Low-frequency torque compensation control method and device for single-rotor compressor
Patent Information
- Application Number
- CN202411985139.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-03-25
Smart Images
Figure CN119686988A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of equipment control, and in particular to a low-frequency torque compensation control method and device for a single-rotor compressor. Background Art
[0002] In some low-power heat pump or air conditioning systems, single-rotor compressors are used to reduce costs. Single-rotor compressors are periodically loaded and unloaded during operation, and their load changes greatly. At low speeds, especially below 40Hz, the operating vibration is large, and often causes resonance in the pipeline system, resulting in pipeline breakage and huge noise. Summary of the invention
[0003] The present invention provides a low-frequency torque compensation control method and device for a single-rotor compressor, which are used to solve the defects of the single-rotor compressor in the prior art that the single-rotor compressor has large vibration and noise when running at low frequency, and realize a simple and effective control strategy to compensate for load torque changes.
[0004] The present invention provides a low-frequency torque compensation control method for a single-rotor compressor, comprising:
[0005] Generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, wherein the period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor;
[0006] According to a predetermined relationship curve between the operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor, the amplitude and phase corresponding to the current operating frequency point are determined;
[0007] The amplitude and phase corresponding to the current operating frequency point are substituted into the sinusoidal signal, and the sinusoidal signal is used as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0008] According to a single-rotor compressor low-frequency torque compensation control method provided by the present invention, before generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, the method further includes:
[0009] The mechanical period of the single-rotor compressor is calculated according to the pole pair number and the electrical period of the single-rotor compressor.
[0010] According to a low-frequency torque compensation control method for a single-rotor compressor provided by the present invention, the position of the minimum speed point, the maximum speed point or the intermediate speed point of the single-rotor compressor in the electrical cycle corresponding to the mechanical cycle is used as the starting position of the mechanical cycle.
[0011] According to a low-frequency torque compensation control method for a single-rotor compressor provided by the present invention, a sinusoidal signal is generated according to the mechanical angle of the single-rotor compressor by the following formula:
[0012] Iq_Comp=K*sin(ω sod +θ Offset );
[0013] Wherein, Iq_Comp is the sinusoidal signal, which is used as the torque compensation signal; K is the amplitude of the sinusoidal signal, which is used as the compensation amplitude; θ Offset is the phase of the sinusoidal signal, as the compensation angle, ω sod is the mechanical angle of the single-rotor compressor.
[0014] According to a single-rotor compressor low-frequency torque compensation control method provided by the present invention, before determining the amplitude and phase corresponding to the current operating frequency point according to the relationship curve between the predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal and the current operating frequency point of the single-rotor compressor, the method further includes:
[0015] Using the sinusoidal signal as an increment of a current loop of the single-rotor compressor, and measuring vibration and noise of the single-rotor compressor;
[0016] For each operating frequency point of the single-rotor compressor, adjusting the amplitude and phase of the sinusoidal signal so that the vibration and noise of the single-rotor compressor are minimized;
[0017] The adjusted amplitudes and phases of all operating frequency points are fitted to obtain a relationship curve between the operating frequency point and the amplitude and phase of the sinusoidal signal.
[0018] According to a single-rotor compressor low-frequency torque compensation control method provided by the present invention, the step of substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal comprises:
[0019] Determining the load size of the single-rotor compressor according to the system current size of the single-rotor compressor;
[0020] determining a load state of the single-rotor compressor according to the load magnitude;
[0021] When the load state is a heavy load state, increasing the amplitude corresponding to the current operating frequency point;
[0022] When the load state is a light load state, reducing the amplitude corresponding to the current operating frequency point;
[0023] The adjusted amplitude and phase corresponding to the current operating frequency point are substituted into the sinusoidal signal.
[0024] According to a single-rotor compressor low-frequency torque compensation control method provided by the present invention, the calculation formula of the sinusoidal signal is as follows:
[0025] Iq_Comp=K power *K*sin(ω sod +θ Offset );
[0026] Among them, Iq_Comp is the final sinusoidal signal, K is the amplitude corresponding to the current operating frequency point, θ Offset is the phase corresponding to the current operating frequency point, ω sod is the mechanical angle of the single rotor compressor, K power is the correction coefficient of K, which is dynamically adjusted according to the load size.
[0027] According to a low-frequency torque compensation control method for a single-rotor compressor provided by the present invention, the correction coefficient K power The calculation formula is as follows:
[0028] K power =I real / I rated ;
[0029] Among them, I real is the current system current of the single-rotor compressor, I real is the rated current of the single-rotor compressor.
[0030] The present invention also provides a low-frequency torque compensation control device for a single-rotor compressor, comprising:
[0031] A generating module, configured to generate a sinusoidal signal according to a mechanical angle of a single-rotor compressor, wherein a period of the sinusoidal signal is consistent with a mechanical period of the single-rotor compressor;
[0032] A calculation module, configured to determine the amplitude and phase corresponding to the current operating frequency point according to a predetermined relationship curve between the operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor;
[0033] The compensation module is used to substitute the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and use the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0034] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the low-frequency torque compensation control method for a single-rotor compressor as described above is implemented.
[0035] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the low-frequency torque compensation control method for a single-rotor compressor as described in any one of the above methods is implemented.
[0036] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above-mentioned single-rotor compressor low-frequency torque compensation control methods.
[0037] The low-frequency torque compensation control method and device for a single-rotor compressor provided by the present invention generate a sinusoidal signal according to the mechanical angle of the single-rotor compressor, and determine the amplitude and phase required to reduce the vibration and noise of the single-rotor compressor according to the current operating frequency point and the torque compensation curve of the single-rotor compressor, thereby simulating the compensation signal to be added to a given reference torque. This can significantly reduce the vibration and noise problems in the low-frequency band of the single-rotor compressor, expand the speed operating range of the single-rotor compressor, do not increase any hardware costs, reduce the risk of pipeline damage, and improve system stability and customer experience. In addition, the control strategy is simple and effective, does not require a large number of complex calculations, does not consume chip resources, and has good adaptability and anti-interference capabilities. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0039] Figure 1 It is a flow chart of a low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0040] Figure 2 It is a schematic diagram of the torque variation process within one mechanical cycle in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0041] Figure 3 It is a schematic diagram of a sinusoidal signal, a signal period and a mechanical period in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0042] Figure 4 It is one of the schematic diagrams of signal period and mechanical period in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0043] Figure 5 This is the second schematic diagram of the signal period and the mechanical period in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0044] Figure 6 This is the third schematic diagram of the signal period and the mechanical period in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0045] Figure 7 It is a schematic diagram of a torque compensation curve in the low-frequency torque compensation control method for a single-rotor compressor provided by the present invention;
[0046] Figure 8 It is a schematic diagram of the system structure of a single-rotor compressor in the low-frequency torque compensation control method of a single-rotor compressor provided by the present invention;
[0047] Fig. 9 It is a schematic diagram of the speed curve when the torque compensation is not turned on and after the torque compensation is turned on at 25Hz in the low-frequency torque compensation control method of the single-rotor compressor provided by the present invention;
[0048] Fig.10 It is a structural schematic diagram of a low-frequency torque compensation control device for a single-rotor compressor provided by the present invention;
[0049] Fig.11 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION
[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0051] Combine the following Figure 1 A single-rotor compressor low-frequency torque compensation control method of the present invention comprises:
[0052] Step 101, generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, wherein the period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor;
[0053] The basic idea of the present invention is to first deduce the mechanical angle period from the electrical angle period. Once the mechanical period is determined, a compensation curve simulating the load change can be added to the given reference torque based on the characteristic that the load change curve during the compressor exhaust and intake process is similar to a sine curve. Figure 2 It is the torque change process within one mechanical cycle.
[0054] After determining the mechanical period of the single-rotor compressor, an amplitude K and phase θ are generated according to the mechanical angle of the single-rotor compressor. OffsetThe adjustable signal period is a sinusoidal signal of the mechanical period of the single-rotor compressor. This sinusoidal signal is used as the increment Iq_Comp given by the current loop for torque compensation.
[0055] The generated sinusoidal signal changes with time as Figure 3 As shown by the purple line in the figure, the mechanical angle of the single-rotor compressor changes with time. Figure 3 As shown by the yellow line in Figure 3 It can be seen that the signal period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor.
[0056] Step 102, determining the amplitude and phase corresponding to the current operating frequency point according to a predetermined relationship curve between the operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor;
[0057] Different compressors have different torque compensation parameters (amplitude and phase), and different frequency bands have different compensation amplitudes. Therefore, it is necessary to test the amplitude and phase required to reduce the vibration and noise of the single-rotor compressor, so as to fit the relationship curve between the amplitude and phase required to be compensated and the operating frequency point of the rotor compressor, that is, the torque compensation curve.
[0058] According to the current operating frequency point of the single-rotor compressor, the torque compensation curve is used to automatically calculate the appropriate torque compensation parameters.
[0059] Step 103: Substitute the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and use the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0060] Substituting the torque compensation parameter calculated by the torque compensation curve into the sinusoidal signal, a torque compensation signal is obtained. The torque compensation signal is used as an increment given by the current loop to control the operation of the single-rotor compressor, so as to reduce the vibration and noise of the single-rotor compressor.
[0061] This embodiment generates a sinusoidal signal according to the mechanical angle of the single-rotor compressor, and determines the amplitude and phase required to reduce the vibration and noise of the single-rotor compressor according to the current operating frequency point and torque compensation curve of the single-rotor compressor, thereby simulating the compensation signal to be added to the given reference torque, which can significantly reduce the vibration and noise problems in the low-frequency band of the single-rotor compressor, expand the speed operating range of the single-rotor compressor, does not increase any hardware costs, reduces the risk of pipeline damage, and improves system stability and customer experience; in addition, the control strategy is simple and effective, does not require a large number of complex calculations, does not consume chip resources, and has good adaptability and anti-interference capabilities.
[0062] Based on the above embodiment, before generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, this embodiment further includes:
[0063] The mechanical period of the single-rotor compressor is calculated according to the pole pair number and the electrical period of the single-rotor compressor.
[0064] There is a relationship between the electrical cycle and mechanical cycle of a single-rotor compressor in terms of the number of pole pairs. For example, if a single-rotor compressor of a certain model has 3 pole pairs, then 3 electrical cycles equal one mechanical cycle. The mechanical cycle is calculated based on the relationship between the electrical cycle and the mechanical cycle.
[0065] The mechanical period is calculated as follows:
[0066] T spd =P*T ω ;
[0067] Among them, T spd is the mechanical speed cycle of the single-rotor compressor, P is the number of pole pairs of the single-rotor compressor, T ω is the electrical speed cycle of the single-rotor compressor.
[0068] Figure 4 In the figure, the yellow line is the mechanical period and the purple line is the electrical period, and the two are in a logarithmic relationship.
[0069] Based on the above embodiments, in this embodiment, the position of the minimum speed point, the maximum speed point or the intermediate speed point of the single-rotor compressor in the electrical cycle corresponding to the mechanical cycle is used as the starting position of the mechanical cycle.
[0070] After calculating the mechanical cycle based on the electrical cycle, it is necessary to determine the starting position of the mechanical cycle. Through observation, it is found that within a mechanical cycle (3 electrical cycles), the mechanical speed changes in a small, medium, and large pattern. Figure 5 As shown in the figure, the yellow line is the electrical speed cycle, and the purple line is the mechanical speed cycle. Based on this rule, the change relationship of the three mechanical speeds can be calculated, and one of the speed points is taken as the starting point of the mechanical cycle.
[0071] According to the above principle, the starting position of the mechanical cycle can be basically locked, and it can be locked in the waveform position in the figure below in different frequency bands and each start-up operation. Figure 6 The purple line in the middle is the mechanical speed, and the yellow line is the mechanical cycle. The highest speed point among the three electrical cycles can be taken as the starting point of the mechanical cycle.
[0072] Based on the above embodiment, in this embodiment, a sinusoidal signal is generated according to the mechanical angle of the single-rotor compressor by using the following formula:
[0073] Iq_Comp=K*sin(ω sod +θ Offset );
[0074] Wherein, Iq_Comp is the sinusoidal signal, which is used as the torque compensation signal; K is the amplitude of the sinusoidal signal, which is used as the compensation amplitude; θ Offset is the phase of the sinusoidal signal, as the compensation angle, ω sod is the mechanical angle of the single-rotor compressor.
[0075] On the basis of the above embodiment, in this embodiment, before determining the amplitude and phase corresponding to the current operating frequency point according to the relationship curve between the predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal and the current operating frequency point of the single-rotor compressor, the further comprises:
[0076] Using the sinusoidal signal as an increment of a current loop of the single-rotor compressor, and measuring vibration and noise of the single-rotor compressor;
[0077] For each operating frequency point of the single-rotor compressor, adjusting the amplitude and phase of the sinusoidal signal so that the vibration and noise of the single-rotor compressor are minimized;
[0078] The adjusted amplitudes and phases of all operating frequency points are fitted to obtain a relationship curve between the operating frequency point and the amplitude and phase of the sinusoidal signal.
[0079] For each operating frequency point of the single-rotor compressor, adjust the torque amplitude K and phase θ Offset , to achieve the lowest vibration and noise, and then based on the adjusted amplitude K and phase θ Offset Fit a torque compensation curve. Use the torque compensation curve to automatically calculate the appropriate torque compensation parameters based on the given operating frequency point.
[0080] For example, according to the torque compensation curve debugged by a certain model of single-rotor compressor Figure 7 As shown, the phase θ Offset The effect is best when it is 0.
[0081] Based on the above embodiment, the step of substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal in this embodiment includes:
[0082] Determining the load size of the single-rotor compressor according to the system current size of the single-rotor compressor;
[0083] determining a load state of the single-rotor compressor according to the load magnitude;
[0084] When the load state is a heavy load state, increasing the amplitude corresponding to the current operating frequency point;
[0085] When the load state is a light load state, reducing the amplitude corresponding to the current operating frequency point;
[0086] The adjusted amplitude and phase corresponding to the current operating frequency point are substituted into the sinusoidal signal.
[0087] Since factors such as ambient temperature have a great influence on the heat pump load, the load may be very different at the same operating frequency. The load size can be judged by the size of the system current. In the case of heavy load, the compensation amplitude should be appropriately increased, and in the case of light load, the compensation amplitude should be appropriately reduced. This embodiment does not limit the specific method for adjusting the amplitude.
[0088] Based on the above embodiment, the calculation formula of the sinusoidal signal in this embodiment is as follows:
[0089] Iq_Comp=K power *K*sin(ω sod +θ Offset );
[0090] Among them, Iq_Comp is the final sinusoidal signal, K is the amplitude corresponding to the current operating frequency point, θ Offset is the phase corresponding to the current operating frequency point, usually between -90° and 90°, ω sod is the mechanical angle of the single-rotor compressor, obtained by calculating the electrical angle, K power is the correction coefficient of K, which is dynamically adjusted according to the load size.
[0091] Based on the above embodiment, the correction coefficient K in this embodiment is power The calculation formula is as follows:
[0092] K power =I real / I rated ;
[0093] Among them, I real is the current system current of the single-rotor compressor, I real is the rated current of the single-rotor compressor.
[0094] First fit the system current curve under rated condition, then compare the current system current with the rated current to get the correction factor K power . Use this correction factor to adjust the compensation amplitude.
[0095] When the load increases, K powerIt becomes larger, otherwise it becomes smaller, so the compensation amplitude can be dynamically adjusted according to the load size.
[0096] Figure 8 It is a schematic diagram of the system structure of a single-rotor compressor. The final sinusoidal signal Iq_Comp is used as the increment given by the reference signal Iq_Ref of the current loop to control the operation of the single-rotor compressor without adding other hardware.
[0097] Fig. 9 This is a schematic diagram of the speed curve when torque compensation is not turned on and turned on at 25Hz. It can be clearly seen that after turning on torque compensation, the speed fluctuation amplitude becomes much smaller, and the vibration amplitude of the system pipeline is also significantly reduced, and the pipeline vibration is basically not felt.
[0098] The single-rotor compressor low-frequency torque compensation control device provided by the present invention is described below. The single-rotor compressor low-frequency torque compensation control device described below and the single-rotor compressor low-frequency torque compensation control method described above can be referenced to each other.
[0099] like Fig.10 As shown, the device includes a generating module 1001, a calculating module 1002 and a compensating module 1003, wherein:
[0100] The generating module 1001 is used to generate a sinusoidal signal according to the mechanical angle of the single-rotor compressor, wherein the period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor;
[0101] The calculation module 1002 is used to determine the amplitude and phase corresponding to the current operating frequency point according to the relationship curve between the predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor;
[0102] The compensation module 1003 is used to substitute the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and use the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0103] This embodiment generates a sinusoidal signal according to the mechanical angle of the single-rotor compressor, and determines the amplitude and phase required to reduce the vibration and noise of the single-rotor compressor according to the current operating frequency point and torque compensation curve of the single-rotor compressor, thereby simulating the compensation signal to be added to the given reference torque, which can significantly reduce the vibration and noise problems in the low-frequency band of the single-rotor compressor, expand the speed operating range of the single-rotor compressor, does not increase any hardware costs, reduces the risk of pipeline damage, and improves system stability and customer experience; in addition, the control strategy is simple and effective, does not require a large number of complex calculations, does not consume chip resources, and has good adaptability and anti-interference capabilities.
[0104] Fig.11 An example of a physical structure diagram of an electronic device is shown in FIG. Fig.11 As shown, the electronic device may include: a processor 1110, a communication interface 1120, a memory 1130 and a communication bus 1140, wherein the processor 1110, the communication interface 1120 and the memory 1130 communicate with each other through the communication bus 1140. The processor 1110 may call the logic instructions in the memory 1130 to execute the low-frequency torque compensation control method of the single-rotor compressor, the method comprising: generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, the period of the sinusoidal signal being consistent with the mechanical period of the single-rotor compressor; determining the amplitude and phase corresponding to the current operating frequency point according to the relationship curve between the predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor; substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and using the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0105] In addition, the logic instructions in the above-mentioned memory 1130 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.
[0106] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the single-rotor compressor low-frequency torque compensation control method provided by the above-mentioned methods, the method including: generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, the period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor; determining the amplitude and phase corresponding to the current operating frequency point according to a relationship curve between a predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor; substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and using the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0107] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the low-frequency torque compensation control method for a single-rotor compressor provided by the above-mentioned methods, the method comprising: generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, the period of the sinusoidal signal being consistent with the mechanical period of the single-rotor compressor; determining the amplitude and phase corresponding to the current operating frequency point according to a relationship curve between a predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor; substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and using the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
[0108] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.
[0109] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.
[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A low-frequency torque compensation control method for a single-rotor compressor, characterized in that: include: Generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, wherein the period of the sinusoidal signal is consistent with the mechanical period of the single-rotor compressor; According to a predetermined relationship curve between the operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor, the amplitude and phase corresponding to the current operating frequency point are determined; The amplitude and phase corresponding to the current operating frequency point are substituted into the sinusoidal signal, and the sinusoidal signal is used as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
2. The low-frequency torque compensation control method for a single-rotor compressor according to claim 1, characterized in that: Before generating a sinusoidal signal according to the mechanical angle of the single-rotor compressor, the method further includes: The mechanical period of the single-rotor compressor is calculated according to the pole pair number and the electrical period of the single-rotor compressor.
3. The low-frequency torque compensation control method for a single-rotor compressor according to claim 2, characterized in that: The position of the minimum speed point, the maximum speed point or the intermediate speed point of the single-rotor compressor in the electrical cycle corresponding to the mechanical cycle is used as the starting position of the mechanical cycle.
4. The low-frequency torque compensation control method for a single-rotor compressor according to claim 1, characterized in that: The sinusoidal signal is generated from the mechanical angle of a single-rotor compressor using the following formula: Iq_Comp=K*sin(ω sod +θ Offset ); Wherein, Iq_Comp is the sinusoidal signal, which is used as the torque compensation signal; K is the amplitude of the sinusoidal signal, which is used as the compensation amplitude; θ Offset is the phase of the sinusoidal signal, as the compensation angle, ω sod is the mechanical angle of the single-rotor compressor.
5. The low-frequency torque compensation control method for a single-rotor compressor according to claim 1, characterized in that: Before determining the amplitude and phase corresponding to the current operating frequency point according to the relationship curve between the predetermined operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal and the current operating frequency point of the single-rotor compressor, the method further includes: Using the sinusoidal signal as an increment of a current loop of the single-rotor compressor, and measuring vibration and noise of the single-rotor compressor; For each operating frequency point of the single-rotor compressor, adjusting the amplitude and phase of the sinusoidal signal so that the vibration and noise of the single-rotor compressor are minimized; The adjusted amplitudes and phases of all operating frequency points are fitted to obtain a relationship curve between the operating frequency point and the amplitude and phase of the sinusoidal signal.
6. The low-frequency torque compensation control method for a single-rotor compressor according to claim 1, characterized in that: Substituting the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal includes: Determining the load size of the single-rotor compressor according to the system current size of the single-rotor compressor; determining a load state of the single-rotor compressor according to the load magnitude; When the load state is a heavy load state, increasing the amplitude corresponding to the current operating frequency point; When the load state is a light load state, reducing the amplitude corresponding to the current operating frequency point; The adjusted amplitude and phase corresponding to the current operating frequency point are substituted into the sinusoidal signal.
7. The low-frequency torque compensation control method for a single-rotor compressor according to claim 6, characterized in that: The calculation formula of the sinusoidal signal is as follows: Iq_Comp=K power *K*sin(ω sod +θ Offset ); Among them, Iq_Comp is the final sinusoidal signal, K is the amplitude corresponding to the current operating frequency point, θ Offset is the phase corresponding to the current operating frequency point, ω sod is the mechanical angle of the single rotor compressor, K power is the correction coefficient of K, which is dynamically adjusted according to the load size.
8. The low-frequency torque compensation control method for a single-rotor compressor according to claim 7, characterized in that: Correction factor K power The calculation formula is as follows: K power =I real / I rated ; Among them, I real is the current system current of the single-rotor compressor, I real is the rated current of the single-rotor compressor.
9. A low-frequency torque compensation control device for a single-rotor compressor, characterized in that: include: A generating module, configured to generate a sinusoidal signal according to a mechanical angle of a single-rotor compressor, wherein a period of the sinusoidal signal is consistent with a mechanical period of the single-rotor compressor; A calculation module, configured to determine the amplitude and phase corresponding to the current operating frequency point according to a predetermined relationship curve between the operating frequency point of the single-rotor compressor and the amplitude and phase of the sinusoidal signal, and the current operating frequency point of the single-rotor compressor; The compensation module is used to substitute the amplitude and phase corresponding to the current operating frequency point into the sinusoidal signal, and use the sinusoidal signal as the torque compensation signal of the single-rotor compressor to control the operation of the single-rotor compressor.
10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the low-frequency torque compensation control method for a single-rotor compressor as described in any one of claims 1 to 8 is implemented.
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