CN108471251A - The startup method and device for the modularization multi-level converter that half-bridge is mixed with full-bridge - Google Patents
The startup method and device for the modularization multi-level converter that half-bridge is mixed with full-bridge Download PDFInfo
- Publication number
- CN108471251A CN108471251A CN201810395466.4A CN201810395466A CN108471251A CN 108471251 A CN108471251 A CN 108471251A CN 201810395466 A CN201810395466 A CN 201810395466A CN 108471251 A CN108471251 A CN 108471251A
- Authority
- CN
- China
- Prior art keywords
- bridge
- full
- voltage
- bridge submodule
- submodule
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention relates to a kind of startup methods for the modularization multi-level converter that half-bridge is mixed with full-bridge.The method includes：It controls the multiple half-bridge submodule and the multiple full-bridge submodule keeps being latched, so that all half-bridge submodules and all full-bridge submodules reach respective initial voltage；It controls the multiple half-bridge submodule and keeps locking, and so that the total voltage of all full-bridge submodules is pushed the speed decline by controlling the working condition of at least partly full-bridge submodule；The working condition of each full-bridge submodule and each half-bridge submodule is controlled respectively, so that the voltage of the voltage of all half-bridge submodules and all full-bridge submodules reaches rated voltage.The invention further relates to a kind of starters for the modularization multi-level converter that half-bridge is mixed with full-bridge.The above method and device can cause larger dash current, to improve the safety of system to avoid in system unlock moment.
Description
Technical field
The present invention relates to power supply technique field, more particularly to modularization multi-level converter that a kind of half-bridge is mixed with full-bridge
Startup method and device.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, abbreviation MMC) is changed by several
It flows the cascade of valve submodule unit and realizes high voltage output.MMC does not need the direct cascade of switching device, unanimously triggers and wants to device
It asks low, additionally has the scalability, many advantages, such as switching frequency is low, running wastage is low, output voltage waveforms quality is high.
But in AC network by MMC to flexible DC power transmission network power supply when, due to flexible DC power transmission network
Low damping characteristic, when short trouble occurs for MMC, failure initial stage current-rising-rate reaches every millisecond of rank of thousands of peaces, and exchange is disconnected
Road device also only has the breaking speed of a few tens of milliseconds, and this few tens of milliseconds can make the critical equipments such as MMC in DC network bear harshness
Electrical stress, reduce in power grid equipment operation safety.Therefore, when short trouble occurs for MMC, network system
Safety is bad.
Invention content
Based on this, it is necessary to which when short trouble occurs for current MMC, the bad problem of the safety of network system carries
For a kind of startup method and device for the modularization multi-level converter that half-bridge is mixed with full-bridge.
A kind of startup method for the modularization multi-level converter that half-bridge is mixed with full-bridge, the modular multilevel change of current
Device includes multiple half-bridge submodules and multiple full-bridge submodules.The method includes：
It controls the multiple half-bridge submodule and the multiple full-bridge submodule keeps being latched, so that all half-bridge submodules
Block and all full-bridge submodules reach respective initial voltage；
It controls the multiple half-bridge submodule and keeps locking, and the working condition by controlling at least partly full-bridge submodule
The total voltage of all full-bridge submodules is set to push the speed decline；Wherein, the working condition of the full-bridge submodule includes locking, half
One kind in locking or bypass；
The working condition of each full-bridge submodule and each half-bridge submodule is controlled respectively, so that the voltage of all half-bridge submodules
Reach rated voltage with the voltage of all full-bridge submodules；Wherein, the working condition of the half-bridge submodule include bypass or
Locking.
The modularization multi-level converter is connected to alternating current by serial connection charge resistance in one of the embodiments,
Net.
It is described in one of the embodiments, that all half-bridge submodules is made to keep locking and at least partly complete by controlling
The working condition of bridge submodule make the total voltage of full-bridge submodule push the speed decline the step of before include：
When the electric current of the charging resistor is less than pre-set current value, the charging resistor bypass is controlled.
It is described in one of the embodiments, that all half-bridge submodules is made to keep locking and at least partly complete by controlling
The working condition of bridge submodule make the total voltage of full-bridge submodule push the speed decline the step of before include：
When the voltage of the charging resistor is more than preset voltage value, the charging resistor bypass is controlled.
It is described in one of the embodiments, that all half-bridge submodules is made to keep locking and at least partly complete by controlling
The working condition of bridge submodule make the total voltage of full-bridge submodule push the speed decline the step of include：
When the voltage of each full-bridge submodule reaches the operation threshold of self-energizing power supply, controls all half-bridge submodules and keep
Locking；
The full-bridge submodule that voltage is controlled not less than first threshold voltage bypasses；
Control voltage is in second threshold voltage to the full-bridge submodule between the first threshold voltage half and is latched；Its
In, the second threshold voltage is less than the first threshold voltage；
Control the full-bridge submodule locking that voltage is less than the second threshold voltage.
It is described in one of the embodiments, that all half-bridge submodules is made to keep locking and at least partly complete by controlling
The working condition of bridge submodule make the total voltage of full-bridge submodule push the speed decline the step of after include：
It is more than default times in the ratio of the average voltage of the average voltage and all full-bridge submodules of all half-bridge submodules
It when number, controls all full-bridge submodules half and is latched, control all half-bridge submodule lockings.
The preset multiple is in the range of 0.6 to 1.4 in one of the embodiments,.
The working condition for controlling each full-bridge submodule and each half-bridge submodule respectively in one of the embodiments,
So that the total voltage of all half-bridge submodules and all full-bridge submodules includes the step of reaching rated voltage：
The full-bridge submodule that voltage is controlled not less than third threshold voltage bypasses, and controls voltage not less than third threshold value electricity
The half-bridge submodule of pressure bypasses.
A kind of starter for the modularization multi-level converter that half-bridge is mixed with full-bridge, the modular multilevel change of current
Device includes multiple half-bridge submodules and multiple full-bridge submodules, and the modularization multi-level converter is connected by serial connection charge resistance
It is connected to AC network.Described device includes：
Starting module is not controlled, keeps being latched for controlling all half-bridge submodules and all full-bridge submodules, so that institute
There are half-bridge submodule and all full-bridge submodules to reach initial voltage；
Half control starting module keeps locking for controlling all half-bridge submodules, and by controlling at least partly full-bridge
The working condition of module makes the total voltage of full-bridge submodule push the speed decline；Wherein, the working condition of the full-bridge submodule
One kind in being latched or bypass including locking, half；
Full control starting module, the working condition for controlling each full-bridge submodule and each half-bridge submodule respectively, so that institute
There is the voltage of half-bridge submodule to reach rated voltage, and the voltage of all full-bridge submodules is made to reach rated voltage；Wherein,
The working condition of the half-bridge submodule includes bypass or locking.
The half control starting module is used to reach self-energizing in the voltage of each full-bridge submodule in one of the embodiments,
When the operation threshold of power supply, controls all half-bridge submodules and keep locking；
The half control starting module is additionally operable to control voltage and is bypassed not less than the full-bridge submodule of first threshold voltage；
The half control starting module is additionally operable to control voltage and is in second threshold voltage between the first threshold voltage
Full-bridge submodule half be latched；Wherein, the second threshold voltage is less than the first threshold voltage；
The half control starting module is additionally operable to the full-bridge submodule locking that control voltage is less than the second threshold voltage.
The startup method and device for the modularization multi-level converter that above-mentioned half-bridge is mixed with full-bridge, first, control are all
Half-bridge submodule and all full-bridge submodules keep being latched, i.e., all half-bridge submodules and all full-bridge submodules are sentenced and filled
Electric process, so that all half-bridge submodules and all full-bridge submodules reach initial voltage.Secondly, all half-bridge submodules are controlled
Block keeps locking, and the working condition by controlling at least partly full-bridge submodule makes the total voltage of full-bridge submodule push the speed
Decline.In this way, the average voltage of all half-bridge submodules gradually increases, the average voltage of all full-bridge submodules also gradually increases
Greatly, and the two moves closer to, at this time the electric voltage equalization of all submodules.Then, each full-bridge submodule and fifty-fifty is controlled respectively
The working condition of bridge submodule so that the voltage of all half-bridge submodules reaches rated voltage, and makes all full-bridge submodules
Voltage reach rated voltage.In this way, in the start-up course of modularization multi-level converter, all full-bridge submodules and institute
The voltage of half-bridge submodule is slowly to increase, and the voltage of all submodules is maintained at more balanced state.Therefore, mould
The output voltage of block multilevel converter slowly increases to rated voltage, in this way can to avoid system unlock moment cause compared with
Big dash current, to improve the safety coefficient of network system.
Description of the drawings
Fig. 1 is the schematic diagram of the modularization multi-level converter of an embodiment；
Fig. 2 is the schematic diagram of the half-bridge submodule of an embodiment；
Fig. 3 is the schematic diagram that the half-bridge submodule of an embodiment bypasses；
Fig. 4 is the schematic diagram of the full-bridge submodule of an embodiment；
Fig. 5 is the schematic diagram that the full-bridge submodule half of an embodiment is latched；
Fig. 6 is the schematic diagram that the full-bridge submodule of an embodiment bypasses；
Fig. 7 is the connection diagram of the modularization multi-level converter and AC network of an embodiment；
Fig. 8 is that the flow of the startup method for the modularization multi-level converter that the half-bridge of first embodiment is mixed with full-bridge is shown
It is intended to；
Fig. 9 is that the flow of the startup method for the modularization multi-level converter that the half-bridge of second embodiment is mixed with full-bridge is shown
It is intended to；
Figure 10 is the flow of the startup method for the modularization multi-level converter that the half-bridge of 3rd embodiment is mixed with full-bridge
Schematic diagram；
Figure 11 is the structural frames of the starter for the modularization multi-level converter that the half-bridge of an embodiment is mixed with full-bridge
Figure.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Fig. 1 is the schematic diagram of the modularization multi-level converter of an embodiment.As shown in Figure 1, the modular multilevel change of current
Device includes multiple half-bridge submodules and multiple full-bridge submodules.Half-bridge submodule and full-bridge submodule are collectively referred to as submodule.Half-bridge with
The modularization multi-level converter (referred to as transverter) of full-bridge mixing includes at least one phase element.In the present embodiment, the change of current
Device includes three phase elements, respectively A phase elements, B phase elements, C phase elements.Each phase element includes upper bridge arm and lower bridge arm.
Upper bridge arm is identical as lower bridge arm structure.Upper bridge arm and lower bridge arm include at least one half-bridge submodule being serially connected, at least
One full-bridge submodule and a reactor.In the present embodiment, upper bridge arm includes a half-bridge being serially connected with lower bridge arm
Submodule, a full-bridge submodule and a reactor.In the present embodiment, transverter further includes control device (not shown).
Half-bridge submodule and full-bridge submodule are first discussed in detail below.
Fig. 2 is the schematic diagram of the half-bridge submodule of an embodiment.Half-bridge submodule includes capacitance and is in parallel with the capacitance
First switch unit.In the present embodiment, first switch unit includes the first turn-off device and the second turn-off device.First
The anode of the cathode of turn-off device and the second turn-off device, which is in series, constitutes first switch unit.First turn-off device
Anode of the anode as first switch unit, the cathode of the cathode of the second turn-off device as first switch unit.First can
The tie point of device and the second turn-off device is turned off as first end point, the cathode of first switch unit is as the second endpoint.
Half-bridge submodule accesses related circuit by first end point and the second endpoint.The working condition of half-bridge submodule includes bypass or closes
Lock.
The working condition of half-bridge submodule locking is referred to Fig. 2.The locking of half-bridge submodule refers to the first of half-bridge submodule
Turn-off device turns off, the shutdown of the second turn-off device.
Fig. 3 is the schematic diagram that the half-bridge submodule of an embodiment bypasses.As shown in figure 3, the bypass of half-bridge submodule refers to half-bridge
First turn-off device of submodule turns off, and the second turn-off device is open-minded.
Fig. 4 is the schematic diagram of the full-bridge submodule of an embodiment.Full-bridge submodule includes capacitance and is in parallel with the capacitance
Second switch unit and third switch unit.Second switch unit includes third turn-off device and the 4th turn-off device.
The anode of the cathode of third turn-off device and the 4th turn-off device is in series composition.The positive conduct of third turn-off device
The anode of second switch unit, the cathode of the cathode of the 4th turn-off device as second switch unit.Third turn-off device
Tie point with the 4th turn-off device is as third endpoint.Third switch unit, which includes the 5th turn-off device and the 6th, to close
Disconnected device.The anode of the cathode and the 6th turn-off device of 5th turn-off device is in series.The anode of 5th turn-off device
As the anode of third switch unit, the cathode of the cathode of the 6th turn-off device as third switch unit.5th can turn off
The tie point of device and the 6th turn-off device is as the 4th endpoint.Full-bridge submodule is connected by third endpoint and the 4th endpoint
To related circuit.The working condition of full-bridge submodule includes one kind in locking, half locking or bypass.
Full-bridge submodule locking refer to full-bridge submodule third and fourth, five, six turn-off devices it is all off.Full-bridge submodule
The schematic diagram of block locking can refer to Fig. 4.
Fig. 5 is the schematic diagram that the full-bridge submodule half of an embodiment is latched.As shown in figure 5, full-bridge submodule half is latched and refers to
The third turn-off device of full-bridge submodule is open-minded, the shutdown of fourth, fifth, six turn-off devices.In other embodiments, can also
It is third and fourth, the shutdown of five turn-off devices, the 6th turn-off device is open-minded.
Fig. 6 is the schematic diagram that the full-bridge submodule of an embodiment bypasses.As shown in fig. 6, the bypass of full-bridge submodule refers to complete
The third of bridge submodule, the shutdown of five turn-off devices, the four, the six turn-off devices are open-minded.Or in other embodiments,
Three, five turn-off devices are open-minded, the shutdown of the four, the six turn-off devices.
Fig. 7 is the connection diagram of the modularization multi-level converter and AC network of an embodiment.Modular multilevel
Transverter is connected to AC network by serial connection charge resistance.In the present embodiment, transverter is opened by charging resistor R and its bypass
Close QA, service entrance switch QF is connected with AC network.Wherein, charging resistor R connects with service entrance switch QF.Charging resistor R and bypass
Switch QA is in parallel.
Fig. 8 is that the flow of the startup method for the modularization multi-level converter that the half-bridge of first embodiment is mixed with full-bridge is shown
It is intended to.This method includes：
Step S120, controls all half-bridge submodules and all full-bridge submodules keep being latched, so that all half-bridges are sub
Module and all full-bridge submodules reach initial voltage.
Specifically, this step is not control startup stage.I.e. in this stage, control device controls all submodule lockings,
Close service entrance switch QF, all submodule chargings, so that all submodules have the initial voltage that can be worked.In this way, can be with
Each submodule is set to enter preparation.Charging resistor R can be to avoid the starting stage charged in AC system generates overcurrent and damages
Bad system element.When the electric current of charging resistor is less than pre-set current value, control device controls charging resistor bypass.Alternatively,
When the voltage of charging resistor is more than preset voltage value, control device controls charging resistor bypass.Due to the week in alternating current
In phase, a full-bridge submodule can continue to charge, and a half-bridge submodule can only charge in half period.Therefore, pass through
In the identical charging time, a full-bridge submodule voltage is about twice of a half-bridge submodule voltage at this time, and the two
Voltage it is all relatively low.In this way, can be that transverter is ready into next working stage.Further, pre-set current value
Can be 0.1pu.Preset voltage value can be 0.
Step S140 controls all half-bridge submodules and keeps locking, and the work by controlling at least partly full-bridge submodule
The total voltage of full-bridge submodule is set to push the speed decline as state.
Specifically, this stage is half control startup stage, i.e. control device only controls full-bridge submodule, does not have to control half-bridge
Submodule.Control device can be latched with control section full-bridge submodule half, so that these full-bridge submodules are the half of alternating current
Period charges.Or the bypass of control device control section full-bridge submodule, so that these full-bridge submodules stop charging.This
Sample, on the one hand, the charging rate of all full-bridge submodules can be reduced so that total voltage ramp-up rate declines；On the other hand,
All half-bridge submodule charging rates can be made to increase, to which voltage ramp-up rate increases.Therefore, all half-bridge submodules are flat
Equal voltage gradually increases, and all full-bridge submodule average voltages also gradually increase, but the two but moves closer to.It is final to make institute
There is the electric voltage equalization of submodule.Therefore, so that the output voltage of transverter steadily rises, and reduces the general of dash current
Rate.
Step S160 controls the working condition of each full-bridge submodule and each half-bridge submodule respectively, so that all half-bridges are sub
The voltage of module reaches rated voltage, and the voltage of all full-bridge submodules is made to reach rated voltage.
Specifically, this stage is full control startup stage, i.e. control device can control full-bridge submodule and half-bridge simultaneously
Submodule.It can be with the working condition of dynamic control each full-bridge submodule and each half-bridge submodule, with slowly by all submodules electricity
Pressure is adjusted to rated voltage, completes start-up course.
The startup method for the modularization multi-level converter that above-mentioned half-bridge is mixed with full-bridge controls all half-bridge first
Module and all full-bridge submodules keep being latched, i.e., all half-bridge submodules and all full-bridge submodules are sentenced and charged
Journey, so that all half-bridge submodules and all full-bridge submodules reach initial voltage.Secondly, all half-bridge submodules are controlled to protect
Locking is held, and the working condition by controlling at least partly full-bridge submodule makes the total voltage of full-bridge submodule push the speed down
Drop.In this way, the average voltage of all half-bridge submodules gradually increases, the average voltage of all full-bridge submodules also gradually increases,
And the two moves closer to, at this time the electric voltage equalization of all submodules.Then, each full-bridge submodule and each half-bridge are controlled respectively
The working condition of module so that the voltage of all half-bridge submodules reaches rated voltage, and makes the electricity of all full-bridge submodules
Pressure reaches rated voltage.In this way, in the start-up course of modularization multi-level converter, all full-bridge submodules and all half
The voltage of bridge submodule is slowly to increase, and the voltage of all submodules is maintained at more balanced state.Therefore, modularization
The output voltage of multilevel converter slowly increases to rated voltage, in this way can be larger to avoid being caused in system unlock moment
Dash current, to improve the safety coefficient of network system.
Fig. 9 is that the flow of the startup method for the modularization multi-level converter that the half-bridge of second embodiment is mixed with full-bridge is shown
It is intended to.It controls all half-bridge submodules and keeps locking, and the working condition by controlling at least partly full-bridge submodule makes full-bridge
The total voltage of submodule is pushed the speed before the step of declining, i.e. includes before step S140：
Whether step S130, the voltage for detecting each full-bridge submodule reach the operation threshold of self-energizing power supply.If each complete
The voltage of bridge submodule reaches the operation threshold of self-energizing power supply, thens follow the steps S140.If the voltage of each full-bridge submodule
The not up to operation threshold of self-energizing power supply then continues to execute step S130.
Specifically, whether the voltage of each full-bridge submodule, which reaches the operation threshold of self-energizing power supply, means each full-bridge submodule
Whether block can work normally.When the voltage of each full-bridge submodule reaches the operation threshold of self-energizing power supply, it is meant that each complete
Bridge submodule can voluntarily trigger work.Otherwise, voltage is not up to the full-bridge submodule of operation threshold and also needs to continue to charge.
It controls all half-bridge submodules and keeps locking, and the working condition by controlling at least partly full-bridge submodule makes entirely
The total voltage of bridge submodule is pushed the speed before the step of declining, i.e. step S140 includes：
When the voltage of each full-bridge submodule reaches the operation threshold of self-energizing power supply, S141 is thened follow the steps, controls institute
There is half-bridge submodule to keep locking.
Specifically, at this point, the voltage of each half-bridge submodule is respectively less than the voltage of any full-bridge submodule.This step controls
Equipment makes half-bridge submodule continue to charge.
Step S142, control voltage are bypassed not less than the full-bridge submodule of first threshold voltage.
Specifically, full-bridge submodule bypass of the control device control voltage not less than first threshold voltage can make these
Full-bridge submodule neither charges nor discharges.In this way, under same AC network, it is possible to reduce while the full-bridge submodule of charging
The quantity of the number of block, the half-bridge submodule of charging is constant, therefore the rate of voltage rise of each half-bridge submodule is accelerated, that is, makes
The charging rate of each half-bridge submodule is accelerated.
Step S143, control voltage are in second threshold voltage to the full-bridge submodule semi-closure between first threshold voltage
Lock.
Specifically, second threshold voltage is less than first threshold voltage.Control device control voltage is in second threshold voltage
It is latched to the full-bridge submodule between first threshold voltage half, full-bridge submodule can be made to be equal to half-bridge submodule, a side
These full-bridge submodule voltages of face are smaller, can continue to charge, but charging rate reduces.It on the other hand, can also be further
So that the charging rate of each half-bridge submodule increases.
Step S144, the full-bridge submodule that control voltage is less than second threshold voltage are latched.
Specifically, the voltage for the full-bridge submodule that control device control voltage is less than second threshold voltage is smaller, makes these
Full-bridge submodule is latched, even if the continuation of these full-bridge submodules is charged with normal speed.
Through the above steps, control device can make the whole charging rate of all full-bridge submodules reduce so that
The whole charging rate of all half-bridge submodules is promoted.The average voltage of all half-bridge submodules gradually increases.All full-bridge
The average voltage of module also gradually increases.But the increased speed of average voltage of all half-bridge submodules is more than all full-bridges
The average voltage of module is pushed the speed.The average voltage of the average voltage and full-bridge submodule of final half-bridge submodule tends to one
It causes, i.e. the average voltage of half-bridge submodule and the average voltage of full-bridge submodule can be equal or approximately equal.In this way, transverter
In the voltage of all submodules progressively reach equilibrium state, the voltage of final all submodules all reaches the work of self-energizing power supply
Threshold value reduces the design difficulty of the self-energizing power supply of each submodule.In addition, the voltage of transverter slowly rises, can effectively keep away
Exempt from dash current.
Figure 10 is the flow of the startup method for the modularization multi-level converter that the half-bridge of 3rd embodiment is mixed with full-bridge
Schematic diagram.In the present embodiment, controls all half-bridge submodules and keep locking, and the work by controlling at least partly full-bridge submodule
As state make the total voltage of full-bridge submodule push the speed decline the step of after, i.e. include after step S140：
Step S151 judges the ratio of the average voltage of all half-bridge submodules and the average voltage of all full-bridge submodules
Whether preset multiple is more than.
Step S153 is big in the ratio of the average voltage and the average voltage of all full-bridge submodules of all half-bridge submodules
It when preset multiple, controls all full-bridge submodules half and is latched, control all half-bridge submodule lockings.
In this way, control device can make all full-bridge submodules be equivalent to half-bridge submodule, i.e., all sons in transverter
Module is half-bridge submodule.At this moment, the sub-module types in transverter can be made single, facilitates control device control.Tool
Body, preset multiple can be in the range of 0.6 to 1.4.In this way, the average voltage of all half-bridge submodules and all full-bridges
The average voltage of module is roughly equal.That is the voltage of transverter reaches equilibrium state, and the voltage of transverter remains flat
The growth of weighing apparatus.
In the present embodiment, the working condition of each full-bridge submodule and each half-bridge submodule is controlled respectively, so that all half-bridges
The step of total voltage of submodule and all full-bridge submodules reaches rated voltage, i.e. step S160 include：
Step S161, control voltage are bypassed not less than the full-bridge submodule of third threshold voltage, and are controlled voltage and be not less than
The half-bridge submodule of third threshold voltage bypasses.
Specifically, when the voltage of transverter is close to rated voltage, higher full-bridge of control device control section voltage
Module stops charging, that is, is in bypass condition.Voltage higher half-bridge submodule in control device control section stops charging, that is, locates
In bypass condition.In this way, continuing to reduce the rate of voltage rise of all submodules, so that the total voltage of all submodules is slow
Close to rated voltage.To avoid transverter larger dash current is caused in unlock moment.
Figure 11 is the structural frames of the starter for the modularization multi-level converter that the half-bridge of an embodiment is mixed with full-bridge
Figure.A kind of starter for the modularization multi-level converter that half-bridge is mixed with full-bridge, modularization multi-level converter include more
A half-bridge submodule and multiple full-bridge submodules, modularization multi-level converter are connected to alternating current by serial connection charge resistance
Net.The device includes：
Starting module 120 is not controlled, keeps being latched for controlling all half-bridge submodules and all full-bridge submodules, so that
All half-bridge submodules and all full-bridge submodules reach initial voltage；
Half control starting module 140 keeps locking for controlling all half-bridge submodules, and by controlling at least partly full-bridge
The working condition of submodule makes the total voltage of full-bridge submodule push the speed decline；Wherein, the working condition packet of full-bridge submodule
Include one kind in locking, half locking or bypass；
Full control starting module 160, the working condition for controlling each full-bridge submodule and each half-bridge submodule respectively, so that
The voltage of all half-bridge submodules reaches rated voltage, and the voltage of all full-bridge submodules is made to reach rated voltage；Its
In, the working condition of half-bridge submodule includes bypass or locking.
The starter for the modularization multi-level converter that above-mentioned half-bridge is mixed with full-bridge controls all half-bridge first
Module and all full-bridge submodules keep being latched, i.e., all half-bridge submodules and all full-bridge submodules are sentenced and charged
Journey, so that all half-bridge submodules and all full-bridge submodules reach initial voltage.Secondly, all half-bridge submodules are controlled to protect
Locking is held, and the working condition by controlling at least partly full-bridge submodule makes the total voltage of full-bridge submodule push the speed down
Drop.In this way, the average voltage of all half-bridge submodules gradually increases, the average voltage of all full-bridge submodules also gradually increases,
And the two moves closer to, at this time the electric voltage equalization of all submodules.Then, each full-bridge submodule and each half-bridge are controlled respectively
The working condition of module so that the voltage of all half-bridge submodules reaches rated voltage, and makes the electricity of all full-bridge submodules
Pressure reaches rated voltage.In this way, in the start-up course of modularization multi-level converter, all full-bridge submodules and all half
The voltage of bridge submodule is slowly to increase, and the voltage of all submodules is maintained at more balanced state.Therefore, modularization
The output voltage of multilevel converter slowly increases to rated voltage, in this way can be larger to avoid being caused in system unlock moment
Dash current, to improve the safety coefficient of network system.
Half control starting module 140 is used to reach self-energizing in the voltage of each full-bridge submodule in one of the embodiments,
When the operation threshold of power supply, controls all half-bridge submodules and keep locking；
Half control starting module 140 is additionally operable to control voltage and is bypassed not less than the full-bridge submodule of first threshold voltage；
Half control starting module 140 is additionally operable to control voltage and is in second threshold voltage to the full-bridge between first threshold voltage
Submodule half is latched；Wherein, second threshold voltage is less than first threshold voltage；
Half control starting module 140 is additionally operable to the full-bridge submodule locking that control voltage is less than second threshold voltage.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of startup method for the modularization multi-level converter that half-bridge is mixed with full-bridge, which is characterized in that the modularization
Multilevel converter includes multiple half-bridge submodules and multiple full-bridge submodules, the method includes：
Control the multiple half-bridge submodule and the multiple full-bridge submodule keep being latched so that all half-bridge submodules and
All full-bridge submodules reach respective initial voltage；
It controls the multiple half-bridge submodule and keeps locking, and the working condition by controlling at least partly full-bridge submodule makes institute
There is the total voltage of full-bridge submodule to push the speed decline；Wherein, the working condition of the full-bridge submodule includes locking, half locking
Or one kind in bypass；
The working condition of each full-bridge submodule and each half-bridge submodule is controlled respectively, so that the voltage of all half-bridge submodules and institute
There is the voltage of full-bridge submodule to reach rated voltage；Wherein, the working condition of the half-bridge submodule includes bypass or locking.
2. according to the method described in claim 1, it is characterized in that, the modularization multi-level converter passes through serial connection charge electricity
Resistance is connected to AC network.
3. according to the method described in claim 2, it is characterized in that, described make all half-bridge submodules keep locking, and passing through
Control at least partly full-bridge submodule working condition make the total voltage of full-bridge submodule push the speed decline the step of before wrap
It includes：
When the electric current of the charging resistor is less than pre-set current value, the charging resistor bypass is controlled.
4. according to the method described in claim 2, it is characterized in that, described make all half-bridge submodules keep locking, and passing through
Control at least partly full-bridge submodule working condition make the total voltage of full-bridge submodule push the speed decline the step of before wrap
It includes：
When the voltage of the charging resistor is more than preset voltage value, the charging resistor bypass is controlled.
5. according to the method described in claim 1, it is characterized in that, described make all half-bridge submodules keep locking, and passing through
Control at least partly full-bridge submodule working condition make the total voltage of full-bridge submodule push the speed decline the step of include：
When the voltage of each full-bridge submodule reaches the operation threshold of self-energizing power supply, controls all half-bridge submodule holdings and close
Lock；
The full-bridge submodule that voltage is controlled not less than first threshold voltage bypasses；
Control voltage is in second threshold voltage to the full-bridge submodule between the first threshold voltage half and is latched；Wherein, institute
It states second threshold voltage and is less than the first threshold voltage；
Control the full-bridge submodule locking that voltage is less than the second threshold voltage.
6. according to the method described in claim 1, it is characterized in that, described make all half-bridge submodules keep locking, and passing through
Control at least partly full-bridge submodule working condition make the total voltage of full-bridge submodule push the speed decline the step of after wrap
It includes：
When the ratio of the average voltage of the average voltage and all full-bridge submodules of all half-bridge submodules is more than preset multiple,
It controls all full-bridge submodules half to be latched, controls all half-bridge submodule lockings.
7. according to the method described in claim 6, it is characterized in that, the preset multiple is in the range of 0.6 to 1.4.
8. according to the method described in claim 1, it is characterized in that, described control each full-bridge submodule and each half-bridge submodule respectively
The working condition of block, so that the total voltage of all half-bridge submodules and all full-bridge submodules is wrapped the step of reaching rated voltage
It includes：
The full-bridge submodule that voltage is controlled not less than third threshold voltage bypasses, and controls voltage not less than third threshold voltage
Half-bridge submodule bypasses.
9. a kind of starter for the modularization multi-level converter that half-bridge is mixed with full-bridge, which is characterized in that the modularization
Multilevel converter includes multiple half-bridge submodules and multiple full-bridge submodules, and the modularization multi-level converter passes through series connection
Charging resistor is connected to AC network, and described device includes：
Starting module is not controlled, keeps being latched for controlling all half-bridge submodules and all full-bridge submodules, so that all half
Bridge submodule and all full-bridge submodules reach initial voltage；
Half control starting module keeps locking for controlling all half-bridge submodules, and by controlling at least partly full-bridge submodule
Working condition so that the total voltage of full-bridge submodule is pushed the speed decline；Wherein, the working condition of the full-bridge submodule includes
One kind in locking, half locking or bypass；
Full control starting module, the working condition for controlling each full-bridge submodule and each half-bridge submodule respectively, so that all half
The voltage of bridge submodule reaches rated voltage, and the voltage of all full-bridge submodules is made to reach rated voltage；Wherein, described
The working condition of half-bridge submodule includes bypass or locking.
10. device according to claim 9, which is characterized in that the half control starting module is used in each full-bridge submodule
Voltage when reaching the operation threshold of self-energizing power supply, control all half-bridge submodules and keep locking；
The half control starting module is additionally operable to control voltage and is bypassed not less than the full-bridge submodule of first threshold voltage；
The half control starting module is additionally operable to control voltage and is in second threshold voltage to complete between the first threshold voltage
Bridge submodule half is latched；Wherein, the second threshold voltage is less than the first threshold voltage；
The half control starting module is additionally operable to the full-bridge submodule locking that control voltage is less than the second threshold voltage.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810395466.4A CN108471251B (en) | 2018-04-27 | 2018-04-27 | starting method and device of half-bridge and full-bridge mixed modular multilevel converter |
| JP2020551422A JP7125504B2 (en) | 2018-04-27 | 2018-08-23 | Start-up method and apparatus for modular multi-level converter in which half-bridge and full-bridge coexist |
| PCT/CN2018/101987 WO2019205368A1 (en) | 2018-04-27 | 2018-08-23 | Method and device for starting half bridge-full bridge hybrid modular multilevel converter |
| KR1020207028332A KR102440726B1 (en) | 2018-04-27 | 2018-08-23 | Method and apparatus for starting a modular multilevel converter in which half-bridge and full-bridge are mixed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810395466.4A CN108471251B (en) | 2018-04-27 | 2018-04-27 | starting method and device of half-bridge and full-bridge mixed modular multilevel converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108471251A true CN108471251A (en) | 2018-08-31 |
| CN108471251B CN108471251B (en) | 2019-12-06 |
Family
ID=63263720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810395466.4A Active CN108471251B (en) | 2018-04-27 | 2018-04-27 | starting method and device of half-bridge and full-bridge mixed modular multilevel converter |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7125504B2 (en) |
| KR (1) | KR102440726B1 (en) |
| CN (1) | CN108471251B (en) |
| WO (1) | WO2019205368A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103486A (en) * | 2019-12-23 | 2020-05-05 | 国家电网有限公司 | Flexible direct current converter valve submodule type identification method and valve base controller |
| WO2022022459A1 (en) * | 2020-07-31 | 2022-02-03 | 南京南瑞继保电气有限公司 | Charging control method and device for hybrid converter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4162599A1 (en) * | 2020-07-24 | 2023-04-12 | Siemens Energy Global GmbH & Co. KG | Assembly and method for operating same |
| EP4162598A1 (en) * | 2020-07-24 | 2023-04-12 | Siemens Energy Global GmbH & Co. KG | Converter and method for operating same |
| JP7143548B1 (en) * | 2021-10-20 | 2022-09-28 | 東芝三菱電機産業システム株式会社 | power converter |
| WO2024091083A1 (en) * | 2022-10-27 | 2024-05-02 | 에이치디한국조선해양 주식회사 | Modular multilevel converter and power system using same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2408081A1 (en) * | 2010-07-16 | 2012-01-18 | ABB Technology AG | Modular multi-level converter |
| WO2015090428A1 (en) * | 2013-12-19 | 2015-06-25 | Abb Technology Ltd | Method and system for handling converter cell failure |
| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN107317472A (en) * | 2017-06-30 | 2017-11-03 | 中国西电电气股份有限公司 | A kind of full-bridge starts method with half-bridge mixed type module multilevel converter |
| CN107453635A (en) * | 2017-09-01 | 2017-12-08 | 东南大学 | A kind of hybrid modular multi-level converter topological structure of n+1 and its control strategy |
| 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 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002354830A (en) * | 2001-05-25 | 2002-12-06 | Toshiba Corp | High voltage inverter device |
| JP2007189873A (en) * | 2006-01-16 | 2007-07-26 | Tokushu Denso Kk | Inrush current protection circuit |
| JP5971685B2 (en) * | 2012-02-20 | 2016-08-17 | 株式会社東芝 | Power converter |
| EP3086459B1 (en) * | 2013-12-16 | 2022-09-14 | Mitsubishi Electric Corporation | Power conversion device |
| KR101629397B1 (en) * | 2015-12-03 | 2016-06-13 | 연세대학교 산학협력단 | Apparatus and Method for Controlling of Asymmetric Modular Multilevel Converter |
| EP3439158B1 (en) * | 2016-03-28 | 2022-06-22 | Mitsubishi Electric Corporation | Power conversion device |
-
2018
- 2018-04-27 CN CN201810395466.4A patent/CN108471251B/en active Active
- 2018-08-23 WO PCT/CN2018/101987 patent/WO2019205368A1/en active Application Filing
- 2018-08-23 KR KR1020207028332A patent/KR102440726B1/en active IP Right Grant
- 2018-08-23 JP JP2020551422A patent/JP7125504B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2408081A1 (en) * | 2010-07-16 | 2012-01-18 | ABB Technology AG | Modular multi-level converter |
| WO2015090428A1 (en) * | 2013-12-19 | 2015-06-25 | Abb Technology Ltd | Method and system for handling converter cell failure |
| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN107317472A (en) * | 2017-06-30 | 2017-11-03 | 中国西电电气股份有限公司 | A kind of full-bridge starts method with half-bridge mixed type module multilevel converter |
| CN107453635A (en) * | 2017-09-01 | 2017-12-08 | 东南大学 | A kind of hybrid modular multi-level converter topological structure of n+1 and its control strategy |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103486A (en) * | 2019-12-23 | 2020-05-05 | 国家电网有限公司 | Flexible direct current converter valve submodule type identification method and valve base controller |
| CN111103486B (en) * | 2019-12-23 | 2022-05-20 | 国家电网有限公司 | Flexible direct current converter valve submodule type identification method and valve base controller |
| WO2022022459A1 (en) * | 2020-07-31 | 2022-02-03 | 南京南瑞继保电气有限公司 | Charging control method and device for hybrid converter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7125504B2 (en) | 2022-08-24 |
| WO2019205368A1 (en) | 2019-10-31 |
| CN108471251B (en) | 2019-12-06 |
| KR102440726B1 (en) | 2022-09-06 |
| KR20200125988A (en) | 2020-11-05 |
| JP2021516946A (en) | 2021-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108471251A (en) | The startup method and device for the modularization multi-level converter that half-bridge is mixed with full-bridge | |
| US9608511B2 (en) | Method for charging modular multilevel converter | |
| US10483871B2 (en) | Power conversion apparatus and power system | |
| US8860380B2 (en) | Method for energizing a chain-link converter, controller, computer programs and computer program products | |
| RU2706020C1 (en) | Output method of high-voltage direct current switch | |
| CN104094494B (en) | Accumulating system in parallel and control method thereof | |
| CN113872425A (en) | Control of voltage source converter | |
| KR102467807B1 (en) | DC power switching assembly and method | |
| CN107765112B (en) | Converter valve overcurrent turn-off test circuit, method and device | |
| US20190173393A1 (en) | Voltage balancing of voltage source converters | |
| CN103548266B (en) | Method and apparatus for operating a power output stage | |
| CN104170236A (en) | A converter cell and associated converter arm and method | |
| WO2013013869A1 (en) | Energy storage device, system having an energy storage device, and method for operating an energy storage device | |
| CN112865577B (en) | Pre-charging circuit of hybrid multi-level converter (HCC) and control method thereof | |
| GB2489262A (en) | Testing apparatus for testing a switching valve in an HVDC power converter | |
| CN111638419B (en) | Flexible direct-current black module test method and device | |
| CN105680681B (en) | The startup method of modularization multi-level converter based on clamp formula form sub-module | |
| US20220045624A1 (en) | Power Converter and Power Conversion System | |
| CN113138351B (en) | Modular multilevel converter capacitor monitoring method based on sub-module input time | |
| CN114586267B (en) | Transformer apparatus | |
| Hu et al. | Commutation failure analysis considering direct current dynamics in LCC-HVDC systems | |
| EP3331144A1 (en) | Improvements in or relating to hvdc power converters | |
| CN114062917A (en) | Bypass switch high-frequency withstand voltage test circuit, method and device | |
| WO2020038704A1 (en) | Switching valve | |
| CN114094833B (en) | Switch capacitor access type direct current transformer and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200923 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
|
| TR01 | Transfer of patent right |