CN108599540A - A kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer - Google Patents
A kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer Download PDFInfo
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- CN108599540A CN108599540A CN201810476242.6A CN201810476242A CN108599540A CN 108599540 A CN108599540 A CN 108599540A CN 201810476242 A CN201810476242 A CN 201810476242A CN 108599540 A CN108599540 A CN 108599540A
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-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of redundancy structures of cascaded H-bridges Three-phase electronic power transformer to include, input stage module, isolation level module and output level module, the three-phase input end of input stage module with the three of cascaded H-bridges Three-phase electronic power transformer for being connected, for failure intersection circulation to be turned to direct current output；The input terminal of isolation level module is connected with the output end of input stage module, and the direct current for exporting input stage module is converted into the direct current output of another amplitude, and realizes the electrical isolation of isolation level module both sides module；Output level module input terminal is connected with the output end of isolation level module, and output end is connected with the three-phase output end of cascaded H-bridges Three-phase electronic power transformer, and the direct current for exporting isolation level module is converted into the exchange output of corresponding failure phase.The three-phase of electronic power transformer shares a redundant module, and the minimum number of redundant module is reduced to one from three, significantly reduces redundancy cost.
Description
Technical field
The present invention relates to field of power electronics, are more particularly related to a kind of redundancy knot for electronic power transformer
Structure.
Background technology
Electronic power transformer, also referred to as solid-state transformer, electric power electric transformer, intelligent transformer etc. are a kind of
Novel power transformer.Electronic power transformer has the controllability, powerful of height, has broad application prospects.
Currently, medium-voltage network is concentrated mainly on to the research of electronic power transformer and application.Application scenario is main
Including rail traffic traction, new-energy grid-connected, high quality power supply etc..As electronic power transformer is in Practical Project
Using reliability, which is increasingly becoming, restricts one of its widely applied key factor.Major loop topology redundancy structure is common at present
A kind of promotion reliability method.
Redundancy scheme can be roughly divided into hot redundancy scheme and cold redundancy scheme.
Hot redundancy scheme refers to that under normal operating conditions, redundancy structure and other modules work together.When a failure
When generation, malfunctioning module is promptly isolated, and remaining health module continues to work.
Cold redundancy scheme refers to that redundancy structure is not involved in operation under normal circumstances, after malfunctioning module is isolated, redundancy
Structure just starts to charge up, puts into operation.
For cascaded H-bridges Three-phase electronic power transformer, in hot redundancy and cold redundancy scheme, one is at least needed per phase
Redundancy structure, i.e. three-phase need at least three redundancy structures, whole redundancy of high cost altogether.
Invention content
To solve disadvantage present in existing electronic power transformer redundancy scheme, the present invention provides a kind of novel grades
Join H bridge Three-phase electronic power transformer low cost redundancy structures, it is intended to it is of high cost to solve existing electronic power transformer redundancy
Problem.
To achieve the above object, the present invention provides a kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer, packet
It includes：
Input stage module, three-phase input end are used for for being connected with the three of cascaded H-bridges Three-phase electronic power transformer
When mutually some module breaks down certain in cascaded H-bridges Three-phase electronic power transformer, failure is intersected into circulationization direct current output；
Isolation level module, input terminal is connected with the output end of input stage module, straight for exporting input stage module
Circulation turns to the direct current output of another amplitude, and realizes the electrical isolation of isolation level module both sides module；And
Output level module, input terminal are connected with the output end of isolation level module, and output end is the same as cascaded H-bridges Three-phase electronic
Another three phase terminals of power transformer connect, for when some module hair in cascaded H-bridges Three-phase electronic power transformer phase
When raw failure, converts isolation level module output direct current to corresponding failure and mutually exchange output.
Preferably, input stage module includes：
Input stage switch circuit, three bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, the three-phase input of input stage switch circuit
Hold the three-phase input end as input stage module, the exchange of the same three bridge arm full-bridge circuits of three-phase output end of input stage switch circuit
Input terminal connects, and the DC output end of three bridge arm full-bridge circuits is connected with electric capacity of voltage regulation both ends；
Input stage switch circuit includes in parallel switching branches and third phase switch, and first switch branch includes concatenated the
One phase switchs and two-phase switch, the phase input terminal of one end of first switch branch as input stage module, first switch branch
The connecting pin of a phase input terminal of the other end on road as input stage module, the first phase switch and two-phase switch is as input stage
One phase input terminal of module, the output end of the both ends of electric capacity of voltage regulation as input stage module.
Preferably, input stage module includes：
Three bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, the ac input end of three bridge arm full-bridge circuits is as input stage module
Three-phase input end, the DC output ends of three bridge arm full-bridge circuits connects with electric capacity of voltage regulation both ends, the both ends conduct of electric capacity of voltage regulation
The output end of input stage module.
Preferably, input stage module includes：
Input stage switch circuit, two bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, the three-phase input of input stage switch circuit
The three-phase input end as input stage module, the output end of input stage switch circuit is held to be inputted with the exchange of two bridge arm full-bridge circuits
The DC output end of end connection, two bridge arm full-bridge circuits is connected with electric capacity of voltage regulation both ends；
Input stage switch circuit includes two switching branches, and switching branches include three switches of parallel connection；One switch branch
The three-phase input end on road is connected with the three-phase input end split-phase of another switching branches, and the output end of a switching branches is as defeated
Enter an output end of grade switching circuit, another output of the output end of another switching branches as input stage switch circuit
End.
Preferably, isolation level module includes：
Inverter circuit, input terminal of the input terminal as isolation level module, the direct current for exporting input stage module turn
It is changed to the exchange of specific frequency；
Isolating transformer, input terminal are connected with the output end of inverter circuit, and the exchange for exporting inverter circuit turns
It is changed to the exchange of another same frequency different voltages, and electrical isolation is carried out to two lateral circuit of isolating transformer；And
Rectification circuit, input terminal are connected with the output end of isolating transformer, and output end is defeated as isolation level module
Outlet, the exchange for exporting isolating transformer are converted to direct current.
Preferably, isolation level module further includes that transmission inductance and DC voltage-stabilizing capacitance, one end of inverter circuit pass through transmission
Inductance is connected with the input terminal of isolating transformer, and the other end of inverter circuit is directly connected with the input terminal of isolating transformer；Directly
The output end for flowing electric capacity of voltage regulation both ends with rectification circuit connects.
Preferably, inverter circuit and rectification circuit are two bridge arm full-bridge circuits.
Preferably, output level module includes：Two bridge arm full-bridge circuits and output stage switch circuit, two bridge arm full-bridge circuits
Input terminal of the DC terminal as output level module, exchange end one end of two bridge arm full-bridge circuits is the same as output stage switch circuit input end
The exchange end other end of connection, output stage switch circuit output end and two bridge arm full-bridge circuits constitutes the output of output level module
End；
Output stage switch circuit includes three switches, and three switch one end are connected with each other, and the other end of three switches is constituted
The output end of output stage switch circuit；Two bridge arm full-bridge circuits are for the direct current that isolation level exports to be converted into exchanging, output stage
Switching circuit is for switching redundancy structure access phase.
Preferably, output level module further includes：One end of filter inductance and filter capacitor, two bridge arm full-bridge circuits passes through filter
Wave inductance is connected with output stage switch circuit on one side, and filter capacitor one end is connected with the input terminal of output stage switch circuit, filtering
The capacitance other end is connected with the other end of two bridge arm full-bridge circuits.
Compared with prior art, beneficial effects of the present invention are：
1, redundancy cost can be greatly reduced in the present invention, and three-phase shares a redundancy structure, by the switch for controlling both sides
Switching carry out specific some module for substituting a certain phase in three-phase；
2, the present invention be electronic power transformer three-phase except redundancy, and hot redundancy scheme and cold redundancy scheme be
Redundant module is added in per phase, is the redundancy inside every phase.The overall structure of the present invention can be compatible with hot redundancy scheme and cold
Redundancy scheme after some module breaks down in certain phase can select that, using redundancy internal in every phase, this can also be controlled
Redundant module in the present invention is accessed failure phase, substitutes malfunctioning module by the switching switched in invention.
Description of the drawings
Fig. 1 is the circuit diagram of redundancy structure provided by one embodiment of the present invention；
Fig. 2 is the cascaded H-bridges Three-phase electronic power transformer configured with redundancy structure that another embodiment of the present invention provides
The structural schematic diagram of device；
Fig. 3 is the structural schematic diagram of isolation level module in the redundancy structure that another embodiment of the invention provides；
Fig. 4 is the structural schematic diagram of output level module in the redundancy structure that another embodiment of the invention provides；
Fig. 5 is the structural schematic diagram of two bridge arm full-bridge circuits in the redundancy structure that another embodiment of the invention provides；
Fig. 6 is the structural schematic diagram of input stage module in the redundancy structure that another embodiment of the invention provides；
Fig. 7 is the structural schematic diagram of three bridge arm full-bridge circuits in the redundancy structure that another embodiment of the invention provides；
Fig. 8 is overall structure diagram in the redundancy structure that another embodiment of the invention provides；
Fig. 9 is the structural schematic diagram of input stage module in the redundancy structure that another embodiment of the invention provides；
Figure 10 is overall structure diagram in the redundancy structure that another embodiment of the invention provides；
Figure 11 is the structural schematic diagram of input stage module in the redundancy structure that another embodiment of the invention provides；
Figure 12 is overall structure diagram in the redundancy structure that another embodiment of the invention provides.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
The shortcomings that overcome the prior art, the present invention provides a kind of cascaded H-bridges Three-phase electronic power transformer it is low at
This redundancy structure scheme and three kinds of embodiments, in this redundancy structure, three-phase shares a redundancy structure, passes through control appropriate
System, when some module breaks down in a certain phase of Three-phase electronic power transformer, redundancy structure can substitute failure mould in time
Block maintains the stable operation of Three-phase electronic power transformer.In this redundancy structure, it is only necessary to a redundancy structure, it can
The redundancy cost of electronic power transformer is greatly reduced.Present invention is generally directed to be cascaded H-bridges Three-phase electronic power transformer.
As illustrated in fig. 1 and 2, cascaded H-bridges Three-phase electronic power transformer is divided into A phase modules group, B phase modules group and C phase moulds
Block group includes multiple modules per phase module group, and one end of multiple modules is serially connected, and the other end of multiple modules is parallel with one another.
Parallel connected end per phase module group is in parallel, per series connection end one end of phase module group as the cascaded H-bridges Three-phase electronic power transformer
Corresponding phase end.The redundancy structure of cascaded H-bridges Three-phase electronic power transformer includes input stage module 1, isolation level module 2 and defeated
Go out grade module 3,1 three-phase input end of input stage module is for being connected with the three of cascaded H-bridges Three-phase electronic power transformer, i.e., defeated
Enter another port connection of each phase port with block coupled in series end in corresponding phase of grade module 1,2 input terminal of isolation level module is same
The output end of input stage module connects, and 3 input terminal of output level module is connected with the output end of isolation level module, output level module 3
Output end is connected with another three phase terminals of cascaded H-bridges Three-phase electronic power transformer, i.e., the output end of output level module 3 is the same as right
Answer wired in parallel end in phase in parallel.
Input stage module 1 is used for when same cascaded H-bridges Three-phase electronic Power Transformer Faults, and failure intersection circulation is turned to
Direct current output；Isolation level module 2 is used to convert the direct current that input stage module exports to the direct current output of another amplitude, and realizes
The electrical isolation of isolation level module both sides module；Output level module 3 is used for when with cascaded H-bridges Three-phase electronic Power Transformer Faults
When, it converts isolation level module output direct current to corresponding failure and mutually exchanges output.
The input terminal three-phase and output end three-phase of cascaded H-bridges electronic power transformer respectively with the input terminal of redundancy structure and
Output end is connected so that the input terminal of redundancy structure is connected to AC network or distributed generation resource, and the output end of redundancy structure connects
It is connected to the output end three phase network or load of electronic power transformer；Electronic power transformer three-phase shares a redundancy knot
Structure；Corresponding failure phase is switched to by input stage module so that failure intersection circulation is turned to direct current, supply event by input stage module
Hinder phase voltage ability to bear, while output level module switches to corresponding failure phase so that output level module converts direct current to event
Barrier mutually exchange output, realizes redundancy structure multiplexing, reduces cost.
As shown in figure 3, isolation level module includes that inverter circuit, transmission inductance, isolating transformer, rectification circuit and direct current are steady
Voltage capacitance；Input terminal of the inverter circuit input terminal as isolation level module, one end of inverter circuit is by transmitting inductance with isolation
The input terminal of transformer connects, and the other end of inverter circuit is directly connected with the input terminal of isolating transformer；Rectification circuit inputs
The output end with isolating transformer is held to connect, output end of the rectification circuit output end as isolation level module, DC voltage-stabilizing capacitance
Both ends are connected with the output end of rectification circuit.
Inverter circuit and rectification circuit are two bridge arm full-bridge circuits.The DC terminal of two bridge arm full-bridge circuits is as inversion electricity
The input terminal on road, the output end of the exchange ends of two bridge arm full-bridge circuits as inverter circuit.The DC terminal of two bridge arm full-bridge circuits
As the output end of rectification circuit, the input terminal of the exchange ends of two bridge arm full-bridge circuits as rectification circuit.
Inverter circuit is used to be converted to the direct current that input stage module exports the exchange of specific frequency, and isolating transformer is used for
The exchange that inverter circuit exports is converted into the exchanges of another same frequency different voltages, and to two lateral circuit of isolating transformer into
Row electrical isolation, rectification circuit are used to the exchange that isolating transformer exports being converted to direct current, by DC port to next
Grade --- output stage is powered.
As shown in figure 4, output level module includes：Two bridge arm full-bridge circuits, filter inductance, filter capacitor and output stage switch
Circuit, the input terminal of the DC terminals of two bridge arm full-bridge circuits as output level module, one end of two bridge arm full-bridge circuits passes through filter
Wave inductance is connected with output stage switch circuit on one side, and filter capacitor one end is connected with the input terminal of output stage switch circuit, filtering
The other end connection of the same two bridge arm full-bridge circuits of the capacitance other end, output stage switch circuit output end and two bridge arm full-bridge circuits
Exchange the output end that the end other end constitutes output level module.
Output stage switch circuit includes three switches, and three switch one end are connected with each other, and the other end of three switches is constituted
The output end of output stage switch circuit；Two bridge arm full-bridge circuits are for the direct current that isolation level exports to be converted into exchanging, output stage
Switching circuit accesses phase with switching redundancy structure.
The direct current input and output grade module of isolation level module output, and be power frequency by inversion by the transformation of two bridge arm H bridges
Sine wave AC.After filtered device, according to the difference of failure phase, the switching of three switches is controlled, by output level module
Output end accesses the output end of failure phase.
As shown in figure 5, two bridge arms full-bridge circuit provided by the invention includes two bridge arms in parallel, each bridge arm includes two
A concatenated switching tube, exchange end of the bridge arm both ends as two bridge arm full-bridge circuits, switching tube tie point is as two bridge arm full-bridges
The DC terminal of circuit.Convenient for mapping, the transistor in all attached drawings is chosen for IGBT, other classes are alternatively depending on actual conditions
The transistor of type, repeats no more later.
As shown in fig. 6, input stage module includes that input stage switch circuit, three bridge arms are complete in redundancy structure provided by the invention
Bridge circuit and DC voltage-stabilizing capacitance, the three-phase input end of the three-phase input end of input stage switch circuit as input stage module are defeated
The three-phase output end for entering grade switching circuit is connected with the ac input end of three bridge arm full-bridge circuits, the direct current of three bridge arm full-bridge circuits
Output end is connected with DC voltage-stabilizing capacitance both ends；
Input stage switch circuit includes in parallel switching branches and third phase switch, and first switch branch includes concatenated the
Two-phase switch and the first phase switch, the phase input terminal of one end of first switch branch as input stage module, first switch branch
The connecting pin of a phase input terminal of the other end on road as input stage module, two-phase switch and the first phase switch is as input stage
One phase input terminal of module, the output end of the both ends of DC voltage-stabilizing capacitance as input stage module.
As shown in fig. 7, three bridge arms full-bridge circuit provided by the invention includes three bridge arms in parallel, each bridge arm includes two
A concatenated switching tube, DC terminal of the bridge arm both ends as three bridge arm full-bridge circuits, switching tube tie point is as three bridges in bridge arm
The exchange end of arm full-bridge circuit.
In redundancy structure as shown in Figure 8, some module of a certain phase breaks down in Three-phase electronic power transformer
And after determining position, redundancy structure accesses circuit, instead of malfunctioning module.Assuming that i-th of module breaks down in A phases, hereafter with
It is illustrated for this.
After i-th of module breaks down in Three-phase electronic power transformer A phases, failure is positioned first, then
The switch of i-th of module front end is closed, and the switch of rear end disconnects, and malfunctioning module is isolated；Second phase in redundancy structure input stage
Switch SR_2 is closed, and the first phase switch SR_1 and third phase switch SR_3 are disconnected.Meanwhile IGBT is managed into three bridge arm full-bridge circuits
The control signal input of T1 to IGBT pipes T6 send out corresponding PWM wave signal so that the first two bridge arm connects in input stage module
Enter electronic power transformer A circuitry phases.Input stage module carries out rectification by H bridges to the exchange of input, exports direct current to isolation
Grade module.Isolation level module converts the direct current that input stage module exports to the direct current output of another amplitude, and realizes isolation level
The electrical isolation of module both sides module.The switch SR_4 of output stage is closed, and switch SR_5 and switch SR_6 are disconnected, by output stage mould
The output end of the output end access electronic power transformer A phases of block, the direct current that two bridge arm full-bridge circuits are used to export isolation level
It is converted into A phases and exchanges output.
In the above-described embodiments, redundancy structure is accessed into A circuitry phases, is equivalent to and redundancy structure is connected on electron electric power transformation
After device A n-th of module of phase, become (n+1)th module.It is isolated after i-th of module failure, redundancy structure input failure is mutually transported
Row, instead of malfunctioning module, to maintain the stable operation of electronic power transformer.
In redundancy structure as shown in Figure 9, three bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, the friendship of three bridge arm full-bridge circuits
Three-phase input end of the input terminal as input stage module is flowed, the DC output end of three bridge arm full-bridge circuits is the same as DC voltage-stabilizing capacitance two
End connection, the output end of the both ends of DC voltage-stabilizing capacitance as input stage module.
As shown in Figure 10, when in Three-phase electronic power transformer A phases i-th of module break down and after be isolated,
Different PWM wave signals is sent out by the signal input part of IGBT pipes T1 to from IGBT pipes T4 to three bridge arm full-bridge circuits, to
The signal input part of IGBT pipe T5 and IGBT pipes T6 sends out the identical PWM wave of PWM wave signal of same IGBT pipes T3 and IGBT pipe T4
Signal makes two bridge arms of B, C be operated in same state, and three bridge arms work at the same time, and the exchange of input is converted to direct current, and to every
It powers from grade.
As shown in figure 11, input stage module includes input stage switch circuit, two bridge arms in redundancy structure provided by the invention
Full-bridge circuit and DC voltage-stabilizing capacitance, the three-phase input end of the three-phase input end of input stage switch circuit as input stage module,
The output end of input stage switch circuit is connected with the ac input end of two bridge arm full-bridge circuits, and the direct current of two bridge arm full-bridge circuits is defeated
Outlet is connected with DC voltage-stabilizing capacitance both ends；
Input stage switch circuit includes two switching branches, and switching branches include three switches of parallel connection；One switch branch
The three-phase input end on road is connected with the three-phase input end split-phase of another switching branches, and the output end of a switching branches is as defeated
Enter an output end of grade switching circuit, another output of the output end of another switching branches as input stage switch circuit
End.
As shown in figure 12, when in Three-phase electronic power transformer A phases i-th of module break down and after be isolated, switch
SR_1, SR_8 and SR_9 are closed, and switch SR_2, SR_3, SR_7 are disconnected, and input stage module is accessed failure circuitry phase.Output
The switch SR_4 of grade is closed, and switch SR_5 and switch SR_6 are disconnected, and input stage module and output level module are accessed electron electric power
The output end of transformer A phases, by H bridges by the exchange conversion of input be direct current, export to isolation level.Entire redundancy structure is set to access
Failure phase substitutes transmission and transformation that malfunctioning module carries out electric energy.
The redundancy structure of electronic power transformer proposed by the present invention, when some mould in Three-phase electronic power transformer phase
When block breaks down, the switch in electronic power transformer is isolated by malfunctioning module.Redundancy in the structure proposed through the invention
The utilization of the special construction, switch and control signal of structure input stage and the switching control of output stage switch, redundancy structure energy
Malfunctioning module operation is enough substituted, the stability of Three-phase electronic power transformer operation is maintained.
In three embodiments of input stage module, one embodiment includes one group of switch, three bridge arm H bridges and DC voltage-stabilizing
Capacitance；Second embodiment includes three bridge arm H bridges and DC voltage-stabilizing capacitance；Third embodiment includes two groups of switches, two bridge arm H
Bridge and DC voltage-stabilizing capacitance.When redundancy structure puts into operation, signal is controlled by switching switch or bridge arm so that input side
Power grid or distributed generation resource give electrical energy transportation to input stage module by three-phase conducting wire.This redundancy structure is become by electron electric power
The three-phase of depressor shares a redundancy structure and also significantly reduces redundancy cost while ensureing reliability.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer, which is characterized in that including：
Input stage module, three-phase input end with the three of cascaded H-bridges Three-phase electronic power transformer for being connected, for working as grade
Mutually failure intersection circulation is turned to direct current output when breaking down to certain in connection H bridge Three-phase electronic power transformers by some module；
Isolation level module, input terminal are connected with the output end of input stage module, and the direct current for exporting input stage module turns
The direct current output of another amplitude is turned to, and realizes the electrical isolation of isolation level module both sides module；And
Output level module, input terminal are connected with the output end of isolation level module, and output end is the same as cascaded H-bridges Three-phase electronic electric power
Another three phase terminals of transformer connect, for when some module generation event in cascaded H-bridges Three-phase electronic power transformer phase
When barrier, converts isolation level module output direct current to corresponding failure and mutually exchange output.
2. redundancy structure as described in claim 1, which is characterized in that the input stage module includes：
The three-phase input end of input stage switch circuit, three bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, input stage switch circuit is made
Three-phase output end for the three-phase input end of input stage module, input stage switch circuit is inputted with the exchange of three bridge arm full-bridge circuits
The DC output end of end connection, three bridge arm full-bridge circuits is connected with electric capacity of voltage regulation both ends；
Input stage switch circuit includes that switching branches and third phase in parallel switch, and first switch branch includes concatenated first phase
Switch and two-phase switch, the phase input terminal of one end of first switch branch as input stage module, first switch branch
The connecting pin of a phase input terminal of the other end as input stage module, the first phase switch and two-phase switch is as input stage module
A phase input terminal, the output end of the both ends of electric capacity of voltage regulation as input stage module.
3. redundancy structure as described in claim 1, which is characterized in that the input stage module includes：
Three bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, the ac input ends of three bridge arm full-bridge circuits as input stage module three
The DC output end of phase input terminal, three bridge arm full-bridge circuits is connected with electric capacity of voltage regulation both ends, and the both ends of electric capacity of voltage regulation are as input
The output end of grade module.
4. redundancy structure as described in claim 1, which is characterized in that the input stage module includes：
The three-phase input end of input stage switch circuit, two bridge arm full-bridge circuits and DC voltage-stabilizing capacitance, input stage switch circuit is made
Output end for the three-phase input end of input stage module, input stage switch circuit connects with the ac input end of two bridge arm full-bridge circuits
It connects, the DC output end of two bridge arm full-bridge circuits is connected with electric capacity of voltage regulation both ends；
Input stage switch circuit includes two switching branches, and switching branches include three switches of parallel connection；One switching branches
Three-phase input end is connected with the three-phase input end split-phase of another switching branches, and the output end of a switching branches is as input stage
One output end of switching circuit, another output end of the output end of another switching branches as input stage switch circuit.
5. such as Claims 1-4 any one of them redundancy structure, which is characterized in that the isolation level module includes：
Inverter circuit, input terminal of the input terminal as isolation level module, the direct current for exporting input stage module are converted to
The exchange of specific frequency；
Isolating transformer, input terminal are connected with the output end of inverter circuit, and the exchange for exporting inverter circuit is converted to
Another exchange of same frequency different voltages, and electrical isolation is carried out to two lateral circuit of isolating transformer；And
Rectification circuit, input terminal are connected with the output end of isolating transformer, output end of the output end as isolation level module,
Exchange for exporting isolating transformer is converted to direct current.
6. redundancy structure as claimed in claim 5, which is characterized in that the isolation level module further includes transmission inductance and direct current
One end of electric capacity of voltage regulation, inverter circuit is connected by transmitting inductance with the input terminal of isolating transformer, the other end of inverter circuit
Directly connected with the input terminal of isolating transformer；DC voltage-stabilizing capacitance both ends are connected with the output end of rectification circuit.
7. redundancy structure as claimed in claim 6, which is characterized in that the inverter circuit and rectification circuit are that two bridge arms are complete
Bridge circuit.
8. redundancy structure as described in any one of claim 1 to 7, which is characterized in that the output level module includes：Two bridge arms
Full-bridge circuit and output stage switch circuit, the input terminal of the DC terminals of two bridge arm full-bridge circuits as output level module, two bridge arms
Exchange end one end of full-bridge circuit is connected with output stage switch circuit input end, and output stage switch circuit output end and two bridge arms are complete
The exchange end other end of bridge circuit constitutes the output end of output level module；
Output stage switch circuit includes three switches, and three switch one end are connected with each other, and the other end of three switches constitutes output
The output end of grade switching circuit；Two bridge arm full-bridge circuits are for the direct current that isolation level exports to be converted into exchanging, output stage switch
Circuit is for switching redundancy structure access phase.
9. redundancy structure as claimed in claim 8, which is characterized in that the output level module further includes：Filter inductance and filter
One end of wave capacitance, two bridge arm full-bridge circuits is connected by filter inductance with output stage switch circuit on one side, filter capacitor one end
Input terminal with output stage switch circuit connects, and the filter capacitor other end is connected with the other end of two bridge arm full-bridge circuits.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109450265A (en) * | 2018-10-11 | 2019-03-08 | 华中科技大学 | A kind of multimode redundancy structure of cascaded H-bridges Three-phase electronic power transformer |
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| CN113043893A (en) * | 2019-12-26 | 2021-06-29 | 奥动新能源汽车科技有限公司 | Charging system for battery changing station or energy storage station |
| CN113043893B (en) * | 2019-12-26 | 2022-04-01 | 奥动新能源汽车科技有限公司 | Charging system for battery changing station or energy storage station |
| CN111614277A (en) * | 2020-05-30 | 2020-09-01 | 青岛鼎信通讯股份有限公司 | Medium-high voltage integrated automobile charging system based on serial digital voltage stabilizer |
| CN111614277B (en) * | 2020-05-30 | 2022-07-29 | 青岛鼎信通讯股份有限公司 | Medium-high voltage integrated automobile charging system based on series digital voltage stabilizer |
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Application publication date: 20180928 |