CN103048596A - End-to-end direct-current voltage withstand testing device and method of MMC (modular multilevel converter) valve - Google Patents
End-to-end direct-current voltage withstand testing device and method of MMC (modular multilevel converter) valve Download PDFInfo
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- CN103048596A CN103048596A CN2012105444616A CN201210544461A CN103048596A CN 103048596 A CN103048596 A CN 103048596A CN 2012105444616 A CN2012105444616 A CN 2012105444616A CN 201210544461 A CN201210544461 A CN 201210544461A CN 103048596 A CN103048596 A CN 103048596A
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Abstract
The invention relates to an end-to-end direct-current voltage withstand testing device and method of an (modular multilevel converter) valve. The testing device comprises a specimen valve, a charging power supply, a water cooling device, a local electric discharging device, a main switch, a voltage divider and a backstage controller; a water-cooling pipeline of the specimen valve is connected to the water cooling device; the backstage controller is connected with the specimen valve through optical fiber; the voltage divider is connected with the specimen valve in parallel; the main switch is respectively connected with the charging power supply and the backstage controller; the local electric discharging device is connected with the specimen valve and is used for measuring a local electric discharging valve of the specimen valve; and the charging power supply is used for supplying electric power to the testing device. The end-to-end direct-current voltage withstand testing device and method disclosed by the invention have the capabilities of guiding an insulating test to proceed smoothly and safety and ensuring safety of equipment in the test.
Description
Technical field
The present invention relates to test unit and the test method thereof of a kind of power electronics and field of power, be specifically related to DC voltage withstand test device and test method thereof between a kind of end of MMC valve.
Background technology
Flexible DC power transmission (VSC-HVDC) technology has a wide range of applications in the high-voltage dc transmission electrical domain, VSC-HVDC based on modularization multi-level converter (MMC), be to realize utilizing the IGBT valve to carry out a kind of mode of direct current transportation, its core component is called the MMC valve.
DC voltage withstand test between MMC valve end to investigate the whole withstand voltage level after inner all submodules of valve are connected, namely tests the withstand voltage level of IGBT, anti-paralleled diode, electronic circuit and other associated components.
Before test unit puts into operation, need to carry out the DC voltage withstand test of MMC valve, this is the basis of the follow-up debugging of valve and operation.The MMC valve is as comparatively complicated power electronic equipment, and its Insulation Test is compared conventional high-tension equipment and had certain singularity; The various situations that may occur in needing to consider to test are carried out the preliminary work that control is protected.
Summary of the invention
For the deficiencies in the prior art, the invention provides DC voltage withstand test device and test method thereof between a kind of end of MMC valve, instruct DC voltage withstand test between MMC valve end, and the safety of equipment in can warranty test.Test method can be investigated the whole withstand voltage level after inner all the submodule series connection of test product valve, namely test the withstand voltage level of IGBT module and other appurtenances, also investigated test product valve simultaneously in charging process between the submodule or all pressures situation between the valve module.
The objective of the invention is to adopt following technical proposals to realize:
DC voltage withstand test device between a kind of end of MMC valve, described test unit comprise test product valve, charge power supply, water-cooling apparatus, shelf depreciation instrument, main switch, voltage divider and background controller; Its improvements are, the water-cooled pipeline of test product valve is connected to water-cooling apparatus; Described background controller is connected with described test product valve by optical fiber; Described voltage divider is in parallel with test product valve; Described main switch is connected with background controller with charge power supply respectively; Described shelf depreciation instrument is connected with test product valve, is used for measuring the shelf depreciation value of test product valve; Charge power supply is described test unit power supply.
Wherein, described test product valve is composed in series by at least two submodules; Each submodule of described test product valve all is connected with the submodule controller and a high position is got the energy power supply; Each submodule includes direct current capacitors and the half-bridge structure in parallel with it; A described high position is got and can be connected in parallel on submodule direct current capacitors two ends by power supply; It can power supply be described submodule controller power supply that a high position is got.
Wherein, described test product valve comprises the water-cooled pipeline, adopts flexible pipe that the water-cooled pipeline of test product valve is connected to water-cooling apparatus, forms the loop with water-cooling apparatus.
The present invention is based on the test method of DC voltage withstand test device between the end of a kind of MMC valve that another purpose provides, its improvements are that described test method comprises the steps:
A, coolant flow coolant flow to the test product valve nominal operating conditions of regulating water-cooling apparatus guarantee that inflow temperature is less than 20 degree; The cooling medium conductivity below 0.2 μ S/cm, test product valve water-cooled pipeline ne-leakage;
B, the described background controller of affirmation can reliably be controlled the main switch divide-shut brake;
C, background controller is connected with test product valve by optical fiber, and test product valve is set is the full cut-off lock status;
D, between the test product valve end, add half trial voltage (trial voltage is generally 1.1 times of test product valve rated voltage);
E, progressively raise the test product valve terminal voltage to trial voltage, kept 5 minutes, the shelf depreciation value of in the end one minute record shelf depreciation instrument;
F, trial voltage are down to zero, withdraw from background controller, wait for after 20 minutes with high-voltage discharging rod every submodule capacitor discharge in the test product valve to 0V;
Whether G, judgement test are passed through.
Wherein, in the described steps A, with flexible pipe the water-cooled pipeline of test product valve is connected to water-cooling apparatus, the water-cooled pipeline ne-leakage of 1 hour test product valve of accumulation operation.
Wherein, among the described step D, adopt charge power supply between the test product valve end, to add half trial voltage, whether the voltage of each submodule of monitoring distributes even in alive process, whether the work of submodule controller is normal, proceeds test in the situation that voltage is evenly distributed and submodule is working properly.
Wherein, in the described step e, described trial voltage is High Level DC Voltage between the test product valve end, represents with Utds5min, determines according to the rated operational voltage of test product valve.
Wherein, among the described step G, if the water-cooled pipeline in the test product valve, submodule and submodule controller do not occur to puncture and without partial discharge phenomenon, then the expression test is passed through.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, DC voltage withstand test device between the end of MMC valve provided by the invention can instruct the smooth safety of Insulation Test to carry out, and the safety of equipment in can warranty test.Test method can be investigated the whole withstand voltage level after inner all the submodule series connection of test product valve, namely test the withstand voltage level of IGBT module and other appurtenances, also investigated test product valve simultaneously in charging process between the submodule or all pressures situation between the valve module.
2, the present invention adopts background controller to be connected with main switch, and when guaranteeing overvoltage to occur in the test product valve submodule, background controller control main switch disconnects charge power supply, protection test product valve and test unit.
Description of drawings
Fig. 1 is the schematic diagram of DC voltage withstand test device between the end of MMC valve provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The DC voltage withstand test principle of device comprises test product valve, charge power supply, water-cooling apparatus, shelf depreciation instrument, main switch, voltage divider and background controller as shown in Figure 1 between the end of MMC valve provided by the invention; Adopt flexible pipe that the water-cooled pipeline of test product valve is connected to water-cooling apparatus, form the loop with water-cooling apparatus.Background controller is connected with described test product valve by optical fiber; Voltage divider is in parallel with test product valve; Main switch is connected with background controller with charge power supply respectively; The shelf depreciation instrument is connected with test product valve, is used for measuring the shelf depreciation value of test product valve; Charge power supply is whole test unit power supply.
Test product valve is composed in series by several submodules; Each submodule of test product valve all is connected with the submodule controller and a high position is got the energy power supply; Each submodule includes direct current capacitors and the half-bridge structure in parallel with it; Half-bridge structure comprises equalizing resistance, two IGBT unit, thyristor and switches; Two IGBT units in series form the IGBT series arm; Described equalizing resistance is positioned at direct current capacitors and IGBT series arm, and is in parallel with direct current capacitors and IGBT series arm respectively; Each IGBT unit includes pipe IGBT device and diode antiparallel with it and lower pipe IGBT device and diode antiparallel with it; Switch, thyristor and I IGBT device are in parallel successively.
A high position is got and can be connected in parallel on submodule direct current capacitors two ends by power supply; It can power supply be described submodule controller power supply that a high position is got; Each submodule is short circuit and being on the different potentials not.
The present invention also provides the test method of DC voltage withstand test device between a kind of end of MMC valve, comprises the steps:
One, the test preparatory stage:
(1) water system inspection: the coolant flow of regulating water-cooling apparatus coolant flow to the test product valve nominal operating conditions guarantees that the inflow temperature of water-cooling apparatus is less than 20 degree.The cooling medium conductivity below 0.2 μ S/cm, test product valve water-cooled pipeline ne-leakage.
(2) the described background controller of affirmation can reliably be controlled the main switch divide-shut brake.
Two, experimental stage:
1. connect hookup by Fig. 1, connect the optical fiber between test product valve and the background controller, and test product valve is set is the full cut-off lock status;
2. at first between the test product valve end, add half trial voltage (trial voltage is generally 1.1 times of test product valve rated voltage), whether the voltage of noting each test product valve module of monitoring in the alive process distributes even, whether the submodule controller is working properly, after all are normal, proceeds test;
3. the terminal voltage that progressively raises is to High Level DC Voltage between trial voltage Utds_5min(test product valve end), kept 5 minutes, last minute is recorded the shelf depreciation value of shelf depreciation instrument, satisfy the requirement of test standard, investigate whether DC break down voltage intensity satisfies insulating requirements between the end of test product valve in 5 minutes.
4. trial voltage is down to zero, withdraws from background controller, waits for after 20 minutes with high-voltage discharging rod the direct current capacitors of each submodule in the test product valve is discharged to 0V, reduces test product valve voltage and returns to the front state of test.
If the water-cooled pipeline 5. in the test product valve, submodule and submodule controller do not occur to puncture and occur without partial discharge phenomenon, then the expression test is passed through.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. DC voltage withstand test device between the end of a MMC valve, described test unit comprises test product valve, charge power supply, water-cooling apparatus, shelf depreciation instrument, main switch, voltage divider and background controller; It is characterized in that, the water-cooled pipeline of test product valve is connected to water-cooling apparatus; Described background controller is connected with described test product valve by optical fiber; Described voltage divider is in parallel with test product valve; Described main switch is connected with background controller with charge power supply respectively; Described shelf depreciation instrument is connected with test product valve, is used for measuring the shelf depreciation value of test product valve; Charge power supply is described test unit power supply.
2. DC voltage withstand test device between the end of MMC valve as claimed in claim 1 is characterized in that, described test product valve is composed in series by at least two submodules; Each submodule of described test product valve all is connected with the submodule controller and a high position is got the energy power supply; Each submodule includes direct current capacitors and the half-bridge structure in parallel with it; A described high position is got and can be connected in parallel on submodule direct current capacitors two ends by power supply; It can power supply be described submodule controller power supply that a high position is got.
3. DC voltage withstand test device between the end of MMC valve as claimed in claim 2 is characterized in that, described test product valve comprises the water-cooled pipeline, adopts flexible pipe that the water-cooled pipeline of test product valve is connected to water-cooling apparatus, forms the loop with water-cooling apparatus.
4. the test method of DC voltage withstand test device between the end of a MMC valve is characterized in that, described test method comprises the steps:
A, coolant flow coolant flow to the test product valve nominal operating conditions of regulating water-cooling apparatus guarantee that inflow temperature is less than 20 degree; The cooling medium conductivity below 0.2 μ S/cm, test product valve water-cooled pipeline ne-leakage;
B, the described background controller control of affirmation main switch divide-shut brake;
C, background controller is connected with test product valve by optical fiber, and test product valve is set is the full cut-off lock status;
D, between the test product valve end, add low-voltage;
E, progressively raise the test product valve terminal voltage to trial voltage, kept 5 minutes, the shelf depreciation value of in the end one minute record shelf depreciation instrument;
F, trial voltage are down to zero, withdraw from background controller, wait for after 20 minutes with high-voltage discharging rod each submodule capacitor discharge in the test product valve to 0V;
Whether G, judgement test are passed through.
5. the test method of DC voltage withstand test device between the end of MMC valve as claimed in claim 4 is characterized in that, in the described steps A, with flexible pipe the water-cooled pipeline of test product valve is connected to water-cooling apparatus, the water-cooled pipeline ne-leakage of 1 hour test product valve of accumulation operation.
6. the test method of DC voltage withstand test device between the end of MMC valve as claimed in claim 4, it is characterized in that, among the described step D, adopt charge power supply between the test product valve end, to add half trial voltage, whether the voltage of each submodule of monitoring distributes even in alive process, whether the work of submodule controller is normal, proceeds test in the situation that voltage is evenly distributed and submodule is working properly.
7. the test method of DC voltage withstand test device between the end of MMC valve as claimed in claim 4, it is characterized in that in the described step e, described trial voltage is High Level DC Voltage between the test product valve end, represent with Utds_5min, determine according to the rated operational voltage of test product valve.
8. the test method of DC voltage withstand test device between the end of MMC valve as claimed in claim 4, it is characterized in that, among the described step G, if the water-cooled pipeline in the test product valve, submodule and submodule controller do not occur to puncture and without partial discharge phenomenon, then the expression test is passed through.
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| CN104280672B (en) * | 2014-10-20 | 2016-12-28 | 国家电网公司 | A kind of method and device determining the DC break down voltage test startup time |
| CN106646145A (en) * | 2016-09-18 | 2017-05-10 | 国网福建省电力有限公司 | Flexible direct current power transmission converter discharge model and discharge time fixed setting method thereof |
| CN108279378A (en) * | 2017-12-29 | 2018-07-13 | 中电普瑞电力工程有限公司 | A kind of steady state test device and method of modular multilevel converter valve |
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Cited By (5)
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| CN104280672B (en) * | 2014-10-20 | 2016-12-28 | 国家电网公司 | A kind of method and device determining the DC break down voltage test startup time |
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| CN106646145A (en) * | 2016-09-18 | 2017-05-10 | 国网福建省电力有限公司 | Flexible direct current power transmission converter discharge model and discharge time fixed setting method thereof |
| CN108279378A (en) * | 2017-12-29 | 2018-07-13 | 中电普瑞电力工程有限公司 | A kind of steady state test device and method of modular multilevel converter valve |
| CN108279378B (en) * | 2017-12-29 | 2022-03-18 | 中电普瑞电力工程有限公司 | Steady-state test device and method for modular multi-level converter valve |
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Effective date of registration: 20170524 Address after: 102200 Beijing city Changping District South Shao Zhen Nan Road No. 16 Co-patentee after: State Grid Corporation of China Patentee after: China-EPRI Electric Power Engineering Co., Ltd. Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: China-EPRI Electric Power Engineering Co., Ltd. Patentee before: State Grid Smart Grid Institute Co-patentee before: State Grid Corporation of China |
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