CN109347344A - A three-level combined fault-tolerant inverter circuit - Google Patents
A three-level combined fault-tolerant inverter circuit Download PDFInfo
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- CN109347344A CN109347344A CN201811200844.5A CN201811200844A CN109347344A CN 109347344 A CN109347344 A CN 109347344A CN 201811200844 A CN201811200844 A CN 201811200844A CN 109347344 A CN109347344 A CN 109347344A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- 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
公开一种三电平组合容错逆变电路，包括三相桥臂容错模块和变压器容错模块。利用变压器在逆变电路正常工作时对三相输出电压波形进行优化；故障后，将故障桥臂切除，可利用桥臂部分结构实现单臂、双臂、以及三臂故障容错；可利用变压器将两相电压合成三相进行输出，实现单相容错保证电路正常工作。三相电平逆变电路容错拓扑具有良好的容错功能，且控制与拓扑结构简单，易于实现。
A three-level combined fault-tolerant inverter circuit is disclosed, which includes a three-phase bridge arm fault-tolerant module and a transformer fault-tolerant module. The transformer is used to optimize the three-phase output voltage waveform when the inverter circuit is working normally; after the fault, the faulty bridge arm is removed, and the partial structure of the bridge arm can be used to achieve single-arm, double-arm and three-arm fault tolerance; the transformer can be used to The two-phase voltage is synthesized into three phases for output, and the single-phase fault tolerance is realized to ensure the normal operation of the circuit. The fault-tolerant topology of the three-phase level inverter circuit has a good fault-tolerant function, and the control and topology are simple and easy to implement.
Description
Technical field
The present invention relates to three-phase inverting circuit technologies, and in particular to one kind is by inverter circuit power bridge arm and transformer group
The novel reverse power transformation appearance of a street mistake topological structure of conjunction.
Background technique
Three-phase inverting circuit to realize that fault tolerance generally requires to increase more power tube to increase redundancy bridge arm, from
And implement faults-tolerant control in inverter circuit failure.Relative to two traditional level inverter circuits, multi-level inverter circuit has
Good error resilience performance, in this circuit, every kind of voltage vector has redundant vectors to guarantee the fault-tolerant operation of circuit.But
It is that power tube is more in multi-level inverter circuit, thus control is complex, and generally requires to set for fault is forward and backward
Different control strategies is counted, practical application is complex.It is very big that redundancy bridge arm often acts on not when circuit works normally, if
It is used only for backup failure bridge arm, does not only result in control strategy complexity, and increase economic cost.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of three level combinations fault-tolerant inverter circuit, including is used for
The fault-tolerant module of the three-phase bridge arm of a certain phase or multiphase bridge arm single tube or the fault tolerance of multitube failure is realized, and a certain mutually entire
After bridge arm breaks down, the fault-tolerant module of transformer of the output function of output three-phase voltage is realized by remaining quarter-phase circuit, wherein
The fault-tolerant module of three-phase bridge arm is divided into 4 bridge arms, and the first bridge arm is that middle site adjusts bridge arm, by top-down four
Power tube S1、S2、S3、S4With they and its respective anti-paralleled diode and clamp capacitor C composition；The collection of each power tube
The cathode of the reversed parallel diode of electrode, the anode of the reversed parallel diode of emitting stage form a power pipe unit, therefore,
Form four power pipe units being connected in series: power tube S altogether from top to bottom1Unit, S2Unit, S3Unit and S4Unit；Wherein,
From top to bottom, power tube S1Collector be connected with positive pole, power tube S1Transmitter and power tube S2Collector phase
Even, power tube S2Emitting stage and power tube S3Collector be connected, power tube S3Emitting stage and power tube S4Collector phase
Even, power tube S4Emitting stage ground connection；Also, the "+" end of clamp capacitor C and power tube S1Emitting stage connection, clamp capacitor C
"-" end and power tube S3Emitting stage connection；By power tube S2Emitting stage and power tube S3Collector between connection
Such tie point is known as " midpoint " of two power tubes by point below, is defined as point O；
Remaining three bridge arms are respectively three-phase output bridge arm in the fault-tolerant module of three-phase bridge arm, wherein A phase bridge arm from upper and
Under by power tube Sa1、Sa4、SA1、SA4And their own anti-paralleled diode composition, top-down four power is formed altogether
Pipe unit: power tube Sa1Unit, Sa4Unit, SA1Unit, SA4Unit, the connection type of four power pipe units and position among the above
The connection type that point adjusts bridge arm is identical；The power tube S that will be connected in seriesa1Unit and power tube Sa4Unit is known as A phase bridge arm
Upper bridge arm, the power tube cell S that will be connected in seriesA1With power tube SA4Unit is known as the lower bridge arm of A phase bridge arm；A point is upper bridge arm
Power tube Sa1、Sa4Midpoint, A point be lower bridge arm power tube SA1、SA4Midpoint；As the extension of upper bridge arm, filter inductance La、
Filter resistance RaIt is connected in series, in filter resistance RaA filter capacitor C in parallel afterwardsa；Also, filter inductance LaAnode and a point
It is connected, negative terminal and filter resistance RaIt is connected, filter resistance RaThe other end and filter capacitor CaAnode be connected, by filter capacitor
CaNegative terminal be defined as point O1；As the extension of lower bridge arm, filter inductance LA, filter resistance RAIt is connected in series, in filter resistance RAAfterwards
A filter capacitor C in parallelA；Wherein filter inductance LAAnode be connected with A point, negative terminal and filter resistance RAIt is connected, filtered electrical
Hinder RAThe other end and filter capacitor CAAnode be connected, by filter inductance CANegative terminal be defined as point O2；
It is identical that three-phase exports bridge arm structure；
Since three-phase bridge arm structure is identical, so having filter inductance L respectively in the upper bridge arm of B, C two-phaseb、Lc, filtered electrical
Hinder Rb、RcAnd filter capacitor Cb、Cc, all filter capacitor Ca、Cb、Cc"-" end be all connected to O1Point；Under B, C two-phase
There is filter inductance L in bridge arm respectivelyB、LC, filter resistance RB、RCAnd filter capacitor CB、CC, the filter capacitor of three-phase lower bridge arm
CA、CB、CC"-" end be all connected to O2Point；Bridge arm filter resistance R in A phaseaPass through connection transformer module and A phase load LoadA
With lower bridge arm RAIt is cascaded and constitutes circuit；
In the fault-tolerant module of three-phase bridge arm, defining U is the output voltage in A phase between bridge arm a point and O point, UAgIt is under A phase
Output voltage between bridge arm A point and grounding point g, Sa1-Sa6、SA1-SA66 power switch tubes of respectively upper and lower bridge arm；Three
Phase output voltage is superimposed by two parts circuit to work up and down respectively；Rx、Lx、Cx, X=a, b, c, A, B, C, respectively each phase bridge
Filter resistance, filter inductance and the filter capacitor of arm；In order to describe for the sake of simplicity, existing by the three-phase in the fault-tolerant module of three-phase bridge arm
The output respective upper bridge arm of bridge arm is referred to as three bridge arm of circuit top, and the three-phase output respective lower bridge arm of bridge arm is referred to as under circuit
Three bridge arm of portion；
The fault-tolerant module of transformer is two groups of three-phase transformers, and wherein there are two groups of taps on A phase winding pair side, and B phase winding has three
Group tap, C phase winding have four groups of taps；
Two transformer device structures of the fault-tolerant module of transformer are identical, wherein for the transformer being connected with upper bridge arm,
The primary side winding of three-phase transformer is by T1a、T1b、T1cThree windings composition, the "+" end of three windings respectively with upper bridge arm a, b, c
Filter resistance output end be connected, the "-" end of three windings and together with O1Point is connected；Transformer secondary winding is numerous, will
Successively illustrate, the vice-side winding of upper bridge arm transformer a phase is made of three taps, two groups of coils, and first is in three taps
"+", the last one is "-"；The vice-side winding of b phase is made of four taps, three groups of coils, and first is in four taps
"+", the last one is "-"；The vice-side winding of c phase is made of five tap four sets of coils, and first is in four taps
"+", the last one is "-"；The cathode and anode directions of lower bridge arm transformer secondary tap are therewith unlike upper bridge arm transformer
On the contrary, be first be "-" the last one be "+", remaining composition is all the same；Upper and lower bridge arm transformer secondary passes through the phase
Load, which connects, constitutes circuit.
In one particular embodiment of the present invention, in the fault-tolerant module of transformer, the former secondary no-load voltage ratio T of A phase winding1a∶
T2a1∶T2a2The former secondary no-load voltage ratio of=1: 1: 0.5, B phase winding C phase winding
Former secondary no-load voltage ratio
The coil ratio of two coils of the primary coil of the vice-side winding of upper bridge arm transformer a phase and secondary side is respectively T1a
∶T2a1∶T2a2=1: 1: 0.5；The primary coil of the vice-side winding of b phase and the coil ratio of three coils in secondary side are respectivelyThe coil of four coils of the primary coil of the vice-side winding of c phase and secondary side
Turn ratio is respectively
In one embodiment of the invention, the size and type of power tube, transformer, diode, capacitor, inductance, resistance
It number is determined by the output power of inverter circuit.
In one particular embodiment of the present invention, DC voltage source 270V, power tube select IGBT, filter inductance
La=2mH, filter capacitor Ca=40 μ F, filter resistance Ra=25m Ω.
The working method of the above-mentioned fault-tolerant inverter circuit of three level combinations is LoadA, and LoadB, LoadC are respectively that three-phase is negative
It carries, in the output of each phase, the load of circuit is connected by the transformer of upper and lower bridge arm；When circuit works normally, Mei Yixiang
The control signal of upper and lower bridge arm is different, need to select appropriate control signal according to different control methods；When bridge arm on a certain phase bridge arm
Or when lower bridge arm failure, circuit will cut off failure bridge arm, while the output of the normal bridge arm of the phase being added in the change of failure bridge arm
Depressor side, so that the failure bridge arm becomes the output of two level inverter circuits；
Table 1 is A phase switch state and A bridge arm output voltage relationship；As shown in table 1, A phase switch state and A bridge arm export
Voltage relationship can satisfy the output of three level and require, and 0 indicates that switch is in opening state in table 1, and 1 indicates that switch is off
State；
1 A phase switch state of table and A bridge arm output voltage relationship
When the fault-tolerant inverter circuit of three level combinations works normally, the output voltage of every phase is upper and lower bridge arm output voltage
Superposition exports three-phase sine-wave by filter capacitor and filter inductance；
When A phase upper half bridge arm breaks down, bridge arm in A phase is cut off from circuit, by bridge arm load access A in A phase
Phase lower bridge arm output end, A phase bridge arm is exported as two level inverter circuits at this time；Other mutually certain side bridge arms when breaking down,
Processing mode is similar；
When A, B phase upper half bridge arm break down, bridge arm in A, B phase is cut off from circuit, by bridge arm load access in A phase
A phase lower bridge arm output end, bridge arm load access B phase lower bridge arm output end in B phase；When other two-phase bridge arms break down, processing
Mode is similar；
When A, B, C phase upper half bridge arm break down, bridge arm in A, B, C phase is cut off from circuit, by bridge on A, B, C three-phase
Arm load access A, B, C three-phase lower bridge arm output end；When three-phase bridge arm breaks down, processing mode is similar；
When circuit A phase breaks down, by the entire circuit excision of A phase, the voltage reference signal of B, C two-phase is adjusted to phase
Advanced 90 ° of phase of the C of the voltage signal that position mutual deviation is 90 °, i.e. B phase；
When circuit B phase breaks down, by the entire circuit excision of B phase, the voltage reference signal of A, C two-phase is adjusted to phase
Advanced 90 ° of phase of the C of the voltage signal that position mutual deviation is 90 °, i.e. A phase；
When circuit C phase breaks down, by the entire circuit excision of C phase, the voltage reference signal of A, B two-phase is adjusted to phase
Advanced 90 ° of phase of the B of the voltage signal that position mutual deviation is 90 °, i.e. A phase.
The present invention optimizes three-phase output voltage waveform using transformer when inverter circuit is worked normally；Failure
Afterwards, failure bridge arm is cut off, two-phase voltage is synthesized into three-phase using transformer and is exported, guarantee that circuit works normally.Three
Phase three-level inverter circuit Fault-Tolerant Topology has good fault tolerance for single bridge arm failure, and controls and topological structure letter
It is single, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is inverse circuit topology structure figure of the present invention；
Fig. 2 is the fault tolerable circuit of inverter circuit single armed failure；
Fig. 3 is the fault tolerable circuit of inverter circuit both arms failure；
Fig. 4 is the fault tolerable circuit of three arm failure of inverter circuit；
Fig. 5 is A phase fault, and transformer module wiring diagram after topological structure fault-tolerant networks and excision A phase, wherein Fig. 5 (a) shows
A phase fault topology reconstruction scheme out, Fig. 5 (b) show A phase fault transformer side connection plan；
Fig. 6 is B phase fault, and transformer module wiring diagram after topological structure fault-tolerant networks and excision B phase, wherein Fig. 6 (a) shows
Circuit reconfiguration topology, Fig. 6 (b) show B phase fault transformer side connection plan after B phase is cut off out；
Fig. 7 is C phase fault, and transformer module wiring diagram after topological structure fault-tolerant networks and excision C phase, wherein Fig. 7 (a) shows
Circuit reconfiguration topology, Fig. 7 (b) show C phase fault transformer side connection plan after C phase is cut off out.
Specific embodiment
In order to which the purpose of the present invention, technical solution and advantage is more clearly understood, below in conjunction with drawings and examples,
The present invention will be described in further detail.
As shown in Figure 1, the main circuit topology of the fault-tolerant inverter circuit of three level combinations of the invention is divided into two modules, left lateral
It is divided into the fault-tolerant module of three-phase bridge arm, right-hand component is the fault-tolerant module of transformer, is indicated respectively with two dotted line frames.Two modules
Fault tolerance is different, can satisfy fault-tolerant operation when fault in the case of inverter circuit Various Complex.
It is divided into 4 bridge arms in the fault-tolerant module of three-phase bridge arm, the first bridge arm is that middle site adjusts bridge arm, by top-down
Four power tube S1、S2、S3、S4With they and its respective anti-paralleled diode and clamp capacitor C composition；Each power tube
The reversed parallel diode of collector cathode, the anode of the reversed parallel diode of emitting stage forms a power pipe unit, because
This, forms four power pipe units being connected in series: power tube S altogether from top to bottom1Unit, S2Unit, S3Unit and S4Unit；Its
In, from top to bottom, power tube S1Collector be connected with positive pole, power tube S1Transmitter and power tube S2Collector
It is connected, power tube S2Emitting stage and power tube S3Collector be connected, power tube S3Emitting stage and power tube S4Collector
It is connected, power tube S4Emitting stage ground connection；Also, the "+" end of clamp capacitor C and power tube S1Emitting stage (namely power tube
S2Collector) connection, the "-" end of clamp capacitor C and power tube S3Emitting stage (namely S4Collector) connection；By function
Rate pipe S2Emitting stage and power tube S3Collector between tie point (such tie point is known as two power tubes below
" midpoint ") be defined as point O.
Remaining three bridge arms are respectively three-phase output bridge arm in the fault-tolerant module of three-phase bridge arm, and three bridge arm structures are identical,
It is illustrated by taking A phase bridge arm as an example.A phase bridge arm is from top to bottom by power tube Sa1、Sa4、SA1、SA4And their own inverse parallel
Diode composition, forms top-down four power pipe units: power tube S altogethera1Unit, Sa4Unit, SA1Unit, SA4Unit,
The connection type of four power pipe units is identical with the adjusting connection type of bridge arm of site among the above, is not repeated.Wherein,
The power tube S that will be connected in seriesa1Unit and power tube Sa4Unit is known as the upper bridge arm of A phase bridge arm, the power pipe unit that will be connected in series
SA1With power tube SA4Unit is known as the lower bridge arm of A phase bridge arm.A point is upper bridge arm power tube Sa1、Sa4Midpoint, A point be lower bridge arm
Power tube SA1、SA4Midpoint.As the extension of upper bridge arm, filter inductance La, filter resistance RaIt is connected in series, in filter resistance RaAfterwards
A filter capacitor C in parallela；Wherein filter inductance LaAnode be connected with a point, negative terminal and filter resistance RaIt is connected, filtered electrical
Hinder RaThe other end and filter capacitor CaAnode be connected, by filter capacitor CaNegative terminal be defined as point O1.As prolonging for lower bridge arm
It stretches, filter inductance LA, filter resistance RAIt is connected in series, in filter resistance RAA filter capacitor C in parallel afterwardsA；Wherein filter inductance
LAAnode be connected with A point, negative terminal and filter resistance RAIt is connected, filter resistance RAThe other end and filter capacitor CAAnode phase
Even, by filter inductance CANegative terminal be defined as point O2。
Since three-phase bridge arm structure is identical, so having filter inductance L respectively in the upper bridge arm of B, C two-phaseb、Lc, filtered electrical
Hinder Rb、RcAnd filter capacitor Cb、Cc, all filter capacitor Ca、Cb、Cc"-" end meet i.e. O on one point1Point.In B, C two-phase
Lower bridge arm in have filter inductance L respectivelyB、LC, filter resistance RB、RCAnd filter capacitor CB、CC, the filtering of three-phase lower bridge arm
Capacitor CA、CB、CC"-" end connect in O2Point.Bridge arm filter resistance R in A phaseaPass through connection transformer module and A phase load
LoadA and lower bridge arm RAIt is cascaded and constitutes circuit.
In the fault-tolerant module of three-phase bridge arm, defining U is the output voltage in A phase between bridge arm a point and O point, UAgIt is under A phase
Output voltage between bridge arm A point and grounding point g, Sa1-Sa6、SA1-SA66 power switch tubes of respectively upper and lower bridge arm.Three
Phase output voltage is superimposed by two parts circuit to work up and down respectively.Rx、Lx、Cx(X=a, b, c, A, B, C) is respectively each phase bridge
Filter resistance, filter inductance and the filter capacitor of arm.In order to describe for the sake of simplicity, existing by the three-phase in the fault-tolerant module of three-phase bridge arm
The output respective upper bridge arm of bridge arm is referred to as three bridge arm of circuit top, and the three-phase output respective lower bridge arm of bridge arm is referred to as under circuit
Three bridge arm of portion.
The fault-tolerant module of transformer is two groups of three-phase transformers, and wherein there are two groups of taps, former secondary no-load voltage ratio T in A phase winding pair side1a∶
T2a1∶T2a2=1: 1: 0.5, B phase winding have three groups of taps, former secondary no-load voltage ratio
C phase winding has four groups of taps, former secondary no-load voltage ratio
Two transformer device structures of the fault-tolerant module of transformer are identical, describe by taking the transformer being connected with upper bridge arm as an example below
Its structure.The primary side winding of three-phase transformer is by T1a、T1b、T1cThree windings composition, the "+" end of three windings respectively with upper bridge
The filter resistance output end (anode of i.e. corresponding filter capacitor) of arm a, b, c is connected, the "-" end of three windings and together with O1
Point is connected.Transformer secondary winding is numerous, will successively be described in detail, and the vice-side winding of upper bridge arm transformer a phase is by three taps
Two groups of coil compositions, first is "+" in three taps, the last one is "-", the line of two coils of primary coil and secondary side
Enclosing turn ratio is respectively T1a∶T2a1∶T2a2=1: 1: 0.5；The vice-side winding of b phase is made of four taps, three groups of coils, at four
First is "+" in tap, the last one is "-", and the coil ratio of primary coil and three coils in secondary side is respectivelyThe vice-side winding of c phase is made of five tap four sets of coils, is taken out at four
First is "+" in head, the last one is "-", and the coil ratio of primary coil and four coils in secondary side is respectivelyThe lower bridge arm transformer unlike upper bridge arm transformer
The cathode and anode directions of secondary side tap in contrast, be first be "-" the last one be "+", remaining composition is all the same.Up and down
Bridge arm transformer secondary is connected by the load of the phase and constitutes circuit.
The present invention is the invention to power transformation line structure, wherein power tube, transformer, diode, capacitor, inductance, resistance
Size and model are determined by the output power of inverter circuit, so being not construed as limiting to it.In one embodiment of the invention,
DC voltage source is 270V, and power tube selects IGBT, filter inductance La=2mH, filter capacitor Ca=40 μ F, filter resistance Ra=
25mΩ)
LoadA, LoadB, LoadC are respectively threephase load, and in the output of each phase, load passes through upper and lower bridge arm transformer
Connection.When circuit works normally, the control signal of each phase upper and lower bridge arm is different, and it is suitable to be selected according to different control methods
Control signal.When bridge arm on a certain phase bridge arm or lower bridge arm failure, circuit will cut off failure bridge arm, while this is mutually normal
The output of bridge arm is added in the transformer side of failure bridge arm, so that the failure bridge arm becomes the output of two level inverter circuits.
The fault-tolerant module of three-phase bridge arm mainly realizes the fault tolerance of a certain phase or multiphase bridge arm single tube or multitube failure, and
After the fault-tolerant module of transformer mainly realizes that a certain mutually entire bridge arm breaks down, output three-phase electricity is realized by remaining quarter-phase circuit
The output function of pressure.
Table 1 is A phase switch state and A bridge arm output voltage relationship.As shown in table 1, A phase switch state and A bridge arm export
Voltage relationship can satisfy the output of three level and require, and 0 indicates that switch is in opening state in table 1, and 1 indicates that switch is off
State.
1 A phase switch state of table and A bridge arm output voltage relationship
When circuit as shown in Figure 1 works normally, the output voltage of every phase is the superposition of upper and lower bridge arm output voltage through filtering
Wave capacitor and filter inductance export three-phase sine-wave.
When the single-phase bridge arm of circuit breaks down, if A phase upper half bridge arm breaks down, topology reconstruction scheme as shown in Fig. 2,
Bridge arm in A phase is cut off from circuit, bridge arm load in A phase is accessed into A phase lower bridge arm output end, connection is represented by dashed line in figure
Line.A phase bridge arm is exported as two level inverter circuits at this time.Other mutually certain side bridge arm when breaking down processing mode it is identical,
Dotted line indication circuit reconstructs part.
When circuit two-phase bridge arm breaks down, if A, B phase upper half bridge arm break down, topology reconstruction scheme such as Fig. 3 institute
Show, bridge arm in A, B phase is cut off from circuit, bridge arm load in A phase is accessed into A phase lower bridge arm output end, uses dotted line table in figure
Show connecting line, bridge arm load access B phase lower bridge arm output end in B phase.
When circuit three-phase bridge arm breaks down, if A, B, C phase upper half bridge arm break down, topology reconstruction scheme such as Fig. 4
It is shown, bridge arm in A, B, C phase is cut off from circuit, by bridge arm load access A, B, C three-phase lower bridge arm output on A, B, C three-phase
It holds, connecting line is represented by dashed line in figure.
When circuit A phase breaks down, by the entire circuit excision of A phase, the voltage reference signal of B, C two-phase is adjusted to phase
Advanced 90 ° of phase of the C of the voltage signal that position mutual deviation is 90 °, i.e. B phase.Transformer module connects after topological structure fault-tolerant networks and excision A phase
Line is as shown in figure 5, be represented by dashed line connecting line in figure.
When circuit B phase breaks down, by the entire circuit excision of B phase, the voltage reference signal of A, C two-phase is adjusted to phase
Transformer module connects after advanced 90 ° of phase of the C of the voltage signal that position mutual deviation is 90 °, i.e. A phase, topological structure fault-tolerant networks and excision B phase
Line is as shown in fig. 6, be represented by dashed line connecting line in figure.
When circuit C phase breaks down, by the entire circuit excision of C phase, the voltage reference signal of A, B two-phase is adjusted to phase
Transformer module connects after advanced 90 ° of phase of the B of the voltage signal that position mutual deviation is 90 °, i.e. A phase, topological structure fault-tolerant networks and excision C phase
Line is as shown in fig. 7, be represented by dashed line connecting line in figure.
Claims (5)
1. a kind of fault-tolerant inverter circuit of three level combinations, including for realizing a certain phase or multiphase bridge arm single tube or multitube failure
The fault-tolerant module of three-phase bridge arm of fault tolerance is realized defeated with after a certain mutually entire bridge arm breaks down by remaining quarter-phase circuit
The fault-tolerant module of the transformer of the output function of three-phase voltage out, wherein
The fault-tolerant module of three-phase bridge arm is divided into 4 bridge arms, and the first bridge arm is that middle site adjusts bridge arm, by top-down four power
Pipe S1、S2、S3、S4With they and its respective anti-paralleled diode and clamp capacitor C composition；The collector of each power tube
The cathode of reversed parallel diode, the anode of the reversed parallel diode of emitting stage form a power pipe unit, therefore, from upper
And four power pipe units that lower total formation is connected in series: power tube S1Unit, S2Unit, S3Unit and S4Unit；Wherein, by upper
Under, power tube S1Collector be connected with positive pole, power tube S1Transmitter and power tube S2Collector be connected, function
Rate pipe S2Emitting stage and power tube S3Collector be connected, power tube S3Emitting stage and power tube S4Collector be connected, function
Rate pipe S4Emitting stage ground connection；Also, the "+" end of clamp capacitor C and power tube S1Emitting stage connection, the "-" of clamp capacitor C
End and power tube S3Emitting stage connection；By power tube S2Emitting stage and power tube S3Collector between tie point, below
Such tie point is known as to " midpoint " of two power tubes, is defined as a little 0；
In the fault-tolerant module of three-phase bridge arm remaining three bridge arms be respectively three-phase output bridge arm, wherein A phase bridge arm from top to bottom by
Power tube Sa1、Sa4、SA1、SA4And their own anti-paralleled diode composition, top-down four power tube lists are formed altogether
Member: power tube Sa1Unit, Sa4Unit, SA1Unit, SA4Unit, the connection type of four power pipe units and site tune among the above
The connection type for saving bridge arm is identical；The power tube S that will be connected in seriesa1Unit and power tube Sa4Unit is known as the upper of A phase bridge arm
Bridge arm, the power tube cell S that will be connected in seriesA1With power tube SA4Unit is known as the lower bridge arm of A phase bridge arm；A point is upper bridge arm power
Pipe Sa1、Sa4Midpoint, A point be lower bridge arm power tube SA1、SA4Midpoint；As the extension of upper bridge arm, filter inductance La, filtering
Resistance RaIt is connected in series, in filter resistance RaA filter capacitor C in parallel afterwardsa；Also, filter inductance LaAnode and a point phase
Even, negative terminal and filter resistance RaIt is connected, filter resistance RaThe other end and filter capacitor CaAnode be connected, by filter capacitor Ca
Negative terminal be defined as point O1；As the extension of lower bridge arm, filter inductance LA, filter resistance RAIt is connected in series, in filter resistance RAAfterwards simultaneously
A filter capacitor C is joinedA；Wherein filter inductance LAAnode be connected with A point, negative terminal and filter resistance RAIt is connected, filter resistance
RAThe other end and filter capacitor CAAnode be connected, by filter inductance CANegative terminal be defined as point O2；
It is identical that three-phase exports bridge arm structure；
Since three-phase bridge arm structure is identical, so having filter inductance L respectively in the upper bridge arm of B, C two-phaseb、Lc, filter resistance
Rb、RcAnd filter capacitor Cb、Cc, all filter capacitor Ca、Cb、Cc"-" end be all connected to O1Point；In the lower bridge of B, C two-phase
There is filter inductance L in arm respectivelyB、LC, filter resistance RB、RCAnd filter capacitor CB、CC, the filter capacitor C of three-phase lower bridge armA、
CB、CC"-" end be all connected to O2Point；Bridge arm filter resistance R in A phaseaBy connection transformer module and A phase load LoadA with
Lower bridge arm RAIt is cascaded and constitutes circuit；
In the fault-tolerant module of three-phase bridge arm, defining U is the output voltage in A phase between bridge arm a point and O point, UAgIt is A phase lower bridge arm
Output voltage between A point and grounding point g, Sa1-Sa6、SA1-SA66 power switch tubes of respectively upper and lower bridge arm；Three-phase is defeated
Voltage is superimposed by two parts circuit to work up and down respectively out；RX、LX、CX, X=a, b, c, A, B, C, respectively each phase bridge arm
Filter resistance, filter inductance and filter capacitor；In order to describe for the sake of simplicity, the existing three-phase by the fault-tolerant module of three-phase bridge arm exports
The respective upper bridge arm of bridge arm is referred to as three bridge arm of circuit top, and the three-phase output respective lower bridge arm of bridge arm is referred to as circuit lower part three
Bridge arm；
The fault-tolerant module of transformer is two groups of three-phase transformers, and wherein there are two groups of taps on A phase winding pair side, and B phase winding has three groups of pumpings
Head, C phase winding have four groups of taps；
Two transformer device structures of the fault-tolerant module of transformer are identical, wherein for the transformer being connected with upper bridge arm, three-phase
The primary side winding of transformer is by T1a、T1b、T1cThree winding compositions, the filter with upper bridge arm a, b, c respectively of the "+" end of three windings
Wave resistance output end be connected, the "-" end of three windings and together with O1Point is connected；Transformer secondary winding is numerous, will successively
Illustrating, the vice-side winding of upper bridge arm transformer a phase is made of three taps, two groups of coils, and first is "+" in three taps,
The last one is "-": the vice-side winding of b phase is made of four taps, three groups of coils, and first is "+" in four taps, most
The latter is "-"；The vice-side winding of c phase is made of five tap four sets of coils, and first is "+" in four taps, finally
One is "-"；The cathode and anode directions of lower bridge arm transformer secondary tap in contrast, are unlike upper bridge arm transformer
First be "-" the last one be "+", remaining composition is all the same；Upper and lower bridge arm transformer secondary is connected by the load of the phase
Get up to constitute circuit.
2. the fault-tolerant inverter circuit of three level combinations as described in claim 1, in the fault-tolerant module of transformer, the original of A phase winding
Secondary side no-load voltage ratio T1a∶T2a1∶T2a2The former secondary no-load voltage ratio of=1: 1: 0.5, B phase windingThe former secondary no-load voltage ratio of C phase winding
The coil ratio of two coils of the primary coil of the vice-side winding of upper bridge arm transformer a phase and secondary side is respectively T1a∶T2a1
∶T2a2=1: 1: 0.5；The primary coil of the vice-side winding of b phase and the coil ratio of three coils in secondary side are respectivelyThe coil of four coils of the primary coil of the vice-side winding of c phase and secondary side
Turn ratio is respectively
3. the fault-tolerant inverter circuit of three level combinations as claimed in claim 1 or 2, wherein power tube, transformer, diode, electricity
Appearance, inductance, the size of resistance and model are determined by the output power of inverter circuit.
4. the fault-tolerant inverter circuit of three level combinations as claimed in claim 3, wherein DC voltage source 270V, power tube choosing
With IGBT, filter inductance La=2mH, filter capacitor Ca=40 μ F, filter resistance Ra=25m Ω.
5. the working method of the fault-tolerant inverter circuit of three level combinations as described in claim 1 is LoadA, LoadB, LoadC points
Not Wei threephase load, in the output of each phase, the load of circuit is connected by the transformer of upper and lower bridge arm；When circuit works normally
When, the control signal of each phase upper and lower bridge arm is different, need to select appropriate control signal according to different control methods；When a certain phase bridge
Bridge arm or when lower bridge arm failure on arm, circuit will cut off failure bridge arm, while the output of the normal bridge arm of the phase is added in failure
The transformer side of bridge arm, so that the failure bridge arm becomes the output of two level inverter circuits；
Table 1 is A phase switch state and A bridge arm output voltage relationship；As shown in table 1, A phase switch state and A bridge arm output voltage
Relationship can satisfy the output of three level and require, and 0 indicates that switch is in opening state in table 1, and 1 indicates that switch is in an off state；
1 A phase switch state of table and A bridge arm output voltage relationship
When the fault-tolerant inverter circuit of three level combinations works normally, the output voltage of every phase is the superposition of upper and lower bridge arm output voltage
Three-phase sine-wave is exported by filter capacitor and filter inductance；
When A phase upper half bridge arm breaks down, bridge arm in A phase is cut off from circuit, it will be under bridge arm load access A phase in A phase
Bridge arm output end, A phase bridge arm is exported as two level inverter circuits at this time；Mutually certain side bridge arm is when breaking down for other, processing
Mode is similar；
When A, B phase upper half bridge arm break down, bridge arm in A, B phase is cut off from circuit, by bridge arm load access A phase in A phase
Lower bridge arm output end, bridge arm load access B phase lower bridge arm output end in B phase；When other two-phase bridge arms break down, processing mode
It is similar；
When A, B, C phase upper half bridge arm break down, bridge arm in A, B, C phase is cut off from circuit, bridge arm on A, B, C three-phase is born
Carry access A, B, C three-phase lower bridge arm output end；When three-phase bridge arm breaks down, processing mode is similar；
When circuit A phase breaks down, by the entire circuit excision of A phase, it is mutual that the voltage reference signal of B, C two-phase is adjusted to phase
Advanced 90 ° of phase of the C of the voltage signal that difference is 90 °, i.e. B phase；
When circuit B phase breaks down, by the entire circuit excision of B phase, it is mutual that the voltage reference signal of A, C two-phase is adjusted to phase
Advanced 90 ° of phase of the C of the voltage signal that difference is 90 °, i.e. A phase；
When circuit C phase breaks down, by the entire circuit excision of C phase, it is mutual that the voltage reference signal of A, B two-phase is adjusted to phase
Advanced 90 ° of phase of the B of the voltage signal that difference is 90 °, i.e. A phase.
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