CN104316796A - High power harmonic power supply characteristic testing system and method - Google Patents
High power harmonic power supply characteristic testing system and method Download PDFInfo
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- CN104316796A CN104316796A CN201410578335.1A CN201410578335A CN104316796A CN 104316796 A CN104316796 A CN 104316796A CN 201410578335 A CN201410578335 A CN 201410578335A CN 104316796 A CN104316796 A CN 104316796A
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Abstract
The invention discloses a high power harmonic power supply characteristic testing system and method. The system comprises a harmonic variable frequency power supply, a harmonic transformer, an industrial frequency power supply, an industrial frequency transformer and a power supply control system. The input ends of the harmonic variable frequency power supply and the industrial frequency power supply are connected with 380V alternating current, and the output end of the harmonic variable frequency power supply is connected with the input end of the harmonic transformer. The output end of the harmonic variable frequency power supply is connected with the input end of the power control system, and the harmonic variable frequency power supply is controlled by the power supply control system. Harmonic signals of various frequency combinations can be obtained from harmonic characteristic tests conducted through the method, and the requirements of the actual harmonic tests can be obtained. The system is simple in structure, small in size, light in weight, simple in debugging, capable of updating the output harmonic parameters online and small in size. By means of the testing method, the power grid harmonic characteristics can be better understood, and the power quality and safety of the power grid can be improved.
Description
Technical field
The invention belongs to electrical engineering field, particularly relate to a kind of high-power Harmonic Current characteristic test system and method.
Background technology
The harmonic noise of power reactor, capacitor is the global problem affecting power capacitor, the operation of reactor long-term safety.Along with harmonic wave control and reactive-load compensation are by the raising of attention degree, and direct current transportation, generation of electricity by new energy widespread use, the growth increasingly of power capacitor and smoothing reactor consumption, also more and more higher to its technical requirement.Be limited to prior art level, harmonic wave experimental facilities common in the market can only adopt power frequency equivalence generation get or adopt the multiple series connection of single-frequency intermediate frequency power supply, not only troublesome poeration, and do not meet practical operation situation, the harmonic signal that multi-frequency can not be provided to combine, is difficult to the needs of satisfied actual harmonic test.
As carried out the noise experiment in harmonic wave experiment, adopt bridge circuit of the prior art, total voltage and total current are all single test product is 2 times, when wherein test product (LKK-35-1251-11.021) carries out 11 subharmonic test, voltage and current reaches 38775V and 1018.1A respectively, required idle is 1018.11*38.775=39498kVA, so system always idle be 39498*4=157992kVA, suppose that Harmonic Current capacity is 800KVA, then 157992/800=197.5, compensation Q value just can meet the demands so need reach 197.5, but the system q in reality may not reach 197.5.
Test product (LKK-35-1251-11.021) physical dimension 3.8x3.8x6.2m, bulky dimensions, involves great expense, and bridge circuit needs 4 simultaneously, requires 3 except test product simultaneously, without any electrical problems to ensure not produce any impact to test product.
I.F.T. frequency range: 50 ~ 2500Hz, because frequency is wide, actual middle impedance voltage refers to value at 50 hz, so frequency more high-output power is less.We are for 11 subharmonic in test product (LKK-35-1251-11.021): suppose I.F.T. impedance voltage 5%, impedance voltage under 11 subharmonic is 5*11=55%, namely under 11 subharmonic, output power is specified 42%, there is larger energy loss.
Therefore, a kind of novel high-power Harmonic Current characteristic test apparatus is developed imperative.
Summary of the invention
The present invention is directed to harmonic wave experimental facilities troublesome poeration in known technology, the harmonic signal that multi-frequency combines cannot be provided, design a kind of Harmonic Current characteristic test system and method for high-power multi-frequency combination, for harmonic wave control technology and the resistance to harmonic wave ability of power equipment provide checking means and technical equipment.
A kind of high-power Harmonic Current characteristic test system, comprises harmonic conversion power supply, humorous wave transformer, power frequency supply, Industrial Frequency Transformer, power control system and measurement mechanism;
The input end of described harmonic conversion power supply is connected with 380V alternating current, and the output terminal of described harmonic conversion power supply is connected with the input end of humorous wave transformer, and the output terminal of described humorous wave transformer is connected with test product,
The input end of described power frequency supply is connected with 380V alternating current, and the output terminal of described power frequency supply is connected with the input end of Industrial Frequency Transformer, and the output terminal of described Industrial Frequency Transformer is connected with test product;
Iron core in described humorous wave transformer is that banded non-crystalline material reels the air-gap-free iron core made;
Described Industrial Frequency Transformer exports power frequency supply by power frequency passage, and described humorous wave transformer, by harmonic wave passage output harmonic wave power supply, flows to test product after described power frequency supply and Harmonic Current superpose simultaneously;
The input end of described measurement mechanism is connected with the signal loading end of test product;
The output terminal of described harmonic conversion power supply, power frequency supply and measurement mechanism is all connected with the input end of power control system, and described harmonic conversion power supply and power frequency supply are controlled by power control system;
Described harmonic conversion power supply comprises standard harmonic source and the full bridge power amplifying circuit that multi-frequency combination and online updating parameter are supported in Frequency Adjustable amplitude modulation;
The output terminal in described standard harmonic source is connected with the input end of full bridge power amplifying circuit;
Described test product is capacitor or power reactor.
Described power frequency passage only transmits power frequency component, and described harmonic wave passage only transmits harmonic signal;
One end of described Industrial Frequency Transformer is connected with the loading end of test product, and the other end is by power frequency passage ground connection;
One end of described humorous wave transformer is connected with the loading end of test product by harmonic wave passage, other end ground connection;
Described test product and be also provided with power compensating device between humorous wave transformer and Industrial Frequency Transformer.
[when described test product is power reactor, described power compensating device is connected with test product; When described test product is capacitor, described power compensating device is in parallel with test product.】
[utilizing power compensating device to carry out power back-off to test product capacity, greatly reducing providing the power of power; ]
The multiple harmonic conversion power sources in parallel of described harmonic conversion power acquisition.
The harmonic conversion power supply of described multiple parallel connection is cabinet type connect-disconnect structure.
Adopt the harmonic conversion power supply of the cabinet type connect-disconnect structure of multiple parallel connection, the electric current of single power supply is little, low in energy consumption, and relative to complete machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can singlely keep in repair;
Described standard harmonic source is made up of the DSP of 32, ultra-large CPLD, the storer of 32, analog to digital converter, the output filter of 12, and described DSP output terminal is connected with ultra-large CPLD input end, and storer and ultra-large CPLD are bi-directionally connected; Ultra-large CPLD output terminal is connected with the input end of analog to digital converter, and the output terminal of analog to digital converter is connected with output filter.
Described harmonic conversion power supply also comprises the filtering circuit be connected with full bridge power amplification circuit output end.
Described full bridge power amplifying circuit forms full-bridge amplification matrix by 4 brachium pontis, and each brachium pontis is made up of an IGBT or is made up of the IGBT parallel connection of two or more same model.
Described harmonic conversion power supply also comprises the protection circuit be connected with full bridge power input amplifier, and the input end of described protection circuit is connected with power circuit.
A kind of high-power Harmonic Current characteristic test method, high-power Harmonic Current characteristic test system described in employing, utilize harmonic conversion power supply to produce the harmonic wave of required frequency, humorous wave transformer adopts electromagnetic induction principle that the harmonic wave that harmonic conversion power supply exports is boosted to required magnitude of voltage; The signal that power frequency supply exports boosts by Industrial Frequency Transformer, after the signal that described Industrial Frequency Transformer exports and the signal that harmonic wave step-up transformer exports export respectively by power frequency passage and harmonic wave passage, be loaded on test product simultaneously, utilize power compensating device to carry out power back-off to the capacity of test product, measurement mechanism collection is loaded into the signal on test product; The signal of the signal that power control system foundation harmonic conversion power supply and power frequency supply export and measurement mechanism collection controls harmonic conversion power supply and power frequency supply, obtains the harmonic signal needed for test product;
Described power control system control procedure is as follows:
First, power control system is utilized to carry out self-control to harmonic conversion power supply and power frequency supply;
1) power control system is gathered the output voltage of harmonic conversion power supply, the harmonic conversion power output signal of current signal and harmonic wave each harmonic content and setting compares, if difference has between the two exceeded the first permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the first permissible error scope;
2) power frequency supply of the output voltage and current signal and setting that power control system are gathered power frequency supply outputs signal and compares, if difference has between the two exceeded the 3rd permissible error scope of setting, then power control system controls power frequency variable-frequency power sources, until difference is between the two no more than the 3rd permissible error scope;
Then, according to measuring-signal, feedback regulation is carried out to harmonic conversion power supply;
By measurement mechanism collection be loaded into the signal on test product and the setting signal needed for test product compares, if difference has between the two exceeded the second permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the second permissible error scope, realize the Automatic Control of high-power Harmonic Current characteristic test method, the power supply signal of various needs is provided.
Harmonic conversion power input voltage exchanges 380V, export as 50Hz ~ 2500Hz harmonic voltage, maximum harmonic current can more than 2500A, and harmonic wave take 50Hz as step-by-step adjustment, once support the harmonic superposition of 12 kinds of different frequencies, the size of each harmonic can regulate separately; Boosted by harmonic wave step-up transformer, arrive the magnitude of voltage of testing requirements.
Beneficial effect
The invention provides a kind of high-power Harmonic Current characteristic test system and method for power capacitor and smoothing reactor being carried out to harmonic wave experiment, completely different with the bridge circuit in conventional process of the prior art, increase by three test products are needed when a test test product, being barricaded as bridge circuit for test product provides harmonic signal, and the present invention is by utilizing the harmonic signal needed for the output of harmonic conversion power supply, when a test product is tested, without the need to increasing by three extra test products, power control system is adopted to monitor in real time, feedback regulation control harmonic conversion power supply, solve the harmonic signal that the single-phase Harmonic Current of current like product can not provide multi-frequency to combine, the defect of the needs of actual harmonic wave experiment can not be met.Utilize power frequency passage and harmonic wave passage to carry power frequency component and harmonic signal respectively, both are not interfere with each other; Utilizing power compensating device to carry out power back-off to test product capacity, greatly reducing providing the power of power; Meanwhile, system architecture of the present invention is simple, volume is little, lightweight, debugging is simple, need not regulate the base bias voltage of power discharging transistor, can export nearly eight channel frequences combinations, can the harmonic parameters that exports of online updating, and noise is also little.Adopt the harmonic conversion power supply of the cabinet type connect-disconnect structure of multiple parallel connection, the electric current of single power supply is little, low in energy consumption, and relative to complete machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can singlely keep in repair; Be easy to current-sharing, control the precision of whole power supply; Utilize this test method to be conducive to understanding mains by harmonics characteristic better, improve the electrical network quality of power supply and security.
Accompanying drawing explanation
Fig. 1 is the structural representation one of system of the present invention;
Fig. 2 is the block diagram in described standard harmonic source;
Fig. 3 is described full bridge power amplification circuit structure figure.
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, comprises harmonic conversion power supply, humorous wave transformer, power frequency supply, Industrial Frequency Transformer, power control system and measurement mechanism; ;
The input end of described harmonic conversion power supply is connected with 380V alternating current, and the output terminal of described harmonic conversion power supply is connected with the input end of humorous wave transformer, and the output terminal of described humorous wave transformer is connected with test product,
The input end of described power frequency supply is connected with 380V alternating current, and the output terminal of described power frequency supply is connected with the input end of Industrial Frequency Transformer, and the output terminal of described Industrial Frequency Transformer is connected with test product;
Iron core in described humorous wave transformer is that banded non-crystalline material reels the air-gap-free iron core made;
Described Industrial Frequency Transformer exports power frequency supply by power frequency passage, and described humorous wave transformer, by harmonic wave passage output harmonic wave power supply, flows to test product after described power frequency supply and Harmonic Current superpose simultaneously;
The input end of described measurement mechanism is connected with the signal loading end of test product;
The output terminal of described harmonic conversion power supply, power frequency supply and measurement mechanism is all connected with the input end of power control system, and described harmonic conversion power supply and power frequency supply are controlled by power control system;
Described harmonic conversion power supply comprises standard harmonic source and the full bridge power amplifying circuit that multi-frequency combination and online updating parameter are supported in Frequency Adjustable amplitude modulation;
The output terminal in described standard harmonic source is connected with the input end of full bridge power amplifying circuit;
Described test product is capacitor or power reactor.
Described power frequency passage only transmits power frequency component, and described harmonic wave passage only transmits harmonic signal;
One end of described Industrial Frequency Transformer is connected with the loading end of test product, and the other end is by power frequency passage ground connection;
One end of described humorous wave transformer is connected with the loading end of test product by harmonic wave passage, other end ground connection;
Described test product and be also provided with power compensating device between humorous wave transformer and Industrial Frequency Transformer.
[when described test product is power reactor, described power compensating device is connected with test product; When described test product is capacitor, described power compensating device is in parallel with test product.】
The multiple harmonic conversion power sources in parallel of described harmonic conversion power acquisition.
The harmonic conversion power supply of described multiple parallel connection is cabinet type connect-disconnect structure.
Adopt the harmonic conversion power supply of the cabinet type connect-disconnect structure of multiple parallel connection, the electric current of single power supply is little, low in energy consumption, and relative to complete machine formula Large Copacity harmonic conversion power supply, thermal diffusivity is good, and easy care, can singlely keep in repair;
As shown in Figure 2, standard harmonic source is made up of the DSP11 of 32, ultra-large CPLD14, the analog to digital converter III 17 of analog to digital converter II 16,12 of analog to digital converter I 15,12 in 13,12, storer II district in 12,32, storer I district, output filter I 18, output filter II 19 and the output filter III 10 of 32, described DSP11 output terminal is connected with ultra-large CPLD14 input end, and storer II district of storer I district 12 and 32 13 is all bi-directionally connected with ultra-large CPLD14; Ultra-large CPLD14 output terminal is connected with analog to digital converter I 15 input end, analog to digital converter II 16 input end, analog to digital converter III 17 input end respectively, analog to digital converter I 15 output terminal is connected with output filter I 18, analog to digital converter II 16 output terminal is connected with output filter II 19, analog to digital converter III 17 output terminal is connected with output filter III 10, standard harmonic source comprises three tunnels and exports, the harmonic frequency that every road exports can between 0.1Hz-1MHz free setting.
Described harmonic conversion power supply also comprises the filtering circuit be connected with full bridge power amplification circuit output end.
Described full bridge power amplifying circuit forms full-bridge amplification matrix by 4 brachium pontis, and each brachium pontis is made up of an IGBT or is made up of the IGBT parallel connection of two or more same model.
As shown in Figure 3, the harmonic signal voltage that standard harmonic source is sent, feeding full bridge power amplifying circuit 2 carries out power amplification and then exports.Full bridge power amplifying circuit forms full-bridge amplification matrix by 4 brachium pontis, each brachium pontis is made up of an IGBT, IGBT works to operate the patterning process in a switching manner, electric current feeds back in the DC filter capacitor in parallel with IGBT in switching process, carry out reactive power exchange, be conducive to reducing heating, the ability of reinforcing band reactive load.
Described harmonic conversion power supply also comprises the protection circuit be connected with full bridge power input amplifier, and the input end of described protection circuit is connected with power circuit.
A kind of high-power Harmonic Current characteristic test method, high-power Harmonic Current characteristic test system described in employing, utilize harmonic conversion power supply to produce the harmonic wave of required frequency, humorous wave transformer adopts electromagnetic induction principle that the harmonic wave that harmonic conversion power supply exports is boosted to required magnitude of voltage; The signal that power frequency supply exports boosts by Industrial Frequency Transformer, after the signal that described Industrial Frequency Transformer exports and the signal that harmonic wave step-up transformer exports export respectively by power frequency passage and harmonic wave passage, be loaded on test product simultaneously, utilize power compensating device to carry out power back-off to the capacity of test product, measurement mechanism collection is loaded into the signal on test product; The signal of the signal that power control system foundation harmonic conversion power supply and power frequency supply export and measurement mechanism collection controls harmonic conversion power supply and power frequency supply, obtains the harmonic signal needed for test product;
Described power control system control procedure is as follows:
First, power control system is utilized to carry out self-control to harmonic conversion power supply and power frequency supply;
1) power control system is gathered the output voltage of harmonic conversion power supply, the harmonic conversion power output signal of current signal and harmonic wave each harmonic content and setting compares, if difference has between the two exceeded the first permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the first permissible error scope;
2) power frequency supply of the output voltage and current signal and setting that power control system are gathered power frequency supply outputs signal and compares, if difference has between the two exceeded the 3rd permissible error scope of setting, then power control system controls power frequency variable-frequency power sources, until difference is between the two no more than the 3rd permissible error scope;
Then, according to measuring-signal, feedback regulation is carried out to harmonic conversion power supply;
By measurement mechanism collection be loaded into the signal on test product and the setting signal needed for test product compares, if difference has between the two exceeded the second permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the second permissible error scope, realize the Automatic Control of high-power Harmonic Current characteristic test method, the power supply signal of various needs is provided.
Harmonic conversion power input voltage exchanges 380V, export as 50Hz ~ 2500Hz harmonic voltage, maximum harmonic current can more than 2500A, and harmonic wave take 50Hz as step-by-step adjustment, once support the harmonic superposition of 12 kinds of different frequencies, the size of each harmonic can regulate separately; Boosted by harmonic wave step-up transformer, arrive the magnitude of voltage of testing requirements.
Claims (9)
1. a high-power Harmonic Current characteristic test system, is characterized in that, comprises harmonic conversion power supply, humorous wave transformer, power frequency supply, Industrial Frequency Transformer, power control system and measurement mechanism;
The input end of described harmonic conversion power supply is connected with 380V alternating current, and the output terminal of described harmonic conversion power supply is connected with the input end of humorous wave transformer, and the output terminal of described humorous wave transformer is connected with test product,
The input end of described power frequency supply is connected with 380V alternating current, and the output terminal of described power frequency supply is connected with the input end of Industrial Frequency Transformer, and the output terminal of described Industrial Frequency Transformer is connected with test product;
Iron core in described humorous wave transformer is that banded non-crystalline material reels the air-gap-free iron core made;
Described Industrial Frequency Transformer exports power frequency supply by power frequency passage, and described humorous wave transformer, by harmonic wave passage output harmonic wave power supply, flows to test product after described power frequency supply and Harmonic Current superpose simultaneously;
The input end of described measurement mechanism is connected with the signal loading end of test product;
The output terminal of described harmonic conversion power supply, power frequency supply and measurement mechanism is all connected with the input end of power control system, and described harmonic conversion power supply and power frequency supply are controlled by power control system;
Described harmonic conversion power supply comprises standard harmonic source and the full bridge power amplifying circuit that multi-frequency combination and online updating parameter are supported in Frequency Adjustable amplitude modulation;
The output terminal in described standard harmonic source is connected with the input end of full bridge power amplifying circuit;
Described test product is capacitor or power reactor.
2. high-power Harmonic Current characteristic test system according to claim 1, is characterized in that, described test product and be also provided with power compensating device between humorous wave transformer and Industrial Frequency Transformer.
3. high-power Harmonic Current characteristic test system according to claim 1, is characterized in that, the multiple harmonic conversion power sources in parallel of described harmonic conversion power acquisition.
4. high-power Harmonic Current characteristic test system according to claim 3, is characterized in that, the harmonic conversion power supply of described multiple parallel connection is cabinet type connect-disconnect structure.
5. high-power Harmonic Current characteristic test system according to claim 1 and 2, it is characterized in that, described standard harmonic source is made up of the DSP of 32, ultra-large CPLD, the storer of 32, analog to digital converter, the output filter of 12, described DSP output terminal is connected with ultra-large CPLD input end, and storer and ultra-large CPLD are bi-directionally connected; Ultra-large CPLD output terminal is connected with the input end of analog to digital converter, and the output terminal of analog to digital converter is connected with output filter.
6. high-power Harmonic Current characteristic test system according to claim 5, is characterized in that, described harmonic conversion power supply also comprises the filtering circuit be connected with full bridge power amplification circuit output end.
7. high-power Harmonic Current characteristic test system according to claim 6, it is characterized in that, described full bridge power amplifying circuit forms full-bridge amplification matrix by 4 brachium pontis, and each brachium pontis is made up of an IGBT or is made up of the IGBT parallel connection of two or more same model.
8. high-power Harmonic Current characteristic test system according to claim 1, is characterized in that, described harmonic conversion power supply also comprises the protection circuit be connected with full bridge power input amplifier, and the input end of described protection circuit is connected with power circuit.
9. a high-power Harmonic Current characteristic test method, it is characterized in that, adopt the high-power Harmonic Current characteristic test system described in any one of claim 1-8, utilize harmonic conversion power supply to produce the harmonic wave of required frequency, humorous wave transformer adopts electromagnetic induction principle that the harmonic wave that harmonic conversion power supply exports is boosted to required magnitude of voltage; The signal that power frequency supply exports boosts by Industrial Frequency Transformer, after the signal that described Industrial Frequency Transformer exports and the signal that harmonic wave step-up transformer exports export respectively by power frequency passage and harmonic wave passage, be loaded on test product simultaneously, utilize power compensating device to carry out power back-off to the capacity of test product, measurement mechanism collection is loaded into the signal on test product; The signal of the signal that power control system foundation harmonic conversion power supply and power frequency supply export and measurement mechanism collection controls harmonic conversion power supply and power frequency supply, obtains the harmonic signal needed for test product;
Described power control system control procedure is as follows:
First, power control system is utilized to carry out self-control to harmonic conversion power supply and power frequency supply;
1) power control system is gathered the output voltage of harmonic conversion power supply, the harmonic conversion power output signal of current signal and harmonic wave each harmonic content and setting compares, if difference has between the two exceeded the first permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the first permissible error scope;
2) power frequency supply of the output voltage and current signal and setting that power control system are gathered power frequency supply outputs signal and compares, if difference has between the two exceeded the 3rd permissible error scope of setting, then power control system controls power frequency variable-frequency power sources, until difference is between the two no more than the 3rd permissible error scope;
Then, according to measuring-signal, feedback regulation is carried out to harmonic conversion power supply;
By measurement mechanism collection be loaded into the signal on test product and the setting signal needed for test product compares, if difference has between the two exceeded the second permissible error scope of setting, then power control system controls harmonic conversion power supply, until difference is between the two no more than the second permissible error scope, realize the Automatic Control of high-power Harmonic Current characteristic test method, the power supply signal of various needs is provided.
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| CN104316796B (en) | 2017-06-13 |
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