Variable frequency controller, master control driving board and refrigerator

Abstract

The invention relates to a frequency conversion controller, a main control driving board and a refrigerator. The variable frequency controller is connected with a compressor through a frequency converter, and the variable frequency controller is configured to obtain an electrical parameter group numerical value of the compressor under the condition that the compressor is in a static state; according to a preset compressor electrical parameter library and the obtained electrical parameter group numerical values, target starting parameter group numerical values of the compressor are determined, and the compressor electrical parameter library comprises the incidence relation between the electrical parameter group numerical values and the starting parameter group numerical values of multiple compressors of different specifications; according to the obtained electrical parameter group numerical value, the operation parameter group numerical value of the compressor is calculated; the problem that cost is high when compressor assemblies of different specifications are replaced is solved.

Description

Technical Field

[0001] This application relates to the field of frequency conversion control technology, and in particular to a frequency conversion controller, a main control drive board, and a refrigerator. Background Technology

[0002] Typically, refrigerator compressors have built-in permanent magnet synchronous motors. In some production scenarios (such as multi-supplier adaptation, customized needs, etc.), in addition to the main materials, a single refrigerator needs to prepare multiple compressors of different specifications as spare materials.

[0003] Because the electrical parameters of the motor body of compressors of different specifications (such as salient pole inductance, sudden pole inductance, and phase resistance) are different, the variable frequency drive parameters of the corresponding variable frequency controller will be different. If a compressor of different specifications is replaced without the corresponding variable frequency controller, it is easy to cause the motor to fail to start or to run abnormally.

[0004] In related technologies, in order to achieve multi-dimensional performance optimization, the frequency converter is integrated with the refrigerator's main control board. When replacing the compressor with a different specification, the integrated board needs to be replaced simultaneously, resulting in a relatively high overall replacement cost. Summary of the Invention

[0005] This application provides a frequency converter, a main control drive board, and a refrigerator to solve the problem of high cost when replacing compressors of different specifications.

[0006] In a first aspect, some embodiments provide a variable frequency controller connected to a compressor via a frequency converter, the variable frequency controller being configured to:

[0007] With the compressor in a stationary state, obtain the values ​​of the compressor's electrical parameter set;

[0008] Based on the preset compressor electrical parameter library and the obtained electrical parameter group values, the target start parameter group values ​​of the compressor are determined. The compressor electrical parameter library includes the correlation between the electrical parameter group values ​​and start parameter group values ​​of multiple compressors of different specifications.

[0009] Based on the obtained electrical parameter values, calculate the operating parameter values ​​of the compressor.

[0010] In one embodiment, the obtained electrical parameter set values ​​include multiple electrical parameter values;

[0011] The compressor electrical parameter library includes multiple data groups, each data group including a list of electrical parameter group values ​​and a list of start-up parameter group values, the list of electrical parameter group values ​​including multiple list of electrical parameter values;

[0012] The frequency converter is configured as follows:

[0013] In the compressor electrical parameter library, a target data group matching the target electrical parameter value is queried, wherein the target electrical parameter value is one of the plurality of electrical parameter values, and the target data group includes a target list of electrical parameter values ​​matching the target electrical parameter value;

[0014] If a target data group is found, then the electrical parameter values ​​of each list in the target data group, excluding the target list electrical parameter values, are determined, and the error values ​​corresponding to each electrical parameter value excluding the target electrical parameter value are determined. If each error value is within a preset error allowable range, then the list start parameter group value in the target data group is determined as the target start parameter group value.

[0015] In one embodiment, the frequency converter is configured to:

[0016] If multiple target data groups are found, then for each target data group: determine the electrical parameter values ​​of each list in the target data group excluding the target list electrical parameter values, and respectively compare them with the error values ​​corresponding to each electrical parameter value in the multiple electrical parameter values ​​excluding the target electrical parameter values. If each error value is within the preset error allowable range, then determine the target data group as a candidate data group.

[0017] If a candidate data group exists, the list startup parameter group value in the candidate data group is determined as the target startup parameter group value.

[0018] If there are multiple candidate data groups, the list of startup parameter group values ​​in the candidate data group containing the most minimum error value among all the error values ​​shall be determined as the target startup parameter group value.

[0019] In one embodiment, the frequency converter is configured to:

[0020] If the target data group is not found, a new target electrical parameter value is obtained by adding a preset percentage multiple of the target electrical parameter value to the target electrical parameter value.

[0021] Based on the new target electrical parameter value, perform the step of querying the target data group that matches the new target electrical parameter value in the compressor electrical parameter library.

[0022] In one embodiment, the plurality of electrical parameter values ​​include salient inductance, salient inductance, and phase resistance.

[0023] The frequency converter is configured to determine the salient inductance value as the target electrical parameter value.

[0024] In one embodiment, the starting parameter set values ​​include at least one of the following: number of pole pairs, starting angle, starting acceleration, starting torque, minimum speed, maximum speed, and maximum power;

[0025] The operating parameter set values ​​include at least one of the following: the proportional coefficient of the current loop, the integral coefficient of the current loop, the proportional coefficient of the speed loop, the integral coefficient of the speed loop, the proportional coefficient of the observer, and the integral coefficient of the observer.

[0026] In one embodiment, the electrical parameter set values ​​include the salient inductance value, the salient inductance value, and the phase resistance value;

[0027] The frequency converter is configured as follows:

[0028] The salient pole inductance value and the sudden pole inductance value are obtained by using a six-phase current pulse method and a preset inductance identification algorithm;

[0029] The inverter is controlled to output a constant current to the compressor, and the phase resistance value is determined based on the constant current, the bus voltage of the inverter, and a preset resistance identification algorithm.

[0030] In one embodiment, the frequency converter is configured to:

[0031] The steps of performing the six-phase current pulse method and the preset inductance identification algorithm for a first preset number of times to obtain the salient inductance value and the sudden inductance value are performed to obtain multiple salient inductance values ​​and multiple sudden inductance values. The average value of the multiple salient inductance values ​​is used as the salient inductance value in the obtained electrical parameter group value, and the average value of the multiple sudden inductance values ​​is used as the sudden inductance value in the obtained electrical parameter group value.

[0032] The process involves executing a second preset number of steps to control the frequency converter to output a constant current to the compressor, and determining the phase resistance value based on the constant current, the bus voltage of the frequency converter, and a preset resistance identification algorithm. This process yields multiple phase resistance values, and the average of these multiple phase resistance values ​​is used as the phase resistance value in the obtained electrical parameter set.

[0033] Each time the aforementioned frequency converter is powered on, it first acquires the values ​​of the compressor's electrical parameters while the compressor is stationary. Then, it queries the compressor's electrical parameter library for the target start-up parameter values ​​of the compressor that match the acquired electrical parameter values, and directly calculates the compressor's operating parameter values ​​based on the acquired electrical parameter values. Thus, the frequency converter can be controlled to drive the compressor to start and run based on the target start-up parameter values ​​and the operating parameter values.

[0034] Understandably, the compressor electrical parameter database contains the correlation between the electrical parameter group values ​​and the starting parameter group values ​​of multiple compressors of different specifications. The aforementioned frequency converter can obtain the compressor's electrical parameter group values ​​and then search the compressor electrical parameter database for the target starting parameter group values ​​that match the obtained electrical parameter group values. The target starting parameter group values ​​are the starting parameter group values ​​used to drive the compressor to be controlled to start. Furthermore, the operating parameter group values ​​are directly calculated based on the obtained electrical parameter group values, and the calculated operating parameter group values ​​are the operating parameter group values ​​used to drive the compressor to be controlled to run.

[0035] Thus, when replacing compressors of different specifications, this embodiment of the application only needs to use the same frequency converter to automatically identify compressors of different specifications, match them with the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values. Then, it can drive the compressor to start and run based on the target start-up parameter set values ​​and the operating parameter set values. In other words, the technical solution of this embodiment of the application only needs to use the same frequency converter to automatically identify compressors of different specifications, match them with the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values. This allows the compressor to start and run based on the target start-up parameter set values ​​and the operating parameter set values, without needing to replace the frequency converter, and consequently without needing to replace the integrated board (the integrated board is a circuit board that integrates the frequency converter and the refrigerator's main control board). This greatly improves the utilization rate of the frequency converter and the integrated board, saves on the preparation of materials for the frequency converter and the integrated board, and thus significantly reduces costs.

[0036] Based on the same inventive concept, in a second aspect, some embodiments also provide a main control drive board, which includes a refrigerator main control board and the frequency converter described in the first aspect above.

[0037] When replacing compressors of different specifications, the aforementioned main control drive board, based on the frequency converter within the main control drive board, can automatically identify compressors of different specifications, match them with the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values. Thus, it drives the compressor to start and run based on the target start-up parameter set values ​​and operating parameter set values, without the need to replace the frequency converter, and consequently the main control drive board. This greatly improves the utilization rate of the frequency converter and main control drive board, saves on spare parts for the frequency converter and main control drive board, and thus significantly reduces costs.

[0038] Based on the same inventive concept, in a third aspect, some embodiments also provide a refrigerator, the refrigerator including the frequency converter described in the first aspect above.

[0039] When replacing compressors of different specifications, the inverter controller in the refrigerator can automatically identify the compressors of different specifications, match the corresponding target start parameter set values ​​for them, and calculate the corresponding operating parameter set values ​​for them. Thus, it drives the compressor to start and run based on the target start parameter set values ​​and operating parameter set values, without the need to replace the inverter controller, and consequently without the need to replace the integrated board (the integrated board is a circuit board that integrates the inverter controller and the refrigerator's main control board). This greatly improves the utilization rate of the inverter controller and integrated board, saves on the preparation of inverter controller and integrated board materials, and thus greatly reduces costs. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is one of the flowcharts illustrating the execution method of the frequency converter controller in one embodiment;

[0042] Figure 2 This is a second flowchart illustrating the execution method of the frequency converter controller in one embodiment;

[0043] Figure 3 This is the third flowchart of the variable frequency controller execution method in one embodiment. Detailed Implementation

[0044] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0045] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0046] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0047] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0048] The term "module" refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0049] In some exemplary embodiments, the refrigerator may include a main control board, a frequency converter, an inverter, and a compressor. The compressor has a built-in motor. The inverter is used to drive the compressor according to the control signals from the frequency converter, that is, to drive the motor inside the compressor.

[0050] The technical solutions of this application embodiment, for example but not limited to, are applied in the refrigerator production stage, in scenarios where different specifications of compressors are replaced in a refrigerator. Regardless of the type of compressor replaced, this application embodiment can always automatically identify different specifications of compressors through the same frequency converter, match the corresponding target start parameter group values ​​for them, and calculate the corresponding operating parameter group values ​​for them. Then, it can drive the compressor to start and run based on the target start parameter group values ​​and the operating parameter group values, so that there is no need to replace the frequency converter or the main control drive board, thus saving costs.

[0051] The technical solutions of this application embodiment, for example but not limited to, are applied in the after-sales stage of refrigerators, in scenarios where different specifications of compressors are replaced in refrigerators. Regardless of the type of compressor replaced, this application embodiment can always automatically identify different specifications of compressors through the same frequency converter, match the corresponding target start parameter group values ​​for them, and calculate the corresponding operating parameter group values ​​for them. Then, it can drive them to start and run based on the target start parameter group values ​​and operating parameter group values, so that there is no need to replace the frequency converter or the main control drive board, thus saving costs.

[0052] The technical solution of this application embodiment allows the refrigerator or the inverter controller to automatically identify compressors of different specifications each time they are powered on, match them with the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values.

[0053] The frequency converter provided in this application embodiment is applied to refrigerators, for example, but not limited to; the frequency converter can be connected to the compressor via a frequency converter, and then drive the compressor via the frequency converter.

[0054] In some exemplary embodiments, a frequency converter is provided, with reference to Figure 1The frequency converter can be configured to perform the following steps S101~S103.

[0055] S101: Obtain the values ​​of the compressor's electrical parameters when the compressor is stationary.

[0056] This refers to a situation where the compressor is stationary, such as, but not limited to, a situation where the motor is powered on but its speed is zero. The electrical parameter set values ​​of the compressor can be understood as the electrical parameter set of the motor. As an example, the inverter can be controlled to output a corresponding current to the motor, and then, based on the bus voltage inside the inverter, the current output by the inverter to the motor, and preset related algorithms, the electrical parameter set values ​​are determined.

[0057] As an example, the electrical parameter group values ​​include the salient pole inductance value Ld, the salient pole inductance value Lq, and the phase resistance value Rs. The salient pole inductance value Ld can be understood as the inductance value assuming the motor rotor has no magnetic pole saliency / concavity difference. The salient pole inductance value Lq can be understood as the actual inductance value when the motor rotor has magnetic pole saliency / concavity difference. The phase resistance value Rs can be understood as the resistance of each phase coil of the motor (e.g., the resistance of the U-phase coil, the V-phase coil, and the W-phase coil).

[0058] As an example, the electrical parameter set values ​​of the compressor can be obtained based on the six-phase current pulse method and the voltage equation of the permanent magnet synchronous motor in the dq-axis synchronous rotating coordinate system. Then, by substituting the motor speed, the bus voltage inside the frequency converter, and the corresponding current output from the frequency converter to the motor into the voltage equation, and based on the six-phase current pulse method, the salient pole inductance value Ld, the sudden pole inductance value Lq, and the phase resistance value Rs can be determined respectively.

[0059] In this step, controlling the motor to run at zero speed during the acquisition of electrical parameter values ​​can eliminate dynamic interference, ensure that the motor is accurately energized, thereby obtaining effective current values ​​and improving the accuracy of the determined electrical parameter values.

[0060] S102, based on the preset compressor electrical parameter library and the obtained electrical parameter group values, determine the target start parameter group values ​​of the compressor. The compressor electrical parameter library includes the correlation between the electrical parameter group values ​​and start parameter group values ​​of multiple compressors of different specifications.

[0061] Among them, the target starting parameter group value that matches the obtained electrical parameter group value can be queried in the compressor electrical parameter library.

[0062] In this step, the frequency converter controller is pre-configured with a compressor electrical parameter library. For example, the compressor electrical parameter library may include a preset list, as shown in Table 1. For example, the starting parameter group values ​​include at least one of the following: number of pole pairs, starting acceleration, starting angle, starting torque, minimum speed, maximum speed, and maximum power. Here, the number of pole pairs can be understood as the number of magnetic pole pairs on the motor rotor. Starting acceleration can be understood as the phase angle of the frequency converter's output voltage when the motor starts. Starting angle can be understood as the rate of speed increase during startup. Starting torque can be understood as the minimum torque that the motor can output during startup. Minimum speed can be understood as the minimum speed at which the compressor can operate stably. Maximum speed can be understood as the maximum safe speed allowed by the compressor. Maximum power can be understood as the maximum input power allowed when the compressor is running.

[0063] As an example, referring to Table 1, if the obtained electrical parameter group value matches the electrical parameter group value 1 in Table 1 (matching here can be understood as the values ​​being exactly the same or very close), then the target starting parameter group value that matches the obtained electrical parameter group value is the starting parameter group value 1 in Table 1, and it can be determined that the compressor to be controlled is a compressor of specification 1.

[0064] Table 1

[0065]

[0066] S103, calculate the operating parameter group values ​​based on the obtained electrical parameter group values.

[0067] In this embodiment of the application, in addition to querying the target start-up parameter group value based on the obtained electrical parameter group value to drive the compressor to be controlled to start, the operating parameter group value is also directly calculated based on the obtained electrical parameter group value to drive the compressor to be controlled to run.

[0068] As an example, the operating parameter set values ​​include at least one of the following: the proportional coefficient Kp of the current loop, the integral coefficient Ki of the current loop, the proportional coefficient Kp of the speed loop, the integral coefficient Ki of the speed loop, the proportional coefficient Kp of the observer, and the integral coefficient Ki of the observer.

[0069] In some exemplary embodiments, the frequency converter may be configured to perform step S104, controlling the frequency converter to drive the compressor to be controlled to start operation based on the target start-up parameter values ​​and the closed-loop control parameter values.

[0070] When replacing compressors of different specifications, this embodiment of the application only requires the same inverter controller to automatically identify the compressors of different specifications, match the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values, thereby driving the compressor to start and run based on the target start-up parameter set values ​​and the operating parameter set values. In other words, the technical solution of this embodiment of the application only requires the same inverter controller to automatically identify compressors of different specifications, match the corresponding target start-up parameter set values, and calculate the corresponding operating parameter set values, thereby driving the compressor to start and run based on the target start-up parameter set values ​​and the closed-loop control parameter set values, without the need to replace the inverter controller, and consequently without the need to replace the integrated board (the integrated board is a circuit board that integrates the inverter controller and the refrigerator's main control board), greatly improving the utilization rate of the inverter controller and the integrated board, saving on the preparation of materials for the inverter controller and the integrated board, and thus greatly reducing costs.

[0071] In some exemplary embodiments, the electrical parameter set values ​​include the salient inductance value Ld, the salient inductance value Lq, and the phase resistance value Rs, with reference to... Figure 2 The frequency converter can be configured to perform the following steps S201~S202.

[0072] S201 uses a six-phase current pulse method and a preset inductance identification algorithm to obtain the salient pole inductance value and the sudden pole inductance value.

[0073] The inductance value can be obtained based on the principle that an inductor impedes a change in current. During the inductance value acquisition process, the change in current per unit time can be measured, for example, measuring the increase in current from 0 to i within time t.

[0074] As an example, taking the bus voltage u inside the inverter as a reference, by opening the U-phase upper bridge and V-phase lower bridge inside the inverter for a period of time t, the maximum current i during time t is measured. Since the motor does not rotate (i.e., the motor speed is zero), the bus voltage u is obtained. Then, according to the formula u = Rs*i + L*i / t, given the phase resistance Rs (which can be calculated in step S202), L can be calculated. The above operation is performed sequentially on the U, V, and W phases, obtaining a total of six different inductance L values. The maximum value of L is selected as the salient pole inductance value Lq, and the minimum value of L is selected as the non-salient pole inductance value Ld.

[0075] S202 controls the frequency converter to output a constant current to the compressor, and determines the phase resistance value based on the constant current, the frequency converter's bus voltage, and a preset resistance identification algorithm.

[0076] As an example, the frequency converter outputs a constant current i to one phase of the motor and keeps i constant. If the current is constant, the formula u = Rs*i + L*i / t in step S201 can be transformed into u = Rs*i. By substituting the bus voltage u and the constant current i into the formula u = Rs*i, Rs can be calculated.

[0077] In some exemplary embodiments, the frequency converter executes step S201 a first preset number of times to obtain multiple salient inductance values ​​and multiple transient inductance values. The average value of the multiple salient inductance values ​​is used as the salient inductance value in the acquired electrical parameter set, and the average value of the multiple transient inductance values ​​is used as the transient inductance value in the acquired electrical parameter set. The frequency converter executes step S202 a second preset number of times to obtain multiple phase resistance values, and the average value of the multiple phase resistance values ​​is used as the phase resistance value in the acquired electrical parameter set. The specific values ​​of the first and second preset numbers can be set as needed according to the actual application, ultimately obtaining accurate salient inductance, transient inductance, and phase resistance values.

[0078] In this embodiment, the average value of multiple salient inductance values ​​is used as the salient inductance value in the obtained electrical parameter set, improving the accuracy of the salient inductance value in the obtained electrical parameter set; the average value of multiple transient inductance values ​​is used as the transient inductance value in the obtained electrical parameter set, improving the accuracy of the transient inductance value in the obtained electrical parameter set; and the average value of multiple phase resistance values ​​is used as the phase resistance value in the obtained electrical parameter set, improving the accuracy of the phase resistance value in the obtained electrical parameter set. Furthermore, the specific number of preset cycles can be configured according to actual application needs and is not specifically limited; as an example, the preset number of cycles could be three, four, five, six, seven, eight, etc.

[0079] In some exemplary embodiments, the acquired electrical parameter group values ​​include multiple electrical parameter values. The compressor electrical parameter library includes multiple data groups, each data group including a list of electrical parameter group values ​​and a list of start-up parameter group values. The list of electrical parameter group values ​​includes multiple list electrical parameter values. As an example, referring to Table 1, the list of electrical parameter group values ​​for data group 1 is electrical parameter group value 1, the list of start-up parameter group values ​​for data group 1 is start-up parameter group value 1, the list of electrical parameter group values ​​for data group 2 is electrical parameter group value 2, and the list of start-up parameter group values ​​for data group 2 is start-up parameter group value 2.

[0080] refer to Figure 3 The frequency converter can be configured to perform the following steps S301~S304.

[0081] S301, in the compressor electrical parameter library, query the target data group that matches the target electrical parameter value, where the target electrical parameter value is one of multiple electrical parameter values, and the target data group includes the target list electrical parameter values ​​that match the target electrical parameter value.

[0082] As an example, the obtained electrical parameter group values ​​are: salient inductance value Ld0, sudden inductance value Lq0, and phase resistance value Rs0. Any one of these can be selected as the target electrical parameter value; for example, the salient inductance value Ld0 can be selected as the target electrical parameter value. As an example, in Table 1, the target data group matching the salient inductance value Ld0 is queried. If Ld0 = Ld1, then the target data group is data group 1; this can be considered as only one target data group being queried. If Ld0 ≈ Ld1, Ld0 ≈ Ld2, and Ld0 = Ld3, then the target data groups are data group 1, data group 2, and data group 3; this can be considered as multiple target data groups being queried. If Ld0 is not equal to or approximately equal to Ld1, Ld2, Ld3, and Ld4, this can be considered as no target data group being queried.

[0083] Understandably, compared to the surge inductance and phase resistance, the salient inductance is generally more stable, reliable, and easier to measure; while the surge inductance and phase resistance typically have lower stability and larger errors. Therefore, during the matching process, the salient inductance value Ld0 can be preferentially selected as the target electrical parameter value to make the final matching result more reliable and accurate.

[0084] S302, if a target data group is found, then determine the list electrical parameter values ​​in the target data group excluding the target list electrical parameter values, and compare them with the error values ​​corresponding to the electrical parameter values ​​excluding the target electrical parameter values. If all error values ​​are within the preset error allowable range, then determine the list start parameter group values ​​in the target data group as the target start parameter group values.

[0085] Based on the example in step S301, if a target data group is found to be data group 1, then the electrical parameter values ​​Lq1 and Rs1 in data group 1, excluding Ld0, are determined to have two error values ​​with Lq0 and Rs0 respectively, namely the error value between Lq1 and Lq0 (denoted as error value 1) and the error value between Rs1 and Rs0 (denoted as error value 2). If error value 1 is within the preset error allowable range and error value 2 is within the preset error allowable range, then the list start parameter group value of data group 1 is determined as the target start parameter group value, and the list start parameter group value of data group 1 is the start parameter group value 1, that is, the start parameter group value 1 is determined as the target start parameter group value.

[0086] In some exemplary embodiments, if at least one of error value 1 and error value 2 is not within the preset error allowable range, step S304 can be executed.

[0087] S303, if multiple target data groups are found, then for each target data group: determine the electrical parameter values ​​of each list other than the target list electrical parameter values ​​in the target data group, and compare them with the error values ​​corresponding to each electrical parameter value other than the target electrical parameter values ​​in the multiple electrical parameter values. If each error value is within the preset error allowable range, then the target data group is determined as a candidate data group.

[0088] Based on the example in step S301, multiple target data groups are found, namely data group 1, data group 2, and data group 3. As an example, if at least one of error value 1 and error value 2 is not within the preset error allowable range, then data group 1 is not determined as a candidate data group; among the error values ​​of Lq2 and Lq0 (denoted as error value 3) and the error values ​​of Rs2 and Rs0 (denoted as error value 4), error values ​​3 and 4 are both within the preset error allowable range, therefore data group 2 is determined as a candidate data group; among the error values ​​of Lq3 and Lq0 (denoted as error value 5) and the error values ​​of Rs3 and Rs0 (denoted as error value 6), error values ​​5 and 6 are both within the preset error allowable range, therefore data group 3 is determined as a candidate data group.

[0089] If there is a candidate data group, the values ​​of the startup parameter group in the list of candidate data groups will be determined as the values ​​of the target startup parameter group.

[0090] As an example, if at least one of error values ​​1 and 2 is not within the preset error allowable range, then data group 1 is not determined as a candidate data group; if at least one of error values ​​3 and 4 is not within the preset error allowable range, then data group 2 is not determined as a candidate data group; if at least one of error values ​​5 and 6 is not within the preset error allowable range, then data group 2 is not determined as a candidate data group; if both error values ​​5 and 6 are within the preset error allowable range, then data group 3 is determined as a candidate data group. In this case, the list startup parameter group value in data group 3 can be determined as the target startup parameter group value, and the list startup parameter group value of data group 3 is startup parameter group value 3, that is, startup parameter group value 3 is determined as the target startup parameter group value.

[0091] If there are multiple candidate data sets, the list of startup parameter group values ​​in the candidate data set containing the most minimum error values ​​will be determined as the target startup parameter group values.

[0092] As an example, error values ​​3 and 4 are both within the preset error allowable range, therefore data group 2 is selected as the candidate data group; error values ​​5 and 6 are both within the preset error allowable range, therefore data group 3 is selected as the candidate data group. Further, it is determined that the minimum value among error values ​​3 and 5 is the minimum error value, and the minimum value among error values ​​4 and 6 is also the minimum error value. Assuming the minimum value among error values ​​3 and 5 is error value 3, and the minimum value among error values ​​4 and 6 is error value 4, then the list startup parameter group value in data group 2 can be determined as the target startup parameter group value, and the list startup parameter group value of data group 2 is startup parameter group value 2, that is, startup parameter group value 2 is determined as the target startup parameter group value.

[0093] In some exemplary embodiments, when there are multiple alternative data groups, the list startup parameter group value in one of the alternative data groups can be arbitrarily selected and determined as the target startup parameter group value.

[0094] S304, if no target data group is found, the target electrical parameter value is added to the target electrical parameter value by a preset percentage multiple to obtain a new target electrical parameter value; based on the new target electrical parameter value, the step of querying the target data group that matches the new target electrical parameter value in the compressor electrical parameter library is executed.

[0095] In this step, based on the new target electrical parameter value, step S301 can be executed, replacing the original target electrical parameter value in step S301 with the new target electrical parameter value and executing step S301, ultimately achieving parameter matching.

[0096] As an example, if the target electrical parameter value is Ld0, then the new target electrical parameter values ​​can be selected sequentially as Ld0±(Ld0×5%), Ld0±2[(Ld0×5%)], Ld0±3[(Ld0×5%)], Ld0±4[(Ld0×5%)], etc., that is, the preset percentage multiple can be ±5%, etc. The preset percentage multiple can be configured according to actual application requirements and is not limited thereto. In other words, when the new target electrical parameter value Ld0±(Ld0×5%) fails to match, the new target electrical parameter value Ld0±2[(Ld0×5%)] can be used for matching, and when the new target electrical parameter value Ld0±2[(Ld0×5%)] fails to match, the new target electrical parameter value Ld0±3[(Ld0×5%)]... can be used until a match is successful.

[0097] In some exemplary embodiments, a main control drive board is provided, which includes a refrigerator main control board and a frequency converter as provided in any of the above embodiments; as an example, the refrigerator main control board and the frequency converter are integrated.

[0098] The main control drive board and frequency converter provided in this application are based on the same inventive concept, can solve the same technical problem, and thus achieve the same technical effect. Repeated content will not be repeated here.

[0099] In some exemplary embodiments, a frequency converter may also be integrated on the main control drive board.

[0100] In some exemplary embodiments, a refrigerator is provided that includes an inverter controller as provided in any of the above embodiments.

[0101] The refrigerator and frequency converter provided in this application belong to the same inventive concept, can solve the same technical problem, and thus achieve the same technical effect. Repeated content will not be repeated here.

[0102] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A frequency converter, characterized in that, The frequency converter is connected to the compressor via a frequency converter, and the frequency converter is configured to: With the compressor in a stationary state, obtain the values ​​of the compressor's electrical parameter set; Based on the preset compressor electrical parameter library and the obtained electrical parameter group values, the target start parameter group values ​​of the compressor are determined. The compressor electrical parameter library includes the correlation between the electrical parameter group values ​​and start parameter group values ​​of multiple compressors of different specifications. Based on the obtained electrical parameter values, calculate the operating parameter values ​​of the compressor.

2. The frequency converter according to claim 1, characterized in that, The obtained electrical parameter set values ​​include multiple electrical parameter values; The compressor electrical parameter library includes multiple data groups, each data group including a list of electrical parameter group values ​​and a list of start-up parameter group values, the list of electrical parameter group values ​​including multiple list of electrical parameter values; The frequency converter is configured as follows: In the compressor electrical parameter library, a target data group matching the target electrical parameter value is queried, wherein the target electrical parameter value is one of the plurality of electrical parameter values, and the target data group includes a target list of electrical parameter values ​​matching the target electrical parameter value; If a target data group is found, then the electrical parameter values ​​of each list in the target data group, excluding the target list electrical parameter values, are determined, and the error values ​​corresponding to each electrical parameter value excluding the target electrical parameter value are determined. If each error value is within a preset error allowable range, then the list start parameter group value in the target data group is determined as the target start parameter group value.

3. The frequency converter according to claim 2, characterized in that, The frequency converter is configured as follows: If multiple target data groups are found, then for each target data group: determine the electrical parameter values ​​of each list in the target data group excluding the target list electrical parameter values, and respectively compare them with the error values ​​corresponding to each electrical parameter value in the multiple electrical parameter values ​​excluding the target electrical parameter values. If each error value is within the preset error allowable range, then determine the target data group as a candidate data group. If a candidate data group exists, the list startup parameter group value in the candidate data group is determined as the target startup parameter group value. If there are multiple candidate data groups, the list of startup parameter group values ​​in the candidate data group containing the most minimum error value among all the error values ​​shall be determined as the target startup parameter group value.

4. The frequency converter according to claim 2, characterized in that, The frequency converter is configured as follows: If the target data group is not found, a new target electrical parameter value is obtained by adding a preset percentage multiple of the target electrical parameter value to the target electrical parameter value. Based on the new target electrical parameter value, perform the step of querying the target data group that matches the new target electrical parameter value in the compressor electrical parameter library.

5. The frequency converter according to claim 2, characterized in that, The multiple electrical parameter values ​​include the salient inductance value, the salient inductance value, and the phase resistance value; The frequency converter is configured to determine the salient inductance value as the target electrical parameter value.

6. The frequency converter according to claim 2, characterized in that, The starting parameter group values ​​include at least one of the following: number of pole pairs, starting angle, starting acceleration, starting torque, minimum speed, maximum speed, and maximum power; The operating parameter set values ​​include at least one of the following: the proportional coefficient of the current loop, the integral coefficient of the current loop, the proportional coefficient of the speed loop, the integral coefficient of the speed loop, the proportional coefficient of the observer, and the integral coefficient of the observer.

7. The frequency converter according to claim 1, characterized in that, The electrical parameter set values ​​include the salient inductance value, the salient inductance value, and the phase resistance value; The frequency converter is configured as follows: The salient pole inductance value and the sudden pole inductance value are obtained by using a six-phase current pulse method and a preset inductance identification algorithm; The inverter is controlled to output a constant current to the compressor, and the phase resistance value is determined based on the constant current, the bus voltage of the inverter, and a preset resistance identification algorithm.

8. The frequency converter according to claim 7, characterized in that, The frequency converter is configured as follows: The steps of performing the six-phase current pulse method and the preset inductance identification algorithm for a first preset number of times to obtain the salient inductance value and the sudden inductance value are performed to obtain multiple salient inductance values ​​and multiple sudden inductance values. The average value of the multiple salient inductance values ​​is used as the salient inductance value in the obtained electrical parameter group value, and the average value of the multiple sudden inductance values ​​is used as the sudden inductance value in the obtained electrical parameter group value. The process involves executing a second preset number of steps to control the frequency converter to output a constant current to the compressor, and determining the phase resistance value based on the constant current, the bus voltage of the frequency converter, and a preset resistance identification algorithm. This process yields multiple phase resistance values, and the average of these multiple phase resistance values ​​is used as the phase resistance value in the obtained electrical parameter set.

9. A main control driver board, characterized in that, The main control drive board includes a refrigerator main control board and a frequency converter as described in any one of claims 1-8.

10. A refrigerator, characterized in that, The refrigerator includes a frequency converter as described in any one of claims 1-8.

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