CN113484714A - Current transformer test platform and test method - Google Patents
Current transformer test platform and test method Download PDFInfo
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- CN113484714A CN113484714A CN202110852781.7A CN202110852781A CN113484714A CN 113484714 A CN113484714 A CN 113484714A CN 202110852781 A CN202110852781 A CN 202110852781A CN 113484714 A CN113484714 A CN 113484714A
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Abstract
The invention provides a current transformer test platform and a test method, comprising the following steps: an operation terminal configured to provide a test instruction to the control unit; the control unit is configured to provide a test signal to the tested main loop according to the test instruction; the tested main loop is configured to form a test circuit of the tested power module by the BUS BUS, the voltage sensor, the current sensor, the alternating current reactor and the tested power module, and generates test data according to the performance of the tested power module; wherein the control unit and the measured main loop are located inside the converter.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a converter testing platform and a testing method.
Background
At present, the market competition of wind power is very violent, the investment of research and development of a converter is increased by each large company, and the product is updated more frequently. In order to keep the share of the wind power market, companies also increase the investment in the development of converters. In the development process of the converter, a product needs to be tested, and whether the product is matched with a design scheme or not is verified. The test items aiming at the product are more, and the test items comprise product system test, EMC test, environmental test, white box test and IGBT power module test. Among them, an IGBT (Insulated Gate Bipolar Transistor) power module is a core component of the converter, is a main device for implementing ac/dc conversion, and is an important test object in a system white box, and requires to invest more resources for testing.
With the development trend of a converter with higher power grade, multiple parallel connections and three ANPC levels, the number of power kits in the cabinet is more and more. However, in the prior art, the testing implementation, the test circuit construction and the like of the converter are emphasized, a test platform and a test method only for a single power module are lacked, and related technologies such as mass production test, batch test, automatic test and the like are lacked, so that the development is slow in the fields of delivery test of a complete machine, pulse test of a plurality of power modules of the complete machine and the like.
Disclosure of Invention
The invention aims to provide a converter testing platform and a testing method, which are used for solving the problems that the existing converter testing lacks mass production testing, batch testing and automatic testing.
In order to solve the above technical problem, the present invention provides a current transformer testing platform, including:
an operation terminal configured to provide a test instruction to the control unit;
the control unit is configured to provide a test signal to the tested main loop according to the test instruction; and
the tested main loop is configured to form a test circuit of the tested power module by the BUS BUS, the voltage sensor, the current sensor, the alternating current reactor and the tested power module, and generates test data according to the performance of the tested power module;
wherein the control unit and the measured main loop are located inside the converter.
Optionally, in the converter testing platform, the control unit includes:
the main control board is configured to be built by a chip with data processing and program control functions so as to communicate with the operation terminal; and
and the driving board is configured to be connected with the main control board through a flat cable so as to distribute the adaptive gate-level signals to each tested power module according to the received PWM command and/or switching level sent by the main control board, and further control the on and off of each tested power module.
Optionally, in the converter test platform, a control unit and a tested main loop are separately built, or the hardware of the converter is directly used as the control unit and the tested main loop;
the operation terminal is a personal computer and is connected with the control unit of the converter through a network cable;
after the operation terminal, the control unit and the tested main loop are determined to be connected, a tester can directly perform manual operation on the converter through a personal computer, perform various tests and acquire test data.
Optionally, in the converter test platform, the connection mode and the operating principle between the control unit and the tested main loop include:
the control unit is connected with a drive board of the power suite through a flat cable, during pulse testing, after the main control board receives a test instruction, a matched PWM signal is sent to the drive board through the flat cable according to initial parameters set before testing, the initial parameters comprise pulse width and follow current time,
in the converter whole machine, a driving plate is directly fixed on the surface of a power external member, wiring holes with fixed sizes and alternating-current output copper terminals are formed in the surface and the periphery of the power external member, matched wiring holes are reserved according to the corresponding sizes and the corresponding directions of the positions of the external member terminals when the driving plate is designed, and the driving plate is directly fixedly installed on the power external member through bolts.
Optionally, in the converter test platform, power supply of the drive board is taken from the control unit through a flat cable;
after the driving board receives the matched PWM signal, the driving board generates a corresponding gate-level signal through the voltage regulating module, the isolating module and the driving resistor, and applies the gate-level signal to the ge end of the power external member to control the conduction and the disconnection of the power external member;
under the condition that BUS BUS is electrified, voltage sensors collect voltages at all places of a main circuit to be tested as test data, current sensors collect currents at all places of the main circuit to be tested as test data, the current waveforms and the voltage waveforms at the alternating current side of a power kit are observed, the test data are provided to a control unit, the control unit carries out real-time operation and judgment according to the voltages and the currents in the test data, and the current waveforms and the voltage waveforms are provided to a display interface of an operation terminal.
Optionally, in the converter test platform, the connection mode and the working principle of the tested main loop are as follows: the BUS BUS and the BUS capacitor are connected to the direct current end of the power external member;
the alternating current end of the power external member is connected to the alternating current reactor, and the outlet of the alternating current reactor is in short circuit by adopting a short circuit clamp so as to form a complete loop.
Optionally, in the converter test platform, during pulse test, the BUS is powered on first, the control unit performs pulse test after collecting BUS voltage, the personal computer sends out a test instruction, and the control unit controls the PWM pulse to be transmitted and received after receiving the test instruction, and the PWM pulse is conditioned by the drive board and then provided to the gate level of the IGBT, so that the IGBT is turned on or off;
after the current waveform and the voltage waveform collected by the control unit, a plurality of test points are generated in a discrete mode and compared with the envelope of the standard waveform, if each test point is in the envelope, the pulse test is passed, the IGBT has a complete function, the waveform and the result are output, and the pulse test of the single IGBT is completed.
The invention also provides a testing method based on the converter testing platform, and the automatic pulse testing method of the multiple power kits comprises the following steps:
preparing, carrying out short circuit on the output end of the alternating current reactor, connecting the personal computer, the control unit and the tested main loop, and configuring test parameters, wherein the test parameters comprise pulse time, pulse number and follow current time; testing on the converter complete machine, if the AC/DC source can be powered, enabling the bus to be powered in an AC/DC pre-charging mode, or enabling the bus to be powered in a direct-current high-voltage source direct connection mode;
after the tester checks that the test is correct, the upper computer sends out a test instruction to start the automatic pulse test: after receiving the test instruction, the main control board automatically and continuously tests all the power suites according to the sequence of the programs running in the main control board;
current IGBT testing includes: the main control board provides PWM pulses, the IGBT is controlled to be switched on and off after the PWM pulses are conditioned by the driving board, voltage waveforms and current waveforms are generated after a tested loop acts, a voltage sensor acquires bus voltage and alternating current reactor end voltage, and a current sensor acquires alternating current end current of a power suite.
Optionally, in the current transformer testing method,
after the current IGBT test is finished, the main control board automatically carries out the pulse test of the next IGBT according to the sequence written by the program, and repeats the current IGBT test step until all the IGBTs are tested;
if the fault occurs, stopping the test, prompting a tester to remove the fault, and after the fault removal is finished, selecting to continue the test or retest;
and adding the stress test program of the suite, the current sharing characteristic test program and the saturation curve test program of the reactor into the corresponding test programs in advance, and synchronously carrying out the stress test of the suite, the current sharing characteristic test and the saturation curve test of the reactor in the pulse test process to serve as an additional function of the pulse test.
Optionally, in the current transformer testing method, the stress testing of the kit includes: after obtaining the bus voltage, the alternating-current side current of the power kit and the Uce voltage of the power kit, adjusting parameters of the pulse test to enable the working condition of the pulse test to be a limit condition (the most severe condition), performing the pulse test to obtain the Uce of the power kit when the maximum current is cut off at the limit bus voltage, and finishing the stress test of the power kit.
Optionally, in the current transformer testing method, the current sharing characteristic testing includes: under the same limit working condition, obtaining current data of each branch of a plurality of parallel power external member alternating current end outlets and a plurality of parallel power external member direct current end outlets, obtaining test data of current sharing characteristics, collecting and analyzing results by a main control board, generating a plurality of test points by the acquired current waveform and voltage waveform in a discrete mode, comparing the test points with the envelope of a standard waveform, if each test point is in the envelope, passing the current sharing characteristic test, enabling the IGBT to be complete in function, outputting the waveform and the result, and completing the current sharing characteristic test of the single IGBT.
Optionally, in the current transformer testing method, the testing of the saturation curve of the reactor includes: the pulse test of the whole converter is utilized, different pulse time is generated under the control of software to realize different pulse currents, and when the current flows through the alternating current reactor, the voltage sensor collects the voltage drop generated at two ends of the alternating current reactor;
and automatically and continuously testing all power kits according to a program sequence operated in the main control board, wherein different reactance currents correspond to different reactor terminal voltages, and a reactor saturation curve is obtained according to a formula U-Ldi/dt.
In the converter test platform and the test method provided by the invention, the operation terminal provides a test instruction to the control unit, the control unit positioned in the converter provides a test signal to the tested main loop, and the tested main loop positioned in the converter comprises the BUS BUS, the voltage sensor, the current sensor, the alternating current reactor and the tested power module to form a test circuit of the tested power module, so that the tested main loop can generate test data according to the performance of the tested power module, and the test platform can be built by connecting the operation terminal with the hardware of the converter.
Furthermore, through the automatic pulse test, namely after the main control board receives the test instruction, all power kits are automatically and continuously tested according to the program sequence operated in the main control board, the problems of long time consumption and low economic benefit of the double pulse test during factory mass production are effectively solved, and the investment of manpower and material resources is reduced; after the current waveform and the voltage waveform acquired by the control unit are passed, a plurality of test points are generated in a discrete mode and are compared with the envelope of a standard waveform, if each test point is in the envelope, the pulse test is passed, the IGBT has good function, the waveform and the result are output, the pulse test of the single IGBT is completed, automatic judgment and test result generation are realized, misjudgment caused by artificial acquisition of the test result is effectively reduced, and the test accuracy is improved.
Furthermore, the stress test program, the current sharing characteristic test program and the reactor saturation curve test program of the external member are added into the corresponding test programs in advance, the stress test, the current sharing characteristic test and the reactor saturation curve test of the external member are synchronously performed in the pulse test process, and the external member is used as an additional function of the pulse test, so that the saturation curve of the reactor of the alternating current loop of the external member can be tested by utilizing a whole platform of the converter, and the boundary capabilities of current sharing, voltage stress and the like of the external member under the extreme working condition can be tested.
Structurally, hardware loops such as a ready-made control platform of the current transformer to be tested, a reactor, a bus, a power kit and the like can be utilized, the test can be carried out on the whole machine only by operating one personal computer, the implementation is simple, and extra hardware cost is not needed. The reason is that all hardware required by the pulse test of the power suite, such as an alternating current/direct current source interface, the power suite, a follow current loop, a current limiting reactor, a wave generating device, a driving plate, an upper computer and the like, are generally provided on the whole converter, so that the test can be performed by directly utilizing the resources of the whole converter without additionally building a tool;
functionally, one is that the pulse test of a large number of power kits can be realized, and the test efficiency is improved; secondly, the test result is automatically judged, so that manual judgment is reduced, and the test accuracy is improved; the principle is that the existing editable software platform of the whole machine is utilized, the testing steps needing manual operation are written in the main control board through software language, the main control board is enabled to carry out corresponding tests according to fixed steps and according to the will of people, and the testing results are judged, so that the automation of a large number of repeated IGBT pulse testing works is realized. And thirdly, additional test items can be carried out, including stress, current sharing characteristic, reactor saturation curve measurement and the like of the external member.
Drawings
FIG. 1 is a schematic diagram of a converter testing platform according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for testing a converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a main circuit to be tested of the converter testing platform according to an embodiment of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings in conjunction with the detailed description.
It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.
In the present invention, "disposed on …", "disposed over …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless otherwise specified. Further, "disposed on or above …" merely indicates the relative positional relationship between two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.
In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.
In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.
It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario. Furthermore, features from different embodiments of the invention may be combined with each other, unless otherwise indicated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.
It is also noted herein that, within the scope of the present invention, the terms "same", "equal", and the like do not mean that the two values are absolutely equal, but allow some reasonable error, that is, the terms also encompass "substantially the same", "substantially equal". By analogy, in the present invention, the terms "perpendicular", "parallel" and the like in the directions of the tables also cover the meanings of "substantially perpendicular", "substantially parallel".
The numbering of the steps of the methods of the present invention does not limit the order of execution of the steps of the methods. Unless specifically stated, the method steps may be performed in a different order.
The following describes the current transformer testing platform and the testing method in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The invention aims to provide a converter testing platform and a testing method, which are used for solving the problems that the existing converter testing lacks mass production testing, batch testing and automatic testing.
In order to achieve the above object, the present invention provides a current transformer testing platform and a testing method, including: an operation terminal configured to provide a test instruction to the control unit; the control unit is configured to provide a test signal to the tested main loop according to the test instruction; the tested main loop is configured to form a test circuit of the tested power module by the BUS BUS, the voltage sensor, the current sensor, the alternating current reactor and the tested power module, and generates test data according to the performance of the tested power module; wherein the control unit and the measured main loop are located inside the converter.
The invention can effectively solve the problems of long time consumption and low economic benefit of the double-pulse test in factory production, and reduce the investment of manpower and material resources; misjudgment caused by man-made test results is effectively reduced, and the test accuracy is improved; the converter test platform of the present invention also has additional functions, including: the saturation curve of the external member alternating current loop reactor can be tested by using the platform of the whole machine; and the boundary capability of the power external member under extreme working conditions such as current sharing and voltage stress can be tested.
As shown in fig. 1, the hardware of the converter testing platform of the present invention is divided into the above three parts, wherein the operation terminal (e.g., human-computer interface, upper computer, etc.) is a computer or a device (e.g., a control unit, a main control board of the converter, etc.) with the same function for connecting the converter. The control unit and the main loop to be tested are positioned in the converter. The control unit comprises a main control board and a driving board. The main control board is a controller generally built by chips with functions of data processing, program control and the like such as a DSP/ARM and the like, and supports various communication interfaces or communication protocols, such as internet access communication with a personal computer and the like; the driving board is connected with the main control board through a flat cable and is responsible for receiving a PWM instruction (namely a PWM signal or a PWM pulse) sent by the main control board, converting the level and distributing a proper gate level signal to the tested power module so as to control the on and off of the power module. The power module to be tested is located in the main circuit to be tested, and as shown in fig. 3, the main circuit to be tested further includes a BUS, a voltage sensor, a current sensor, an ac reactor, and the like.
The flow chart corresponding to the test method is shown in fig. 2: connection/logical relationship between the components and working principle: the control unit and the tested main loop can be independently built, or as shown in fig. 1, the hardware of the converter is directly utilized and belongs to a ready-made hardware loop; the operation terminal can be a personal computer and is connected with the control unit of the converter through a network cable or other communication modes. The personal computer is connected to the converter control panel (namely the main control panel), and after the rest hardware loops of the converter are connected well, a tester can directly perform manual operation on the converter on the personal computer of the tester, perform various tests and acquire test data.
Specifically, the connection mode and the working principle between the control unit and the main loop to be tested are as follows: the control unit is connected with a drive board of a power suite (or simply called a "suite") through a flat cable, during pulse testing, after receiving a test instruction, the control unit sends out a matched PWM signal according to initial parameters such as pulse width, follow current time and the like which are manually set before testing, the signal is sent to the drive board through the flat cable, and in addition, power supply of the drive board is also taken from the control unit through the flat cable; in the converter whole machine, a driving plate is generally directly fixed on the surface of a power external member, wiring holes with fixed sizes and alternating current output copper terminals are arranged on the surface and the periphery of the power external member, matched wiring holes are reserved in the driving plate according to the corresponding sizes and the directions of the positions of the external member terminals during design, and then the driving plate is directly fixed on the power external member through bolts during specific installation; after receiving the PWM signal sent by the control unit, the driving board generates a proper gate-level signal through voltage regulation, isolation, driving resistance and the like in the driving board, and the proper gate-level signal is applied to a ge end of the power external member to control the on and off of the module; under the condition that a bus is electrified, the current waveform can be observed on the alternating current side of the external member, the voltage and the current at each part of the loop are collected into the control unit through various sensors for real-time operation and judgment, and the calculation result and the waveform can be seen by people in real time.
The wiring mode and the working principle of the tested main loop are as follows: as shown in fig. 3, a power loop, triple parallel, ANPC topology of half of the bidirectional converter or what can be considered as a complete tank inverter is shown, and as shown in fig. 3, the number of all IGBT modules in the device reaches hundreds. The BUS BUS and the BUS capacitor are connected to the direct current end of the power external member; the alternating current end (single-phase/three-phase) of the power external member is connected to an alternating current reactor, and the outlet of the reactor needs to be manually short-circuited by a short-circuit clamp to form a complete loop. During the pulse test, the bus is firstly electrified, the control unit can carry out the pulse test after collecting the bus voltage, the personal computer sends a test instruction, the control unit receives the instruction, controls the PWM pulse to receive and transmit, and sends the PWM pulse to the IGBT gate level after conditioning by the drive plate, then the IGBT acts, and voltage and current data generated by the loop are collected and then sent to the control unit. Taking a current waveform as an example, after the waveform acquired by the control unit, a plurality of points are generated in a discrete mode and are compared with the envelope of a standard waveform, if each point is in the envelope, the pulse test is considered to pass, and the function of the IGBT is basically complete. And finally, outputting a waveform and a result, which is the testing principle of the single pulse test.
The automated pulse testing method for multiple power kits comprises the following steps: firstly, preparation work is carried out, and the preparation work comprises the following steps:
1) the method comprises the steps of short-circuiting the output end of the reactor, and connecting a personal computer to carry out configuration of test parameters such as pulse time, pulse number, follow current time and the like;
2) testing on the whole machine, if the AC/DC source can be powered, the bus can be powered in an AC/DC pre-charging mode or a mode of directly connecting a DC high-voltage source;
3) and after the tester checks that the test is correct, the upper computer sends out a test instruction.
Secondly, starting an automatic pulse test (core step):
1) after the main control board receives the test instruction, all power kits (hereinafter referred to as IGBTs) are tested according to the written sequence of the program (running in the main control board of the converter);
2) the main control board gives a PWM instruction, and the IGBT is controlled to be switched on and off after the drive board is conditioned. After the loop acts, voltage waveform and current waveform are generated, and parameters such as bus voltage, external member alternating current, reactor terminal voltage and the like can be acquired by the voltage sensor and the current sensor respectively.
3) And automatically judging the pulse test result by software according to the acquired voltage and current parameters. Taking a current waveform as an example, after the control unit collects the waveform, the control unit samples the waveform in a discrete mode to generate a plurality of test points, and compares the test points with an envelope (for example, a theoretical value given artificially) of a standard waveform, if each test point is within the envelope, the pulse test is considered to pass, and the function of the IGBT is basically complete (namely, the test result is automatically judged).
4) After the current IGBT test is finished, the main control board automatically performs the pulse test of the next IGBT according to the sequence written by the program, and repeats the steps 2) to 4) in the core step until all the IGBTs are tested (namely, the automatic continuous test is realized);
if the fault occurs, stopping the test, prompting a tester to remove the fault, and after the fault removal is finished, selecting to continue the test or retest;
in the testing process, the pulse testing for the IGBT is continuous and uninterrupted, manual judgment and intervention are not needed in the middle, and the testing is stopped unless a fault is detected, so that the method is very suitable for realizing factory automatic testing of the high-power converter. In addition, as an additional function of the test method and the test structure, in the pulse test process, the stress, the current sharing characteristic, the saturation curve of the reactor and the like of the external member can be synchronously tested, and only a corresponding test program needs to be added in advance.
The implementation modes of auxiliary test items such as the stress, the current sharing characteristic, the reactance saturation curve and the like of the external member are as follows:
in the pulse test process, because the current transformer is provided with various ready-made voltage and current sensors and additional sensors can be conveniently applied in the equipment, voltage and current data at each position can be conveniently obtained.
After the bus voltage, the alternating current side current of the external member and the Uce voltage of the external member can be obtained, parameters of the pulse test are manually adjusted, so that the working condition of the pulse test is close to severe. Performing pulse test to obtain Uce when the IGBT shuts off the maximum current at the limit bus voltage, namely realizing the stress test of the external member; under the same limit working condition, after obtaining the current data of each branch circuit of the multiple parallel-connected external member AC/DC outlets, the test data of the current sharing characteristic can be obtained. These data can be collected and analyzed by the control board itself, and the principle is also consistent with the judgment of the pulse test result.
The reactance saturation curve test mode is that the pulse test of the whole machine is utilized, different pulse time is controlled by software to realize different pulse currents, and when the current flows through the reactor, the voltage drop generated at the two ends of the reactor can be collected by the voltage sensor. And (3) obtaining a U-I change curve by corresponding different reactance currents to different reactor terminal voltages, namely obtaining a reactor saturation curve. The process can also be an automatic process, as long as software tests and collects data in sequence according to the manually set point positions, and the principle is consistent with the automation of the pulse test.
In the factory batch test process of high-power electronic equipment such as a converter, one complete machine is provided with hundreds or even more IGBTs, and if the existing method is adopted, a tester needs to manually test and visually judge test results one by one in sequence. If the tester passes through an automatic pulse testing method, the delivery pulse testing time can be controlled within a small working hour, and the method is quick and accurate.
In summary, the above embodiments describe the different configurations of the current transformer testing platform and the testing method in detail, and it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any modifications made on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (12)
1. A converter test platform, comprising:
an operation terminal configured to provide a test instruction to the control unit;
the control unit is configured to provide a test signal to the tested main loop according to the test instruction; and
the tested main loop is configured to form a test circuit of the tested power module by the BUS BUS, the voltage sensor, the current sensor, the alternating current reactor and the tested power module, and generates test data according to the performance of the tested power module;
wherein the control unit and the measured main loop are located inside the converter.
2. The converter test platform of claim 1, wherein the control unit comprises:
the main control board is configured to be built by a chip with data processing and program control functions so as to communicate with the operation terminal; and
and the driving board is configured to be connected with the main control board through a flat cable so as to distribute the adaptive gate-level signals to each tested power module according to the received PWM command and/or switching level sent by the main control board, and further control the on and off of each tested power module.
3. The converter test platform of claim 2, wherein the control unit and the tested main loop are separately constructed, or the converter hardware is directly used as the control unit and the tested main loop;
the operation terminal is a personal computer and is connected with the control unit of the converter through a network cable;
after the operation terminal, the control unit and the tested main loop are determined to be connected, a tester can directly perform manual operation on the converter through a personal computer, perform various tests and acquire test data.
4. The converter test platform of claim 3, wherein the connection mode and operation principle between the control unit and the tested main loop comprises:
the control unit is connected with a drive board of the power suite through a flat cable, during pulse testing, after the main control board receives a test instruction, a matched PWM signal is sent to the drive board through the flat cable according to initial parameters set before testing, the initial parameters comprise pulse width and follow current time,
in the converter whole machine, a driving plate is directly fixed on the surface of a power external member, wiring holes with fixed sizes and alternating-current output copper terminals are formed in the surface and the periphery of the power external member, matched wiring holes are reserved according to the corresponding sizes and the corresponding directions of the positions of the external member terminals when the driving plate is designed, and the driving plate is directly fixedly installed on the power external member through bolts.
5. The converter test platform of claim 4, wherein the power supply to the drive board is taken from the control unit via a flex cable;
after the driving board receives the matched PWM signal, the driving board generates a corresponding gate-level signal through the voltage regulating module, the isolating module and the driving resistor, and applies the gate-level signal to the ge end of the power external member to control the conduction and the disconnection of the power external member;
under the condition that BUS BUS is electrified, voltage sensors collect voltages at all places of a main circuit to be tested as test data, current sensors collect currents at all places of the main circuit to be tested as test data, the current waveforms and the voltage waveforms at the alternating current side of a power kit are observed, the test data are provided to a control unit, the control unit carries out real-time operation and judgment according to the voltages and the currents in the test data, and the current waveforms and the voltage waveforms are provided to a display interface of an operation terminal.
6. The converter test platform of claim 5, wherein the wiring mode and the working principle of the tested main loop are as follows: the BUS BUS and the BUS capacitor are connected to the direct current end of the power external member;
the alternating current end of the power external member is connected to the alternating current reactor, and the outlet of the alternating current reactor is in short circuit by adopting a short circuit clamp so as to form a complete loop.
7. The converter test platform of claim 6, wherein during the pulse test, the BUS BUS is powered on first, the control unit performs the pulse test after collecting the BUS voltage, the personal computer sends out a test command, and the control unit controls the PWM pulse to be sent and received after receiving the test command, and the PWM pulse is conditioned by the drive board and then is provided to the gate level of the IGBT to enable the IGBT to be switched on or off;
after the current waveform and the voltage waveform collected by the control unit, a plurality of test points are generated in a discrete mode and compared with the envelope of the standard waveform, if each test point is in the envelope, the pulse test is passed, the IGBT has a complete function, the waveform and the result are output, and the pulse test of the single IGBT is completed.
8. The method for testing the converter test platform according to claim 7, wherein the automated pulse testing method for the plurality of power packs comprises:
preparing, carrying out short circuit on the output end of the alternating current reactor, connecting the personal computer, the control unit and the tested main loop, and configuring test parameters, wherein the test parameters comprise pulse time, pulse number and follow current time; testing on the converter complete machine, if the AC/DC source can be powered, enabling the bus to be powered in an AC/DC pre-charging mode, or enabling the bus to be powered in a direct-current high-voltage source direct connection mode;
after the tester checks that the test is correct, the upper computer sends out a test instruction to start the automatic pulse test: after receiving the test instruction, the main control board automatically and continuously tests all the power suites according to the sequence of the programs running in the main control board;
current IGBT testing includes: the main control board provides PWM pulses, the IGBT is controlled to be switched on and off after the PWM pulses are conditioned by the driving board, voltage waveforms and current waveforms are generated after a tested loop acts, a voltage sensor acquires bus voltage and alternating current reactor end voltage, and a current sensor acquires alternating current end current of a power suite.
9. The current transformer testing method of claim 8,
after the current IGBT test is finished, the main control board automatically carries out the pulse test of the next IGBT according to the sequence written by the program, and repeats the current IGBT test step until all the IGBTs are tested;
if the fault occurs, stopping the test, prompting a tester to remove the fault, and after the fault removal is finished, selecting to continue the test or retest;
and adding the stress test program of the suite, the current sharing characteristic test program and the saturation curve test program of the reactor into the corresponding test programs in advance, and synchronously carrying out the stress test of the suite, the current sharing characteristic test and the saturation curve test of the reactor in the pulse test process to serve as an additional function of the pulse test.
10. The current transformer testing method of claim 9, wherein the kit stress test comprises: after obtaining the bus voltage, the alternating-current side current of the power kit and the Uce voltage of the power kit, adjusting parameters of pulse testing to enable working conditions of the pulse testing to be limiting conditions, carrying out the pulse testing to obtain the Uce of the power kit when the power kit is cut off at the maximum current under the limiting bus voltage, and finishing the stress testing of the kit of the power kit.
11. The converter testing method of claim 9, wherein the current sharing characteristic testing comprises: under the same limit working condition, obtaining current data of each branch of a plurality of parallel power external member alternating current end outlets and a plurality of parallel power external member direct current end outlets, obtaining test data of current sharing characteristics, collecting and analyzing results by a main control board, generating a plurality of test points by the acquired current waveform and voltage waveform in a discrete mode, comparing the test points with the envelope of a standard waveform, if each test point is in the envelope, passing the current sharing characteristic test, enabling the IGBT to be complete in function, outputting the waveform and the result, and completing the current sharing characteristic test of the single IGBT.
12. The current transformer test method of claim 9, wherein the testing of the reactor saturation curve comprises: the pulse test of the whole converter is utilized, different pulse time is generated under the control of software to realize different pulse currents, and when the current flows through the alternating current reactor, the voltage sensor collects the voltage drop generated at two ends of the alternating current reactor;
and automatically and continuously testing all power kits according to a program sequence operated in the main control board, wherein different reactance currents correspond to different reactor terminal voltages, and a reactor saturation curve is obtained according to a formula U-Ldi/dt.
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