CN106849718B - One seed module topology and a kind of MMC inverter - Google Patents
One seed module topology and a kind of MMC inverter Download PDFInfo
- Publication number
- CN106849718B CN106849718B CN201710087627.9A CN201710087627A CN106849718B CN 106849718 B CN106849718 B CN 106849718B CN 201710087627 A CN201710087627 A CN 201710087627A CN 106849718 B CN106849718 B CN 106849718B
- Authority
- CN
- China
- Prior art keywords
- switch module
- capacitor
- anode
- cathode
- unit
- 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.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 98
- 230000005611 electricity Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000000903 blocking effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Abstract
The present invention relates to seed module topology and a kind of MMC inverters, at least one submodule is made of 6 switch modules and 4 capacitors in the MMC inverter, first, the submodule topology, which can be realized to be passed through by closedown mode progress DC Line Fault and carried out DC Line Fault in a manner of non-blocked, passes through two ways, therefore, for the submodule when DC Line Fault occurs, fault traversing reliability is higher, according to practical control can need that corresponding DC Line Fault is selected to pass through mode.Moreover, under same voltage class, i.e., under same level number, compared with full-bridge submodule, the number of the switching device needed is less, can be effectively reduced the cost of DC transmission engineering, and, voltage class is higher, and when output level number is higher, the number of the switching device of saving is more.
Description
Technical field
The present invention relates to seed module topology and a kind of MMC inverters.
Background technique
With the application of the development of all-controlling power electronics device and power electronic technique in the power system, it is based on voltage
The flexible DC transmission technology of source inverter is paid more and more attention.Modularization multi-level converter (Modular multilevel
Converter, MMC) be flexible HVDC transmission system application in voltage source converter one kind, it is by multiple submodule according to one
Fixed mode is formed by connecting, the alternating current for exporting inverter by the investment and excision state that control each submodule IGBT group
Nearly sine wave is oppressed, realizes the high efficiency of transmission of energy.
In traditional modularization multi-level converter, semibridge system submodule is generallyd use as basic unit, is changed with reducing
Flow device construction cost.Traditional semibridge system submodule MMC can not be pressed down rapidly when direct-current short circuit failure occurs by self-characteristic
Fault current processed, it is necessary to could understand fault current by AC circuit breaker or dc circuit breaker.On the one hand due to alternating current interruption
The response time of device is longer, it is possible to protection be caused to cause inverter overcurrent damage not in time；Another aspect configuring direct current is disconnected
Road device improves the technical requirements to equipment, increases system cost.
In order to solve this problem, scholar proposes have DC Line Fault using full-bridge submodule, clamp Shuangzi module etc.
The novel submodule topology of ride-through capability substitutes half-bridge submodule.By being latched inverter rapidly after failure, full-bridge submodule is utilized
The reverse blocking capability of diode inhibits rapidly fault current in the topology such as block, realizes the self-cleaning of DC Line Fault.But it uses and closes
The mode of lock inverter is passed through, and will cause exchange side off-grid, AC circuit breaker tripping, is unfavorable for the extensive of ability to transmit electricity after failure
It is multiple.Although maintaining to hand over moreover, the ability of negative level can also be generated using full-bridge submodule when using full-bridge submodule
DC voltage is reduced to 0 in the case that stream side is grid-connected, to inhibit fault current, realizes the direct current event under not blocking
Barrier passes through；But under certain DC voltage level, for example the level number of MMC is N+1, then N number of full-bridge submodule is just needed,
Since there are four switching devices in each full-bridge submodule, then needing switching device number altogether is 4N.Since switching device exists
Inherently occupy larger specific gravity in flexible DC transmission engineering cost, so if not being latched direct current using the realization of full-bridge submodule
Fault traversing, the higher cost for needing to put into, is not appropriate for practical engineering application.Therefore, it is highly desirable to propose a kind of novel
MMC submodule topology makes MMC have both locking and passes through function with DC Line Fault is not latched, and has certain cost advantage.
Summary of the invention
The object of the present invention is to provide seed module topologys, although can be realized solving full-bridge submodule and are not latched
DC Line Fault passes through, but the higher problem of input cost.Present invention simultaneously provides a kind of MMC inverters.
To achieve the above object, the solution of the present invention includes seed module topology, including first unit and second unit,
The first unit and second unit are made of a switching branches and a capacitive branch parallel connection, are gone here and there in the switching branches
If going here and there capacitor there are two setting there are two switch module, on the capacitive branch；Switching branches and capacitive branch in first unit
One of tie point and the switching branches in second unit and one of tie point of capacitive branch between be connected with out
Module T5 is closed, is connected between the tie point of two capacitors in the tie point and second unit of two capacitors in first unit
Switch module T6, the tie point of two switch modules in the tie point and second unit of two switch modules in first unit
For the input/output terminal of the submodule topology.
Two switch modules in the first unit are respectively switch module T1 and T2, two capacitors in first unit
Module is respectively capacitor C1 and C2, and two switch modules in second unit are respectively switch module T3 and T4, in second unit
Two capacitance modules be respectively capacitor C3 and C4；The anode of the anode connection capacitor C1 of switch module T1, switch module T1's
The anode of cathode connection switch module T2, the cathode of the cathode connection capacitor C2 of switch module T2；The anode of switch module T3 connects
The anode of capacitor C3 is connect, the cathode of the anode of the cathode connection switch module T4 of switch module T3, switch module T4 connects capacitor
The cathode of C4；The cathode of tie point connection switch module T5 between the cathode of switch module T2 and the cathode of capacitor C2, switch
The anode of tie point connection switch module T5 between the anode of module T3 and the anode of capacitor C3；The cathode and capacitor of capacitor C1
The anode of tie point connection switch module T6 between the anode of C2, the connection between the cathode of capacitor C3 and the anode of capacitor C4
The cathode of point connection switch module T6.
Each switch module is made of switching device and diode reverse parallel connection.
A kind of MMC inverter, including 3 phases, every phase are made of upper and lower two bridge arms, and each bridge arm is by n sub-module cascade
It constitutes, it includes first unit and second unit that the MMC inverter, which has at least one submodule, and the first unit and second is singly
Member is made of a switching branches and a capacitive branch parallel connection, and string is set there are two switch module in the switching branches, institute
It states on capacitive branch string and sets that there are two capacitors；One of tie point of switching branches and capacitive branch in first unit and
Switch module T5 is connected between one of tie point of switching branches and capacitive branch in Unit two, in first unit
Switch module T6 is connected between the tie point of two capacitors in the tie point and second unit of two capacitors, in first unit
Two switch modules tie point and second unit in the tie points of two switch modules be the defeated of submodule topology
Enter output end.
Two switch modules in the first unit are respectively switch module T1 and T2, two capacitors in first unit
Module is respectively capacitor C1 and C2, and two switch modules in second unit are respectively switch module T3 and T4, in second unit
Two capacitance modules be respectively capacitor C3 and C4；The anode of the anode connection capacitor C1 of switch module T1, switch module T1's
The anode of cathode connection switch module T2, the cathode of the cathode connection capacitor C2 of switch module T2；The anode of switch module T3 connects
The anode of capacitor C3 is connect, the cathode of the anode of the cathode connection switch module T4 of switch module T3, switch module T4 connects capacitor
The cathode of C4；The cathode of tie point connection switch module T5 between the cathode of switch module T2 and the cathode of capacitor C2, switch
The anode of tie point connection switch module T5 between the anode of module T3 and the anode of capacitor C3；The cathode and capacitor of capacitor C1
The anode of tie point connection switch module T6 between the anode of C2, the connection between the cathode of capacitor C3 and the anode of capacitor C4
The cathode of point connection switch module T6.
Each switch module is made of switching device and diode reverse parallel connection.
Firstly, being realized by the driving signal for the wholly-controled device being latched in submodule topology provided by the invention to be latched
Mode carries out DC Line Fault and passes through；Moreover, because the submodule has the ability of output negative voltage, after DC Line Fault generation,
DC voltage can be overturn for negative value to inhibit fault current, after fault current close to after 0, control DC voltage is 0, entirely
Maintain alternating voltage constant in the process, so, which can also be carried out DC Line Fault in a manner of non-blocked and passed through.Cause
This, for the submodule when DC Line Fault occurs, fault traversing reliability is higher, selection can be needed corresponding straight according to practical control
Flow fault traversing mode.
Moreover, under that is, same level number, for example level number is the full-bridge submodule MMC of N+1 under same voltage class
In, it needs to be N number of comprising full-bridge submodule, then needing switching device number altogether is 4N；And it is based on submodule provided by the invention
MMC in, since the ceiling voltage of submodule output is twice of full-bridge submodule maximum output voltage, in level
Number is in the MMC of N+1, and N/2 submodule, which only need to be arranged, to meet the requirements, then needing switching device number altogether is 6*N/2=3N
It is a.Since switching device occupies larger specific gravity in DC transmission engineering cost, submodule topology provided by the invention with
Full-bridge submodule is compared, and under same require, the number of the switching device needed is less, can be effectively reduced direct current transportation work
The cost of journey, also, voltage class is higher, and when output level number is higher, the number of the switching device of saving is more.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of MMC inverter；
Fig. 2 is submodule topological diagram provided by the invention；
Fig. 3-a to 3-h is eight kinds of working state schematic representations of submodule provided by the invention；
Fig. 4 is the working state schematic representation under submodule one of which non-blocking mode provided by the invention；
Fig. 5 is not to be latched DC Line Fault to pass through schematic illustration；
Fig. 6 is submodule basic framework schematic diagram；
Fig. 7 is the topological diagram of submodule another embodiment.
Specific embodiment
MMC inverter embodiment
As shown in Figure 1, conventional MMC inverter includes 3 phase of a, b, c, every phase is made of upper and lower two bridge arms, Mei Geqiao
Arm is made of n sub-module cascade.It is provided by the invention new for having at least one submodule in submodule in the MMC inverter
The specific number of the novel submodule is arranged in type submodule according to actual needs.
Since MMC inverter belongs to routine techniques, inventive point of the invention is the specific structure of submodule, so, with
Under the submodule is specifically described.
As shown in Fig. 2, the submodule topology includes 6 switch module T1~T6 and 4 capacitor C1~C4.Wherein, it switchs
Module is total pressure switch module, each switch module by full-controlled switch device (such as IGBT) and corresponding diode reversely simultaneously
Connection is constituted.Capacitor C1~C4 is half voltage capacitance, and voltage of each capacitor when operating normally is the half of voltage rating, setting electricity
Appearance voltage is Uc, voltage rating Uc_rated, then Uc_rated=2*Uc.
The submodule integrally includes three parts, wherein
First part and second part are the circuits being made of a switching branches and a capacitive branch parallel connection, first
String is equipped with switch module T1 and T2 in switching branches in part, on the capacitive branch in first part string be equipped with capacitor C1 and
C2, string is equipped with switch module T3 and T4 in the switching branches in second part, and string is equipped with electricity on the capacitive branch in second part
Hold C3 and C4.The anode of the anode connection capacitor C1 of switch module T1, the sun of the cathode connection switch module T2 of switch module T1
Pole, the cathode of the cathode connection capacitor C2 of switch module T2；The anode of the anode connection capacitor C3 of switch module T3, switch module
The anode of the cathode connection switch module T4 of T3, the cathode of the cathode connection capacitor C4 of switch module T4.
Part III includes switch module T5 and T6, the tie point between the cathode of switch module T2 and the cathode of capacitor C2
The cathode of connection switch module T5, the tie point connection switch module T5 between the anode of switch module T3 and the anode of capacitor C3
Anode；The anode of tie point connection switch module T6 between the cathode of capacitor C1 and the anode of capacitor C2, capacitor C3's is negative
The cathode of tie point connection switch module T6 between pole and the anode of capacitor C4.
Tie point between the cathode of switch module T1 and the anode of switch module T2 draws one end of the submodule, switch
Tie point between the cathode of module T3 and the anode of switch module T4 draws the other end of the submodule.
Anode in above-mentioned each switch module is the anode of corresponding full-controlled switch device, i.e. full-controlled switch device
One end that electric current flows into；Cathode in each switch module is the cathode of corresponding full-controlled switch device, i.e. full-controlled switch device
One end of the electric current outflow of part.Such as: for the orientation of Fig. 2, the anode of switch module T1 is to control entirely in switch module T1
The anode of type switching device, the i.e. upper end of switch module T1, the cathode of switch module T1 are full-controlled switch in switch module T1
The cathode of device, the i.e. lower end of switch module T1.
In above-mentioned 6 switch modules in pairs, switch module T1 and T2 are one group, and switch module T3 and T4 are one group,
Switch module T5 and T6 are one group, and the full-controlled switch device in two switch modules in each group cannot simultaneously turn on, such as:
When wholly-controled device in switch module T1 is connected, the wholly-controled device in switch module T2 must be turned off.According to mentioned above principle,
The submodule includes following 8 kinds of operating statuses, wherein the flow direction of electric current described in Fig. 3-a to 3-h and Fig. 4 is being set to electric current just
To then, the opposite direction of current direction described in Fig. 3 and Fig. 4 is that electric current is reversed:
1) as shown in Fig. 3-a, switch module T1, T4, T5 conducting, the shutdown of rest switch module.It, should when electric current is positive
Operating status is non-blocking mode, realizes that bridge arm current flows through this 4 half piezoelectricity using the diode in switch module T1, T4, T5
Hold；When electric current is reversed, realize that bridge arm current flows through this 4 using the full-controlled switch device in switch module T1, T4, T5
Half voltage capacitance.Under this operating status, the output voltage of the submodule is 4Uc, i.e. 2Uc_rated.
2) as shown in Fig. 3-b, switch module T2, T4, T5 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through the full-controlled switch device in switch module T2, the diode in switch module T5, capacitor C3 and C4, opens
Close the diode in module T4；When electric current is reversed, bridge arm current flows successively through the full-controlled switch device in switch module T4
Part, capacitor C3 and C4, the full-controlled switch device in switch module T5, the diode in switch module T2.This operating status
Under, submodule output voltage is 2Uc, i.e. Uc_rated.
3) as shown in Fig. 3-c, switch module T1, T3, T5 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through diode, capacitor C1 and C2, the diode in switch module T5, switch module T3 in switch module T1
In full-controlled switch device；When electric current is reversed, bridge arm current flows successively through diode, switching molding in switch module T3
The full-controlled switch device in full-controlled switch device, capacitor C1 and C2, switch module T1 in block T5.This operating status
Under, submodule output voltage is 2Uc, i.e. Uc_rated.
4) as shown in Fig. 3-d, switch module T2, T3, T5 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through the full-controlled switch device in switch module T2, the diode in switch module T5, in switch module T3
Full-controlled switch device；When electric current is reversed, bridge arm current flows successively through diode, switch module in switch module T3
The diode in full-controlled switch device, switch module T2 in T5.Under this operating status, bridge arm current without flow through capacitor,
Submodule output voltage is 0.
5) as shown in Fig. 3-e, switch module T1, T4, T6 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through diode, capacitor C1, the full-controlled switch device in switch module T6, capacitor in switch module T1
Diode in C4, switch module T4；When electric current is reversed, the full-control type that bridge arm current flows successively through in switch module T4 is opened
Close device, capacitor C4, the diode in switch module T6, capacitor C1, the full-controlled switch device in switch module T1.This fortune
Under row state, submodule output voltage is 2Uc, i.e. Uc_rated.
6) as shown in Fig. 3-f, switch module T2, T4, T6 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through full-controlled switch device in switch module T2, capacitor C2, the full-controlled switch device in switch module T6
Part, capacitor C4, the diode in switch module T4；When electric current is reversed, bridge arm current is flowed successively through in switch module T4
Full-controlled switch device, capacitor C4, the diode in switch module T6, capacitor C2, the diode in switch module T2.This fortune
Under row state, submodule output voltage is 0.
7) as shown in Fig. 3-g, switch module T1, T3, T6 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through diode, capacitor C1, the full-controlled switch device in switch module T6, capacitor in switch module T1
Full-controlled switch device in C3, switch module T3；When electric current is reversed, bridge arm current is flowed successively through in switch module T3
Diode, capacitor C3, the diode in switch module T6, capacitor C1, the full-controlled switch device in switch module T1.This fortune
Under row state, submodule output voltage is 0.
8) as shown in Fig. 3-h, switch module T2, T3, T6 conducting, the shutdown of rest switch module.When electric current is positive, bridge
Arm electric current flows successively through full-controlled switch device in switch module T2, capacitor C2, the full-controlled switch device in switch module T6
Part, capacitor C3, the full-controlled switch device in switch module T3；When electric current is reversed, bridge arm current flows successively through switching molding
Diode, capacitor C3 in block T3, the diode in switch module T6, capacitor C2, the diode in switch module T2.This fortune
Under row state, submodule output voltage is -2Uc, i.e.-Uc_rated.
It can be seen that the submodule can export 4 voltage class by above-mentioned 8 kinds of operating statuses, be specified twice respectively
Voltage 2Uc_rated, voltage rating Uc_rated, no-voltage, negative sense voltage rating-Uc_rated.
, there is reversed cut-off electricity in the case where when reversed for the electric current in above-mentioned several operating statuses based on diode both ends are worked as
The principle that diode turns off when pressure, it is exactly in above-mentioned eight kinds of operating statuses that current direction when electric current is reversed, which has been merely able to one kind,
The case where description.
In addition, the submodule is there are two types of non-blocking mode, when non-blocking mode and reversed electric current when being electric current forward direction respectively
Non-blocking mode, wherein can use Fig. 3-a come operating status of the submodule under non-blocking mode when indicating electric current forward direction, benefit
With Fig. 4 come operating status of the submodule under non-blocking mode when indicating that electric current is reversed.
When the submodule is applied in MMC inverter as shown in Figure 1, submodule may be implemented by the combination of different conditions
The sequence of block is pressed, and can satisfy the demand under normal condition and direct-current short circuit malfunction.
The submodule, which can be realized, passes through and uses not closedown mode progress direct current using closedown mode progress DC Line Fault
Fault traversing two ways.
DC Line Fault is carried out according to closedown mode to pass through, using the inverse electromotive force of capacitor C2 and capacitor C3 in topology,
I.e. the submodule can provide 1 times of reversed specified submodule voltage-Uc_rated for inverter, current direction as shown in figure 4,
Current direction is negative.If all using the submodule in MMC converter bridge arm, the voltage that the bridge arm exports under latch status
It is equal in magnitude with DC bus-bar voltage, it is contrary.So enable to direct fault current to be reduced rapidly using closedown mode,
Achieve the purpose that DC Line Fault passes through.After fault clearance, rearrangement is pressed and is unlocked, and completes entire fault traversing process.
DC Line Fault is carried out according to not closedown mode to pass through, then needs the ability using submodule output negative voltage, i.e.,
After DC Line Fault generation, the DC voltage of submodule is overturn as negative value, to inhibit fault current, to fault current close to 0
Afterwards, control DC voltage is 0, the grid connection state of exchange side is maintained in whole process, and alternating voltage is constant.To fault clearance
Afterwards, it does not need to be ranked up and presses and unlock process, it is only necessary to promote DC voltage.
It is not latched DC Line Fault and passes through principle as shown in fig. 5, it is assumed that including N number of submodule in each bridge arm of MMC, then can
The maximum reverse DC voltage enough exported are as follows:
-Udc_max=2 (Uac_peak-2NUC(the U of)=2ac_peak-NUC_rated)
Wherein Uac_peakFor the alternating voltage peak needed for running.
It, can be with the full-bridge submodule MMC of same level number, identical DC voltage level for the economy of the submodule
It compares.Level number is in the full-bridge submodule MMC of N+1, and N number of comprising full-bridge submodule, needing switching device number altogether is 4N
It is a；And use in the MMC of submodule provided by the invention, under same DC voltage level, when exporting N+1 level, due to
Submodule maximum output voltage provided by the invention is twice of full-bridge submodule maximum output voltage, only need to include N/2 therefore
A submodule, needing switching device number altogether is 6*N/2=3N.Due to switching device in flexible DC transmission engineering cost this
Body just occupies larger specific gravity, therefore submodule topology provided by the invention can be effectively reduced flexibility compared with full-bridge submodule
DC engineering cost, moreover, voltage class is higher, when output level number is higher, the number of the switching device of saving is more.
Submodule topology embodiment
Submodule topology provided in this embodiment is topology shown in Fig. 2, specific structure and work due to the topology
Specific descriptions have been made in principle etc. in above-mentioned inverter embodiment, and the present embodiment just no longer illustrates.
Moreover, the submodule in the present embodiment suitable for MMC inverter, still, is also not excluded for applying in other occasions
A possibility that.
Specific embodiment is presented above, as shown in Fig. 2, giving the specific topological diagram of the submodule, but this hair
It is bright to be not limited to specific topology.Basic ideas of the invention are the basic framework of the submodule, as shown in Figure 6, wherein rectangle
Frame indicates switch module, for those of ordinary skill in the art, right under the premise of not changing the basic principle of the submodule
The equivalent transformation of the topology does not need to spend creative work, such as: exchange switch module T5 and T6；Or first part and
Second part location swap, as shown in Figure 7.In above two embodiment, accordingly modified in corresponding control strategy
In the case of, it equally can be realized corresponding function.Therefore, in the case where not departing from the basic principle of the submodule to the submodule
The change, modification, replacement and modification of progress are still fallen in protection scope of the present invention.
Claims (4)
1. a seed module is topological, which is characterized in that including first unit and second unit, the first unit and second unit
It is made of a switching branches and a capacitive branch parallel connection, string is set there are two switch module in the switching branches, described
String is set there are two capacitor on capacitive branch；One of tie point and second of switching branches and capacitive branch in first unit
It is connected with switch module T5 between one of tie point of switching branches and capacitive branch in unit, two in first unit
Switch module T6 is connected between the tie point of two capacitors in the tie point and second unit of a capacitor, in first unit
The tie point of two switch modules in the tie point and second unit of two switch modules is the input of the submodule topology
Output end；
Two switch modules in the first unit are respectively switch module T1 and T2, two capacitance modules in first unit
Respectively capacitor C1 and C2, two switch modules in second unit are respectively switch module T3 and T4, and two in second unit
A capacitance module is respectively capacitor C3 and C4；The anode of the anode connection capacitor C1 of switch module T1, the cathode of switch module T1
The anode of connection switch module T2, the cathode of the cathode connection capacitor C2 of switch module T2；The anode of switch module T3 connects electricity
Hold the anode of C3, the cathode of the anode of the cathode connection switch module T4 of switch module T3, switch module T4 connects capacitor C4's
Cathode；The cathode of tie point connection switch module T5 between the cathode of switch module T2 and the cathode of capacitor C2, switch module
The anode of tie point connection switch module T5 between the anode of T3 and the anode of capacitor C3；The cathode of capacitor C1 is with capacitor C2's
The anode of tie point connection switch module T6 between anode, the tie point between the cathode of capacitor C3 and the anode of capacitor C4 connect
Connect the cathode of switch module T6.
2. submodule topology according to claim 1, which is characterized in that each switch module is anti-with diode by switching device
It is constituted to parallel connection.
3. a kind of MMC inverter, including 3 phases, every phase is made of upper and lower two bridge arms, and each bridge arm is by n sub-module cascade structure
At, which is characterized in that it includes first unit and second unit that the MMC inverter, which has at least one submodule, and described first is single
Member and second unit are made of a switching branches and a capacitive branch parallel connection, are gone here and there in the switching branches and are opened there are two setting
Module is closed, string sets that there are two capacitors on the capacitive branch；One of them of switching branches and capacitive branch in first unit
Switch module T5 is connected between one of tie point of switching branches and capacitive branch in tie point and second unit, the
It is connected with switch module T6 between the tie point of two capacitors in the tie point and second unit of two capacitors in Unit one,
The tie point of two switch modules in the tie point and second unit of two switch modules in first unit is the submodule
The input/output terminal of block topology；
Two switch modules in the first unit are respectively switch module T1 and T2, two capacitance modules in first unit
Respectively capacitor C1 and C2, two switch modules in second unit are respectively switch module T3 and T4, and two in second unit
A capacitance module is respectively capacitor C3 and C4；The anode of the anode connection capacitor C1 of switch module T1, the cathode of switch module T1
The anode of connection switch module T2, the cathode of the cathode connection capacitor C2 of switch module T2；The anode of switch module T3 connects electricity
Hold the anode of C3, the cathode of the anode of the cathode connection switch module T4 of switch module T3, switch module T4 connects capacitor C4's
Cathode；The cathode of tie point connection switch module T5 between the cathode of switch module T2 and the cathode of capacitor C2, switch module
The anode of tie point connection switch module T5 between the anode of T3 and the anode of capacitor C3；The cathode of capacitor C1 is with capacitor C2's
The anode of tie point connection switch module T6 between anode, the tie point between the cathode of capacitor C3 and the anode of capacitor C4 connect
Connect the cathode of switch module T6.
4. MMC inverter according to claim 3, which is characterized in that each switch module is anti-with diode by switching device
It is constituted to parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710087627.9A CN106849718B (en) | 2017-02-17 | 2017-02-17 | One seed module topology and a kind of MMC inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710087627.9A CN106849718B (en) | 2017-02-17 | 2017-02-17 | One seed module topology and a kind of MMC inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106849718A CN106849718A (en) | 2017-06-13 |
| CN106849718B true CN106849718B (en) | 2019-01-29 |
Family
ID=59128543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710087627.9A Active CN106849718B (en) | 2017-02-17 | 2017-02-17 | One seed module topology and a kind of MMC inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106849718B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039361B (en) * | 2020-09-04 | 2023-09-01 | 华北电力大学（保定） | MMC sub-module and MMC blocking-free low-voltage fault ride-through method using same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012024984A1 (en) * | 2010-07-22 | 2012-03-01 | 荣信电力电子股份有限公司 | Modular multilevel converter-based transformerless battery energy storage topology |
| CN102611096A (en) * | 2012-03-13 | 2012-07-25 | 浙江大学 | Bipolar direct current power transmission system with direct current failure self-elimination capacity |
| CN103219738A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Direct current transmission system based on three-pole type structure |
| CN104638615A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Modular multilevel converter with direct-current fault isolation function and submodule thereof |
-
2017
- 2017-02-17 CN CN201710087627.9A patent/CN106849718B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012024984A1 (en) * | 2010-07-22 | 2012-03-01 | 荣信电力电子股份有限公司 | Modular multilevel converter-based transformerless battery energy storage topology |
| CN102611096A (en) * | 2012-03-13 | 2012-07-25 | 浙江大学 | Bipolar direct current power transmission system with direct current failure self-elimination capacity |
| CN103219738A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Direct current transmission system based on three-pole type structure |
| CN104638615A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Modular multilevel converter with direct-current fault isolation function and submodule thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106849718A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104410260B (en) | Fault-tolerance-capability-equipped MMC sub-module structure capable of realizing DC fault self-protection, and MMC modulation method thereof | |
| EP3651305A1 (en) | Chained multi-port grid-connected interface apparatus and control method | |
| CN104052026B (en) | For submodule topology and the application thereof of modularization multi-level converter | |
| EP3001556B1 (en) | Hybrid converter and wind power generation system | |
| CN104320011B (en) | Hybrid sub-module MMC converter with direct-current fault ride-through capability | |
| CN104753043B (en) | Multi-level current converter with direct-current fault ride-through capability and working method | |
| CN106452136A (en) | Multi-port power electronic converter for energy internet | |
| US20200076321A1 (en) | Charging method for sub-module based hybrid converter | |
| CN104821736A (en) | Modularized multi-level converter with function of DC side short circuit protection | |
| CN102549907A (en) | Converter with active fault current limitation | |
| CN106411166A (en) | Modular multi-level converter hybrid bridge arm topology structure | |
| CN107039980B (en) | High-voltage direct current power flow controller | |
| CN102097967B (en) | Cascaded multi-level converter | |
| CN104993716A (en) | Modular multilevel converter and hybrid double-unit sub-module | |
| CN102969708A (en) | Interline power flow controller based on modular multi-level converter structure | |
| CN108023494A (en) | A kind of modularization multi-level converter and its sub-modular structure | |
| CN205647264U (en) | Three level submodule pieces of MMC with direct current short -circuit current is from scavenging ability | |
| EP3157120B1 (en) | Modular multi-level flexible direct-current topology circuit suitable for fault ride-through | |
| CN214314552U (en) | Multifunctional multiport hybrid direct current breaker | |
| CN106787877A (en) | Antithesis unipolar voltage module chain and its mixed multi-level current transformer | |
| CN106849718B (en) | One seed module topology and a kind of MMC inverter | |
| CN112865046A (en) | Multifunctional multiport hybrid direct current breaker and control method | |
| CN110829867A (en) | Novel MMC submodule topology with fault current symmetrical clearing capacity | |
| Woldegiorgis et al. | A new hybrid voltage source converter with reduced device count for HVDC applications | |
| Alsolami et al. | A gallium nitride device based switched capacitor multilevel converter for UPS applications |
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 |