CN117970209A - Processing method and device for current test data of single-phase four-quadrant PWM converter - Google Patents
Processing method and device for current test data of single-phase four-quadrant PWM converter Download PDFInfo
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The application belongs to the technical field of alternating current and direct current measurement, and particularly relates to a method and a device for processing current test data of a single-phase four-quadrant PWM converter, wherein the method comprises the following steps: acquiring current test data of a direct current side of a single-phase four-quadrant PWM converter measured by a Rogowski coil probe; calibrating the current test data, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data. The application can reconstruct the current test data of the direct current side of the single-phase four-quadrant PWM converter and accurately restore the current of the direct current side of the single-phase four-quadrant PWM converter.
Description
Technical Field
The invention belongs to the technical field of AC/DC measurement, and particularly relates to a method and a device for processing current test data of a single-phase four-quadrant PWM converter.
Background
The single-phase four-quadrant PWM (pulse width modulation ) converter is a key component of power electronic systems such as an electric locomotive, a high-speed motor train and high-power electric transmission, and as shown in a simplified main circuit diagram of the electric locomotive and the high-speed motor train in fig. 1, the direct current voltages of the electric locomotive and the high-speed motor train which are commonly used are 1800V and 3600V.
In order to reduce the influence on the power grid and realize the bidirectional energy circulation, the power grid side PWM converter adopts a single-phase four-quadrant PWM converter structure, and the main circuit structure of the single-phase four-quadrant PWM converter is shown in figure 2. The single-phase four-quadrant PWM converter is generally connected with the direct current link by adopting a low-inductance busbar. The direct-current side current of the single-phase four-quadrant PWM converter is alternating-current and direct-current, frequency components are distributed in the range from Direct Current (DC) to MHz, the current is from a few amperes to thousands of amperes, and the direct-current link current needs to be tested during the design, debugging and operation of the PWM converter. For direct current side current test of the single-phase four-quadrant PWM converter, the current test probe is required to be in a flexible and openable structural form so as to adapt to current measurement in a wide low-inductance busbar and other connection modes, the current test probe is required to provide electrical isolation so as to ensure safety of test equipment and personnel, the test equipment is required to realize measurement in a direct current-to-MHz range, and the measurement range of the test equipment can reach more than thousands of amperes so as to meet direct current test and alternating current-direct current test requirements of the single-phase four-quadrant PWM converter.
Disclosure of Invention
In order to solve the technical problem of accurately testing the direct current side current of the single-phase four-quadrant PWM converter, the application provides a processing method and a processing device for the current test data of the single-phase four-quadrant PWM converter, which can meet the test requirement of the direct current side current of the single-phase four-quadrant PWM converter and accurately obtain the direct current side current of the single-phase four-quadrant PWM converter.
The application provides a processing method of current test data of a single-phase four-quadrant PWM converter, which comprises the following steps:
Acquiring current test data of a direct current side of the single-phase four-quadrant PWM converter, wherein the current test data is current data of a direct current bus of the single-phase four-quadrant PWM converter measured by a Rogowski coil probe;
Calibrating the current test data, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
In some embodiments, calibrating the current test data includes:
setting time length parameters corresponding to two working conditions of the single-phase four-quadrant PWM converter, wherein the two working conditions comprise an inversion working condition and a rectification working condition, and the time length parameters comprise a first time length parameter and a second time length parameter;
Determining a reference time point and a searching direction in the current test data according to the working condition of the single-phase four-quadrant PWM converter;
according to the reference time point, a first time length parameter is shifted to the searching direction, and a current zero point of the actual current of the single-phase four-quadrant PWM converter is determined;
selecting current data in a second duration parameter according to the current zero point and the searching direction;
determining a direct current bias of the current test data according to the selected current data;
and calibrating the current test data according to the direct current bias to obtain calibrated current test data.
In some embodiments, the correctness of the calibrated current test data is judged, if the judging result is wrong, the duration parameter is adjusted, and the current test data is calibrated again; and if the judgment result is correct, obtaining calibrated current test data.
In some embodiments, when the working condition of the single-phase four-quadrant PWM converter is an inversion working condition, the reference time point is a time point corresponding to a maximum value of the direct current in the current test data, and the search direction is forward;
When the working condition of the single-phase four-quadrant PWM converter is a rectification working condition, the reference time point is a time point corresponding to the minimum value of the direct current in the current test data, and the searching direction is backward.
In some embodiments, the determining the dc bias of the current test data from the selected current data comprises: and carrying out mean filtering on the selected current data to obtain the direct current bias of the current test data.
In some embodiments, the calibrating the current test data according to the dc bias to obtain calibrated current test data includes:
and subtracting the direct current bias from the current test data to obtain calibrated current test data.
In some embodiments, the correctness is judged according to the current value corresponding to the waveform of the calibrated current test data at the parallel time, if the absolute value of the corresponding current value is smaller than the preset threshold value, the judging result is correct; if the absolute value of the corresponding current value is larger than the preset threshold value, the judgment result is wrong.
In some embodiments, the rogowski coil probe employs an open flexible coil probe.
In some embodiments, the method further comprises:
identifying the number of current test data to be calibrated as the number of data processing times;
acquiring current test data to be calibrated;
Calibrating the current test data to be calibrated, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data to be calibrated again; if the judgment result is correct, obtaining calibrated current test data;
judging whether the number of the calibrated current test data reaches the data processing times or not;
if the judging result is not reached, acquiring new current test data to be calibrated; and if the judgment result is that the current test data to be calibrated is reached, stopping acquiring new current test data to be calibrated.
In a second aspect of the present application, there is provided a processing device for current test data of a single-phase four-quadrant PWM converter, including:
the data acquisition module is used for acquiring current test data measured by the rogowski coil probe; the current test data are current data of a direct current side and/or a direct current bus of the single-phase four-quadrant PWM converter;
the data processing module is used for calibrating the current test data, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
In a third aspect of the present application, a storage medium is provided, which stores a computer program executable by one or more processors to implement a method for processing single-phase four-quadrant PWM converter current test data as described above.
In a fourth aspect of the present application, there is provided an electronic device comprising a memory and a processor, the memory having stored thereon a computer program, the memory and the processor being communicatively coupled to each other, the computer program, when executed by the processor, implementing a method for processing single-phase four-quadrant PWM converter current test data as described above.
Compared with the prior art, the technical scheme of the application has the following advantages or beneficial effects:
1. The application adopts the Rogowski coil probe to measure the current of the direct current side of the single-phase four-quadrant PWM converter, and the Rogowski coil is used for isolation measurement, the current measurement range can cover hundreds of kiloamperes, and the test frequency range can cover the range from 1Hz to 10MHz, so the application can meet the current of the direct current side of the single-phase four-quadrant PWM converter. And the rogowski coil probe can accurately measure the alternating current component of the direct current side current of the single-phase four-quadrant PWM converter. In addition, the application processes the current test data obtained by measuring the rogowski coil probe to obtain the direct current component of the current at the direct current side of the single-phase four-quadrant PWM converter, and calibrates the measured current test data according to the obtained direct current component, thereby accurately obtaining the current at the direct current side of the single-phase four-quadrant PWM converter.
2. The rogowski coil current probe adopts an open type flexible coil probe, and can be suitable for direct current side low-inductance busbar tests with different sizes and large widths.
3. The application is suitable for testing the current of the direct current side or the direct current bus under the rectification working condition and the inversion working condition of the single-phase four-quadrant PWM converter.
4. The application can conveniently process batch data and greatly improve the processing efficiency of experimental data under multi-working condition test.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a simplified main circuit diagram of an electric locomotive and a high speed motor car provided by the application;
fig. 2 is a schematic diagram of a main circuit structure of the single-phase four-quadrant PWM converter according to the present application;
Fig. 3 is a flowchart of a method for processing current test data of a single-phase four-quadrant PWM converter according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the arrangement position of the Rogowski coil current probe in DC side current test according to the present application;
fig. 5 is a waveform diagram of a dc side current test of the single-phase four-quadrant PWM converter under an inversion condition (dc side outflow);
FIG. 6 is a graph of DC side current test waveforms for a single-phase four-quadrant PWM converter during rectification (DC side in);
Fig. 7 is a flowchart of a method for processing current test data of a single-phase four-quadrant PWM converter according to an embodiment of the present application;
FIG. 8 is a waveform diagram of the current test before and after calibration of the DC side of the single-phase four-quadrant PWM converter under the inversion condition (DC side outflow);
FIG. 9 is a graph of current test waveforms before and after DC side calibration of a single-phase four-quadrant PWM converter during rectification (DC side inflow);
fig. 10 is a flowchart of a method for processing current test data of a single-phase four-quadrant PWM converter according to a second embodiment of the present application;
Fig. 11 is a block diagram of a processing device for current test data of a single-phase four-quadrant PWM converter according to a third embodiment of the present application;
Fig. 12 is a connection block diagram of an electronic device according to a fifth embodiment of the present application.
Detailed Description
The present application will be further described in detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present application more apparent, and the described embodiments should not be construed as limiting the present application, and all other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
If a similar description of "first\second\third" appears in the application document, the following description is added, in which the terms "first\second\third" are merely distinguishing between similar objects and do not represent a particular ordering of the objects, it being understood that the "first\second\third" may be interchanged in a particular order or precedence, where allowed, so that embodiments of the application described herein may be practiced in an order other than that illustrated or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.
Example 1
For direct current side current measurement of a single-phase four-quadrant PWM converter, the embodiment adopts a single Rogowski coil probe for testing. The frequency range covered by the Rogowski coil current probe can reach the measuring range of 1Hz to 10MHz, the measuring of the direct current side alternating current component of the single-phase four-quadrant PWM converter is realized by utilizing the characteristic that the frequency range covered by the Rogowski coil current probe is wide, however, the Rogowski coil current probe does not have the testing capability of the direct current component. According to the current characteristics of the direct current side of the single-phase four-quadrant PWM converter, the embodiment provides a processing method of the current test data of the single-phase four-quadrant PWM converter, and the current test data of the direct current side is reconstructed by processing the current test data of the direct current side, so that the current of the direct current side of the single-phase four-quadrant PWM converter is accurately restored.
Fig. 3 is a flowchart of a method for processing current test data of a single-phase four-quadrant PWM converter according to the first embodiment, and fig. 3 shows that the method of the embodiment includes:
And S1, acquiring current test data of a direct current side of the single-phase four-quadrant PWM converter, wherein the current test data are current data of a direct current bus of the single-phase four-quadrant PWM converter measured by a Rogowski coil probe. Fig. 4 is a schematic diagram of the arrangement position of the rogowski coil current probe during testing, and as shown in fig. 4, the embodiment adopts a single rogowski coil probe arranged on the direct current side of a single-phase four-quadrant PWM converter for testing. In another embodiment, the current test data may also be current data of a dc bus of a single-phase four-quadrant PWM converter.
In some embodiments, the rogowski coil probe adopts an open type flexible coil probe, so that the rogowski coil probe can adapt to direct current side low-inductance busbar tests with different sizes and widths.
Fig. 5 is a waveform diagram of a dc side current test of a single-phase four-quadrant PWM converter under an inversion condition (dc side current flowing), wherein the current flowing is positive; fig. 6 is a waveform diagram of a dc side current test of the single-phase four-quadrant PWM converter under a rectifying condition (dc side in), and the current flowing out is positive. As shown in fig. 5 and fig. 6, the dc side test current waveform of the single-phase four-quadrant PWM converter contains abundant harmonic content, and the rogowski coil has no dc test capability, so that the rogowski coil probe is directly used for measurement, and the waveforms of the obtained current test data have dc offsets with different magnitudes. The waveforms of the current test data are kept parallel, the corresponding PWM converter upper tube is turned off, the direct current is 0 at the moment, and the actual measured current test data deviate.
Step S2, calibrating the current test data, judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
In some embodiments, as shown in fig. 7, step S2 specifically includes:
Step S21, setting time length parameters corresponding to two working conditions of the single-phase four-quadrant PWM converter, wherein the two working conditions comprise an inversion working condition and a rectification working condition, and the time length parameters comprise a first time length parameter and a second time length parameter.
The method comprises the steps of setting a corresponding time length parameter when the working condition of the single-phase four-quadrant PWM converter is an inversion working condition, wherein the time length parameter comprises a first time length parameter A and a second time length parameter B; setting the working condition of the single-phase four-quadrant PWM converter as a corresponding time length parameter when the working condition is a rectification working condition, wherein the time length parameter comprises a first time length parameter X and a second time length parameter Y. The setting range of the first time length parameters A and X is 1-5uS, and the setting range of the second time length parameters B and Y is 1-30uS.
And S22, determining a reference time point and a search direction in the current test data according to the working condition of the single-phase four-quadrant PWM converter. In some embodiments, when the working condition of the single-phase four-quadrant PWM converter is an inversion working condition, the reference time point is a time point corresponding to a maximum value of the direct current in the current test data, and the search direction is forward, i.e. the right side of fig. 5; when the working condition of the single-phase four-quadrant PWM converter is the rectifying working condition, the reference time point is the time point corresponding to the minimum value of the direct current in the current test data, and the searching direction is backward, namely, the left side of the figure 6.
And S23, determining a current zero point of the actual current of the single-phase four-quadrant PWM converter according to the first time length parameter shifted to the searching direction at the reference time point. The purpose here is to determine the point in time when the waveform of the current test data is at parallel moments, i.e. corresponding to the tube-off on the PWM converter, and the dc current on the dc side of the actual single-phase four-quadrant PWM converter is 0.
And step S24, selecting current data in a second duration parameter according to the current zero point to the searching direction.
And S25, determining the direct current bias of the current test data according to the selected current data. Specifically, average filtering is performed on the selected current data to obtain the direct current bias of the current test data.
And step S26, calibrating the current test data according to the direct current bias to obtain calibrated current test data. Specifically, the current test data is subtracted from the direct current bias to obtain calibrated current test data.
Step S27, judging the correctness of the calibrated current test data, and if the judging result is wrong, adjusting the duration parameter, and calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data. Specifically, judging the correctness according to the current value corresponding to the waveform of the calibrated current test data at the parallel moment, and if the absolute value of the corresponding current value is smaller than a preset threshold value, judging the result to be correct; if the absolute value of the corresponding current value is larger than the preset threshold value, the judgment result is wrong. The threshold is set according to the measurement noise.
After the calibration processing is performed on the current test data corresponding to fig. 5 and 6 by using the method of the embodiment, the calibrated current test data is shown in fig. 8 and 9.
In the embodiment, the current of the direct current side of the single-phase four-quadrant PWM converter is measured by adopting the Rogowski coil probe, and the current measuring range can cover hundreds of kiloamperes and the testing frequency range can cover the range from 1Hz to 10MHz because the Rogowski coil is used for isolation measurement, so that the current of the direct current side of the single-phase four-quadrant PWM converter can be met. And the rogowski coil probe can accurately measure the alternating current component of the direct current side current of the single-phase four-quadrant PWM converter. In addition, the application processes the current test data obtained by measuring the rogowski coil probe to obtain the direct current component of the current at the direct current side of the single-phase four-quadrant PWM converter, and calibrates the measured current test data according to the obtained direct current component, thereby accurately obtaining the current at the direct current side of the single-phase four-quadrant PWM converter. In addition, the embodiment carries out targeted data processing on the current obtained by testing under two working conditions of the single-phase four-quadrant PWM converter, so that the method can be suitable for testing the current of a direct current side or a direct current bus under the rectification working condition and the inversion working condition of the single-phase four-quadrant PWM converter.
Example two
The embodiment provides a method for processing current test data of a single-phase four-quadrant PWM converter, as shown in fig. 10, including:
step S1, the number of current test data to be calibrated is identified as the data processing times.
For example, the current test data to be calibrated is placed in a folder, and the current test data in the folder is automatically identified as the number of data processing times.
And S2, acquiring current test data to be calibrated.
Illustratively, current test data to be calibrated is read from the folder.
Step S3, calibrating the current test data to be calibrated, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data to be calibrated again; and if the judgment result is correct, obtaining calibrated current test data.
Step S4, judging whether the number of the calibrated current test data reaches the data processing times or not; if the judging result is not reached, acquiring new current test data to be calibrated; and if the judgment result is that the current test data to be calibrated is reached, stopping acquiring new current test data to be calibrated.
Compared with the first embodiment, the method provided by the present embodiment has the following additional advantages or beneficial effects: the batch data processing can be conveniently carried out, and the processing efficiency of experimental data under the multi-station test is greatly improved.
The process of the specific embodiment of the steps of the method described above can be found in embodiment one, which is not repeated here.
Example III
The present embodiment provides a device 300 for processing current test data of a single-phase four-quadrant PWM converter, which may be used to execute the method embodiment of the present application, and for details not disclosed in the device embodiment, please refer to the method embodiment of the present application. Fig. 11 is a block diagram of a processing device for current test data of a single-phase four-quadrant PWM converter according to an embodiment of the present application, and as shown in fig. 11, a device 300 provided in this embodiment includes:
The data acquisition module 310 is configured to acquire current test data of the dc side of the single-phase four-quadrant PWM converter. The current test data are current data of a direct current bus of the single-phase four-quadrant PWM converter measured by the Rogowski coil probe. In some embodiments, the data acquisition module 310 is an oscilloscope or a data acquisition instrument.
The data processing module 320 is configured to calibrate the current test data, then determine correctness of the calibrated current test data, and if the determination result is wrong, calibrate the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
In some embodiments, the apparatus 300 further comprises:
the counting module 330 is configured to identify the number of current test data to be calibrated as the number of data processing times, and count the number of current test data after calibration has been obtained.
A judging module 340, configured to judge whether the number of the calibrated current test data reaches the number of data processing times; if the judging result is not reached, a data acquisition instruction is sent to a data acquisition module, and new current test data to be calibrated are acquired.
In the embodiment, the current of the direct current side of the single-phase four-quadrant PWM converter is measured by adopting the Rogowski coil probe, and the current measuring range can cover hundreds of kiloamperes and the testing frequency range can cover the range from 1Hz to 10MHz because the Rogowski coil is used for isolation measurement, so that the current of the direct current side of the single-phase four-quadrant PWM converter can be met. And the rogowski coil probe can accurately measure the alternating current component of the direct current side current of the single-phase four-quadrant PWM converter. In addition, the embodiment carries out targeted data processing on the current obtained by testing under two working conditions of the single-phase four-quadrant PWM converter, so that the method can be suitable for testing the current of a direct current side or a direct current bus under the rectification working condition and the inversion working condition of the single-phase four-quadrant PWM converter. In addition, the application processes the current test data obtained by measuring the rogowski coil probe to obtain the direct current component of the current at the direct current side of the single-phase four-quadrant PWM converter, and calibrates the measured current test data according to the obtained direct current component, thereby accurately obtaining the current at the direct current side of the single-phase four-quadrant PWM converter. In addition, the technical scheme of the embodiment can also very conveniently process batch data, and greatly improve the processing efficiency of experimental data under multi-working condition test.
Example IV
The present embodiment also provides a computer storage medium, in which a computer program is stored, where the computer program may implement the steps of the method in the above embodiment when executed by a processor, and the detailed description of the embodiment is not repeated here.
The computer-readable storage medium may also include, among other things, computer programs, data files, data structures, etc., alone or in combination. The computer readable storage medium or computer program may be specifically designed and understood by those skilled in the art of computer software, or the computer readable storage medium may be well known and available to those skilled in the art of computer software. Examples of the computer readable storage medium include: magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CDROM discs and DVDs; magneto-optical media, such as optical disks; and hardware means, specifically configured to store and execute computer programs, such as read-only memory (ROM), random Access Memory (RAM), flash memory; or a server, app application mall, etc. Examples of computer programs include machine code (e.g., code produced by a compiler) and files containing higher level code that may be executed by the computer using an interpreter. The described hardware devices may be configured to act as one or more software modules to perform the operations and methods described above, and vice versa. In addition, the computer readable storage medium may be distributed among networked computer systems, and the program code or computer program may be stored and executed in a decentralized manner.
Example five
Fig. 12 is a connection block diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 12, the electronic device 400 may include: one or more processors 410, memory 420, multimedia components 430, input/output (I/O) interfaces 440, and communication components 450.
Wherein the processor 410 is configured to perform all or part of the steps of the method as in embodiment one. The memory 420 is used to store various types of data, which may include, for example, instructions for any application or method in the electronic device, as well as application-related data.
The Processor 410 may be an Application SPECIFIC INTEGRATED Circuit (ASIC), a digital signal Processor (DIGITAL SIGNAL Processor, DSP), a digital signal processing device (DIGITAL SIGNAL Processing Device, DSPD), a programmable logic device (Programmable Logic Device, PLD), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), a controller, a microcontroller, a microprocessor, or other electronic component implementation for performing the methods in the above embodiments.
The Memory 420 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk.
The multimedia component 430 may include a screen, which may be a touch screen, and an audio component for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in a memory or transmitted through a communication component. The audio assembly further comprises at least one speaker for outputting audio signals.
The I/O interface 440 provides an interface between the processor 410 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.
The communication component 450 is used for wired or wireless communication between the electronic device 400 and other devices.
The wired communication comprises communication through a network port, a serial port and the like; the wireless communication includes: wi-Fi, bluetooth, near Field Communication (NFC), 2G, 3G, 4G, 5G, or a combination of one or more of them. The corresponding communication component 450 may thus comprise: wi-Fi module, bluetooth module, NFC module.
It should be further understood that the methods and systems disclosed in the embodiments of the present application may be implemented in other manners. The above-described method or system embodiments are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and apparatus according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, a computer program segment, or a portion of a computer program, which comprises one or more computer programs for implementing the specified logical function(s).
It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures, and in fact may be executed substantially concurrently, or in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer programs.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, apparatus or device that comprises such elements; if any, the terms "first," "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of features indicated or implicitly indicating the precedence of features indicated; in the description of the present application, unless otherwise indicated, the terms "plurality", "multiple" and "multiple" mean at least two; if the description is to a server, it should be noted that the server may be an independent physical server or terminal, or may be a server cluster formed by a plurality of physical servers, or may be a cloud server capable of providing basic cloud computing services such as a cloud server, a cloud database, a cloud storage, a CDN, and the like; in the present application, if an intelligent terminal or a mobile device is described, it should be noted that the intelligent terminal or the mobile device may be a mobile phone, a tablet computer, a smart watch, a netbook, a wearable electronic device, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), an augmented Reality device (Augmented Reality, AR), a Virtual Reality device (VR), a smart television, a smart stereo, a Personal computer (Personal Computer, PC), etc., but the present application is not limited thereto, and the specific form of the intelligent terminal or the mobile device is not particularly limited thereto.
Finally it is pointed out that in the description of the present specification, the terms "one embodiment," "some embodiments," "example," "one example," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been illustrated and described above, it should be understood that the above embodiments are illustrative and that the present application is not limited to the embodiments described above for the purpose of facilitating understanding of the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the present disclosure as defined by the appended claims.
Claims (12)
1. The processing method of the current test data of the single-phase four-quadrant PWM converter is characterized by comprising the following steps of:
Acquiring current test data of a direct current side of the single-phase four-quadrant PWM converter, wherein the current test data is current data of a direct current bus of the single-phase four-quadrant PWM converter measured by a Rogowski coil probe;
Calibrating the current test data, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
2. The method of claim 1, wherein calibrating the current test data comprises:
setting time length parameters corresponding to two working conditions of the single-phase four-quadrant PWM converter, wherein the two working conditions comprise an inversion working condition and a rectification working condition, and the time length parameters comprise a first time length parameter and a second time length parameter;
Determining a reference time point and a searching direction in the current test data according to the working condition of the single-phase four-quadrant PWM converter;
according to the reference time point, a first time length parameter is shifted to the searching direction, and a current zero point of the actual current of the single-phase four-quadrant PWM converter is determined;
selecting current data in a second duration parameter according to the current zero point and the searching direction;
determining a direct current bias of the current test data according to the selected current data;
and calibrating the current test data according to the direct current bias to obtain calibrated current test data.
3. The method according to claim 2, wherein the correctness of the calibrated current test data is judged, if the judging result is wrong, the duration parameter is adjusted, and the current test data is calibrated again; and if the judgment result is correct, obtaining calibrated current test data.
4. The method according to claim 2, wherein when the working condition of the single-phase four-quadrant PWM converter is an inversion working condition, the reference time point is a time point corresponding to a maximum value of the direct current in the current test data, and the search direction is forward;
When the working condition of the single-phase four-quadrant PWM converter is a rectification working condition, the reference time point is a time point corresponding to the minimum value of the direct current in the current test data, and the searching direction is backward.
5. The method of claim 2, wherein determining the dc bias of the current test data from the selected current data comprises: and carrying out mean filtering on the selected current data to obtain the direct current bias of the current test data.
6. The method of claim 2, wherein calibrating the current test data according to the dc bias results in calibrated current test data, comprising:
and subtracting the direct current bias from the current test data to obtain calibrated current test data.
7. The method according to claim 2, wherein the correctness is judged according to the current value corresponding to the waveform of the calibrated current test data at the parallel time, and if the absolute value of the corresponding current value is smaller than the preset threshold value, the judgment result is correct; if the absolute value of the corresponding current value is larger than the preset threshold value, the judgment result is wrong.
8. The method of claim 2, wherein the rogowski coil probe employs an open flexible coil probe.
9. The method according to claim 1, wherein the method further comprises:
identifying the number of current test data to be calibrated as the number of data processing times;
acquiring current test data to be calibrated;
Calibrating the current test data to be calibrated, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data to be calibrated again; if the judgment result is correct, obtaining calibrated current test data;
judging whether the number of the calibrated current test data reaches the data processing times or not;
if the judging result is not reached, acquiring new current test data to be calibrated; and if the judgment result is that the current test data to be calibrated is reached, stopping acquiring new current test data to be calibrated.
10. A processing device for current test data of a single-phase four-quadrant PWM converter, comprising:
the data acquisition module is used for acquiring current test data measured by the rogowski coil probe; the current test data are current data of a direct current side and/or a direct current bus of the single-phase four-quadrant PWM converter;
the data processing module is used for calibrating the current test data, then judging the correctness of the calibrated current test data, and if the judgment result is wrong, calibrating the current test data again; and if the judgment result is correct, obtaining calibrated current test data.
11. A computer storage medium storing a computer program which, when executed by one or more processors, implements a method of processing single-phase four-quadrant PWM converter current test data according to any one of claims 1 to 9.
12. An electronic device comprising a memory and one or more processors, the memory having stored thereon a computer program, the memory and the processors being communicatively coupled to each other, the computer program, when executed by the processors, performing the method of processing single-phase four-quadrant PWM converter current test data according to any one of claims 1-9.
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| CN202211305182.4A CN117970209A (en) | 2022-10-24 | 2022-10-24 | Processing method and device for current test data of single-phase four-quadrant PWM converter |
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