CN110518820A - A kind of fault tolerant control method and system of T-type three-level inverter open-circuit fault - Google Patents
A kind of fault tolerant control method and system of T-type three-level inverter open-circuit fault Download PDFInfo
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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
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Abstract
The invention discloses a kind of diagnosis of T-type three-level inverter open-circuit fault and fault-tolerant operation method and systems, including using the control T-type three-level inverter operation of 7 segmentation SVPWM modulation systems first, inverter leg output and DC side mid-point voltage are sampled simultaneously, it obtains its low-frequency voltage signal and is coordinately transformed, obtain the equivalent output voltage vector track of inverter, by calculating the voltage vector track under different faults situation and operating status, establish fault eigenvalue truth table, and according to the characteristic value of current system and fault eigenvalue truth table, the current fault type of judgement system, finally switch corresponding control program, utilize redundant vectors equivalence replacement method, realize T-type three-level inverter fault-tolerant operation.
Description
Technical field
The present invention relates to the faults-tolerant control field of T-type three-level inverter, particularly relates to a kind of T-type three-level inverter and open
The fault tolerant control method and system of road failure.
Background technique
T-type three-level inverter has the fault-tolerant operation ability under certain fault conditions, electric system, aerospace,
There is very extensive application in the fields such as metallurgical mining industry, rail traffic.These occasions require high, length to the power supply continuity of power supply
The power-off of time may cause heavy economic losses or accident, this proposes T-type three-level inverter long-term stable work
Requirements at the higher level.Fault-tolerant operation of the inverter in partial fault can improve to big degree the power supply continuity of system.It is inverse
Become device and realizes that the premise of fault-tolerant operation is out of order into system diagnostics and fast implements the switching of control program.Currently, three level of T-type
The greatest problem of the fault diagnosis research of inverter is how quickly and accurately to be diagnosed to be various types of failures, subtract simultaneously
Wrong diagnosis caused by few load changes.
In the Alternating Current Governor System of industrial application, damage of most of failure from power device.Device fault includes
Short trouble and open-circuit fault, short trouble is short there are the time, can convert short trouble in quick acting fuse implantation circuit
For open-circuit fault.When single switching transistor open-circuit fault occurs for T-type three-level inverter, it may appear that output electric current, voltage waveform
Distortion, DC side mid-point potential offset, the abnormal conditions such as power device fever.Currently, institute on IGBT open-circuit fault diagnostic method
The research of expansion mainly has expert system approach, electric current testing and three kinds of voltage detecting method.Wherein current method is the most commonly used
A kind of method.Output voltage current waveform distortion when traditional diagnostic method is using inverter open-circuit fault is as judging fault bit
The foundation set, these methods can generate biggish wrong diagnosis when loading switching or mutating, and to load balance
Degree, power factor command are more harsh.
Summary of the invention
It is a primary object of the present invention to propose a kind of diagnosis of T-type three-level inverter open-circuit fault and fault tolerant control method
And system, it is able to solve in the prior art, fault-tolerant control system diagnostic method can not be suitable for various payload sizes, load function
The problem of rate factor and laod unbalance are spent.
The present invention adopts the following technical scheme:
A kind of fault tolerant control method of T-type three-level inverter open-circuit fault, which comprises the following steps:
Step 1: system is using the control T-type three-level inverter operation of 7 segmentation SVPWM modulation systems；
Step 2: bridge arm output and the DC side mid-point voltage of sampling T-type three-level inverter obtain its low-frequency voltage letter
Number；
Step 3: low-frequency voltage signal being coordinately transformed to obtain the equivalent output voltage vector track of inverter；
Step 4: calculating the voltage vector track under different faults situation and operating status, establish fault eigenvalue true value
Table；
Step 5: according to the characteristic value of current system and fault eigenvalue truth table, judging the current failure classes of system
Type；
Step 6: according to fault type, switching corresponding control program, realize T-type three-level inverter fault-tolerant operation.
Preferably, the step 1 specifically includes the following steps:
Step 1.1: its phase voltage output equation is obtained according to three-phase T-type three-level inverter topology circuit:
X ∈ { A, B, C }, S in formulaA1=1 indicates No. 1 pipe conducting of A phase, SA1=0 indicates No. 1 pipe shutdown of A phase, udcRepresent T-type
Three-level inverter DC side busbar voltage；
Step 1.2: calculate the three-phase voltage vector space distribution equation of T-type three-level inverter output:
In formula, SA,SB,SC∈ { 1,0, -1 }, SAIt takes 1 to represent A phase and exports high level udc/ 2,0 represents output intermediate level ,-
1 represents output low level-udc/2；
Step 1.3: the output voltage vector point of three-level inverter is drawn according to three-phase voltage vector space distribution equation
Butut；
Step 1.4: calculating current reference voltage vector VrefSection in voltage vector distribution map；
Step 1.5: SVPWM modulation is carried out, according to VrefLocating sector calculates vector sequence and effect in switch periods
Time.
Preferably, in the step 1.5, according to VrefLocating sector calculates vector sequence and effect in switch periods
Guarantee that only a phase bridge arm carries out state switching when time includes: each vectors switching in switch periods, and every phase is in a cycle
Inside only switch twice；First vector sum the last one vector in using the short vector of negative polarity as a switch periods, guarantees
At most there is a bridge arm to need switching state when small sector switch；Positive and negative short vector in each big sector is for midpoint electricity
The offset effect of position will cancel out each other.
Preferably, in the step 2, bridge arm output and the DC side mid-point voltage of the T-type three-level inverter pass through
Low-pass filter obtains the low-frequency voltage signal.
Preferably, in the step 3, the coordinate is transformed to Clark transformation, formula are as follows:
uα、uβRespectively component of the voltage vector in α axis direction and β axis direction, uAO、uBO、uCOFor T-type three-level inverter
Voltage between three-phase bridge arm output terminals A, 3 points of B, C and DC side midpoint O.
Preferably, the step 4, specifically includes:
Step 4.1: calculating the current path under various open fault conditions, analyze the variation of phase voltage under each open-circuit fault
Rule；
Step 4.2: inverter output voltage vector distribution map is modified according to the changing rule of phase voltage；
Step 4.3: the sequence acted on according to vector in each small sector and time calculate and each open under current failure type
The equivalent voltage vector in the period is closed, corresponding distortion track is drawn out；
Equipollent vectors accounting equation under fault condition are as follows:
V in formulacalFor distorted voltage vector, VrefFor reference voltage vector, VkFor k-th breakdown switch state in the period
Offset vector, ηkFor the action time accounting of k-th of breakdown switch state in the period, k value 1 to 7；
S44: being plotted in the case of each modulation degree, and the corresponding distortion track of various fault conditions extracts the spy of each track
Value indicative, the direction of degree and distortion including distortion, obtains fault eigenvalue truth table.
Preferably, the step 5 specifically includes: computing system current characteristic value A and θ, A and θ are respectively average voltage
The mould and phase angle of vector；
The calculation formula of A are as follows:
The calculation formula of θ are as follows:
N is T-type Three-Level Inverter System in the sampling number in a power frequency period.
Preferably, the step 6 specifically includes:
Step 6.1: the remaining effective voltage vector of T-type three-level inverter under current failure is calculated according to fault type；
Step 6.2: according to the remaining effective voltage vector of gained, judging whether T-type three-level inverter has fault-tolerant fortune
Capable ability；
Step 6.3: calculating the failure conditions of switch state in switch periods, draw the effective output voltage arrow of current inverter
Measure areal map；If effective output voltage vector range reduces, and modulation degree > 0.5, then modulation degree pressure is adjusted to effective output
Within the scope of voltage vector, drop volume fault-tolerant operation is carried out；If effective output voltage vector range is constant, it is able to carry out in full fault-tolerant
Operation；
Step 6.4: vector sequence and the switching time in switch periods are adjusted with the method that equipollent vectors are replaced.
A kind of fault-tolerant control system of T-type three-level inverter open-circuit fault, it is characterised in that: for realizing in any one
A kind of fault tolerant control method for the T-type three-level inverter open-circuit fault stated, including it is DC source, T-type three-level inverter, negative
Load, controller and fault signature extraction module；The DC source is connected to power with T-type three-level inverter, load and three electricity of T-type
Flat inverter is connected；The fault signature extraction module is connected with the reading for realizing fault-signal with T-type three-level inverter；The control
Device processed is connected to realize fault diagnosis and according to fault type to T-type with fault signature extraction module and T-type three-level inverter
The carry out faults-tolerant control of three-level inverter.
By the above-mentioned description of this invention it is found that compared with prior art, the invention has the following beneficial effects:
Method of the invention can adapt to using the open-circuit fault Diagnostic Strategy predicted based on equivalent voltage vector locus
The variation of payload size, power factor and degree of unbalancedness.System of the invention adjusts threshold value according to modulation degree size dynamic, compared with
The precise positioning of T-type three-level inverter open circuit point is realized well, and the fault-tolerant fortune of system is realized by vector equivalence replacement
Row.
Detailed description of the invention
Fig. 1 be the present invention in based on equivalent voltage vector characteristic T-type three-level inverter open-circuit fault diagnosis with it is fault-tolerant
Control system schematic diagram；
Fig. 2 is T-type three-level inverter output voltage vector distribution map in the present invention；
Fig. 3 is that the big sector in the present invention in SVPWM modulated process judges schematic diagram；
Fig. 4 is that the small sector in the present invention in SVPWM modulated process judges schematic diagram；
Fig. 5 is inverter in the present invention in the threephase switch state change map in a switch periods；
Fig. 6 is T-type three-level inverter of the present invention and fault signature extraction module connection schematic diagram；
Fig. 7 is fault signature extraction module circuit diagram of the present invention；
Fig. 8 is the current path situation of inverter under normal operating condition in the present invention；
Fig. 9 is the current path situation of inverter under open fault condition in the present invention；
Figure 10 is output voltage vector distortion figure under open fault condition in the present invention；
Figure 11 is equivalent output voltage vector trajectory diagram under open fault condition in the present invention；
Figure 12 is that inverter needs to carry out the effective voltage vector distribution of drop volume fault-tolerant operation under open-circuit fault in the present invention
Figure；
Figure 13 is that inverter is able to carry out the effective voltage vector distribution of fault-tolerant operation in full under open-circuit fault in the present invention
Figure；
Figure 14 is for faults-tolerant control in the present invention to the adjustment procedure chart of switch state in a switch periods；
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Specific embodiment
Below by way of specific embodiment, the invention will be further described.
Referring to Fig. 1, the present invention provides a kind of diagnosis of T-type three-level inverter open-circuit fault and fault-tolerant control system,
Including DC source, T-type three-level inverter circuit, load, controller and fault signature extraction module, DC source, three level of T-type
Inverter circuit loads the main working parts for system.Controller is connected with T-type three-level inverter circuit realizes control,
Fault signature extraction module is connected with T-type three-level inverter circuit realizes the reading of fault-signal.Controller and fault signature
Extraction module, which is connected, realizes the processing of fault-signal, i.e. realization fault diagnosis, finally realizes controller to T-type three-level inverter
The faults-tolerant control of circuit.
Present system uses a kind of fault tolerant control method of T-type three-level inverter open-circuit fault, comprising the following steps:
Step 1: system is specifically included following using the control T-type three-level inverter operation of 7 segmentation SVPWM modulation systems
Step:
Step 1.1: its phase voltage output equation is obtained according to three-phase T-type three-level inverter topology circuit:
X ∈ { A, B, C }, S in formulaA1=1 indicates No. 1 pipe conducting of A phase, SA1=0 indicates No. 1 pipe shutdown of A phase, udcRepresent T-type
Three-level inverter DC side busbar voltage.
Step 1.2: calculate the three-phase voltage vector space distribution equation of T-type three-level inverter output:
In formula, SA,SB,SC∈ { 1,0, -1 }, SAIt takes 1 to represent A phase and exports high level udc/ 2,0 represents output intermediate level ,-
1 represents output low level-udc/2。
Step 1.3: the output voltage vector point of three-level inverter is drawn according to three-phase voltage vector space distribution equation
Butut.
As shown in Fig. 2, voltage vector distribution is a regular hexagon, and including six short vectors, 2 kinds of each correspondence
Switch state, six middle vectors, a kind of switch state of each correspondence, six long vectors, a kind of switch state of each correspondence, a null vector
Amount, corresponding 3 kinds of switch states.
P in Fig. 2, O, N respectively represent bridge arm output high level udc/ 2, zero point flat 0, low level-udc/ 2,
Short vector is divided into the short short vector of vector sum negative polarity of positive polarity, under the action of the former, on DC side midpoint potential
It rises, under the action of the latter, the decline of DC side midpoint potential.
Step 1.4: calculating current reference voltage vector VrefSection in voltage vector distribution map.
As shown in figure 3, being divided into a big sector every 60 ° according to counter clockwise direction, successively it is set to I sector to Section VI
Sector；As shown in figure 4, sector I is divided into 1 to 6, totally six small sectors, other sectors are similarly divided；Calculate reference voltage arrow
Measure VrefPhase angle and judge its big sector and small sector.
Step 1.5: SVPWM modulation is carried out, according to VrefLocating sector calculates vector sequence and effect in switch periods
Time.
In step 1.5, according to VrefLocating sector calculates the vector in switch periods sequentially and action time includes: out
Guarantee that only a phase bridge arm carries out state switching when closing each vectors switching in the period, and every phase only switches two in one cycle
It is secondary；First vector sum the last one vector in using the short vector of negative polarity as a switch periods, guarantees small sector switch
When at most there is a bridge arm to need switching state；Positive and negative short vector in each big sector makees the offset of midpoint potential
With cancelling out each other.
According to the vector state of each sector of vector arrangement regulation arrangement sequence such as table:
As shown in figure 5, obtaining waveform of the threephase switch state in wherein a cycle according to the vector calculation method
Figure.
Step 2: bridge arm output and the DC side mid-point voltage of sampling T-type three-level inverter obtain its low-frequency voltage letter
Number.As shown in fig. 6, being the connection figure of fault signature extraction module and T-type Three-Level Inverter System, wherein three level of T-type is inverse
Become device to be made of 12 IGBT, two DC bus capacitors C1, C2, fault signature extraction module includes sample circuit and conditioning electricity
Road samples and handles the voltage u between T-type three-level inverter three-phase bridge arm output terminals A, B, C and DC side midpoint O at 3 pointsAO、
uBO、uCO.The circuit of three-phase is completely the same, is illustrated by taking A circuitry phase as an example, fault signature extraction module electricity as shown in Figure 7
Discrete voltage signal between 3 points of A, B, C and DC side midpoint O can be sampled, therefrom be extracted available by Lu Tu
In the useful signal of fault diagnosis.The voltage signal u sampled by sample circuitAO、uBO、uCOIt is handled by conditioning circuit
To low-frequency voltage signal uAO1、uBO1、uCO1。
Specifically, in Fig. 7Sample circuitUsing voltage sensor LV25-P as core, for acquiring T-type tri-level inversion
Device voltage signal uAOAnd by its scaled down to -3V to 3V.Wherein, R11 and R21 is current-limiting resistance one end and voltage sensor
One input terminal of device is connected, other end connecting T-shaped three-level inverter.Voltage sensor LV25-P, sampling resistor R31, filtered electrical
Hold C11, resistance R11 and resistance R21 and forms sample circuit.
Conditioning circuitUsing operational amplifier TL082 as core, the signal for obtaining to sample circuit is further located
Reason is to obtain the voltage signal that controller can be allowed to be read out.Circuit specifically includes two parts, resistance R41, R51, R61,
The circuit of capacitor C21, operational amplifier U11A composition realizes the biasing of signal, i.e., by the prime signal processing of -3V to 3V at 0
To the signal of 3V；The circuit that resistance R71, capacitor C31, diode D11, D21, operational amplifier U11B are formed realizes signal
Low-pass filtering eliminates the higher component of signal intermediate frequency rate, finally obtains low frequency signal uAO1。
Step 3: low-frequency voltage signal being coordinately transformed to obtain the equivalent output voltage vector track of inverter.It i.e. will be low
Frequency voltage signal uAO1、uBO1、uCO1Clark is carried out to convert to obtain voltage vector uinv, and corresponding electricity is obtained in alpha-beta coordinate system
Press vector locus, Clark coordinate transform formula are as follows:
The amplitudes such as correspondence of coefficient 2/3 change coordinate transform, u in formulaα、uβRespectively uinvIn point of α axis direction and β axis direction
Amount.
Step 4: calculating the voltage vector track under different faults situation and operating status, establish fault eigenvalue true value
Table.Specifically comprise the following steps:
Step 4.1: calculating the current path under various open fault conditions, analyze the variation of phase voltage under each open-circuit fault
Rule.Fig. 8 show the current path under a wherein phase bridge arm normal operating conditions, and Fig. 9, which is shown, calculates various open-circuit faults
In the case of current path, analyze the changing rule of phase voltage under each failure.
Step 4.2: inverter output voltage vector distribution map being modified according to the variation of phase voltage, is as shown in Figure 10 SA1It opens
Voltage vector distortion situation under the fault condition of road, wherein the switch state with box label is distortion switch state.
Step 4.3: the sequence acted on according to vector in each small sector and time calculate and each open under current failure type
The equivalent voltage vector in the period is closed, corresponding distortion track is drawn out,
Equipollent vectors accounting equation under fault condition are as follows:
V in formulacalFor distorted voltage vector, VrefFor reference voltage vector, VkFor k-th breakdown switch state in the period
Offset vector, ηkFor the action time accounting of k-th of breakdown switch state in the period.T-type three-level inverter uses seven segmentations
SVPWM modulation, k value 1 to 7.
Step 4.4: being plotted in the case of each modulation degree m, the corresponding distortion track of various fault conditions extracts each track
Characteristic value, the direction of degree and distortion including distortion obtains fault eigenvalue truth table.Modulation degree m is three level of T-type
The amount of output voltage size is determined during inverter output.
It as shown in figure 11, is m=0.8, SA1Equivalent voltage equipollent vectors track when open-circuit fault, distort equation of locus
It is as follows:
Step 5: according to the characteristic value of current system and fault eigenvalue truth table, judging the current failure classes of system
Type.Calculate n sampled value u in each power frequency periodα、uβAverage value Σ uα/n、Σuβ/ n calculates the mould A of average voltage vector
And phase angle theta, A and two characteristic values of the θ as fault diagnosis.
The calculation formula of characteristic value A are as follows:
The calculation formula of characteristic value θ are as follows:
Step 6: according to fault type, switching corresponding control program, realize T-type three-level inverter fault-tolerant operation.Including
Following steps:
Step 6.1: the remaining effective voltage of T-type three-level inverter under current failure being calculated according to fault diagnosis result and is sweared
Amount.
When open-circuit fault occurs, partial switch state failure, wherein short vector sum zero vector respectively corresponds two kinds and three kinds
Switch state, middle vector sum long vector only corresponds to a kind of switch state, if each vector is without effective switch state, vector failure.
Step 6.2: according to effective voltage vector remaining under gained failure, judging whether T-type three-level inverter has appearance
The ability of Wrong Shipment row.
The primary condition that system possesses fault-tolerant operation ability has following two:
1, remaining effective voltage vector area includes zero vector, and zero vector is located inside effective coverage；
2, remaining effectively short vector can be realized the balance to DC side midpoint potential.
Step 6.3: calculating the failure conditions of switch state in switch periods, draw the effective output voltage arrow of current inverter
Measure areal map.
As shown in figure 12, if effectively output voltage vector range reduces, and modulation degree m > 0.5 then adjusts m pressure to having
It imitates within the scope of output voltage vector, carries out drop volume fault-tolerant operation.
As shown in figure 13, if effectively output voltage vector range is constant, it is able to carry out fault-tolerant operation in full.
Step 6.4: as shown in figure 14, with the vector sequence in the method adjustment switch periods that equipollent vectors are replaced and cutting
Change the time.
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this
Design makes a non-material change to the present invention, and should all belong to behavior that violates the scope of protection of the present invention.
Claims (9)
1. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault, which comprises the following steps:
Step 1: system is using the control T-type three-level inverter operation of 7 segmentation SVPWM modulation systems；
Step 2: bridge arm output and the DC side mid-point voltage of sampling T-type three-level inverter obtain its low-frequency voltage signal；
Step 3: low-frequency voltage signal being coordinately transformed to obtain the equivalent output voltage vector track of inverter；
Step 4: calculating the voltage vector track under different faults situation and operating status, establish fault eigenvalue truth table；
Step 5: according to the characteristic value of current system and fault eigenvalue truth table, judging the current fault type of system；
Step 6: according to fault type, switching corresponding control program, realize T-type three-level inverter fault-tolerant operation.
2. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
The step 1 specifically includes the following steps:
Step 1.1: its phase voltage output equation is obtained according to three-phase T-type three-level inverter topology circuit:
X ∈ { A, B, C }, S in formulaA1=1 indicates No. 1 pipe conducting of A phase, SA1=0 indicates No. 1 pipe shutdown of A phase, udcRepresent three electricity of T-type
Flat inverter direct-flow side busbar voltage；
Step 1.2: calculate the three-phase voltage vector space distribution equation of T-type three-level inverter output:
In formula, SA,SB,SC∈ { 1,0, -1 }, SAIt takes 1 to represent A phase and exports high level udc/ 2,0 represents output intermediate level, -1 generation
Table exports low level-udc/2；
Step 1.3: the output voltage vector distribution map of three-level inverter is drawn according to three-phase voltage vector space distribution equation；
Step 1.4: calculating current reference voltage vector VrefSection in voltage vector distribution map；
Step 1.5: SVPWM modulation is carried out, according to VrefWhen locating sector calculates vector sequence and effect in switch periods
Between.
3. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
In the step 1.5, according to VrefLocating sector calculates the vector in switch periods sequentially and action time includes: switch week
Guarantee that only a phase bridge arm carries out state switching in phase when each vectors switching, and every phase only switches twice in one cycle；With
The short vector of negative polarity is as first vector sum the last one vector in a switch periods, when guaranteeing small sector switch
At most there is a bridge arm to need switching state；Positive and negative short vector in each big sector wants phase for the offset effect of midpoint potential
Mutually offset.
4. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
In the step 2, the bridge arm output of the T-type three-level inverter obtains institute by low-pass filter with DC side mid-point voltage
State low-frequency voltage signal.
5. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
In the step 3, the coordinate is transformed to Clark transformation, formula are as follows:
uα、uβRespectively component of the voltage vector in α axis direction and β axis direction, uAO、uBO、uCOFor T-type three-level inverter three-phase
Voltage between bridge arm output terminals A, 3 points of B, C and DC side midpoint O.
6. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
The step 4, specifically includes:
Step 4.1: calculating the current path under various open fault conditions, analyze the variation rule of phase voltage under each open-circuit fault
Rule；
Step 4.2: inverter output voltage vector distribution map is modified according to the changing rule of phase voltage；
Step 4.3: the sequence acted on according to vector in each small sector and time calculate each switch week under current failure type
Equivalent voltage vector in phase draws out corresponding distortion track；
Equipollent vectors accounting equation under fault condition are as follows:
V in formulacalFor distorted voltage vector, VrefFor reference voltage vector, VkFor the offset of k-th of breakdown switch state in the period
Vector, ηk
For the action time accounting of k-th of breakdown switch state in the period, k value 1 to 7；
S44: being plotted in the case of each modulation degree, and the corresponding distortion track of various fault conditions extracts the characteristic value of each track,
The direction of degree and distortion including distortion, obtains fault eigenvalue truth table.
7. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as claimed in claim 5, which is characterized in that
The step 5 specifically includes: computing system current characteristic value A and θ, A and θ are respectively the mould and phase angle of average voltage vector；
The calculation formula of A are as follows:
The calculation formula of θ are as follows:
N is T-type Three-Level Inverter System in the sampling number in a power frequency period.
8. a kind of fault tolerant control method of T-type three-level inverter open-circuit fault as described in claim 1, which is characterized in that
The step 6 specifically includes:
Step 6.1: the remaining effective voltage vector of T-type three-level inverter under current failure is calculated according to fault type；
Step 6.2: according to the remaining effective voltage vector of gained, judging whether T-type three-level inverter has fault-tolerant operation
Ability；
Step 6.3: calculating the failure conditions of switch state in switch periods, draw the effective output voltage vector model of current inverter
Enclose figure；If effective output voltage vector range reduces, and modulation degree > 0.5, then modulation degree pressure is adjusted to effective output voltage
In vector scope, drop volume fault-tolerant operation is carried out；If effective output voltage vector range is constant, it is able to carry out fault-tolerant fortune in full
Row；
Step 6.4: vector sequence and the switching time in switch periods are adjusted with the method that equipollent vectors are replaced.
9. a kind of fault-tolerant control system of T-type three-level inverter open-circuit fault, it is characterised in that: for realizing any one right
It is required that a kind of fault tolerant control method of T-type three-level inverter open-circuit fault described in 1 to 8, including DC source, three level of T-type
Inverter, load, controller and fault signature extraction module；The DC source is connected to power with T-type three-level inverter, load
It is connected with T-type three-level inverter；The fault signature extraction module is connected with T-type three-level inverter to realize fault-signal
It reads；The controller is connected to realize fault diagnosis and according to failure with fault signature extraction module and T-type three-level inverter
Carry out faults-tolerant control of the type to T-type three-level inverter.
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