Over-temperature protection method for power conversion device, power conversion device, and electronic equipment

Abstract

The present application relates to an over-temperature protection method for a power conversion device, a power conversion device, an electronic device and a computer-readable storage medium. The method comprises: obtaining a temperature value of the power conversion device; determining an over-temperature load reduction curve that matches the temperature value according to the temperature value and a preset temperature range, wherein the over-temperature load reduction curve is determined according to the temperature rise test result of the power conversion device within the temperature range; determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and the target output voltage level of the power conversion device; performing load reduction processing on the initial current reference signal using the load reduction factor to obtain a current reference signal after load reduction; and controlling the output current of the power conversion device according to the current reference signal after load reduction to meet the load reduction requirement corresponding to the temperature value. The present method can accurately reduce the load according to the set over-temperature load reduction curve, and at the same time, the output current waveform after load reduction can maintain a good sinusoidal wave form.

Description

Technical Field

[0001] The present application relates to the technical field of power conversion device control, and in particular to an over-temperature protection method for a power conversion device, a power conversion device, an electronic device, and a computer-readable storage medium. Background Art

[0002] The inverter usually needs to maintain a stable output voltage and output frequency when working, but in a high temperature environment, the circuits or electrical components inside the inverter are easily affected by the temperature and fail. Therefore, a technical means has emerged to reduce the inverter workload by reducing the inverter load and thus reducing the inverter temperature.

[0003] The current mainstream inverter over-temperature load reduction technology is mainly implemented by dynamic power limitation: the following strategy is configured during the inverter design phase, so that when the inverter temperature rises, the maximum output power of the inverter is reduced by a certain percentage, thereby automatically controlling the temperature to drop. However, although the current mainstream inverter over-temperature load reduction technology can effectively solve the inverter failure problem caused by excessive temperature, it also limits the inverter from fully exerting its corresponding load capacity at a specific temperature, and the limited power cannot completely guarantee that the temperature will not rise to the extent that the inverter is damaged, so there is still a certain risk in extreme cases.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0005] In order to solve the above-mentioned problems, an over-temperature protection method for a power conversion device and a power conversion device are provided in an embodiment of the present application to achieve precise load reduction of the power conversion device, while ensuring that the power conversion device is not affected by overtemperature, and fully improving the load capacity of the power conversion device after over-temperature load reduction.

[0006] To this end, one aspect of the present application provides an over-temperature protection method for a power conversion device, the method comprising:

[0007] Acquiring a temperature value of the power conversion device;

[0008] According to the temperature value and a preset temperature range, determining an over-temperature load reduction curve matching the temperature value, wherein the over-temperature load reduction curve is determined according to a temperature rise test result of the power conversion device within the temperature range;

[0009] Determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve, and the target output voltage level of the power conversion device;

[0010] The load reduction factor is used to perform load reduction processing on the initial current reference signal to obtain a current reference signal after load reduction;

[0011] The output current of the power conversion device is controlled according to the current reference signal after load reduction to meet the load reduction demand corresponding to the temperature value.

[0012] The over-temperature protection method of the above-mentioned power conversion device determines the currently matched over-temperature load reduction curve by utilizing the temperature value of the power conversion device and the preset temperature range, determines the load reduction factor of the initial current reference signal according to the temperature value, the target output voltage level and the over-temperature load reduction curve, and then uses the current reference signal after limiting based on the load reduction factor to control the output current of the power conversion device, so that the power conversion device after load reduction meets the load reduction demand corresponding to the temperature value, and realizes the power conversion device to accurately reduce the load according to the set over-temperature load reduction curve, while ensuring that the power conversion device is not affected by overtemperature, and fully improves the load-carrying capacity of the power conversion device after over-temperature load reduction.

[0013] Another aspect of the present application provides a power conversion device, comprising:

[0014] A power conversion module, used to convert input power into output power in different forms;

[0015] A temperature sampling module, used to obtain the temperature value of the power conversion device;

[0016] Control module, including:

[0017] a load reduction unit, configured to determine an over-temperature load reduction curve matching the temperature value according to the temperature value and a preset temperature range, and determine a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and a target output voltage level of the power conversion device, wherein the over-temperature load reduction curve is determined according to a temperature rise test result of the power conversion device within the temperature range;

[0018] a current multiplication unit, configured to perform load reduction processing on the initial current reference signal by using the load reduction factor to obtain a current reference signal after load reduction;

[0019] A current loop control unit is used to control the output current of the power conversion device according to the current reference signal after the load reduction to meet the load reduction demand corresponding to the temperature value.

[0020] Another aspect of the present application provides a power conversion device, comprising: a power conversion module and a control module, wherein the control module is configured to execute the steps of the over-temperature protection method for the power conversion device as described in any of the above aspects.

[0021] In another aspect of the present application, there is also provided an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the over-temperature protection method for the power conversion device described in any of the above aspects are implemented.

[0022] In another aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the over-temperature protection method for the power conversion device described in any of the above aspects are implemented.

[0023] In another aspect of the present application, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the over-temperature protection method for a power conversion device described in any of the above aspects.

[0024] The above summary is provided to introduce some concepts in a simplified form, which will be further described in detail in the following detailed description. The above summary is neither intended to identify the key features or essential features of the claimed subject matter nor to be used to help determine the scope of the claimed subject matter. The claimed subject matter of the application is not limited to implementations that solve any or all of the disadvantages pointed out in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments.

[0026] Figure 1 A schematic diagram of the hardware structure of a power conversion device for implementing each embodiment of the present application;

[0027] Figure 2 A schematic flow chart of an over-temperature protection method for a power conversion device in one embodiment;

[0028] Figure 3 A schematic flow chart of the steps of generating an over-temperature load reduction curve in one embodiment;

[0029] Figure 4 A schematic diagram of an over-temperature load reduction curve provided in an embodiment of the present application;

[0030] Figure 5A schematic diagram of an over-temperature load reduction curve in a temperature range of [40°, 45°] provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of an over-temperature load reduction curve in a temperature range of [45°, 60°] provided in an embodiment of the present application;

[0032] Figure 7 A schematic diagram of a flow chart of a load shedding factor determination step provided in an embodiment of the present application;

[0033] Figure 8 A schematic flow chart of an over-temperature protection method for a power conversion device in another embodiment;

[0034] Fig. 9 A schematic diagram of temperature change in a temperature range of [40°, 45°] provided in an embodiment of the present application;

[0035] Fig.10 A load reduction factor curve diagram in the temperature range [40°, 45°] provided in an embodiment of the present application;

[0036] Fig.11 A schematic diagram of a power curve in an ideal load reduction scenario and a real load reduction scenario in a temperature range of [40°, 45°] provided in an embodiment of the present application;

[0037] Fig.12 A waveform diagram of the output current before and after load reduction in the temperature range [40°, 45°] provided in an embodiment of the present application;

[0038] Fig.13 A schematic diagram of temperature change in a temperature range of [45°, 60°] provided in an embodiment of the present application;

[0039] Fig.14 A load reduction factor curve diagram in the temperature range [45°, 60°] provided in an embodiment of the present application;

[0040] Fig.15 A schematic diagram of a power curve in an ideal load reduction scenario and a real load reduction scenario in a temperature range of [45°, 60°] provided in an embodiment of the present application;

[0041] Fig.16 A waveform diagram of the output current before and after load reduction in a temperature range of [45°, 60°] provided in an embodiment of the present application;

[0042] Fig.17 A control loop block diagram of a control module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0045] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds and / or groups. The terms "or", "and / or", "including at least one of the following" etc. used in this application can be interpreted as inclusive, or mean any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0046] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0047] As used herein, the words “if” and “if” may be interpreted as “at the time of” or “when” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrases “if it is determined” or “if (stated condition or event) is detected” may be interpreted as “when it is determined” or “in response to determining” or “when detecting (stated condition or event)” or “in response to detecting (stated condition or event),” depending on the context.

[0048] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] See also Figure 1 , shows a hardware structure diagram of a power conversion device 100 provided in the present application, including a power conversion module 102 and a control module 104.

[0050] Among them, the power conversion module 102 includes a power conversion topology for converting input power into different forms of output power. The power conversion device 100 may include but is not limited to any of a variety of devices such as an AC-DC converter, a DC-AC converter, a DC-DC converter or an AC-AC converter. In different power conversion devices, the role of the power conversion topology may also be different accordingly, such as voltage transformation, inversion, rectification, frequency conversion, etc. The power conversion topology may include semiconductor power devices, such as insulated gate bipolar transistors IGBT, metal-oxide semiconductor field effect transistors MOSFET, etc.

[0051] Exemplarily, the power conversion module 102 may be an inverter module, which receives a DC input current and converts it into an AC output current with a certain voltage and frequency after being inverted by the power conversion module 102, thereby supplying power to an AC load.

[0052] The control module 104 is coupled to the power conversion module 102 and is used to control the performance parameters of the output power of the power conversion module 102 according to the set control strategy, such as voltage, current, frequency, etc. For example, the control module 104 can couple the output control signal to each semiconductor power device of the power conversion module 102, and change the performance parameters of the output power of the power conversion module 102 by changing the switching cycle or frequency of the semiconductor power device.

[0053] Optionally, in some embodiments, the control module 104 may include but is not limited to a variety of functional units such as a voltage loop control unit, a limiting unit, a current loop control unit, and a current multiplication unit. In the specific implementation process, the units that implement the corresponding functions can be integrated in other functional modules or control circuits, which will not be repeated below. The control module 104 can form a double closed-loop control loop through the voltage loop control unit, the limiting unit, the current loop control unit and other functional units connected in sequence, thereby generating a corresponding control signal to control the power conversion module 102. Among them, the voltage loop control unit is used to feedback-regulate the output voltage of the power conversion device by positive feedback or negative feedback to improve the stability of the voltage, the current loop control unit is used to feedback-regulate the output current of the power conversion device by positive feedback or negative feedback to improve the stability of the current, and the limiting unit is used to limit the reference current signal of the current loop control unit to achieve the control purpose of changing the output performance of the power conversion device.

[0054] Furthermore, the control module 104 is also configured to execute the over-temperature protection method for the power conversion device provided in the present application.

[0055] In one embodiment, if Figure 2 As shown, a method for over-temperature protection of a power conversion device is provided, comprising:

[0056] Step S202, obtaining the temperature value of the power conversion device.

[0057] The temperature value may include but is not limited to any one or more of various temperature data such as the temperature value of the environment in which the power conversion device is located, the temperature value of the power device in the power conversion device, or the temperature value of the heat dissipation element of the power device in the power conversion device.

[0058] Specifically, a temperature sensor is provided in the power conversion device 100, and a temperature detection signal at the corresponding position of the power conversion device 100 is generated by arranging the temperature sensor. The control module 104 can obtain the temperature detection signal from the temperature sensor and convert the temperature detection signal into a corresponding temperature value. Preferably, the temperature sensor can obtain the ambient temperature value of the environment in which the power conversion device 100 is located, and use the ambient temperature value as the temperature value of the power conversion device 100 in step S202.

[0059] Step S204: determining an over-temperature load reduction curve matching the temperature value according to the temperature value and a preset temperature range.

[0060] The over-temperature load reduction curve may be determined according to the temperature rise test result of the power conversion device 100 within the temperature range. The number of the temperature ranges may be one or more.

[0061] The temperature rise test result is used to indicate the critical value of the power conversion device 100 related to the over-temperature state in the temperature rise test, and may include but is not limited to any one or more of the parameter values ​​such as critical load power, critical output current or critical output voltage.

[0062] Specifically, the control module 104 may store a preset temperature interval and an over-temperature load reduction curve corresponding to the temperature interval. Each sampling point on the over-temperature load reduction curve is used to identify the load reduction requirement of the power conversion device 100 at the corresponding temperature value. The power conversion device 100 may match the currently detected temperature value with the preset temperature interval through the control module 104. Then, when it is determined that the temperature value matches the temperature interval, the over-temperature load reduction curve corresponding to the temperature interval is selected as the over-temperature load reduction curve matching the currently detected temperature value.

[0063] Optionally, in some implementations, the temperature rise test is specifically implemented as follows:

[0064] The power conversion device 100 is set in a temperature rise test environment where the ambient temperature is the lower limit of the temperature interval (that is, the lowest temperature value in the temperature interval), the load power of the power conversion device 100 is gradually increased, and the real-time temperature value of the key over-temperature point of the power conversion device 100 (such as the temperature monitoring point where the insulated gate bipolar transistor IGBT, the metal-oxide semiconductor field effect transistor MOSFET or the heat sink is located) after the power is increased is collected. When it is detected that the real-time temperature value reaches the preset temperature threshold, that is, when the key over-temperature point of the power conversion device 100 is in an over-temperature state, the load power of the power conversion device 100 is reduced, and the actual temperature value of the key over-temperature point is continuously detected until it is determined that all key over-temperature points are not in an over-temperature state. At this time, any one or more of the power parameter values ​​such as the load power, output current or output voltage of the power conversion device 100 is read as the critical load power, critical output current or critical output voltage of the power conversion device 100 at the lower limit of the temperature interval, thereby obtaining the temperature rise test result in the temperature interval. The temperature rise test result shows that the operating parameters of the power conversion device 100 when operating at the current tested temperature value must not exceed the measured critical power parameter value, otherwise there may be a risk of equipment damage.

[0065] Furthermore, if the load power of the power conversion device 100 increases to the rated load power, and the temperature values ​​of all its key over-temperature points still do not reach the preset temperature threshold, it can be determined that the power conversion device 100 can reach the full load state at the lower limit of the temperature range. Then, the ambient temperature value of the power conversion device 100 is increased within the temperature range, and the above-mentioned operation of gradually increasing the load power of the power conversion device 100 is repeated to perform a temperature rise test on the next temperature value until each temperature value within the temperature range is tested, and the temperature rise test result of the power conversion device 100 within the temperature range is obtained.

[0066] Step S206, determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve, and the target output voltage level of the power conversion device.

[0067] The load reduction factor may represent the current limiting ratio of the initial current reference signal of the power conversion device 100, and its value is [0,1]. It can be understood that when the load reduction factor is closer to 1, the current limiting effect of the load reduction factor on the initial current reference signal is weaker. When the load reduction factor is 1, it indicates that the power conversion device can run at full load. When the load reduction factor is closer to 0, the current limiting effect of the load reduction factor on the initial current reference signal is stronger. When the load reduction factor is 0, it indicates that the power conversion device is not running.

[0068] The target output voltage level may represent the effective value of the output voltage of the power conversion device 100. For example, taking the power conversion device 100 as a common inverter, the target output voltage level may be 110V, 120V, 220V or 240V, etc. Generally speaking, when the application scenario of the power conversion device 100 is determined, its target output voltage level is also determined accordingly, so when designing the power conversion device 100, the target output voltage level may be preset in the control module 104.

[0069] Specifically, the power conversion device 100 can determine the load reduction requirement of the power conversion device 100 at the current temperature value according to the currently detected temperature value and the matching over-temperature load reduction curve through the control module 104. Furthermore, based on the target output voltage level and load reduction requirement of the power conversion device 100, the load reduction factor at the current temperature value can be calculated.

[0070] Step S208 , using the load reduction factor to perform load reduction processing on the initial current reference signal to obtain a current reference signal after load reduction.

[0071] The initial current reference signal may represent a reference signal for controlling current in the power conversion device 100. Optionally, when a current loop control unit is provided in the power conversion device 100, the initial current reference signal may also represent an input signal of the current loop control unit.

[0072] Specifically, the power conversion device 100 can obtain an initial current reference signal through the control module 104, and use a load reduction factor to perform load reduction processing on the initial current reference signal in a limiting manner, thereby obtaining a current reference signal after load reduction.

[0073] Optionally, when a dual closed-loop control loop consisting of a voltage loop control unit and a current loop control unit is deployed in the power conversion device 100, the output of the voltage loop control unit can be used as the input of the current loop control unit, that is, the initial current reference signal.

[0074] Optionally, in other embodiments, when a limiting unit is deployed in the control module 104, the initial current reference signal can be input into the limiting unit through the voltage loop control unit of the control module 104, and the initial current reference signal can be limited to a preset range within the limiting unit using a load reduction factor, and then the limited current reference signal is output to the current loop control unit.

[0075] Alternatively, in other embodiments, a current multiplication unit is deployed in the control module 104, and the initial current reference signal can be input into the current multiplication unit through the voltage loop control unit of the control module 104, and the initial current reference signal can be limited to a preset range within the current multiplication unit using a load reduction factor, and then the limited current reference signal is output to the current loop control unit.

[0076] Step S210 , controlling the output current of the power conversion device according to the current reference signal after load shedding to meet the load shedding requirement corresponding to the temperature value.

[0077] Specifically, the power conversion device 100 may be provided with a current sampling unit to obtain the actual output current of the current power conversion device 100. Taking the power conversion device 100 as an inverter as an example, the actual output current may be the inductor current value of the inverter. The power conversion device 100 may determine the current error value between the current reference signal after load reduction and the actual output current through the control module 104. Based on the current error value, a PI adjustment method (a linear adjustment method for controlling the controlled object by forming a control deviation based on a given value and an actual output value, and forming a control amount by linearly combining the proportion and integral of the deviation) is adopted to generate a corresponding current control signal to the power conversion module 102 to control the output current of the power conversion device 100 to reduce, thereby reducing the output power of the power conversion device 100 and meeting the load reduction requirement corresponding to the temperature value.

[0078] The over-temperature protection method of the power conversion device described above determines the currently matched over-temperature load reduction curve by using the temperature value of the power conversion device and the preset temperature range, determines the load reduction factor of the initial current reference signal according to the temperature value, the target output voltage level and the over-temperature load reduction curve, and then uses the current reference signal after limiting based on the load reduction factor to control the output current of the power conversion device, so that the power conversion device after load reduction meets the load reduction demand corresponding to the temperature value, and realizes that the power conversion device is accurately reduced according to the set over-temperature load reduction curve, while ensuring that the power conversion device is not affected by over-temperature, and fully improves the load-carrying capacity of the power conversion device after over-temperature load reduction. At the same time, the current reference signal after load reduction does not adopt the clipping method, so that the output current waveform after load reduction can maintain a good sine wave form, and improve the THD value (Total Harmonic Distortion) of the power conversion device after load reduction.

[0079] In one embodiment, Figure 3 As shown, a method for generating an over-temperature load reduction curve is provided, including:

[0080] Step S302: determining a preset load reduction requirement according to the critical load power of the power conversion device at different temperature values.

[0081] The critical load power is the maximum load power of the power conversion device that meets the temperature rise test at a certain temperature value.

[0082] Specifically, through the temperature rise test implementation method described above, the critical load power of the power conversion device at different temperature values ​​can be determined. The critical load power at different temperature values ​​is used as the target output power of the power conversion device after load reduction at the corresponding temperature value, and the preset load reduction requirements of the power conversion device at different temperature values ​​can be obtained. Figure 4 Taking the schematic diagram of the over-temperature load reduction curve shown as an example, the actual temperature rise experiment load reduction demand curve is a curve obtained by fitting the critical load power measured by the power conversion device at multiple different temperature values.

[0083] Step S304: determining a plurality of preset temperature intervals according to a change in a critical load power corresponding to a preset load reduction requirement.

[0084] Among them, the change can represent the difference in critical load power at different temperature values. Specifically, the critical load power at adjacent temperature values ​​corresponding to the preset load reduction demand can be calculated by subtracting the difference to determine the change in the critical load power corresponding to the preset load reduction demand. When the change in the critical load power changes, for example, when the difference between the critical load powers decreases or increases, the temperature value corresponding to this time is used as the dividing line, and the temperature value on the left side of the dividing line is divided into one temperature interval, and the temperature value on the right side of the dividing line is divided into another temperature interval, thereby determining multiple preset temperature intervals.

[0085] Alternatively, the change situation may also represent the change trend of the critical load power in different temperature intervals. Specifically, different temperature intervals may be divided according to the difference in the slope of the critical load power curve.

[0086] Step S306: generating an over-temperature load reduction curve corresponding to each preset temperature interval according to the critical load power in each preset temperature interval.

[0087] Specifically, the critical load power of the power conversion device in each preset temperature interval can be selected as the target output power of the power conversion device after load reduction in each preset temperature interval, and a mapping relationship between the target output power and the temperature value is established, thereby generating an over-temperature load reduction curve corresponding to each preset temperature interval. The over-temperature load reduction curve corresponding to each temperature interval is different.

[0088] Alternatively, in order to further improve the reliability of the power conversion device, the critical load power in each preset temperature range can be reduced by a preset percentage to generate a corresponding over-temperature load reduction curve, thereby avoiding possible overload caused by deviations between the temperature rise test results and the actual operation process.

[0089] In this embodiment, by obtaining the critical load power of the power conversion device at different temperature values ​​in the actual temperature difference test, a plurality of preset temperature intervals are determined based on the change of the critical load power, and then an over-temperature load reduction curve corresponding to each preset temperature interval is generated. The over-temperature load reduction curve can accurately fit the load reduction requirements of the power conversion device at different temperature values, thereby helping to improve the subsequent load reduction accuracy of the power conversion device based on the over-temperature load reduction curve.

[0090] In an example, Figure 4 As shown in FIG. 1 , a schematic diagram of a load reduction curve of a power conversion device 100 is provided. Figure 4 It can be seen that the actual temperature rise experimental load reduction demand curve obtained by the power conversion device 100 in the actual temperature rise test is nonlinear, and its expression is difficult to calculate accurately.

[0091] Therefore, in order to maximize the load capacity of the power conversion device, the load reduction demand curve of the actual temperature rise experiment can be divided into temperature intervals, and the nonlinear load reduction demand that is difficult to calculate can be converted into a linear load reduction demand that can be calculated. Furthermore, the linear load reduction demand can be linear in the entire temperature interval, that is, one temperature interval corresponds to a linear over-temperature load reduction curve (see Figure 4 The load reduction curve design in 1) can also be different temperature ranges corresponding to different linear over-temperature load reduction curves to form segmented load reduction intervals (see Figure 4 Design of load reduction curve in 2).

[0092] Therefore, the above step S306, generating an over-temperature load reduction curve corresponding to each preset temperature interval according to the critical load power in each preset temperature interval, may include: fitting a linear over-temperature load reduction curve corresponding to each preset temperature interval according to the critical load power change trend in each preset temperature interval. The specific implementation method is as follows:

[0093] According to the temperature value difference in each preset temperature interval (that is, the difference between the maximum temperature value and the minimum temperature value in the temperature interval), and the critical power difference (that is, the difference between the maximum critical load power and the minimum critical load power in the temperature interval), the critical load power change trend of the power conversion device in each preset temperature interval is determined. The critical load power change trend in each preset temperature interval is fitted by linear fitting, so as to fit the linear over-temperature load reduction curve corresponding to each preset temperature interval.

[0094] In this embodiment, by fitting a linear over-temperature load reduction curve corresponding to each preset temperature interval according to a critical load power variation trend within each preset temperature interval, the calculation accuracy and efficiency of the over-temperature load reduction curve can be improved.

[0095] Optionally, in one embodiment, step S204, determining an over-temperature load reduction curve matching the temperature value according to the temperature value and a preset temperature range, is specifically implemented as follows:

[0096] A target temperature interval to which the temperature value belongs is determined from a plurality of preset temperature intervals, and an over-temperature load reduction curve corresponding to the target temperature interval is used as an over-temperature load reduction curve matching the temperature value.

[0097] Optionally, in some implementations, a linear over-temperature load reduction curve within a certain temperature range may be obtained by fitting with reference to the following formula:

[0098] W = Xb(Temp-T1);

[0099] Wherein, W is the target output power of the power conversion device after load reduction (i.e., load reduction requirement); X is the rated load power of the power conversion device; b is the load reduction requirement of the power conversion device within the temperature range, for example, the output power value that needs to be reduced when the power conversion device rises by one degree; Temp is the ambient temperature measured by the power conversion device, which is regarded as the temperature value of the power conversion device in this embodiment; T1 is the lower limit of the temperature range.

[0100] For a power conversion device with a rated load power of 4000 watts, its load reduction requirement in the temperature range [40°, 45°] is assumed to be 200 watts of output power for every 1° increase in temperature, and the load reduction requirement in the temperature range [45°, 60°] is 60 watts of output power for every 1° increase in temperature. Thus, we can get the following fitting result: Figure 5 The over-temperature load reduction curve of the power conversion device in the temperature range [40°, 45°] as shown in FIG. Figure 6 The over-temperature load reduction curve of the power conversion device shown in the temperature range [45°, 60°].

[0101] against Figure 5 The overtemperature derating curve shown in:

[0102] When the temperature value Temp=44°, Figure 5 As shown in FIG. 1 , the target output power of the power conversion device needs to be reduced from 4000 watts to 3200 watts. The over-temperature reduction curve of the power conversion device at this temperature value can be expressed by the following formula:

[0103] W = (-200*Temp) + 12000;

[0104] Wherein, W is the target output power of the power conversion device at this temperature value, and Temp is the ambient temperature measured by the power conversion device.

[0105] against Figure 6 The overtemperature derating curve shown in:

[0106] When the temperature is Temp=50°, Figure 6 As shown in FIG. 1 , the target output power of the power conversion device needs to be reduced from 4000 watts to 2700 watts. The over-temperature reduction curve of the power conversion device at this temperature value can be expressed by the following formula:

[0107] W = (-60*Temp) + 5700;

[0108] Wherein, W is the target output power of the power conversion device at this temperature value, and Temp is the ambient temperature measured by the power conversion device.

[0109] In one embodiment, if Figure 7 As shown, step S206, determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and the target output voltage level of the power conversion device, includes:

[0110] Step S702: determining a target output power corresponding to the temperature value according to the temperature value and the over-temperature load reduction curve.

[0111] Specifically, as can be seen from the calculation formula of the overtemperature load reduction curve mentioned above, the target output power of the power conversion device under the load reduction requirement corresponding to the temperature value can be determined by using the temperature value of the power conversion device and the overtemperature load reduction curve matching the temperature value.

[0112] Step S704, determining a reference current effective value according to the target output power and the target output voltage level.

[0113] The reference current effective value may represent an effective value of a current reference signal that satisfies a load reduction requirement corresponding to a current temperature value.

[0114] Specifically, the power conversion device can use the control module to perform calculations on the target output power and the target output voltage level determined in step S702 by dividing them and taking the quotient, and use the quotient of the target output power and the target output voltage level as the reference current effective value.

[0115] Optionally, the reference current effective value may be determined by referring to the following formula:

[0116]

[0117] Among them, I inv_ref_rms represents the reference current effective value, W represents the target output power, V rms Indicates the target output voltage level.

[0118] Step S706, determining a load reduction factor according to the reference current effective value and the actual inductor current effective value of the power conversion device.

[0119] Specifically, the power conversion device can obtain the actual inductor current value of the power conversion device through the current sampling unit, and then determine the actual inductor current effective value according to the actual inductor current value. The control module performs calculation processing on the reference current effective value determined in step S704 and the actual inductor current effective value by dividing and obtaining the quotient, and uses the quotient of the reference current effective value and the actual inductor current effective value as the load reduction factor.

[0120] Optionally, the load reduction factor may be determined by referring to the following formula:

[0121]

[0122] Among them, K ref is the load reduction factor, I inv_ref_rms is the effective value of the reference current, I inv_rms is the actual effective value of the inductor current.

[0123] again

[0124] Therefore, we can find:

[0125]

[0126] Among them, K ref is the load reduction factor, W represents the target output power, V rms Indicates the target output voltage level, I inv_rms is the actual effective value of the inductor current.

[0127] In this embodiment, the target output power at the temperature value is determined by the temperature value and the over-temperature load reduction curve, the target output power and the target output voltage level are used to determine the reference current effective value that meets the load reduction demand corresponding to the current temperature value, and the reference current effective value and the actual inductor current effective value are used to calculate the load reduction factor, so as to achieve accurate tracking of the over-temperature load reduction curve and strictly follow the load reduction demand for the power conversion device according to the over-temperature load reduction curve.

[0128] In one embodiment, in step S208, before the initial current reference signal is subjected to load reduction processing using a load reduction factor to obtain the current reference signal after load reduction, the method may also include: obtaining the output voltage value of the power conversion device; and generating the initial current reference signal based on the output voltage value and a preset voltage reference signal.

[0129] Specifically, a voltage sampling unit may be provided in the power conversion device to obtain the output voltage value of the power conversion device. Taking the inverter as an example, the output voltage value may be the inductance voltage value of the inverter. The power conversion device may parse the voltage detection signal of the voltage sampling unit through the control module to obtain the corresponding output voltage value, determine the voltage error value between the output voltage value and the preset voltage reference signal, and perform PI adjustment on the voltage error value to obtain the initial current reference signal.

[0130] In one embodiment, Figure 8 As shown, there is also provided an application Figure 1 The over-temperature protection method of the power conversion device 100 includes:

[0131] Step S802, obtaining the temperature value of the power conversion device.

[0132] Step S804: determining a target temperature interval to which the temperature value belongs from a plurality of preset temperature intervals, and using an over-temperature derating curve corresponding to the target temperature interval as an over-temperature derating curve matching the temperature value.

[0133] Step S806, generating an initial current reference signal according to the output voltage value of the power conversion device and a preset voltage reference signal.

[0134] Step S808, determining a reference current effective value according to the target output power corresponding to the temperature value in the over-temperature load reduction curve and the target output voltage level, and determining a load reduction factor according to the reference current effective value and the actual inductor current effective value.

[0135] Step S810, using a load reduction factor to perform load reduction processing on the initial current reference signal to obtain a current reference signal after load reduction.

[0136] Step S812, controlling the output current of the power conversion device according to the current reference signal after load shedding to meet the load shedding requirement corresponding to the temperature value.

[0137] As an example, Fig. 9 As shown, a temperature variation curve of a power conversion device 100 in a temperature range of [40°, 45°] is provided. The rated load power of the power conversion device 100 is 4000 watts, and the target output voltage level is 120 volts. The load reduction requirement of the power conversion device 100 in the temperature range of [40°, 45°] is: 200 watts are reduced for every 1° increase. Therefore, the current reference signal of the power conversion device 100 after load reduction in the temperature range of [40°, 45°] is

[0138] based on Fig. 9 The temperature change curve in the embodiment can be obtained by referring to the load reduction factor determination method provided in the above embodiment. Fig.10 The derating factors in the temperature range [40°, 45°] are shown in Curve. Fig.10 The load reduction factor in Fig.11 The power curve without load reduction shown in FIG is subjected to load reduction processing, and the following can be obtained: Fig.11 The actual load reduction target output power curve is shown in .

[0139] from Fig.11 It can be seen that the actual load reduction target output power curve obtained based on the load reduction factor can accurately follow the load reduction curve W designed for the power conversion device 100 in the temperature range [40°, 45°], thereby achieving accurate load reduction of the power conversion device 100 according to the load reduction curve W, so that the power conversion device 100 after load reduction can still maximize its own load capacity at different temperature values.

[0140] like Fig.12 FIG. 1 shows the current waveform of the power conversion device 100 before and after the load reduction according to the load reduction means provided in the above embodiment. Fig.12 It can be seen that the over-temperature protection method provided in the present application can reduce the current without clipping, so as to ensure that the current after load reduction maintains a THD value (Total Harmonic Distortion) with a good waveform.

[0141] In another example, Fig.13As shown, a temperature variation curve of a power conversion device 100 in the temperature range [45°, 60°] is shown. The rated load power of the power conversion device 100 is 4000 watts, and the target output voltage level is 120 volts. The load reduction requirement of the power conversion device 100 in the temperature range [45°, 60°] is: 60 watts are reduced for every 1° increase. Therefore, the current reference signal of the power conversion device 100 after load reduction in the temperature range [45°, 60°] is

[0142] based on Fig.13 The temperature change curve in the embodiment can be obtained by referring to the load reduction factor determination method provided in the above embodiment. Fig.14 The derating factors in the temperature range [45°, 60°] are shown in Curve. Fig.14 The load reduction factor in Fig.15 The output power curve without load reduction shown in FIG is subjected to load reduction processing, and the following can be obtained: Fig.15 The actual load reduction target output power curve is shown in .

[0143] from Fig.15 It can be seen that the actual load reduction target output power curve obtained based on the load reduction factor can accurately follow the load reduction curve w designed for the power conversion device 100 in the temperature range [45°, 60°], thereby achieving accurate load reduction of the power conversion device 100 according to the load reduction curve w, so that the power conversion device 100 after load reduction can still maximize its own load capacity at different temperature values.

[0144] like Fig.16 FIG. 1 shows the current waveform of the power conversion device 100 before and after the load reduction according to the load reduction means provided in the above embodiment. Fig.16 It can be seen that when the over-temperature protection method provided in the present application is adopted, the current can be reduced without clipping to ensure that the current after load reduction maintains a THD value (Total Harmonic Distortion) with a good waveform.

[0145] In this embodiment, by adopting the above-mentioned implementation method, the power conversion device can realize accurate linear load reduction based on the temperature value and the over-temperature load reduction curve matching the temperature value, which can not only reduce the load in a non-clipped manner, but also keep a good THD value (Total Harmonic Distortion) of the current waveform after load reduction. At the same time, it can also avoid the safety hazards caused by the over-temperature operation of the power conversion device and maximize the use of the load capacity of the power conversion device. In addition, it can also be applicable to different models of power conversion devices, and has strong versatility.

[0146] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the indications of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0147] Based on the same inventive concept, the embodiment of the present application also provides a power conversion device for implementing the over-temperature protection method of the power conversion device involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more power conversion device embodiments provided below can refer to the limitations of the over-temperature protection method of the power conversion device above, and will not be repeated here.

[0148] In one embodiment, there is also provided a power conversion device, comprising: a power conversion module, for converting input power into output power in different forms;

[0149] A temperature sampling module is used to obtain the temperature value of the power conversion device;

[0150] Control module, including:

[0151] A load reduction unit, used to determine an over-temperature load reduction curve matching the temperature value according to the temperature value and a preset temperature range, and to determine a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and a target output voltage level of the power conversion device, wherein the over-temperature load reduction curve is determined according to a temperature rise test result of the power conversion device within the temperature range;

[0152] A current multiplication unit, used for performing load reduction processing on the initial current reference signal by using a load reduction factor to obtain a current reference signal after load reduction;

[0153] The current loop control unit is used to control the output current of the power conversion device according to the current reference signal after load reduction to meet the load reduction demand corresponding to the temperature value.

[0154] Optionally, in combination with any of the above embodiments, in another implementation of the present application, the over-temperature load reduction curve is preset in the load reduction unit, and the over-temperature load reduction curve is generated in a manner including:

[0155] Determine the preset load reduction requirement according to the critical load power of the power conversion device at different temperature values, wherein the critical load power is the maximum load power of the power conversion device that meets the temperature rise test at a certain temperature value;

[0156] Determine a plurality of preset temperature ranges according to a change in critical load power corresponding to a preset load reduction demand;

[0157] According to the critical load power in each preset temperature range, an over-temperature load reduction curve corresponding to each preset temperature range is generated.

[0158] Optionally, in combination with any of the above embodiments, in another implementation of the present application, an over-temperature load reduction curve corresponding to each preset temperature interval is generated according to the critical load power in each preset temperature interval, including:

[0159] According to the critical load power variation trend in each preset temperature range, a linear over-temperature load reduction curve corresponding to each preset temperature range is fitted.

[0160] Optionally, in combination with any of the above embodiments, in another implementation of the present application, the load reduction unit is further used to:

[0161] A target temperature interval to which the temperature value belongs is determined from a plurality of preset temperature intervals, and an over-temperature load reduction curve corresponding to the target temperature interval is used as an over-temperature load reduction curve matching the temperature value.

[0162] Optionally, in combination with any of the above embodiments, in another implementation of the present application, the control module further includes:

[0163] The voltage loop control unit is used to obtain the output voltage value of the power conversion device and generate an initial current reference signal according to the output voltage value and a preset voltage reference signal.

[0164] Optionally, in combination with any of the above embodiments, in another implementation of the present application, the load reduction unit is used to determine the corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and the target output voltage level of the power conversion device, including:

[0165] According to the temperature value and the over-temperature load reduction curve, determine the target output power corresponding to the temperature value;

[0166] Determine the reference current effective value according to the target output power and the target output voltage level;

[0167] The load reduction factor is determined according to the reference current effective value and the actual inductor current effective value of the power conversion device.

[0168] Optionally, in combination with any of the above embodiments, in another implementation of the present application, a double closed-loop control circuit consisting of a voltage outer loop and a current inner loop may be used in the power conversion device. Fig.17 As shown, the control module may include a load reduction unit 1702, a voltage loop control unit 1704, a current multiplication unit 1706, and a current loop control unit 1708. The temperature value Temp and the target output voltage level V of the power conversion device are obtained through the load reduction unit 1702. rms , based on the over-temperature load reduction curve matching the temperature value Temp, the target output power at the temperature value Temp is determined, and the target output power and the target output voltage level V rms The reference current effective value can be determined. Using the reference current effective value and the actual inductor current I inv The load reduction factor K can be determined ref The output voltage value V of the power conversion device is obtained by the voltage loop control unit 1704. inv And the voltage reference signal V ref , generating the initial current reference signal I inv_ref And output to the current multiplication unit 1706. The load reduction factor K is adopted by the current unit 1706 ref The initial current reference signal is subjected to load reduction processing to obtain a current reference signal after load reduction. The actual inductor current I is determined by the current loop control unit 1708 inv The deviation from the current reference signal after load reduction, and the current control signal D generated based on the deviation out To control the output current of the power conversion device to meet the load reduction demand corresponding to the temperature value Temp.

[0169] Each module in the above-mentioned power conversion device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module above.

[0170] Those skilled in the art will understand that Fig.17 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0171] As another aspect of the present application, a power conversion device is also provided, comprising: a power conversion module and a control module, wherein the control module is configured to execute the steps of the over-temperature protection method for the power conversion device as described in any of the above aspects. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more power conversion device embodiments provided below can refer to the limitations of the over-temperature protection method for the power conversion device above, and will not be repeated here.

[0172] In one embodiment, a single-chip microcomputer is provided. The single-chip microcomputer may include a processor, a memory and a network interface connected via a system bus. The processor of the single-chip microcomputer is used to provide computing and control capabilities. The memory of the single-chip microcomputer includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the single-chip microcomputer is used to store data such as temperature values, target output voltage levels, over-temperature load reduction curves corresponding to temperature intervals, load reduction factors, initial current reference signals, etc. The network interface of the single-chip microcomputer is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, an over-temperature protection method for a power conversion device is implemented.

[0173] In one embodiment, an electronic device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0174] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0175] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0176] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0177] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, 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 specification.

[0178] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An over-temperature protection method for a power conversion device, characterized in that: The method comprises: Acquiring a temperature value of the power conversion device; According to the temperature value and a preset temperature range, determining an over-temperature load reduction curve matching the temperature value, wherein the over-temperature load reduction curve is determined according to a temperature rise test result of the power conversion device within the temperature range; Determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve, and the target output voltage level of the power conversion device; The load reduction factor is used to perform load reduction processing on the initial current reference signal to obtain a current reference signal after load reduction; controlling the output current of the power conversion device according to the load-reduced current reference signal to meet the load-reduction requirement corresponding to the temperature value; The over-temperature load reduction curve is generated in the following manner: Determining a preset load reduction requirement according to the critical load power of the power conversion device at different temperature values; Determining a plurality of preset temperature intervals according to a change in the critical load power corresponding to the preset load reduction demand; According to the critical load power in each of the preset temperature intervals, an over-temperature load reduction curve corresponding to each of the preset temperature intervals is generated.

2. The method according to claim 1, characterized in that: The step of generating an over-temperature load reduction curve corresponding to each of the preset temperature intervals according to the critical load power within each of the preset temperature intervals includes: According to the critical load power variation trend in each of the preset temperature intervals, a linear over-temperature load reduction curve corresponding to each of the preset temperature intervals is fitted.

3. The method according to claim 1, characterized in that The determining, according to the temperature value and a preset temperature range, an over-temperature load reduction curve matching the temperature value comprises: A target temperature interval to which the temperature value belongs is determined from the plurality of preset temperature intervals, and an over-temperature derating curve corresponding to the target temperature interval is used as an over-temperature derating curve matching the temperature value.

4. The method according to claim 1, characterized in that: Before the load reduction process is performed on the initial current reference signal by using the load reduction factor, the method further includes: Obtaining an output voltage value of the power conversion device; The initial current reference signal is generated according to the output voltage value and a preset voltage reference signal.

5. The method according to claim 1, characterized in that The determining a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and the target output voltage level of the power conversion device includes: Determining a target output power corresponding to the temperature value according to the temperature value and the over-temperature load reduction curve; Determining a reference current effective value according to the target output power and the target output voltage level; The load reduction factor is determined according to the reference current effective value and the actual inductor current effective value of the power conversion device.

6. A power conversion device, characterized in that: include: A power conversion module, used to convert input power into output power in different forms; A temperature sampling module, used to obtain the temperature value of the power conversion device; Control module, including: a load reduction unit, configured to determine an over-temperature load reduction curve matching the temperature value according to the temperature value and a preset temperature range, and determine a corresponding load reduction factor according to the temperature value, the over-temperature load reduction curve and a target output voltage level of the power conversion device, wherein the over-temperature load reduction curve is determined according to a temperature rise test result of the power conversion device within the temperature range; a current multiplication unit, configured to perform load reduction processing on the initial current reference signal by using the load reduction factor to obtain a current reference signal after load reduction; A current loop control unit, used for controlling the output current of the power conversion device according to the current reference signal after load shedding to meet the load shedding requirement corresponding to the temperature value; The over-temperature load reduction curve is preset in the load reduction unit, and the generation method of the over-temperature load reduction curve includes: Determining a preset load reduction requirement according to the critical load power of the power conversion device at different temperature values; Determining a plurality of preset temperature intervals according to a change in the critical load power corresponding to the preset load reduction demand; According to the critical load power in each of the preset temperature intervals, an over-temperature load reduction curve corresponding to each of the preset temperature intervals is generated.

7. The device according to claim 6, characterized in that The step of generating an over-temperature load reduction curve corresponding to each preset temperature interval according to the critical load power in each preset temperature interval includes: According to the critical load power variation trend in each of the preset temperature intervals, a linear over-temperature load reduction curve corresponding to each of the preset temperature intervals is fitted.

8. A power conversion device, characterized in that: include: A power conversion module and a control module, wherein the control module is configured to perform the steps of the method according to any one of claims 1 to 5.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method according to any one of claims 1 to 5 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used by a processor to execute the steps of the method according to any one of claims 1 to 5.

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