A method, device and equipment for heat dissipation adjustment of power electronic equipment based on model prediction

Abstract

The present invention discloses a method, device and equipment for heat dissipation regulation of power electronic equipment based on model prediction, the method comprising: collecting the temperature of power electronic equipment, and performing voltage-frequency conversion on the temperature value into a frequency signal; receiving the frequency signal of the temperature of the power electronic equipment, obtaining the temperature value of the power electronic equipment by decoding the frequency signal, and performing communication encoding on the temperature value; performing data fitting on the digital temperature value to obtain the real-time heat dissipation model of the power electronic equipment; predicting the temperature of the power electronic device at the next moment according to the real-time heat dissipation model of the power electronic equipment; and controlling the change of the rotation speed of the heat dissipation device actuator according to the predicted temperature and heat dissipation mode of the power electronic equipment. The present invention predicts the heating trend of the power electronic equipment by establishing a real-time heat dissipation model of the power electronic equipment, and adjusts the rotation speed of the heat dissipation device actuator according to the heating trend to realize dynamic regulation of the heat dissipation of the power electronic equipment.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation control of power electronic equipment, and in particular to a heat dissipation adjustment method, device and equipment for power electronic equipment based on model prediction. Background Art

[0002] Power electronic devices are used to convert DC power into AC power, or adjust the frequency, amplitude or phase of AC power. They are widely used in different fields, including power conversion, motor control, solar power generation, wind power generation, uninterruptible power supply systems, etc.

[0003] Power electronic equipment will generate a certain amount of heat during operation, so an effective heat dissipation system is needed to keep its internal temperature within a safe range. Its heat dissipation control is very important because high temperature may reduce equipment performance, shorten life, or even cause equipment failure. Among them, fan cooling is the most widely used. Fan cooling is a common heat dissipation method that uses a fan to introduce cold air into the radiator area to take away the hot air. The fan can usually control the speed based on the data from the temperature sensor to meet the heat dissipation needs of the converter.

[0004] Since the heat dissipation model of power electronic equipment is related to factors such as the semiconductor characteristics of power electronic equipment, heat dissipation equipment, time accumulation and ambient temperature, its mathematical model is multivariable and nonlinear, so it is difficult to establish an accurate mathematical model. In the prior art, it is an effective method to adjust the speed of the heat dissipation device actuator in sections according to the temperature of the inverter to ensure that the inverter obtains proper heat dissipation under different temperature conditions. The heat dissipation device actuator here includes a fan for air cooling, a water pump for cold cooling, and actuators in other heat dissipation methods. The disadvantage of this method is that temperature fluctuations may occur when switching between different temperature sections, especially near the critical temperature point. Adjusting the temperature in sections causes the system response time to become longer, because it takes time to adapt to the new set value when the temperature switches, and it is not suitable for applications that require fast response.

[0005] In view of the above situation, in order to reduce the temperature fluctuation of power electronic equipment and shorten the response time of heat dissipation equipment, the present invention proposes a heat dissipation adjustment method, device and equipment for power electronic equipment based on model prediction. Summary of the invention

[0006] The purpose of the embodiments of the present invention is to provide a method, device and equipment for heat dissipation adjustment of power electronic equipment based on model prediction, so as to solve the above technical problems.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] In a first aspect, an embodiment of the present invention provides a method for heat dissipation adjustment of power electronic equipment based on model prediction, the method comprising:

[0009] Collect the temperature of power electronic equipment and convert the temperature value into a frequency signal by voltage-frequency conversion;

[0010] Receiving a frequency signal of the temperature of the power electronic device, obtaining a temperature value of the power electronic device by decoding the frequency signal, and performing communication encoding on the temperature value;

[0011] Perform data fitting on the digital temperature values ​​to obtain a real-time heat dissipation model for power electronic equipment;

[0012] According to the real-time heat dissipation model of power electronic equipment, the temperature of the power electronic device at the next moment is predicted;

[0013] According to the predicted temperature and heat dissipation mode of the power electronic equipment, the speed change of the actuator of the heat dissipation device is controlled.

[0014] In one embodiment, performing data fitting on the digital temperature value to obtain a real-time heat dissipation model of the power electronic device includes:

[0015] A regression equation of a real-time heat dissipation model of power electronic equipment is established; the regression equation of the real-time heat dissipation model of power electronic equipment is:

[0016] T=Xθ

[0017] Where T represents the temperature matrix of the power electronic equipment; X represents the two-dimensional variable matrix, X = [I t] T , where I represents the effective value of the three-phase current, t represents the system operation time; θ represents the regression coefficient matrix;

[0018] The real-time heat dissipation model of the power electronic device is calculated based on the regression equation; the calculation method is as follows:

[0019]

[0020]

[0021] P(N)=P(N-1)-G(N)X T (N)P(N-1)]

[0022] in, and is the estimated value of the last regression coefficient and the estimated value of this regression coefficient, is the prediction of the observed value, T(N) is the actual temperature value, G(N) is the prediction gain term, and P(N) is the intermediate term.

[0023] In one implementation, the real-time heat dissipation model of the power electronic device is:

[0024]

[0025] in, is the estimated value of the regression coefficient.

[0026] In one implementation, the predicted temperature of the power electronic device at the next moment is:

[0027] Set the two-dimensional variable matrix X = [I(k), t+nΔT] T , calculate the predicted temperature value of the power electronic equipment in the case of a two-dimensional variable matrix;

[0028] Among them, I(k) is the effective value of the three-phase given current at the moment of calculation using the digital signal processing chip, ΔT is set as the heat conduction time from the power electronic device to the temperature collection point, and n is the prediction step size. In one embodiment, the heat dissipation mode includes: high-performance heat dissipation mode and low-power heat dissipation mode; the high-performance heat dissipation mode means that the expected operating temperature is fixed, and the predicted temperature is compared with the set temperature in real time to obtain the operating speed instruction of the heat dissipation device actuator, and then the heat dissipation device actuator is controlled to operate according to the instruction speed; the low-power heat dissipation mode means that the expected operating temperature is not fixed, and the expected operating temperature T linearly related to the curve is obtained through the expected operating temperature curve. ref , according to the expected operating temperature T ref The operating speed instruction of the heat dissipation device actuator is obtained, and then the heat dissipation device actuator is controlled to operate according to the instruction speed.

[0029] In one implementation, the speed command is obtained by the following formula:

[0030]

[0031] Among them, n ref is the expected operating speed of the heat dissipation device actuator, n set is the preset speed of the heat dissipation device actuator; T is the predicted power electronic device temperature, T ref is the expected operating temperature of the power electronic equipment, T max is the maximum permissible operating temperature of the power electronic equipment, T min is the minimum permissible operating temperature of the power electronic equipment, n N is the rated speed of the actuator of the heat dissipation device; limit n ref >0.

[0032] In one embodiment, the preset speed n of the heat dissipation device actuator is set Set to 50%nN , the expected operating temperature T of the power electronic equipment ref Set to 45℃; Expected operating speed of the actuator when using heat sink n ref A ramp function is added once for transition.

[0033] In one embodiment, the expected operating temperature curve is used to obtain the expected operating temperature T linearly related to the curve. ref ,include:

[0034] When the temperature of the power electronic equipment is lower than the ambient temperature T 0 , the first desired operating temperature T ref1 is the ambient temperature;

[0035] When the temperature of the power electronic equipment is at the first operating temperature T 1 With the second operating temperature T 2 When the expected temperature of the power electronic equipment is between 1 and 2, the expected operating temperature T ref2 ;

[0036] When the temperature of the power electronic equipment is at the second operating temperature T 2 With the third operating temperature T 3 When the expected temperature of the power electronic equipment is between 1 and 2, the expected operating temperature of the power electronic equipment is set to the third expected operating temperature T ref3 ;

[0037] When the temperature of the power electronic equipment is greater than the third operating temperature T 3 , the actuator of the forced cooling device operates at the maximum speed and issues an alarm signal;

[0038] When the expected operating temperature T ref When crossing between the desired operating temperatures, the desired operating temperature T ref A ramp function is used for transition.

[0039] In a second aspect, an embodiment of the present invention provides a heat dissipation adjustment device for power electronic equipment based on model prediction, characterized in that the device comprises:

[0040] The temperature acquisition and voltage-frequency conversion module is used to acquire the temperature of the power electronic equipment and convert the temperature value into a frequency signal by voltage-frequency conversion;

[0041] A communication module is used to receive a frequency signal of the temperature of the power electronic device, obtain the temperature value of the power electronic device by decoding the frequency signal, and perform communication encoding on the temperature value;

[0042] The temperature model calculation module is used to perform data fitting on the digital temperature value to obtain the real-time heat dissipation model of the power electronic equipment;

[0043] A temperature prediction module is used to predict the temperature of the power electronic device at the next moment according to the real-time heat dissipation model of the power electronic device;

[0044] The heat dissipation device actuator control module is used to control the change of the rotation speed of the heat dissipation device actuator according to the predicted temperature and heat dissipation mode of the power electronic equipment.

[0045] In a third aspect, an embodiment of the present invention provides a power electronic device, including the power electronic device heat dissipation adjustment device based on model prediction as described above.

[0046] Beneficial effects of the present invention:

[0047] The present invention identifies the nonlinear heat dissipation model of the equipment through the temperature curve fitting algorithm of the power electronic equipment, obtains the heat dissipation model of the power electronic equipment, and predicts the temperature of the power electronic equipment at a future moment based on the model, thereby guiding the operation instructions of the heat dissipation equipment at this moment in advance, adjusting the speed of the heat dissipation equipment actuator, so as to realize the dynamic adjustment of the heat dissipation of the power electronic equipment, and finally obtain a satisfactory heat dissipation effect of the power electronic equipment. And because the present invention has the function of heat dissipation model identification and heat dissipation trend prediction, it reduces the temperature fluctuation of the power electronic equipment, shortens the response time, improves the heat dissipation efficiency of the power electronic equipment, and reduces energy consumption at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0049] In the attached picture:

[0050] Figure 1 A flow chart of a method for heat dissipation adjustment of power electronic equipment based on model prediction provided by one embodiment of the present invention;

[0051] Figure 2 A schematic diagram of an expected operating temperature curve in a low power dissipation mode provided in an embodiment of the present invention;

[0052] Figure 3 A schematic diagram of the structure of a heat dissipation adjustment device for power electronic equipment based on model prediction provided in one embodiment of the present invention;

[0053] Figure 4 A temperature acquisition circuit provided in one embodiment of the present invention;

[0054] Figure 5A voltage-frequency conversion circuit is provided in one embodiment of the present invention.

[0055] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0056] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0057] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] The optional embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0059] like Figure 1 As shown, an embodiment of the present disclosure provides a method for heat dissipation adjustment of power electronic equipment based on model prediction, the method comprising:

[0060] Step S100: collecting the temperature of the power electronic equipment and performing voltage-frequency conversion on the temperature value to convert it into a frequency signal.

[0061] Specifically, the temperature of power electronic equipment can be collected by collecting the differential voltage signal of the thermistor of the power electronic equipment through a bridge circuit, and the voltage signal of the thermistor is proportionally amplified after filtering through an operational amplifier circuit. Voltage-frequency conversion is to convert the voltage into a frequency signal through a voltage-frequency conversion circuit.

[0062] Step S200: receiving a frequency signal of the temperature of the power electronic device, obtaining a temperature value of the power electronic device by decoding the frequency signal, and performing communication encoding on the temperature value.

[0063] In the embodiment of the present application, the frequency signal can be received by using a programmable logic device FPGA, and the reception of the frequency signal can also be achieved by other programmable logic devices such as CPLD. Receiving the frequency signal is to collect the high and low levels of the frequency signal through the pins of the programmable logic device. Decoding the frequency signal is to obtain the digital temperature value represented by the frequency through timing counting, and express it with a signed number. Communication coding is to encode the digital temperature value for communication, and then send it through an optical fiber or a communication cable. The communication coding is to add a frame header and parity check information.

[0064] Step S300: performing data fitting on the digital temperature value to obtain a real-time heat dissipation model of the power electronic device.

[0065] In the embodiment of the present application, the digital temperature value is subjected to data fitting to obtain a real-time heat dissipation model of the power electronic device, including:

[0066] A regression equation of a real-time heat dissipation model of power electronic equipment is established; the regression equation of the real-time heat dissipation model of power electronic equipment is:

[0067] T=Xθ

[0068] Where T represents the temperature matrix of the power electronic equipment; X represents the two-dimensional variable matrix, X = [I t] T , where I represents the effective value of the three-phase current, t represents the system operation time; θ represents the regression coefficient matrix;

[0069] The real-time heat dissipation model of the power electronic device is calculated based on the regression equation; the calculation method is as follows:

[0070]

[0071]

[0072] P(N)=P(N-1)-G(N)X T (N)P(N-1)]

[0073] in, and is the estimated value of the last regression coefficient and the estimated value of this regression coefficient, is the prediction of the observed value, T(N) is the actual temperature value, G(N) is the prediction gain term, and P(N) is the intermediate term.

[0074] In one implementation, the real-time heat dissipation model of the power electronic device is:

[0075]

[0076] in, is the estimated value of the regression coefficient.

[0077] Step S400: predicting the temperature of the power electronic device at the next moment according to the real-time heat dissipation model of the power electronic device.

[0078] Furthermore, the predicted temperature of the power electronic device at the next moment is:

[0079] Set the two-dimensional variable matrix X = [I(k), t+nΔT] T , calculate the predicted temperature value of the power electronic equipment in the case of a two-dimensional variable matrix;

[0080] Among them, I(k) is the effective value of the three-phase given current at the current calculation moment using the digital signal processing chip, ΔT is set as the heat conduction time from the power electronic device to the temperature collection point, and n is the prediction step size.

[0081] Preferably, ΔT is set to 0.05 seconds and n is set to 10 steps.

[0082] Step S500: controlling the change of the rotation speed of the actuator of the heat dissipation device according to the predicted temperature and heat dissipation mode of the power electronic device.

[0083] Since the temperature prediction value of the power electronic equipment is available, the operating temperature setting value of the power electronic equipment can have more options.

[0084] In the embodiment of the present application, the heat dissipation mode includes: a high-performance heat dissipation mode and a low-power heat dissipation mode; the high-performance heat dissipation mode means that the expected operating temperature is fixed, and the predicted temperature is compared with the set temperature in real time to obtain the operating speed instruction of the heat dissipation device actuator, and then the heat dissipation device actuator is controlled to operate according to the instruction speed; the low-power heat dissipation mode means that the expected operating temperature is not fixed, and the expected operating temperature T linearly related to the curve is obtained through the expected operating temperature curve. ref , according to the expected operating temperature T ref The operating speed instruction of the heat dissipation device actuator is obtained, and then the heat dissipation device actuator is controlled to operate according to the instruction speed.

[0085] Furthermore, the speed command is obtained by the following formula:

[0086]

[0087] Among them, n ref is the expected operating speed of the heat dissipation device actuator, n set is the preset speed of the heat dissipation device actuator; T is the predicted power electronic device temperature, T ref is the expected operating temperature of the power electronic equipment, T max is the maximum permissible operating temperature of the power electronic equipment, T min is the minimum permissible operating temperature of the power electronic equipment, n N is the rated speed of the actuator of the heat dissipation device; limit n ref >0.

[0088] Preferably, the preset speed n of the heat dissipation device actuator is set Set to 50%n N , the expected operating temperature T of the power electronic equipment ref Set to 45℃; Expected operating speed of the actuator when using heat sink n refA ramp function is added once for transition.

[0089] Reference Figure 2 As shown, in the embodiment of the present application, the expected operating temperature T linearly correlated with the expected operating temperature curve is obtained through the expected operating temperature curve. ref ,include:

[0090] When the temperature of the power electronic equipment is lower than the ambient temperature T 0 , the first desired operating temperature T ref1 is the ambient temperature;

[0091] When the temperature of the power electronic equipment is at the first operating temperature T 1 With the second operating temperature T 2 When the expected temperature of the power electronic equipment is between 1 and 2, the expected operating temperature T ref2 ;

[0092] When the temperature of the power electronic equipment is at the second operating temperature T 2 With the third operating temperature T 3 When the expected temperature of the power electronic equipment is between 1 and 2, the expected operating temperature of the power electronic equipment is set to the third expected operating temperature T ref3 ;

[0093] When the temperature of the power electronic equipment is greater than the third operating temperature T 3 , the actuator of the forced cooling device operates at the maximum speed and issues an alarm signal;

[0094] When the expected operating temperature T ref When crossing between the desired operating temperatures, the desired operating temperature T ref A ramp function is used for transition.

[0095] Since the heat dissipation model of power electronic equipment is related to the semiconductor characteristics of power electronic equipment, heat dissipation equipment, time accumulation and ambient temperature, its mathematical model is multivariable and nonlinear, so it is difficult to establish an accurate mathematical model. The present invention identifies the nonlinear heat dissipation model of the equipment through the temperature curve fitting algorithm of the power electronic equipment, obtains the heat dissipation model of the power electronic equipment, and predicts the temperature of the power electronic equipment at a future moment based on the model, thereby guiding the operation instructions of the heat dissipation equipment at this moment in advance, and finally obtaining a satisfactory heat dissipation effect of the power electronic equipment. Adjusting the heat dissipation equipment according to the future heating situation not only reduces the loss of the equipment and improves the heat dissipation efficiency, but also reduces the temperature fluctuation of the power electronic equipment and shortens the response time of the heat dissipation equipment.

[0096] Figure 3The present invention shows a schematic diagram of a heat dissipation regulating device for power electronic equipment based on model prediction, which includes: a temperature acquisition and voltage-frequency conversion module, a communication module, a temperature model calculation module, a temperature prediction module and a heat dissipation device actuator control module.

[0097] The temperature acquisition and voltage-frequency conversion module is used to acquire the temperature of the power electronic equipment and convert the temperature value into a frequency signal by voltage-frequency conversion;

[0098] Specifically, the temperature acquisition module collects the differential voltage signal of the thermistor of the power electronic equipment through a bridge circuit, and amplifies the voltage signal of the thermistor after filtering through the operational amplifier circuit. The circuit diagram of the temperature acquisition module is shown in Figure 4 As shown, it includes a thermistor, a bridge acquisition circuit, an active filter amplifier circuit, etc. In the figure, U2 is an operational amplifier. Voltage-frequency conversion is to convert voltage into a frequency signal through a voltage-frequency conversion circuit. Its circuit diagram is as follows Figure 5 As shown, Y1 is a crystal oscillator and U4 is a voltage-frequency conversion chip.

[0099] The communication module is used to receive the frequency signal of the temperature of the power electronic device, obtain the temperature value of the power electronic device by decoding the frequency signal, and perform communication encoding on the temperature value.

[0100] Specifically, the temperature of the power electronic device represented by the frequency is encoded for communication, and the data is transmitted using an optical fiber or a communication cable. Since the temperature acquisition of the power electronic device is in the high voltage working area, it is far away from the temperature model calculation and model prediction module. In order to ensure that the data transmission is free from interference, this embodiment uses a communication method to transmit the temperature acquisition data. Communication encoding and decoding are completed in the programmable logic chip and the digital signal processing chip respectively.

[0101] The temperature model calculation module is used to perform data fitting on the digital temperature value to obtain the real-time heat dissipation model of the power electronic equipment.

[0102] Specifically, the temperature model calculation module uses the nonlinear relationship between temperature, current command, and time to calculate the approximate fitting model of heat dissipation. The temperature model calculation is completed in the digital signal processing chip. By fitting the digital temperature value, the real-time heat dissipation model of the power electronic device is obtained.

[0103] The temperature prediction module is used to predict the temperature of the power electronic device at the next moment according to the real-time heat dissipation model of the power electronic device.

[0104] The heat dissipation device actuator control module is used to control the change of the rotation speed of the heat dissipation device actuator according to the predicted temperature and heat dissipation mode of the power electronic equipment.

[0105] It should be noted that the above embodiments provide a method for adjusting the heat dissipation of power electronic equipment based on model prediction, which is illustrated only by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the power electronic equipment heat dissipation adjustment device based on model prediction provided in the above embodiments and the embodiment of the method for adjusting the heat dissipation of power electronic equipment based on model prediction belong to the same concept, and the embodiment and implementation process thereof are detailed in the embodiment of the method for adjusting the heat dissipation of power electronic equipment based on model prediction, which will not be repeated here.

[0106] The present invention predicts the heating trend of power electronic equipment by establishing a real-time heat dissipation model of power electronic equipment, and adjusts the speed of the heat dissipation device actuator according to the heating trend to achieve dynamic adjustment of the heat dissipation of power electronic equipment. The method has the functions of heat dissipation model identification and heat dissipation trend prediction, thereby reducing the temperature fluctuation of power electronic equipment, shortening the response time, improving the heat dissipation efficiency of power electronic equipment, and reducing energy consumption.

[0107] In one embodiment, a power electronic device is provided, including the above-mentioned power electronic device heat dissipation adjustment device based on model prediction. For the description of the control device, please refer to the description of the same or similar parts above, which will not be repeated here.

[0108] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0109] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0110] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A method for heat dissipation adjustment of power electronic equipment based on model prediction, characterized in that: The method includes: Collect the temperature of power electronic equipment and convert the temperature value into a frequency signal by voltage-frequency conversion; Receiving a frequency signal of the temperature of the power electronic device, obtaining a temperature value of the power electronic device by decoding the frequency signal, and performing communication encoding on the temperature value; Perform data fitting on the digital temperature values ​​to obtain a real-time heat dissipation model for power electronic equipment; The digital temperature value is subjected to data fitting to obtain a real-time heat dissipation model of the power electronic equipment; including: A regression equation of a real-time heat dissipation model of power electronic equipment is established; the regression equation of the real-time heat dissipation model of power electronic equipment is: ， Where T represents the temperature matrix of the power electronic equipment; X represents the two-dimensional variable matrix, X=[I t] T , where I represents the effective value of the three-phase current, and t represents the system operation time; represents the regression coefficient matrix; The real-time heat dissipation model of the power electronic device is calculated based on the regression equation; the calculation method is as follows: ， ， ， in, and is the estimated value of the last regression coefficient and the estimated value of this regression coefficient, is the prediction for this observation, is the actual temperature value, is the prediction gain term, is the middle term; According to the real-time heat dissipation model of power electronic equipment, the temperature of the power electronic device at the next moment is predicted; Control the change of the speed of the actuator of the heat dissipation device according to the predicted temperature and heat dissipation mode of the power electronic equipment; The speed command is obtained by the following formula: ， Among them, n ref is the expected operating speed of the heat dissipation device actuator, n set A preset speed for the actuator of the heat dissipation device; To predict the power electronics temperature, For the expected operating temperature of the power electronic equipment, is the maximum permissible operating temperature of the power electronic equipment, is the minimum permissible operating temperature of power electronic equipment, The rated speed of the actuator of the heat dissipation device; ≥0.

2. The method for heat dissipation adjustment of power electronic equipment based on model prediction according to claim 1, characterized in that: The real-time heat dissipation model of the power electronic equipment is: ， in, is the estimated value of the regression coefficient.

3. The method for heat dissipation adjustment of power electronic equipment based on model prediction according to claim 1, characterized in that: The predicted temperature of the power electronic device at the next moment is: Set the two-dimensional variable matrix X=[I(k), t+n T] T , calculate the predicted temperature value of the power electronic equipment in the case of a two-dimensional variable matrix; Among them, I(k) is the effective value of the three-phase given current at the moment of calculation using the digital signal processing chip, T is set as the heat conduction time from the power electronic device to the temperature collection point, and n is the prediction step length.

4. The method for heat dissipation adjustment of power electronic equipment based on model prediction according to claim 1, characterized in that: The heat dissipation modes include: high-performance heat dissipation mode and low-power heat dissipation mode; the high-performance heat dissipation mode means that the expected operating temperature is fixed, and the predicted temperature is compared with the set temperature in real time to obtain the operating speed instruction of the heat dissipation device actuator, and then the heat dissipation device actuator is controlled to operate according to the instruction speed; the low-power heat dissipation mode means that the expected operating temperature is not fixed, and the expected operating temperature linearly related to the curve is obtained through the expected operating temperature curve , according to the expected operating temperature The operating speed instruction of the heat dissipation device actuator is obtained, and then the heat dissipation device actuator is controlled to operate according to the instruction speed.

5. The method for heat dissipation adjustment of power electronic equipment based on model prediction according to claim 4, characterized in that: The preset speed n of the heat dissipation device actuator set Set to 50% , the expected operating temperature of power electronics Set to 45℃; Expected operating speed of the actuator when using heat sink n ref A ramp function is added once for transition.

6. The method for heat dissipation adjustment of power electronic equipment based on model prediction according to claim 5, characterized in that: The expected operating temperature curve is used to obtain the expected operating temperature linearly related to the curve. ,include: When the temperature of the power electronic equipment is lower than the ambient temperature T0, the first desired operating temperature is the ambient temperature; When the temperature of the power electronic device is between the first operating temperature T1 and the second operating temperature T2, the expected temperature of the power electronic device is set to the second expected operating temperature ; When the temperature of the power electronic device is between the second operating temperature T2 and the third operating temperature T3, the expected temperature of the power electronic device is set to the third expected operating temperature ; When the temperature of the power electronic equipment is greater than the third operating temperature T3, the actuator of the forced heat dissipation equipment operates at the maximum speed and sends out an alarm signal; When the expected operating temperature When crossing between the desired operating temperatures, the desired operating temperature A ramp function is used for transition.

7. A heat dissipation adjustment device for power electronic equipment based on model prediction, characterized in that: The device includes: The temperature acquisition and voltage-frequency conversion module is used to acquire the temperature of the power electronic equipment and convert the temperature value into a frequency signal by voltage-frequency conversion; The communication module is used to receive the frequency signal of the temperature of the power electronic equipment and obtain the Obtaining the temperature value of the power electronic equipment and performing communication encoding on the temperature value; The temperature model calculation module is used to perform data fitting on the digital temperature value to obtain the real-time heat dissipation model of the power electronic equipment; The digital temperature value is subjected to data fitting to obtain a real-time heat dissipation model of the power electronic equipment; including: A regression equation of a real-time heat dissipation model of power electronic equipment is established; the regression equation of the real-time heat dissipation model of power electronic equipment is: ， Where T represents the temperature matrix of the power electronic equipment; X represents the two-dimensional variable matrix, X=[I t] T , where I represents the effective value of the three-phase current, and t represents the system operation time; represents the regression coefficient matrix; The real-time heat dissipation model of the power electronic device is calculated based on the regression equation; the calculation method is as follows: ， ， ， in, and is the estimated value of the last regression coefficient and the estimated value of this regression coefficient, is the prediction for this observation, is the actual temperature value, is the prediction gain term, is the middle term; A temperature prediction module is used to predict the temperature of the power electronic device at the next moment according to the real-time heat dissipation model of the power electronic device; A heat dissipation device actuator control module, used to control the change of the speed of the heat dissipation device actuator according to the predicted temperature and heat dissipation mode of the power electronic equipment; The speed command is obtained by the following formula: ， Among them, n ref is the expected operating speed of the heat dissipation device actuator, n set A preset speed for the actuator of the heat dissipation device; To predict the power electronics temperature, For the expected operating temperature of the power electronic equipment, is the maximum permissible operating temperature of the power electronic equipment, is the minimum permissible operating temperature of power electronic equipment, The rated speed of the actuator of the heat dissipation device; ≥0.

8. A power electronic device, characterized in that: It includes the heat dissipation regulating device for power electronic equipment based on model prediction as described in claim 7.

Images