CN104316796B - A kind of high-power Harmonic Current characteristic test system and method - Google Patents
A kind of high-power Harmonic Current characteristic test system and method Download PDFInfo
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Abstract
The invention discloses a kind of high-power Harmonic Current characteristic test system and method, the system includes harmonic conversion power supply, harmonic wave transformer, power frequency supply, Industrial Frequency Transformer and power control system；The input of the harmonic conversion power supply and power frequency supply is exchanged with 380V and is electrically connected, and the output end of the harmonic conversion power supply is connected with the input of harmonic wave transformer；The output end of the harmonic conversion power supply is connected with the input of power control system, and the harmonic conversion power supply is controlled by power control system；Harmonic characterisitic experiment is carried out with the method, the harmonic signal of multi-frequency combination can be obtained, meet the defect the need for actual harmonic wave is tested.System architecture is simple, small volume, lightweight, debugging are simple, and the harmonic parameters that can be exported with online updating, noise is also small.Be conducive to being best understood from mains by harmonics characteristic using the test method, improve the power network quality of power supply and security.
Description
Technical field
The invention belongs to electrical engineering field, more particularly to a kind of high-power Harmonic Current characteristic test system and method.
Background technology
Power reactor, the harmonic noise of capacitor are to influence power capacitor, the world of reactor long-term safety operation
Property problem.As harmonic wave control and reactive-load compensation are improved by attention degree, and direct current transportation, the extensive of generation of electricity by new energy are answered
With the growth increasingly of power capacitor and smoothing reactor consumption, to its technical requirements also more and more higher.It is limited to prior art
Level, harmonic wave experimental facilities common in the market can only be taken or using the multiple strings of single-frequency intermediate frequency power supply using power frequency equivalent generation
Join, not only troublesome poeration, and do not meet practical operation situation, it is impossible to which the harmonic signal of multi-frequency combination is provided, it is difficult to be full
The need for full border harmonic test.
The noise experiment in harmonic wave experiment is such as carried out, using bridge circuit of the prior art, total voltage and total current are all
For single test product is 2 times, when wherein test product (LKK-35-1251-11.021) carries out the test of 11 subharmonic, voltage and current difference
Reached 38775V and 1018.1A, it is required it is idle be 1018.11*38.775=39498kVA, so system is total idle being
39498*4=157992kVA, it is assumed that Harmonic Current capacity is 800KVA, then 157992/800=197.5, so compensation Q values are needed
Reaching 197.5 could meet requirement, but system q in practice may not reach 197.5.
Test product (LKK-35-1251-11.021) appearance and size 3.8x3.8x6.2m, bulky dimensions involve great expense, and bridge-type
Circuit needs 4 simultaneously, while require 3 in addition to test product, without any electrical problems ensureing not produce any shadow to test product
Ring.
Intermediate-frequency transformer frequency range：50~2500Hz, because frequency is wide, impedance voltage refers at 50 hz in practice
Value, so frequency to get over high-output power smaller.We are by taking 11 subharmonic in test product (LKK-35-1251-11.021) as an example：It is false
If intermediate-frequency transformer impedance voltage 5%, the impedance voltage under 11 subharmonic is power output under 5*11=55%, i.e. 11 subharmonic
It is specified 42%, there is larger energy loss.
Therefore, a kind of new high-power Harmonic Current characteristic test apparatus are developed imperative.
The content of the invention
The present invention is for harmonic wave experimental facilities troublesome poeration in known technology, it is impossible to provide the harmonic wave letter of multi-frequency combination
Number, the Harmonic Current characteristic test system and method for a kind of high-power multi-frequency combination are designed, it is harmonic wave control technology and electricity
The resistance to harmonic wave ability of power equipment provides checking means and technical equipment.
A kind of high-power Harmonic Current characteristic test system, including harmonic conversion power supply, harmonic wave transformer, power frequency supply,
Industrial Frequency Transformer, power control system and measurement apparatus；
The input of the harmonic conversion power supply is exchanged with 380V and is electrically connected, the output end of the harmonic conversion power supply with it is humorous
The input of wave transformer is connected, and the output end of the harmonic wave transformer is connected with test product,
The input of the power frequency supply is exchanged with 380V and is electrically connected, the output end and Industrial Frequency Transformer of the power frequency supply
Input be connected, the output end of the Industrial Frequency Transformer is connected with test product；
The air-gap-free iron core that iron core in the harmonic wave transformer is made for banding non-crystalline material winding；
The Industrial Frequency Transformer exports power frequency supply by power frequency passage, and the harmonic wave transformer is exported by harmonic wave passage
Harmonic Current, the power frequency supply harmonic power supply is conveyed to test product be superimposed simultaneously after；
The input of the measurement apparatus is connected with the signal loading end of test product；
The output end of the harmonic conversion power supply, power frequency supply and measurement apparatus with the input phase of power control system
Even, the harmonic conversion power supply and power frequency supply are controlled by power control system；
The harmonic conversion power supply includes that the standard harmonic of multi-frequency combination and online updating parameter is supported in Frequency Adjustable amplitude modulation
Source and full bridge power amplifying circuit；
The output end in the standard harmonic source is connected with the input of full bridge power amplifying circuit；
The test product is capacitor or power reactor.
The power frequency passage only transmits power frequency component, and the harmonic wave passage only transmits harmonic signal；
One end of the Industrial Frequency Transformer is connected with the loading end of test product, and the other end is grounded by power frequency passage；
One end of the harmonic wave transformer is connected by harmonic wave passage with the loading end of test product, other end ground connection；
Power compensating device is additionally provided between the test product and harmonic wave transformer and Industrial Frequency Transformer.
【When the test product is power reactor, the power compensating device is connected with test product；The test product is capacitor
When, the power compensating device is in parallel with test product.】
【Power back-off is carried out to test product capacity using power compensating device, the power to providing power drops significantly
It is low；】
The harmonic conversion power supply is using multiple harmonic conversion power sources in parallel.
The multiple harmonic conversion power supply in parallel is cabinet type connect-disconnect structure.
Using the harmonic conversion power supply of multiple cabinet type connect-disconnect structures in parallel, the electric current of single power supply is small, low in energy consumption, relatively
In whole machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can be with single maintenance；
The standard harmonic source by 32 DSP, ultra-large CPLD, the memory of 32, the analog-digital converter of 12,
Output filter is constituted, and the DSP output ends are connected with ultra-large CPLD inputs, and memory is two-way with ultra-large CPLD
Connection；Ultra-large CPLD output ends are connected with the input of analog-digital converter, and output end and the output of analog-digital converter are filtered
Device is connected.
The harmonic conversion power supply also includes the filter circuit being connected with full bridge power amplification circuit output end.
The full bridge power amplifying circuit constitutes full-bridge amplification matrix by 4 bridge arms, and each bridge arm is made up of an IGBT
Or be made up of the IGBT parallel connections of two or more same model.
The harmonic conversion power supply also includes the protection circuit being connected with full bridge power input amplifier, the protection
The input of circuit is connected with power circuit.
A kind of high-power Harmonic Current characteristic test method, using described high-power Harmonic Current characteristic test system,
The harmonic wave of frequency needed for being produced using harmonic conversion power supply, harmonic wave transformer is defeated by harmonic conversion power supply using electromagnetic induction principle
The harmonic wave for going out boosts to required magnitude of voltage；Industrial Frequency Transformer is boosted the signal that power frequency supply is exported, and the power frequency becomes
The signal of signal and harmonic wave the step-up transformer output of depressor output respectively by the output of power frequency passage harmonic passage after, while
It is loaded on test product, power back-off is carried out to the capacity of test product using power compensating device, measurement apparatus collection is loaded into
Signal on test product；Power control system is gathered according to harmonic conversion power supply and the signal and measurement apparatus of power frequency supply output
Signal is controlled to harmonic conversion power supply and power frequency supply, the harmonic signal needed for obtaining test product；
The power control system control process is as follows：
First, self-control is carried out to harmonic conversion power supply and power frequency supply using power control system；
1) by the output voltage of power control system collection harmonic conversion power supply, current signal and harmonic wave each harmonic content
Harmonic conversion power output signal with setting is compared, if difference between the two has exceeded the first allowable error of setting
Scope, then power control system control harmonic conversion power supply, until difference between the two be no more than the first allowable error scope；
2) output voltage and current signal of power control system collection power frequency supply are exported with the power frequency supply of setting
Signal is compared, if difference between the two has exceeded the 3rd allowable error scope of setting, power control system control
Power frequency variable-frequency power sources, until difference between the two is no more than the 3rd allowable error scope；
Then, feedback regulation is carried out to harmonic conversion power supply according to measurement signal；
The signal being loaded on test product that measurement apparatus are gathered is compared with the setting signal needed for test product, if both
Between difference exceeded setting the second allowable error scope, then power control system control harmonic conversion power supply, until two
Difference between person is no more than the second allowable error scope, realizes the full-automatic control of high-power Harmonic Current characteristic test method
System, there is provided the power supply signal of various needs.
Harmonic conversion power input voltage exchanges 380V, is output as 50Hz~2500Hz harmonic voltages, maximum harmonic current
Can exceed 2500A, harmonic wave with 50Hz as step-by-step adjustment, once support 12 kinds of harmonic superpositions of different frequency, each harmonic it is big
It is small individually to adjust；Boosted by harmonic wave step-up transformer, reach the magnitude of voltage of test requirements document.
Beneficial effect
The invention provides a kind of high-power Harmonic Current that harmonic wave experiment is carried out to power capacitor and smoothing reactor
Bridge circuit in characteristic test system and method, with conventional process of the prior art is completely different, is testing a test product
When need to increase by three test products, be barricaded as bridge circuit to provide harmonic signal for test product, and the present invention is by using harmonic conversion
Harmonic signal needed for power supply output, when testing a test product, without increasing by three extra test products, using power supply control
System monitor in real time processed, feedback regulation control harmonic conversion power supply, solving the single-phase Harmonic Current of current like product can not carry
For the harmonic signal of multi-frequency combination, it is impossible to meet the defect the need for actual harmonic wave is tested.Using power frequency passage harmonic
Passage conveys power frequency component harmonic signal respectively so that both do not interfere with each other；Using power compensating device to test product capacity
Power back-off is carried out, the power to providing power is substantially reduced；Meanwhile, system architecture of the present invention is simple, small volume,
Lightweight, debugging is simple, without adjusting the base bias voltage of power discharging transistor, can export the combination of up to eight channel frequences,
The harmonic parameters that can be exported with online updating, noise is also small.Using the harmonic conversion power supply of multiple cabinet type connect-disconnect structures in parallel,
The electric current of single power supply is small, low in energy consumption, and relative to whole machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can be with
Single maintenance；It is easy to flow, controls the precision of whole power supply；Be conducive to being best understood from mains by harmonics spy using the test method
Property, improve the power network quality of power supply and security.
Brief description of the drawings
Fig. 1 is the structural representation one of system of the present invention；
Fig. 2 is the block diagram in the standard harmonic source；
Fig. 3 is the full bridge power amplification circuit structure figure.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in figure 1, a kind of high-power Harmonic Current characteristic test system, including harmonic conversion power supply, harmonic wave transformer,
Power frequency supply, Industrial Frequency Transformer, power control system and measurement apparatus；；
The input of the harmonic conversion power supply is exchanged with 380V and is electrically connected, the output end of the harmonic conversion power supply with it is humorous
The input of wave transformer is connected, and the output end of the harmonic wave transformer is connected with test product,
The input of the power frequency supply is exchanged with 380V and is electrically connected, the output end and Industrial Frequency Transformer of the power frequency supply
Input be connected, the output end of the Industrial Frequency Transformer is connected with test product；
The air-gap-free iron core that iron core in the harmonic wave transformer is made for banding non-crystalline material winding；
The Industrial Frequency Transformer exports power frequency supply by power frequency passage, and the harmonic wave transformer is exported by harmonic wave passage
Harmonic Current, the power frequency supply harmonic power supply is conveyed to test product be superimposed simultaneously after；
The input of the measurement apparatus is connected with the signal loading end of test product；
The output end of the harmonic conversion power supply, power frequency supply and measurement apparatus with the input phase of power control system
Even, the harmonic conversion power supply and power frequency supply are controlled by power control system；
The harmonic conversion power supply includes that the standard harmonic of multi-frequency combination and online updating parameter is supported in Frequency Adjustable amplitude modulation
Source and full bridge power amplifying circuit；
The output end in the standard harmonic source is connected with the input of full bridge power amplifying circuit；
The test product is capacitor or power reactor.
The power frequency passage only transmits power frequency component, and the harmonic wave passage only transmits harmonic signal；
One end of the Industrial Frequency Transformer is connected with the loading end of test product, and the other end is grounded by power frequency passage；
One end of the harmonic wave transformer is connected by harmonic wave passage with the loading end of test product, other end ground connection；
Power compensating device is additionally provided between the test product and harmonic wave transformer and Industrial Frequency Transformer.
【When the test product is power reactor, the power compensating device is connected with test product；The test product is capacitor
When, the power compensating device is in parallel with test product.】
The harmonic conversion power supply is using multiple harmonic conversion power sources in parallel.
The multiple harmonic conversion power supply in parallel is cabinet type connect-disconnect structure.
Using the harmonic conversion power supply of multiple cabinet type connect-disconnect structures in parallel, the electric current of single power supply is small, low in energy consumption, relatively
In whole machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can be with single maintenance；
As shown in Fig. 2 DSP11, ultra-large CPLD14, memory I area 12,32 of 32 of the standard harmonic source by 32
The analog-digital converter III of the analog-digital converter II 16,12 of the analog-digital converter I 15,12 in 13,12, IIth area of memory of position
17th, output filter I 18, output filter II 19 and output filter III 10 are constituted, the DSP11 output ends with it is ultra-large
CPLD14 inputs are connected, and the area 12 of memory I and the area 13 of 32 memory II are bi-directionally connected with ultra-large CPLD14；Super large is advised
Mould CPLD14 output ends are defeated with the input of analog-digital converter I 15, the input of analog-digital converter II 16, analog-digital converter III 17 respectively
Enter end connection, the output end of analog-digital converter I 15 is connected with output filter I 18, and the output end of analog-digital converter II 16 is filtered with output
Ripple device II 19 is connected, and the output end of analog-digital converter III 17 is connected with output filter III 10, and standard harmonic source exports including three tunnels,
Per road, the harmonic frequency of output can freely set between 0.1Hz -1MHz.
The harmonic conversion power supply also includes the filter circuit being connected with full bridge power amplification circuit output end.
The full bridge power amplifying circuit constitutes full-bridge amplification matrix by 4 bridge arms, and each bridge arm is made up of an IGBT
Or be made up of the IGBT parallel connections of two or more same model.
As shown in figure 3, the harmonic signal voltage that standard harmonic source is sent out, sending into full bridge power amplifying circuit 2 carries out power
Amplify and then export.Full bridge power amplifying circuit constitutes full-bridge amplification matrix by 4 bridge arms, and each bridge arm is by an IGBT structure
Into IGBT is worked with on-off mode, and electric current feeds back in the DC filter capacitor in parallel with IGBT in switching process, carries out nothing
Work(is exchanged, and advantageously reduces heating, strengthens the ability with reactive load.
The harmonic conversion power supply also includes the protection circuit being connected with full bridge power input amplifier, the protection
The input of circuit is connected with power circuit.
A kind of high-power Harmonic Current characteristic test method, using described high-power Harmonic Current characteristic test system,
The harmonic wave of frequency needed for being produced using harmonic conversion power supply, harmonic wave transformer is defeated by harmonic conversion power supply using electromagnetic induction principle
The harmonic wave for going out boosts to required magnitude of voltage；Industrial Frequency Transformer is boosted the signal that power frequency supply is exported, and the power frequency becomes
The signal of signal and harmonic wave the step-up transformer output of depressor output respectively by the output of power frequency passage harmonic passage after, while
It is loaded on test product, power back-off is carried out to the capacity of test product using power compensating device, measurement apparatus collection is loaded into
Signal on test product；Power control system is gathered according to harmonic conversion power supply and the signal and measurement apparatus of power frequency supply output
Signal is controlled to harmonic conversion power supply and power frequency supply, the harmonic signal needed for obtaining test product；
The power control system control process is as follows：
First, self-control is carried out to harmonic conversion power supply and power frequency supply using power control system；
1) by the output voltage of power control system collection harmonic conversion power supply, current signal and harmonic wave each harmonic content
Harmonic conversion power output signal with setting is compared, if difference between the two has exceeded the first allowable error of setting
Scope, then power control system control harmonic conversion power supply, until difference between the two be no more than the first allowable error scope；
2) output voltage and current signal of power control system collection power frequency supply are exported with the power frequency supply of setting
Signal is compared, if difference between the two has exceeded the 3rd allowable error scope of setting, power control system control
Power frequency variable-frequency power sources, until difference between the two is no more than the 3rd allowable error scope；
Then, feedback regulation is carried out to harmonic conversion power supply according to measurement signal；
The signal being loaded on test product that measurement apparatus are gathered is compared with the setting signal needed for test product, if both
Between difference exceeded setting the second allowable error scope, then power control system control harmonic conversion power supply, until two
Difference between person is no more than the second allowable error scope, realizes the full-automatic control of high-power Harmonic Current characteristic test method
System, there is provided the power supply signal of various needs.
Harmonic conversion power input voltage exchanges 380V, is output as 50Hz~2500Hz harmonic voltages, maximum harmonic current
Can exceed 2500A, harmonic wave with 50Hz as step-by-step adjustment, once support 12 kinds of harmonic superpositions of different frequency, each harmonic it is big
It is small individually to adjust；Boosted by harmonic wave step-up transformer, reach the magnitude of voltage of test requirements document.
Claims (1)
1. a kind of high-power Harmonic Current characteristic test method, it is characterised in that using a kind of high-power Harmonic Current characteristic examination
Check system, pilot system include harmonic conversion power supply, harmonic wave transformer, power frequency supply, Industrial Frequency Transformer, power control system and
Measurement apparatus；
The input of the harmonic conversion power supply is exchanged with 380V and is electrically connected, and output end and the harmonic wave of the harmonic conversion power supply become
The input of depressor is connected, and the output end of the harmonic wave transformer is connected with test product,
The input of the power frequency supply is exchanged with 380V and is electrically connected, and the output end of the power frequency supply is defeated with Industrial Frequency Transformer
Enter end to be connected, the output end of the Industrial Frequency Transformer is connected with test product；
The air-gap-free iron core that iron core in the harmonic wave transformer is made for banding non-crystalline material winding；
The Industrial Frequency Transformer exports power frequency supply by power frequency passage, and the harmonic wave transformer passes through harmonic wave passage output harmonic wave
Power supply, the power frequency supply harmonic power supply is conveyed to test product be superimposed simultaneously after；
The input of the measurement apparatus is connected with the signal loading end of test product；
The output end of the harmonic conversion power supply, power frequency supply and measurement apparatus is connected with the input of power control system,
The harmonic conversion power supply and power frequency supply are controlled by power control system；
The harmonic conversion power supply include Frequency Adjustable amplitude modulation support multi-frequency combination and online updating parameter standard harmonic source and
Full bridge power amplifying circuit；
The output end in the standard harmonic source is connected with the input of full bridge power amplifying circuit；
The test product is capacitor or power reactor；
Power compensating device is additionally provided between the test product and harmonic wave transformer and Industrial Frequency Transformer；
The harmonic conversion power supply is using multiple harmonic conversion power sources in parallel；
The multiple harmonic conversion power supply in parallel is cabinet type connect-disconnect structure；
The standard harmonic source by 32 DSP, ultra-large CPLD, the memory of 32, the analog-digital converter of 12, output
Wave filter is constituted, and the DSP output ends are connected with ultra-large CPLD inputs, memory and the two-way companies of ultra-large CPLD
Connect；Ultra-large CPLD output ends are connected with the input of analog-digital converter, the output end and output filter of analog-digital converter
Connection；
The harmonic conversion power supply also includes the filter circuit being connected with full bridge power amplification circuit output end；
The full bridge power amplifying circuit constitutes full-bridge amplification matrix by 4 bridge arms, each bridge arm be made up of an IGBT or by
The IGBT of two or more same model is in parallel to be constituted；
The harmonic conversion power supply also includes the protection circuit being connected with full bridge power input amplifier, the protection circuit
Input be connected with power circuit；
The harmonic wave of frequency needed for being produced using harmonic conversion power supply, harmonic wave transformer is electric by harmonic conversion using electromagnetic induction principle
The harmonic wave of source output boosts to required magnitude of voltage；Industrial Frequency Transformer is boosted the signal that power frequency supply is exported, the work
The signal of signal and harmonic wave the step-up transformer output of frequency power transformer output respectively by the output of power frequency passage harmonic passage after,
It is loaded on test product simultaneously, power back-off is carried out to the capacity of test product using power compensating device, measurement apparatus collection adds
It is downloaded to the signal on test product；The signal and measurement apparatus that power control system is exported according to harmonic conversion power supply with power frequency supply are adopted
The signal of collection is controlled to harmonic conversion power supply and power frequency supply, the harmonic signal needed for obtaining test product；
The power control system control process is as follows：
First, self-control is carried out to harmonic conversion power supply and power frequency supply using power control system；
1) power control system is gathered output voltage, current signal and the harmonic wave each harmonic content of harmonic conversion power supply and is set
Fixed harmonic conversion power output signal is compared, if difference between the two has exceeded the first allowable error model of setting
Enclose, then power control system control harmonic conversion power supply, until difference between the two is no more than the first allowable error scope；
2) by the output voltage and current signal of power control system collection power frequency supply and the power frequency supply output signal for setting
It is compared, if difference between the two has exceeded the 3rd allowable error scope of setting, power control system control power frequency
Variable-frequency power sources, until difference between the two is no more than the 3rd allowable error scope；
Then, feedback regulation is carried out to harmonic conversion power supply according to measurement signal；
The signal being loaded on test product that measurement apparatus are gathered is compared with the setting signal needed for test product, if between the two
Difference exceeded setting the second allowable error scope, then power control system control harmonic conversion power supply, until both it
Between difference be no more than the second allowable error scope, realize the Automatic Control of high-power Harmonic Current characteristic test method, carry
For the power supply signal of various needs.
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| CN107579665B (en) * | 2017-09-30 | 2023-07-11 | 广东电网有限责任公司电力科学研究院 | High-voltage harmonic voltage source |
| CN108226587B (en) * | 2018-03-19 | 2020-10-27 | 中煤科工集团重庆研究院有限公司 | Mining high-low voltage reactive power and harmonic compensation device based on cancellation method |
| CN110441664A (en) * | 2019-08-30 | 2019-11-12 | 国网江苏省电力有限公司电力科学研究院 | A kind of lower Partial Discharge Measurement System of harmonic voltage effect |
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| CN204203379U (en) * | 2014-10-24 | 2015-03-11 | 国家电网公司 | A kind of high-power Harmonic Current characteristic test system |
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