Ring temperature self-adaptive output compensation method and device of power electronic conversion device

Abstract

The application provides a kind of ambient temperature self-adaptive output compensation method and device of power electronic conversion device, comprising: every interval first preset length, determine the reference compensation amount of current time power electronic conversion device, reference compensation amount is in the process of normalizing power electronic conversion device measured output value, the difference between the measured output value under the measured ambient temperature and the measured output value under the reference ambient temperature;Based on reference compensation amount, calibrate the expected output value, sampling output value of power electronic conversion device, respectively obtain new expected output value, actual output value;Expected output value and actual output value are sent to operation module, so that operation module determines output compensation value based on expected output value and actual output value, and output compensation value is used to control module to regulate the output of power electronic conversion device.The application makes the output of power electronic conversion device dynamically adjusted with internal environment temperature in the calibration process, so as to improve the output accuracy of power electronic conversion device.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a method and apparatus for adaptive output compensation of ambient temperature in a power electronic converter. Background Technology

[0002] The output accuracy indicators of power electronic converters, such as output voltage accuracy, current accuracy, current regulation accuracy, and voltage regulation accuracy, are important indicators assessed by national standards and are also highlights that different companies use to demonstrate the advantages of their products. Therefore, how to improve the output accuracy of power electronic converters is a key research issue in the power supply industry.

[0003] Chinese patent CN112737338A discloses a voltage compensation method and a voltage compensation device. The disclosed scheme is as follows: Data on a cluster of output voltages V and output power P of a frequency converter power supply are obtained. This data, along with the rated voltage Vn of the frequency converter power supply, is used to calculate the deviation voltage ΔV and output power. Simultaneously, a ΔV-P curve is plotted. Based on the load's operating power and the deviation curve ΔV-P, the compensation voltage Vcom under that operating power is calculated. Finally, the compensation voltage Vcom is added to the output voltage control command of the frequency converter power supply, thereby achieving real-time compensation of the frequency converter power supply's output voltage.

[0004] The aforementioned prior art takes into account the output voltage deviation caused by changes in output load and can achieve a certain degree of voltage compensation. However, it cannot compensate for deviations caused by other reasons. For example, when a power electronic converter is working, its sampling circuit will generally have sampling errors. Of course, there are also errors caused by other uncertain reasons. At present, it is difficult to compensate for the output deviation caused by sampling errors or other uncertain errors of the power electronic converter in real time. Summary of the Invention

[0005] This application provides an ambient temperature adaptive output compensation method and apparatus for a power electronic converter, in order to solve the problems in the background art mentioned above.

[0006] In a first aspect, this application provides an ambient temperature adaptive output compensation method for a power electronic converter, comprising:

[0007] At each first preset time interval, the reference compensation amount of the power electronic converter is determined for the current time. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter.

[0008] Based on the reference compensation amount, the expected output value and sampled output value of the power electronic converter are calibrated to obtain new expected output value and actual output value, respectively.

[0009] The new expected output value and the actual output value are sent to the calculation module so that the calculation module determines an output compensation value based on the expected output value and the actual output value. The output compensation value is used by the control module to regulate the output of the power electronic converter.

[0010] Optionally, the power electronic conversion device includes multiple target output values, and each target output value corresponds to a measured output value-temperature curve. Determining the reference compensation amount for the power electronic conversion device at the current time includes:

[0011] Obtain the current internal ambient temperature of the power electronic converter;

[0012] Obtain the sampled output value at the current time, and determine the target output value corresponding to the sampled output value;

[0013] Determine a measured output value-temperature curve that matches the target output value. The measured output value-temperature curve is the curve of different measured output values ​​and internal ambient temperature when the output of the power electronic converter is centered on the target output value.

[0014] From the matched measurement output value-temperature curve, query the measurement output value and reference output value corresponding to the internal ambient temperature;

[0015] The difference between the measured output value and the reference output value is determined to obtain the reference compensation amount.

[0016] Optionally, the process of calibrating the sampled output value based on the reference compensation amount to obtain the actual output value of the power electronic converter includes:

[0017] Based on the reference compensation amount and the sampled output value, a first actual output value-sampled output value curve of the power electronic converter is fitted. The first actual output value-sampled output value curve is a curve with the sampled output value and the reference compensation amount as independent variables and the actual output value as the dependent variable.

[0018] The actual output value is calculated based on the sampled output value, the reference compensation amount, and the first actual output value-sampled output value curve.

[0019] Optionally, for each target output value, its measured output value-temperature curve is determined using the following method:

[0020] At every second preset time interval, the internal ambient temperature of the power electronic converter is sampled by the ambient temperature sampling unit;

[0021] When sampling an internal ambient temperature, the output value of the power electronic converter is measured by the output measuring device to obtain the measured output value;

[0022] Establish the correspondence between each of the measured output values ​​and the internal ambient temperature to obtain the curve of the measured output value-temperature.

[0023] Optionally, the calculation module determines the output compensation value based on the new expected output value and the actual output value, including:

[0024] The expected output value and the actual output value are compared to obtain the output compensation value.

[0025] Optionally, the control module regulates the output of the power electronic converter, including:

[0026] When the output compensation value is positive, the output of the power electronic converter is increased.

[0027] When the output compensation value is negative, the output of the power electronic converter is reduced.

[0028] Optionally, the power electronic conversion device is a charging pile.

[0029] Secondly, this application provides an ambient temperature adaptive output compensation device for a power electronic converter, comprising:

[0030] The determination module is used to determine the reference compensation amount of the power electronic converter at each first preset time interval. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter.

[0031] The calibration module is used to calibrate the expected output value or sampled output value of the power electronic converter based on the reference compensation amount, so as to obtain a new expected output value or actual output value respectively.

[0032] The sending module is used to send the expected output value and the actual output value to the calculation module, so that the calculation module determines the output compensation value based on the expected output value and the actual output value, and the output compensation value is used by the control module to regulate the output of the power electronic conversion device.

[0033] Thirdly, embodiments of this application provide an electronic device, including:

[0034] One or more processors;

[0035] Memory, used to store one or more programs;

[0036] When one or more programs are executed by one or more processors, the one or more processors execute the method described in the first aspect above.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being used to implement the method of the first aspect described above.

[0038] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect.

[0039] The ambient temperature adaptive output compensation method for power electronic converters provided in this application determines a reference compensation amount and a sampled output value for the power electronic converter. The reference compensation amount includes, but is not limited to, the discreteness of electronic components in the sampling circuit and the sampling error caused by temperature changes in the environment. Based on the reference compensation amount and the sampled output value, an output compensation value is determined, thereby adjusting the actual output of the power electronic converter according to the output compensation value. Compared to existing technologies that do not consider the sampling error caused by changes in the ambient temperature of the sampling circuit during the calibration process, the ambient temperature adaptive output compensation method for power electronic converters provided in this application dynamically adjusts the output compensation value according to the internal temperature of the power electronic converter, and then dynamically adjusts the output of the power electronic converter according to the output compensation value. This allows the output of the power electronic converter to dynamically adjust with the internal ambient temperature, thereby improving the output accuracy of the power electronic converter. Attached Figure Description

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

[0041] Figure 1 An implementation environment architecture diagram of an ambient temperature adaptive output compensation method for a power electronic converter provided in an embodiment of this application;

[0042] Figure 2 An implementation environment architecture diagram of an ambient temperature adaptive output compensation method for a power electronic converter provided in another embodiment of this application;

[0043] Figure 3 A flowchart illustrating an ambient temperature adaptive output compensation method for a power electronic converter, provided as an embodiment of this application;

[0044] Figure 4 A flowchart illustrating a method for obtaining a curve of measured output value versus temperature, provided in another embodiment of this application;

[0045] Figure 5 A flowchart illustrating a method for obtaining a reference compensation amount, as provided in another embodiment of this application;

[0046] Figure 6 A flowchart illustrating a method for solving actual output values, provided in another embodiment of this application;

[0047] Figure 7 A flowchart illustrating a method for solving for actual output values, provided in another embodiment of this application;

[0048] Figure 8 A UT curve diagram provided for another embodiment of this application;

[0049] Figure 9 A UT curve diagram provided for another embodiment of this application;

[0050] Figure 10 A UT curve diagram provided for another embodiment of this application;

[0051] Figure 11 A block diagram of an ambient temperature adaptive output compensation device for a power electronic converter, provided in another embodiment of this application;

[0052] Figure 12 A block diagram of an ambient temperature adaptive output compensation device for a power electronic converter, provided in another embodiment of this application;

[0053] Figure 13 This is a schematic diagram of the structure of a computer system according to an embodiment of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application. In addition, it should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] Figure 1 and Figure 2 This is an implementation environment architecture diagram of an ambient temperature adaptive output compensation method for a power electronic converter according to an embodiment of this application. Figure 1 and Figure 2 As shown, the implementation environment architecture includes: power electronic conversion device, load, control module, wave generation module and terminal.

[0056] The power electronic converter includes an ambient temperature sampling unit and an output sampling unit. The ambient temperature sampling unit samples the internal temperature of the power electronic converter. The output sampling unit samples the output value of the power electronic converter.

[0057] The output of the power electronic converter is electrically connected to the load to provide electrical energy to the load.

[0058] Furthermore, a high-precision multimeter is electrically connected to the output terminal of the power electronic converter to measure the output value of the power electronic converter and obtain the measured output value.

[0059] It should be noted that high-precision multimeters are installed only as needed. For example, they are required when the UT curve mentioned below needs to be determined in advance, but are not required when actually using power electronic conversion devices.

[0060] The terminal includes a determination module, a calibration module, and a transmission module. Furthermore, the calibration module includes a first calibration unit and a second calibration unit. Even further, the terminal also includes a processor, a memory, etc., for storing, calculating, and performing other operations on the received data.

[0061] The ambient temperature sampling unit is signal-connected to the determination module of the terminal and is used to send temperature sampling values ​​to the determination module. The output sampling unit is connected to the second calibration unit of the terminal and is used to send the sampled output value to the second calibration unit so that the second calibration unit can calibrate the sampled output value according to the fitted curve to obtain the actual output value, and then send the actual output value to the calculation module through the sending module.

[0062] The first calibration unit is used to calibrate the expected output value, and then send the calibrated expected output value to the sending module, which in turn sends the calibrated expected output value to the calculation module.

[0063] The arithmetic module receives the expected output value and the actual output value, and performs a calculation between the expected output value and the actual output value, usually a difference calculation, to determine the difference between the expected output value and the actual output value. This difference is also the output compensation value, and the output compensation value is sent to the control module.

[0064] The control module is signal-connected to the arithmetic module and is used to receive the output compensation value and send adjustment commands to the wave generation module according to the output compensation value. The adjustment commands are generally to increase or decrease the positive-to-negative ratio. Increasing the positive-to-negative ratio increases the output of the power electronic converter, while decreasing the positive-to-negative ratio decreases the output of the power electronic converter.

[0065] The waveform generation module is used to receive control commands and adjust the output of the power electronic converter according to the control commands, so that the actual output value of the power electronic converter can continuously approach the expected output value, thereby achieving the desired output.

[0066] Figure 3 This is a flowchart illustrating an ambient temperature adaptive output compensation method for a power electronic converter according to an embodiment of this application. Figure 3 The method shown can be derived from Figure 1 and Figure 2 Execution in the terminal, such as Figure 3 As shown, the method includes the following steps:

[0067] Step 201: At each first preset time interval, determine the reference compensation amount of the power electronic converter at the current time. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter.

[0068] The reference compensation amount is generally related to the error, and this error is more of a sampling error. Therefore, the reference compensation amount includes the sampling error caused by the temperature change of the environment where the sampling circuit is located, but is not limited to the sampling error.

[0069] Furthermore, the sampling error is the difference between the measured output value and the sampled output value, where the sampled output value is the output value of the power electronic converter obtained by sampling through the sampling circuit.

[0070] Generally, the sampling error is caused by inaccurate sampling. Sampling circuits usually have errors, which are generally caused by the following reasons: for example, errors in the components themselves in the sampling circuit, especially the accuracy of the sampling resistor, the output accuracy of the operational amplifier, and the accuracy of the reference voltage; in addition, since the operating temperature of power electronic converters is generally wide, ranging from -40℃ to 75℃, it is inevitable that the output accuracy of the power electronic converter will be insufficient due to temperature changes in the environment where the components are located.

[0071] The first preset duration can be set according to actual needs or experience, such as 5 seconds, 7 seconds or 10 seconds, etc., and this application embodiment does not limit it.

[0072] The power electronic conversion device can be a circuit structure in the form of AC / DC, DC / AC, AC / AC and DC / DC or a combination of topologies. Furthermore, the power electronic conversion device can also be other output devices, such as a charging pile. This application embodiment does not impose specific limitations on this.

[0073] Furthermore, the output of the power electronic conversion device can be output voltage, output current, output power, etc., and this application embodiment does not limit this.

[0074] Of course, the dynamic control of the compensation value of the power electronic converter is not limited to the output; it can also be the input, such as the input voltage, input current, or input power. However, this application mainly describes the output as an example.

[0075] The measured output value is obtained by directly measuring the output terminal of a high-precision measuring instrument, such as a high-precision multimeter, connected externally to the power electronic converter. Therefore, the measured output value is generally more accurate than the sampled output value. If the sampled output value is not equal to the measured output value, it is generally considered that the sampled output value is incorrect. Therefore, sampling error can be simply considered as the difference between the measured output value and the sampled output value caused by inaccurate sampling.

[0076] Generally, a power electronic converter has a fixed output range; for example, taking output voltage as an example, its output range is 200V-800V. Furthermore, the power electronic converter can include multiple target output values ​​within this output range. These target output values ​​can be manually set, for example, 200V, 300V, 400V, 500V, 600V, 700V, and 800V.

[0077] However, the output of a power electronic converter is highly dependent on its internal ambient temperature. Therefore, for each target output value, the power electronic converter cannot output exactly the target value; errors are inevitable. Consequently, for each target output value, different output values ​​will occur at different temperatures, and these output values ​​will tend to cluster around the target output value. Furthermore, this output value can be obtained through measurement, becoming the aforementioned measured output value. Therefore, for each target output value, there can be a corresponding measured output value-temperature curve. Additionally, for ease of description, this measured output value-temperature curve can also be referred to as the UT curve in this application.

[0078] It should be noted that the measured output value-temperature curve for each target output value can be established beforehand. Optionally, see [link to relevant documentation]. Figure 4 The curve of the measured output value versus temperature for any one of the target output values ​​can be established using the following method:

[0079] Step 2011: At every second preset time interval, the internal ambient temperature of the power electronic converter is sampled by the ambient temperature sampling unit.

[0080] The second preset duration can be set according to actual needs or experience, such as 5 seconds, 7 seconds or 10 seconds, etc., and this application embodiment does not limit it.

[0081] After a target output value is determined, the power electronic converter outputs a value near that target value. The target output value is typically input by the operator through a display interface on a screen connected to the terminal signal.

[0082] The power electronic converter may contain an ambient temperature sampling unit. The main component of this unit is a temperature sensor, which collects the internal ambient temperature of the power electronic converter in real time and sends it to the terminal. Upon receiving the internal ambient temperature data, the terminal sends a measurement command to the output measuring device, typically a multimeter.

[0083] Of course, sampling and measurement commands can also be set in advance. When the ambient temperature sampling unit samples the temperature, the output measuring device also outputs the measurement.

[0084] Step 2012: When sampling an internal ambient temperature, the output value of the power electronic converter is measured by the output measuring device to obtain the measured output value.

[0085] It should be noted that when sampling temperature, there may be cases where the temperature is the same or different at different sampling times. If the temperatures are different, the measurement output value corresponding to each temperature is recorded; if the temperatures are the same, the measurement output value of the power electronic converter corresponding to any one of the sampling temperatures can be selected, or the average of the measurement output values ​​from multiple samplings can be used as the measurement output value corresponding to the same temperature.

[0086] Step 2013: Establish the correspondence between each of the measured output values ​​and the internal ambient temperature to obtain the measured output value-temperature curve.

[0087] Steps 2011-2013 illustrate the method using one target output value as an example. For each target output value, the above method can be used to establish a curve measuring the output value versus temperature. Therefore, for a power electronic converter, there can be multiple curves measuring the output value versus temperature. For example... Figure 8 , Figure 9 and Figure 10 As shown, the curves depicting the measured output value versus temperature of the power electronic converter at target output voltages of xV, aV, and bV are presented respectively. These curves are generalized curves; for example,... Figure 8 , Figure 9 and Figure 10 The straight line shown is also an extreme case of a curve; of course, the figure is only an example for illustration.

[0088] Optionally, see Figure 5 The determination of the reference compensation amount for the power electronic converter at the current time mentioned in step 201 includes the following steps:

[0089] Step 2014: Obtain the current internal ambient temperature of the power electronic converter.

[0090] As can be seen from the above, the internal ambient temperature can be collected by the ambient temperature sampling unit and then sent to the terminal.

[0091] Step 2015: Obtain the sampled output value at the current time and determine the target output value corresponding to the sampled output value.

[0092] The target output value can be determined by approximating the sampled output value. For example, if the sampled output value is 201V, then the corresponding target output value is determined to be 200V.

[0093] Step 2016: Determine the measurement output value-temperature curve that matches the target output value.

[0094] Search for the measurement output value that is basically close to the target output value among all the measurement output value-temperature curves. The curve corresponding to the measurement output value that is basically close to the target output value is the measurement output value-temperature curve that matches the target output value.

[0095] Step 2017: From the matched measurement output value-temperature curve, query the measurement output value and reference output value corresponding to the internal ambient temperature.

[0096] Step 2018: Determine the difference between the queried measured output value and the reference output value to obtain the reference compensation amount.

[0097] Figures 8-10 In this context, Tn represents the reference ambient temperature, and Un represents the reference output value obtained through measurement.

[0098] Tn is a manually set value, usually an empirical value. For example, when a power electronic converter is working, its internal temperature is usually around 25 degrees Celsius, so 25 degrees Celsius is determined as the reference ambient temperature value.

[0099] Furthermore, the parameter ring temperature and reference output value may differ for different target output values.

[0100] Step 202: Based on the reference compensation amount, calibrate the expected output value and the sampled output value to obtain the new expected output value and the actual output value.

[0101] The expected output value is set manually and is the value that the power electronic converter is expected to output.

[0102] The reference compensation value can be used to calibrate the sampled output value to obtain the actual output value.

[0103] The reference compensation value can also be used to calibrate the expected output value, obtain a new expected output value, and use the new expected output value to participate in the process of step 203.

[0104] Additionally, it should be noted that since both the expected output value and the actual output value need to be involved in determining the output compensation value in step 203, the reference compensation amount can only be used to calibrate either the expected output value or the sampled output value, and cannot be calibrated repeatedly.

[0105] Furthermore, as mentioned in step 201, the reference compensation amount may include, but is not limited to, sampling error, which is the difference between the measured output value and the sampled output value. However, when the actual output value of the power electronic converter needs to be obtained, it cannot be achieved by simply adding or subtracting the sampled output value and the measured output value. This is because the reference compensation amount may be affected by other unknown reasons, and the measured output value may not be the true actual output value. Moreover, in practical applications, it is impossible to always install a measuring device for measuring the output value at the output end of the power electronic converter. Therefore, in practical applications, it is necessary to calibrate the sampled output value using the reference compensation amount to obtain the actual output value of the power electronic converter.

[0106] Optionally, see Figure 1 When the reference compensation value is used to calibrate the sampled output value, the expected output value is the preset expected output value, and no calibration is required. Further, see... Figure 6 In this case, the actual output value in step 202 can be achieved through the following steps:

[0107] Step 2021: Based on the reference compensation amount and the sampled output value, fit the first actual output value-sampled output value curve of the power electronic converter. The first actual output value-sampled output value curve is a curve with the sampled output value and the reference compensation amount as independent variables and the actual output value as the dependent variable.

[0108] The fitting process of the curve between the first actual output value and the sampled output value can be completed in advance and can be obtained directly when used.

[0109] Optionally, the fitting method generally includes single-point method, two-point method, three-point method, or any other form that makes the sampled output value (or control output value) infinitely close to the target output value. This application does not limit this. This application uses the two-point method and output voltage as an example for illustrative explanation. The process is as follows:

[0110] Choose two UT curves, assuming they are UT curves for aV and bV respectively;

[0111] The output of the power electronic converter is adjusted so that the power electronic converter outputs a voltage with aV as the target output value. The sampling output value at this time is sampled by the sampling circuit and recorded as Vsampa. The internal ambient temperature at this time is sampled by the internal ambient temperature sampling unit and recorded as Ta. The output voltage is measured by an external precision voltmeter and the measured output voltage is recorded as Vtruea.

[0112] The output of the power electronic converter is adjusted so that the power electronic converter outputs a voltage with bV as the target output value. The sampling output value at this time is sampled by the sampling circuit and recorded as Vsampb. The internal ambient temperature at this time is sampled by the internal ambient temperature sampling unit and recorded as Tb. The output voltage is measured by an external precision voltmeter and the measured output voltage is recorded as Vtrueb.

[0113] The reference compensation amount ΔUa is calculated from the UT curve of aV, where ΔUa = U Ta -Un a ;

[0114] The reference compensation amount ΔUb is calculated using the UT curve of bV, where ΔUb = U Tb -Un b ;

[0115] Based on the principle of calibrating the insufficiently accurate sampled output value to the measured output value, the coefficients k1 and b1 are calculated by the following formulas (1) and (2), that is, the first actual output value-sampled output value curve is fitted, which is also the formula (3) denoted as the first Vtrue-Vsamp curve.

[0116] Vtruea=k1(Vsampa+ΔUa)+b1 (1)

[0117] Vtrueb=k1(Vsampb+ΔUb)+b1 (2)

[0118] Vtrue=k1(Vsamp+ΔUx)+b1 (3)

[0119] Where Vsamp is the sampled output value at the current time, ΔUx is the reference compensation amount corresponding to the current time, and Vtrue is the actual output value at the current time obtained after calibrating Vsamp.

[0120] Step 2022: Based on the sampled output value, the reference compensation amount, and the first actual output value-sampled output value curve, solve for the actual output value.

[0121] Step 2022 can be: substituting the sampled output value and the reference compensation amount into the first actual output value-sampled output value curve to solve for the actual output value.

[0122] Additionally, see Figure 2 When the reference compensation is used to calibrate the expected output value, the new expected output value is the sum of the preset expected output value and the reference compensation, i.e., Vref2 = Vref1 + ΔUx. Further, see... Figure 7 In this case, the actual output value in step 202 can be achieved through the following steps:

[0123] Step 2023: Based on the sampled output value, fit the second actual output value-sampled output value curve of the power electronic converter. The second actual output value-sampled output value curve is a curve with the sampled output value as the independent variable and the actual output value as the dependent variable.

[0124] Step 2023 is similar to step 2021, except that the reference compensation amount is not involved in the process of fitting the curve. In this case, the second actual output value-sampled output value curve can be fitted by the following formulas (4) and (5). The fitting process is similar to the fitting process described above, and will not be described in detail here. After calculating the coefficients k2 and b2, the second actual output value-sampled output value curve is fitted, which is formula (6), and is denoted as the second Vtrue-Vsamp curve.

[0125] Vtruea=k2(Vsampa)+b2 (4)

[0126] Vtrueb=k2(Vsampb)+b2 (5)

[0127] Vtrue=k2(Vsamp)+b2 (6)

[0128] Where Vsamp is the sampled output value at the current time, and Vtrue is the corrected actual output value at the current time.

[0129] Step 2024: Based on the sampled output value and the second actual output value-sampled output value curve, solve for the actual output value.

[0130] Step 2024 can be: substituting the sampled output value into the second actual output value-sampled output value curve to solve for the actual output value.

[0131] After obtaining the expected and actual output values ​​using the two methods described above, see [link to relevant documentation]. Figure 1 and Figure 2The expected output value and the actual output value are used as variables in the loop control, thereby realizing the dynamic adjustment of the output compensation value and improving the output accuracy of the power electronic converter through this adjustment method.

[0132] Step 203: Send the new expected output value and the actual output value to the calculation module so that the calculation module can determine the output compensation value based on the expected output value and the actual output value.

[0133] The output compensation value is the difference between the expected output value (Vref in the figure) and the actual output value. Therefore, the process by which the calculation module determines the output compensation value can be as follows: perform a difference calculation between the new expected output value and the actual output value to obtain the output compensation value.

[0134] Once the calculation module determines the output compensation value, it sends the output compensation value to... Figure 1 and Figure 2 The control module shown can determine how to regulate the output of the power electronic converter based on the output compensation value.

[0135] Furthermore, adjusting the output circuit of the power electronic converter based on the actual output value includes:

[0136] When the output compensation value is positive, the output of the power electronic converter is increased.

[0137] When the output compensation value is negative, the output of the power electronic converter is reduced.

[0138] When the control module adjusts the output of the power electronic converter according to the output compensation value, it can make the output of the power electronic converter continuously approach the expected output and achieve the desired output.

[0139] Furthermore, the control module can adjust the output circuit of the power electronic converter to make the actual output value of the power electronic converter approach the expected output value.

[0140] Furthermore, the control module can send adjustment commands to the wave generation module. These commands typically involve increasing or decreasing the positive-to-negative ratio. Increasing the positive-to-negative ratio increases the output of the power electronic converter, while decreasing it decreases the output.

[0141] In addition, as explained in step 1, step 201 is executed once every first preset time interval, that is, step 201-203 is executed once every first preset time interval, that is, the output compensation value is dynamically adjusted once every first preset time interval, and the output circuit is adjusted once every first preset time interval according to the output compensation value to achieve the purpose of real-time control.

[0142] The ambient temperature adaptive output compensation method for power electronic converters provided in this application determines a reference compensation amount and a sampled output value for the power electronic converter. The reference compensation amount includes, but is not limited to, the discreteness of electronic components in the sampling circuit and the sampling error caused by temperature changes in the environment. Based on the reference compensation amount and the sampled output value, an output compensation value is determined, thereby adjusting the actual output of the power electronic converter according to the output compensation value. Compared to existing technologies that do not consider the sampling error caused by temperature changes in the environment of the electronic components in the sampling circuit, the dynamic adjustment method for output compensation value provided in this application improves the accuracy of the output compensation value of the power electronic converter, thereby also contributing to improving the output accuracy of the power electronic converter.

[0143] Figure 11 This is a block diagram of an ambient temperature adaptive output compensation device for a power electronic converter according to an embodiment of this application. The adjustment device can be arranged in... Figure 1 Within the calibration unit shown. (As indicated) Figure 11 As shown, the device includes:

[0144] The determination module 901 is used to determine the reference compensation amount of the power electronic converter at each first preset time interval. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter.

[0145] The calibration module 902 is used to calibrate the expected output value and the sampled output value of the power electronic converter based on the reference compensation amount, so as to obtain new expected output value and actual output value respectively.

[0146] The sending module 903 is used to send the new expected output value and the actual output value to the calculation module, so that the calculation module determines the output compensation value based on the expected output value and the actual output value, and the output compensation value is used by the control module to regulate the output of the power electronic conversion device.

[0147] Optionally, the power electronic conversion device includes multiple target output values, and each target output value corresponds to a measured output value-temperature curve. The determining module 901 is further used for:

[0148] Obtain the current internal ambient temperature of the power electronic converter;

[0149] Obtain the sampled output value at the current time, and determine the target output value corresponding to the sampled output value;

[0150] Determine a measurement output value-temperature curve that matches the target output value. The measurement output value-temperature curve is a curve showing different measurement output values ​​and internal ambient temperature when the output of the power electronic converter is centered on the target output value.

[0151] From the matched measurement output value-temperature curve, query the measurement output value and reference output value corresponding to the internal ambient temperature;

[0152] The difference between the measured output value and the reference output value is determined to obtain the reference compensation amount.

[0153] Optionally, the calibration module 902 is also used for:

[0154] Based on the reference compensation amount and the sampled output value, a first actual output value-sampled output value curve of the power electronic converter is fitted. The first actual output value-sampled output value curve is a curve with the sampled output value and the reference compensation amount as independent variables and the actual output value as the dependent variable.

[0155] The actual output value is calculated based on the sampled output value, the reference compensation amount, and the first actual output value-sampled output value curve.

[0156] Optionally, the determining module 901 is further configured to:

[0157] At every second preset time interval, the internal ambient temperature of the power electronic converter is sampled by the ambient temperature sampling unit;

[0158] When sampling an internal ambient temperature, the output value of the power electronic converter is measured by the output measuring device to obtain the measured output value;

[0159] Establish the correspondence between each of the measured output values ​​and the internal ambient temperature to obtain the curve of the measured output value-temperature.

[0160] Optionally, the device further includes a computing module for:

[0161] The difference between the new expected output value and the actual output value is calculated to obtain the output compensation value;

[0162] Optionally, see Figure 12 The device also includes a control module 904 for:

[0163] When the output compensation value is positive, the output of the power electronic converter is increased.

[0164] When the output compensation value is negative, the output of the power electronic converter is reduced.

[0165] Optionally, the power electronic conversion device is a charging pile.

[0166] Additionally, it should be noted that the relevant content in the device embodiment is described in the method embodiment, and will not be repeated here.

[0167] Figure 13 This is a schematic diagram illustrating the structure of a computer system 1100 according to an embodiment of this application. The computer system includes a central processing unit (CPU) 1101, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1102 or a program loaded from a storage portion into a random access memory (RAM) 1103. The RAM 1103 also stores various programs and data required for system operation. The CPU 1101, ROM 1102, and RAM 1103 are interconnected via a bus 1104. An input / output (I / O) interface 1105 is also connected to the bus 1104.

[0168] The following components are connected to I / O interface 1105: an input section 1106 including a keyboard, mouse, etc.; an output section including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1108 including a hard disk, etc.; and a communication section 1109 including a network interface card such as a LAN card, modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive is also connected to I / O interface 1105 as needed. Removable media 1111, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1110 as needed so that computer programs read from it can be installed into storage section 1108 as needed.

[0169] Specifically, the processes described in the flowcharts of the embodiments of this application can be implemented as computer software programs. For example, the method embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by the central processing unit (CPU) 1101, it performs the functions defined in the system of this application.

[0170] It should be noted that the computer-readable medium shown in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0171] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0172] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself. The described units or modules can also be located in a processor. The names of these units or modules do not necessarily limit the specific unit or module itself.

[0173] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to implement the ambient temperature adaptive output compensation method for the power electronic converter as described in the above embodiments.

[0174] Finally, it should be noted that any content not described in the technical solutions of this application can be implemented using existing technology. Furthermore, the above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for adaptive output compensation based on ambient temperature in a power electronic converter, characterized in that, include: At each first preset time interval, the reference compensation amount of the power electronic converter is determined for the current time. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter. Based on the reference compensation amount, the expected output value and sampled output value of the power electronic converter are calibrated to obtain new expected output value and actual output value, respectively. The new expected output value and the actual output value are sent to the computing module so that the computing module determines an output compensation value based on the expected output value and the actual output value. The output compensation value is used by the control module to regulate the output of the power electronic converter. The power electronic converter includes multiple target output values, and each target output value corresponds to a measured output value-temperature curve. Determining the reference compensation amount for the power electronic converter at the current time includes: Obtain the current internal ambient temperature of the power electronic converter; Obtain the sampled output value at the current time, and determine the target output value corresponding to the sampled output value; Determine a measurement output value-temperature curve that matches the target output value. The measurement output value-temperature curve is a curve showing different measurement output values ​​and internal ambient temperature when the output of the power electronic converter is centered on the target output value. From the matched measurement output value-temperature curve, query the measurement output value and reference output value corresponding to the internal ambient temperature; The difference between the measured output value and the reference output value is determined to obtain the reference compensation amount.

2. The ambient temperature adaptive output compensation method according to claim 1, characterized in that, The process of calibrating the sampled output value based on the reference compensation amount to obtain the actual output value of the power electronic converter includes: Based on the reference compensation amount and the sampled output value, a first actual output value-sampled output value curve of the power electronic converter is fitted. The first actual output value-sampled output value curve is a curve with the sampled output value and the reference compensation amount as independent variables and the actual output value as the dependent variable. The actual output value is calculated based on the sampled output value, the reference compensation amount, and the first actual output value-sampled output value curve.

3. The ambient temperature adaptive output compensation method according to claim 1, characterized in that, For each target output value, its measured output value-temperature curve is determined using the following method: At every second preset time interval, the internal ambient temperature of the power electronic converter is sampled by the ambient temperature sampling unit; When sampling an internal ambient temperature, the output value of the power electronic converter is measured by the output measuring device to obtain the measured output value; Establish the correspondence between each of the measured output values ​​and the internal ambient temperature to obtain the measured output value-temperature curve.

4. The ambient temperature adaptive output compensation method according to any one of claims 1-3, characterized in that, The calculation module determines the output compensation value based on the new expected output value and the actual output value, including: The expected output value and the actual output value are compared to obtain the output compensation value.

5. The ambient temperature adaptive output compensation method according to claim 4, characterized in that, The control module regulates the output of the power electronic converter, including: When the output compensation value is positive, the output of the power electronic converter is increased. When the output compensation value is negative, the output of the power electronic converter is reduced.

6. The ambient temperature adaptive output compensation method according to claim 5, characterized in that, The power electronic conversion device is a charging pile.

7. An ambient temperature adaptive output compensation device for a power electronic converter, characterized in that, include: The determination module is used to determine the reference compensation amount of the power electronic converter at each first preset time interval. The reference compensation amount is the difference between the measured output value under the actual ambient temperature value and the measured output value under the reference ambient temperature value during the process of measuring the output value of the power electronic converter. The calibration module is used to calibrate the expected output value or sampled output value of the power electronic converter based on the reference compensation amount, so as to obtain a new expected output value or actual output value respectively. The sending module is used to send the expected output value and the actual output value to the calculation module, so that the calculation module determines the output compensation value based on the expected output value and the actual output value, and the output compensation value is used by the control module to regulate the output of the power electronic conversion device; The power electronic converter includes multiple target output values, and each target output value corresponds to a measured output value-temperature curve. The determining module is further configured to: acquire the internal ambient temperature of the power electronic converter at the current time; acquire the sampled output value at the current time and determine the target output value corresponding to the sampled output value; determine the measured output value-temperature curve matching the target output value, wherein the measured output value-temperature curve is the curve of different measured output values ​​and internal ambient temperature when the output of the power electronic converter is centered on the target output value; and query the measured output value and reference output value corresponding to the internal ambient temperature from the matched measured output value-temperature curves. The difference between the measured output value and the reference output value is determined to obtain the reference compensation amount.

8. An electronic device, characterized in that, The device includes: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, It stores a computer program that is used for: When the computer program is executed by a processor, it implements the method as described in any one of claims 1-6.

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