CN104034984B - Short-circuit test method for engineering valve assembly in running test for flexible direct current transmission - Google Patents
Short-circuit test method for engineering valve assembly in running test for flexible direct current transmission Download PDFInfo
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- CN104034984B CN104034984B CN201410280097.6A CN201410280097A CN104034984B CN 104034984 B CN104034984 B CN 104034984B CN 201410280097 A CN201410280097 A CN 201410280097A CN 104034984 B CN104034984 B CN 104034984B
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Abstract
The invention discloses a short-circuit test method for an engineering valve assembly in a running test for flexible direct current transmission. A short-circuit test for a flexible direct-current engineering valve assembly is carried out by virtue of a back-to-back loop test system for flexible direct current transmission; the back-to-back loop test system for flexible direct current transmission is composed of a current converter station A and a current converter station B; the current converter station A is a rectification station, the current converter station B is an inversion station, and a direct-current bus is connected between the two current converter stations; an electronic switch L used for controlling the short-circuit time of the direct-current bus is installed on the direct-current bus; a positive pole and a negative pole are short-circuit by controlling the on-off of the short-circuit electronic switch L; the short-circuit current value between the positive pole and the negative pole, that is, a direct-current side, and the short-circuit current value of a bridge arm current are detected; each peak current and a short-circuit current duration time are measured. According to the short-circuit test method, the problem that the test object MMC valve of the short-circuit current test for flexible direct current transmission is difficult to complete the test due to high voltage class, high current and high capacity is solved.
Description
Technical field
The invention belongs to flexible DC power transmission test field, it is related to a kind of short-circuit test side of flexible direct-current transmission field
Method, the short-circuit test method of engineering valve module in more particularly, to a kind of flexible DC power transmission operation test.
Background technology
Start to be applied to direct current with high-power high voltage insulated gate bipolar transistor (IGBT) valve technology device can be turned off
Transmission of electricity, indicates the birth of third generation HVDC Transmission Technology.This technology is suitable for low capacity transmission of electricity, is also suitable for Large Copacity
Transmission of electricity.With the increase of flexible DC power transmission engineering in world wide, China is in progress also very in terms of flexible DC power transmission engineering
Hurry up, but flexible DC power transmission (MMC-HVDC) the technology development time based on modularization multi-level converter is short, in Practical Project
The feature that middle generally existing voltage is high, electric current is big, capacity is big；So the operation type that MMC valve is carried out before putting into operation certainly will be influenced whether
Formula is tested, and is difficult to simulation and actual operating mode identical equivalent full capacity test loop in experimental enviroment at present.
Conventional similar test method is generally individually to adopt synthesis loop, is led to using generating set or capacitor bank
Cross the simulation that short circuit current to be realized by peripheral circuit to the test method of test product injection high current, but because flexible DC power transmission is short
The features such as electric pressure of road current testing tested test product MMC valve is high, electric current is big, capacity is big has been difficult to return in traditional synthesis
To complete on road, to be badly in need of a kind of test method adapting to the test of flexible DC power transmission short circuit current at present.
Content of the invention
The purpose of the present invention is the shortcoming overcoming above-mentioned prior art, provides one kind can meet high voltage, high current, great Rong
The short-circuit test method of engineering valve module in the flexible DC power transmission operation test of amount demand.
The present invention seeks to be achieved through the following technical solutions：
A kind of short-circuit test method of engineering valve module in flexible DC power transmission operation test, using the flexible DC power transmission back of the body
Backrest loop test system carries out the short circuit current test of soft straight engineering valve module, described flexible DC power transmission back-to-back loop examination
Check system is made up of inverter A station and inverter B station, and inverter A stands as converting plant, and inverter B stands as Inverter Station, two changes of current
It is connected with high-tension bus-bar after device station difference connection transformer and primary cut-out Q0, connect dc bus between two current conversion stations, directly
On stream bus, short-circuit electrical switch L is installed；Test product valve module is included in a converter station of back-to-back loop test system
In, adjusted by the switch off time and fictitious load controlling dc-side short-circuit electrical switch L and control by test product valve module
Short-circuit current value, realize the short-circuit test of engineering valve module.
Two described converter stations are made up of 24 valve modules altogether, and a valve module is made up of 2 power models, each
By in series after 2 diodes of 2 IGBT parallel connected in reverse phase, wherein half valve module is as accompanying examination valve section, another for power model
Valve module carries out short circuit current test as tested valve section, and short-circuit test specifically includes following steps：
Step 1, by being passed through deionized water to inverter and heating, make the junction temperature of inverter IGBT reach maximum；
Step 2, startup inverter, and reach 1.1 times of rated values of normal operating current, continuous service 10min, make
The operating mode of two converter station IGBT reaches thermal balance；
Step 3, by controlling short-circuit electrical switch L break-make, make positive and negative intereelectrode short-circuit, that is, short-circuit electrical switch L open,
Bypass IGCT action in inverter and lasting 100ms；
I.e. DC side and bridge arm current short-circuit current value between step 4, detection positive and negative electrode, measure each peak point current and short
Road current duration.
Described back-to-back loop test system, two converter stations are sequentially connected connection transformer, primary cut-out respectively
It is connected with high-tension bus-bar after Q0 and high-tension switch cabinet, when short-circuit electrical switch L opens, high-tension switch cabinet trips to complete disjunction shape
State.
Traditional DC current transmission valve is carried out all on synthesis loop with the test of flexible direct current transmission converter valve short circuit current,
Using generating set or capacitor bank, short circuit current is realized by the test method that peripheral circuit injects high current to test product
Simulation；But the spy such as the electric pressure that flexible DC power transmission short circuit current tests tested test product MMC valve is high, electric current is big, capacity is big
Point has been difficult to complete on traditional synthesis loop, and the present invention is based on flexible DC power transmission back-to-back loop test system
Feature, can be caused with reasons such as the system failure that fully equivalent MMC valve occurs in actual operating mode, DC side earth faults
Short trouble, test product valve module is included in a current conversion station of back-to-back three-phase modular multilevel inverter, MMC changes
Stream device DC side is adjusted and the short-circuit current value controlling by test product valve module with short-circuit electrical switch L and fictitious load, leads to
Cross the short-circuit electrical switch L break-make of control, make positive and negative intereelectrode short-circuit, be DC side and bridge arm current short circuit electricity between detection positive and negative electrode
Flow valuve, measures each peak point current and short circuit current persistent period, realizes the short-circuit test of engineering valve module.
Brief description
Fig. 1 is the circuit theory diagrams of the present invention；
Fig. 2 is the short circuit current test waveform figure of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, illustrate the solution of the present invention：
The present invention carries out the short circuit current of soft straight engineering valve module using flexible DC power transmission back-to-back loop test system
Test, as shown in figure 1, described flexible DC power transmission back-to-back loop test system is made up of inverter A station and inverter B station,
Inverter A stands as converting plant, and inverter B stands as Inverter Station, and two converter stations connect connection transformer, primary cut-out respectively
Be connected with high-tension bus-bar after Q0 and high-tension switch cabinet, between two current conversion stations connect dc bus, dc bus is provided with for
Control the electrical switch L of dc bus short circuit duration；Two converter stations are made up of 24 valve modules altogether, and valve module is by 2
Individual power model composition, each power model is by series, test product valve module bag after 2 diodes of 2 IGBT parallel connected in reverse phase
It is contained in a converter station of back-to-back loop test system, wherein half valve module tries valve section, second half valve group as accompanying
Part carries out short circuit current test as tested valve section.
Back-to-back in loop test system, Q0 is converter valve A and converter valve B primary cut-out；R0 is current-limiting resistor,
Surge current when charging in major limitation loop；T01, T02 are transformator；L1-L6 is brachium pontis reactance, is mainly used in restriction and changes
Stream, minimizing harmonic wave；L switchs for dc bus side, and short-circuit electrical switch L controls dc-side short-circuit；Also include dc bus side to bear
Carry, DC load inductance and resistance are used for adjusting output current size.
Short-circuit test method comprises the following steps：
A, it is passed through deionized water to back-to-back MMC inverter so as to flow reaches service requirement value, heat pure water cooling system
Deionized water in system is to 52 DEG C, and keeps constant, makes the junction temperature of inverter IGBT reach maximum；
B, the back-to-back MMC inverter of startup, and reach 1.1 times of rated values of normal operating current, continuous service
10min；The operating mode of MMC inverter IGBT is made to reach thermal balance；
C, adjusted by valve control system and send break-make instruction, make positive and negative intereelectrode short-circuit, that is, short-circuit electrical switch L open,
Bypass IGCT action in MMC inverter, high-tension switch cabinet trip to complete disjunction, and continue 100ms,
It is DC side and bridge arm current short-circuit current value between D, detection positive and negative electrode, measure each peak point current and short circuit electricity
The stream persistent period.
As shown in Fig. 2 the present invention carries out soft straight engineering using flexible DC power transmission back-to-back loop test system after testing
The short circuit current test of valve module, each short circuit peak of short circuit current is no substantially decayed, and is the most light of test method of the present invention
Point, is successfully completed using flexible DC power transmission back-to-back loop test system and is applied to flexible DC power transmission engineering Converter Station Valve
Assembly short circuit current is tested；Experiment proves that, it is soft that 10kV/12.5MW flexible DC power transmission back-to-back loop test system completes
Property DC transmission engineering Converter Station Valve assembly (comprising 56 power models) short circuit current test meet run type approval test
The technical specification of project.
Claims (2)
1. in a kind of flexible DC power transmission operation test engineering valve module short-circuit test method it is characterised in that：Using flexibility
Direct current transportation back-to-back loop test system carries out the short circuit current test of soft straight engineering valve module, the described flexible DC power transmission back of the body
Backrest loop test system is made up of inverter A station and inverter B station, and inverter A stands as converting plant, and inverter B stands as inversion
Stand, be connected with high-tension bus-bar after two converter station difference connection transformers and primary cut-out Q0, connect between two current conversion stations
Dc bus, dc bus is provided with short-circuit electrical switch L；Test product valve module is included in the one of back-to-back loop test system
In individual converter station, adjust and pass through with control by the switch off time and fictitious load controlling dc-side short-circuit electrical switch L
The short-circuit current value of test product valve module, realizes the short-circuit test of engineering valve module；
Two described converter stations are made up of 24 valve modules altogether, and a valve module is made up of 2 power models, each power
By in series after 2 diodes of 2 IGBT parallel connected in reverse phase, wherein half valve module is as accompanying examination valve section, another valve group for module
Part carries out short circuit current test as tested valve section, and short-circuit test specifically includes following steps：
Step 1, by being passed through deionized water to inverter and heating, make the junction temperature of inverter IGBT reach maximum；
Step 2, startup inverter, and reach 1.1 times of rated values of normal operating current, continuous service 10min, make two
The operating mode of converter station IGBT reaches thermal balance；
Step 3, by controlling short-circuit electrical switch L break-make, make positive and negative intereelectrode short-circuit, that is, short-circuit electrical switch L open, the change of current
Bypass IGCT action in device and lasting 100ms；
It is DC side and bridge arm current short-circuit current value between step 4, detection positive and negative electrode, measure each peak point current and short circuit electricity
The stream persistent period.
2. engineering valve module according to claim 1 short-circuit test method it is characterised in that：Described back-to-back loop examination
Check system, two converter stations be sequentially connected respectively after connection transformer, primary cut-out Q0 and high-tension switch cabinet with high-tension electricity
Line connects, and when short-circuit electrical switch L opens, high-tension switch cabinet trips to complete disjunction state.
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Cited By (1)
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| CN107728035A (en) * | 2017-10-26 | 2018-02-23 | 厦门科华恒盛股份有限公司 | The detection method and three phase mains of transistors breakdown in a kind of three phase mains |
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| CN105137212B (en) * | 2015-06-11 | 2016-08-24 | 中国西电电气股份有限公司 | A kind of high-speed power electrical switch realizes the method for short-circuit test between converter valve polar curve |
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| JP2841345B2 (en) * | 1990-03-05 | 1998-12-24 | マルコン電子株式会社 | DC voltage application test circuit for capacitors |
| JP5872184B2 (en) * | 2011-04-21 | 2016-03-01 | 株式会社東芝 | Lightning resistance test apparatus and test method |
| CN102323546B (en) * | 2011-08-25 | 2014-05-07 | 中国电力科学研究院 | Back-to-back test method of VSC-HVDC MMC valve stable state operation test |
| CN103033701B (en) * | 2012-11-30 | 2017-11-07 | 许继电气股份有限公司 | The high-power operating test device of flexible direct current transmission converter valve stable state and test method |
| CN103051174B (en) * | 2012-12-07 | 2015-01-07 | 国网智能电网研究院 | High position energy-taking power supply device of submodule of MMC valve and realizing method thereof |
| CN103064016B (en) * | 2012-12-11 | 2015-05-06 | 国家电网公司 | Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve |
| CN103066551B (en) * | 2012-12-13 | 2015-04-01 | 国网智能电网研究院 | Fault protective system for short-circuit current testing apparatus |
| CN103187722B (en) * | 2013-04-09 | 2015-12-09 | 国家电网公司 | For flexible direct current power transmission system DC side overvoltage protection and guard method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107728035A (en) * | 2017-10-26 | 2018-02-23 | 厦门科华恒盛股份有限公司 | The detection method and three phase mains of transistors breakdown in a kind of three phase mains |
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