CN112557792A - Power electronic transformer power module online testing device and method thereof - Google Patents
Power electronic transformer power module online testing device and method thereof Download PDFInfo
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- CN112557792A CN112557792A CN202011406791.XA CN202011406791A CN112557792A CN 112557792 A CN112557792 A CN 112557792A CN 202011406791 A CN202011406791 A CN 202011406791A CN 112557792 A CN112557792 A CN 112557792A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention provides an online testing device for a power electronic transformer power module, which comprises an upper computer system, a first power module, a second power module and a direct current voltage source, wherein the low-voltage side of the first power module and the low-voltage side of the second power module are connected in parallel at two ends of the direct current voltage source, an inductor L is connected in series between the positive electrode of the high-voltage side of the first power module and the positive electrode of the high-voltage side of the second power module, the negative electrode of the high-voltage side of the first power module is connected with the negative electrode of the high-voltage side of the second power module through a lead, and the first power module and the second power module are both in communication connection with the upper computer system. The invention also provides an online test method for the power module of the power electronic transformer. The invention has small test power supply loss and simple test operation, and solves the problem that the conventional test platform and test method are insufficient in testing the power module.
Description
Technical Field
The invention relates to the technical field of power electronic transformer power modules, in particular to an online testing device and method for a power electronic transformer power module.
Background
With the development of power electronic technology and semiconductor technology, a large number of alternating current and direct current hybrid power distribution systems, such as alternating current and direct current hybrid micro-grids, electric vehicle charging stations, data center power supply systems and the like, appear in power systems, wherein the main equipment responsible for power conversion is a Power Electronic Transformer (PET). The PET is formed by a large number of power modules in a series-parallel connection cascade mode, and the reliability of the power modules is the key of safe and stable operation of the PET, so that strict, comprehensive and accurate test on the power modules is the premise of safe operation of the PET.
The existing PET power module test can be divided into a primary loop test and a secondary loop test according to test properties; the method can be divided into a basic function test, a stability test and the like according to the test purpose. The primary loop test and the secondary loop test are basic function tests and mainly comprise an insulation withstand voltage test, a main loop on-off test, a driving test and a communication test, and are necessary test items for the live operation of the power module. The stability test mainly refers to that the power module runs for a long time according to rated voltage and rated current so as to verify the thermal stability, the electrical characteristics and the like of the power device. Only if the stability test of the power module passes, the power module can be installed on the whole machine to be put into practical operation. However, in the current power module testing method, a testing platform based on 'power supply → power module → resistive load' is generally built for a single power module, and when testing is performed, active power passing through the power module can only flow in a single direction, and the actual operating condition of the power module cannot be accurately simulated; in addition, even if a test platform of 'power supply → power module → power supply' is built, the test platform is complicated, and two direct current voltage sources are required to be synchronously operated. Only by building a perfect power module test platform and fully testing the power module, the performance of the power module can be comprehensively and accurately verified, and the reliable operation of the power electronic transformer is ensured. Chinese patent publication No. CN106019174A, publication time 2016, 10, 12 months, and the technical solution disclosed in the patent cannot perform a comprehensive test on a power module.
Disclosure of Invention
The invention aims to overcome the defects that the existing test circuit is complex, a plurality of direct current voltage sources are required to be synchronously operated, the test loss is large, and the stability test is not complete, and provides an on-line test device for a power module of a power electronic transformer. The invention has small test power supply loss and simple test operation, and solves the problem that the conventional test platform and test method are insufficient and incomplete to test the power module.
The invention also provides an online test method for the power module of the power electronic transformer.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a power electronic transformer power module on-line measuring device, wherein, includes host computer system, first power module, second power module and direct current voltage source, the low pressure side of first power module and the low pressure side of second power module are parallelly connected at the direct current voltage source both ends, the positive pole of first power module high-pressure side with an inductance L establishes ties between the positive pole of second power module high-pressure side, the negative pole of first power module high-pressure side with connect through the wire between the negative pole of second power module high-pressure side, first power module and second power module all with host computer system communication is connected.
In the technical scheme, the first power module and the second power module form a loop, only one direct current voltage source is needed to serve as a power source in the testing device, the upper computer system can send a signal instruction to the first power module and the second power module, the first power module and the second power module can operate according to the signal instruction of the upper computer system, the first power module and the second power module upload data of the operating state of the first power module and the second power module to the upper computer system, a tester can directly obtain test data in the upper computer system, and the operating state and the test result of the first power module and the second power module are judged.
Furthermore, control panels are arranged inside the first power module and the second power module, and the upper computer system is in communication connection with the control panels of the first power module and the second power module. In the technical scheme, an instruction sent by the upper computer system is input into the control panels of the first power module and the second power module, and the control panels of the first power module and the second power module control the operation of internal devices according to the instruction sent by the upper computer system.
Furthermore, the upper computer system is connected with the first power module and the second power module through optical fibers. The upper computer system is in communication connection with the first power module and the second power module through optical fibers, and bidirectional communication is carried out by utilizing the optical fibers.
Further, the upper system receives the uploading information of the first power module and the second power module, and sends a signal instruction to the first power module and the second power module.
Further, the uploaded information includes voltages and powers of low-voltage sides and high-voltage sides of the first power module and the second power module, temperatures and currents of components inside the first power module and the second power module, and operating states of the first power module and the second power module.
Further, the signal instructions include operation modes of the first power module and the second power module, start-stop commands, voltage and current instructions of operation, driving signals and protection signals.
An online test method for a power module of a power electronic transformer comprises the following steps:
s1, assembling and connecting the online testing device, and adjusting a threshold value of a signal instruction sent by an upper computer system according to inherent parameters of a first power module and a second power module; the intrinsic parameters refer to rated current, voltage and power of the power module;
s2, respectively setting the first power module and the second power module as a tested module and an accompanying module according to test requirements;
s3, the upper computer system sends corresponding signal instructions to the tested module and the accompanying module according to different testing tasks and records uploading information of the corresponding signal instructions;
and S4, after the testing time is up, the upper computer system sends a signal instruction, and the direct-current voltage source is closed to finish the test.
Further, the step S3 specifically includes the following steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, setting the operation mode of the tested module to be constant-power operation, setting the test accompanying module to be constant-voltage operation, uploading operation information and data of the tested module and the test accompanying module to an upper computer system, and checking the operation states of the tested module and the test accompanying module through the upper computer system;
s33, the upper computer system issues a starting command to the accompanying module, and the accompanying module observes the high-voltage side voltage real-time data through the upper computer system after being started to operate;
and S34, the upper computer system issues a starting command to the tested module, and the state information of the tested power module is observed through the upper computer system after the tested module is started and operated.
Preferably, the step S3 specifically includes the following steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, the upper computer system issues a power instruction to the tested module, the power instruction is gradually increased from zero to positive rated power, and whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can change along with the set instruction is observed through the upper computer system; changing the power instruction of the tested module into negative rated power in the upper computer system, and observing whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can be changed into rated values along with the set instruction;
and S33, the upper computer system keeps the power instruction of the tested module as a rated value, continuously operates according to the time required by the test, and simultaneously records the voltage, the current and the temperature value of the tested module.
Further, after the running time of the test requirement is reached in step S4, the upper computer system sets the power instruction of the module to be tested to 0, issues a shutdown command of the module to be tested, then issues a shutdown command of the accompanying module, and finally turns off the dc voltage source to complete the test.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the high-voltage side and the low-voltage side of the two power modules are connected in parallel, a paired towing operation framework is designed, and the low-voltage side is connected in parallel with a direct-current voltage source, so that the test power supply loss is small, the test operation is simple, and the function test is sufficient; the invention is also provided with an upper computer system which can provide an online test platform for the power module of the power electronic transformer and also can provide a test platform for the function verification of the power electronic transformer, thereby solving the problem that the power module is not fully tested by the conventional test platform and test method.
Drawings
Fig. 1 is a schematic diagram of an overall structure of an online testing device for a power module of a power electronic transformer according to the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
Fig. 1 shows an embodiment of an on-line testing apparatus for a power module of a power electronic transformer according to the present invention. The utility model provides a power electronic transformer power module on-line measuring device, wherein includes host computer system, first power module, second power module and direct current voltage source, the low pressure side of first power module and the low pressure side of second power module are parallelly connected at the direct current voltage source both ends, an inductance L establishes ties between the positive pole of first power module high pressure side and the positive pole of second power module high pressure side, connect through the wire between the negative pole of first power module high pressure side and the negative pole of second power module high pressure side, first power module and second power module all are connected with host computer system communication.
In this embodiment, control boards are respectively disposed in the first power module and the second power module, the upper computer system realizes bidirectional communication with the control boards in the first power module and the second power module through an optical fiber line, and the upper computer system receives information uploaded by the control boards of the first power module and the second power module and issues a signal instruction to the control boards of the first power module and the second power module.
In this embodiment, the uploaded information includes voltages and powers of low-voltage sides and high-voltage sides of the first power module and the second power module, temperatures and currents of internal components of the first power module and the second power module, and operating states of the first power module and the second power module; the signal instructions comprise operation modes of the first power module and the second power module, start-stop commands, operation voltage and current instructions, driving signals and protection signals
The working principle of the embodiment is as follows: the first power module and the second power module form a loop, only one direct current voltage source is needed to serve as a power source in the device to form a split-dragging operation framework, the upper computer system can send signal instructions to the first power module and the second power module to enable the first power module and the second power module to operate according to the signal instructions of the upper computer system, the first power module and the second power module upload data of the operation states of the first power module and the second power module to the upper computer system, a tester can directly obtain test data in the upper computer system and judge the operation states and test results of the first power module and the second power module.
Example 2
The invention discloses an embodiment of an online testing method for a power module of a power electronic transformer. An online test method for a power module of a power electronic transformer specifically comprises the following specific steps:
s1, assembling and connecting the online testing device, and adjusting a threshold value of a signal instruction sent by an upper computer system according to inherent parameters of a first power module and a second power module;
s2, respectively setting the first power module and the second power module as a tested module and an accompanying module according to test requirements;
s3, the upper computer system sends corresponding signal instructions to the tested module and the accompanying module according to different testing tasks and records uploading information of the corresponding signal instructions;
and S4, after the testing time is up, the upper computer system sends a signal instruction, and the direct-current voltage source is closed to finish the test.
In step S3, the method specifically includes the following steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, setting the operation mode of the tested module to be constant-power operation, setting the test accompanying module to be constant-voltage operation, uploading operation information and data of the tested module and the test accompanying module to an upper computer system, and checking the operation states of the tested module and the test accompanying module through the upper computer system;
s33, the upper computer system issues a starting command to the accompanying module, and the accompanying module observes the high-voltage side voltage real-time data through the upper computer system after being started to operate;
and S34, the upper computer system issues a starting command to the tested module, and the state information of the tested power module is observed through the upper computer system after the tested module is started and operated.
In this embodiment, after the running time required by the test is reached in step S4, the upper computer system sets the power instruction of the module to be tested to 0, issues the shutdown command of the module to be tested, then issues the shutdown command of the test-accompanying module, and finally turns off the dc voltage source to complete the test.
Example 3
This example is similar to example 2, except that: the step 3 comprises the following specific steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, the upper computer system issues a power instruction to the tested module, the power instruction is gradually increased from zero to positive rated power, and whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can change along with the set instruction is observed through the upper computer system; changing the power instruction of the tested module into negative rated power in the upper computer system, and observing whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can be changed into rated values along with the set instruction;
and S33, the upper computer system keeps the power instruction of the tested module as a rated value, continuously operates according to the time required by the test, and simultaneously records the voltage, the current and the temperature value of the tested module.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a power electronic transformer power module on-line measuring device which characterized in that: including host computer system, first power module, second power module and direct current voltage source, the low pressure side of first power module and the low pressure side of second power module are parallelly connected at the direct current voltage source both ends, the positive pole of first power module high-pressure side with an inductance L establishes ties between the positive pole of second power module high-pressure side, the negative pole of first power module high-pressure side with connect through the wire between the negative pole of second power module high-pressure side, first power module and second power module all with host computer system communication is connected.
2. The on-line testing device for the power module of the power electronic transformer as claimed in claim 1, wherein: control panels are arranged in the first power module and the second power module, and the upper computer system is in communication connection with the control panels of the first power module and the second power module.
3. The on-line testing device for the power module of the power electronic transformer as claimed in claim 1, wherein: and the upper computer system is connected with the first power module and the second power module through optical fibers.
4. The on-line testing device for the power module of the power electronic transformer as claimed in claim 1, wherein: the upper system receives the uploading information of the first power module and the second power module and sends a signal instruction to the first power module and the second power module.
5. The on-line testing device for the power module of the power electronic transformer as claimed in claim 4, wherein: the uploaded information comprises the voltage and the power of the low-voltage side and the high-voltage side of the first power module and the second power module, the temperature and the current of components inside the first power module and the second power module, and the running states of the first power module and the second power module.
6. The on-line testing device for the power module of the power electronic transformer as claimed in claim 4, wherein: the signal instructions include operating modes of the first power module and the second power module, start-stop commands, operating voltage and current instructions, drive signals, and protection signals.
7. An online test method for a power module of a power electronic transformer is characterized by comprising the following steps: the method comprises the following steps:
s1, assembling and connecting the online testing device, and adjusting a threshold value of a signal instruction sent by an upper computer system according to inherent parameters of a first power module and a second power module;
s2, respectively setting the first power module and the second power module as a tested module and an accompanying module according to test requirements;
s3, the upper computer system sends corresponding signal instructions to the tested module and the accompanying module according to different testing tasks and records uploading information of the corresponding signal instructions;
and S4, after the testing time is up, the upper computer system sends a signal instruction, and the direct-current voltage source is closed to finish the test.
8. The on-line testing method of the power electronic transformer power module of claim 7: the method is characterized in that: in step S3, the method specifically includes the following steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, setting the operation mode of the tested module to be constant-power operation, setting the test accompanying module to be constant-voltage operation, uploading operation information and data of the tested module and the test accompanying module to an upper computer system, and checking the operation states of the tested module and the test accompanying module through the upper computer system;
s33, the upper computer system issues a starting command to the accompanying module, and the accompanying module observes the high-voltage side voltage real-time data through the upper computer system after being started to operate;
and S34, the upper computer system issues a starting command to the tested module, and the state information of the tested power module is observed through the upper computer system after the tested module is started and operated.
9. The on-line testing method of the power electronic transformer power module of claim 7: the method is characterized in that: in step S3, the method specifically includes the following steps:
s31, turning on a direct-current voltage source, and gradually adjusting the direct-current voltage source to the normal working voltage of the low-voltage sides of the first power module and the second power module;
s32, the upper computer system issues a power instruction to the tested module, the power instruction is gradually increased from zero to positive rated power, and whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can change along with the set instruction is observed through the upper computer system; changing the power instruction of the tested module into negative rated power in the upper computer system, and observing whether the voltage and the current of the high-voltage side and the low-voltage side of the tested module can be changed into rated values along with the set instruction;
and S33, the upper computer system keeps the power instruction of the tested module as a rated value, continuously operates according to the time required by the test, and simultaneously records the voltage, the current and the temperature value of the tested module.
10. The on-line testing method of the power electronic transformer power module of claim 7: the method is characterized in that: and after the running time of the test requirement is reached in the step S4, setting the power instruction of the tested module to be 0 by the upper computer system, issuing a shutdown command of the tested module, then issuing a shutdown command of the accompanied test module, and finally closing the direct-current voltage source to finish the test.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640709A (en) * | 2021-06-18 | 2021-11-12 | 国网电力科学研究院有限公司 | H-bridge cascade PET testing method based on black box testing |
| CN113805002A (en) * | 2021-09-17 | 2021-12-17 | 广东电网有限责任公司 | Detection device, method and equipment for power electronic direct current transformer and storage medium |
| CN113917227A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Energy circulation detection system and method for power module of direct-current transformer |
| CN113917264A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | System and method for detecting power module of flexible loop closing device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08191536A (en) * | 1995-01-09 | 1996-07-23 | Toshiba Corp | Direction short circuit protective equipment |
| CN102901893A (en) * | 2012-09-26 | 2013-01-30 | 西安奥特迅电力电子技术有限公司 | Control method for drag test of power units of high voltage static reactive power compensation device |
| CN204679566U (en) * | 2015-06-11 | 2015-09-30 | 中国西电电气股份有限公司 | A kind of high pressure flexible direct current transmitted power unit forceful electric power test loop |
| CN104991131A (en) * | 2015-06-12 | 2015-10-21 | 中国科学院电工研究所 | Flexible direct-current power-transmission converter-valve half-bridge structure power module test device |
| CN107643455A (en) * | 2016-07-21 | 2018-01-30 | 西安奥特迅电力电子技术有限公司 | The control platform that a kind of mechanical back to back test for railway power regulator power cell is tested |
-
2020
- 2020-12-04 CN CN202011406791.XA patent/CN112557792A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08191536A (en) * | 1995-01-09 | 1996-07-23 | Toshiba Corp | Direction short circuit protective equipment |
| CN102901893A (en) * | 2012-09-26 | 2013-01-30 | 西安奥特迅电力电子技术有限公司 | Control method for drag test of power units of high voltage static reactive power compensation device |
| CN204679566U (en) * | 2015-06-11 | 2015-09-30 | 中国西电电气股份有限公司 | A kind of high pressure flexible direct current transmitted power unit forceful electric power test loop |
| CN104991131A (en) * | 2015-06-12 | 2015-10-21 | 中国科学院电工研究所 | Flexible direct-current power-transmission converter-valve half-bridge structure power module test device |
| CN107643455A (en) * | 2016-07-21 | 2018-01-30 | 西安奥特迅电力电子技术有限公司 | The control platform that a kind of mechanical back to back test for railway power regulator power cell is tested |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640709A (en) * | 2021-06-18 | 2021-11-12 | 国网电力科学研究院有限公司 | H-bridge cascade PET testing method based on black box testing |
| CN113640709B (en) * | 2021-06-18 | 2023-08-25 | 国网电力科学研究院有限公司 | H-bridge cascade PET test method based on black box test |
| CN113805002A (en) * | 2021-09-17 | 2021-12-17 | 广东电网有限责任公司 | Detection device, method and equipment for power electronic direct current transformer and storage medium |
| CN113917227A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Energy circulation detection system and method for power module of direct-current transformer |
| CN113917264A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | System and method for detecting power module of flexible loop closing device |
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