Frequency conversion equipment control method, frequency conversion equipment and computer readable storage medium

Abstract

The invention provides a frequency conversion equipment control method, frequency conversion equipment and a computer readable storage medium. The frequency conversion equipment control method comprises the following steps: in response to a field weakening control instruction, determining a field weakening control parameter interval of field weakening control parameters corresponding to a current state; determining a current target parameter based on the field weakening control parameter interval and a preset abnormal parameter interval; the preset abnormal parameter interval comprises abnormal parameters corresponding to noise; and controlling the frequency conversion equipment based on the current target parameter. According to the control method of the frequency conversion equipment, when field weakening control is carried out, the current target parameter is determined based on the field weakening control parameter interval and the preset abnormal parameter interval, and due to the fact that the preset abnormal parameter interval comprises the abnormal parameters corresponding to the noise, the abnormal parameters can be removed when the current target parameter is determined; therefore, the noise of frequency conversion equipment in field weakening control is reduced, and the equipment reliability is improved.

Description

Technical Field

[0001] This application relates to the field of frequency converter control technology, and in particular to a frequency converter control method, frequency converter equipment, and computer-readable storage medium. Background Technology

[0002] In variable frequency equipment such as variable frequency air conditioners and heat pumps, the compressor often uses a permanent magnet synchronous motor to achieve wide-frequency and high-efficiency operation. When the compressor operates at high frequency (e.g., frequency greater than 80 Hz), the back electromotive force approaches the DC bus voltage, requiring it to enter a field weakening control mode to maintain stability. If the field weakening capability is insufficient, the control system will trigger frequency reduction protection, limiting the operating frequency to a safe range.

[0003] However, in actual engineering practice, it has been found that while certain frequency points meet the requirements for electrical control safety, they can generate significant noise (such as electromagnetic howling and refrigerant eddy current noise), while other frequencies are prone to causing mechanical resonance or structural vibration (such as housing shaking and pipeline swaying), affecting product reliability. Summary of the Invention

[0004] This application mainly provides a variable frequency drive (VFD) control method, a VFD device, and a computer-readable storage medium. The VFD control method of this application can reduce noise and improve product reliability.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted in this application is: to provide a variable frequency device control method, comprising: In response to the field weakening control command, determine the field weakening control parameter range corresponding to the current state; The current target parameter is determined based on the range of field weakening control parameters and the preset abnormal parameter range; the preset abnormal parameter range includes the abnormal parameters corresponding to noise. Control the frequency converter based on the current target parameters.

[0006] In one embodiment, the field weakening control parameters include frequency control parameters and / or rotational speed control parameters.

[0007] In one embodiment, the field weakening control command is determined based on at least one of field weakening depth, voltage utilization rate, and motor current.

[0008] In one embodiment, the current target parameter is any value within the target parameter range; the target parameter range is the range corresponding to the non-overlapping portion of the weak magnetic control parameter range and the preset abnormal parameter range.

[0009] In one embodiment, the current target parameter is a value within the target parameter range that matches the current operating condition; or, the current target parameter is a value within the target parameter range that matches the noise standard.

[0010] In one embodiment, in response to the target parameter range being empty, the frequency converter control method further includes: Adjust the opening of the electronic expansion valve and / or the speed of the fan.

[0011] In one embodiment, controlling the frequency converter based on current target parameters includes: Based on preset parameters, historical parameters are adjusted to obtain the current target parameters, and the frequency converter is controlled using the current target parameters.

[0012] In one embodiment, the range of field weakening control parameters is determined based on the minimum parameter required to maintain the current operating condition and the maximum parameter allowed under the current operating condition.

[0013] To solve the above-mentioned technical problems, the second technical solution adopted in this application is: to provide a frequency converter, which includes a memory and a processor coupled to each other, the processor being used to execute program instructions stored in the memory, and the processor being used to execute program data to implement the frequency converter control method described above.

[0014] To solve the above-mentioned technical problems, the third technical solution adopted in this application is: to provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the frequency converter control method described above.

[0015] The beneficial effects of this application are as follows: Unlike existing technologies, the variable frequency drive (VFD) equipment control method includes: responding to a field weakening control command, determining a field weakening control parameter range corresponding to the current state; determining a current target parameter based on the field weakening control parameter range and a preset abnormal parameter range; the preset abnormal parameter range includes abnormal parameters corresponding to noise; and controlling the VFD equipment based on the current target parameter. In this application's VFD equipment control method, during field weakening control, the current target parameter is determined based on the field weakening control parameter range and the preset abnormal parameter range. Since the preset abnormal parameter range includes abnormal parameters corresponding to noise, abnormal parameters can be eliminated when determining the current target parameter, thereby reducing noise in the VFD equipment during field weakening control and improving equipment reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating an embodiment of the frequency converter control method of this application; Figure 2This is a schematic diagram of the structure of an embodiment of the frequency converter device of this application; Figure 3 This is a schematic diagram of the structure of an embodiment of the computer storage medium of this application. Detailed Implementation

[0018] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0019] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0020] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0021] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] The variable frequency device control method of this application will be explained in detail below with reference to the accompanying drawings.

[0024] See Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the frequency converter control method of this application, specifically including: Step S11: In response to the field weakening control command, determine the field weakening control parameter range corresponding to the current state.

[0025] In one embodiment, the field weakening control command is determined based on at least one of the field weakening depth, voltage utilization rate, and motor current. In a specific embodiment, the field weakening control command is generated when the field weakening depth is too large, the voltage utilization rate is too large, or the reverse current is too large.

[0026] It should be noted that the field weakening depth is a core indicator describing the degree of field weakening and speed-enhancing operation of a motor. Its detection essentially quantifies the deviation between the motor's actual magnetic flux linkage and its rated magnetic flux linkage. The greater the direct-axis reverse current and the greater the direct-axis reverse magnetic flux linkage, the deeper the field weakening depth. A field weakening control command is generated when the detected field weakening depth exceeds a first preset value.

[0027] Voltage utilization rate is used to characterize the effective utilization of the DC bus voltage. It is the ratio of the inverter output voltage to the available design voltage (determined based on the bus voltage). In one embodiment, if the voltage utilization rate is greater than or equal to a second preset value, a field weakening control command is generated.

[0028] During field weakening control, the motor's direct-axis current becomes negative to produce a demagnetizing effect. By monitoring the direction and magnitude of the motor's direct-axis current, it can be determined whether the motor is in a field weakening state. When the direct-axis current is reversed and the reverse current is too large, it indicates that the motor has entered a field weakening state, and a field weakening control command is generated.

[0029] It should be noted that when the compressor operates at high frequency (e.g., >80 Hz), the back electromotive force approaches the limit of the usable design voltage. When the field weakening capability is insufficient, the control system will trigger frequency reduction protection, limiting the frequency to a safe range. Similarly, when the fan is operating under field weakening control, the speed will be reduced as the load increases. Therefore, the field weakening control parameters include frequency control parameters and / or speed control parameters. In one embodiment, the field weakening control parameter range is determined based on the minimum parameter required to maintain the current operating condition and the maximum parameter allowed under the current operating condition.

[0030] If the field weakening control parameter is a frequency control parameter, then in response to the field weakening control command, the field weakening control frequency range corresponding to the current state is determined. In one embodiment, the maximum allowable frequency Fmax for the current operating condition is calculated based on the available design voltage, motor parameters, and current limit corresponding to the current state, wherein the motor parameters include: permanent magnet flux linkage ψ f d-axis (direct axis) inductance L d q-axis (quadrature axis) inductance L q d-axis (direct axis) current q-axis (quadrature axis) current In one embodiment, the maximum frequency Fmax is calculated using the following formula: Formula (1).

[0031] Nmax= Formula (2).

[0032] Fmax= / 60 formula (3).

[0033] In the above formula (1), This indicates the maximum electrical angular velocity of the motor. This indicates the maximum output voltage of the frequency converter. This indicates that the voltage utilization rate is 100%. In formula (2), Nmax represents the maximum speed allowed under the current operating conditions, and p represents the number of pole pairs of the motor.

[0034] The maximum frequency Fmax is calculated using the above formula. The frequency range for field weakening control is denoted as [Fmin, Fmax]. Fmin represents the minimum frequency required to maintain the current operating condition, such as cooling or heating capacity.

[0035] If the field weakening control parameter is the same as the speed control parameter, then in response to the field weakening control command, the field weakening control speed range corresponding to the current state is determined. In one embodiment, the maximum permissible speed Nmax under the current operating condition is calculated using the above formula (2). The field weakening control speed range is denoted as [Nmin, Nmax], where Nmin represents the minimum speed required to maintain the current operating condition, such as cooling or heating capacity, without triggering a protective shutdown.

[0036] Step S12: Determine the current target parameters based on the range of weak magnetic control parameters and the preset abnormal parameter range.

[0037] The preset abnormal parameter range includes the abnormal parameters corresponding to noise.

[0038] In one embodiment, the preset abnormal parameter range includes a preset abnormal frequency range and / or a preset abnormal speed range.

[0039] In one embodiment, the current target parameter is any value within the target parameter range; the target parameter range is the range corresponding to the non-overlapping portion of the weak magnetic control parameter range and the preset abnormal parameter range.

[0040] To implement the variable frequency device control method of this application, it is necessary to predetermine a preset abnormal frequency range. Specifically, taking an air conditioner as an example, experiments are conducted in the laboratory under different operating conditions (such as heating or cooling) and at different frequencies to perform spectrum analysis, thereby determining the preset abnormal frequency range.

[0041] For example, the air conditioner is set to heating mode, and different operating conditions are defined within this mode, such as rated operating condition and overload operating condition. Different speeds of the outdoor fan and different compressor frequencies are set, including high, medium, and low fan speeds. A frequency sweep is performed within the compressor frequency range of 20-100 Hz, and noise testing is conducted within this range. Through spectrum analysis and / or human judgment, if the noise exceeds a noise threshold, the corresponding frequency point is recorded, for example, (A, T1, P1), where A represents the heating mode, T1 represents the ambient temperature in heating mode, and P1 represents the frequency of excessive noise in heating mode at temperature T1. This identifies abnormal frequency points of excessive noise in heating mode. Clustering these abnormal frequency points yields a preset abnormal frequency range for heating mode.

[0042] For example, the air conditioner is set to cooling mode, and different operating conditions are defined within this mode, such as rated operating condition and overload operating condition. Different speeds of the outdoor fan and different compressor frequencies are set, including high, medium, and low fan speeds. A frequency sweep is performed within the compressor frequency range of 20-100 Hz. Noise tests are conducted on the air conditioner within this frequency range. Through spectrum analysis and / or human judgment, if the noise exceeds a noise threshold, the corresponding frequency point is recorded, for example, (B, T2, P2). Here, B represents the operating condition as cooling mode, T2 represents the ambient temperature in cooling mode, and P2 represents the frequency at which the noise is excessive in cooling mode at temperature T2. This allows the identification of abnormal frequency points with excessive noise in cooling mode. Clustering these abnormal frequency points yields a preset abnormal frequency range for cooling mode.

[0043] It should be noted that the preset abnormal frequency ranges include noise abnormal frequency ranges and vibration abnormal frequency ranges. The noise abnormal frequency range includes frequency points where electromagnetic howling may occur, and the vibration abnormal frequency range includes frequency points where pipeline stress and pipeline vibration may occur.

[0044] Based on the operating conditions, the corresponding preset abnormal frequency ranges are stored in the frequency converter. For example, the abnormal frequency ranges corresponding to the heating mode are denoted as A: [a1, b1], [m1, n1], [x1, y1]; and the abnormal frequency ranges corresponding to the cooling mode are denoted as B: [a2, b2], [m2, n2], [x2, y2].

[0045] In the control of variable frequency equipment, in response to the field weakening control command, the current target frequency is determined based on the field weakening control frequency range and the preset abnormal frequency range; wherein, the preset abnormal frequency range includes the frequency corresponding to noise.

[0046] Through the above process, the magnetic field weakening control frequency range and the abnormal frequency range corresponding to the noise are known; the current target frequency is determined based on the magnetic field weakening control frequency range and the preset abnormal frequency range. In one embodiment, the current target frequency is any frequency within the target frequency range; the target frequency range is the interval corresponding to the non-overlapping portion of the magnetic field weakening control frequency range and the preset abnormal frequency range. Assuming the magnetic field weakening control frequency range is [30, 80], and the preset abnormal frequency ranges are [70, 72] and [50, 55], then the target frequency ranges are (30, 50), (55, 70), and (72, 80). The current target frequency is any frequency within the target frequency range, for example, it can be 40, 60, 75, etc.

[0047] The current target parameter is a value within the target parameter range that matches the current operating condition; or, the current target parameter is a value within the target parameter range that matches the noise standard. In a specific embodiment, the current target frequency is a frequency within the target frequency range that matches the current operating condition; or, the current target frequency is a frequency within the target frequency range that matches the noise standard.

[0048] In one embodiment, the current target frequency is a frequency within the target frequency range that matches the current operating condition. For example, the current target frequency is close to or equal to the maximum frequency Fmax allowed under the current operating condition. It can be understood that the maximum frequency Fmax allowed under the current operating condition is the optimal frequency matching the current operating condition. If the maximum frequency Fmax allowed under the current operating condition is within the target frequency range, then the current target frequency is equal to the maximum frequency Fmax allowed under the current operating condition; if the maximum frequency Fmax allowed under the current operating condition is not within the target frequency range, then the current target frequency is the frequency closest to the maximum frequency Fmax allowed under the current operating condition. This ensures the performance of the device.

[0049] In another embodiment, the current target frequency is the frequency within the target frequency range that matches a noise standard. Specifically, the current target frequency is the frequency with the lowest noise level within the target frequency range, which can reduce device noise and improve comfort.

[0050] In one embodiment, in response to the target frequency range being empty, the variable frequency device control method further includes: adjusting the opening of the electronic expansion valve and / or the speed of the fan. It is understood that if the calculated field weakening control frequency range is the same as the preset abnormal frequency range, then the target frequency range is empty, and there is no selectable frequency. In this case, the system load can be reduced, for example, by adjusting the opening of the electronic expansion valve and / or the speed of the fan, so that the compressor returns to the frequency it had when it first entered the field weakening state. Specifically, to reduce the system load, the opening of the electronic expansion valve and / or the speed of the fan can be increased. If increasing the fan speed is limited, only the opening of the electronic expansion valve can be adjusted.

[0051] In another embodiment, to implement the variable frequency device control method of this application, it is necessary to predetermine a preset abnormal speed range. Specifically, taking an air conditioner as an example, experiments are conducted in the laboratory under different operating conditions (such as heating or cooling) and different speeds, and spectrum analysis is performed to determine the preset abnormal speed range.

[0052] For example, the air conditioner is set to heating mode, and different operating conditions are defined within this mode, such as rated operating condition and overload operating condition. Different fan speeds and compressor frequencies are set, along with high, medium, and low fan speeds, corresponding to compressor frequencies of 20-100Hz and fan speeds of 400-1200rpm. Noise levels are tested within this speed range. Through spectrum analysis and / or human judgment, if the noise exceeds a noise threshold, the corresponding speed point is recorded, for example, (A, T3, P3). Here, A represents the heating mode, T3 represents the ambient temperature during heating mode, and P3 represents the speed at which the noise is excessive during heating mode at temperature T3. This identifies abnormal speed points with excessive noise during heating mode. Clustering these abnormal speed points allows for the determination of preset abnormal speed ranges within the heating mode.

[0053] For example, the air conditioner is set to cooling mode, and different operating conditions are defined within this mode, such as rated operating condition and overload operating condition. Different fan speeds and compressor frequencies are set, with high, medium, and low fan speeds corresponding to compressor frequencies of 20-100Hz and fan speeds of 400-1200rpm. Noise levels are tested within this speed range. Through spectrum analysis and / or human judgment, if the noise exceeds a noise threshold, the corresponding speed point is recorded, for example, (B, T4, P4). Here, B represents the cooling mode, T4 represents the ambient temperature in cooling mode, and P4 represents the speed at which the noise is excessive in cooling mode at temperature T4. This allows us to identify abnormal speed points with excessive noise in cooling mode. Clustering these abnormal speed points reveals the preset abnormal speed range in cooling mode.

[0054] It should be noted that the preset abnormal speed range includes the resonance speed range (e.g., 980–1020 rpm) and the aerodynamic noise speed range (e.g., 1160–1200 rpm). The resonance speed range includes the speed points where resonance will occur, resulting in excessive noise.

[0055] Based on the operating conditions, the corresponding preset abnormal speed ranges are stored in the frequency converter. For example, the abnormal speed ranges corresponding to the heating mode are recorded as A: [A1, B1], [M1, N1], [X1, Y1]; and the abnormal speed ranges corresponding to the cooling mode are recorded as B: [A2, B2], [M2, N2], [Y2, Y2].

[0056] In variable frequency drive (VFD) equipment control, in response to field weakening control commands, the current target speed is determined based on the field weakening control speed range and the preset abnormal speed range.

[0057] Through the above process, the field weakening control speed range and the abnormal speed range corresponding to the noise are known; the current target speed is determined based on the field weakening control speed range and the preset abnormal speed range. In one embodiment, the current target speed is any speed within the target speed range; the target speed range is the interval corresponding to the non-overlapping portion of the field weakening control speed range and the preset abnormal speed range. Assuming the field weakening control speed range is [400, 1000], and the preset abnormal speed range is [980, 1020] and [1160, 1200], then the target speed range is [400, 980] and (1020, 1160). The current target speed is any value within the target speed range, for example, it can be 500, 1110, etc.

[0058] In one specific embodiment, the current target speed is the speed within the target speed range that matches the current operating condition; or, the current target speed is the speed within the target speed range that matches the noise standard.

[0059] In one embodiment, the current target speed is the speed within the target speed range that matches the current operating condition. For example, the current target speed is close to or equal to the maximum speed Nmax allowed under the current operating condition. It can be understood that the maximum speed Nmax allowed under the current operating condition is the optimal speed matching the current operating condition. If the maximum speed Nmax allowed under the current operating condition is within the target speed range, then the current target speed is equal to the maximum speed Nmax allowed under the current operating condition; if the maximum speed Nmax allowed under the current operating condition is not within the target speed range, then the current target speed is the speed closest to the maximum speed Nmax allowed under the current operating condition. This ensures the performance of the equipment.

[0060] In another embodiment, the current target speed is the speed within the target speed range that matches the noise standard. Specifically, the current target speed is the speed with the lowest noise level within the target speed range, which can reduce equipment noise and improve comfort.

[0061] In one embodiment, in response to the target speed range being empty, the variable frequency drive control method further includes adjusting the opening of the electronic expansion valve. It is understood that if the calculated field weakening control speed range is the same as the preset abnormal speed range, then the target speed range is empty, and there is no selectable speed. In this case, the system load can be reduced, for example, by adjusting the opening of the electronic expansion valve to reduce the speed, allowing the compressor to return to the speed it had when it first entered the field weakening state, thus ensuring normal system operation. Specifically, to reduce the system load, the opening of the electronic expansion valve can be increased.

[0062] The variable frequency equipment control method of this application effectively suppresses high-frequency howling and structural resonance, significantly improving acoustic and vibration comfort. By establishing a multi-dimensional abnormal frequency / speed database covering the compressor and fan, and actively avoiding these abnormal frequencies and speeds during the frequency / speed reduction process of magnetic field weakening, abnormal noise and vibration caused by frequencies falling into the electromagnetic howling frequency band (such as 72–76Hz) or mechanical resonance zone (such as 46–50Hz, 980–1020rpm) are fundamentally avoided.

[0063] Step S13: Control the frequency converter based on the current target parameters.

[0064] It should be noted that if the field weakening depth is too large, the voltage utilization rate is too high, or the reverse current of the motor's direct shaft current is too large, then it indicates that frequency and speed reduction are necessary. After determining the current target frequency, the historical frequency is reduced to the current target frequency, and the compressor of the variable frequency drive is controlled using the current target frequency; and / or, after determining the current target speed, the historical speed is reduced to the current target speed, and the fan of the variable frequency drive is controlled using the current target speed.

[0065] In one embodiment, historical parameters are adjusted based on preset parameters to obtain the current target parameters, which are then used to control the inverter equipment. The historical parameters can be the target frequency or target speed corresponding to the previous time period, or the actual frequency or actual speed corresponding to the previous time period. The target frequency corresponding to the previous time period is reduced according to preset parameters, such as a frequency reduction parameter, to obtain the current target frequency, which is then used to control the compressor of the inverter equipment. Similarly, the target speed corresponding to the previous time period is reduced according to preset parameters, such as a speed reduction parameter, to obtain the current target speed, which is then used to control the fan of the inverter equipment.

[0066] It should be noted that in variable frequency drive (VFD) equipment control, noise frequencies can be avoided by adjusting only the compressor frequency, or noise speeds can be avoided by adjusting only the fan speed. In a preferred embodiment of this application, noise frequencies can be avoided simultaneously when adjusting the compressor frequency and noise speeds when adjusting the fan speed, thus achieving coordinated acoustic and vibration control of the compressor and fan. In the prior art, the compressor and fan controls are independent, failing to coordinate the overall acoustic and vibration performance of the machine. This application unifies the modeling, joint querying, and coordinated scheduling of abnormal data from both. For example, when the compressor needs to be downgraded to 70Hz, the outdoor fan speed is simultaneously adjusted to avoid its 1000rpm resonance point, achieving whole-machine-level acoustic and vibration coupling optimization and avoiding the disconnect between a quiet compressor and a noisy fan.

[0067] The variable frequency equipment control method of this application avoids the contradiction of "solving the electrical control problem but causing noise and vibration problems" after frequency and speed reduction due to field weakening; at the same time, it improves quietness and mechanical reliability; the control logic is implemented purely in software and is compatible with existing variable frequency drive platforms; and the sound and vibration characteristics of the compressor and fan are uniformly scheduled to adapt to different installation environments and aging conditions.

[0068] The variable frequency drive control method of this application achieves intelligent frequency optimization under weak magnetic field conditions, balancing performance and reliability. Traditional solutions often use fixed-slope frequency reduction or direct frequency limiting after weak magnetic field triggering, which can easily lead to secondary impacts. This application, based on real-time calculated maximum frequency Fmax and maximum speed Nmax, intelligently selects the optimal target frequency / speed within the feasible domain: prioritizing cooling / heating capacity (performance priority) while also supporting switching to historical low-noise points (comfort priority), maximizing system availability under voltage-constrained conditions.

[0069] The variable frequency device control method proposed in this application has strong compatibility and is applicable to various types of variable frequency air conditioning products. This solution does not rely on a specific motor structure and is applicable to integrated (IPMSM) compressors, as well as various fan types such as cross-flow, axial flow, and centrifugal. Only the corresponding motor parameters and abnormal test frequencies need to be entered to deploy it on product platforms such as household split-type air conditioners, multi-split air conditioners, and heat pump water heaters, demonstrating significant engineering and promotional value.

[0070] Please see Figure 2 , Figure 2 This is a schematic diagram of a frame of an embodiment of the frequency converter device provided in this application. The frequency converter device 80 includes a memory 81 and a processor 82 coupled to each other. The processor 82 is used to execute program instructions stored in the memory 81 to implement the steps of any of the compressor frequency control method embodiments described above. In a specific implementation scenario, the frequency converter device 80 may include, but is not limited to, a microcomputer or a server. In addition, the frequency converter device 80 may also include mobile devices such as laptops and tablets, which are not limited here.

[0071] Specifically, processor 82 controls itself and memory 81 to implement the steps of any of the compressor frequency control method embodiments described above. Processor 82 can also be referred to as a CPU (Central Processing Unit). Processor 82 may be an integrated circuit chip with signal processing capabilities. Processor 82 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor can be a microprocessor or any conventional processor. Furthermore, processor 82 can be implemented using integrated circuit chips.

[0072] Please see Figure 3 , Figure 3 This is a schematic diagram of a framework of an embodiment of the computer-readable storage medium provided in this application. The computer-readable storage medium 90 stores program instructions 901 that can be executed by a processor. The program instructions 901 are used to implement the steps of any of the above-described embodiments of the compressor frequency control method.

[0073] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0074] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0076] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0077] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A variable frequency device control method, characterized by, The method comprises: In response to a field-weakening control instruction, determining a field-weakening control parameter interval of a field-weakening control parameter corresponding to a current state; Determining a current target parameter based on the field-weakening control parameter interval and a preset abnormal parameter interval; The preset abnormal parameter interval includes an abnormal parameter corresponding to noise; Controlling the variable frequency device based on the current target parameter.

2. The variable frequency equipment control method of claim 1, wherein The field-weakening control parameter includes a frequency control parameter and / or a rotating speed control parameter.

3. The variable frequency equipment control method of claim 1, wherein The field-weakening control instruction is determined based on at least one of a field-weakening depth, a voltage utilization rate, and a motor current.

4. The variable frequency device control method of claim 1, wherein The current target parameter is an arbitrary value in a target parameter interval; and the target parameter interval is an interval corresponding to a non-overlapping part of the field-weakening control parameter interval and the preset abnormal parameter interval.

5. The variable frequency device control method of claim 4, wherein, The current target parameter is a value in the target parameter interval matching a current working condition; or the current target parameter is a value in the target parameter interval matching a noise standard.

6. The variable frequency equipment control method of claim 4, wherein, In response to the target parameter interval being empty, the variable frequency device control method further comprises: Adjusting an electronic expansion valve opening degree and / or a rotating speed of a fan.

7. The variable frequency equipment control method of claim 1, wherein Controlling the variable frequency device based on the current target parameter includes: Adjusting a historical parameter based on a preset parameter to obtain the current target parameter, and controlling the variable frequency device using the current target parameter.

8. The variable frequency equipment control method of claim 1, wherein, The field-weakening control parameter interval is determined based on a minimum parameter for maintaining a current working condition and a maximum parameter allowed by the current working condition.

9. A frequency conversion device, comprising: The variable frequency device comprises a memory and a processor coupled to each other, the processor is configured to execute program instructions stored in the memory, and the processor is configured to execute program data to implement the variable frequency device control method of any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer readable storage medium, and the computer program is executed by the processor to implement the variable frequency device control method of any one of claims 1-8.

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