CN109450265A - A kind of multimode redundancy structure of cascaded H-bridges Three-phase electronic power transformer - Google Patents
A kind of multimode redundancy structure of cascaded H-bridges Three-phase electronic power transformer Download PDFInfo
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- CN109450265A CN109450265A CN201811185407.0A CN201811185407A CN109450265A CN 109450265 A CN109450265 A CN 109450265A CN 201811185407 A CN201811185407 A CN 201811185407A CN 109450265 A CN109450265 A CN 109450265A
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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
- 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
-
- 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
- H02M5/4585—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 having a rectifier with controlled elements
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
-
- 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 multimode redundancy structures of cascaded H-bridges Three-phase electronic power transformer, it include: control module, its input terminal is connect with the three-phase series end of cascaded H-bridges Three-phase electronic power transformer, for when breaking down in electronic power transformer, the redundant module for controlling suitable number accesses each failure phase, substitutes malfunctioning module；N redundant module, the input terminal of each redundant module and an output end of control module connect, and the output end of each redundant module is different according to the difference of the low-side arrangement of electronic power transformer.Three-phase shares a redundancy structure in the present invention, is multiplexed by structure, used redundant module is less, while improving reliability, significantly reduces redundancy cost；Two kinds of redundancy structures proposed by the present invention, can be by adapting to the small size modification of redundant module output end the three-phase cascaded H-bridges electronic power transformer of different structure, and application scenarios are wider.
Description
Technical field
The present invention relates to power transformer technical fields, more particularly, to a kind of cascaded H-bridges Three-phase electronic power transformer
The multimode redundancy structure of device.
Background technique
Electronic power transformer has the advantages that high controllability, powerful, as a kind of novel electric power transformer
It is widely used in the occasions such as rail traffic traction, new-energy grid-connected, high quality power supply.Three-phase electronic power transformer by
Input stage, isolation level and output stage composition.Input stage converts the three-phase alternating current of input to the direct current of specific voltage, and isolation level will
The direct current of input stage output is converted to the direct current of another voltage, output stage by the direct current that isolation level exports be converted to specific voltage,
Frequency is exchanged with phase.Since the stress levels of IGBT are limited, it is often used cascaded H-bridges structure and promotes electronic power transformer height
Press the stress levels of side.And for low-pressure side, generalling use three kinds of structures --- separation DC bus structure, part are total to direct current mother
Cable architecture and common DC bus structure.
With the application of electronic power transformer in practical projects, reliability, which is increasingly becoming, restricts its widely applied pass
One of key factor.Major loop topology redundancy structure is a kind of currently used method for promoting reliability.Redundancy scheme can be divided into
Hot redundancy scheme and cold redundancy scheme: hot redundancy scheme refers to that under normal operating conditions redundancy structure and other modules are together
Work, when a fail occur, malfunctioning module is promptly isolated, and remaining health module continues to work；Cold redundancy side
Case refers to that redundancy structure is not involved in operation under normal circumstances, and after malfunctioning module is isolated, redundancy structure is just started to charge, thrown
Enter operation.
For the multimode failure that cascaded H-bridges Three-phase electronic power transformer may occur, the redundancy knot mostly used at present
Structure is that multiple redundant modules are arranged inside every phase and use cold redundancy or hot redundancy scheme.Under the redundancy structure, if considering redundancy k
A module, then three-phase needs 3k redundant module altogether, and whole redundancy is at high cost.
Summary of the invention
In view of the drawbacks of the prior art, at high cost it is an object of the invention to solve existing electronic power transformer redundancy
Technical problem.
To achieve the above object, the present invention provides a kind of multimode redundancies of cascaded H-bridges Three-phase electronic power transformer
Structure, the multimode redundancy structure include:
Control module, input terminal are connect with the three-phase series end of cascaded H-bridges Three-phase electronic power transformer, for when electricity
When breaking down in sub- power transformer, the redundant module for controlling suitable number accesses each failure phase, substitutes malfunctioning module；
N redundant module, the input terminal of each redundant module and an output end of control module connect, each redundant module
Output end is different according to the difference of the low-side arrangement of electronic power transformer.
Specifically, the redundant module is made of input stage, isolation level and output stage.
Specifically, the control module includes 1 input terminal, 2n group switching circuit and n output end；Wherein,
The input terminal includes three ports；
The output end includes two ports；
For the 1st output end~n-th output end, the corresponding one group of switching circuit of each output end, each output end is corresponding to be opened
Three switch compositions of powered-down routing, one end of three switches is connected to a bit, as the first port of each output end, the other end point
It is not connected with three ports of the input terminal of control module；
For the 1st output end~(n-1)th output end, each output end is connected by one group of switching circuit and next output end
It connects, the switching circuit between each output end and next output end is made of first switch and the second switch, first switch and second
One end of switch is connected to a bit, the second port as each output end；The of the other end of first switch and next output end
Single port is connected；The other end of second switch is connected with the second port of the n-th output end, and the second port of the n-th output end passes through
Three switches are connected with input terminal three-phase separate.
Specifically, each redundant module input stage is made of two bridge arm H-bridge circuits and DC voltage-stabilizing capacitor, two bridge arm H bridge electricity
Ac input end of the exchange end on road as input stage, DC voltage-stabilizing capacitor are parallel to two bridge arms of H-bridge circuit, capacitor both ends
It is connect with the DC terminal of two bridge arm H-bridge circuits, and the output end as redundant module input stage.
Specifically, control module includes 1 input terminal, 2n-1 group switching circuit and n in the multimode redundancy structure
Output end；Wherein,
The input terminal includes three ports；
The output end includes three ports；
For the 1st output end~n-th output end, the corresponding one group of switching circuit of each output end, each output end is corresponding to be opened
Three switch compositions of powered-down routing, successively split-phase is connected with input terminal three for one end of three switches, and the other end is as each output
First port, second port, the third port at end；
For the 1st output end~(n-1)th output end, each output end is connect by one group of switch with next output end, respectively
Switching circuit between output end and next output end is made of three switches, and three switch one end split-phases are connected with output end,
The other end is connect according to following rule with next output end split-phase: first port, second port, the third port of output end are distinguished
It is connect with the third port of next output end, first port, second port.
Specifically, the input stage of each redundant module is made of three bridge arm full-bridge circuits and DC voltage-stabilizing capacitor, and three bridge arms are complete
Ac input end of the exchange end of bridge circuit as input stage, DC voltage-stabilizing capacitor are parallel to three bridge arms of full-bridge circuit, electricity
Hold both ends to connect with the DC terminal of three bridge arm full-bridge circuits, and the output end as redundant module input stage.
Specifically, the isolation level of redundant module by inverter circuit, isolating transformer, rectification circuit, DC voltage-stabilizing capacitor with
And transmission inductance is constituted；
Inverter circuit, input terminal of the input terminal as isolation level, one end is by transmission inductance with the defeated of isolating transformer
Enter end connection, the other end is directly connected with the input terminal of isolating transformer, and the direct current for exporting redundant module input stage turns
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；
Rectification circuit, input terminal are connected with the output end of isolating transformer, output end of the output end as isolation level,
Exchange for exporting isolating transformer is converted to direct current；
DC voltage-stabilizing capacitor, both ends are connected with the output end of rectification circuit；
Inductance is transmitted, electric energy is used for transmission.
Specifically, the output stage of redundant module includes: that two bridge arm H-bridge circuits, filter inductance, filter capacitor and output stage are opened
Powered-down road；Filter inductance and capacitor composition LC filter, input terminal of the DC terminal of two bridge arm H-bridge circuits as output stage, two
One end of bridge arm H-bridge circuit is connected by filter inductance with output stage switch circuit on one side, and filter capacitor one end is opened with output stage
The input terminal on powered-down road connects, and the filter capacitor other end is connected with the other end of two bridge arm H-bridge circuits, and output stage switch circuit is defeated
The exchange end other end of outlet and two bridge arm H-bridge circuits constitutes the output end of output stage.
Specifically, output stage switch circuit includes three switches, and three switch one end are connected with each other, three switch it is another
End constitutes the output end of output stage switch circuit；Two bridge arm H-bridge circuits are used to the direct current that isolation level exports being converted into specific frequency
Rate, amplitude are exchanged with phase, and output stage switch circuit is for switching redundancy structure access phase.
Specifically, the output end of each redundant module according to the low-side arrangement of electronic power transformer it is different without
Together, specific as follows:
It separates under DC bus structure, each redundant module output stage is connected with electronic power transformer three-phase output end；Portion
Under separation DC bus structure, each redundant module isolation level passes through one group of switching circuit and each phase direct current of electronic power transformer
Bus is connected；Under common DC bus structure, each redundant module isolation level output end and each module isolation level of electronic power transformer
Output end shares a DC bus.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
(1) redundancy structure proposed by the present invention includes multiple redundant modules, the module in Three-phase electronic power transformer
When breaking down, the phase to be broken down by the redundant module access switched on-off suitable number, substitution malfunctioning module, three
A redundancy structure is mutually shared, is multiplexed by structure, used redundant module is less, while improving reliability, also greatly
Width reduces redundancy cost；
(2) present invention proposes two kinds of redundancy structures, can carry out modification by a small margin, to redundancy structure to adapt to different knots
The three-phase cascaded H-bridges structure electrical power transformer of structure, application scenarios are wider.
Detailed description of the invention
Fig. 1 is a kind of multimode redundancy structure schematic diagram of cascaded H-bridges Three-phase electronic power transformer provided by the invention；
Fig. 2 is the control module structural schematic diagram of redundancy structure I provided by the invention；
Fig. 3 is the input stage structural schematic diagram of the redundant module of redundancy structure I provided by the invention；
Fig. 4 is the isolation level structural schematic diagram of the redundant module of redundancy structure I provided by the invention；
Fig. 5 is the output stage structure schematic diagram of the redundant module of redundancy structure I provided by the invention；
Fig. 6 is the structural schematic diagram of two bridge arm H-bridge circuits in redundancy structure provided by the invention；
Fig. 7 is the overall structure diagram of redundancy structure I provided by the invention；
Fig. 8 is the control module structural schematic diagram of redundancy structure II provided by the invention；
Fig. 9 is the input stage structural schematic diagram of the redundant module of redundancy structure II provided by the invention；
Figure 10 is the overall structure diagram of redundancy structure II provided by the invention；
Figure 11 is the cascaded H-bridges Three-phase electronic electricity of the separation DC bus structure provided by the invention configured with redundancy structure
The structural schematic diagram of power transformer；
Figure 12 is the cascaded H-bridges three-phase electricity provided by the invention that be partially separated DC bus structure configured with redundancy structure
The structural schematic diagram of sub- power transformer；
Figure 13 is the cascaded H-bridges Three-phase electronic electric power of the common DC bus structure provided by the invention configured with redundancy structure
The structural schematic diagram of transformer.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention 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.
Fig. 1 is a kind of multimode redundancy structure schematic diagram of cascaded H-bridges Three-phase electronic power transformer provided by the invention.
As shown in Figure 1, multimode redundancy structure includes control module, n redundant module (1~redundant module of redundant module n).Control mould
The input terminal of block is connect with the three-phase series end of cascaded H-bridges Three-phase electronic power transformer, for when in electronic power transformer
When failure, the redundant module for controlling suitable number accesses each failure phase, substitutes malfunctioning module.The input terminal of each redundant module
It is connect with an output end of control module, the output end of each redundant module is according to the low-side arrangement of electronic power transformer
It is different and change, specific as follows:
It separates under DC bus structure, redundant module output stage is connected with electronic power transformer three-phase output end；Part
Separate under DC bus structure, only comprising input stage and isolation level structure, redundant module isolation level by one group of switching circuit with
Each phase DC bus of electronic power transformer is connected；It is each superfluous only comprising input stage and isolation level structure under common DC bus structure
Each mutually each module isolation level output end of complementary modul block isolation level output end and electronic power transformer with a DC bus phase
Even.
Input terminal of the input terminal of control module as redundancy structure, the output end of each redundant module is as redundancy structure
Output end.
When module breaks down in cascaded H-bridges Three-phase electronic power transformer, control module is by suitable number of redundancy
Module accesses each failure phase, substitutes malfunctioning module；Meanwhile electric energy is transferred to the redundant module to put into operation also by control module
In.
Redundant module be used for by the exchange of input be converted to specific frequency, amplitude (referred to alternating voltage virtual value, hereafter
In with DC voltage amplitude be referred to as amplitude together) exchange output with phase.Redundant module can be divided into input stage, isolation level
And output stage.Input stage is used to convert direct current output for the exchange of input；The direct current that isolation level is used to export input stage turns
The direct current output of another amplitude is turned to, and realizes the electrical isolation of two lateral circuit of isolation level；Isolation level is exported direct current by output stage
It is converted into corresponding failure mutually to exchange, and is output to corresponding failure phase.
Present invention is generally directed to cascaded H-bridges Three-phase electronic power transformers.Cascaded H-bridges electronic power transformer low-pressure side is pressed
DC bus structure can be divided into three types --- and separation DC bus is partially separated DC bus and common DC bus knot
Structure.Two kinds of redundancy structures proposed by the present invention can be applied in three kinds of structures.The redundant module of two kinds of redundancy structures every
It is identical with output stage structure from grade, and the input level structure of control module and redundant module has differences.Its redundancy principle and
Redundant operation process is close, therefore only to separate the operation of redundancy after the redundancy structure under bus structure, principle and failure
It is illustrated for journey.
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 split-phase is connected.The input terminal of redundancy structure is connected with the input terminal of each mutually each module, so that the input terminal of redundancy structure
It is connected to AC network or distributed generation resource；The output end of redundancy structure is in parallel with the output end of each mutually each module, redundancy structure
Output end be connected to AC network or load.Electronic power transformer three-phase shares a redundancy structure；By controlling mould
Suitable number of redundant module is accessed each failure phase by block, feeds failure phase input terminal voltage ability to bear, while redundant module
Output stage switches to corresponding failure phase, realizes the conversion and transmission of electric energy.It is multiplexed by structure, significantly reduces cost.
Fig. 2 is the control module structural schematic diagram of redundancy structure I provided by the invention.As shown in Fig. 2, in redundancy structure I
The input terminal of control module includes three ports A1, B1, C1, and the input terminal as redundancy structure.Control module has n a defeated
Outlet, each output end include two ports.Control module includes multiple groups switching circuit；
For the 1st output end~n-th output end, one end of three switches is connected to a bit, and first as each output end
The other end of port, three switches is connected with three ports of the input terminal of control module respectively.
For the 1st output end~(n-1)th output end, one end of two switches (first switch and the second switch) is connected to one
Point, the second port as each output end；The other end of first switch is connected with the first port of next output end；Second opens
The other end of pass is connected with the second port of the n-th output end, and the second port of the n-th output end passes through three switches and input terminal three
The connection of phase split-phase.
Fig. 3 is the input stage structural schematic diagram of the redundant module of redundancy structure I provided by the invention.As shown in figure 3, each superfluous
Complementary modul block input stage is made of two bridge arm H-bridge circuits and DC voltage-stabilizing capacitor.The exchange end of two bridge arm H-bridge circuits is as input stage
Ac input end, DC voltage-stabilizing capacitor is parallel to two bridge arms of H-bridge circuit, and capacitor both ends are straight with two bridge arm H-bridge circuits
Flow end connection, and the output end as redundant module input stage.
Fig. 4 is the isolation level structural schematic diagram of the redundant module of redundancy structure I provided by the invention.As shown in figure 4, redundancy
The isolation level of module includes inverter circuit, transmission inductance, isolating transformer, rectification circuit and DC voltage-stabilizing capacitor；Inverter circuit
One end of input terminal of the input terminal as redundant module isolation level, inverter circuit output end passes through the transmission same isolating transformer of inductance
Input terminal connection, the other end of inverter circuit output end directly with isolating transformer input terminal connect；Rectification circuit input
It holds and is connected with the output end of isolating transformer, output end of the rectification circuit output end as redundant module isolation level, DC voltage-stabilizing
Capacitor both ends are connected with the output end of rectification circuit.
Inverter circuit and rectification circuit are two bridge arm H-bridge circuits.The DC terminal of two bridge arm H-bridge circuits is as inverter circuit
Input terminal, output end of the exchange end of two bridge arm H-bridge circuits as inverter circuit.The DC terminal conduct of two bridge arm H-bridge circuits
The output end of rectification circuit, input terminal of the exchange end of two bridge arm H-bridge circuits as rectification circuit.
Inverter circuit is used to be converted to the direct current that input stage exports the exchange of specific frequency, and isolating transformer is used for will be inverse
The exchange for becoming circuit output is converted to the exchange of another same frequency different voltages, and carries out electricity to two lateral circuit of isolating transformer
Air bound is from rectification circuit is used to the exchange that isolating transformer exports being converted to direct current, is powered by DC port to output stage.
Fig. 5 is the output stage structure schematic diagram of the redundant module of redundancy structure I provided by the invention.As shown in figure 5, output
Grade includes: two bridge arm H-bridge circuits, filter inductance, filter capacitor and output stage switch circuit, and filter inductance and capacitor constitute LC filter
Wave device, input terminal of the DC terminal of two bridge arm H-bridge circuits as output stage, one end of two bridge arm H-bridge circuits passes through filter inductance
It is connected with output stage switch circuit on one side, filter capacitor one end is connected with the input terminal of output stage switch circuit, and filter capacitor is another
One end is connected with the other end of two bridge arm H-bridge circuits, and the exchange end of output stage switch circuit output end and two bridge arm H-bridge circuits is another
The output end of one end composition output stage.
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 H-bridge circuits are used to the direct current that isolation level exports being converted into specific frequency, amplitude
With exchanging for phase, output stage switch circuit accesses phase with switching redundancy structure.
Redundant module isolation level output direct current input redundant module output stage, and by two bridge arm H bridges transformation and
The filtering of filter is power frequency sine wave exchange by inversion.After LC filter filtering, according to the difference of failure phase, control
The switching for making three switches, by the output end of the output end access failure phase of output stage.
Fig. 6 is the structural schematic diagram of two bridge arm H-bridge circuits in redundancy structure provided by the invention.As shown in fig. 6, two bridge arms
H-bridge circuit includes two bridge arms in parallel, and each bridge arm includes two concatenated switching tubes, and bridge arm both ends are as two bridge arm H bridges
The DC terminal of circuit, exchange end of the switching tube tie point as two bridge arm H-bridge circuits.Two bridge arm H-bridge circuits are used for direct current and friendship
Mutual conversion between stream.Convenient for mapping, the switching tube in all attached drawings is chosen for IGBT, and regarding actual conditions can also be it
The switching tube of his type, repeats no more later.
Fig. 7 is the overall structure diagram of redundancy structure I provided by the invention.As shown in fig. 7, electronic power transformer
After multiple modules break down and determine abort situation in some in phase or multiple modules or multiphase, redundancy structure can pass through
The redundant module access failure phase of suitable number is maintained the stable operation of electronic power transformer instead of malfunctioning module by control.
It is next electric with three-phase cascaded H-bridges electronics for the working method and advantage for being illustrated more clearly that above-described embodiment
For single-phase single module, single-phase multimode, multiphase multimode block failure occur for power transformer, it is illustrated.
It is mutually made of m module it is assumed that three-phase cascaded H-bridges electronic power transformer is each.
When normal operation, SR1、SR2And SR3It is in closure, the of electronic power transformer m-th of module input of each phase
Two ports are connected to a bit, as neutral point.
When the single-phase single module failure of three-phase cascaded H-bridges electronic power transformer generation, it is with i-th of module failure in A phase
Example.
When module i breaks down and is detected, closing the switch before module i shields module i.Subsequent redundancy structure
Middle SR1_1Closure, SR1_2And SR1_3It disconnects, SR1_4Closure, SR1_5And SR1_6It disconnects, SR1_7It disconnects and SR1_8Closure.SR1It disconnects, SR2
And SR3Closure.The 2nd disconnects to other corresponding switches of n output end in control module.
At this point, redundant module 1 accesses failure phase --- A phase by the control of control module.The input terminal of redundant module with
The input terminal series connection of other modules in A phase, and redundant module output end parallel connection accesses A phase output terminal.Redundant module 1 inputs simultaneously
Second input terminal of grade and second input terminal of m-th of module of B, C two-phase are connected to a bit, as neutral point.
Redundant module accesses failure phase when thereby realizing single-phase single module failure.It is equivalent to and redundant module 1 is accessed into A
Phase becomes the m+1 module of A phase, and the module for working normally A circuitry phase is maintained at m, maintains electronic power transformer
Normal operation.
When single-phase multimode failure occurs for cascaded H-bridges Three-phase electronic power transformer, with i-th in A phase and j-th of mould
For block breaks down, when more module failures occur, the redundancy principle of substitution is identical as two module failures, therefore only
It is illustrated in case where two modules break down.
After breaking down, module i and the front end module j are closed the switch, and module i and module j is shielded.In redundancy structure,
SR1_1Closure, SR1_2And SR1_3It disconnects, SR1_4Closure, SR1_5And SR1_6It disconnects, SR1_7It is closed and SR1_8It disconnects.SR2_1、SR2_2With
SR2_3It disconnects, SR2_4Closure, SR2_5And SR2_6It disconnects, SR2_7It disconnects and SR2_8Closure.SR1It disconnects, SR2And SR3Closure.Control module
In the 3rd to corresponding other switching circuits disconnection of n output end.
At this point, redundant module 1 and 2 accesses failure phase --- A phase, the input stage and A phase of redundant module 1 and redundant module 2
Other module input stages series connection, and second port of 2 input stage of redundant module and m-th of module input stage of B, C two-phase
Second port is connected to a bit, as neutral point.It realizes redundant module 1 and redundant module 2 accesses A circuitry phase.It is equivalent to
M+1 and the m+2 module by redundant module 1 and 2 as A circuitry phase, the module for working normally A circuitry phase are maintained at m
It is a, maintain the normal operation of electronic power transformer.
When multiphase multimode block failure occurs for cascaded H-bridges Three-phase electronic power transformer, due to processing multiphase multimode block event
Barrier is identical as the every phase of the two-phase principle that has a module to break down is handled, thus only broken down with i-th of module of A phase and
J-th of module of B phase, which breaks down, be illustrated for redundancy substitution.
After breaking down, closing the switch before A phase module i and B phase module j shields module i and module j.Redundancy structure
In, SR1_1Closure, SR1_2And SR1_3It disconnects, SR1_4Closure, SR1_5And SR1_6It disconnects, SR1_7It disconnects and SR1_8Closure.SR2_1And SR2_3
It disconnects, SR2_2Closure, SR2_5Closure, SR2_4And SR2_6It disconnects, SR2_7It disconnects and SR2_8Closure.SR1And SR2It disconnects, SR3Closure.Control
The 3rd disconnects to other corresponding switching circuits of n output end in molding block.
At this point, redundant module 1 is accessed A phase by the switching of control switch, redundant module 2 is accessed into B phase, is realized
The substitution of single redundant module in two-phase.It is similar with previously described example when thering are multiple modules to break down in every phase, it will
SRi_7Closure disconnects SR(i+1)_1、SR(i+1)_2And SR(i+1)_3The cascade structure of redundant module is formed, then by each redundancy cascade structure
Each failure phase is accessed, realizes redundant module to the substitution of malfunctioning module.
Table 1
As shown in table 1, when including two redundant modules for above-described embodiment redundancy structure, control module switch on and off feelings
Condition.
Fig. 8 is the control module structural schematic diagram of redundancy structure II provided by the invention.As shown in figure 8, its input terminal by
Tri- port compositions of A1, B1, C1, successively with second port of the last one module input of Three-phase electronic power transformer three-phase
Connection；Its structure also includes n output end, and n is the quantity of redundant module in redundancy structure, and each output end is by three port sets
At.
For the 1st output end~n-th output end, the corresponding one group of switching circuit of each output end, each output end is corresponding to be opened
Three switch compositions of powered-down routing, successively split-phase is connected with input terminal three for one end of three switches, and the other end is as each output
First port, second port, the third port at end.
For the 1st output end~(n-1)th output end, each output end is connect by one group of switch with next output end.Respectively
Switching circuit between output end and next output end is made of three switches, and three switch one end split-phases are connected with output end,
The other end is connect according to following rule with next output end split-phase: the A phase of output end passes through switch and is connected with the C of next output end
It connects, the B phase of output end passes through switch and is connected with the A of next output end, and the C phase of output end passes through switch and next output end
B is connected.
Fig. 9 is the input stage structural schematic diagram of the redundant module of redundancy structure II provided by the invention.As shown in figure 9, superfluous
Complementary modul block input stage is made of three bridge arm full-bridge circuits and DC voltage-stabilizing capacitor.The exchange end of three bridge arm full-bridge circuits is as defeated
Enter the ac input end of grade, DC voltage-stabilizing capacitor is parallel to three bridge arms of full-bridge circuit, capacitor both ends and three bridge arm full-bridge electricity
The DC terminal on road connects, and the output end as redundant module input stage.
Figure 10 is the overall structure diagram of redundancy structure II provided by the invention.As shown in Figure 10, when three-phase cascaded H-bridges
After multiple modules break down and determine abort situation in some in electronic power transformer phase or multiphase, redundancy structure energy
It is enough that the redundant module access failure phase of suitable number is maintained instead of malfunctioning module by the steady of electronic power transformer by control
Fixed operation.
It is next electric with three-phase cascaded H-bridges electronics for the working method and advantage for being illustrated more clearly that above-described embodiment
For single-phase single module, single-phase multimode, multiphase multimode block failure occur for power transformer, it is illustrated.
When normal operation, it is closed SR1_1、SR1_2And SR1_3, and control the upper half bridge arm of three bridge arm of input stage of redundant module 1
It all turns on, as neutral point.Or neutral point can also be formed using the switching of the switch of control module.
When the single-phase single module failure of three-phase cascaded H-bridges electronic power transformer generation, it is with i-th of module failure in A phase
Example.
When module i breaks down and is detected, closing the switch before module i shields module i.Subsequent redundancy structure
Middle SR1_1、SR1_2And SR1_3Closure, SR1_4Closure, SR1_5And SR1_6It disconnects, other switches disconnect.
At this point, redundant module 1 accesses failure phase --- A phase by the control of control module.The input terminal of redundant module with
The input terminal series connection of other modules in A phase, and redundant module output end parallel connection accesses A phase output terminal.Meanwhile redundant module 1 is defeated
The corresponding bridge arm of B, C two for entering grade receives identical PWM wave signal, and on off operating mode is identical, is collectively formed with redundant module 1
Neutral point.Redundant module accesses failure phase when thereby realizing single-phase single module failure.It is equivalent to and redundant module 1 is accessed into A
Phase becomes the m+1 module of A phase, and the module for working normally A circuitry phase is maintained at m, maintains electronic power transformer
Stable operation.
When single-phase multimode failure occurs for cascaded H-bridges Three-phase electronic power transformer, with i-th in A phase and j-th of mould
For block breaks down, when more module failures occur, the redundancy principle of substitution is identical as two module failures, therefore only
It is illustrated in case where two modules break down.
After breaking down, closing the switch before module i and module j shields module i and module j.In redundancy structure,
SR1_1Closure, SR1_2And SR1_3It disconnects, SR1_4Closure, SR1_5And SR1_6It disconnects,.SR2_1It disconnects, SR2_2And SR2_3Closure, SR2_4It closes
It closes, SR2_5And SR2_6It disconnects.SR12_2Closure, SR12_1And SR12_3It disconnects.Other switches are off-state.
At this point, redundant module 1 and 2 accesses failure phase --- A phase, 1 input stage of redundant module uses the first two bridge arm, and superfluous
2 input stage of complementary modul block then uses three bridge arms.The input stage of redundant module 1 and 2 passes through switch SR1_1And SR12_2It connects into A circuitry phase
Input stage, the 2nd, 3 bridge arm of 2 input stage of redundant module work in identical on off operating mode, constitutes neutrality with redundant module 1
Point.It realizes redundant module 1 and redundant module 2 accesses A circuitry phase.It is equivalent to the m by redundant module 1 and 2 as A circuitry phase
+ 1 and the m+2 module, the module for working normally A circuitry phase is maintained at m, maintains the normal fortune of electronic power transformer
Row.
When multiphase multimode block failure occurs for cascaded H-bridges Three-phase electronic power transformer, due to multiphase multimode block failure feelings
Redundancy principle has a case where module breaks down similar with the every phase of two-phase under condition, therefore event only occurs with i-th of module of A phase
Barrier and j-th of module of B phase break down and be illustrated for redundancy substitution.
After breaking down, closing the switch before A phase module i and B phase module j shields module i and module j.Redundancy structure
In, SR1_1And SR1_3Closure, SR1_2It disconnects, SR1_4Closure, SR1_5And SR1_6It disconnects.SR2_1It disconnects, SR2_2And SR2_3Closure, SR2_5
Closure, SR2_4And SR2_6It disconnects.SR12_1And SR12_3It disconnects, SR12_2Closure.Other switches are in an off state.
At this point, redundant module 1 is accessed A phase by the switching of control switch, redundant module 2 is accessed into B phase, is realized
The substitution of single redundant module in two-phase.The first two bridge arm works in 1 input stage of redundant module, 2 input stage of redundant module three
Bridge arm works at the same time, and the 1st bridge arm and the 3rd bridge arm work are in identical on off operating mode.Three-phase passes through redundant module 1, redundancy
Module 2 and SR12_2Form neutral point.When every phase has multiple modules that redundancy is needed to substitute, the similar feelings with single-phase multimode failure
Condition first cascades required redundant module, then each cascade redundant module is accessed each failure phase.
As shown in table 2, when including two redundant modules for above-described embodiment redundancy structure, control module switch on and off feelings
Condition.
In redundancy structure I, corresponding two switching circuits of each output end of control module, each output end includes two ends
Mouthful, redundant module input stage includes two bridge arm H bridges and DC voltage-stabilizing capacitor；In redundancy structure II, each output of control module
A corresponding switching circuit is held, an output end is connected by one group of switching circuit with split-phase between next output end, each
Output end includes three ports, and redundant module input stage includes three bridge arm full-bridges and DC voltage-stabilizing capacitor.When redundancy structure is put into
When operation, by the switching of the switch in control module and redundant module output stage, corresponding redundant module accesses each failure
Phase.This redundancy structure shares a multimode redundancy structure by the three-phase of electronic power transformer, is multiplexed by structure,
While improving reliability, redundancy cost is also significantly reduced.
Table 2
Figure 11 is the cascaded H-bridges Three-phase electronic electricity of the separation DC bus structure provided by the invention configured with redundancy structure
The structural schematic diagram of power transformer.As shown in figure 11, cascaded H-bridges Three-phase electronic power transformer is divided into A phase module group, B phase mould
Block group and C phase module group, every phase module group include multiple modules, and one end of multiple modules is serially connected, multiple modules it is another
It holds parallel with one another.The parallel connected end of every phase module group is in parallel, and series connection end one end of every phase module group is as the cascaded H-bridges Three-phase electronic
Power transformer corresponds to phase end.The redundancy structure of cascaded H-bridges Three-phase electronic power transformer includes control module, redundant module
1 ... redundant module n.
The input terminal of control module is used to connect with the three-phase series end of cascaded H-bridges Three-phase electronic power transformer, each superfluous
The input terminal of complementary modul block and an output end of control module connect, output end and Three-phase electronic power transformer output terminal three-phase
It is in parallel.The structure of redundant module includes input stage, isolation level, output stage.
The input terminal of redundant module input stage is used for control module one output end connection, redundant module isolation level it is defeated
The output end for entering end with redundant module input stage connects, the output of the input terminal of redundant module output stage with redundant module isolation level
The output end of end connection, output stage is connected with the three-phase output end of electronic power transformer, i.e., the output end of output stage is the same as corresponding
Wired in parallel end is in parallel in failure phase.
Figure 12 is the cascaded H-bridges three-phase electricity provided by the invention that be partially separated DC bus structure configured with redundancy structure
The structural schematic diagram of sub- power transformer.As shown in figure 12, it is partially separated under DC bus structure, redundant module isolation level grade is logical
One group of switching circuit is crossed to be connected with each phase DC bus of electronic power transformer.
Figure 13 is the cascaded H-bridges Three-phase electronic electric power of the common DC bus structure provided by the invention configured with redundancy structure
The structural schematic diagram of transformer.As shown in figure 13, each superfluous only comprising input stage and isolation level structure under common DC bus structure
Each mutually each module isolation level output end of complementary modul block isolation level output end and electronic power transformer with a DC bus phase
Even.
As it will be easily appreciated by one skilled in the art that the above is merely preferred embodiments of the present invention, not to limit
The present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of multimode redundancy structure of cascaded H-bridges Three-phase electronic power transformer, which is characterized in that the multimode redundancy
Structure includes:
Control module, input terminal are connect with the three-phase series end of cascaded H-bridges Three-phase electronic power transformer, for when electronics electricity
When breaking down in power transformer, the redundant module for controlling suitable number accesses each failure phase, substitutes malfunctioning module；
N redundant module, the input terminal of each redundant module and an output end of control module connect, the output of each redundant module
It holds different according to the difference of the low-side arrangement of electronic power transformer.
2. multimode redundancy structure as described in claim 1, which is characterized in that the redundant module is by input stage, isolation level
It is constituted with output stage.
3. multimode redundancy structure as claimed in claim 2, which is characterized in that the control module includes 1 input terminal, 2n
Group switching circuit and n output end；Wherein,
The input terminal includes three ports；
The output end includes two ports；
For the 1st output end~n-th output end, the corresponding one group of switching circuit of each output end, the corresponding switch of each output end is electric
Route three switches composition, one end of three switches are connected to a bit, as the first port of each output end, the other end respectively with
Three ports of input terminal of control module are connected；
For the 1st output end~(n-1)th output end, each output end is connect by one group of switching circuit with next output end, respectively
Switching circuit between output end and next output end is made of first switch and the second switch, first switch and the second switch
One end is connected to a bit, the second port as each output end；The first port of the other end of first switch and next output end
It is connected；The other end of second switch is connected with the second port of the n-th output end, and the second port of the n-th output end is opened by three
Pass is connected with input terminal three-phase separate.
4. multimode redundancy structure as claimed in claim 3, which is characterized in that each redundant module input stage is by two bridge arm H bridges
Circuit and DC voltage-stabilizing capacitor are constituted, ac input end of the exchange end of two bridge arm H-bridge circuits as input stage, DC voltage-stabilizing electricity
Hold two bridge arms for being parallel to H-bridge circuit, capacitor both ends are connect with the DC terminal of two bridge arm H-bridge circuits, and as redundant module
The output end of input stage.
5. multimode redundancy structure as claimed in claim 2, which is characterized in that control module in the multimode redundancy structure
Include 1 input terminal, 2n-1 group switching circuit and n output end；Wherein,
The input terminal includes three ports；
The output end includes three ports；
For the 1st output end~n-th output end, the corresponding one group of switching circuit of each output end, the corresponding switch of each output end is electric
Three switch compositions are routed, successively split-phase is connected with input terminal three for one end of three switches, and the other end is as each output end
First port, second port, third port；
For the 1st output end~(n-1)th output end, each output end is connect by one group of switch with next output end, each to export
Switching circuit between end and next output end is made of three switches, and three switch one end split-phases are connected with output end, another
End is connect according to following rule with next output end split-phase: the first port of output end, second port, third port are respectively under
The third port of one output end, first port, second port connection.
6. multimode redundancy structure as claimed in claim 5, which is characterized in that the input stage of each redundant module, by three bridge arms
Full-bridge circuit and DC voltage-stabilizing capacitor are constituted, ac input end of the exchange end of three bridge arm full-bridge circuits as input stage, direct current
Electric capacity of voltage regulation is parallel to three bridge arms of full-bridge circuit, and capacitor both ends are connect with the DC terminal of three bridge arm full-bridge circuits, and conduct
The output end of redundant module input stage.
7. multimode redundancy structure as claimed in claim 2, which is characterized in that the isolation level of redundant module by inverter circuit,
Isolating transformer, rectification circuit, DC voltage-stabilizing capacitor and transmission inductance are constituted；
Inverter circuit, input terminal of the input terminal as isolation level, one end is by transmission inductance with the input terminal of isolating transformer
Connection, the other end are directly connected with the input terminal of isolating transformer, and the direct current for exporting redundant module input stage is 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；
Rectification circuit, input terminal are connected with the output end of isolating transformer, and output end of the output end as isolation level is used for
The exchange that isolating transformer exports is converted into direct current；
DC voltage-stabilizing capacitor, both ends are connected with the output end of rectification circuit；
Inductance is transmitted, electric energy is used for transmission.
8. multimode redundancy structure as claimed in claim 2, which is characterized in that the output stage of redundant module includes: two bridge arm H
Bridge circuit, filter inductance, filter capacitor and output stage switch circuit；Filter inductance and capacitor constitute LC filter, two bridge arm H bridges
Input terminal of the DC terminal of circuit as output stage, one end of two bridge arm H-bridge circuits is by filter inductance with output stage switch electricity
The connection of road one end, filter capacitor one end are connected with the input terminal of output stage switch circuit, and the filter capacitor other end is the same as two bridge arm H bridges
The other end of circuit connects, and the exchange end other end of output stage switch circuit output end and two bridge arm H-bridge circuits constitutes output stage
Output end.
9. multimode redundancy structure as claimed in claim 8, which is characterized in that output stage switch circuit includes three switches,
Three switch one end are connected with each other, and the other end of three switches constitutes the output end of output stage switch circuit；Two bridge arm H-bridge circuits
Direct current for exporting isolation level is converted into exchanging for specific frequency, amplitude and phase, and output stage switch circuit is for switching
Redundancy structure accesses phase.
10. multimode redundancy structure as claimed in claim 2, which is characterized in that the output end of each redundant module according to
The difference of the low-side arrangement of electronic power transformer and it is different, it is specific as follows:
It separates under DC bus structure, each redundant module output stage is connected with electronic power transformer three-phase output end；Part point
From under DC bus structure, each redundant module isolation level passes through one group of switching circuit and each phase DC bus of electronic power transformer
It is connected；Under common DC bus structure, each redundant module isolation level output end and each module isolation level of electronic power transformer are exported
It holds and shares a DC bus.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112039187A (en) * | 2019-06-03 | 2020-12-04 | 纬颖科技服务股份有限公司 | Control method for power supply system and power supply system |
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