CN109470940B - Full-power test device and method for converter - Google Patents
Full-power test device and method for converter Download PDFInfo
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- CN109470940B CN109470940B CN201710801539.0A CN201710801539A CN109470940B CN 109470940 B CN109470940 B CN 109470940B CN 201710801539 A CN201710801539 A CN 201710801539A CN 109470940 B CN109470940 B CN 109470940B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a full-power test device of a converter, which comprises a test circuit, wherein the test circuit comprises a tested converter, an electric reactor and an accompanying converter which are sequentially connected, and the input end of the tested converter and the output end of the accompanying converter are connected with a power grid; the auxiliary converter is used for outputting adjustable output frequency and output voltage so as to adjust the output frequency and the output voltage of the converter to be tested for testing. The invention also discloses a test method based on the converter full-power test device, which is used for adjusting the output frequency and the output voltage of the converter to be tested by adjusting the output frequency and the output voltage of the converter to be tested. The converter full-power test device and the test method have the advantages of low test cost, good stability, small loss, full-frequency point test and the like.
Description
Technical Field
The invention mainly relates to the technical field of rail transit, in particular to a full-power test device and method for a current transformer.
Background
The full-power test is a necessary item of a high-power converter product type test and also a necessary way for checking design parameters and improving product quality of the high-power converter product. The existing full-power test method of the converter device mainly comprises a reactor type reactive load method, a resistance type energy consumption load method and a motor to drag energy feed load method. The reactor type reactive load cannot check the phase-shifting transformer; the resistance-type energy consumption load mainly consumes load energy in a heat energy mode, is not economical enough, and has high requirements on the cost, the field and the like of heat dissipation equipment; the motor has comprehensive test capability on the dragging energy feed load, is a common test method for medium and small power levels, but needs to continuously increase motors and energy feed frequency converters with higher power levels along with the increase of the power level of the frequency converter, has high investment cost and large floor area, and is not suitable for long-term development of application industry in the high-power direction; the direct feedback input power grid method effectively solves the problems of insufficient power grid capacity, high test investment cost, large test loss and the like, but has the problems of insufficient direct-current voltage output capacity of the converter and fixed test output frequency of the converter. The various power test methods are described in detail below:
(1) reactor type reactive load method
Because the device mainly outputs no-power current, only the output power element of the converter can be checked, and the input element, the input transformer and the like can not be checked, and meanwhile, the output power factor of the device under the condition of simulating load can not be adjusted and checked due to input reactive power.
(2) Resistance type energy consumption load method
The method can be used for comprehensively examining the converter to be tested, but the power loss is very large, all loads are consumed by heat energy, the test cost is high, the heat dissipation capacity is very large, and the requirements on heat dissipation equipment, fields and the like are high.
(3) Motor opposite-dragging load method
In the method, the load of the tested frequency converter is loaded by the energy-fed frequency converter in a motor-to-drive mode, and the energy of the load is fed back to a power grid by the energy-fed frequency converter. The method has comprehensive test capability, but along with the continuous increase of the power grade of the frequency converter, a motor with higher power grade and an energy feed frequency converter need to be continuously increased, so that the investment cost is high, and the occupied area is large.
(4) Direct feedback input method for power grid
The patent: CN200910011321.0 full load current transformation test method for micro power consumption converter proposes a test method, in which the output of the converter is directly connected to the input end power grid of the frequency converter through the reactor, the output power of the frequency converter is controlled to be directly fed back to the input end power grid, and the preceding power grid only provides test loss, as shown in fig. 4, the scheme effectively solves the problems of insufficient power grid capacity, high test investment cost, large test loss, and the like. However, there are the following problems:
1. due to the design characteristics, cost and other factors of the converter, the voltage on the direct current side of the frequency converter cannot have too much margin, so that the frequency converter cannot output voltage higher than the input power grid particularly under the full-power condition, even if the output voltage of the frequency converter can barely reach the input voltage, the stability of the frequency converter in the test process cannot be achieved due to the fact that no more margin exists, the impact resistance of the frequency converter on the power grid during the test cannot be met, and the like.
2. Because the frequency of the power grid is fixed, the output frequency of all the converters in the whole test process can only be fixed as the frequency of the power grid, and the full-load test of each frequency point of the frequency converter device cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a converter full-power test device and a converter full-power test method which are simple in structure, stable in test process and capable of achieving full-load test of a full-frequency point.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a full-power test device for a converter comprises a test circuit, wherein the test circuit comprises a tested converter, a reactor and an accompanying converter which are sequentially connected, and the input end of the tested converter and the output end of the accompanying converter are connected with a power grid; the auxiliary converter is used for outputting adjustable output frequency and output voltage so as to adjust the output frequency and the output voltage of the converter to be tested for testing.
As a further improvement of the above technical solution:
the tested converter is a single-phase converter or a multi-phase converter.
The invention also discloses a test method based on the converter full-power test device, which is used for adjusting the output frequency and the output voltage of the converter to be tested by adjusting the output frequency and the output voltage of the converter to be tested.
As a further improvement of the above technical solution:
and the output fundamental frequency of the auxiliary converter is the same as the power grid fundamental frequency.
And the phase angle of the output current fundamental wave of the auxiliary converter is the same as that of the power grid.
And adjusting the output power of the tested converter, including active power and reactive power, so as to test the power and the power factor.
Compared with the prior art, the invention has the advantages that:
according to the converter full-power test device and the test method, the output voltage of the converter to be tested is fed back to the same power grid through the converter to be tested, the power grid only provides part of test loss power, the purpose that a small power grid realizes a high-power converter full-power test can be achieved, the problem of insufficient direct-current output capacity of the converter is solved, and the stability of the test process is ensured; in addition, the converter under test outputs adjustable output frequency and output voltage to adjust the output frequency and output voltage of the converter under test for testing, so that full-load test of each frequency point of the converter under test is realized, and the converter under test has a simple structure and low cost.
Drawings
Fig. 1 is a schematic structural diagram of a reactive load testing apparatus in the prior art.
Fig. 2 is a schematic structural diagram of a resistance-type energy consumption load testing apparatus in the prior art.
Fig. 3 is a schematic structural diagram of a motor drag load test device in the prior art.
Fig. 4 is a schematic structural diagram of a direct feedback power grid test device in the prior art.
FIG. 5 is a schematic structural view of the testing apparatus of the present invention.
FIG. 6 is a schematic structural diagram of the testing device of the present invention in a specific application.
Fig. 7 is a block diagram of the power regulation of the frequency converter under test in the present invention.
FIG. 8 is a block diagram of the output voltage and frequency adjustment of the test-accompanying inverter of the present invention.
The reference numbers in the figures denote: 1. a power grid; 2. a tested converter; 3. a reactor; 4. and (5) testing the converter.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 5 to 8, the converter full-power test device of the embodiment includes a test circuit, the test circuit includes a tested converter 2, a reactor 3, and an auxiliary converter 4 (components such as a switch are not shown in the figures) which are connected in sequence, and an input end of the tested converter 2 and an output end of the auxiliary converter 4 are both connected to a power grid 1; the converter under test 4 is used for outputting adjustable output frequency and output voltage so as to adjust the output frequency and the output voltage of the converter under test 2 for testing. According to the converter full-power test device, the output voltage of the converter 2 to be tested is fed back to the same power grid 1 through the converter 2 to be tested, the power grid 1 only provides part of test loss power, the purpose that the high-power converter full-power test is realized by a small power grid 1 can be achieved, the problem of insufficient direct-current output capacity of the converter is solved, and the stability of the test process is ensured; in addition, the converter under test 4 outputs adjustable output frequency and output voltage to adjust the output frequency and output voltage of the converter under test 2 for testing, so that the full-load test of each frequency point of the converter under test 2 is realized, and the converter under test has the advantages of simple structure and low cost.
In this embodiment, the converter 2 to be tested may be a high-voltage inverter, or may be another high-voltage and low-voltage converter, and the voltage class, the main circuit topology, the device model, the power class, and the input and output phase number (which may be a single-phase converter, or a three-phase or multi-phase converter) of the converter are all not limited.
The invention also correspondingly discloses a test method based on the converter full-power test device, which adjusts the output frequency and the output voltage of the converter 2 to be tested by adjusting the output frequency and the output voltage of the converter 4 to be tested. The output frequency and the output voltage corresponding to the check point of the tested converter 2 can be adjusted at will so as to completely simulate the real and changeable load condition.
In the embodiment, the output fundamental frequency of the converter 4 under test is the same as the fundamental frequency of the power grid 1; the phase angle of the output current fundamental wave of the test-assistant converter 4 is the same as that of the power grid 1.
In this embodiment, the output power of the converter 2 to be tested, including the active power and the reactive power, is adjusted to perform the power and power factor test.
The test method of the present invention is further illustrated below with reference to a specific example:
the tested converter 2 is a 10kV unit cascade high-voltage frequency converter, the accompanying converter 4 is a 10kV accompanying high-voltage energy feedback type frequency converter, and the specific test method comprises the following steps:
(1) when the test is started, the tested frequency converter and the accompanying frequency converter are both in high-voltage standby;
(2) starting an accompanying frequency converter to output a certain frequency f1 and a certain voltage U1; the frequency f1 can be the rated frequency of the tested frequency converter or other check point frequencies; the voltage U1 can be the rated voltage of the tested frequency converter or other check point voltages;
(3) starting the tested frequency converter, and adjusting the output power of the tested frequency converter, including active power and reactive power, so as to meet the assessment requirements of the power and power factor of the tested frequency converter (that is, the output and input power of the tested frequency converter and the power factor are achieved by adjusting the tested frequency converter), the specific active power and reactive power adjustment control method is a conventional method, and a specific block diagram is shown in fig. 7, wherein V isa、Vb、VcFor the output side phase voltage of the frequency converter under test, ia、ib、icOutputting side phase current for the tested frequency converter; p, Q outputting active power and reactive power for the tested frequency converter; theta is the phase angle of the voltage at the output side of the tested frequency converter, P*、Q*Outputting given instructions of active power and reactive power for the tested frequency converter;
(4) the output frequency and the output of the accompanying frequency converter can be adjusted in the test processOutputting voltage to achieve the purpose of adjusting the output frequency and the output voltage of the tested frequency converter (namely the output frequency and the output voltage of the tested frequency converter are realized by adjusting the output frequency and the output voltage of the frequency converter under test); the specific voltage and frequency regulation control method is a conventional method, and the specific structural block diagram is shown in FIG. 8, wherein f*、U*Outputting given instructions of frequency and voltage for the tested frequency converter;
(5) and (3) performing long-time assessment at a certain examination point (one or more of power, power factor, voltage, current and frequency are stable, specifically aiming at the test purpose), recording related test data, and completing related tests.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (5)
1. The converter full-power test device is characterized by comprising a test circuit, wherein the test circuit comprises a tested converter (2), a reactor (3) and an accompanying converter (4) which are sequentially connected, and the input end of the tested converter (2) and the output end of the accompanying converter (4) are connected with a power grid (1); the auxiliary converter (4) is used for outputting adjustable output frequency and output voltage so as to adjust the output frequency and the output voltage of the converter to be tested (2) to carry out a test;
the tested converter (2) is a single-phase converter or a multi-phase converter.
2. The testing method of the converter full-power testing device based on the claim 1 is characterized in that the testing is carried out by adjusting the output frequency and the output voltage of the converter under test (2) by adjusting the output frequency and the output voltage of the converter under test (4).
3. Test method according to claim 2, characterized in that the output fundamental frequency of the test-accompanying converter (4) is the same as the grid (1) fundamental frequency.
4. Test method according to claim 2, characterized in that the phase angle of the output current fundamental wave of the test-accompanying converter (4) is the same as the phase angle of the power grid (1).
5. Test method according to claim 2, characterized in that the output power of the converter under test (2), including active power and reactive power, is regulated to perform the power and power factor tests.
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| CN110286273B (en) * | 2019-05-16 | 2021-07-30 | 中国科学院合肥物质科学研究院 | Test circuit and method for voltage response test under rated current of thyristor converter |
| CN110286316B (en) * | 2019-07-02 | 2022-02-01 | 中车大连机车研究所有限公司 | Pure inductance drag-based power module full-power test method and system |
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| CN201444190U (en) * | 2009-04-25 | 2010-04-28 | 荣信电力电子股份有限公司 | Micro-power full-load test device for current transformer |
| US9121913B2 (en) * | 2011-03-21 | 2015-09-01 | Deere & Company | System for detecting a failure associated with an inverter or associated machine |
| CN202815112U (en) * | 2012-09-10 | 2013-03-20 | 株洲中达特科电子科技有限公司 | Frequency converter test system |
| CN203444031U (en) * | 2013-08-01 | 2014-02-19 | 株洲变流技术国家工程研究中心有限公司 | Modularized multi-level current transformer tester |
| CN103616584B (en) * | 2013-11-15 | 2016-03-02 | 远景能源（江苏）有限公司 | The adjustment method of a kind of frequency converter test platform and frequency converter test platform |
| US9562950B2 (en) * | 2014-04-24 | 2017-02-07 | General Electric Company | Automated method and apparatus for testing a crowbar circuit of a power converter |
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