter; determining whether the timing duration has reached a set delay time; if it is determined that the timing duration has reached the set delay time, then determining that the adjustment of the output voltage of the inverter has been completed; if it is determined that the timing duration has not reached the set delay time, then waiting until the timing duration reaches the set delay time; or returning to continue performing a reduction control on the output voltage of the inverter until the timing duration reaches the set delay time.

[0011] In some embodiments, the output voltage of the inverter is reduced by controlling the reduction, including adjusting the value of the output voltage of the inverter to be the product of the output voltage of the inverter and a set reduction coefficient; the set reduction coefficient is greater than 0 and less than 1.

[0012] In some embodiments, the control parameters of the compressor include at least one of: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and output voltage of the inverter in the drive terminal of the compressor; wherein, the motor parameters include at least one of: resistance of the motor, d-axis and q-axis inductance of the motor, and back EMF coefficient of the motor; the control loop parameters of the motor include at least one of: 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 parameters of the observer of the motor.

[0013] In conjunction with the above method, another aspect of the present invention provides a compressor control device, 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 working winding in the winding unit from the current winding to the target winding; the compressor control device 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 drive 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, if it is determined that the winding switching condition of 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 operate, so as to switch the working winding in the winding unit from the current winding to the target winding.

[0014] In some implementations, the control unit determines 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, including: determining whether the system parameters of the system in which the compressor is located have reached a set parameter threshold; if it is determined that the system parameters of the system in which the compressor is located have reached the set parameter threshold, then it is determined that the winding switching condition of the compressor has been met; if it is determined that the system parameters of the system in which the compressor is located have not reached the set parameter threshold, then it is determined 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 working winding in the winding unit from the current winding to the target winding. This includes: adjusting the operating frequency of the compressor; then, issuing a winding switching command; controlling the switching device to operate according to the winding switching command; and adjusting the output voltage of the inverter; and controlling the compressor's control parameters to switch from parameters controlling the current winding to parameters controlling the target winding. This completes the winding switching control that switches the working winding in the winding unit from the current winding to the target winding.

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

[0017] In some embodiments, the control unit is further configured to start timing to obtain a timing time upon issuing a winding switching command; the control unit adjusts the output voltage of the inverter, including: performing weakening control on the output voltage of the inverter; determining whether the timing time has reached a set delay time; if it is determined that the timing time has reached 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 has not reached the set delay time, waiting until the timing time reaches the set delay time; or returning to continue weakening control on the output voltage of the inverter until the timing time reaches the set delay time.

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

[0019] In some embodiments, the control parameters of the compressor include at least one of: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and output voltage of the inverter in the drive terminal of the compressor; wherein, the motor parameters include at least one of: resistance of the motor, d-axis and q-axis inductance of the motor, and back EMF coefficient of the motor; the control loop parameters of the motor include at least one of: 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 parameters of the observer of the motor.

[0020] In conjunction with the above-described device, the present invention further provides a compressor, comprising: a control device for the compressor described above.

[0021] In conjunction with the above-described device, the present invention further provides an air conditioner, comprising: a control device for the compressor described above, or the compressor described above.

[0022] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the steps of the compressor control method described above.

[0023] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the compressor control method described above.

[0024] Therefore, the present invention addresses a compressor with a winding switching function. The compressor has at least two windings (i.e., the stator windings of the motor in the compressor are at least two windings, such as a first winding and a second winding), and a switching device for switching between any two of the at least two windings to enable the switching operation of the at least two windings. After the winding switching conditions of the compressor are met, the operating frequency of the compressor is controlled to reach a set frequency range, a switching command is issued, and a timing period is started to obtain the timing time. The switching device switches the current winding (i.e., the winding currently engaged in operation) to the target winding (i.e., the target winding that needs to participate) according to the control command. During the switching process from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is voltage-controlled. The first weakened voltage is obtained by weakening control. If the timing time has not reached the set delay time, the output voltage of the inverter at the compressor drive end is further weakened to obtain the second weakened voltage, or the output voltage of the inverter is maintained at the first weakened voltage. This cycle is repeated until the timing time reaches the set delay time. If 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. Thus, by adjusting the operating frequency of the compressor and the output voltage of the inverter when the compressor needs to switch windings, winding switching can be performed without stopping the compressor. This avoids restarting the compressor after stopping to switch windings, which would lead to restart failure, thereby improving the reliability of compressor operation and user experience.

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

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic flowchart of an embodiment of the compressor control method of the present invention;

[0028] Figure 2 This is a flowchart illustrating an embodiment of the method of the present invention for determining whether the winding switching conditions of the compressor have been met;

[0029] Figure 3 This is a schematic flowchart of an embodiment of the method of the present invention, which adjusts the operating frequency of the compressor and the output voltage of the inverter, and controls the operation of the switching device.

[0030] Figure 4 This is a schematic flowchart of an embodiment of the method of the present invention for adjusting the operating frequency of the compressor;

[0031] Figure 5 This is a schematic flowchart of an embodiment of the method of the present invention for adjusting the output voltage of the inverter;

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

[0033] Figure 7 This is a schematic flowchart of an embodiment of a compressor winding switching control method according to the present invention;

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

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

[0036] Referring to 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 Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] Considering that if the system pressure is unbalanced after the compressor stops to switch windings and then restarts, the restart may fail. For example, in actual use, the compressor must wait for the system pressure to equalize after stopping before restarting; otherwise, it may fail to start. In addition, when the compressor is used in an air conditioner, this shutdown and waiting process can cause fluctuations in indoor temperature, seriously affecting the user experience.

[0040] Specifically, switching-winding compressors (i.e., compressors with switching-winding motors) are unstable at the moment of winding switching. Combined with load changes and differences in motor parameters before and after switching, this can easily lead to overcurrent shutdown, and in severe cases, even motor demagnetization. Therefore, a safer and more reliable method for winding switching is to stop the compressor first, then switch. However, after the compressor completes the switching, it must wait for the system pressure to equalize before restarting; otherwise, it may fail to start. This shutdown and waiting process causes fluctuations in indoor temperature, severely impacting the user experience.

[0041] Therefore, 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 stopping and restarting and the possibility of starting 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 compressor control method is provided, such as... Figure 1 The diagram shows a flowchart of an embodiment of the method of the present invention. The compressor has a winding unit and a switching device (i.e., the winding end of the compressor has a winding unit and a switching device). The winding unit has at least two windings. The switching device is used to switch the winding currently engaged in operation within the winding unit from a current winding to a target winding. The current winding is the winding currently engaged in operation within the winding unit, and the target winding is the winding in the winding unit that will be engaged in operation in the future. When the at least two windings include a first winding and a second winding, the current winding is like the first winding, and the target winding is like 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] In step S110, the system parameters of the system containing the compressor are obtained, including the operating frequency of the compressor and the output voltage of the inverter in the compressor's drive unit. Wherein, if the system containing the compressor is an air conditioning control system, the system parameters include the indoor and outdoor temperature difference of the air conditioning environment. The compressor's drive unit is the drive system of the motor within the compressor, such as a frequency converter or motor controller.

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

[0045] In 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 work, so as to switch the working winding in the winding unit from the current winding to the target winding, thereby realizing the switching of the working winding 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 stopping and restarting and the possibility of starting failure. It solves the problem that restarting the compressor after stopping may cause starting failure due to system load. Furthermore, when the compressor is used in an air conditioner, it will not cause temperature fluctuations, thus solving the problem of temperature fluctuations caused by stopping and switching.

[0047] In some implementations, the specific process of determining whether the winding switching conditions of the compressor have been met based on the system parameters of the system in which the compressor is located in step S120 is illustrated in the following exemplary description.

[0048] The following is combined Figure 2 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for determining whether the winding switching condition of the compressor has been met. The specific process of determining whether the winding switching condition of the compressor has been met in step S120 is further explained, including steps S210 to S230.

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

[0050] Step S220: If it is determined that the system parameters of the system where the compressor is located have reached the set parameter threshold, then it is determined that the winding switching condition of the compressor has been met.

[0051] Step S230: If it is determined that the system parameters of the system where the compressor is located have not reached the set parameter threshold, then it is determined that the winding switching condition of the compressor has not been met.

[0052] Figure 7 This is a schematic flowchart illustrating an embodiment of a compressor winding switching control method according to the present invention. Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which include:

[0053] Step 1: Determine whether the system has met the switching conditions. Only after the system has met the switching conditions will the compressor winding switching control be executed.

[0054] The switching conditions vary depending on the compressor's usage scenario. For example, when the compressor is used in an air conditioner, the difference between the set indoor temperature and the detected actual temperature can be used as the switching condition. Specifically, when the air conditioner is first turned on, the difference between the set indoor temperature and the detected actual temperature is large, requiring the compressor to operate at a higher frequency. In this case, a winding that allows the compressor to operate at a higher frequency, such as the first winding, can be used. After the air conditioner has been running for a while, the difference between the set indoor temperature and the detected actual temperature is small, and the compressor can operate at a lower frequency to meet the usage requirements. In this case, a winding that allows the compressor to operate at a lower frequency, such as the first winding, can be used.

[0055] In the solution of this invention, the winding switching condition of the compressor is determined based on the system parameters of the system in which the compressor is located. This method is applicable to different scenarios of the system in which the compressor is located. The timing of the winding switching of the compressor is determined based on the system parameters of the system in which the compressor is located under different scenarios. This method 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 work, so as to switch the working winding in the winding unit from the current winding to the target winding. Thus, the working winding in the winding unit can be switched from the current winding to the target winding without stopping the compressor. This is beneficial to improving the reliability and stability of the compressor operation, thereby enabling the compressor to work without stopping and improving the user experience.

[0056] In some embodiments, the specific process of adjusting the operating frequency of the compressor and the output voltage of the inverter, and controlling the switching device to operate, in step S130 after determining that the winding switching conditions of the compressor have been met, to switch the working winding in the winding unit from the current winding to the target winding, is described in the following exemplary description.

[0057] The following is combined Figure 3 The schematic diagram shows an embodiment of the method of the present invention, which adjusts the operating frequency of the compressor and the output voltage of the inverter and controls the operation of the switching device. It 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: After determining that the winding switching conditions of the compressor have been met, adjust the operating frequency of the compressor; then, issue a winding switching command and start timing to obtain the timing time; wherein, the winding switching command is used to control the operation of the switching device so that the switching device switches the working winding in the winding unit from the current winding to the target winding.

[0059] Step S320: Control the switching device to operate according to the winding switching command, so as to switch the working winding in the winding unit from the current winding to the target winding; and, during the process of switching the working winding in the winding unit from the current winding to the target winding, adjust the output voltage of the inverter.

[0060] Step S330: After that, the control parameters controlling the compressor are switched from the parameters controlling the current winding to the parameters controlling the target winding. Thus, the winding switching control of switching the working winding 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 compressor winding switching control method, the specific operation steps of which further include:

[0062] In step 1, once the switching conditions are met, the compressor's operating frequency is first controlled to reach the set frequency range, and then step 2 is executed.

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

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

[0065] In the present invention, after the compressor system (such as the control system of an air conditioner) reaches the switching conditions, the controller for controlling the compressor (such as the controller of the compressor system) first controls the compressor's operating frequency to reach the set frequency range, and then sends a winding cutting command to the compressor winding switching device. After the compressor's operating frequency reaches the set frequency range, and the compressor is running smoothly and safely, the winding switching command is then issued, thereby ensuring the smoothness and reliability of the compressor winding switching.

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

[0067] The following is combined Figure 4 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for adjusting the operating frequency of the compressor. It 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 the set frequency range.

[0069] Step S420: If it is determined that the operating frequency of the compressor is within the set frequency range, then it is determined that the adjustment of the operating frequency of the compressor has been completed.

[0070] Step S430: If it is determined that the operating frequency of the compressor is not within the set frequency range, then determine whether the operating frequency of the compressor is greater than the upper limit of the set frequency range, and determine whether the operating frequency of the compressor is less than the lower limit of the set frequency range.

[0071] Step S440: If it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, then the operating frequency of the compressor is controlled to be reduced to the set frequency range.

[0072] Step S450: If it is determined that the operating frequency of the compressor is less than the lower limit of the set frequency range, then the operating frequency of the compressor is controlled to increase to the set frequency range.

[0073] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0074] In step 1, once the switching conditions are met, the compressor's operating frequency is first controlled to reach the set frequency range, and then step 2 is executed to issue a switching command.

[0075] The compressor's operating frequency cannot be too low, otherwise it will easily shut down. For example, the compressor's operating frequency can be controlled 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 of the present invention further includes: starting a timer to obtain a timing time when a winding switching command is issued; preferably, the timer is started at the same time as the winding switching command is issued to obtain the timing time.

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

[0079] The following is combined with Figure 5 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for adjusting the output voltage of the inverter. It further illustrates the specific process of adjusting the output voltage of the inverter in step S320, including steps S510 to S540.

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

[0081] Step S520: Then, determine whether the timing time has reached the set delay time.

[0082] Step S530: If it is determined that the timing time has reached the set delay time, then it is determined that the adjustment of the inverter's output voltage has been completed, that is, the adjustment of the inverter's output voltage is stopped.

[0083] Step S540: If it is determined that the timing time has not reached the set delay time, then 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] In other words, the compressor control method described in this invention further includes: starting a timer to obtain a timing duration when a winding switching command is issued; preferably, starting the timer simultaneously with issuing the winding switching command; adjusting the output voltage of the inverter, specifically: adjusting the output voltage of the inverter in conjunction with the timing duration. That is, adjusting 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; then, determining whether the timing duration has reached a set delay time; if it is determined that the timing duration has reached the set delay time, then it is determined that the adjustment of the inverter's output voltage has been completed, i.e., the adjustment of the inverter's output voltage is stopped; if it is determined that the timing duration has not reached the set delay time, then waiting until the timing duration reaches the set delay time; or returning to continue adjusting the inverter's output voltage until the timing duration reaches the set delay time.

[0085] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0086] In step 2, once the rotational speed reaches the set range, i.e., when the compressor's operating frequency reaches the set frequency range, the controller sends a switching command to the switching device and simultaneously starts timing to obtain the timing time so that the delay begins, after which step 3 is executed. The control method for the compressor's operating frequency to reach the set frequency range needs to be tailored according to the compressor's operating frequency. For example, when the compressor's operating frequency is high, it needs to be reduced to reach the set frequency range; when the compressor's operating frequency is low, it needs to be increased to reach the set frequency range.

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

[0088] In step 3, after the controller issues a switching command, voltage reduction control is applied to the output voltage of the inverter in the compressor drive system and maintained for a certain period of time until the switching device of the compressor windings completes the switching. The voltage reduction control duration is the time from issuing the switching command to the completion of the winding switching by the switching device. The duration of the voltage reduction control is related to the response time and action time of the switching device.

[0089] The compressor winding switching device can be constructed using relays, or it can be constructed using devices such as insulated-gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs). The compressor winding switching device can employ relevant switching devices in this field. Different switching devices have different response times and operating times. Generally, relays are in the millisecond range, while IGBTs or MOSFETs are in the microsecond range. The response and operating times can be measured in advance.

[0090] Step 4: Determine if the timing has reached the set delay time, i.e., determine if the delay has ended. If yes, proceed to Step 5; otherwise, continue waiting in Step 4 until the delay ends. Alternatively, return to Step 3 and continue voltage reduction control on the inverter output voltage at the compressor drive end during the switching from the current winding to the target winding until the delay ends. In the solution of this invention, the inverter output voltage is reduced before the delay ends, and then Step 5 is executed.

[0091] Step 5: Update the controller parameters to match the parameters corresponding to the switched motor state, then return to step 2 to check if the delay has ended. In other words, before the switching device completes the switching, execute steps 4 (which can be repeated) and 5.

[0092] In the present invention, a timing period is started when a winding switching command is issued to obtain the timing time; during the process of switching the working winding in the winding unit from the current winding to the target winding, if the timing time has not reached the preset delay time, the output voltage of the inverter is adjusted so that the output voltage of the inverter is stabilized within a safe range before the winding switching is completed. This ensures both the uninterrupted operation of the compressor and the safety of the winding switching.

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

[0094] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0095] In step 3, it is assumed that the controller calculates the output voltage of the inverter as voltage Vcalc according to a preset control algorithm, and a derating coefficient k is preset. After the controller issues a switching command, the actual output voltage Vout of the inverter controlled is Vout=k*Vcalc, where 0<k<1. The derating coefficient k needs to be selected according to actual conditions. If the derating coefficient k is too small, the suppression effect on current spikes is strong, but it may easily cause shutdown; if the derating coefficient k is too large, current spikes may occur.

[0096] In the solution of the present invention, when a winding switching command is issued, timing is started to obtain a timing time; in the process of switching the working winding 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 adjusted by performing derating control on 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, and the safety of winding switching is ensured while the compressor operates without shutdown.

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

[0098] Wherein, the motor parameters of the motor include at least one of the resistance of the motor, 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.

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

[0100] In the solution of the present invention, in step 5, after the voltage derating control is performed on the output voltage of the inverter, or during the period when the voltage derating control is performed on the output voltage of the inverter, relevant parameters of the controller are also updated to parameters corresponding to the motor state after switching, so that the relevant parameters of the controller are consistent with the control parameters of the winding after switching, and the reliability and safety of winding control after switching are ensured. The relevant parameters of the controller refer to that, since the winding connection state of the motor changes, which causes the motor parameters to change, the corresponding relevant control parameters need to be switched to the control parameters corresponding to the new motor.

[0101] 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 EMF coefficient; the loop parameters include the PI (proportional-integral) parameters of the speed loop and current loop, as well as the observer parameters.

[0102] Figure 8 This is a schematic diagram of the winding switching current waveform before using the winding switching control method for a compressor according to the present invention. Figure 9 This is a schematic diagram of the winding switching current waveform after using the 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, i.e., suitable for switching motor windings of various connection forms. For example, the winding switching control scheme for a switching winding compressor proposed in this invention can be applied to star-delta switching, series-parallel switching, and various other combined switching, such as switching between multiple sets of windings, similar to switching from the first winding to the second winding, etc. Figure 8 and Figure 9 The figure shows the switching current waveform of a compressor with star-delta switching.

[0103] The present invention proposes a winding switching control scheme for a switching compressor, which can achieve winding switching without stopping the compressor. The switching process is free of current spikes and will not cause abnormal protection of the controller. Figure 8 and Figure 9 These are the current waveforms switching at a frequency of 50Hz. Figure 8 There are obvious current spikes, which can reach 10.25A; Figure 9 After using the compressor winding switching control method of the present invention, the switching is smooth, there are no current spikes, and the current spikes are effectively suppressed.

[0104] like Figure 8 As shown, before using a compressor winding switching control method, current spikes are generated during switching; such as Figure 9 As shown, after using the winding switching control method of the compressor of the present invention, the current spikes are effectively suppressed, and the effect is significant.

[0105] The technical solution of this embodiment addresses a compressor with winding switching function. The compressor has at least two windings (i.e., the stator windings of the motor in the compressor are at least two windings, such as a first winding and a second winding), and a switching device for switching between any two of the at least two windings to enable the at least two windings to switch operation. After the winding switching conditions of the compressor are met, the operating frequency of the compressor is controlled to reach a set frequency range, a switching command is issued, and timing begins to obtain the timing time. The switching device switches the current winding (i.e., the winding currently participating in the operation) to the target winding (i.e., the target winding that needs to participate) according to the control command. During the switching process from the current winding to the target winding, the output voltage of the inverter at the drive end of the compressor is adjusted. The voltage reduction control obtains a first reduced voltage. If the timing time has not reached the set delay time, the voltage reduction control on the inverter output voltage at the compressor drive end continues to obtain a second reduced voltage, or the inverter output voltage is maintained at the first reduced voltage. This cycle continues until the timing time reaches the set delay time. If the timing time reaches the set delay time, the motor control parameters are switched from the control parameters of the current winding to the control parameters of the target winding. Thus, by adjusting the compressor's operating frequency and the inverter's output voltage when the compressor needs to switch windings, winding switching can be performed without stopping the compressor. This avoids restarting the compressor after it stops to switch windings, which would cause restart failure, thus improving the compressor's operational reliability and user experience.

[0106] According to an embodiment of the present invention, a compressor control device corresponding to the compressor control method is also provided. See also Figure 6 The diagram shows a structural schematic of an embodiment of the device of the present invention. The compressor has a winding unit and a switching device (i.e., the winding end of the compressor has a winding unit and a switching device). The winding unit has at least two windings. The switching device is used to switch the winding currently engaged in operation within the winding unit from the current winding to a target winding. The current winding is the winding currently engaged in operation within the winding unit, and the target winding is the winding that will be engaged in operation in the future. In the case where at least two windings include a first winding and a second winding, the current winding is like the first winding, and the target winding is like the second winding. In the solution of the present invention, as... Figure 6 As shown, the control device for 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 is located, acquire the operating frequency of the compressor, and acquire the output voltage of the inverter in the drive terminal of the compressor. Where the system in which the compressor is located is an air conditioning control system, the system parameters of the system include the indoor and outdoor temperature difference of the air conditioning environment. For the specific functions and processing of the acquisition unit 102, please refer to step S110.

[0108] The control unit 104 is 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; wherein, the winding switching condition of the compressor refers to the condition for 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 described in step S120.

[0109] The control unit 104 is further configured to, if it is determined that the winding switching conditions of the compressor have been met, adjust the operating frequency of the compressor and the output voltage of the inverter, and control the switching device to operate, so as to switch the working winding in the winding unit from the current winding to the target winding, thereby achieving the switching of the working winding in the winding unit from the current winding to the target winding without stopping 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 stopping and restarting and the possibility of starting failure. It solves the problem that restarting the compressor after stopping may cause starting failure due to system load. Furthermore, when the compressor is used in an air conditioner, it will not cause temperature fluctuations, thus solving the problem of temperature fluctuations caused by stopping and switching.

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

[0112] The control unit 104 is further configured to determine whether the system parameters of the system containing the compressor have reached a set parameter threshold. The specific functions and processing of the control unit 104 are further described 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 parameters of the system in which the compressor is located have reached a set parameter threshold. The specific functions and processing of the control unit 104 are further described in step S220.

[0114] The control unit 104 is further configured to determine that the winding switching condition of the compressor has not been met if it is determined that the system parameters of the system in which the compressor is located have not reached the set parameter threshold. The specific functions and processing of this control unit 104 are further described in step S230.

[0115] Figure 7 This is a schematic flowchart illustrating an embodiment of a compressor winding switching control method according to the present invention. Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which include:

[0116] Step 1: Determine whether the system has met the switching conditions. Only after the system has met the switching conditions will the compressor winding switching control be executed.

[0117] The switching conditions vary depending on the compressor's usage scenario. For example, when the compressor is used in an air conditioner, the difference between the set indoor temperature and the detected actual temperature can be used as the switching condition. Specifically, when the air conditioner is first turned on, the difference between the set indoor temperature and the detected actual temperature is large, requiring the compressor to operate at a higher frequency. In this case, a winding that allows the compressor to operate at a higher frequency, such as the first winding, can be used. After the air conditioner has been running for a while, the difference between the set indoor temperature and the detected actual temperature is small, and the compressor can operate at a lower frequency to meet the usage requirements. In this case, a winding that allows the compressor to operate at a lower frequency, such as the first winding, can be used.

[0118] In the solution of this invention, the winding switching condition of the compressor is determined based on the system parameters of the system in which the compressor is located. This method is applicable to different scenarios of the system in which the compressor is located. The timing of the winding switching of the compressor is determined based on the system parameters of the system in which the compressor is located under different scenarios. This method 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 work, so as to switch the working winding in the winding unit from the current winding to the target winding. Thus, the working winding in the winding unit can be switched from the current winding to the target winding without stopping the compressor. This is beneficial to improving the reliability and stability of the compressor operation, thereby enabling the compressor to work without stopping and improving the user experience.

[0119] In some embodiments, the control unit 104, upon determining that the winding switching conditions of the compressor have been met, adjusts the operating frequency of the compressor and the output voltage of the inverter, and controls the switching device to operate, so as to switch the windings participating in the operation of the winding unit from the current windings to the target windings, including:

[0120] The control unit 104 is further configured to, upon determining that the winding switching conditions of the compressor have been met, adjust the operating frequency of the compressor; then, issue a winding switching command and start timing to obtain the timing time; wherein, the winding switching command is used to control the switching device to switch 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 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 command, so as to switch the working winding in the winding unit from the current winding to the target winding; and, during the process of switching the working winding in the winding unit from the current winding to the target winding, to adjust the output voltage of the inverter. 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 switch the control parameters of the compressor from those controlling the current winding to those controlling the target winding. This completes the winding switching control, changing the winding involved in the operation of the winding unit from the current winding to the target winding. The specific functions and processing of this control unit 104 are further described in step S330.

[0123] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0124] In step 1, once the switching conditions are met, the compressor's operating frequency is first controlled to reach the set frequency range, and then step 2 is executed.

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

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

[0127] In the present invention, after the compressor system (such as the control system of an air conditioner) reaches the switching conditions, the controller for controlling the compressor (such as the controller of the compressor system) first controls the compressor's operating frequency to reach the set frequency range, and then sends a winding cutting command to the compressor winding switching device. After the compressor's operating frequency reaches the set frequency range, and the compressor is running smoothly and safely, the winding switching command is then issued, thereby ensuring the smoothness and reliability of the compressor winding switching.

[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 further described in step S410.

[0130] The control unit 104 is further configured to determine that the adjustment of the compressor's operating frequency has been completed if it is determined that the compressor's operating frequency is within a set frequency range. The specific functions and processing of this control unit 104 are further described 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 the upper limit of the set frequency range, and determine whether the operating frequency of the compressor is less than the lower limit of the set frequency range. The specific functions and processing of this control unit 104 are further described in step S430.

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

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

[0134] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0135] In step 1, once the switching conditions are met, the compressor's operating frequency is first controlled to reach the set frequency range, and then step 2 is executed to issue a switching command.

[0136] The compressor's operating frequency cannot be too low, otherwise it will easily shut down. For example, the compressor's operating frequency can be controlled 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 compressor control device of the present invention further includes: the control unit 104 is further configured to start timing to obtain timing time when a winding switching command is issued; preferably, timing is started at the same time as the winding switching command is issued to obtain timing time.

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

[0140] The control unit 104 is further configured to weaken 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. The specific functions and processing of the control unit 104 are further described in step S510.

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

[0142] The control unit 104 is further configured to, if it is determined that the timing time has reached a set delay time, then determine that the adjustment of the inverter's output voltage has been completed, and that is, stop adjusting the inverter's output voltage. The specific functions and processing of this control unit 104 are further described in step S530.

[0143] The control unit 104 is further configured to, 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 weakening the output voltage of the inverter until the timing time reaches the set delay time. The specific functions and processing of this control unit 104 are further described in step S540.

[0144] In other words, the compressor control method described in this invention further includes: starting a timer to obtain a timing duration when a winding switching command is issued; preferably, starting the timer simultaneously with issuing the winding switching command; adjusting the output voltage of the inverter, specifically: adjusting the output voltage of the inverter in conjunction with the timing duration. That is, adjusting 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; then, determining whether the timing duration has reached a set delay time; if it is determined that the timing duration has reached the set delay time, then it is determined that the adjustment of the inverter's output voltage has been completed, i.e., the adjustment of the inverter's output voltage is stopped; if it is determined that the timing duration has not reached the set delay time, then waiting until the timing duration reaches the set delay time; or returning to continue adjusting the inverter's output voltage until the timing duration reaches the set delay time.

[0145] like Figure 7 As shown, the present invention proposes a compressor winding switching control method, the specific operation steps of which further include:

[0146] In step 2, once the rotational speed reaches the set range, i.e., when the compressor's operating frequency reaches the set frequency range, the controller sends a switching command to the switching device and simultaneously starts timing to obtain the timing time so that the delay begins, after which step 3 is executed. The control method for the compressor's operating frequency to reach the set frequency range needs to be tailored according to the compressor's operating frequency. For example, when the compressor's operating frequency is high, it needs to be reduced to reach the set frequency range; when the compressor's operating frequency is low, it needs to be increased to reach the set frequency range.

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

[0148] In step 3, after the controller issues a switching command, voltage reduction control is applied to the output voltage of the inverter in the compressor drive system and maintained for a certain period of time until the switching device of the compressor windings completes the switching. The voltage reduction control duration is the time from issuing the switching command to the completion of the winding switching by the switching device. The duration of the voltage reduction control is related to the response time and action time of the switching device.

[0149] The compressor winding switching device can be constructed using relays, or it can be constructed using devices such as insulated-gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs). The compressor winding switching device can employ relevant switching devices in this field. Different switching devices have different response times and operating times. Generally, relays are in the millisecond range, while IGBTs or MOSFETs are in the microsecond range. The response and operating times can be measured in advance.

[0150] Step 4: Determine if the timing has reached the set delay time, i.e., determine if the delay has ended. If yes, proceed to Step 5; otherwise, continue waiting in Step 4 until the delay ends. Alternatively, return to Step 3 and continue voltage reduction control on the inverter output voltage at the compressor drive end during the switching from the current winding to the target winding until the delay ends. In the solution of this invention, the inverter output voltage is reduced before the delay ends, and then Step 5 is executed.

[0151] Step 5: Update the controller parameters to match the parameters corresponding to the switched motor state, then return to Step 2 to check if the delay has ended. In other words, before the switching device completes the switching, execute Step 4 (which can be repeated) and Step 5.

[0152] In the present invention, a timing period is started when a winding switching command is issued to obtain the timing time; during the process of switching the working winding in the winding unit from the current winding to the target winding, if the timing time has not reached the preset delay time, the output voltage of the inverter is adjusted so that the output voltage of the inverter is stabilized within a safe range before the winding switching is completed. This ensures both the uninterrupted operation of the compressor and the safety of the winding switching.

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

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

[0155] In step 3, it is assumed that the controller calculates the output voltage of the inverter as voltage Vcalc according to a preset control algorithm, and a weakening coefficient k is preset. After the controller issues a switching command, the actual output voltage Vout of the inverter is controlled to be Vout=k*Vcalc, where 0<k<1. The weakening coefficient k needs to be selected according to actual conditions. If the weakening coefficient k is too small, the inhibition effect on current peaks is strong, but it may easily cause shutdown; if the weakening coefficient k is too large, current peaks may occur.

[0156] In the solution of the present invention, timing is started to obtain timing time when a winding switching instruction is issued; in the process of switching the working winding in said winding unit from the current winding to the target winding, when the timing time does not reach a preset delay time, the output voltage of said inverter is adjusted by performing weakening control on the output voltage of said inverter, so that the output voltage of said inverter is stabilized within a safe range before winding switching is completed, which ensures the safety of winding switching under the condition that the compressor operates without shutdown.

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

[0158] Wherein, the motor parameters of said motor comprise at least one of a resistance of said motor, d-axis and q-axis inductances of said motor, and a back electromotive force coefficient of said motor. The control loop parameters of said motor comprise at least one of parameters of a PI module of a speed loop of said motor, parameters of a PI module of a current loop of said motor, and parameters of an observer of said motor.

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

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

[0161] 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 EMF coefficient; the loop parameters include the PI (proportional-integral) parameters of the speed loop and current loop, as well as the observer parameters.

[0162] Figure 8 This is a schematic diagram of the winding switching current waveform before using the winding switching control method for a compressor according to the present invention. Figure 9 This is a schematic diagram of the winding switching current waveform after using the 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, i.e., suitable for switching motor windings of various connection forms. For example, the winding switching control scheme for a switching winding compressor proposed in this invention can be applied to star-delta switching, series-parallel switching, and various other combined switching, such as switching between multiple sets of windings, similar to switching from the first winding to the second winding, etc. Figure 8 and Figure 9 The figure shows the switching current waveform of a compressor with star-delta switching.

[0163] The present invention proposes a winding switching control scheme for a switching compressor, which can achieve winding switching without stopping the compressor. The switching process is free of current spikes and will not cause abnormal protection of the controller. Figure 8 and Figure 9 These are the current waveforms switching at a frequency of 50Hz. Figure 8 There are obvious current spikes, which can reach 10.25A; Figure 9 After using the compressor winding switching control method of the present invention, the switching is smooth, there are no current spikes, and the current spikes are effectively suppressed.

[0164] like Figure 8 As shown, before using a compressor winding switching control method, current spikes are generated during switching; such as Figure 9 As shown, after using the winding switching control method of the compressor of the present invention, the current spikes are effectively suppressed, and the effect is significant.

[0165] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in 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 a control device for a compressor is also provided. This compressor may include the control device for the compressor described above.

[0167] Since the processing and functions implemented by the compressor in this embodiment are basically the same as those in the embodiments, principles and examples of the aforementioned device, any details not covered in this embodiment can be found in 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 corresponding to a compressor control device is also provided. This air conditioner may include: the compressor control device described above, or the compressor described above.

[0169] Since the processing and functions implemented by the air conditioner in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned device, any details not covered in the description of this embodiment can be found in 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 also provided, comprising a computer program that, when executed by a processor, implements the steps of the compressor control method described above.

[0171] Since the processing and functions implemented by the product in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in 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, the storage medium including a stored program, wherein, when the program is executed, the device where the storage medium is located controls the execution of the steps of the compressor control method described above.

[0173] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0174] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0175] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling a compressor, characterized in that, 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 windings that are working in the winding unit from the current winding to the target winding. The control method for the compressor includes: The system parameters of the system containing the compressor are obtained, the operating frequency of the compressor is obtained, and the output voltage of the inverter in the drive terminal of the compressor is obtained; the system parameters of the system containing the compressor include: the difference between the set temperature of the indoor environment of the air conditioner and the detected actual temperature; Based on the system parameters of the system in which the compressor is located, determine whether the winding switching conditions of the compressor have been met; If it is determined that the winding switching condition of the compressor has been met, the operating frequency of the compressor is first adjusted to the set frequency range; then, a winding switching command is issued; when the winding switching command is issued, timing begins to obtain the timing time. The switching device is controlled to operate according to the winding switching command; and the output voltage of the inverter is adjusted, including: weakening the output voltage of the inverter; determining whether the timing time has reached the set delay time; if it is determined that the timing time has reached the set delay time, then it is determined that the adjustment of the output voltage of the inverter has been completed. The control parameters for the compressor are switched from those controlling the current winding to those controlling the target winding. This completes the winding switching control that switches the working winding in the winding unit from the current winding to the target winding.

2. The compressor control method according to claim 1, characterized in that, Based on the system parameters of the system in which the compressor is located, determine whether the winding switching conditions of the compressor have been met, including: Determine whether the system parameters of the system containing the compressor have reached the set parameter thresholds; If it is determined that the system parameters of the system in which the compressor is located have reached the set parameter threshold, then it is determined that the winding switching condition of the compressor has been met. If it is determined that the system parameters of the system in which the compressor is located have not reached the set parameter threshold, then it is determined that the winding switching condition of the compressor has not been met.

3. The compressor control method according to claim 1, characterized in that, Adjusting the operating frequency of the compressor includes: Determine whether the operating frequency of the compressor is within the set frequency range; If it is determined that the operating frequency of the compressor is within the set frequency range, then 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, then 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. If it is determined that the operating frequency of the compressor is greater than the upper limit of the set frequency range, then the operating frequency of the compressor is controlled to be reduced to 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, then the operating frequency of the compressor is controlled to be increased to the set frequency range.

4. The compressor control method according to claim 1, characterized in that, Adjusting the output voltage of the inverter also includes: If it is determined that the timing time has not reached the set delay time, then 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.

5. The compressor control method according to claim 4, characterized in that, The output voltage of the inverter is reduced by controlling the voltage reduction, including: The output voltage of the inverter is adjusted to be the product of the inverter's output voltage and a set attenuation coefficient; the set attenuation coefficient is greater than 0 and less than 1.

6. The compressor control method according to claim 1, characterized in that, The control parameters of the compressor include at least one of the following: motor parameters of the motor in the compressor, control loop parameters of the motor in the compressor, and output voltage of the inverter in the drive terminal of the compressor. The motor parameters of the motor include at least one of the following: the resistance of the motor, the d-axis and q-axis inductance of the motor, and the back EMF coefficient of the motor. The control loop parameters of the motor include at least one of the following: parameters of the PI module of the motor's speed loop, parameters of the PI module of the motor's current loop, and parameters of the motor's observer.

7. A compressor control device for controlling a compressor using the compressor control method as described in any one of claims 1 to 6, characterized in that, 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 windings that are working in the winding unit from the current winding to the target winding. The control device for the compressor includes: The acquisition unit is 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 drive terminal of the compressor. The control unit is configured to determine, based on the system parameters of the system in which the compressor is located, whether the winding switching conditions of the compressor have been met. The control unit is further configured to, if it is determined that the winding switching conditions of the compressor have been met, adjust the operating frequency of the compressor and the output voltage of the inverter, and control the switching device to operate, so as to switch the windings participating in the operation of the winding unit from the current windings to the target windings.

8. A compressor, characterized in that, include: The compressor control device as described in claim 7.

9. An air conditioner, characterized in that, include: The control device for the compressor as described in claim 7, or the compressor as described in claim 8.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the compressor control method according to any one of claims 1 to 6.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the compressor control method according to any one of claims 1 to 6.

Images