CN114076857A - Current transformer test platform and test method - Google Patents
Current transformer test platform and test method Download PDFInfo
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- CN114076857A CN114076857A CN202010827450.3A CN202010827450A CN114076857A CN 114076857 A CN114076857 A CN 114076857A CN 202010827450 A CN202010827450 A CN 202010827450A CN 114076857 A CN114076857 A CN 114076857A
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- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 238000010998 test method Methods 0.000 title abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005034 decoration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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Abstract
The invention discloses a current transformer test platform and a test method. Wherein, this converter test platform includes: the device comprises a motor, a permanent magnet direct drive motor and a rectifier, wherein the output end of a frequency converter is connected with the input end of the motor and used for adjusting the rotating speed of the input motor and driving the motor; the output end of the motor is connected with the input end of the permanent magnet direct drive motor and is used for driving the permanent magnet direct drive motor; the output end of the permanent magnet direct drive motor is connected with the input end of the rectifier and used for outputting alternating voltage in a preset range according to the adjusted rotating speed; and the rectifier is used for controlling the alternating-current voltage and outputting the direct-current voltage within a preset range. The invention solves the technical problem of high construction cost of the test platform caused by the high price of the large-capacity battery simulator configured in the process of constructing the test platform in the prior art.
Description
Technical Field
The invention relates to the field of electrical technology application, in particular to a current transformer test platform and a test method.
Background
Because the output power of the centralized photovoltaic inverter or the energy storage converter is large and the range of the input direct-current voltage is wide, a large-capacity battery simulator (DC-Source) is generally required to be configured in order to perform comprehensive tests in a laboratory, but the construction cost of a test platform is very high due to the very high price of the battery simulator.
Aiming at the problem that the cost of building the test platform is high due to the fact that a large-capacity battery simulator is configured in the process of building the test platform in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a current transformer test platform and a test method, which at least solve the technical problem that the cost for building the test platform is high because a large-capacity battery simulator is configured in the process of building the test platform in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a current transformer test platform, including: the permanent magnet direct drive motor comprises a frequency converter, a motor, a permanent magnet direct drive motor and a rectifier, wherein the output end of the frequency converter is connected with the input end of the motor and used for adjusting the rotating speed of the input motor and driving the motor; the output end of the motor is connected with the input end of the permanent magnet direct drive motor and is used for driving the permanent magnet direct drive motor; the output end of the permanent magnet direct drive motor is connected with the input end of the rectifier and used for outputting alternating voltage in a preset range according to the adjusted rotating speed; and the rectifier is used for controlling the alternating-current voltage and outputting the direct-current voltage within a preset range.
Optionally, the rectifier comprises: and the input end of the pulse rectifier is connected with the output end of the permanent magnet direct drive motor and is used for acquiring alternating current voltage and outputting direct current voltage within a preset range through closed-loop control.
Optionally, the rectifier comprises: and the input end of the diode is connected with the output end of the permanent magnet direct drive motor and is used for acquiring alternating voltage, controlling the alternating voltage and outputting direct voltage within a preset range.
Further, optionally, the preset range of the dc voltage includes: [500V, 1000V ].
Optionally, the converter test platform further includes: the photovoltaic inverter or the energy storage converter is connected with the rectifier through a capacitor and used for acquiring direct current voltage in a preset range, converting the direct current voltage in the preset range and outputting alternating current voltage.
Further, optionally, the converter testing platform further includes: the transformer comprises an isolation transformer, wherein the input end of the isolation transformer is connected with the output end of the photovoltaic inverter or the energy storage converter and is used for transforming the alternating-current voltage output by the photovoltaic inverter or the energy storage converter.
Optionally, the converter test platform is applied to a wind energy direct-drive test platform.
According to another aspect of the embodiments of the present invention, there is also provided a testing method applied to the converter testing platform, including: adjusting the rotating speed of an input motor, and driving a permanent magnet direct drive motor through the motor with the adjusted rotating speed; outputting alternating current voltage in a preset range through a permanent magnet direct drive motor; the rectifier is used for controlling the alternating voltage and outputting the direct voltage within a preset range.
Optionally, the controlling the ac voltage by the rectifier, and outputting the dc voltage within the preset range includes: under the condition that the rectifier comprises a pulse rectifier, alternating current voltage is obtained through the pulse rectifier, and direct current voltage in a preset range is output through closed-loop control.
Optionally, the controlling the ac voltage by the rectifier, and outputting the dc voltage within the preset range includes: under the condition that the rectifier comprises a diode, alternating current voltage is obtained through the diode, the alternating current voltage is controlled, and direct current voltage in a preset range is output.
In the embodiment of the invention, the method of dynamic characteristics of the stator induced voltage of the permanent magnet direct drive motor is adopted, the rotating speed of the input motor is adjusted, and the permanent magnet direct drive motor is driven by the motor with the adjusted rotating speed; outputting alternating current voltage in a preset range through a permanent magnet direct drive motor; alternating voltage is controlled through the rectifier, direct voltage within a preset range is output, the aim of meeting the requirement of a photovoltaic inverter or an energy storage converter test platform for direct-current side voltage is achieved, the technical effect of reducing the building cost of the test platform is achieved, and the technical problem that the building cost of the test platform is high due to the fact that a large-capacity battery simulator is configured in the process of building the test platform in the prior art is high in price is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a current transformer test platform according to an embodiment of the invention;
FIG. 2a is a schematic diagram of a current transformer test platform according to an embodiment of the invention;
FIG. 2b is a schematic diagram of another current transformer test platform according to an embodiment of the invention;
FIG. 3 is a flow chart of a testing method according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, an embodiment of a current transformer test platform is provided, and fig. 1 is a schematic diagram of a current transformer test platform according to an embodiment of the present invention, as shown in fig. 1, the current transformer test platform provided in the embodiment of the present application includes:
the device comprises a frequency converter 12, a motor 14, a permanent magnet direct drive motor 16 and a rectifier 18, wherein the output end of the frequency converter 12 is connected with the input end of the motor 14 and is used for adjusting the rotating speed of the input motor 14 and driving the motor 14; the output end of the motor 14 is connected with the input end of the permanent magnet direct drive motor 16 and is used for driving the permanent magnet direct drive motor 16; the output end of the permanent magnet direct drive motor 16 is connected with the input end of the rectifier 18 and used for outputting alternating voltage in a preset range according to the adjusted rotating speed; and the rectifier 18 is used for controlling the alternating-current voltage and outputting the direct-current voltage within a preset range.
As shown in fig. 1, the permanent Magnet direct drive motor 16 in the embodiment of the present application may be labeled as pmsm (permanent Magnet Synchronous motor).
In the embodiment of the application, the motor 14 is coaxially connected with the permanent magnet direct drive motor 16, and the purpose of adjusting the output voltage of the permanent magnet synchronous generator is achieved by adjusting the rotating speed of the motor 14.
Optionally, the current transformer test platform provided in the embodiment of the present application further includes: the photovoltaic inverter or the energy storage converter is connected with the rectifier through a capacitor and used for acquiring direct current voltage in a preset range, converting the direct current voltage in the preset range and outputting alternating current voltage.
The dc voltage output by the finisher 16 is converted by a photovoltaic inverter or an energy storage converter to obtain an ac voltage, so as to provide an input voltage for a subsequent load.
Further, optionally, the current transformer test platform provided in the embodiment of the present application further includes: the transformer comprises an isolation transformer, wherein the input end of the isolation transformer is connected with the output end of the photovoltaic inverter or the energy storage converter and is used for transforming the alternating-current voltage output by the photovoltaic inverter or the energy storage converter.
The alternating-current voltage output by the photovoltaic inverter or the energy storage converter is boosted or reduced through the isolation transformer based on the conversion of the photovoltaic inverter or the energy storage converter to the direct-current voltage, so that the alternating-current power demand of the follow-up load can be met through the alternating-current power after voltage transformation.
The converter test platform provided by the embodiment of the application utilizes the dynamic characteristic of the induction voltage of the stator of the existing permanent magnet direct drive motor. Namely, as long as the rotating speed of the motor is reasonably adjusted, corresponding alternating-current voltage can be induced on the stator side of the permanent magnet motor, and then the direct-current voltage range can be obtained by controlling through the rectifier.
To sum up, the converter test platform provided by the embodiment of the present application includes two implementation manners in the implementation process, which are specifically as follows:
the first method is as follows: fig. 2a is a schematic diagram of a current transformer test platform according to an embodiment of the present invention, and as shown in fig. 2a, the current transformer test platform provided in the embodiment of the present invention is specifically as follows:
optionally, the rectifier 18 includes: and the input end of the pulse rectifier is connected with the output end of the permanent magnet direct drive motor and is used for acquiring alternating current voltage and outputting direct current voltage within a preset range through closed-loop control.
In fig. 2a, the pulse rectifier is referred to as a pwm (pulse Width modulation) rectifier.
Specifically, as shown in fig. 2a, the converter testing platform provided in the embodiment of the present application uses a frequency converter 12 to drive a motor to regulate speed, so as to obtain an ac induced voltage in a preset range at a stator side of a permanent magnet motor 14, and then performs closed-loop control through a PWM rectifier, so as to output a dc voltage in the preset range.
The second method comprises the following steps: fig. 2b is a schematic diagram of another converter testing platform according to an embodiment of the present invention, and as shown in fig. 2a, the converter testing platform provided in the embodiment of the present invention is specifically as follows:
optionally, the rectifier 18 includes: and the input end of the diode is connected with the output end of the permanent magnet direct drive motor and is used for acquiring alternating voltage, controlling the alternating voltage and outputting direct voltage within a preset range.
Specifically, as shown in fig. 2b, the converter testing platform provided in the embodiment of the present application drives the motor to regulate speed through the frequency converter 12, so as to obtain an ac induced voltage in a preset range at the stator side of the permanent magnet motor 14, and then the ac induced voltage is converted through the diode uncontrolled rectifier, so as to output a dc voltage in the preset range.
Further, optionally, the preset range of the dc voltage includes: [500V, 1000V ].
Optionally, the converter test platform provided by the embodiment of the application is applied to a wind energy direct-drive test platform.
Example 2
In accordance with an embodiment of the present invention, there is provided a method embodiment of a test method, it being noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 3 is a schematic flowchart of a testing method according to an embodiment of the present invention, and as shown in fig. 3, an embodiment of the present invention provides a testing method applied to the converter testing platform in embodiment 1, where the method includes the following steps:
step S302, adjusting the rotating speed of an input motor, and driving a permanent magnet direct drive motor through the motor with the adjusted rotating speed;
in step S302, the testing method provided in the embodiment of the present application is applied to the converter testing platform in embodiment 1, so that when testing, firstly, the rotation speed of the motor is adjusted by the frequency converter, and the adjusted rotation speed is input into the permanent magnet direct drive motor, and then step S304 is executed.
Step S304, outputting alternating current voltage in a preset range through the permanent magnet direct drive motor;
in step S304, based on the adjusted rotation speed obtained in step S302, an ac voltage in a preset range is obtained at the stator side of the permanent magnet direct drive motor by inputting the permanent magnet direct drive motor.
And S306, controlling the alternating-current voltage through the rectifier and outputting the direct-current voltage within a preset range.
In step S306, based on the ac voltage in the preset range obtained in step S304, since the key point of the embodiment of the present application is to obtain the dc input voltage in the preset range, the ac voltage is controlled by the rectifier, and the dc voltage in the preset range is finally output.
In the embodiment of the invention, the method of dynamic characteristics of the stator induced voltage of the permanent magnet direct drive motor is adopted, the rotating speed of the input motor is adjusted, and the permanent magnet direct drive motor is driven by the motor with the adjusted rotating speed; outputting alternating current voltage in a preset range through a permanent magnet direct drive motor; alternating voltage is controlled through the rectifier, direct voltage within a preset range is output, the aim of meeting the requirement of a photovoltaic inverter or an energy storage converter test platform for direct-current side voltage is achieved, the technical effect of reducing the building cost of the test platform is achieved, and the technical problem that the building cost of the test platform is high due to the fact that a large-capacity battery simulator is configured in the process of building the test platform in the prior art is high in price is solved.
Optionally, in step S306, the controlling the ac voltage by the rectifier, and outputting the dc voltage in the preset range includes: under the condition that the rectifier comprises a pulse rectifier, alternating current voltage is obtained through the pulse rectifier, and direct current voltage in a preset range is output through closed-loop control.
Based on the first mode in embodiment 1, when the rectifier includes a PWM rectifier, the PWM finisher acquires an ac voltage in a preset range from the stator side of the permanent magnet direct drive motor, and then outputs a dc voltage in the preset range through closed-loop control.
Optionally, in step S306, the controlling the ac voltage by the rectifier, and outputting the dc voltage in the preset range includes: under the condition that the rectifier comprises a diode, alternating current voltage is obtained through the diode, the alternating current voltage is controlled, and direct current voltage in a preset range is output.
Based on the second mode in embodiment 1, under the condition that the rectifier includes the diode, the diode obtains the ac voltage in the preset range at the stator side of the permanent-magnet direct-drive motor, and then the ac voltage is converted to output the dc voltage in the preset range.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A converter test platform, comprising:
a frequency converter, a motor, a permanent magnet direct drive motor and a rectifier, wherein,
the output end of the frequency converter is connected with the input end of the motor and is used for adjusting the rotating speed input into the motor and driving the motor;
the output end of the motor is connected with the input end of the permanent magnet direct drive motor and is used for driving the permanent magnet direct drive motor;
the output end of the permanent magnet direct drive motor is connected with the input end of the rectifier and used for outputting alternating voltage in a preset range according to the adjusted rotating speed;
and the rectifier is used for controlling the alternating voltage and outputting the direct voltage within a preset range.
2. The converter testing platform of claim 1, wherein said rectifier comprises: and the input end of the pulse rectifier is connected with the output end of the permanent magnet direct drive motor and is used for acquiring the alternating voltage and outputting the direct voltage within the preset range through closed-loop control.
3. The converter testing platform of claim 1, wherein said rectifier comprises: and the input end of the diode is connected with the output end of the permanent magnet direct drive motor and is used for acquiring the alternating voltage, controlling the alternating voltage and outputting the direct voltage within the preset range.
4. The converter test platform according to claim 2 or 3, wherein the predetermined range of DC voltages comprises: [500V, 1000V ].
5. The converter test platform of claim 1, further comprising: the photovoltaic inverter or the energy storage converter is connected with the rectifier through a capacitor and is used for acquiring the direct current voltage in the preset range, converting the direct current voltage in the preset range and outputting alternating current voltage.
6. The converter test platform of claim 5, further comprising: the transformer comprises an isolation transformer, wherein the input end of the isolation transformer is connected with the output end of the photovoltaic inverter or the energy storage converter and is used for transforming the alternating voltage output by the photovoltaic inverter or the energy storage converter.
7. The converter test platform according to claim 1, wherein the converter test platform is applied to a wind energy direct drive test platform.
8. A testing method is applied to the current transformer testing platform of claim 1, and comprises the following steps:
adjusting the rotating speed of an input motor, and driving a permanent magnet direct drive motor through the motor with the adjusted rotating speed;
outputting alternating current voltage within a preset range through the permanent magnet direct drive motor;
and controlling the alternating voltage through a rectifier, and outputting the direct voltage within a preset range.
9. The method of claim 8, wherein the controlling the ac voltage by the rectifier to output a predetermined range of dc voltage comprises:
and under the condition that the rectifier comprises a pulse rectifier, acquiring the alternating-current voltage through the pulse rectifier, and outputting the direct-current voltage in the preset range through closed-loop control.
10. The method of claim 8, wherein the controlling the ac voltage by the rectifier to output a predetermined range of dc voltage comprises:
and under the condition that the rectifier comprises a diode, the alternating voltage is obtained through the diode, the alternating voltage is controlled, and the direct voltage in the preset range is output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010827450.3A CN114076857A (en) | 2020-08-17 | 2020-08-17 | Current transformer test platform and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010827450.3A CN114076857A (en) | 2020-08-17 | 2020-08-17 | Current transformer test platform and test method |
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| CN114076857A true CN114076857A (en) | 2022-02-22 |
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| CN202010827450.3A Pending CN114076857A (en) | 2020-08-17 | 2020-08-17 | Current transformer test platform and test method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071163A (en) * | 2007-06-29 | 2007-11-14 | 株洲南车时代电气股份有限公司 | Current converter test circuit |
| CN101738553A (en) * | 2009-12-25 | 2010-06-16 | 三一电气有限责任公司 | Universal testing system of frequency transformer and current transformer |
| CN203385797U (en) * | 2012-12-22 | 2014-01-08 | 北京科诺伟业科技股份有限公司 | Power test platform for full power converter |
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2020
- 2020-08-17 CN CN202010827450.3A patent/CN114076857A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071163A (en) * | 2007-06-29 | 2007-11-14 | 株洲南车时代电气股份有限公司 | Current converter test circuit |
| CN101738553A (en) * | 2009-12-25 | 2010-06-16 | 三一电气有限责任公司 | Universal testing system of frequency transformer and current transformer |
| CN203385797U (en) * | 2012-12-22 | 2014-01-08 | 北京科诺伟业科技股份有限公司 | Power test platform for full power converter |
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