CN206649096U - The load testing circuit of alternating current-direct current frequency converter - Google Patents
The load testing circuit of alternating current-direct current frequency converter Download PDFInfo
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- CN206649096U CN206649096U CN201720479261.5U CN201720479261U CN206649096U CN 206649096 U CN206649096 U CN 206649096U CN 201720479261 U CN201720479261 U CN 201720479261U CN 206649096 U CN206649096 U CN 206649096U
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- frequency converter
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- contactor
- transformer
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Abstract
The utility model discloses a kind of load testing circuit of alternating current-direct current frequency converter, including power supply, the output end of the power supply is connected with the input of the inversion module of tested frequency converter, the output end of the inversion module of the tested frequency converter and the input of transformer connect, the output end of the input of the transformer connects respectively at first contactor with the input of second contactor, the output end of the first contactor is connected with the input of the first rectification module of the tested frequency converter, the output end of first rectification module of the tested frequency converter is connected with the input of the inversion module of the tested frequency converter；The output end of the second contactor is connected with the second rectification module NFE input, and the output end of the second rectification module NFE is connected with the input of the inversion module of the tested frequency converter.The beneficial effects of the utility model are mainly reflected in：Configuration is simple exquisite, and simple operation, test scope is extensive, test frequency converter's system of efficient energy-saving.
Description
Technical field
Converter technology field is the utility model is related to, specifically, more particularly to the load testing of alternating current-direct current frequency converter
Circuit.
Background technology
With the development of Power Electronic Technique, high voltage converter is widely used in electric power, metallurgy, petrochemical industry, running water, coal
Deng field, substantial amounts of electric energy is saved, creates considerable economic benefit and social benefit.
The manufacturer of current transformer or frequency converter need to be tested its various performance before its product export.Aging is surveyed
Examination is exactly to simulate the electrical feature oepration at full load of actual loading, to test the inverter of current transformer or frequency converter, drive circuit
Deng.Total power burn-in test is a very important ring in current transformer or frequency converter reliability testing, especially for the big work(of high pressure
The current transformer and frequency converter of rate.It is main using the total power burn in test circuit of more high-power converter or frequency converter at present
It is divided into following several classes.
The resistance reactance that application number CN200710123594.5 Chinese invention patent gives a kind of straight-friendship inverter is born
Burn in test circuit is carried, realizes that controlled energy circulation is reciprocal by the reactive power in control bus electric capacity and imaginary loading,
But because it is reactive power that output is most of, the input rectifying bridge of frequency converter will be unable to provide total power aging condition, and still
Larger ohmic load active loss be present, it is less efficient.
CN201220260394.0 Chinese invention patent gives a kind of motor-generator set structure burn-in test electricity
Road, the electric energy that tested frequency converter exports can be fed back to power network in part by way of electric energy-mechanic energy-electric energy, advantage is
Load used is actual loading, and test condition is true；Shortcoming is that intermediate link is more, and system architecture is complicated, mechanical system and electricity
Energy pick-up device loss is larger, and system effectiveness is not high.
Application number CN201210407764.3 Chinese invention patent gives a kind of high voltage converter and passes through grid-connected reactance
The burn in test circuit of the grid-connected feedback of device, there is higher system effectiveness, but need additional sample circuit and control unit, output electricity
Flow control algorithm is excessively multiple, and is not used to input side not because that can not realize uncontrollable rectifier-inversion system energy circulation flowing
Control the frequency converter of rectification.
It is complete that application number CN201310325114.9 Chinese invention patent gives a kind of current transformer or frequency converter self-loopa
Power aging test circuit, provide busbar voltage operating point by direct current network and active loss supplements, pass through step-up transformer control
Energy processed is circulated from output end to input, is tested transducer control circuit and is embedded burn-in test module, without outer stiffened
Part sample circuit, test system structure is relatively easy, and efficiency is higher；But it is only capable of by controlling output modulation ratio to adjust output current
Amplitude size, need to debug repeatedly in actual use until output current amplitude meets test condition, time and effort consuming；And for direct current
Because no rectification module is can not test for inverter.
Have that configuration is complicated, operation is inconvenient, less efficient in above-mentioned involved inverter load test circuit and
The shortcomings of test product narrow range.
Utility model content
The purpose of this utility model is to overcome the shortcomings of the prior art, there is provided a kind of load of alternating current-direct current frequency converter is surveyed
Try circuit.
The purpose of this utility model is achieved through the following technical solutions：
A kind of load testing circuit of alternating current-direct current frequency converter, including power supply, the output end of the power supply and tested frequency converter
Inversion module input connection, the input of the output end of the inversion module of the tested frequency converter and transformer connects,
The output end of the input of the transformer connects respectively at first contactor with the input of second contactor, and described first connects
The output end of tentaculum is connected with the input of the first rectification module of the tested frequency converter, and the first of the tested frequency converter is whole
The output end of flow module is connected with the input of the inversion module of the tested frequency converter；The output end of the second contactor with
Second rectification module NFE input connection, the output end of the second rectification module NFE are inverse with the tested frequency converter
Become the input connection of module.
Preferably, the output voltage of the power supply is equal to the voltage of the tested frequency converter.
Preferably, the transformer is step-up transformer.
Preferably, it is additionally provided with power factor compensation device at the transformer.
Preferably, the first contactor and second contactor are interlocking structure.
The beneficial effects of the utility model are mainly reflected in：Configuration is simple exquisite, and simple operation, test scope is extensive, section
Efficiently, and it can will not pollute power network.
Brief description of the drawings
Technical solutions of the utility model are described further below in conjunction with the accompanying drawings：
Fig. 1：Structural representation of the present utility model.
Embodiment
The utility model is described in detail below with reference to embodiment shown in the drawings.But these embodiment party
Formula is not limited to the utility model, structure that one of ordinary skill in the art is made according to these embodiments, method or
Conversion functionally is all contained in the scope of protection of the utility model.
As shown in figure 1, the utility model discloses a kind of load testing circuit of alternating current-direct current frequency converter, including power supply 1, institute
The input for stating the output end of power supply 1 and the inversion module 2 of tested frequency converter is connected, and the voltage of the tested frequency converter is equal to institute
State the output voltage of power supply 1.The output end of the inversion module 2 of the tested frequency converter is connected with the input of transformer 3, described
The output end of the input of transformer 3 connects respectively at the input of first contactor 4 with second contactor 5, and described first connects
The output end of tentaculum 4 is connected with the input of the second rectification module 6 of the tested frequency converter, and the second of the tested frequency converter
The output end of rectification module 6 is connected with the input of the inversion module 2 of the tested frequency converter；The second contactor 5 it is defeated
Go out end to be connected with the second rectification module NFE7 input, output end and the tested frequency conversion of the second rectification module NFE7
The input connection of the inversion module 2 of device.
The transformer 3 is step-up transformer 3, usual to cross the model 690/551 used, is also set at the transformer 3
Power factor compensation device 8, the power factor compensation device 8 is considers ripple capacitor, to the idle work(in reduction system
Rate, so as to reduce the dynamic property in loss and improvement loop.
The first contactor 4 and second contactor 5 are interlocking structure.
Simple distance illustrates the course of work of the present utility model below, as follows：
It is 400V when testing a specified input terminal voltage, when rated current is 50A frequency converter, the frequency converter input
The DC voltage at end is 400V*1.35=540V, and above-mentioned coefficient 1.35 is what DC voltage obtained except alternating voltage, is a warp
Value is tested, now, sets the parameter of the frequency converter as follows：Motor maximum current 50A, Rated motor alternating voltage are（400+
30）/ (690/551)=344V, the ratio of 690/551 gained is step-up ratio, and it is to make the transformer defeated that coefficient 30, which is,
Go out terminal voltage and be higher than the inverter input voltage, so that row is into electric current, 30 be also experience digit, and certainly, coefficient also may be used
To be 40 or 50 etc., when a test is begun, the adhesive of first contactor 4, due to the first contactor 4 and second contactor
5 be interlocking structure, and the second contactor 5 disconnects, and the voltage of the frequency converter is equal to the output voltage of the power supply 1, so
The DC voltage of the output end of the power supply 1 is 540V, the input of the output end of the power supply 1 and the inversion module 2 of frequency converter
End connection, the alternating voltage of the output end of the inversion module 2 of the frequency converter are the rated voltage 344V of motor, the frequency converter
The output end of inversion module 2 be connected with the input of the transformer 3, then the output end of the output end of the transformer 3
Output voltage is 344* (690/551)=430V, the input connection of the second rectification module 6 of the frequency converter and the transformation
The output end connection of device 3, then the input ac voltage of the input of the second rectification module 6 of the frequency converter is 430V, institute
The output DC voltage for stating the output end of the second rectification module 6 of frequency converter is 430*1.35=580V, because 580V is higher than 540V
Voltage, so the input of the frequency converter and output end form loop.In motion process, the frequency converter in itself can be real
When detect output loop electric current, such as when being higher than 50A, the frequency converter can lower output voltage automatically, when being less than 50A if improve
Output voltage, frequency converter just no longer adjusts output voltage and stable operation after reaching setting value 50A, because of institute in motion process
The energy loss for stating frequency converter heating loss itself and the step-up transformer 3 is then supplemented by the power supply 1.
When the inverter that one specified input direct voltage of test is 575V, when rated current is 100A frequency converter, institute
The DC voltage for stating inverter input is 575V, the adhesive of second contactor 5, and the first contactor 4 and second contacts
Device 5 is interlocking structure, and the first contactor 4 disconnects, and sets converter parameter as follows：Motor maximum current is 100A, motor
Rated voltage=（575+50）/ 1.35/ (690/551)=370V, coefficient 50 are to be to make the transformer output end voltage high
In the inverter input voltage, so that row is into electric current, 50 be also experience digit, certainly, coefficient also other numerical value, works as survey
After runin is begun, the alternating voltage of the output end output of the inversion module 2 of the frequency converter is 370V, after step-up transformer 3
Its alternating voltage is changed into 370* (690/551)=462V, because the second contactor 5 is in order at attracting state, by the second rectification
Module NFE is changed into direct current 462*1.35=624V, so the voltage of the second rectification module NFE input is 624V, because of 624V
Higher than the presence of 575V voltage differences, so the inverter input and output end current loop are formed, in running,
Frequency converter can detect output loop electric current in real time in itself, and when being such as higher than 100A, frequency converter can lower output voltage automatically, such as be less than
Output voltage is then improved during 100A, frequency converter just no longer adjusts output voltage and stable operation after reaching setting value 100A.
Because the energy loss of frequency converter heating loss itself and step-up transformer 3 is then supplemented by the power supply 1 in running.
The beneficial effects of the utility model are mainly reflected in：Configuration is simple exquisite, and simple operation, test scope is extensive, section
Can efficient test frequency converter's system.
It should be appreciated that although the present specification is described in terms of embodiments, not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that those skilled in the art will should say for clarity
For bright book as an entirety, the technical scheme in each embodiment may also be suitably combined to form those skilled in the art can
With the other embodiment of understanding.
The a series of tool described in detail only for feasibility embodiment of the present utility model of those listed above
Body illustrates that they are simultaneously not used to limit the scope of protection of the utility model, all to be made without departing from the utility model skill spirit
Equivalent implementations or change should be included within the scope of protection of the utility model.
Claims (5)
1. the load testing circuit of alternating current-direct current frequency converter, it is characterised in that：Including power supply（1）, the power supply（1）Output end with
The inversion module of tested frequency converter（2）Input connection, the inversion module of the tested frequency converter（2）Output end and transformation
Device（3）Input connection, the transformer（3）Input output end respectively at first contactor（4）With the second contact
Device（5）Input connection, the first contactor（4）Output end and the tested frequency converter the second rectification module（6）
Input connection, the second rectification module of the tested frequency converter（6）Output end and the tested frequency converter inversion mould
Block（2）Input connection；The second contactor（5）Output end and the second rectification module NFE（7）Input connection,
The second rectification module NFE（7）Output end and the tested frequency converter inversion module（2）Input connection.
2. the load testing circuit of alternating current-direct current frequency converter according to claim 1, it is characterised in that：The power supply（1）'s
Output voltage is equal to the voltage of the tested frequency converter.
3. the load testing circuit of alternating current-direct current frequency converter according to claim 1, it is characterised in that：The transformer（3）
For step-up transformer.
4. the load testing circuit of alternating current-direct current frequency converter according to claim 1, it is characterised in that：The transformer（3）
Place is additionally provided with power factor compensation device（8）.
5. the load testing circuit of alternating current-direct current frequency converter according to claim 1, it is characterised in that：The first contactor
（4）And second contactor（5）For interlocking structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720479261.5U CN206649096U (en) | 2017-05-03 | 2017-05-03 | The load testing circuit of alternating current-direct current frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720479261.5U CN206649096U (en) | 2017-05-03 | 2017-05-03 | The load testing circuit of alternating current-direct current frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206649096U true CN206649096U (en) | 2017-11-17 |
Family
ID=60276748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720479261.5U Expired - Fee Related CN206649096U (en) | 2017-05-03 | 2017-05-03 | The load testing circuit of alternating current-direct current frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206649096U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076865A (en) * | 2021-09-29 | 2022-02-22 | 广东新昇电业科技股份有限公司 | Converter aging testing system |
-
2017
- 2017-05-03 CN CN201720479261.5U patent/CN206649096U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076865A (en) * | 2021-09-29 | 2022-02-22 | 广东新昇电业科技股份有限公司 | Converter aging testing system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171117 Termination date: 20200503 |