CN106787087A - Hybrid MMC sequences pressure charging method, startup method and device - Google Patents
Hybrid MMC sequences pressure charging method, startup method and device Download PDFInfo
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- CN106787087A CN106787087A CN201710013344.XA CN201710013344A CN106787087A CN 106787087 A CN106787087 A CN 106787087A CN 201710013344 A CN201710013344 A CN 201710013344A CN 106787087 A CN106787087 A CN 106787087A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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Abstract
The invention provides a kind of hybrid MMC sequences pressure charging method, startup method and device, together with half-bridge submodule be ranked up full-bridge submodule by equal pressure sequence charging method, to carry out actively, pressure charges excision voltage several submodules higher, until submodule voltage is close to rated value, transverter is unlocked；Wherein, when full-bridge submodule receives blocking order to be charged, any full-controlled device is turned on, turns off its excess-three full-controlled device.The present invention need not judge the sense of current, you can complete the startup charging process of the hybrid MMC of submodule, effectively avoid due to half-bridge and the inconsistent caused charging stage end submodule voltage pulsation problem of full-bridge topology.
Description
Technical field
The invention belongs to technical field of direct current power transmission, and in particular to hybrid MMC sequences pressure charging method, startup method
And device.
Background technology
With the application of the development and Power Electronic Technique of all-controlling power electronics device in power system, based on voltage
The Technology of HVDC based Voltage Source Converter of source transverter is increasingly subject to pay attention to.Modularization multi-level converter (Modular multilevel
Converter, MMC) be voltage source converter in flexible direct current power transmission system application one kind, it is by multiple submodule according to one
Fixed mode is formed by connecting, by the alternating current for controlling the input and excision state of each submodule IGBT groups to export transverter
Nearly sine wave is oppressed, the high efficiency of transmission of energy is realized.
In traditional modularization multi-level converter, generally using unit based on the semibridge system submodule shown in Fig. 1,
To reduce transverter construction cost.Traditional semibridge system submodule MMC cannot be special by itself when direct-current short circuit failure occurs
Property suppresses rapidly fault current, it is necessary to could remove fault current by AC circuit breaker or dc circuit breaker.On the one hand due to
The response time of AC circuit breaker is more long, it is possible to cause protection to cause transverter overcurrent damage not in time；On the one hand configure
Dc circuit breaker improves the technical requirements to equipment, increased system cost.
In order to solve this problem, there is scholar to propose to solve this using half-bridge plus the hybrid MMC topologys of full-bridge submodule
One problem.By rapid locking transverter after failure, the reverse blocking capability using diode in full-bridge submodule suppresses rapidly
Fault current, realizes the self-cleaning of DC Line Fault.If additionally, full-bridge submodule number meets certain condition in bridge arm, may be used also
To generate the ability of negative level using full-bridge submodule, DC voltage is reduced to 0 in the case where maintenance AC is grid-connected, from
And suppress fault current, realize that the DC Line Fault under not blocking is passed through.
Application publication number discloses the mould of a kind of full-bridge and half-bridge submodule series-parallel connection for the Chinese patent of CN 105119508A
Block multilevel converter and startup method, the method input coefficient first is soft to open resistance, closes AC circuit breaker, carries out nature
It is soft to open the stage, after group module voltage reaches piezoelectric voltage, to be pressed the stage into soft opening, L submodule of excision continues to charge, and treats
After system stabilization, i.e., charging current is decayed to close to zero, and excision is soft to open resistance, and unblock transverter carries out constant DC voltage control,
Continue to charge to stabilization, charging complete.The method presses strategy after uncontrollable rectifier charging terminates using simple sequence, by
The submodule voltage of system is caused to be fluctuated back and forth in a larger scope, it is impossible to reach the steady-state value of needs.
In addition, there is scholar to propose by judging the sense of current, in the sense of current to cut off all full-bridge submodules when bearing, protect
The uniformity of submodule voltage after charging complete is demonstrate,proved.But smaller in view of charging current in the second half section of charging, the sense of current is sentenced
Breaking will be extremely difficult, larger current impact is will appear from after judging by accident, therefore be not suitable for engineer applied.
The content of the invention
It is an object of the invention to provide a kind of hybrid MMC sequences pressure charging method, startup method and device, it is used to solve
Certainly cause larger electricity because judging the sense of current mistake during the hybrid modularization multi-level converter charge initiation of half-bridge and full-bridge
Flow the problem of impact.
In order to solve the above technical problems, the technical scheme is that：
The present invention provides a kind of hybrid MMC sequences and presses charging method, by full-bridge submodule together with half-bridge submodule
It is ranked up, to carry out actively, pressure charges the submodule of excision voltage setting value number higher, until submodule voltage connects
Nearly rated value, unlocks transverter；Wherein, when full-bridge submodule receives blocking order to be charged, one of them is turned on complete
Control device, turns off its excess-three full-controlled device.
The present invention also provides a kind of hybrid MMC and starts method, including following method scheme：
Method scheme one, comprises the following steps：
1) precharge step；
2) charge step is pressed in sequence：Full-bridge submodule is ranked up together with half-bridge submodule, excision voltage is higher
The submodule of setting value number to carry out actively, pressure charges, until submodule voltage is close to rated value, unlock transverter；Its
In, when full-bridge submodule receives blocking order to be charged, one of full-controlled device is turned on, turn off the full control of its excess-three
Device.
Method scheme two, on the basis of method scheme one, the precharge step includes：Through soft resistance pair of AC
Transverter carries out uncontrollable rectifier and charges until submodule voltage stabilization.
Method scheme three, on the basis of method scheme two, to all full-bridge submodules, turns on one of them full control device
Part, turns off its excess-three full-controlled device, continues to charge, and voltage bypasses soft resistance after stablizing again.
The present invention also provides a kind of hybrid MMC sequence and presses charging device, including for by full-bridge submodule and half-bridge
Submodule is ranked up together, and to carry out actively, pressure charges the submodule of excision voltage setting value number higher, until sub
Module voltage unlocks the module of transverter close to rated value；Wherein, charged when full-bridge submodule receives blocking order
When, one of full-controlled device is turned on, turn off its excess-three full-controlled device.
The present invention also provides a kind of hybrid MMC starters, including following device scheme：
Device scheme one, including such as lower module：
Pre-charge module；
Charging module is pressed in sequence：For full-bridge submodule to be ranked up together with half-bridge submodule, excision voltage compared with
To carry out actively, pressure charges the submodule of setting value number high, until submodule voltage is close to rated value, unlocks transverter；
Wherein, when full-bridge submodule receives blocking order to be charged, one of full-controlled device is turned on, turns off its excess-three complete
Control device.
Device scheme two, on the basis of device scheme one, the pre-charge module includes：For through the soft electrification of AC
Resistance carries out uncontrollable rectifier to transverter and charges until submodule voltage stabilization.
Device scheme three, on the basis of device scheme two, also including for all full-bridge submodules, conducting wherein
Individual full-controlled device, turns off its excess-three full-controlled device, continues to charge, and voltage bypasses the soft module of resistance after stablizing again.
Beneficial effects of the present invention：
It is of the invention to propose that charging method and device are pressed in a kind of hybrid MMC sequences, full-bridge submodule and half-bridge is sub
Module is ranked up together, and to carry out actively, pressure charges excision voltage several submodules higher, until submodule voltage
Close to rated value, during unblock transverter, for full-bridge submodule, when receiving blocking order and being charged, turn on any complete
Control device, turns off its excess-three full-controlled device.Due to the effect that this sequence is pressed, voltage full-bridge submodule higher will be cut
Remove, half-bridge submodule constantly charges, two class submodule voltages will be approached rapidly.Due to the change of full-bridge submodule triggering rule,
So that full-bridge submodule simulates half-bridge submodule, two class submodule charging intervals approached, will charge near rated value together.Should
Method and device helps half-bridge MMC hybrid with full-bridge to start method and device complete in the case where that need not judge the sense of current
Charged into starting.
In addition, the present invention also proposes that a kind of hybrid MMC starts method and device, its core is using above-mentioned hybrid
Charging method and device are pressed in MMC sequences, and full-bridge submodule triggering rule is changed in the sequence pressure charging stage so that
Full-bridge submodule simulates half-bridge submodule, half-bridge submodule is charged near rated value together with full-bridge submodule.
Half-bridge is completed by need not judging in the case of current methods to be charged with the startup of the hybrid MMC of full-bridge, effectively avoid due to
Charging stage end submodule voltage pulsation problem caused by half-bridge is inconsistent with full-bridge topology.
Brief description of the drawings
Fig. 1 is the topological structure schematic diagram of the hybrid MMC of submodule；
Fig. 2-a are that all IGBT are turned off and electric current is timing half-bridge submodule current path schematic diagram；
Fig. 2-b are all IGBT shut-offs and electric current is half-bridge submodule current path schematic diagram when bearing；
Fig. 3-a are that all IGBT are turned off and electric current is timing full-bridge submodule current path schematic diagram；
Fig. 3-b are all IGBT shut-offs and electric current is full-bridge submodule current path schematic diagram when bearing；
Fig. 4-a are that only T4 IGBT are opened and electric current is timing full-bridge submodule current path schematic diagram；
Fig. 4-b are full-bridge submodule current path schematic diagrames when only T4 IGBT are opened and electric current is negative；
Fig. 5-a are only T2 and T4 IGBT conductings and electric current is the excision state current path signal of timing full-bridge submodule
Figure；
Fig. 5-b are only T2 and T4 IGBT conductings and electric current is full-bridge submodule excision state current path signal when bearing
Figure；
Fig. 6 is that the hybrid MMC of submodule of present invention description starts method flow diagram；
Fig. 7-a are that only T3 IGBT are opened and electric current is timing full-bridge submodule current path schematic diagram；
Fig. 7-b are full-bridge submodule current path schematic diagrames when only T3 IGBT are opened and electric current is negative；
Fig. 8-a are only T1 and T3 IGBT conductings and electric current is the excision state current path signal of timing full-bridge submodule
Figure；
Fig. 8-b are only T1 and T3 IGBT conductings and electric current is full-bridge submodule excision state current path signal when bearing
Figure.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the invention is described in further detail.
Hybrid MMC of the invention starts embodiment of the method：
It is as shown in Figure 1 the topological structure schematic diagram suitable for mixing MMC of the invention, each bridge arm includes n half-bridge
Formula module HBSM and (N-n) individual full-bridge type submodule FBSM.Booting sequence figure is as shown in Figure 6.
Specifically：
1) with soft resistance, uncontrollable rectifier charging is carried out.Now all half-bridges and full-bridge submodule are in blocking,
I.e. all of IGBT is in off state.
During being somebody's turn to do, for half-bridge submodule, when electric current is timing, current path fills as shown in Fig. 2-a to electric capacity
Electricity；When electric current is to bear, current path does not charge as shown in Fig. 2-b to electric capacity.I.e.：Stable state is reached in submodule voltage
During, half-bridge submodule in the lockout condition, only in electric current for timing is charged to electric capacity.
During being somebody's turn to do, for full-bridge submodule, when electric current is timing, current path fills as shown in Fig. 3-a to electric capacity
Electricity；When electric current is to bear, current path equally charges as shown in Fig. 3-b to electric capacity.I.e.：Reach steady in submodule voltage
During state, in the lockout condition, no matter electric current is just or negative to full-bridge submodule, and electric capacity is charged.
Therefore, at the end of the stage, full-bridge submodule voltage will be above half-bridge submodule voltage.
2) half-bridge submodule maintains blocking constant, the T4 conductings of triggering full-bridge submodule, and T1, T2, T3 are still turned off.Electricity
After pressure stabilization, soft resistance is cut off.
Should during, for half-bridge submodule, the half-bridge submodule charge condition under different electric currents ibid, such as Fig. 2-a and
Shown in Fig. 2-b.
During being somebody's turn to do, for full-bridge submodule, when electric current is timing, circuit circulation figure as depicted in fig. 4-a, is carried out to electric capacity
Charge；When electric current is to bear, current flowing figure does not charge as shown in Fig. 4-b to electric capacity.Now, have with half-bridge submodule
There are similar characteristics.
Therefore, in the phase process, the charging voltage flowed through in full-bridge submodule voltage and half-bridge submodule is just the same,
Voltage rises jointly, and gap between the two is still present, but no longer becomes big.
3) full-bridge submodule is ranked up together with half-bridge submodule and is pressed.Wherein, the locking of half-bridge submodule and cut
Except state is constant.Full-bridge submodule makes T1, T2, T3 turn off after locking order is received, T4 conductings；Receiving excision life
After order, T1, T3 are turned off, turn on T2, T4.
During being somebody's turn to do, for half-bridge submodule, after locking order is received, T01 and T02 is turned off；Receiving excision
During order, T01 is turned off, turn on T02, electric capacity is bypassed.
During being somebody's turn to do, to full-bridge submodule, after locking order is received, T1, T2, T3 are turned off, turn on T4, circuit circulation
Figure is as shown in Fig. 4-a and Fig. 4-b；After excision order is received, T1, T3 are turned off, turn on T2, T4.When electric current is timing, circuit
Circulation figure charges as shown in Fig. 5-a to electric capacity；When electric current is to bear, circuit circulation is schemed as shown in Fig. 5-b, not to electric capacity
Charged, electric current is identical with half-bridge submodule charging effect through turning on IGBT or diode continuousing flow.
When the process starts, due to the effect that sequence is pressed, voltage full-bridge submodule higher will be removed, half-bridge submodule
Block is constantly charged, and two class submodule voltages will be approached rapidly.Afterwards, due to the change of full-bridge submodule triggering rule, two classes
The module charging interval approaches, and will charge near rated value together, uneven there is no voltage, can directly unlock.
The method completes the startup charging process of the hybrid MMC of submodule by need not judging the sense of current, effectively
Avoid due to half-bridge and the inconsistent caused charging stage end submodule voltage pulsation problem of full-bridge topology.
The core of the method is the 3) step, i.e., charging method is pressed there is provided a kind of hybrid MMC sequences, in the process
In, for full-bridge submodule, when receiving blocking order and being charged, any full-controlled device is turned on, turn off its excess-three complete
Control device so that, equivalent to a half-bridge submodule, the charging effect of two class submodules is identical, so as to reach two for full-bridge submodule
The rapid close purpose of class submodule voltage.
Meanwhile, in order to improve the uniformity of the voltage in pre-charging stage, after uncontrollable rectifier charging is carried out to submodule,
Above-mentioned triggering control strategy is also adopted by charge full-bridge submodule, namely step 2).In this embodiment, in step 2)
With step 3) in, by turning on T4, turn off T1, T2, T3 to make full-bridge submodule in electric current for electric capacity is charged in timing,
Electric current does not charge when being negative to electric capacity, so as to reach the purpose for having similar characteristics with half-bridge submodule.As other realities
Mode is applied, any IGBT in T1, T2, T3 can be turned on, turn off its excess-three IGBT, full-bridge submodule is simulated half-bridge
Submodule, reaches identical effect.
Wherein, if conducting T3, turn off T1, T2, T4, then current flowing as shown in Fig. 7-a and Fig. 7-b, in this case,
Electric current charges when being negative to electric capacity, in electric current for timing is not charged to electric capacity.
In the present embodiment, in step 3) in, for full-bridge submodule, after excision order is received, T1, T3 are turned off,
Conducting T2, T4, to reach the effect of shunt capacitance.As other embodiment, T2, T4 can be turned off, turn on T1, T3, circuit stream
Logical figure can equally reach the effect of shunt capacitance as shown in Fig. 8-a and Fig. 8-b.
In addition, the present invention also provides a kind of hybrid MMC sequence presses charging device, including for by full-bridge submodule with
Half-bridge submodule is ranked up together, and to carry out actively, pressure charges excision voltage setting value number submodule higher, until
Submodule voltage unlocks the module of transverter close to rated value；Wherein, charged when full-bridge submodule receives blocking order
When, one of full-controlled device is appointed in conducting, turns off its excess-three full-controlled device.
The present invention also provides a kind of hybrid MMC starters, including such as lower module：
Pre-charge module；
Charging module is pressed in sequence：For full-bridge submodule to be ranked up together with half-bridge submodule, excision voltage compared with
To carry out actively, pressure charges the submodule of setting value number high, until submodule voltage is close to rated value, unlocks transverter；
Wherein, when full-bridge submodule receives blocking order to be charged, one of full-controlled device is turned on, turns off its excess-three complete
Control device.
Charging device and hybrid MMC starters are pressed in above-mentioned hybrid MMC sequences, are actually based in the present invention
State a kind of computer solution of corresponding method flow, above-mentioned various modules be it is corresponding with method flow respectively process into
Journey or program.Because the sufficiently clear of the introduction to the above method is complete, therefore the dress that no longer charged to hybrid MMC sequences pressure
Put and hybrid MMC starters are described in detail.
Claims (8)
1. charging method is pressed in a kind of hybrid MMC sequences, it is characterised in that enter full-bridge submodule together with half-bridge submodule
Row sequence, to carry out actively, pressure charges the submodule of excision voltage setting value number higher, until submodule voltage is close
Rated value, unlocks transverter；Wherein, when full-bridge submodule receives blocking order to be charged, one of them full control is turned on
Device, turns off its excess-three full-controlled device.
2. a kind of hybrid MMC starts method, it is characterised in that comprise the following steps：
1) precharge step；
2) charge step is pressed in sequence：Full-bridge submodule is ranked up together with half-bridge submodule, voltage is higher sets for excision
To carry out actively, pressure charges the submodule of definite value number, until submodule voltage is close to rated value, unlocks transverter；Wherein,
When full-bridge submodule receives blocking order to be charged, one of full-controlled device is turned on, turn off the full control device of its excess-three
Part.
3. hybrid MMC according to claim 2 starts method, it is characterised in that the precharge step includes：Through handing over
Soft of stream side resistance exchange stream device carries out uncontrollable rectifier and charges until submodule voltage stabilization.
4. hybrid MMC according to claim 3 starts method, it is characterised in that to all full-bridge submodules, turn on it
In a full-controlled device, turn off its excess-three full-controlled device, continue to charge, voltage bypasses soft resistance after stablizing again.
5. charging device is pressed in a kind of hybrid MMC sequence, it is characterised in that including for by full-bridge submodule and half-bridge submodule
Block is ranked up together, and to carry out actively, pressure charges the submodule of excision voltage setting value number higher, until submodule
Voltage unlocks the module of transverter close to rated value；Wherein, when full-bridge submodule receives blocking order to be charged, lead
Lead to one of full-controlled device, turn off its excess-three full-controlled device.
6. a kind of hybrid MMC starters, it is characterised in that including such as lower module：
Pre-charge module；
Charging module is pressed in sequence：For full-bridge submodule to be ranked up together with half-bridge submodule, excision voltage is higher
To carry out actively, pressure charges the submodule of setting value number, until submodule voltage is close to rated value, unlocks transverter；Its
In, when full-bridge submodule receives blocking order to be charged, one of full-controlled device is turned on, turn off the full control of its excess-three
Device.
7. hybrid MMC starters according to claim 6, it is characterised in that the pre-charge module includes：For
Uncontrollable rectifier is carried out through soft resistance exchange stream device of AC to charge until the unit of submodule voltage stabilization.
8. hybrid MMC starters according to claim 7, it is characterised in that also including for all full-bridges
Module, turns on one of full-controlled device, turns off its excess-three full-controlled device, continues to charge, and voltage bypasses soft after stablizing again
Play the module of resistance.
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| CN106712248A (en) * | 2017-01-16 | 2017-05-24 | 南京南瑞继保电气有限公司 | Charging method for sub-module-hybrid type converter |
| CN106712238A (en) * | 2017-01-16 | 2017-05-24 | 南京南瑞继保电气有限公司 | Charging method for sub-module-hybrid type converter |
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| CN107681877A (en) * | 2017-10-12 | 2018-02-09 | 华中科技大学 | A kind of mixed type MMC of submodule containing full-bridge starts method |
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