Frequency Conversion Control Method, Controller and Equipment of Solid State Elastic Card Refrigeration and Heating Device

Abstract

The present invention provides a frequency conversion control method, a controller and a device for a solid-state cartridge refrigeration and heating device. The solid-state cartridge refrigeration and heating device includes a cartridge material. The frequency conversion control method first needs to obtain the current ambient temperature and the target temperature set by the user. Then, according to the ambient temperature and the target temperature, the optimal frequency conversion path of the motor in the solid-state cartridge refrigeration and heating device is determined, where the optimal frequency conversion path is the frequency conversion path when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device. Finally, the operating frequency of the motor is adjusted according to the optimal frequency conversion path. By calculating the optimal frequency conversion path, the present invention makes the frequency of the motor change according to the optimal frequency conversion path, minimizing the motor energy consumption and realizing the frequency conversion control of the solid-state cartridge refrigeration and heating device.

Description

Technical Field

[0001] The present invention belongs to the technical field of variable frequency control, and particularly relates to a variable frequency control method, a controller and a device for a solid-state cartridge refrigeration and heating device. Background Art

[0002] With the improvement of people's living standards, variable frequency air conditioners have become the first choice for people because they can control the temperature more precisely, reduce noise, and make people feel more comfortable.

[0003] In the prior art, the core of a variable frequency air conditioner is the change in the motor speed caused by the change in the motor operating frequency, and the rotor rotates through the interaction of the magnetic fields between the stator and the rotor. That is, its refrigeration and heating mainly adjust the ambient temperature by changing the speed of the compressor to achieve the best energy-saving effect. When the ambient temperature reaches the set value, the compressor stops running and only maintains the constancy of the ambient temperature; when the ambient temperature deviates from the set value, the compressor restarts and adjusts the ambient temperature by changing the speed, so as to achieve the purpose of stabilizing the ambient temperature.

[0004] However, when a variable frequency air conditioner starts up, since the ambient temperature has not reached the set temperature, it may operate at the maximum power, and at this time, it consumes more electricity than a conventional air conditioner. After the ambient temperature reaches the set temperature, the variable frequency air conditioner reduces the operating speed of the compressor through an inverter. This method may have energy losses, is strongly interfered by the external environment, and has a slow adjustment speed, resulting in the instability of the traditional air conditioner temperature control. In addition, in the prior art, when detecting the temperature of a variable frequency air conditioner, it is usually necessary to set a sensor on the coil of the air conditioner to detect the coil temperature, so as to detect the refrigeration / heating temperature of the air conditioner. This method is too cumbersome. Summary of the Invention

[0005] In view of this, the present invention provides a variable frequency control method, a controller and a device for a solid-state cartridge refrigeration and heating device, aiming to solve the problems that in the prior art, there is less research on the control of a solid-state refrigerant solid-state cartridge refrigeration and heating device, and the control effect still needs to be improved.

[0006] The first aspect of the embodiment of the present invention provides a variable frequency control method for a solid-state cartridge refrigeration and heating device, and the solid-state cartridge refrigeration and heating device includes a cartridge material;

[0007] The variable frequency control method includes:

[0008] Obtain the current ambient temperature and the target temperature set by the user;

[0009] Determine the optimal variable frequency path of the motor in the solid-state cartridge refrigeration and heating device according to the ambient temperature and the target temperature, wherein the optimal variable frequency path is the variable frequency path when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device;

[0010] Adjust the operating frequency of the motor according to the optimal frequency conversion path to minimize the motor energy consumption during the temperature regulation process when the motor loads or unloads the cartridge material.

[0011] The second aspect of the embodiments of the present invention provides a frequency conversion control device for a solid-state cartridge refrigeration and heating device, and the device includes:

[0012] An acquisition module that acquires the current ambient temperature and the target temperature set by the user;

[0013] A determination module for determining the optimal frequency conversion path of the motor in the solid-state cartridge refrigeration and heating device according to the ambient temperature and the target temperature, where the optimal frequency conversion path is the frequency conversion path when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device;

[0014] A control module for adjusting the operating frequency of the motor according to the optimal frequency conversion path to minimize the motor energy consumption during the temperature regulation process when the motor loads or unloads the cartridge material.

[0015] The third aspect of the embodiments of the present invention provides a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the frequency conversion control method of the solid-state cartridge refrigeration and heating device in the first aspect above are implemented.

[0016] The fourth aspect of the embodiments of the present invention provides a variable-frequency device including a solid-state cartridge refrigeration and heating device that implements the method in the first aspect above.

[0017] The fifth aspect of the embodiments of the present invention provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the frequency conversion control method of the solid-state cartridge refrigeration and heating device in the first aspect above are implemented.

[0018] The frequency conversion control method, controller, and device for the solid-state cartridge refrigeration and heating device provided by the embodiments of the present invention, where the solid-state cartridge refrigeration and heating device includes a cartridge material; this frequency conversion control method first needs to acquire the current ambient temperature and the target temperature set by the user; then, according to the ambient temperature and the target temperature, determine the optimal frequency conversion path of the motor in the solid-state cartridge refrigeration and heating device, where the optimal frequency conversion path is the frequency conversion path when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device; finally, adjust the operating frequency of the motor according to the optimal frequency conversion path. The present invention calculates the optimal frequency conversion path, makes the frequency of the motor change according to the optimal frequency conversion path, and minimizes the motor energy consumption as much as possible on the premise of ensuring user comfort, so as to realize the frequency conversion control of the solid-state cartridge refrigeration and heating device. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the implementation flowchart of the frequency conversion control method for the solid-state cartridge refrigeration and heating device provided by the embodiment of the present invention;

[0021] Figure 2 is the structural schematic diagram of the frequency conversion control device for the solid-state cartridge refrigeration and heating device provided by the embodiment of the present invention;

[0022] Figure 3 is the structural schematic diagram of the controller provided by the embodiment of the present invention. Specific Embodiments

[0023] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0024] Figure 1 is the implementation flowchart of the frequency conversion control method for the solid-state cartridge refrigeration and heating device provided by the embodiment of the present invention. As Figure 1 shown, in some embodiments, in the frequency conversion control method for the solid-state cartridge refrigeration and heating device, the solid-state cartridge refrigeration and heating device includes a cartridge material that is controlled by a motor; the heating or cooling temperature of the solid-state cartridge refrigeration and heating device depends on the rotational speed of the motor; the method includes:

[0025] S110, obtaining the current ambient temperature and the target temperature set by the user;

[0026] S120, determining the optimal frequency conversion path of the motor in the solid-state cartridge refrigeration and heating device according to the ambient temperature and the target temperature, where the optimal frequency conversion path is the frequency conversion path when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device;

[0027] S130, adjusting the working frequency of the motor according to the optimal frequency conversion path to minimize the motor energy consumption during the temperature adjustment process by the motor loading or unloading the cartridge material.

[0028] In the embodiments of the present invention, the user can set the target temperature in any way such as through the remote control of the solid-state cartridge refrigeration and heating device or Bluetooth control of the mobile phone. The ambient temperature is detected by a temperature sensor. The temperature sensor can be a temperature sensor installed on the solid-state cartridge refrigeration and heating device itself, or the average temperature of other temperature sensors installed indoors and connected to the solid-state cartridge refrigeration and heating device. In addition, the ambient temperature can also be the temperature value reported by the intelligent Internet of Things in the room.

[0029] In this application, the cartridge material is a shape memory alloy. When the cartridge material deforms under external loading, it generates heat and warms up. When the deformation is restored by unloading, heat is released and the temperature drops. Therefore, the solid-state cartridge refrigeration and heating device relies on stress loading and unloading of the cartridge material for heating and cooling. It can be seen that the temperature rise and fall of the solid-state cartridge refrigeration and heating device mainly depend on the deformation change of the cartridge material connected to the motor, that is, by changing the rotation speed of the motor to change the deformation change of the cartridge material. Therefore, only by controlling the working frequency of the variable-frequency motor can the refrigeration and heating temperature be accurately controlled. In practical applications, the rotation speed of the motor can be changed by changing the power frequency or the working frequency of the motor. In a variable-frequency speed regulation system of an embodiment, the rotation speed of the motor is controlled by changing the power frequency. Reducing the power frequency will reduce the rotation speed of the motor, and increasing the power frequency will increase the rotation speed of the motor. Generally, the relationship between the frequency and the rotation speed conforms to the following formula:

[0030] n = 60f / p

[0031] Wherein, n represents the rotation speed of the motor, f represents the power frequency, and p represents the number of pole pairs of the rotating magnetic field of the motor.

[0032] In another embodiment, the rotation speed of the motor can also be changed by controlling the motor frequency. Among them, the motor frequency and the motor rotation speed are in an inverse relationship.

[0033] In the embodiments of the present invention, the optimal variable-frequency path is the frequency change gradient of the motor working frequency during the operation of the solid-state cartridge refrigeration and heating device, that is, the frequency change gradient of the motor working frequency during the entire stage when the solid-state cartridge refrigeration and heating device warms up or cools down from the ambient temperature to the target temperature and then operates at an energy-saving frequency.

[0034] In one embodiment, when there is a large difference between the ambient temperature and the target temperature, in order to meet the demand and reach the target temperature as soon as possible, the operating frequency of the motor when quickly raising or lowering the ambient temperature to the target temperature is set as the first operating frequency. Then, the motor operates at the energy-saving frequency. At this time, the optimal frequency conversion path of the motor is the first operating frequency - the energy-saving frequency. It should be noted that although rapid temperature rise and fall consume a large amount of energy for the motor, due to the short time of rapid temperature rise and fall and the subsequent operation of the motor at the energy-saving frequency, the overall energy consumption of the motor is the lowest, and the subsequent operation of the motor at the energy-saving frequency can also ensure that the ambient temperature remains at a constant temperature (target temperature) state.

[0035] In another embodiment, when the difference between the ambient temperature and the target temperature is small, on the one hand, for energy conservation, and on the other hand, to keep the ambient temperature at a constant temperature (target temperature) state, the operating frequency of the motor when raising or lowering the ambient temperature to the target temperature is the second operating frequency. Then, the motor operates at the energy-saving frequency. At this time, the optimal frequency conversion path of the motor is the second operating frequency - the energy-saving frequency. In practical applications, the frequency change of the optimal frequency conversion path may change multiple times. The above embodiments are only examples.

[0036] The following gives an example to illustrate the frequency change gradient of the present invention, but it is not a limitation: The target temperature set by the user is 24°C, the current room temperature is 30°C, and the solid-state cartridge unloading stress is in the refrigeration state. At this time, the operating frequency of the variable-frequency motor is adjusted to the highest operating frequency of 100 Hz for rapid refrigeration. After time t, it is gradually reduced to 75 Hz, and after another time t, it is gradually reduced to 55 Hz, and then after another time t, it is gradually reduced to 45 Hz. That is, the frequency of the motor gradually decreases according to a certain gradient, and the reduction amount of each frequency gradient becomes smaller, gradually approaching the operating frequency corresponding to the target temperature, so that the solid-state cartridge refrigeration and heating device gradually changes from the rapid refrigeration mode to the mode of reducing energy consumption.

[0037] In some application scenarios applicable to the embodiments of the present invention, such as user air conditioners, including: household air conditioners, automotive air conditioners, or central air conditioners, etc., maintaining a constant temperature after rapid cooling (refrigeration) or heating (heating) can improve user comfort, and operating at the energy-saving frequency can save the energy consumption of the motor. In some other application scenarios for objects, such as computer room air conditioners, refrigerators, cold storage, refrigerated trucks, data center refrigeration systems, etc., the motor operates at the operating frequency in the optimal frequency conversion path, and can quickly achieve the effect of variable-frequency constant temperature.

[0038] In some embodiments, S120 includes: when the temperature difference between the ambient temperature and the target temperature is greater than a first preset value, taking the shortest temperature adjustment time as the first target and the minimum temperature overshoot as the second target, and using a multi-objective optimization algorithm to optimize and obtain a first optimal frequency conversion path within the interval [a, b], where the temperature adjustment time is the time required to adjust the ambient temperature to the target temperature, the temperature overshoot is the difference exceeding the target temperature during the process of adjusting the ambient temperature to the target temperature, a is the operating frequency corresponding to the target temperature, and b is the maximum operating frequency of the motor.

[0039] In the embodiments of the present invention, when the temperature difference between the ambient temperature and the target temperature is greater than the first preset value, that is, the deviation between the ambient temperature and the target temperature is large. At this time, rapid cooling / heating is performed to adjust to the target temperature, and then the operating frequency of the motor is adjusted to the energy-saving frequency for operation, so as to minimize the overall energy consumption of the motor. Among them, the first preset value can be set according to the actual application scenario.

[0040] In this process, the first stage takes the shortest temperature rise and fall time as the main control target, that is, the first target, which is specifically reflected as the minimum adjustment time. The second stage takes the temperature overshoot as the main control target, that is, the second target. The smaller the overshoot, the less wasted energy, and the lowest energy consumption of the motor during the overall operation of the solid-state elastic card refrigeration and heating device. Among them, the demarcation point between the first stage and the second stage is calculated by a multi-objective optimization algorithm. Due to the different ambient temperatures and target temperatures, the optimal frequency conversion paths adopted each time frequency conversion are different.

[0041] In the embodiments of the present invention, the multi-objective optimization algorithm can be a multi-objective particle swarm algorithm, a multi-objective genetic algorithm, etc., which are not limited herein. If the current operating frequency is not within [a, b], the operating frequency corresponding to the target temperature is used as the initial value of the first optimal frequency conversion path. If the current operating frequency is within [a, b], the current operating frequency is used as the initial value of the first optimal frequency conversion path.

[0042] After determining the initial value, a first time series of operating frequencies is established accordingly, and each value in the series is the initial value. The first value in the series is fixed as the initial value and remains unchanged, and other values are optimized by the multi-objective optimization algorithm. The constraint condition during the optimization process is that the difference between adjacent two values is not greater than the preset difference to ensure the smooth adjustment of the operating frequency.

[0043] Since the refrigeration / heating temperature of the solid-state elastic card refrigeration and heating device depends on the operating frequency. After each iterative optimization, the refrigeration / heating temperature at each subsequent moment is calculated according to the values of the operating frequencies in the time series. Combining the current ambient temperature and the temperature prediction model, the temperature prediction value within the subsequent time can be predicted. Among them, the temperature prediction model can be a neural network model, a support vector machine, etc., which are not limited herein.

[0044] During the process from when the predicted temperature exceeds the target temperature until it callbacks, the exceeded part is the temperature overshoot. The moment from the current time to when the overshoot of the predicted temperature is less than the preset overshoot is defined as the adjustment time.

[0045] After each iteration, the temperature overshoot and the adjustment time can be calculated. Taking the minimization of these two data as the goal, the control curve of the optimal operating frequency can be optimized, which is the above-mentioned first optimal variable frequency path.

[0046] In some embodiments, S120 includes: when the temperature difference between the ambient temperature and the target temperature is not greater than the first preset value and does not reach the preset range where the target temperature is located, using a multi-objective optimization algorithm to optimize the current operating frequency of the motor with the minimum temperature overshoot as the first goal and the maximum energy efficiency ratio as the second goal to obtain the second optimal variable frequency path.

[0047] In the embodiments of the present invention, when the absolute value of the difference between the ambient temperature and the target temperature value is not greater than the first preset value, that is, the deviation between the ambient temperature and the target temperature is small and does not reach the preset range where the target temperature is located, it is necessary to switch from the fast cooling / heating mode to the energy-saving mode, which is specifically reflected in the minimum temperature overshoot. The smaller the overshoot, the closer the ambient temperature is to the target temperature. The minimum energy consumption is the main control goal, which is specifically reflected in the maximum energy efficiency ratio (the ratio of the cooling effect to the power consumption).

[0048] In the embodiments of the present invention, the related calculations of the second optimal variable frequency path are the same as the principle of the above-mentioned first optimal variable frequency path, and the only difference lies in the optimization goals, which will not be described here again. Similarly, the rotational speed value sequence constructed for the initial value is optimized to obtain the second optimal variable frequency path. The constraint condition is that the difference between two adjacent values is not greater than the preset difference to ensure the smooth adjustment of the rotational speed. And after the operating frequency at each calculated moment drops to be less than the operating frequency corresponding to the target temperature, it only needs to maintain the overall downward trend, and it is not necessary for the operating frequency at each subsequent moment to be less than the previous moment. It should be noted that in the first optimal variable frequency path and the second optimal variable frequency path, the solid-state cartridge cooling and heating device operates at the energy-saving frequency after reaching the range where the target temperature is located.

[0049] In some embodiments, S120 includes: when the ambient temperature reaches the preset range where the target temperature is located, taking the energy-saving frequency corresponding to the target temperature as the operating frequency of the motor.

[0050] In an embodiment of the present invention, the preset range where the target temperature is located is a relatively small temperature range. For example, the target temperature is 25 °C, and the preset range is 24.8 - 25.2 °C. When the target temperature fluctuates within the preset range, it can be considered in a constant temperature state. At this time, the energy-saving frequency needs to be used as the operating frequency to minimize the energy consumption of the solid-state cartridge refrigeration and heating device as much as possible.

[0051] It should be noted that the energy-saving frequency is the operating frequency that minimizes the motor energy consumption when the ambient temperature reaches the preset range of the target temperature. Since the ambient temperature is greatly affected by the external environment, the energy-saving frequency can be determined by the target temperature. The specific method includes: aiming at the smallest temperature overshoot, using the operating frequency of the motor running at the target temperature as the initial value, optimizing the operating frequency of the motor at the target temperature by using a single-objective optimization algorithm, and taking the optimized frequency as the energy-saving frequency of the target temperature. In this way, the energy-saving frequency can be dynamically adjusted to ensure that the adjusted temperature remains constant.

[0052] In an embodiment of the present invention, since the external ambient temperature is constantly changing, a fixed operating frequency is not sufficient to strictly maintain the ambient temperature at the target temperature. Therefore, the energy-saving temperature of the present invention also needs to be adjusted in real time. The present invention calculates the temperature overshoot according to the energy-saving frequency, which optimizes the constructed frequency sequence of the initial value to obtain the optimal energy-saving frequency. The constraint condition is that the difference between two adjacent values is not greater than the preset difference to ensure the smooth adjustment of the rotation speed.

[0053] In some embodiments, S120 includes: inputting the target temperature and the ambient temperature into a pre-trained optimal frequency conversion path model to obtain the optimal frequency conversion path of the motor, where the optimal frequency conversion path is the frequency change gradient with the minimum energy consumption when adjusting the ambient temperature to the target temperature.

[0054] In an embodiment of the present invention, the optimal frequency conversion path model can be an unsupervised neural network model, a deep learning model, etc., which is not limited herein.

[0055] Among them, the optimal frequency conversion path model is trained in the following manner:

[0056] Collect the set temperature and the ambient temperature within the historical period, and record the path of the operating frequency of the motor within this historical period. Using the set temperature and the ambient temperature within the historical period as the input and the operating frequency path with the lowest motor energy consumption within this historical period as the output, train the optimal frequency conversion path model.

[0057] In the embodiments of the present invention, the set temperature and ambient temperature in the historical period, and the data related to the working frequency path when the motor energy consumption is the lowest can be classified according to the range of the temperature difference between the set temperature and the ambient temperature in the above embodiments, and then the optimal frequency conversion path model is trained separately, so that when the optimal frequency conversion path model recognizes that the ambient temperature and the target temperature are greater than the preset value, it adjusts to the target temperature in the fastest time according to the output optimal frequency conversion path and then operates at the energy-saving frequency, or when it recognizes that the ambient temperature and the target temperature are not greater than the preset value and not within the preset range of the target temperature, it adjusts to the target temperature for energy-saving purposes according to the output optimal frequency conversion path and then operates at the energy-saving frequency, or when it recognizes that the ambient temperature is within the range of the target temperature, it operates at the energy-saving frequency. It should be noted that the energy-saving frequency in this embodiment is obtained by training the optimal frequency conversion path model using historical data.

[0058] Specifically, an adversarial network can be used as the optimal frequency conversion path model. The adversarial network includes a generator, a discriminator, and an optimizer, and multiple stages of training are required;

[0059] First, the historical path is used as the true value. At the same time, a set of fake samples is randomly generated by the generator. The set of fake samples includes multiple frequency conversion paths showing a downward trend. The discriminator calculates the cross-entropy loss between these frequency conversion paths and the historical path, and backpropagates it to the generator to minimize the loss. The frequency conversion paths recognized as true by the discriminator and the historical path form a path set a. The optimizer calculates the weighted value of the comfort and energy consumption of each path in the path set a (the specific weights can be set) as the score. After sorting according to the score, the first preset number (or preset proportion) of paths are used as the new true value for the next stage of training. After several stages of training, the generator can generate a reasonable and highest-scoring (balancing comfort and energy consumption) frequency conversion path according to the difference between the room temperature and the target temperature, which is used as the optimal frequency conversion path.

[0060] In summary, the beneficial effects of the present invention are as follows:

[0061] 1. Through frequency conversion control, the motor drive system performs closed-loop frequency conversion control for the target temperature. When the ambient temperature (or the target working area temperature) is very close to and reaches the set target temperature value, the motor operates adaptively at a low frequency, which is beneficial to reducing temperature fluctuations, achieving energy conservation, constant temperature comfort, and noise reduction.

[0062] 2. The present invention proposes a method for calculating the rotational speed based on minimizing the adjustment time and overshoot, which can minimize the temperature overshoot problem while achieving fast adjustment.

[0063] 3. The solid-state elastic card refrigeration and heating device of the present invention uses a shape memory alloy that can quickly refrigerate and heat when stress is loaded or unloaded. The refrigeration and heating temperature can be accurately calculated directly based on the force loaded by the motor (calculated from the magnitude of the working frequency), without the need to set a temperature sensor, resulting in lower costs and a simpler control logic.

[0064] The variable-frequency device of the present invention can be a variable-frequency refrigeration and heating device in any specific scenario. For example, air conditioners, vehicle-mounted air conditioners, modular refrigeration and heating units, heating and cooling integrated machines, etc.

[0065] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0066] Figure 2 It is a schematic structural diagram of the variable-frequency control device of the solid-state elastic card refrigeration and heating device provided by the embodiment of the present invention. As Figure 2 shown, in some embodiments, the variable-frequency control device 2 of the solid-state elastic card refrigeration and heating device includes:

[0067] An acquisition module 210 that acquires the current ambient temperature and the target temperature set by the user;

[0068] A determination module 220 that determines the optimal variable-frequency path of the motor in the solid-state elastic card refrigeration and heating device according to the ambient temperature and the target temperature, where the optimal variable-frequency path is the variable-frequency path when the motor energy consumption is the lowest during the operation of the solid-state elastic card refrigeration and heating device;

[0069] A control module 230 that adjusts the working frequency of the motor according to the optimal variable-frequency path to minimize the motor energy consumption during the temperature adjustment process of loading or unloading the elastic card material by the motor.

[0070] Optionally, the determination module 220 is used to, when the temperature difference between the ambient temperature and the target temperature is greater than a first preset value, take the shortest temperature adjustment time as the first target and the minimum temperature overshoot as the second target, and use a multi-objective optimization algorithm to optimize and obtain the first optimal variable-frequency path within the interval [a, b], where the temperature adjustment time is the time required to adjust the ambient temperature to the target temperature, the temperature overshoot is the difference exceeding the target temperature during the process of adjusting the ambient temperature to the target temperature, a is the working frequency corresponding to the target temperature, and b is the highest working frequency of the motor.

[0071] Optionally, a determination module 220 is configured to, when the temperature difference between the ambient temperature and the target temperature is not greater than a first preset value and the target temperature is not reached within a preset range, use a multi-objective optimization algorithm to optimize the current operating frequency of the motor with the minimum temperature overshoot as the first objective and the maximum energy efficiency ratio as the second objective, so as to obtain a second optimal frequency conversion path.

[0072] Optionally, the determination module 220 is configured to, when the ambient temperature reaches the preset range where the target temperature is located, use the energy-saving frequency corresponding to the target temperature as the operating frequency of the motor.

[0073] Optionally, the determination module 220 is configured to use the minimum temperature overshoot as the objective, use the operating frequency of the motor operating at the target temperature as the initial value, use a single-objective optimization algorithm to optimize the operating frequency of the motor at the target temperature, and use the optimized frequency as the energy-saving frequency of the target temperature.

[0074] Optionally, the determination module 220 is configured to input the target temperature and the ambient temperature into a pre-trained optimal frequency conversion path model to obtain the optimal frequency conversion path of the motor.

[0075] Optionally, the frequency conversion control device 2 of the solid-state cartridge refrigeration and heating device further includes a training module, configured to collect the set temperature and the ambient temperature within a historical period, and record the historical path of the operating frequency of the motor within this historical period; use the set temperature and the ambient temperature as inputs and the operating frequency path with the lowest motor energy consumption within this historical period as the output to train the optimal frequency conversion path model.

[0076] The frequency conversion control device of the solid-state cartridge refrigeration and heating device based on machine learning provided in this embodiment can be used to execute the above method embodiments, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0077] Figure 3 It is a schematic structural diagram of a controller provided in an embodiment of the present invention. As Figure 3 shown, a controller 3 provided in an embodiment of the present invention, the controller 3 in this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, it implements the steps in the above-mentioned method embodiments of various solid-state cartridge refrigeration and heating methods based on machine learning, such as Figure 1 the steps shown. Or, when the processor 30 executes the computer program 32, it implements the functions of each module / unit in the above system embodiments, such as Figure 2 the functions of each module shown.

[0078] Exemplarily, the computer program 32 can be divided into one or more modules / units. One or more modules / units are stored in the memory 31 and executed by the processor 30 to implement the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 32 in the controller 3.

[0079] The controller 3 can be a mobile phone, MCU, ECU, industrial computer, etc., which is not limited herein. The controller 3 can include, but is not limited to, the processor 30 and the memory 31. Those skilled in the art can understand that Figure 3 merely examples of the controller 3, which do not constitute a limitation on the controller 3. It can include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the controller can also include input / output devices, network access devices, buses, etc.

[0080] The so-called processor 30 can be a central processing unit (CPU), or can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0081] The memory 31 can be an internal storage unit of the controller 3, such as the hard disk or memory of the controller 3. The memory 31 can also be an external storage device of the controller 3, such as a plug-in hard disk equipped on the controller 3, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 31 can also include both the internal storage unit and the external storage device of the controller 3. The memory 31 is used to store the computer program and other programs and data required by the controller. The memory 31 can also be used to temporarily store the data that has been output or will be output.

[0082] The embodiment of the present invention also provides a variable-frequency device, which includes the solid-state elastic card refrigeration and heating device described in the above embodiments, and can specifically be a household air conditioner, a vehicle air conditioner, a central air conditioner, a computer room air conditioner, a refrigerator, a cold storage, a refrigerated truck, or a data center refrigeration system, etc., which is not specifically limited.

[0083] An embodiment of the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps in the above embodiment of the LLC-based output voltage calibration method are implemented.

[0084] The computer-readable storage medium stores a computer program 32, and the computer program 32 includes program instructions. When the program instructions are executed by a processor 30, all or part of the processes in the above embodiment methods are implemented. It can also be completed by instructing related hardware through the computer program 32. The computer program 32 can be stored in a computer-readable storage medium. When the computer program 32 is executed by the processor 30, the steps of the above various method embodiments can be implemented. Among them, the computer program 32 includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0085] The computer-readable storage medium can be the internal storage unit of the controller in any of the foregoing embodiments, such as the hard disk or memory of the controller. The computer-readable storage medium can also be an external storage device of the controller, such as a plug-in hard disk equipped on the controller, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the computer-readable storage medium can also include both the internal storage unit of the controller and the external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the controller. The computer-readable storage medium can also be used to temporarily store the data that has been output or will be output.

[0086] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0087] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0088] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0090] In the embodiments provided by the present invention, it should be understood that the disclosed device / controller and method can be implemented in other ways. For example, the device / controller embodiments described above are only illustrative. For example, the division of modules or units is only a logical functional division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, in each embodiment of the present invention, each functional unit may be integrated into a processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0093] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A frequency conversion control method for a solid-state cartridge refrigeration and heating device, characterized in that, The solid-state cartridge refrigeration and heating device includes a cartridge material; the variable frequency control method includes: Obtain the current ambient temperature and the target temperature set by the user; According to the ambient temperature and the target temperature, determine the optimal variable frequency path of the motor in the solid-state cartridge refrigeration and heating device, where the optimal variable frequency path is the variable frequency path of the motor when the motor energy consumption is the lowest during the operation of the solid-state cartridge refrigeration and heating device; Adjust the operating frequency of the motor according to the optimal variable frequency path, so that the motor loads or unloads the cartridge material to achieve the lowest energy consumption during the temperature adjustment process; The determining the optimal variable frequency path of the motor in the solid-state cartridge refrigeration and heating device according to the ambient temperature and the target temperature includes: When the temperature difference between the ambient temperature and the target temperature is greater than a first preset value, taking the shortest temperature adjustment time as the first target and the smallest temperature overshoot as the second target, and using a multi-objective optimization algorithm to optimize and obtain a first optimal variable frequency path within the interval [a, b], where the temperature adjustment time is the time required to adjust the ambient temperature to the target temperature, the temperature overshoot is the difference exceeding the target temperature during the process of adjusting the ambient temperature to the target temperature, a is the operating frequency corresponding to the target temperature, and b is the highest operating frequency of the motor; When the temperature difference between the ambient temperature and the target temperature is not greater than the first preset value and has not reached the preset range where the target temperature is located, taking the smallest temperature overshoot as the first target and the largest energy efficiency ratio as the second target, and using a multi-objective optimization algorithm to optimize the current operating frequency of the motor to obtain a second optimal variable frequency path; When the ambient temperature reaches the preset range where the target temperature is located, use the energy-saving frequency corresponding to the target temperature as the operating frequency of the motor.

2. The variable frequency control method of the solid state cartridge refrigeration and heating device according to claim 1, characterized in that, The method for determining the energy-saving frequency includes: Taking the smallest temperature overshoot as the target and the operating frequency of the motor running at the target temperature as the initial value, using a single-objective optimization algorithm to optimize the operating frequency of the motor at the target temperature, and using the optimized frequency as the energy-saving frequency of the target temperature.

3. The variable frequency control method of the solid state elastic card refrigeration and heating device according to claim 1, characterized in that, The determining the optimal variable frequency path of the motor in the solid-state cartridge refrigeration and heating device according to the ambient temperature and the target temperature includes: Input the target temperature and the ambient temperature into a pre-trained optimal variable frequency path model to obtain the optimal variable frequency path of the motor.

4. The variable frequency control method of the solid-state cartridge refrigeration and heating device according to claim 3, characterized in that, The training of the optimal variable frequency path model includes: Collect the set temperature and ambient temperature in the historical period, and record the path of the operating frequency of the motor in the historical period; Use the set temperature and ambient temperature in the historical period as the input and the operating frequency path with the lowest motor energy consumption in the historical period as the output to train the optimal variable frequency path model.

5. A controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the variable frequency control method of the solid-state cartridge refrigeration and heating device according to any one of claims 1 to 4 above.

6. A variable frequency device, characterized in that, It includes a solid-state cartridge refrigeration and heating device that implements the variable frequency control method according to claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of the variable-frequency control method of the solid-state cartridge refrigeration and heating device according to any one of claims 1 to 4 above.

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