CN106849717B - Striding capacitance tri-level single electrode current module - Google Patents
Striding capacitance tri-level single electrode current module Download PDFInfo
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- CN106849717B CN106849717B CN201611146206.0A CN201611146206A CN106849717B CN 106849717 B CN106849717 B CN 106849717B CN 201611146206 A CN201611146206 A CN 201611146206A CN 106849717 B CN106849717 B CN 106849717B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/483—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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
-
- 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
- H02M7/4837—Flying capacitor converters
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0085—Partially controlled bridges
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention proposes a kind of striding capacitance tri-level single electrode current module, by the first parallel branch, the second parallel branch and the second capacitor C2It constitutes, the first parallel branch includes the first full control switching element T1, the second full control switching element T2, first diode D1, the second diode D2With first capacitor C1, the second parallel branch includes full control switching device unit T3, diode D3, T1Emitter and T2Collector be connected, T1Collector and D2Anode be connected, D1Anode and D2Cathode be connected, C1Anode and D1Anode and D2Cathode be connected, C1Cathode be connected with the collector of T1 emitter and T2, T3Emitter and D3Cathode connection, the anode and C of the anode of the first parallel branch, the second parallel branch2Anode be connected with each other, the cathode and C of the cathode of the first parallel branch, the second parallel branch2Cathode be connected with each other.The present invention has the advantages that at low cost, compact-sized.
Description
Technical field
The present invention relates to power electronic technique technical field, in particular to a kind of striding capacitance tri-level single electrode current mould
Block.
Background technique
Power module is the base unit of high-power Multilevel Inverters, including cascade connection multi-level current transformer, modularization are more
It include a large amount of power module unit in the current transformers such as level current transformer.With cascade connection multi-level current transformer, modular multilevel
Current transformer is the Multilevel Inverters of representative, because with current harmonics characteristic is good, decoupled active and reactive control, modularized design,
The advantages that being easy to implement failure tolerant operation, in high-power power converter occasion, such as flexible DC transmission, large capacity dynamic
The fields such as reactive compensation, power quality controlling, motor frequency conversion driving have obtained extensive utilization.
By taking modular multi-level converter as an example, operation characteristic depends on the circuit structure of its power module.Traditional
Half-bridge module structure, which has, is lost smaller, lower-cost advantage, but due to that can not provide negative level voltage, thus can not be straight
Flow side low-voltage under transmission power, can not current transformer occur dc-side short-circuit fault after fault current limiting.In addition, by half
Its bridge arm voltage of the bridge arm of bridge module composition is positive always, therefore is not easy to reduce by the bridge arm voltage of injection high frequency variation
The fluctuating range of module capacitance voltage.
For the working performance of hoisting module Multilevel Inverters, half can be replaced using the module for being capable of providing negative level
Bridge module.The module for being capable of providing negative level that existing research proposes includes: full-bridge modules, clamp Dual module (CDSM, clamp-
Double sub-module), (Marquardt, R., " Modular Multilevel Converter:An universal
concept for HVDC-Networks and extended DC-Bus-applications,"Power Electronics
Conference (IPEC), 2010 International, vol., no., pp.502,507,21-24 June 2010.), it is single
Pole tension module (Jiangchao Qin；Saeedifard,M.；Rockhill,A.；Rui Zhou,"Hybrid Design of
Modular Multilevel Converters for HVDC Systems Based on Various Submodule
Circuits,"in Power Delivery,IEEE Transactions on,vol.30,no.1,pp.385-394,
Feb.2015.), diagonal bridge module (patent publication No. CN105450045A).
Above-mentioned power module is compared with half-bridge module, and under the premise of obtaining same level number, full-bridge modules, clamp are double
Module and unipolar voltage module are required to using greater number of controllable switch device, and increased costs are larger.And diagonal bridge module
The controllable switch number of devices of use is consistent with half-bridge module, and increased costs are less.However, in diagonal bridge module two controllably open
The diagonal position that device is distributed in module is closed, therefore controllable switch device therein can only use individual devices module respectively, and
It is the same without image of Buddha half-bridge module, using the higher two-tube module of integrated level, it is unfavorable for the Integration Design of module.Also, every increasing
Add a diagonal bridge module, the overall level number of current transformer only increases by two, needs a large amount of diagonal bridge mould in high voltage application field
Block, auxiliary device and equipment entirety use space volume are larger, and structure is not compact enough.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, there is cost an object of the present invention is to provide a kind of striding capacitance tri-level single electrode current module
Low, compact-sized advantage.
Second object of the present invention is to propose a kind of monopolar current unsteady flow chain.
Third object of the present invention is to propose a kind of modular multi-level converter.
To achieve the goals above, it is extremely electric to disclose a kind of striding capacitance tri-level single for the embodiment of first aspect present invention
Flow module, by the first parallel branch, the second parallel branch and the second capacitor C2It constitutes, wherein first parallel branch includes:
First full control switching element T1, the second full control switching element T2, first diode D1, the second diode D2With first capacitor C1, institute
Stating the second parallel branch includes: full control switching device unit T3, diode D3, wherein the T1Emitter and T2Collection
Electrode is connected, the T1Collector and D2Anode be connected in one of striding capacitance tri-level single electrode current module end
Mouth A, D1Anode and D2Cathode be connected, D1Anode of the cathode as the first parallel branch, T2Emitter as first simultaneously
Join the cathode of branch, first capacitor C1Anode respectively with D1Anode and D2Cathode be connected, C1Cathode respectively with the hair of T1
The collector of emitter-base bandgap grading and T2 are connected, T3Emitter and D3Cathode be connected to the striding capacitance tri-level single electrode current module
Another port B, D3Cathode of the anode as the second parallel branch, T3Anode of the collector as the second parallel branch,
The anode of first parallel branch, the anode of the second parallel branch and the second capacitor C2Anode be connected with each other, described first
The cathode of parallel branch, the cathode of the second parallel branch and the second capacitor C2Cathode be connected with each other；Alternatively, the T1Transmitting
Pole and T2Collector be connected, T2Emitter and D1Cathode be connected to the striding capacitance tri-level single electrode current module
Another port B, D1Anode and D2Cathode be connected, D2Cathode of the anode as first parallel branch, T1Current collection
Anode of the pole as first parallel branch, first capacitor C1Anode respectively with T1Emitter and T2Collector be connected
It connects, the C1Cathode respectively with D1Anode and D2Cathode be connected, T3Collector and D3Anode be connected to it is described fly across
The a port A, D of capacitor tri-level single electrode current module3Anode of the cathode as the second parallel branch, T3Emitter make
For the cathode of the second parallel branch, the anode of first parallel branch, the anode of the second parallel branch and the second capacitor C2's
Anode is connected with each other, the cathode of first parallel branch, the cathode of the second parallel branch and the second capacitor C2Cathode it is mutual
Connection.
In addition, striding capacitance tri-level single electrode current module according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
In some instances, the first capacitor C1Rated operational voltage UdcIt is approximately the second capacitor C2It is specified
The half of operating voltage, the T1、T2、D1、D2It is all made of and is suitable for rated operational voltage for UdcSwitching device.
In some instances, the full control switching device unit T3Including one or more full control switching devices, wherein institute
Multiple full control switching devices are stated to be connected in series.
In some instances, the diode D3Including one or more diodes, wherein the multiple diode
It is connected in series.
In some instances, the T1、T2、T3Control electronic power switch device entirely for inverse-impedance type.
In some instances, the T1、T2、T3Electronic power switch device is controlled entirely for inverse conductivity type, wherein each described inverse
Conductivity type controls electronic power switch device entirely and includes a freewheeling diode, the anode of each freewheeling diode with it is corresponding inverse
The emitter that conductivity type controls electronic power switch device entirely is connected, and the cathode of each freewheeling diode controls electric power with corresponding inverse conductivity type entirely
The collector of electronic switching device is connected.
In some instances, pass through the electric current i of the striding capacitance tri-level single electrode current moduleSMDirection always from institute
Port A inflow is stated, and is flowed out from the port B.
In some instances, there are the striding capacitance tri-level single electrode current modules between the port A and port B
Port voltage uSM, as the T1、T2、T3When being turned off, the port voltage of the striding capacitance tri-level single electrode current module
uSMIt is approximately equal to 2Udc；As the T1、T2、T3When being both turned on, the port voltage of the striding capacitance tri-level single electrode current module
uSMIt is approximately equal to -2Udc；As the T1Conducting and T2、T3Shutdown or the T2Conducting and T1、T3When shutdown, the striding capacitance
The port voltage u of tri-level single electrode current moduleSMIt is approximately equal to Udc；As the T1Shutdown and T2、T3Conducting or the T2Shutdown
And T1、T3When conducting, the port voltage u of the striding capacitance tri-level single electrode current moduleSMIt is approximately equal to-Udc；As the T1、
T2Conducting and T3Shutdown or the T1、T2Shutdown and T3When conducting, the port electricity of the striding capacitance tri-level single electrode current module
Press uSMIt is approximately equal to 0.
Striding capacitance tri-level single electrode current module according to an embodiment of the present invention is suitable for single electric current direction application,
The full control switching device number used is less therefore at low cost；And used full control switching device can be using integrated level more
High two-tube module, it is easier to realize the Integration Design of module, therefore structure is more compact.
To achieve the goals above, the embodiment of second aspect of the present invention also proposed a kind of monopolar current unsteady flow chain, packet
One or more concatenated striding capacitance tri-level single electrode current modules are included, the striding capacitance tri-level single electrode current module is
Striding capacitance tri-level single electrode current module described in the above-mentioned first aspect embodiment of the present invention.
Monopolar current unsteady flow chain according to an embodiment of the present invention, by one or more striding capacitance tri-level single electrode current moulds
Block is in series, has the advantages that at low cost, compact-sized.
To achieve the goals above, the embodiment of third aspect present invention also proposed a kind of modular multilevel unsteady flow
Device, including monopolar current unsteady flow chain described in the above-mentioned second aspect embodiment of the present invention.
Modular multi-level converter according to an embodiment of the present invention, by striding capacitance tri-level single electrode current module structure
At, only by monopolar current, when output phase is with positive level number, used full control switching device is identical as half-bridge module,
Can provide with the same number of negative level of positive level, facilitate improve current transformer DC voltage under low-voltage and low-frequency operation
Performance, and increase the DC Line Fault locking function of current transformer.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the circuit structure diagram according to the striding capacitance tri-level single electrode current module of an embodiment of the present invention；
Fig. 2 is the circuit structure diagram of striding capacitance tri-level single electrode current module in accordance with another embodiment of the present invention；
Fig. 3 is that the inverse-impedance type according to an embodiment of the invention that is based on controls switching device cellular construction figure entirely；
Fig. 4 is according to an embodiment of the invention to control switching device cellular construction figure entirely based on inverse conductivity type；
Fig. 5 is the structure chart of diode according to an embodiment of the invention；
Fig. 6 is the schematic diagram of monopolar current unsteady flow chain according to an embodiment of the invention；And
Fig. 7 is modular multi-level converter schematic diagram according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Striding capacitance tri-level single electrode current module according to an embodiment of the present invention, monopolar current are described below in conjunction with attached drawing
Unsteady flow chain and modular multi-level converter.
Fig. 1 is the circuit structure diagram of striding capacitance tri-level single electrode current module according to an embodiment of the invention.Such as
Shown in Fig. 1, the striding capacitance tri-level single electrode current module of the embodiment of the present invention by the first parallel branch, the second parallel branch and
Second capacitor C2It constitutes, wherein the first parallel branch includes: the first full control switching element T1, the second full control switching element T2,
One diode D1, the second diode D2With first capacitor C1, the second parallel branch includes: full control switching device unit T3, diode
Cells D3。
More specifically, Fig. 1 (a) is the striding capacitance for controlling switching device entirely based on inverse-impedance type of one embodiment of the invention
The circuit structure diagram of tri-level single electrode current module.Fig. 1 (b) is that another embodiment of the present invention controls switch based on inverse-impedance type entirely
The circuit structure diagram of the striding capacitance tri-level single electrode current module of device.
Specifically, as shown in Fig. 1 (a), T1Emitter and T2Collector be connected in the E point in Fig. 1 (a), T1Current collection
Pole and D2Anode be connected in a port A, D of striding capacitance tri-level single electrode current module1Anode and D2Cathode be connected
F point in Fig. 1 (a), D1Anode of the cathode as the first parallel branch, T2Yin of the emitter as the first parallel branch
Pole, first capacitor C1Anode respectively with D1Anode and D2Cathode be connected namely first capacitor C1 anode access F point, C1
Cathode be connected respectively with the collector of the emitter of T1 and T2 namely C1Cathode access E point, T3Emitter and D3Yin
Pole is connected to another port B, D of striding capacitance tri-level single electrode current module3Yin of the anode as the second parallel branch
Pole, T3Anode of the collector as the second parallel branch, the anode of the first parallel branch, the anode of the second parallel branch and
Two capacitor C2Anode be connected with each other, the cathode of the first parallel branch, the cathode of the second parallel branch and the second capacitor C2Cathode
It is connected with each other.Alternatively,
As shown in Fig. 1 (b), T1Emitter and T2Collector be connected in the E point in Fig. 1 (b), T2Emitter and D1
Cathode be connected to another port B, D of striding capacitance tri-level single electrode current module1Anode and D2Cathode be connected in figure
F point in 1 (b), D2Cathode of the anode as the first parallel branch, T1Anode of the collector as the first parallel branch,
One capacitor C1Anode respectively with T1Emitter and T2Collector be connected namely the anode of first capacitor C1 access E point,
C1Cathode respectively with D1Anode and D2Cathode be connected namely C1Cathode access F point, T3Collector and D3Anode connect
It is connected to a port A, D of striding capacitance tri-level single electrode current module3Anode of the cathode as the second parallel branch, T3's
Cathode of the emitter as the second parallel branch, the anode of the first parallel branch, the anode of the second parallel branch and the second capacitor
C2Anode be connected with each other, the cathode of the first parallel branch, the cathode of the second parallel branch and the second capacitor C2Cathode mutually interconnect
It connects.
Wherein, in conjunction with shown in Fig. 1 (a) and Fig. 1 (b), in one embodiment of the invention, first capacitor C1It is positive with it is negative
Voltage difference between pole is Udc1, the second capacitor C2Voltage difference between positive electrode and negative electrode is Udc2.Based on this, first capacitor C1's
Rated operational voltage UdcIt is approximately the second capacitor C2Rated operational voltage half, i.e. Udc1=Udc2/ 2=Udc；T1、T2、D1、
D2It is all made of and is suitable for rated operational voltage for UdcSwitching device.Further, for example, T3Rated operational voltage, which can be used, is
2UdcA full control switching device, can also be U by two rated operational voltagesdcFull control switching device it is in series；D3It can
Use rated operational voltage for 2UdcA diode, can also be U by two rated operational voltagesdcDiode series structure
At.
In one embodiment of the invention, switching device unit T is controlled entirely3Switching devices are controlled entirely including one or more,
Wherein, multiple full control switching devices are connected in series.Work as T3When including a full control switching device, this full control switching device
Rated operational voltage is 2Udc, work as T3When including multiple full control switching devices, the rated operational voltage of this multiple full control switching device
Summation is 2Udc.As specific example, for example, in conjunction with shown in Fig. 3 and Fig. 4, it is complete to control switching device unit T3Such as it can be by 1
Full control switching element T31It constitutes, Fig. 3 (a) and Fig. 4 (a) is seen, at this point, T31Current collection extremely T3Collector, T31Transmitting extremely
T3Emitter, T31Rated operational voltage be 2Udc.On the other hand, T3It can also be by controlling switching element T entirely31And T32Series connection structure
At Fig. 3 (b) and Fig. 4 (b) being seen, at this point, T31Collector as T3Collector, T31Emitter and T32Collector phase
Even, T32Emitter as T3Emitter, T31、T32Rated operational voltage be Udc。
In one embodiment of the invention, diode D3Including one or more diodes, wherein multiple two poles
Pipe is connected in series.Work as D3When including a diode, the rated operational voltage of this diode is 2Udc, work as D3Including multiple
When diode, the rated operational voltage summation of this multiple diode is 2Udc.As specific example, for example, as shown in connection with fig. 5,
Diode D3Such as it can be by 1 diode D31It constitutes, sees Fig. 5 (a), at this time D31Cathode be D3Cathode, D31Anode
For D3Anode, D31Rated operational voltage be 2Udc.On the other hand, D3It can also be by diode D31And D32It is in series, see Fig. 5
(b), D at this time31Cathode as D3Cathode, D31Anode and D32Cathode be connected, D32Anode as D3Anode, D31、
D32Rated operational voltage be Udc。
In one embodiment of the invention, T1、T2、T3Electronic power switch device can be controlled entirely for inverse-impedance type.In conjunction with upper
The example stated, in other words, for example, controlling switching element T entirely1、T2、T31、T32Inverse-impedance type can be used and control electronic power switch device entirely,
Typical such as integrated gate commutated thyristor (IGCT) or gate level turn-off thyristor (GTO), also, inverse-impedance type controls power electronics entirely
It does not include freewheeling diode inside switching device.Control the striding capacitance tri-level single of electronic power switch device entirely based on inverse-impedance type
The structure of electrode current module is shown in shown in Fig. 1 (a) and Fig. 1 (b).
In another embodiment of the present invention, T1、T2、T3Or inverse conductivity type controls electronic power switch device entirely,
In, each inverse conductivity type controls electronic power switch device entirely and includes a freewheeling diode, the anode of each freewheeling diode with
The emitter that corresponding inverse conductivity type controls electronic power switch device entirely is connected, and the cathode of each freewheeling diode and corresponding inverse conductivity type are complete
The collector for controlling electronic power switch device is connected.In conjunction with example above, in other words, for example, controlling switching element T entirely1、T2、
T31、T32Inverse conductivity type can also be used and control electronic power switch device entirely, it is typical such as insulation gate pole bipolar junction transistor (IGBT).Often
It includes a freewheeling diode that a inverse conductivity type controls electronic power switch device inside entirely, and the anode of freewheeling diode and full control switch
The emitter of device is connected, and the cathode of freewheeling diode is connected with the collector of full control switching device.Specifically, it is based on inverse conductivity type
The structure of the striding capacitance tri-level single electrode current module of full control electronic power switch device is shown in that Fig. 2 (a) and Fig. 2 (b) is shown,
Middle T1Internal freewheeling diode is D1e、T2Internal freewheeling diode is D2e、T31Internal freewheeling diode is D31e, T32It is interior
The freewheeling diode in portion is D32e。
In one embodiment of the invention, referring to figs. 1 and 2, pass through striding capacitance tri-level single electrode current mould
The electric current i of blockSMDirection always from port A flow into, and from port B flow out.There are striding capacitances three between port A and port B
The port voltage u of level monopolar current moduleSM, that is to say, that the voltage difference between port A, B is striding capacitance tri-level single pole
The port voltage u of current moduleSM.Specifically, work as T1、T2、T3When being turned off, the end of striding capacitance tri-level single electrode current module
Mouth voltage uSMIt is approximately equal to 2Udc；Work as T1、T2、T3When being both turned on, the port voltage u of striding capacitance tri-level single electrode current moduleSM
It is approximately equal to -2Udc；Work as T1Conducting and T2、T3Shutdown or T2Conducting and T1、T3When shutdown, striding capacitance tri-level single electrode current mould
The port voltage u of blockSMIt is approximately equal to Udc；Work as T1Shutdown and T2、T3Conducting or T2Shutdown and T1、T3When conducting, striding capacitance three
The port voltage u of level monopolar current moduleSMIt is approximately equal to-Udc；Work as T1、T2Conducting and T3Shutdown or T1、T2Shutdown and T3It leads
When logical, the port voltage u of striding capacitance tri-level single electrode current moduleSMIt is approximately equal to 0.
To sum up, the striding capacitance tri-level single electrode current module of the above embodiment of the present invention is that one kind only allows single side
The single-phase striding capacitance three-level voltage source module passed through to electric current is suitable for single electric current direction application.Its with can pass through it is double
Compare to the striding capacitance three-level voltage source module of electric current, used full control switching device can save 1/2；With full-bridge mould
Block, unipolar voltage module are compared with clamp Dual module, when output phase is with number of levels, full control switching device that the present invention uses
Number is less, is the 1/2 of full-bridge modules, is the 2/3 of unipolar voltage module and clamp Dual module, and cost is relatively lower, therefore, this
Invention has the advantages that at low cost.On the other hand, exportable three level voltage of bipolarity of the present invention, with output phase with positive negative level
The diagonal bridge module of two of number is compared, and the full control switching device that the present invention uses can use the higher two-tube mould of integrated level
Block, it is easier to realize the Integration Design of module, structure is more compact, therefore has the advantages that compact-sized.
Striding capacitance tri-level single electrode current module according to an embodiment of the present invention is suitable for single electric current direction application,
The full control switching device number used is less therefore at low cost；And used full control switching device can be using integrated level more
High two-tube module, it is easier to realize the Integration Design of module, therefore structure is more compact.
Further embodiment of the present invention also proposed a kind of monopolar current unsteady flow chain.
Specifically, the monopolar current unsteady flow chain of the embodiment of the present invention includes one or more concatenated three level of striding capacitance
Monopolar current module, the striding capacitance tri-level single electrode current module are, for example, to fly described in the above embodiment of the present invention across electricity
Hold tri-level single electrode current module.In other words, by three electricity of striding capacitance described in one or more the above embodiment of the present invention
Flat monopolar current module is serially connected, and monopolar current unsteady flow chain can be obtained.
It is by 2n (n is natural number and n >=1) a striding capacitance tri-level single electrode current block coupled in series for shown in Fig. 6
The monopolar current unsteady flow chain 10 of composition.Including the n striding capacitance tri-level single electrode current I pattern blocks as shown in Fig. 1 (a)
With the n striding capacitance tri-level single electrode current II pattern blocks as shown in Fig. 1 (b).Wherein first striding capacitance tri-level single
First striding capacitance tri-level single is accessed as an endpoint port P, B of unsteady flow chain 10 in the port A of electrode current I pattern block
Electrode current II pattern block M2The port A, the port B of first striding capacitance tri-level single electrode current II pattern block, access second
The port ... A of a striding capacitance tri-level single electrode current I pattern block, a three level of striding capacitance of kth (k=1,2 ..., n-1)
Monopolar current I pattern block MkThe port B access k-th of striding capacitance tri-level single electrode current II pattern block the port ... A, n-th
Another endpoint N of the port B of a striding capacitance tri-level single electrode current II pattern block as monopolar current unsteady flow chain 10；P and N
Between voltage difference be monopolar current unsteady flow chain 10 port voltage USM。
In monopolar current unsteady flow chain 10, electric current i is flowed throughSMDirection flow to N-terminal from the end P always, wherein flow through k-th fly
The current direction of across capacitor tri-level single electrode current module is flowed into from its port A always, is flowed out from the port B.Enable k-th of (k=
1,2 ..., n-1) striding capacitance tri-level single electrode current module port voltage be uSMk, as previously mentioned, k-th of control flies across electricity
Hold in tri-level single electrode current module and controls switching element T entirely1、T2、T3Switch off and on state, may make the port of the module
Voltage uSMkIt is approximately equal to ± 2Udc、±Udc, 0 amount to five kinds of level；Correspondingly, n striding capacitance tri-level single electrode current module
In the port voltage of each module above-mentioned five kinds of level can be obtained；Due to n striding capacitance tri-level single electrode current module phase
Mutually series connection, the port voltage U of the unsteady flow chainSMFor the sum of n striding capacitance tri-level single electrode current module port voltage, therefore the change
Flow the port voltage U of chain 10SMIt is capable of forming approximation ± 2nUdc、±(2n-1)·Udc、±(2n-2)·Udc、±3Udc、±
2Udc、±Udc, 0, total 4n+1 level.
It should be noted that the specific implementation and the embodiment of the present invention of the monopolar current unsteady flow chain of the embodiment of the present invention
Striding capacitance tri-level single electrode current module specific implementation it is similar, it is extremely electric specifically to refer to striding capacitance tri-level single
The description of flow module part, in order to reduce redundancy, details are not described herein again.
To sum up, monopolar current unsteady flow chain according to an embodiment of the present invention, by one or more striding capacitance tri-level singles pole
Current module is in series, has the advantages that at low cost, compact-sized.
Further embodiment of the present invention also proposed a kind of modular multi-level converter, including the above-mentioned implementation of the present invention
Monopolar current unsteady flow chain described in example.
Specifically, example above-mentioned is based on, as neutral point clamp tri-level single electrode current module and monopolar current unsteady flow
A kind of Application Example of chain 10 can further constitute modular multi-level converter by monopolar current unsteady flow chain 10.
As shown in fig. 7, modular multi-level converter (30,40) is usually by the identical three-phase A of structure, B, C and DC side
Positive DC+, DC side cathode DC- are constituted；Every phase is in series by upper and lower two identical bridge arms, and each bridge arm is filtered by 1
Wave reactor L and 1 monopolar current unsteady flow chain 10 or 1 neutral point clamp tri-level single electrode current module are serially connected composition；Respectively
Bridge arm positive terminal P+ is as the phase DC side positive terminal in phase, and each phase lower bridge arm negative pole end N- is as the phase DC side negative pole end；
The DC side positive terminal of each phase of current transformer connects the DC side anode DC+ for forming current transformer, the DC side of each phase of current transformer jointly
Negative pole end connects the DC side cathode DC- for forming current transformer jointly；Bridge arm negative pole end P- and lower bridge arm positive terminal N+ in every phase
Tie point is respectively every phase exchange side Ac, Bc, Cc；Ac, Bc, Cc respectively with every phase line end Ag, Bg, the Cg connection of alternating voltage.
Each bridge arm current i of modular multi-level converter 30SMDirection, in bridge arm unsteady flow chain 10 or monopole electricity
The current direction of flow module is identical, flows to bridge arm negative pole end N- from bridge arm positive terminal P+ always, the power of current transformer 30 always from
DC side flow direction exchange side；Each bridge arm current i of modular multi-level converter 40SMDirection, with the unsteady flow chain in bridge arm
10 or monopolar current module current direction on the contrary, flowing to bridge arm positive terminal P+ from bridge arm negative pole end N- always, 40 power begins
Eventually from effluent is exchanged to DC side.
It should be noted that modular multi-level converter (30,40) the also identical two-phase building or general of possible constructions
For can be constructed with multiphase.
To sum up, modular multi-level converter according to an embodiment of the present invention, by striding capacitance tri-level single electrode current mould
Block is constituted, and only passes through monopolar current, when output phase is with positive level number, used full control switching device and half-bridge module phase
Together, it is possible to provide with the same number of negative level of positive level, help to improve current transformer direct current under low-voltage and low-frequency operation
The performance of pressure, and increase the DC Line Fault locking function of current transformer.
In addition, other compositions of modular multi-level converter according to an embodiment of the present invention and effect are for this field
Those of ordinary skill for be all it is known, in order to reduce redundancy, do not repeat them here.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (6)
1. a kind of striding capacitance tri-level single electrode current module, which is characterized in that by the first parallel branch, the second parallel branch and
Second capacitor C2It constitutes, wherein first parallel branch includes: the first full control switching element T1, the second full control switching device
T2, first diode D1, the second diode D2With first capacitor C1, second parallel branch includes: full control switching device unit
T3, diode D3, wherein
The T1Emitter and T2Collector be connected, the T1Collector and D2Anode be connected in the striding capacitance three
The a port A, D of level monopolar current module1Anode and D2Cathode be connected, D1Cathode as the first parallel branch
Anode, T2Cathode of the emitter as the first parallel branch, first capacitor C1Anode respectively with D1Anode and D2Cathode
It is connected, C1Cathode respectively with T1Emitter and T2Collector be connected, T3Emitter and D3Cathode be connected to it is described fly
Another port B, D of across capacitor tri-level single electrode current module3Cathode of the anode as the second parallel branch, T3Current collection
Anode of the pole as the second parallel branch, the anode of first parallel branch, the anode of the second parallel branch and the second capacitor
C2Anode be connected with each other, the cathode of first parallel branch, the cathode of the second parallel branch and the second capacitor C2Cathode phase
It connects；Alternatively,
The T1Emitter and T2Collector be connected, T2Emitter and D1Cathode be connected to three level of striding capacitance
Another port B, D of monopolar current module1Anode and D2Cathode be connected, D2Anode as first parallel branch
Cathode, T1Anode of the collector as first parallel branch, first capacitor C1Anode respectively with T1Emitter with
T2Collector be connected, the C1Cathode respectively with D1Anode and D2Cathode be connected, T3Collector and D3Anode
It is connected to a port A, D of the striding capacitance tri-level single electrode current module3Sun of the cathode as the second parallel branch
Pole, T3Cathode of the emitter as the second parallel branch, the anode of the anode of first parallel branch, the second parallel branch
With the second capacitor C2Anode be connected with each other, the cathode of first parallel branch, the cathode of the second parallel branch and second are electric
Hold C2Cathode be connected with each other, wherein
The first capacitor C1Rated operational voltage UdcIt is approximately the second capacitor C2Rated operational voltage half, institute
State T1、T2、D1、D2It is all made of and is suitable for rated operational voltage for UdcSwitching device, the full control switching device unit T3Including one
A or multiple full control switching devices, wherein the multiple full control switching device is connected in series, the diode D3Including one
A or multiple diodes, wherein the multiple Diode series connection, wherein
There are the port voltage u of the striding capacitance tri-level single electrode current module between the port A and port BSM,
As the T1、T2、T3When being turned off, the port voltage u of the striding capacitance tri-level single electrode current moduleSMIt is approximately equal to
2Udc；
As the T1、T2、T3When being both turned on, the port voltage u of the striding capacitance tri-level single electrode current moduleSMBe approximately equal to-
2Udc；
As the T1Conducting and T2、T3Shutdown or the T2Conducting and T1、T3When shutdown, the striding capacitance tri-level single is extremely electric
The port voltage u of flow moduleSMIt is approximately equal to Udc；
As the T1Shutdown and T2、T3Conducting or the T2Shutdown and T1、T3When conducting, the striding capacitance tri-level single is extremely electric
The port voltage u of flow moduleSMIt is approximately equal to-Udc；
As the T1、T2Conducting and T3Shutdown or the T1、T2Shutdown and T3When conducting, the striding capacitance tri-level single is extremely electric
The port voltage u of flow moduleSMIt is approximately equal to 0.
2. striding capacitance tri-level single electrode current module according to claim 1, which is characterized in that the T1、T2、T3For
Inverse-impedance type controls electronic power switch device entirely.
3. striding capacitance tri-level single electrode current module according to claim 1, which is characterized in that the T1、T2、T3For
Inverse conductivity type controls electronic power switch device entirely, wherein it includes one that each inverse conductivity type controls electronic power switch device entirely
Freewheeling diode, the anode of each freewheeling diode control the emitter phase of electronic power switch device with corresponding inverse conductivity type entirely
Even, the cathode of each freewheeling diode is connected with the collector that corresponding inverse conductivity type controls electronic power switch device entirely.
4. striding capacitance tri-level single electrode current module according to claim 1, which is characterized in that flown by described across electricity
Hold the electric current i of tri-level single electrode current moduleSMDirection always from the port A flow into, and from the port B flow out.
5. a kind of monopolar current unsteady flow chain, which is characterized in that extremely electric including one or more concatenated striding capacitance tri-level singles
Flow module, the striding capacitance tri-level single electrode current module are three electricity of striding capacitance according to any one of claims 1-4
Flat monopolar current module.
6. a kind of modular multi-level converter, which is characterized in that including monopolar current unsteady flow chain as claimed in claim 5.
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| CN109120171B (en) * | 2017-06-22 | 2021-10-29 | 丰郅(上海)新能源科技有限公司 | Multi-level inverter system for generating power frequency alternating current under control of high-frequency switch |
| CN109120173B (en) * | 2017-06-22 | 2021-07-02 | 丰郅(上海)新能源科技有限公司 | Multilevel inverter topology structure |
| CN107612396B (en) * | 2017-09-27 | 2019-10-18 | 华北电力大学（保定） | MMC striding capacitance submodule capacitor voltage balance control method |
| CN108134384B (en) * | 2017-12-28 | 2020-06-02 | 清华大学 | Staggered connection soft switch hybrid multi-level direct current interconnected converter |
| CN109194172B (en) * | 2018-11-28 | 2019-08-13 | 阳光电源股份有限公司 | A kind of tri-level circuit and three-phase circuit |
| DE102019201720A1 (en) * | 2019-02-11 | 2020-08-13 | Vincotech Gmbh | Multi-stage flying capacitor converter module |
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