Compressor control method and device, equipment and storage medium

Abstract

The invention relates to a compressor control method and device, equipment and a storage medium, and the method comprises the steps that under the condition that a compressor rotor does not rotate, a high-frequency voltage signal is injected into a compressor according to a preset frequency, and the positive-sequence current and the negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor are extracted; determining a first inductance parameter and a second inductance parameter of the compressor through the preset frequency, the high-frequency signal, the positive sequence current and the negative sequence current; a corresponding capacitance value is matched from a database based on the first inductance parameter and the second inductance parameter, and the position of the compressor rotor is determined based on the negative sequence current and a preset phase-locked loop formula; and inputting the capacitance value and the position of the rotor of the compressor into a controller of the compressor to adjust the resonant frequency so as to control the operation of the compressor. Through the method and the device, the problem of low efficiency of the compressor in the operation process due to factory setting of the resonant capacitor in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of compressor control, and in particular to a compressor control method, device, equipment and storage medium. Background Art

[0002] Compressors often face the technical challenge of cold-start difficulties during startup, especially in low-temperature environments. The high viscosity of refrigeration oil can easily cause wear on internal compressor components, increasing startup difficulty and impacting the compressor's lifespan and performance. Existing technology prevents all compressors from matching resonant capacitors to a specific frequency that neither affects rotor rotation nor generates noise. Currently, all compressors ship with factory-preset capacitors, resulting in a fixed resonant frequency and low compressor efficiency.

[0003] There is currently no effective solution to the above technical problems in the prior art. Summary of the Invention

[0004] The present application provides a control method, device, equipment and storage medium for a compressor to solve the problem in the prior art that the factory-set resonant capacitor causes the compressor to have low efficiency during operation.

[0005] In the first aspect, the present application provides a method for controlling a compressor, comprising: when the compressor rotor is not rotating, injecting a high-frequency voltage signal into the compressor at a preset frequency, and extracting the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor; determining the first inductance parameter and the second inductance parameter of the compressor by the preset frequency, the high-frequency signal, the positive-sequence current and the negative-sequence current, wherein the first inductance parameter represents the d-axis inductance parameter of the compressor, and the second inductance parameter represents the q-axis inductance parameter of the compressor; matching the corresponding capacitance value from a database based on the first inductance parameter and the second inductance parameter, and determining the compressor rotor position based on the negative-sequence current and a preset phase-locked loop formula; inputting the capacitance value and the compressor rotor position into the controller of the compressor to adjust the resonant frequency to control the operation of the compressor.

[0006] Optionally, determining the first inductance parameter and the second inductance parameter of the compressor by using the preset frequency, the high-frequency signal, the positive-sequence current and the negative-sequence current includes: determining the sum of the positive-sequence current and the negative-sequence current, multiplying the sum by the preset frequency to obtain a first product result, and determining the ratio of the high-frequency signal to the first product result as the first inductance parameter; determining the difference between the positive-sequence current and the negative-sequence current, multiplying the difference by the preset frequency to obtain a second product result, and determining the ratio of the high-frequency signal to the second product result as the second inductance parameter.

[0007] Optionally, determining the compressor rotor position based on the negative sequence current and a preset phase-locked loop formula includes: presetting the formula in the phase-locked loop to the following form: y=(k i1 s a +k d s b )(k p +k i2 s c )x; where k i1 , k d , k p , k i2 is a coefficient greater than zero, a and c are coefficients less than 0, b is a coefficient greater than 0, s is a differential operator, x is the negative sequence current, and y is the rotor position; by adjusting the values ​​of a and b, the low-pass filter in the phase-locked loop is converted into a band-pass filter to determine the rotor position.

[0008] Optionally, adjusting the values ​​of a and b to convert the low-pass filter in the phase-locked loop into a band-pass filter to determine the rotor position includes: setting the value of a to a value between -1 and 0, and setting the value of b to not equal to 0, to convert the low-pass filter in the phase-locked loop into a band-pass filter; and determining the rotor position based on the phase-locked loop after setting the values ​​of a and b.

[0009] Optionally, the capacitance value and the compressor rotor position are input into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor, including: adjusting the switch in the matching capacitance circuit in the compressor so that the capacitance value in the matching capacitance circuit matches the capacitance value, wherein the matching capacitance circuit is composed of multiple parallel circuits, and each branch is composed of one or more capacitors and switches in series; preheating the compressor through a resonant circuit formed by the matching capacitance circuit and the coil of the compressor; controlling the compressor based on the rotor position input into the controller and the resonant frequency determined by the capacitance value and inductance parameters; wherein the inductance parameters include the first inductance parameter and the second inductance parameter.

[0010] Optionally, adjusting the switches in the matching capacitor circuit in the compressor so that the capacitance value in the matching capacitor circuit matches the capacitance value includes: determining the number of capacitors required to be turned on in the matching capacitor circuit based on the capacitance value; determining the number of switches required to be turned on based on the number of capacitors; and controlling the on and off of the switches in the matching capacitor circuit based on the number of switches required to be turned on.

[0011] Optionally, the compressor is controlled based on the rotor position input into the controller and the resonant frequency determined by the capacitance value and the inductance parameters, including: determining the resonant frequency fopt of the compressor by the following formula: fopt = 1 / 2πL×C; wherein L is the inductance value of the compressor coil, and C is the capacitance value; and controlling the operation of the compressor based on the determined resonant frequency and the rotor position.

[0012] In second aspect, the present application provides a control device for a compressor, comprising: a first processing module, for injecting a high-frequency voltage signal into the compressor at a preset frequency when the compressor rotor is not rotating, and extracting the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor; a second processing module, for determining the first inductance parameter and the second inductance parameter of the compressor through the preset frequency, the high-frequency signal, the positive-sequence current and the negative-sequence current, wherein the first inductance parameter represents the d-axis inductance parameter of the compressor, and the second inductance parameter represents the q-axis inductance parameter of the compressor; a third processing module, for matching the corresponding capacitance value from the database based on the first inductance parameter and the second inductance parameter, and determining the compressor rotor position based on the negative-sequence current and a preset phase-locked loop formula; a control module, for inputting the capacitance value and the compressor rotor position into the controller of the compressor to adjust the resonant frequency to control the operation of the compressor.

[0013] In a third aspect, the present application provides a device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to execute the compressor control method described in the first aspect of the present application.

[0014] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the compressor control method described in the first aspect of the present application.

[0015] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application, when the compressor rotor is not rotating, injects a high-frequency voltage signal into the compressor according to a preset frequency, and extracts the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor, thereby determining the first inductance parameter and the second inductance parameter of the compressor by the preset frequency, the high-frequency signal, the positive-sequence current and the negative-sequence current; and, based on the first inductance parameter and the second inductance parameter, matching the corresponding capacitance value from the database, and determining the compressor rotor position based on the negative-sequence current and the preset phase-locked loop formula, and finally inputting the capacitance value and the compressor rotor position into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor. It can be seen that in the embodiment of the present application, after first determining the compressor inductance parameter, the corresponding capacitance value can be matched from the database, rather than setting the corresponding capacitance value at the factory, so as to ensure that the resonant frequency determined according to the inductance and the matching capacitance value enables the compressor to operate in a better state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A flowchart of a compressor control method provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a matching capacitor circuit provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the system structure used by the compressor in the present application provided in the embodiment of the present application;

[0022] Figure 4 A flow chart of an adaptive full compressor winding heating resonance control method provided in an embodiment of the present application;

[0023] Figure 5A schematic diagram of a phase-locked loop provided in an embodiment of the present application;

[0024] Figure 6 A schematic structural diagram of a control device for a compressor provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of the device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0028] In order to solve the problem in the prior art that the resonant capacitor is set at the factory, which leads to low efficiency of the compressor during operation, the present application provides a method for controlling a compressor. The compressor in the embodiment of the present application can be applied to various devices that require a compressor, such as air conditioners, refrigerators, etc., and the device includes an inverter, a matching capacitor circuit, a switch, a controller, and a compressor. The switch is used to control whether the capacitor in the matching capacitor circuit is turned on or off, so that the required capacitance value can be adjusted according to demand; the controller is used to control the operation of the compressor. The inverter is used to convert the fixed frequency current provided by the power supply into a variable frequency output voltage, and transmit the voltage to the power supply circuit of the compressor. Capacitors are connected in series between the phase voltage output end of the inverter and the port of the compressor. These capacitors are used to form an LC resonant circuit, thereby generating heat through electromagnetic induction to heat the compressor. The capacitor is a key component for realizing resonant control. It controls the resonant frequency and generates heat by forming an LC resonant circuit with the compressor coil. The switch is used to control the connection and disconnection of the capacitor, and the controller realizes dynamic frequency modulation and capacitor matching through the state of the switch. Based on this, Figure 1 As shown, the steps of the method include:

[0029] Step 101: When the compressor rotor is not rotating, inject a high-frequency voltage signal into the compressor at a preset frequency, and extract the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor;

[0030] In the embodiment of the present application, the fact that the compressor rotor does not rotate is not caused by a compressor failure, but rather that the injected preset frequency cannot drive the compressor rotor to rotate, thereby ensuring the accuracy of the subsequent determination of the initial rotor position. In addition, the positive-sequence current refers to the current component of the three-phase current distributed in the positive phase sequence (phase A leads phase B by 120 degrees, phase B leads phase C by 120 degrees, and phase C leads phase A by 120 degrees), which is the dominant current during normal operation. The negative-sequence current refers to the current component of the three-phase current distributed in the negative phase sequence (phase A lags phase B by 120 degrees, phase B lags phase C by 120 degrees, and phase C lags phase A by 120 degrees).

[0031] Step 102: determining a first inductance parameter and a second inductance parameter of the compressor by using a preset frequency, a high-frequency signal, a positive-sequence current, and a negative-sequence current, wherein the first inductance parameter represents a d-axis inductance parameter of the compressor, and the second inductance parameter represents a q-axis inductance parameter of the compressor;

[0032] It can be seen that in the embodiment of the present application, the inductance parameters of the d-axis and q-axis of the compressor can be determined based on the preset frequency and high-frequency signal as well as the positive-sequence current and negative-sequence current, so that the matching capacitance can be determined based on the inductance parameters to optimize the resonant frequency of the compressor and achieve the purpose of improving the operating efficiency of the compressor.

[0033] Step 103: Matching a corresponding capacitance value from a database based on the first inductance parameter and the second inductance parameter, and determining the compressor rotor position based on the negative sequence current and a preset phase-locked loop formula;

[0034] In the embodiment of the present application, a database stores mappings between different inductances and corresponding capacitances. Based on these mappings, the appropriate capacitance can be determined based on the inductance, thereby achieving the optimal resonant frequency and thus optimizing the compressor's operating state. This demonstrates that, compared to conventional methods, the compressor control method of the embodiment of the present application achieves higher operating efficiency.

[0035] Shaft 104 inputs the capacitance value and the compressor rotor position into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor.

[0036] Through the above steps 101 to 104, when the compressor rotor is not rotating, a high-frequency voltage signal is injected into the compressor according to a preset frequency, and the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor are extracted, and then the first inductance parameter and the second inductance parameter of the compressor are determined by the preset frequency, the high-frequency signal, the positive-sequence current and the negative-sequence current; and, based on the first inductance parameter and the second inductance parameter, the corresponding capacitance value is matched from the database, and the compressor rotor position is determined based on the negative-sequence current and the preset phase-locked loop formula, and finally the capacitance value and the compressor rotor position are input into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor. It can be seen that in the embodiment of the present application, the corresponding capacitance value can be matched from the database after determining the compressor inductance parameter first, instead of setting the corresponding capacitance value at the factory, so as to ensure that the resonant frequency determined according to the inductance and the matching capacitance value enables the compressor to operate in a better state.

[0037] In the embodiment of the present application, the method of determining the first inductance parameter and the second inductance parameter of the compressor by using the preset frequency, the high-frequency signal, the positive-sequence current, and the negative-sequence current involved in the above step 102 may further include:

[0038] Step 11: determining a sum of the positive-sequence current and the negative-sequence current, multiplying the sum by a preset frequency to obtain a first product result, and determining a ratio of the high-frequency signal to the first product result as a first inductance parameter;

[0039] Step 12: Determine the difference between the positive sequence current and the negative sequence current, multiply the difference by a preset frequency to obtain a second product result, and determine the ratio of the high frequency signal to the second product result as the second inductance parameter.

[0040] It can be seen that in the embodiment of the present application, according to a certain preset frequency (to ensure that the compressor rotor does not rotate) ω h Inject a high-frequency voltage signal U into the compressor h , then extract the positive sequence current I cp and negative sequence current I cn Finally, the corresponding inductance L is determined by the following formula d (first inductor), L q (Second inductor):

[0041]

[0042] It can be seen that the meanings expressed in the above steps 11 to 12 can be expressed by the above formula (1).

[0043] As can be seen, in the embodiments of the present application, the inductance of the compressor can be determined when it is not running, that is, the inductance of the compressor can be determined offline, so that the matching capacitance can be determined based on the inductance. Therefore, a relatively suitable inductance and capacitance can be determined when the compressor is not running to obtain the optimal resonant frequency, thereby ensuring high efficiency and stable operation after the compressor is running.

[0044] In an optional implementation manner of the embodiment of the present application, the method of determining the compressor rotor position based on the negative sequence current and the preset phase-locked loop formula involved in the above step 103 may further include:

[0045] Step 21: Preset the formula in the phase-locked loop to the following form:

[0046] y=(k i1 s a +k d s b )(k p +k i2 s c )x (2)

[0047] Among them, k i1 , k d , k p , k i2 is a coefficient greater than zero, a and c are coefficients less than 0, b is a coefficient greater than 0, s is the differential operator, x is the negative sequence current, and y is the rotor position;

[0048] Step 22 adjusts the values ​​of a and b to convert the low-pass filter in the phase-locked loop into a band-pass filter to determine the rotor position.

[0049] In a specific example, k in the above formula (2) i1 , k d , k p , k i2 These are coefficients that can be adjusted as needed.

[0050] Furthermore, the method of adjusting the values ​​of a and b involved in step 22 to convert the low-pass filter in the phase-locked loop into a band-pass filter to determine the rotor position includes:

[0051] Step 31, setting the value of a to a value between -1 and 0, and setting the value of b to not equal to 0, so as to convert the low-pass filter in the phase-locked loop into a band-pass filter;

[0052] Step 32: Determine the rotor position based on the phase-locked loop after setting the values ​​of a and b.

[0053] It can be seen that the two terms a and b in the above formula (2) are similar to the inductor and capacitor in parallel. Different values ​​of a and b are similar to adjusting the inductor and capacitor in the filter circuit. Setting b to 0 is equivalent to only including capacitors in the circuit, which can be regarded as a low-pass filter. Assigning any value between -1 and 0 to a is equivalent to adjusting the capacitance value, which is also equivalent to adjusting the filter coefficient of the low-pass filter. Similarly, when b≠0, it can be regarded as a band-pass filter. Adjusting a and b is equivalent to adjusting its band-pass filter coefficient. It can be seen that the indefinite order calculus design of the phase-locked loop in the embodiment of the present application can not only make the traditional phase-locked loop LF (loop filter) have only low-pass filtering function by adjusting the order of a and b, thereby failing to meet current needs, but also adjust the phase-locked loop design in the embodiment of the present application into a band-pass filter directly for position identification and inductance identification by adjusting the value of a and b. It can also improve the control performance of the phase-locked loop when inputting high-frequency voltages of different frequencies by adjusting the order c.

[0054] In an optional implementation manner of the embodiment of the present application, the method of inputting the capacitance value and the compressor rotor position into the controller of the compressor to control the compressor involved in the above step 104 may further include:

[0055] Step 41, adjusting a switch in a matching capacitor circuit in the compressor so that the capacitance value in the matching capacitor circuit matches the capacitance value, wherein the matching capacitor circuit is composed of multiple parallel circuits, each branch of which is composed of one or more capacitors and switches connected in series;

[0056] In this regard, in the embodiment of the present application, the above step 41 can be implemented as follows: determine the number of capacitors required to be turned on in the matching capacitor circuit based on the capacitance value; determine the number of switches required to be turned on based on the number of capacitors; and control the on and off of the switches in the matching capacitor circuit based on the number of switches required to be turned on. In this regard, in a specific example, Figure 2 The matching capacitor circuit shown in the figure consists of five branches in parallel. From top to bottom, each branch includes a switch, and except for the top branch which has no capacitor, the others all have capacitors. The capacity of each capacitor can be equal or unequal. Specifically, the required capacitance value can be determined by whether the switch is turned on or not. Taking the current equal capacitance values ​​as an example, and only one capacitor is needed, the switch of the second branch from top to bottom can be turned on, and all other switches are not turned on, so that the required capacitance value can be connected to the circuit. The above is just an example, and different situations can be set accordingly according to actual needs.

[0057] Step 42, preheating the compressor by matching a resonant circuit formed by a capacitor circuit and a coil of the compressor;

[0058] Step 43 : Controlling the compressor based on the rotor position input to the controller and a resonant frequency determined by capacitance and inductance parameters, wherein the inductance parameters include a first inductance parameter and a second inductance parameter.

[0059] In this regard, in order to improve the starting efficiency of the compressor, the prior art usually uses an electric heater or other preheating device to preheat the compressor. However, these methods have problems such as high energy consumption and slow heating speed, and it is difficult to meet the requirements for fast startup. In the embodiment of the present application, the required capacitance can be determined by the inductance, and then preheating is performed through the resonant circuit composed of the capacitor and the compressor coil, which can quickly reduce the viscosity of the refrigeration oil and thus improve the starting efficiency of the compressor. Compared with the traditional electric heating preheating method, in the embodiment of the present application, after finding the capacitor that matches the inductance, the resonant frequency is optimized, so that the preheating method can have the effects of low energy consumption and fast heating speed, thereby solving the problem of high energy consumption and slow heating speed of the existing heating by electric heaters or other preheating devices.

[0060] Based on this, in an optional implementation of the embodiment of the present application, the method involved in step 43 of inputting the compressor rotor position into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor may further include:

[0061] Step 51: Determine the resonant frequency fopt of the compressor using the following formula:

[0062] fopt=1 / 2πL×C

[0063] Where, L is the inductance of the compressor coil, and C is the capacitance;

[0064] In step 52 , the operation of the compressor is controlled based on the determined resonant frequency and the rotor position.

[0065] It can be seen that in the embodiment of the present application, the LC resonant circuit is composed of a compressor coil and a capacitor, and efficient heating of the compressor is achieved through the resonant circuit. When the LC resonant circuit operates at a specific frequency, it generates heat through electromagnetic induction, which is used to heat the refrigeration oil of the compressor. This is especially important before the compressor starts, as it helps reduce wear and increase the life of the compressor. In addition, LC resonance has the additional benefits of improving energy efficiency and reducing noise, because by precisely controlling the resonant frequency (i.e., finding a capacitor that matches the compressor inductance parameters), the system can operate under optimal conditions, thereby reducing energy consumption and optimizing overall performance.

[0066] The present application is explained below in conjunction with the specific implementation of the embodiment of the present application. The specific implementation provides an adaptive full compressor winding heating resonance control method, such as Figure 3As shown, the system used in the compressor in this application includes: a frequency converter, a matching capacitor, a switch, a controller, and a compressor. It is intended to ensure that the compressor operates in the best state by dynamically adjusting the frequency and capacitor matching, especially through the efficient heating function of the resonant circuit to achieve rapid startup and efficient operation of the compressor. The frequency converter is used to convert the fixed-frequency current provided by the power supply into a variable-frequency output voltage, and transmit the voltage to the power supply circuit of the compressor. Capacitors are connected in series between the phase voltage output end of the frequency converter and the port of the compressor. These capacitors are used to form an LC resonant circuit, thereby generating heat through electromagnetic induction and heating the compressor. The capacitor is a key component for achieving resonant control. By forming an LC resonant circuit with the compressor coil, the resonant frequency is controlled and heat is generated. The switch is used to control the connection and disconnection of the capacitor, and the controller realizes dynamic frequency modulation and capacitor matching through the state of the switch.

[0067] Based on this, the method steps in this specific embodiment are as follows: Figure 4 Said, including:

[0068] Step 401, offline parameter identification;

[0069] To this end, the amplitude of the positive and negative phase sequence high-frequency current components of the high-frequency response current is extracted to identify the inductance: 1) At a certain frequency (to ensure that the compressor rotor does not rotate) ω h Inject a high-frequency voltage signal U into the compressor h .

[0070] Step 402, identifying the inductance;

[0071] The inductance parameters are identified by combining the parameters in 401 above with formula (1);

[0072] Step 403, identifying the initial angular position;

[0073] First, the negative sequence current that passes through the synchronous shaft high-pass filter is used as the phase-locked loop (PLL) of the embodiment of the present application (such as Figure 5 As shown in the input, the indeterminate order calculus phase-locked loop formula in the embodiment of the present application is the above formula (2). Compared with the traditional phase-locked loop LF (loop filter) link which has only low-pass filtering function, for this application scenario, only low-pass filtering function is obviously not enough and increases the amount of calculation. The indeterminate order calculus design of the phase-locked loop in the embodiment of the present application can not only adjust the low-pass filtering function design in the LF link into a band-pass filter directly for position identification and inductance identification by adjusting the order a and b, but also improve the control performance of the phase-locked loop when high-frequency voltages of different frequencies are input by adjusting the order c.

[0074] An offline identification method collects inductance values, identifies compressor parameters, and optimizes hardware configuration based on the identification results, ensuring the optimal resonant frequency. This technology enables the system to adjust hardware based on the actual parameters of different compressors, significantly improving compressor efficiency without requiring custom hardware configuration for each model.

[0075] Step 404, calculating the matching capacitance;

[0076] To this end, the measured inductance value is matched against a pre-stored database containing typical capacitance matching values ​​for different inductance ranges. Based on this, the compressor can be preheated using an LC resonant circuit to quickly reduce the viscosity of the refrigeration oil, thereby improving compressor startup efficiency. Compared to traditional electric preheating methods, the LC resonant circuit preheating method offers the advantages of low energy consumption and rapid heating, more effectively solving the problem of compressor cold starts.

[0077] Step 405: Complete capacitance matching and hardware actuation switch;

[0078] Combined with the above Figure 2 The conduction of the switch in the matching capacitor circuit is controlled to determine the capacitance value.

[0079] Step 406: inject a resonant frequency voltage into the same angle as the initial position angle.

[0080] It can be seen that in the embodiments of the present application, by selecting the corresponding hardware configuration (action switch tube matching capacitor C, current injection angle position and initial control parameters), and writing these configurations into the controller for subsequent operations, the system can be dynamically adjusted according to the actual parameters of different compressors, thereby improving the working efficiency of the compressor. Compared with the existing method of designing hardware separately for each model, the embodiments of the present application greatly simplify the design complexity of the system, reduce manufacturing and maintenance costs, and improve the compatibility and flexibility of the system.

[0081] Furthermore, this application combines an LC resonant circuit, offline identification, and a position identification algorithm to form an integrated adaptive compressor resonance control system. This system can optimize the operating conditions of the compressor during the startup phase while maintaining the stability of the resonant frequency during operation. Through adaptive control logic, the system can automatically respond to different environmental and load conditions, ensuring that the compressor can operate efficiently and stably under various operating conditions. The control method in the embodiments of this application not only improves the startup performance of the compressor, but also enhances the overall adaptability and reliability of the system.

[0082] Corresponding to the above Figure 1 , the embodiment of the present application provides a control device for a compressor, such as Figure 6As shown, the device includes:

[0083] The first processing module 602 is configured to inject a high-frequency voltage signal into the compressor at a preset frequency when the compressor rotor is not rotating, and extract the positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor;

[0084] A second processing module 604 is configured to determine a first inductance parameter and a second inductance parameter of the compressor based on the preset frequency, the high-frequency signal, the positive-sequence current, and the negative-sequence current, wherein the first inductance parameter represents a d-axis inductance parameter of the compressor, and the second inductance parameter represents a q-axis inductance parameter of the compressor;

[0085] A third processing module 606 is configured to match a corresponding capacitance value from a database based on the first inductance parameter and the second inductance parameter, and determine a compressor rotor position based on the negative sequence current and a preset phase-locked loop formula;

[0086] The control module 608 is configured to input the capacitance value and the compressor rotor position into a controller of the compressor to adjust the resonant frequency and thereby control the operation of the compressor.

[0087] In an optional implementation manner of an embodiment of the present application, the second processing module in the embodiment of the present application includes: a first processing unit, used to determine the sum of the positive-sequence current and the negative-sequence current, multiply the sum by a preset frequency to obtain a first product result, and determine the ratio of the high-frequency signal to the first product result as a first inductance parameter; a second processing unit, used to determine the difference after subtracting the positive-sequence current from the negative-sequence current, multiply the difference by a preset frequency to obtain a second product result, and determine the ratio of the high-frequency signal to the second product result as a second inductance parameter.

[0088] In an optional implementation manner of the embodiment of the present application, the third processing module in the embodiment of the present application includes: a third processing unit, configured to preset the formula in the phase-locked loop to the following form: y=(k i1 s a +k d s b )(k p +k i2 s c )x; where k i1 , k d , k p , k i2 is a coefficient greater than zero, a and c are coefficients less than 0, b is a coefficient greater than 0, s is a differential operator, x is the negative sequence current, and y is the rotor position; the fourth processing unit is used to adjust the values ​​of a and b to convert the low-pass filter in the phase-locked loop into a band-pass filter to determine the rotor position.

[0089] In an optional implementation manner of an embodiment of the present application, the fourth processing unit in the embodiment of the present application includes: a first processing subunit, used to set the value of a to a value between -1 and 0, and set the value of b to not equal to 0, so as to convert the low-pass filter in the phase-locked loop into a band-pass filter; a second processing subunit, used to determine the rotor position based on the phase-locked loop after setting the values ​​of a and b.

[0090] In an optional implementation manner of an embodiment of the present application, the control module in the embodiment of the present application includes: a fifth processing unit, used to adjust the switch in the matching capacitor circuit in the compressor so that the capacitance value in the matching capacitor circuit matches the capacitance value, wherein the matching capacitor circuit is composed of multiple parallel circuits, and each branch is composed of one or more capacitors and switches in series; a sixth processing unit, used to preheat the compressor through a resonant circuit formed by the matching capacitor circuit and the coil of the compressor; a control unit, used to control the compressor based on the rotor position of the input controller and the resonant frequency determined by the capacitance value and the inductance parameter; wherein the inductance parameter includes a first inductance parameter and a second inductance parameter.

[0091] In an optional implementation manner of an embodiment of the present application, the fifth processing unit in the embodiment of the present application includes: a third processing sub-unit, used to determine the number of capacitors required to be turned on in the matching capacitor circuit based on the capacitance value; a fourth processing sub-unit, used to determine the number of switches required to be turned on based on the number of capacitors; and a fifth processing sub-unit, used to control the conduction and closing of switches in the matching capacitor circuit based on the number of switches required to be turned on.

[0092] In an optional implementation manner of an embodiment of the present application, the control unit in the embodiment of the present application includes: a sixth processing subunit, used to determine the resonant frequency fopt of the compressor through the following formula: fopt = 1 / 2πL×C; wherein L is the inductance value of the compressor coil, and C is the capacitance value; a control subunit, used to control the operation of the compressor based on the determined resonant frequency and rotor position.

[0093] like Figure 7 As shown, the embodiment of the present application provides a device, including a processor 711, a communication interface 712, a memory 713 and a communication bus 714, wherein the processor 711, the communication interface 712, and the memory 713 communicate with each other through the communication bus 714.

[0094] Memory 713, for storing computer programs;

[0095] In one embodiment of the present application, the processor 711 is used to execute the program stored in the memory 713 to implement the compressor control method provided by any of the aforementioned method embodiments, and its role is similar and will not be repeated here.

[0096] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the compressor control method provided in any of the aforementioned method embodiments are implemented.

[0097] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0098] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course, by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the relevant technology, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling 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 certain parts of the embodiment.

[0099] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0100] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling a compressor, characterized in that: include: In the case where the compressor rotor does not rotate, a high-frequency voltage signal is injected into the compressor at a preset frequency, and positive-sequence current and negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor are extracted; determining a first inductance parameter and a second inductance parameter of the compressor by using the preset frequency, the high-frequency signal, the positive-sequence current, and the negative-sequence current, wherein the first inductance parameter represents a d-axis inductance parameter of the compressor, and the second inductance parameter represents a q-axis inductance parameter of the compressor; Matching a corresponding capacitance value from a database based on the first inductance parameter and the second inductance parameter, and determining the compressor rotor position based on the negative sequence current and a preset phase-locked loop formula; The capacitance value and the compressor rotor position are input into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor.

2. The method according to claim 1, characterized in that Determining the first inductance parameter and the second inductance parameter of the compressor by using the preset frequency, the high-frequency signal, the positive-sequence current, and the negative-sequence current includes: determining a sum of the positive-sequence current and the negative-sequence current, multiplying the sum by the preset frequency to obtain a first product result, and determining a ratio of the high-frequency signal to the first product result as the first inductance parameter; Determine a difference between the positive sequence current and the negative sequence current, multiply the difference by the preset frequency to obtain a second product result, and determine a ratio of the high frequency signal to the second product result as the second inductance parameter.

3. The method according to claim 1, characterized in that Determining the compressor rotor position based on the negative sequence current and a preset phase-locked loop formula includes: The formula in the phase-locked loop is preset to the following form: y=(k i1 s a +k d s b )(k p +k i2 s c )x Among them, k i1 , k d , k p , k i2 is a coefficient greater than zero, a and c are coefficients less than 0, b is a coefficient greater than 0, s is the differential operator, x is the negative sequence current, and y is the rotor position; The rotor position is determined by adjusting the values ​​of a and b so that the low-pass filter in the phase-locked loop is converted into a band-pass filter.

4. The method according to claim 3, characterized in that Adjusting the values ​​of a and b to convert a low-pass filter in the phase-locked loop into a band-pass filter to determine the rotor position includes: The value of a is set to a value between -1 and 0, and the value of b is set to be not equal to 0, so as to convert the low-pass filter in the phase-locked loop into a band-pass filter; The rotor position is determined based on the phase-locked loop after setting the values ​​of a and b.

5. The method according to claim 1, wherein Inputting the capacitance value and the compressor rotor position into a controller of the compressor to adjust the resonant frequency and thereby control the operation of the compressor includes: adjusting a switch in a matching capacitor circuit in the compressor so that a capacitance value in the matching capacitor circuit matches the capacitance value, wherein the matching capacitor circuit is composed of a plurality of parallel circuits, each branch of which is composed of one or more capacitors and switches connected in series; preheating the compressor through a resonant circuit formed by the matching capacitor circuit and the coil of the compressor; The compressor is controlled based on the rotor position input to the controller and a resonant frequency determined by the capacitance value and inductance parameters; wherein the inductance parameters include the first inductance parameter and the second inductance parameter.

6. The method according to claim 5, characterized in that Adjusting a switch in a matching capacitor circuit in the compressor so that a capacitance value in the matching capacitor circuit matches the capacitance value includes: Determining the number of capacitors required to be turned on in the matching capacitor circuit based on the capacitance value; Determining the number of switches that need to be turned on based on the number of capacitors; The switches in the matching capacitor circuit are controlled to be turned on and off based on the number of switches required to be turned on.

7. The method according to claim 5, characterized in that Controlling the compressor based on the rotor position input to the controller and a resonant frequency determined by the capacitance and inductance parameters, comprising: The resonant frequency fopt of the compressor is determined by the following formula: fopt=1 / 2πL×C Wherein, L is the inductance value of the compressor coil, and C is the capacitance value; Operation of the compressor is controlled based on the determined resonant frequency and the rotor position.

8. A control device for a compressor, characterized in that: include: a first processing module, configured to inject a high-frequency voltage signal into the compressor at a preset frequency when the compressor rotor is not rotating, and extract a positive-sequence current and a negative-sequence current of the compressor when the high-frequency voltage signal is injected into the compressor; a second processing module, configured to determine a first inductance parameter and a second inductance parameter of the compressor according to the preset frequency, the high-frequency signal, the positive-sequence current, and the negative-sequence current, wherein the first inductance parameter represents a d-axis inductance parameter of the compressor, and the second inductance parameter represents a q-axis inductance parameter of the compressor; a third processing module, configured to match a corresponding capacitance value from a database based on the first inductance parameter and the second inductance parameter, and determine a rotor position of the compressor based on the negative sequence current and a preset phase-locked loop formula; The control module is used to input the capacitance value and the compressor rotor position into the controller of the compressor to adjust the resonant frequency and thus control the operation of the compressor.

9. A device, characterized in that include: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute the compressor control method according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that Computer-executable instructions are stored, and the computer-executable instructions are used to execute the compressor control method according to any one of claims 1 to 7.

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