CN103033701A - Flexible direct current transmission converter valve steady-state high-power running testing device and testing method - Google Patents
Flexible direct current transmission converter valve steady-state high-power running testing device and testing method Download PDFInfo
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- CN103033701A CN103033701A CN2012105073527A CN201210507352A CN103033701A CN 103033701 A CN103033701 A CN 103033701A CN 2012105073527 A CN2012105073527 A CN 2012105073527A CN 201210507352 A CN201210507352 A CN 201210507352A CN 103033701 A CN103033701 A CN 103033701A
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Abstract
The invention relates to a flexible direct current transmission converter valve steady-state high-power running testing device and a testing method. The testing device comprises an isolation transformer (TR1), a rectifier bridge (REC1) and a converter valve group. An alternating current input end of the rectifier bridge is connected with the isolation transformer. A direct current output end of the rectifier bridge is connected with the converter valve group. The testing device further comprises a BUCK-BOOST circuit which comprises an insulated gate bipolar translator (IGBT) module formed by an IGBT and an antiparallel diode, a resistor (R), a direct current bus support capacitor (C1) and a load electric reactor (L1). The resistor (R) and the IGBT module are connected in series and then connected with a direct current output end of rectifier bridge (REC1) in parallel. The direct current bus support capacitor (C1) is connected with two ends of a series branch circuit of the resistor (R) and the IGBT module in parallel and is connected with the converter valve group through the load electric reactor (L1). Through construction of a test platform which accords with the actual steady-state operation condition, the flexible direct current transmission converter valve steady-state high-power running testing device carries out steady-state power operation tests of a converter valve, carries out detection to current, voltage and temperature rising of components, and checks the correctness of design of the converter valve.
Description
Technical field
The present invention relates to a kind of high-power operating test device of flexible DC power transmission converter valve stable state and test method.
Background technology
Because flexible DC power transmission (VSC-HVDC) device generally has high voltage, heavy current, jumbo characteristics, causing being difficult to make up the full live road identical with actual operating mode in experimental enviroment tests, therefore, how in experimental enviroment, to make up the hookup of equivalence, carry out the test suitable with actual operating mode intensity and become the key of dealing with problems.
VSC-HVDC based on the modular multilevel converter valve, to utilize the IGBT valve to carry out a kind of new technology of direct current transportation, submodule (SM) is the minimum power unit that consists of converter valve, it is comprised of half-bridge and the Parallel-connected Capacitor that IGBT forms, several submodule series connection consist of a converter valve components, it can proportional embodiment converter valve electrical specification, be the basic electric unit that carries out the converter valve Tests at Steady State.
Usually, a VSC-HVDC converter valve engineering project comprises thousands of submodules, if all submodules are carried out the steady state power test one by one, this will be a not only engineering of time-consuming but also effort, the purpose of steady state power test is that the production technology link is tested, inspection has or not the place of element temperaturing lifting abnormality, so the high-power stable state test method of the simple flexible DC power transmission converter valve of science is particularly important, can produce in enormous quantities for the flexible DC power transmission converter valve to lay a good foundation.
Summary of the invention
The purpose of this invention is to provide a kind of high-power operating test device of flexible DC power transmission converter valve stable state and test method, carry out converter valve steady state power running test by making up the full live road identical with actual operating mode, to the detection of element current, voltage and temperature rise, the correctness of checking converter valve design.
For achieving the above object, device scheme of the present invention is: the high-power operating test device of a kind of flexible DC power transmission converter valve stable state, comprise isolating transformer (TR1), rectifier bridge (REC1) and converter valve group, the ac input end of described rectifier bridge connects isolating transformer, its dc output end connects the converter valve group, this experimental provision also comprises a BUCK-BOOST step-up/step-down circuit, this step-up/step-down circuit comprises an IGBT module that is comprised of IGBT and anti-paralleled diode, resistance (R), dc bus Support Capacitor (C1) and load reactance device (L1), resistance (R) and the dc output end that is connected in parallel on described rectifier bridge (REC1) after the IGBT module is connected, described dc bus Support Capacitor (C1) is connected in parallel on the two ends of resistance (R) and IGBT module series arm, and connects the converter valve group by load reactance device (L1).
This test unit also is provided with isolating switch input switch (KM), three-phase regulator (TY) and filter reactor (LR), described isolating switch input switch (KM) connects three-phase supply, and connects successively with three-phase regulator (TY), filter reactor (LR) and isolating transformer (TR1).
Described converter valve group is comprised of the converter valve submodule (SM) of one group of series connection, comprises the converter valve submodule and the redundant converter valve submodule that put into operation.
Described converter valve submodule is by submodule by-pass switch (K1n), two IGBT modules (T1n and T1m), thyristor (Tn), submodule electric capacity (C
SM1N) and resistance (R1n) composition, described IGBT module is comprised of an IGBT device and an antiparallel diode, described two IGBT modules (T1n and T1m) series connection, resistance (R1n) and submodule capacitor (C
SM1N) being connected in parallel on successively the two ends of two IGBT modules (T1n and T1m) series arm, by-pass switch (K1n), thyristor (Tn) are connected in parallel on the two ends of one of them IGBT module (T1m) successively.
Method scheme of the present invention is: the high-power running test method of a kind of flexible DC power transmission converter valve stable state, and step is as follows:
(1) set submodule capacitance voltage and calculate dc bus Support Capacitor voltage, closed test unit AC input killer switch (KM1), test unit begins to start;
(2) when dc bus Support Capacitor voltage reaches the magnitude of voltage that calculates, the control dc bus is through the capacitor charging of load reactance device to the converter valve submodule of each series connection, until each submodule capacitance voltage is when all reaching setting voltage value, test unit starts complete;
(3) test unit start complete after, the IGBT of each series connection converter valve submodule is sent out trigger pulse, discharged to dc bus through the load reactance device by the converter valve submodule electric capacity of each series connection.Afterwards, test unit constantly repeats converter valve submodule capacitor charge and discharge process, and circuit enters the steady-state operation state;
(4) when a converter valve submodule fault detecting in the test run process in the converter valve group, the by-pass switch of closed this fault submodule disconnects, with this fault submodule bypass, simultaneously, the by-pass switch of a redundant converter valve submodule is disconnected, it is put into operation;
(5) trigger pulse of locking converter valve submodule IGBT, output bleed-off circuit IGBT trigger pulse, the release of dc-link capacitance energy is complete, off-test; Perhaps, disconnect input killer switch (KM1), by the LC loop system capacity is discharged complete, off-test.
(6) after one group of converter valve submodule test is finished, replaceable next group converter valve submodule to be tested re-executes step (1) ~ (5).
The computing method of described dc bus Support Capacitor voltage are: U
Dc=U
cN
SM/ 2, wherein, U
DcBe dc bus Support Capacitor voltage, U
cConverter valve submodule capacitance voltage, n
SMThe converter valve submodule number that puts into operation for test.
What in the step (3) pulsed modulation of converter valve submodule is adopted is the phase shift pulse width modulation mode.
The beneficial effect that the present invention reaches: the present invention by build one with the similar test platform of actual steady state operating condition, also be provided with one group of redundant submodule in the converter valve group, when detecting operating submodule fault, can be by by-pass switch with the bypass of fault submodule, and a corresponding redundant submodule put into operation, realize the power ring steady-state behaviour test under multi-tool piece high voltage, large electric current and the steady heat strength condition, can satisfy the requirement that a plurality of submodules are tested simultaneously.
And the present invention just realizes the discharging and recharging of electric capacity observed the variation of submodule electric current and voltage by a step-up/step-down circuit, and control mode is simple, flexible operation, can well reappear the actual steady state operating condition of submodule.
Description of drawings
Fig. 1 is test unit schematic diagram of the present invention;
Fig. 2 is converter valve submodular circuits structural drawing of the present invention;
Fig. 3 is test unit capacitance voltage oscillogram of the present invention;
Fig. 4 is test unit load reactance device current waveform figure of the present invention;
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
Apparatus of the present invention embodiment:
Such as Fig. 1, test unit of the present invention comprises input killer switch KM, three-phase regulator TY, filter reactor LR, isolating transformer TR, rectifier bridge REC1, BUCK-BOOST step-up/step-down circuit and converter valve group, this converter valve group is composed in series by n+k converter valve submodule SM1 ~ SM (n+k), comprising k redundant submodule, the actual submodule number that puts into operation is n, this converter valve group is connected in parallel on the dc output end of rectifier bridge, the BUCK-BOOST step-up/step-down circuit comprises IGBT module T, the resistance R 1 of connecting with this IGBT module T, dc bus Support Capacitor C1 and load reactance device L1, dc bus Support Capacitor C1 is connected in parallel on the two ends of IGBT module T and resistance R 1 series arm, and rectifier bridge REC1 connects the converter valve group by load reactance device L1.
The converter valve submodule of this device comprises half-bridge structure and the submodule capacitor of two series connection, half-bridge structure comprises by-pass switch K1n, resistance R 1n, thyristor Tn, two IGBT module T1n and T1m, the IGBT module is comprised of an IGBT device and an antiparallel diode, IGBT module T1n and T1 series connection, resistance R 1n and submodule capacitor C
SM1NBe connected in parallel on successively the two ends of T1n and T1m series arm, by-pass switch K1n, thyristor Tn are connected in parallel on the two ends of T1m successively, each converter valve submodule is cascaded by by-pass switch separately, the by-pass switch of each the converter valve submodule that puts into operation disconnects, the by-pass switch of all the other redundant submodules is closed, when wherein certain put into operation the submodule fault time, the by-pass switch of this submodule is closed, with this submodule bypass, and the by-pass switch of a redundant submodule disconnected, it is put into operation, and the submodule number of warranty test operation is constant.
The inventive method embodiment:
A. set converter valve submodule capacitance voltage, and according to formula U
Dc=U
cN
SM/ 2 calculate dc-link capacitance voltage, wherein, and U
DcBe dc-link capacitance voltage, U
cBe submodule capacitance voltage, n
SMBe the actual sub-series number of modules that puts into operation;
When B. test starts, realize soft opening by ac input end first, when dc-link capacitance voltage reaches U
DcAfter, by control test unit is charged to each sub-series module capacitance through the load reactance device by dc bus, press the operation of BOOST boosting mode, and monitor each submodule capacitance voltage, until each submodule capacitance voltage is U
c, then start complete;
C. discharged to dc bus through the load reactance device by the sub-series module, send the IGBT trigger pulse, circuit is moved by BUCK step-down mode, test unit constantly repeats the above-mentioned BUCK-BOOST method of operation afterwards, the actual steady state operating condition of ASM.
D. after experiment finishes, the trigger pulse of locking IGBT, output bleed-off circuit IGBT trigger pulse, the release of dc-link capacitance energy is complete, perhaps after experiment finishes, disconnect input killer switch (KM1), make device work in the pattern of releasing, system capacity is discharged complete by the LC loop;
E. can change next group submodule to be tested directly with all tested submodule undercarriages after test is finished, re-execute step (A) ~ (E), until all submodules all are completed.
Test unit of the present invention is when steady-state operation, tested converter valve group is operated under the phase shift pulse width modulation mode, the two ends of converter valve group obtain voltage waveform as shown in Figure 3, comprise submodule capacitance voltage waveform and system's dc-link capacitance voltage waveform, by the pulse control to each submodule IGBT, can change the charge and discharge process of antithetical phrase module capacitance, the electric current of each submodule is flow through in simultaneously control, realize that the multi-tool piece carries out the purpose of stable state large power test simultaneously, and obtain as shown in Figure 4 current waveform, the present invention can satisfy the test request of varying number submodule by adjusting the output of three-phase regulator.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; after the those skilled in the art reads the application; the present invention is carried out the behavior of various modifications or change with reference to above-described embodiment, all within application right application requirement protection domain.
Claims (7)
1. high-power operating test device of flexible DC power transmission converter valve stable state, comprise isolating transformer (TR1), rectifier bridge (REC1) and converter valve group, the ac input end of described rectifier bridge connects isolating transformer, its dc output end connects the converter valve group, it is characterized in that, this experimental provision also comprises a BUCK-BOOST step-up/step-down circuit, this step-up/step-down circuit comprises an IGBT module that is comprised of IGBT and anti-paralleled diode, resistance (R), dc bus Support Capacitor (C1) and load reactance device (L1), resistance (R) and the dc output end that is connected in parallel on described rectifier bridge (REC1) after the IGBT module is connected, described dc bus Support Capacitor (C1) is connected in parallel on the two ends of resistance (R) and IGBT module series arm, and connects the converter valve group by load reactance device (L1).
2. the high-power operating test device of flexible DC power transmission converter valve stable state according to claim 1, it is characterized in that, this test unit also is provided with isolating switch input switch (KM), three-phase regulator (TY) and filter reactor (LR), described isolating switch input switch (KM) connects three-phase supply, and connects successively with three-phase regulator (TY), filter reactor (LR) and isolating transformer (TR1).
3. the high-power operating test device of flexible DC power transmission converter valve stable state according to claim 1, it is characterized in that, described converter valve group is comprised of the converter valve submodule (SM) of one group of series connection, comprises the converter valve submodule and the redundant converter valve submodule that put into operation.
4. the high-power operating test device of flexible DC power transmission converter valve stable state according to claim 3, it is characterized in that, described converter valve submodule is by submodule by-pass switch (K1n), two IGBT modules (T1n and T1m), thyristor (Tn), submodule electric capacity (C
SM1N) and resistance (R1n) composition, described IGBT module is comprised of an IGBT device and an antiparallel diode, described two IGBT modules (T1n and T1m) series connection, resistance (R1n) and submodule capacitor (C
SM1N) being connected in parallel on successively the two ends of two IGBT modules (T1n and T1m) series arm, by-pass switch (K1n), thyristor (Tn) are connected in parallel on the two ends of one of them IGBT module (T1m) successively.
5. the test method of a test unit as claimed in claim 1 is characterized in that, step is as follows:
(1) set submodule capacitance voltage and calculate dc bus Support Capacitor voltage, closed test unit AC input killer switch (KM1), test unit begins to start;
(2) when dc bus Support Capacitor voltage reaches the magnitude of voltage that calculates, the control dc bus is through the capacitor charging of load reactance device to the converter valve submodule of each series connection, until each submodule capacitance voltage is when all reaching setting voltage value, test unit starts complete;
(3) test unit start complete after, the IGBT of each series connection converter valve submodule is sent out trigger pulse, discharged to dc bus through the load reactance device by the converter valve submodule electric capacity of each series connection.Afterwards, test unit constantly repeats converter valve submodule capacitor charge and discharge process, and circuit enters the steady-state operation state;
(4) when a converter valve submodule fault detecting in the test run process in the converter valve group, the by-pass switch of closed this fault submodule disconnects, with this fault submodule bypass, simultaneously, the by-pass switch of a redundant converter valve submodule is disconnected, it is put into operation;
(5) trigger pulse of locking converter valve submodule IGBT, output bleed-off circuit IGBT trigger pulse, the release of dc-link capacitance energy is complete, off-test; Perhaps, disconnect input killer switch (KM1), by the LC loop system capacity is discharged complete, off-test.
(6) after one group of converter valve submodule test is finished, replaceable next group converter valve submodule to be tested re-executes step (1) ~ (5).
6. test method according to claim 5 is characterized in that, the computing method of described dc bus Support Capacitor voltage are: U
Dc=U
cN
SM/ 2, wherein, U
DcBe dc bus Support Capacitor voltage, U
cConverter valve submodule capacitance voltage, n
SMThe converter valve submodule number that puts into operation for test.
7. test method according to claim 5 is characterized in that, what in the step (3) pulsed modulation of converter valve submodule is adopted is the phase shift pulse width modulation mode.
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| CN201210507352.7A CN103033701B (en) | 2012-11-30 | 2012-11-30 | The high-power operating test device of flexible direct current transmission converter valve stable state and test method |
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| CN201210507352.7A CN103033701B (en) | 2012-11-30 | 2012-11-30 | The high-power operating test device of flexible direct current transmission converter valve stable state and test method |
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