CN101937058B - Device and method for testing multi-wave fault current testing device in converter valve operating test - Google Patents
Device and method for testing multi-wave fault current testing device in converter valve operating test Download PDFInfo
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- CN101937058B CN101937058B CN 201010266491 CN201010266491A CN101937058B CN 101937058 B CN101937058 B CN 101937058B CN 201010266491 CN201010266491 CN 201010266491 CN 201010266491 A CN201010266491 A CN 201010266491A CN 101937058 B CN101937058 B CN 101937058B
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Abstract
The invention discloses a device and a method for testing a multi-wave fault current testing device in a converter valve operating test. The device comprises a generator return circuit, wherein the generator return circuit consists of a short circuit generator, a breaker, a reactor, a resistor and a primary side of a step-up transformer which are connected in series; a secondary side of the step-up transformer is connected with a wave-modulated branch and a converter valve to be tested in parallel respectively, and the wave-modulated branch consists of the breaker, a wave-modulated capacitor and a wave-modulated resistor which are connected in series; the low potential of the secondary side of the step-up transformer is earthed; and the converter valve to be tested is also connected with a current source and a voltage source, and the converter valve to be tested is connected with the output ends of the current source and the voltage source respectively to form the return circuit. The testing device has the advantages of accurately testing the test waveforms of the converter valve and providing reliable test data for the improvement of the performance of the converter valve along with simple structure and easy realization. In addition, the device and the method are applied to various tests of the converter valve connected with high-power thyristors in series, and provide powerful guarantee for the independent research and development of the converter valve.
Description
Technical field
The invention belongs to the high voltage dc transmission thyristor valve technical field of power transmission system, relate to a kind of fault current testing method, the many ripples of especially a kind of high voltage dc transmission thyristor valve performance test time fault current testing method.
Background technology
Needs along with power system development, the high voltage direct current transmission project development of China is very fast, the core of DC transmission engineering current conversion station is exactly the converter valve by the series connection of high-power thyristor device, the quality of this equipment directly influences the reliability of power transmission and transformation system, and its cost generally accounts for about 25% of total investment of engineering.Converter valve equipment need be realized production domesticization, and possessing research technique is the important assurance of independent research.
The converter valve operating test loop is used to examine the runnability of converter valve under bad working environments, the technology more complicated, and it is equivalent to the function of a current conversion station, and is also more special than current conversion station in some aspects.The converter valve operating test project mainly comprises periodic triggers, turn-offs the fault current test two large divisions of test and valve, and wherein the test of the fault current of valve is divided into time fault current test of many ripples and many ripples time two pilot projects of fault current test.When the DC converter station operating condition, the situation that flashover or valve group take place insulation breakdown owing to converter valve thyristor loses blocking ability might take place, though these phenomenons seldom take place, but can be very serious in case consequence occurs, valve fault current pilot project is reproduced a brachium pontis exactly and is short-circuited suddenly after the fault, and electric current is through the converter valve one-period short trouble situation of conducting or three not conductings of cycle again.
Summary of the invention
The objective of the invention is to detect direct current transportation and whether reach the GB requirement with the performance of converter valve by this test, the many ripples of a kind of converter valve operating test time fault current test unit and test method are provided, the present invention adopts impact short-circuit generator system that Test to Failure electric current and recovery voltage are provided, thereby makes it can realize the purpose of many ripples time valve fault current test.
The objective of the invention is to solve by the following technical programs:
The many ripples of this converter valve operating test time fault current test unit comprises the generator loop, and described generator loop is connected in series successively by the former limit of short-circuit generator, isolating switch, reactor, resistance and step-up transformer and forms; The secondary of described step-up transformer is parallel with harmonic branch road and tested converter valve respectively, and described harmonic props up route isolating switch, harmonic electric capacity and wave regulating resistor serial connection and constitutes; The cold end ground connection of described step-up transformer secondary; Described tested converter valve also is connected with current source and voltage source, and tested converter valve is connected to form the loop with the output terminal of described current source and voltage source respectively.
Also be connected with isolating switch between the hot end of above-mentioned harmonic branch road and tested converter valve.
Based on above device, the present invention also proposes a kind of test method, specifically may further comprise the steps:
1) capacitance and the resistance value of at first regulating the harmonic branch road by reverse recovery voltage parameter request in time test of many ripples;
2) simultaneously trigger voltage source and current source then are applied on the tested converter valve output of voltage source and current source, and it is carried out preheating;
3) restart short-circuit generator, make first breaker closing, the short-circuit generator parameter of adjusting;
4) to tested converter valve preheating 10 minutes, short-circuit generator begins excitation and boosts in the time of the 7th minute;
5) when preheating in the 10th minute end, and behind the short-circuit generator output voltage stabilization, voltage source and current source are suddenly stopped, this moment, tested converter valve was in blocking state;
6) make tested converter valve conducting at voltage over zero, produce short-circuit current;
7) cycle of tested converter valve conducting 17.8ms, the generator loop provides the reverse recovery voltage of tested converter valve 2.2ms duration, continuing the tested converter valve of conducting then behind first voltage over zero 20ms makes it operate in short-circuit condition, the same, behind the tested converter valve 10ms of conducting for the third time, the action of the 3rd isolating switch, the short-circuit current that cutting-off of short-circuit generator provides, tested converter valve is out of service behind the short-circuit current of three cycles of experience.
8) if test waveform does not reach standard-required, need readjust loop parameter and test until test waveform by above step and reach standard, finish test.
Further, in the above step 3), the method for the short-circuit generator of adjusting (G) parameter is: according to step-up transformer (T) the no-load voltage ratio generator voltage parameter of adjusting, according to the following formula dynamo current parameter of adjusting;
I=u/(z+ωL)，
U is the short-circuit generator voltage of adjusting in the following formula, and Z is the former avris resulting impedance of step-up transformer (T), ω=50, L is the former avris total inductance of step-up transformer (T)).
The present invention has following beneficial effect:
The present invention is as the device of checking key equipment converter valve in the DC transmission system, its easy realization not only simple in structure, and can accurately detect the test waveform of converter valve, provide reliable test data for improving the converter valve performance, and the present invention is applicable to the various tests that are used for the converter valve of connecting with the high-power thyristor device, for the independent research of converter valve provides powerful guarantee.
Description of drawings
Fig. 1 is an electrical structure diagram of the present invention;
Fig. 2 is current source circuit figure of the present invention;
Fig. 3 is voltage source circuit figure of the present invention;
Fig. 4 is the test waveform exemplary plot of the many ripples of the present invention time fault current test.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, the many ripples of converter valve operating test of the present invention time fault current test unit comprises the generator loop, and this generator loop is connected in series successively by the former limit of short-circuit generator G, the first isolating switch K1, reactor L, resistance R 1 and step-up transformer T and forms; The secondary of step-up transformer T is parallel with harmonic branch road and tested converter valve Vt respectively, and harmonic props up route isolating switch K2, harmonic capacitor C and wave regulating resistor R2 serial connection and constitutes; The cold end ground connection of step-up transformer T secondary; Tested converter valve Vt also is connected with current source and voltage source, and tested converter valve Vt is connected to form the loop with the output terminal of current source and voltage source respectively.Between the hot end of harmonic branch road and tested converter valve Vt, also be connected with the 3rd isolating switch K3 in addition.In preferred embodiment of the present invention, the short-circuit generator that test unit adopts is the high power capacity generator of non-demarcation system, it provides the high power capacity short-circuit current (test parameters can be adjusted to some extent according to tested converter valve is different) of tested converter valve Vt 21kV, 36kA through the step-up transformer of 14kV/21kV.
Below current source and voltage source that the invention described above is related to be described in detail:
Current source
As shown in Figure 2, the current source that the present invention relates to comprises two covers, 6 pulse wave rectifier bridge branch roads, and every cover 6 pulse wave rectifier bridge branch roads comprise converter power transformer T1/T2, six pulse wave rectifier bridge B1/B2, isolation valve Va1/Va6, smoothing reactor L1/L2 and dc bus; It is online that the input end of converter power transformer T1/T2 in two covers, the 6 pulse wave rectifier bridge branch roads is connected to high voltage power distribution respectively, and the output terminal of two converter power transformer T1/T2 is connected to the input end of two six pulse wave rectifier bridge B1/B2 respectively; Two six pulse wave rectifier bridge B1/B2 output hot ends directly link to each other by dc bus, are connected to the hot end of two 6 pulse wave rectifier bridge B 1/B2 after the cold end of two 6 pulse wave rectifier bridge B1/B2 is connected with two smoothing reactor L1/L2 respectively and is compiled in a bit; Isolation valve Va1/Va6 in the described 6 pulse wave rectifier bridge branch roads of every cover with after tested converter valve Vt connects respectively as the brachium pontis of corresponding six pulse wave rectifier bridge B1/B2.
Isolation valve Va1 and the output terminal of Va6 of two covers in the 6 pulse wave rectifier bridge branch roads interconnects the back and is connected to the input end of tested converter valve Vt by dc bus, and the output terminal of tested converter valve Vt is connected to two smoothing reactor L1 and L2 and confluxes on the noble potential of the output terminal that is connected to six pulse wave rectifier bridge B1/B2 behind the node again.The converter power transformer T1/T2 that uses in this current source is a Y/Y type converter power transformer.
Voltage source
As shown in Figure 3, the voltage source that the present invention relates to comprises ULTC T3, six pulse wave rectifier bridge B, vibration capacitance group Cs, charging capacitor group C
L, commutation inductance L4, reverse charging reactor L5, charging reactor L3 and first to fourth auxiliary valve Va2 ~ Va5, the output terminal of described ULTC T3 is connected with the input end of six pulse wave rectifier bridge B, the output terminal of described six pulse wave rectifier bridge B and charging capacitor group C
LL3 is connected to form the loop with charging reactor; Described charging capacitor group C
LAlso be in turn connected to form the loop with capacitance group Cs with the described first auxiliary valve Va2, reverse charging reactor L5, vibration; The end of described the 4th auxiliary valve Va5 is connected between the first auxiliary valve Va2 and the reverse charging reactor L5, and the other end is connected in vibration capacitance group Cs and charging capacitor group C
LBetween; Described vibration also connects and composes the loop with the second auxiliary valve Va3, commutation inductance L4 and tested converter valve Vt successively with capacitance group Cs; The described second auxiliary valve Va3 also connects and composes the loop with the 3rd auxiliary valve Va4.This voltage source all is parallel with the passband high-voltage sensor at tested converter valve, charging capacitor in addition, is provided with two digital negative feedback control loops between described passband high-voltage sensor and six pulse wave rectifier bridge B.
Based on the many ripples of above-described converter valve operating test time fault current test unit, the present invention proposes the many ripples of a kind of converter valve operating test time fault current testing method, specifically may further comprise the steps:
1) capacitance and the resistance value of at first regulating the harmonic branch road by reverse recovery voltage parameter request in time test of many ripples;
2) simultaneously trigger voltage source and current source then are applied on the tested converter valve Vt output of voltage source and current source, and it is carried out preheating;
3) restart short-circuit generator G, make the first isolating switch K1 close a floodgate the short-circuit generator G parameter of adjusting;
The adjust method of short-circuit generator G parameter of the present invention is: according to the step-up transformer T no-load voltage ratio generator voltage parameter of adjusting, according to the following formula dynamo current parameter of adjusting;
I=u/(z+ωL)，
U is the short-circuit generator voltage of adjusting in the following formula, and Z is the former avris resulting impedance of step-up transformer T, ω=50, and L is the former avris total inductance of step-up transformer T;
4) to tested converter valve Vt preheating 10 minutes, short-circuit generator G begins excitation and boosts in the time of the 7th minute;
5) when preheating in the 10th minute end, and behind the short-circuit generator G output voltage stabilization, voltage source and current source are suddenly stopped, this moment, tested converter valve Vt was in blocking state;
6) make tested converter valve Vt conducting at voltage over zero, produce short-circuit current;
7) cycle of tested converter valve Vt conducting 17.8ms (adjustable) according to this parameter of the tested converter valve of difference, the generator loop provides the reverse recovery voltage of tested converter valve Vt 2.2ms duration, continuing the tested converter valve Vt of conducting then behind first voltage over zero 20ms makes it operate in short-circuit condition, the same, behind the tested converter valve Vt 10ms of conducting for the third time, the 3rd isolating switch K3 action, the short-circuit current that cutting-off of short-circuit generator provides, tested converter valve Vt is out of service behind the short-circuit current of three cycles of experience.
8) the record test waveform as shown in Figure 4, write down electric current and voltage oscillogram in time on the tested converter valve Vt respectively, if test waveform do not reach standard-required, need readjust loop parameter and test until test waveform by above step and reach standard, finish test.
In sum, test method of the present invention is in each power frequency period, adopts voltage source to provide dc high voltage, current source that D.C. high-current is provided, and the load that acts on the thyristor valve during model engineering operation carries out 10 minutes by a definite date valve group preheating.Preheating finishes first three minute generator system observing and controlling chamber control short-circuit generator excitation and boosts; boost voltage source, current source emergency stop when issuing synthesis loop current source " short circuit permission signal " (under the 14kV short-circuit generator hold pressure can not be) preheating end after stable above 3 minutes, the pulse of 20ms inner sealing current source.Carry out test by the generator loop then to tested converter valve.Obtain test waveform figure at last as the tested converter valve of Fig. 4.
Claims (2)
1. test method based on the many ripples of converter valve operating test time fault current test unit, test unit comprises the generator loop, and described generator loop is connected in series successively by the former limit of short-circuit generator (G), first isolating switch (K1), reactor (L), resistance (R1) and step-up transformer (T) and forms; The secondary of described step-up transformer (T) is parallel with harmonic branch road and tested converter valve (Vt) respectively, and described harmonic props up route isolating switch (K2), harmonic electric capacity (C) and wave regulating resistor (R2) serial connection and constitutes; The cold end ground connection of described step-up transformer (T) secondary; Described tested converter valve (Vt) also is connected with current source and voltage source, and tested converter valve (Vt) is connected to form the loop with the output terminal of described current source and voltage source respectively;
It is characterized in that, may further comprise the steps:
1) capacitance and the resistance value of at first regulating the harmonic branch road by reverse recovery voltage parameter request in time test of many ripples;
2) simultaneously trigger voltage source and current source then are applied on the tested converter valve (Vt) output of voltage source and current source, and it is carried out preheating;
3) restart short-circuit generator (G), make first isolating switch (K1) close a floodgate the short-circuit generator of adjusting (G) parameter;
4) to tested converter valve (Vt) preheating 10 minutes, short-circuit generator (G) beginning excitation is boosted in the time of the 7th minute;
5) when preheating in the 10th minute end, and behind short-circuit generator (G) output voltage stabilization, voltage source and current source are suddenly stopped, tested converter valve this moment (Vt) is in blocking state;
6) make tested converter valve (Vt) conducting at voltage over zero, produce short-circuit current;
7) cycle of tested converter valve (Vt) conducting 17.8ms, the generator loop provides tested converter valve (Vt) 2.2ms the reverse recovery voltage of duration, continuing the tested converter valve of conducting (Vt) then behind first voltage over zero 20ms makes it operate in short-circuit condition, the same, behind the tested converter valve of conducting for the third time (Vt) 10ms, the 3rd isolating switch (K3) action, the cutting-off of short-circuit is sent out
The short-circuit current that motor provides, tested converter valve (Vt) is out of service behind the short-circuit current of three cycles of experience;
8) if test waveform does not reach standard-required, need readjust loop parameter and test until test waveform by above step and reach standard, finish test.
2. test method according to claim 1 is characterized in that, in the step 3), the method for the short-circuit generator of adjusting (G) parameter is: according to step-up transformer (T) the no-load voltage ratio generator voltage parameter of adjusting, according to the following formula dynamo current parameter of adjusting;
I=u/(z+ωL)，
U is the short-circuit generator voltage of adjusting in the following formula, and Z is the former avris resulting impedance of step-up transformer (T), ω=50, and L is the former avris total inductance of step-up transformer (T).
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| CN102353897B (en) * | 2011-06-22 | 2014-07-02 | 中国西电电气股份有限公司 | Extra-high voltage converter valve interrupting current test loop and test method thereof |
| CN103809114B (en) * | 2014-01-21 | 2017-01-04 | 清华大学 | The power of a kind of modularization multi-level converter converter valve liquidates assay device |
| CN105021984B (en) * | 2015-07-15 | 2018-01-19 | 南京南瑞继保电气有限公司 | DC converter valve fault current experimental rig and its test method |
| CN105629032A (en) * | 2015-12-28 | 2016-06-01 | 中国西电电气股份有限公司 | Valve control signal time sequence test loop in converter valve short circuit current fault working condition |
| CN110073229B (en) * | 2016-12-15 | 2021-04-09 | 东芝能源系统株式会社 | Test device of direct current breaker |
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| DE3303136A1 (en) * | 1982-03-19 | 1983-09-22 | BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau | Synthetic test circuit for high-voltage circuit breakers |
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Address after: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an Patentee after: Xi'an High Voltage Electrical Apparatus Research Institute Co.,Ltd. Address before: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an Patentee before: XI'AN HIGH VOLTAGE APPARATUS RESEARCH INSTITUTE Co.,Ltd. |
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