CN103033701B - The high-power operating test device of flexible direct current transmission converter valve stable state and test method - Google Patents
The high-power operating test device of flexible direct current transmission converter valve stable state and test method Download PDFInfo
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Abstract
The present invention relates to a kind of high-power operating test device of flexible direct current transmission converter valve stable state and test method, the experimental rig includes isolating transformer (TR1), rectifier bridge（REC1）With converter valve valve group, the ac input end connection isolating transformer of the rectifier bridge, its DC output end connects converter valve valve group, and the experimental provision also includes a BUCK BOOST step-up/step-down circuit, and the step-up/step-down circuit includes the IGBT module being made up of IGBT and anti-paralleled diode, a resistance（R）, dc bus Support Capacitor（C1）With load reactance device (L1), resistance（R）The rectifier bridge is connected in parallel on after being connected with IGBT module（REC1）DC output end, the dc bus Support Capacitor（C1）It is connected in parallel on resistance（R）With the two ends of IGBT module series arm, and pass through load reactance device (L1) connect converter valve valve group.By building and actual steady state operating condition identical test platform, progress converter valve steady state power operation test, to element current, voltage and the detection of temperature rise, the correctness of checking converter valve design.
Description
Technical field
The present invention relates to a kind of high-power operating test device of flexible direct current transmission converter valve stable state and test method.
Background technology
The characteristics of generally having high voltage, heavy current, Large Copacity due to flexible DC power transmission (VSC-HVDC) device, causes
Tested in experimental enviroment it is difficult to build and carry circuit entirely with actual operating mode identical, therefore, how in experimental enviroment
Middle to build equivalent hookup, carrying out the experiment suitable with actual operating mode intensity turns into the key solved the problems, such as.
It is a kind of new skill that direct current transportation is carried out using IGBT valves based on the VSC-HVDC of modular multilevel converter valve
Art, submodule (SM) is the minimum power unit for constituting converter valve, and it is composed in parallel by the IGBT half-bridges constituted and capacitor, if
Dry sub- block coupled in series constitutes a converter valve components, and it is capable of the electrical characteristic of proportional embodiment converter valve, is to carry out the change of current
The basic electric unit of valve Tests at Steady State.
Generally, a VSC-HVDC converter valves engineering project includes thousands of submodules, if to all submodules one by one
Steady state power experiment is carried out, this will be a cumbersome and time consuming engineering, and the purpose of steady state power experiment is to production technology
Link is tested, and checks for the place of element temperaturing lifting abnormality, therefore the big work(of the simple flexible direct current transmission converter valve of science
Rate steady state test method is particularly important, can produce in enormous quantities for flexible direct current transmission converter valve and lay a good foundation.
The content of the invention
It is an object of the invention to provide a kind of high-power operating test device of flexible direct current transmission converter valve stable state and experiment
Method, carries circuit progress converter valve steady state power operation test, to element electricity entirely by building with actual operating mode identical
Stream, voltage and the detection of temperature rise, the correctness of checking converter valve design.
To achieve the above object, device scheme of the invention is：A kind of high-power fortune of flexible direct current transmission converter valve stable state
Row experimental rig, including isolating transformer (TR1), rectifier bridge (REC1) and converter valve valve group, the exchange input of the rectifier bridge
End connection isolating transformer, its DC output end connection converter valve valve group, experimental rig also includes a BUCK-BOOST liter
Reduction voltage circuit, the step-up/step-down circuit includes the first IGBT module, a first resistor being made up of IGBT and anti-paralleled diode
(R), dc bus Support Capacitor (C1) and load reactance device (L1), first resistor (R) are in parallel after being connected with the first IGBT module
In the rectifier bridge (REC1) DC output end, the dc bus Support Capacitor (C1) is connected in parallel on first resistor (R) and the
The two ends of one IGBT module series arm, and converter valve valve group is connected by load reactance device (L1).
The experimental rig is additionally provided with breaker input switch (KM), three-phase regulator (TY) and filter reactor (LR), institute
Breaker input switch (KM) connection three phase mains is stated, and with three-phase regulator (TY), filter reactor (LR) and isolating transformation
Device (TR1) is sequentially connected in series.
The converter valve valve group is made up of the converter valve submodule of one group of series connection, including the converter valve submodule put into operation
With redundancy converter valve submodule.
The converter valve submodule is by submodule by-pass switch (K1n), two the second IGBT modules (T1n and T1m), brilliant locks
Manage (Tn), submodule electric capacity (CSM1N) and second resistance (R1n) composition, second IGBT module is by an IGBT device and one
Individual antiparallel diode composition, described two second IGBT module (T1n and T1m) series connection, second resistance (R1n) and submodule
Electric capacity (CSM1N) two ends of two the second IGBT modules (T1n and T1m) series arm, by-pass switch (K1n), crystalline substance are connected in parallel on successively
Brake tube (Tn) is connected in parallel on the two ends of one of them the second IGBT module (T1m) successively.
The present invention method scheme be：A kind of high-power running test method of flexible direct current transmission converter valve stable state, step
It is as follows：
(1) set submodule capacitor voltage and calculate dc bus Support Capacitor voltage, closure experimental rig AC breaks
Road device input switch (KM), experimental rig starts to start；
(2) when dc bus Support Capacitor voltage reaches the magnitude of voltage calculated, control dc bus is through load reactance
Device charges to the electric capacity of the converter valve submodule of each series connection, when each submodule capacitor voltage reaches setting magnitude of voltage, examination
Experiment device, which starts, to be finished；
(3) after experimental rig startup is finished, trigger pulse is sent out to the IGBT of each series connection converter valve submodule, by each series connection
Converter valve submodule electric capacity discharges through load reactance device to dc bus.Afterwards, experimental rig constantly repeats converter valve submodule
Capacitor charge and discharge process, circuit enters steady-state operating condition；
(4) when detecting in converter valve valve group converter valve sub-module fault during test run, closure should
The by-pass switch of failure submodule, the failure submodule is bypassed, meanwhile, by the by-pass switch of a redundancy converter valve submodule
Disconnect, put into operation；
(5) locking converter valve submodule IGBT trigger pulse, exports bleed-off circuit IGBT trigger pulses, by dc bus
Capacitive energy release is finished, off-test；Or, cut-off breaker input switch (KM), by by dc bus Support Capacitor
(C1) and load reactance device (L1) composition LC loops by system capacity release finish, off-test；
(6) after one group of converter valve submodule test is completed, replaceable next group converter valve submodule to be tested, weight
It is new to perform step (1)~(5).
The computational methods of the dc bus Support Capacitor voltage are：Udc=Uc·nSM/ 2, wherein, UdcFor dc bus
Support Capacitor voltage, UcConverter valve submodule capacitor voltage, nSMTo test the converter valve submodule number put into operation.
Phase-shifted pulse width modulation mode is used to the impulse modulation of converter valve submodule in step (3).
The beneficial effect that the present invention reaches：The present invention is by building an experiment similar with actual steady state operating condition
One group of redundancy submodule is additionally provided with platform, converter valve valve group, when detecting operating sub-module fault, side can be passed through
Way switch bypasses failure submodule, and a corresponding redundancy submodule is put into operation, realize multi-tool block high voltage,
Power ring steady-state behaviour test under the conditions of high current and stable calorific intensity, can meet to multiple submodule while testing
Requirement.
And the present invention realizes the discharge and recharge to electric capacity, observation submodule electric current and electricity simply by a step-up/step-down circuit
The change of pressure, control mode is simple, operation is flexible, can well reappear the actual steady state operating condition of submodule.
Brief description of the drawings
Fig. 1 is experimental rig schematic diagram of the present invention；
Fig. 2 is converter valve submodular circuits structure chart of the present invention；
Fig. 3 is experimental rig capacitance voltage oscillogram of the present invention；
Fig. 4 is experimental rig load reactance device current waveform figure of the present invention；
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Apparatus of the present invention embodiment：
Such as Fig. 1, experimental rig of the invention include 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 change of current valve group, the change of current valve group are changed by n+k
Stream valve submodule SM1~SM (n+k) is composed in series, including k redundancy submodule, and the submodule number actually put into operation is n
Individual, the change of current valve group is connected in parallel on the DC output end of rectifier bridge, BUCK-BOOST step-up/step-down circuits include the first IGBT module T,
With first IGBT module T first resistor R1, the dc bus Support Capacitor C1 connected and load reactance device L1, dc bus branch
Support electric capacity C1 is connected in parallel on the first IGBT module T and first resistor R1 series arms two ends, and rectifier bridge REC1 passes through load reactance
Device L1 connection change of current valve groups.
The converter valve submodule of the device includes the half-bridge structure and submodule electric capacity of two series connection, and half-bridge structure includes
By-pass switch K1n, second resistance R1n, IGCT Tn, two the second IGBT module T1n and T1m, the second IGBT module is by one
IGBT device and an antiparallel diode composition, the second IGBT module T1n and T1 series connection, second resistance R1n and submodule
Electric capacity CSM1NThe two ends of T1n and T1m series arms are connected in parallel on successively, and by-pass switch K1n, IGCT Tn are connected in parallel on T1m's successively
Two ends, each converter valve submodule is cascaded by respective by-pass switch, the side of each converter valve submodule put into operation
Way switch disconnects, the by-pass switch closure of remaining redundancy submodule, when wherein some sub-module fault put into operation, by this
The by-pass switch closure of submodule, the submodule is bypassed, and the by-pass switch of a redundancy submodule is disconnected, and is put into
Operation, it is ensured that the submodule number of test run is constant.
The inventive method embodiment：
A. converter valve submodule capacitor voltage is set, and according to formula Udc=Uc·nSM/ 2 calculate dc-link capacitance electricity
Pressure, wherein, UdcFor dc-link capacitance voltage, UcFor submodule capacitor voltage, nSMFor the series connection submodule actually put into operation
Number；
B. experiment start when, first by ac input end realize it is soft open, when dc-link capacitance voltage reaches UdcAfter, pass through
Control makes experimental rig be charged from dc bus through load reactance device to each sub-series module capacitance, is transported by BOOST boosting modes
OK, and each submodule capacitor voltage is monitored, until each submodule capacitor voltage is Uc, then start and finish；
C. discharged from series connection submodule through load reactance device to dc bus, send IGBT trigger pulses, make circuit by
BUCK decompressions mode is run, and experimental rig constantly repeats the above-mentioned BUCK-BOOST methods of operation afterwards, and ASM is actually steady
State operating condition.
D. after experiment terminates, locking IGBT trigger pulse exports bleed-off circuit IGBT trigger pulses, by dc bus electricity
Hold energy release to finish, or after experiment terminates, cut-off breaker input switch (KM) makes device work in the pattern of releasing,
System capacity release is finished by LC loops；
E. next group submodule to be tested can be changed, again directly by all tested submodule undercarriages after test is completed
Step (A)~(E) is performed, is all completed until by all submodules.
Experimental rig of the present invention is in steady-state operation, and tested converter valve valve group is operated under phase-shifted pulse width modulation mode, is changed
The two ends of stream valve valve group obtain voltage waveform as shown in Figure 3, including submodule capacitor voltage waveform and system dc bus
Capacitance voltage waveform, passes through the Pulse Width Control to each submodule IGBT, thus it is possible to vary to the charge and discharge process of sub- module capacitance, together
When control flow through the electric current of each submodule, realize multi-tool block while carrying out the purpose of stable state large power test, and obtain such as Fig. 4
Shown current waveform, the output of the invention by adjusting three-phase regulator can meet the test request of varying number submodule.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, and those skilled in the art reads
After reader application, the behavior of various modifications or change is carried out to the present invention with reference to above-described embodiment, will in application right application
Ask within protection domain.
Claims (7)
1. a kind of high-power operating test device of flexible direct current transmission converter valve stable state, including isolating transformer (TR1), rectifier bridge
(REC1) and converter valve valve group, the ac input end connection isolating transformer of the rectifier bridge, the connection change of current of its DC output end
Valve valve group, it is characterised in that the experimental rig also includes a BUCK-BOOST step-up/step-down circuit, the BUCK-BOOST liftings
Volt circuit includes the first IGBT module being made up of IGBT device and anti-paralleled diode, first resistor (R), a dc bus
Support Capacitor (C1) and load reactance device (L1), first resistor (R) are connected in parallel on the rectifier bridge after being connected with the first IGBT module
(REC1) DC output end, the dc bus Support Capacitor (C1) is connected in parallel on first resistor (R) and the first IGBT module string
Join the two ends of branch road, and converter valve valve group is connected by load reactance device (L1).
2. the high-power operating test device of flexible direct current transmission converter valve stable state according to claim 1, it is characterised in that
The experimental rig is additionally provided with breaker input switch (KM), three-phase regulator (TY) and filter reactor (LR), the breaker
Input switch (KM) connect three phase mains, and with three-phase regulator (TY), filter reactor (LR) and isolating transformer (TR1) according to
Secondary series connection.
3. the high-power operating test device of flexible direct current transmission converter valve stable state according to claim 1, it is characterised in that
The converter valve valve group is made up of the converter valve submodule of one group of series connection, including the converter valve submodule and redundancy that put into operation are changed
Flow valve submodule.
4. the high-power operating test device of flexible direct current transmission converter valve stable state according to claim 3, it is characterised in that
The converter valve submodule by submodule by-pass switch, IGBT module T1n, IGBT module T1m, IGCT, submodule electric capacity and
Second resistance is constituted, and the IGBT module T1n and IGBT module T1m are by an IGBT device and an antiparallel diode
Composition, IGBT module T1n and IGBT module the T1m series connection, second resistance is connected in parallel on by IGBT moulds successively with submodule electric capacity
The two ends of the series arm of block T1n and IGBT module T1m compositions, submodule by-pass switch, IGCT are connected in parallel on IGBT moulds successively
Block T1m two ends.
5. a kind of test method of experimental rig as claimed in claim 4, it is characterised in that step is as follows:
(1) set submodule capacitor voltage and calculate dc bus Support Capacitor (C1) voltage, closure experimental rig AC breaks
Road device input switch (KM), experimental rig starts to start；
(2) when dc bus Support Capacitor (C1) voltage reaches the magnitude of voltage calculated, control dc bus is through load reactance
Device (L1) charges to the submodule electric capacity of the converter valve submodule of each series connection, until each submodule capacitor voltage reaches setting electricity
During pressure value, experimental rig, which starts, to be finished；
(3) after experimental rig startup is finished, the IGBT device to each series connection converter valve submodule sends out trigger pulse, by each series connection
The submodule electric capacity of converter valve submodule is discharged through load reactance device (L1) to dc bus, and afterwards, experimental rig is constantly repeated
The submodule capacitor charge and discharge process of converter valve submodule, circuit enters steady-state operating condition；
(4) when detecting in converter valve valve group converter valve sub-module fault during test run, the failure is closed
The submodule by-pass switch of converter valve submodule, the failure converter valve submodule is bypassed, meanwhile, by redundancy converter valve
The submodule by-pass switch of module disconnects, and is put into operation；
(5) trigger pulse of locking converter valve submodule IGBT device, exports bleed-off circuit IGBT device trigger pulse, by direct current
The release of bus Support Capacitor (C1) energy is finished, off-test；Or, cut-off breaker input switch (KM), by by direct current
The LC loops of bus Support Capacitor (C1) and load reactance device (L1) composition finish system capacity release, off-test；
(6) after one group of converter valve submodule test is completed, replaceable next group converter valve submodule to be tested is held again
Row step (1)~(5).
6. test method according to claim 5, it is characterised in that the meter of dc bus Support Capacitor (C1) voltage
Calculation method is：Udc=Uc·nSM/ 2, wherein, UdcFor dc bus Support Capacitor (C1) voltage, UcThe submodule of converter valve submodule
Block capacitance voltage, nSMTo test the converter valve submodule number put into operation.
7. test method according to claim 5, it is characterised in that adjusted in step (3) to the pulse of converter valve submodule
System uses phase-shifted 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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