CN110426664A - A kind of the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method of two current sensors of band - Google Patents
A kind of the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method of two current sensors of band Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method of a kind of two current sensors of band, this method uses output line voltage deviation and output phase voltage deviation as diagnostic variable simultaneously, is detected by two kinds of diagnostic variable features combinations and positioning failure.The present invention realizes the three-phase three-wire system open-circuit fault of power tubes of inverter of two current sensors of band and the comprehensive diagnos of current sensor faults for the first time, only need existing information in control system, and calculation amount is small, it can be when not increasing extra samples and hardware circuit, it realizes that two kinds of failures fast and accurately diagnose, has the advantages that practical.
Description
Technical field
The invention belongs to power electronic equipment fault diagnosis technology fields, and in particular to a kind of two current sensors of band
Three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults error comprehensive diagnosis method.
Background technique
Inverter is widely studied and applies in fields such as new-energy grid-connected, uninterruptible power supplies, and inverter plays control
With the key effect of transmission electric energy, but inverter is also the highest equipment of failure rate.The unexpected of fault of converter occurs to lead
Cause huge loss.And fast and accurately fault diagnosis is carried out to inverter and helps to improve inverter availability, in time protection
System and reduction maintenance time, therefore have great importance.In inverter, open-circuit fault of power tubes and current sensor event
Barrier is most common failure.
Currently, relatively more for the public technology of open-circuit fault of power tubes of inverter diagnosis, they can substantially be divided into four
Class: method (such as number of patent application 201610438466.9, number of patent application 201510769410.7 based on artificial intelligence
Deng), the method (such as number of patent application 201611111173.6,201611106907.1) based on electric current, the side based on voltage
Method (such as number of patent application 201610412312.2, number of patent application 201610286526.X) and method based on model are (such as
Number of patent application 201310148901.0, number of patent application 201310743597.4 etc.), but above in relation to open-circuit fault of power tubes
Method can not diagnose current sensor faults simultaneously, have limitation.
It is fewer for the public technology of inverter current sensor fault diagnosis, wherein patent application (such as patent application
Numbers 201710717539.2, number of patent application 201710717183.2 etc.) there is open inverter current sensor fault diagnosis
Method, but these can not diagnose open-circuit fault of power tubes for the method for current sensor faults diagnosis simultaneously, have limitation.
Patent application (such as number of patent application 201810930465.5) discloses one kind and takes into account the event of inverter power tube open circuit
The diagnostic method of barrier and current sensor faults, including diagnostic signal is obtained from inverter；Line voltage between calculating bridge arm
Line voltage actual value between desired value and bridge arm；Line voltage deviation is as the first diagnostic variable between calculating bridge arm；Calculate inductance electricity
The deviation of the sum of stream is as second opinion variable；Set the threshold value of the first diagnostic variable；Set the threshold value of second opinion variable；
The polarity for calculating the first diagnostic variable and second opinion variable carrys out comprehensive diagnos inverter current sensing further according to fault diagnosis table
Device failure and open-circuit fault of power tubes；If failure has occurred in the current sensor for being diagnosed to be a certain phase, current sensor event is carried out
Hinder fault-tolerant.But this method is only adapted to band there are three the three-phase three-wire system inverter of current sensor, is not suitable for two
The three-phase three-wire system inverter of a current sensor.
As it can be seen that there is presently no methods can be simultaneously in three-phase three-wire system inverter of the band there are two current sensor
Realize the comprehensive diagnos of open-circuit fault of power tubes and current sensor faults.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of three-phase three-wire system inverter power pipes for two current sensors of band
The error comprehensive diagnosis method of open-circuit fault and current sensor faults, can when not increasing extra samples and hardware circuit,
Realize quick, the Accurate Diagnosis of both failures.
A kind of the three-phase three-wire system open-circuit fault of power tubes of inverter and current sensor faults of two current sensors of band
Error comprehensive diagnosis method includes the following steps:
(1) diagnostic electric information is obtained from the three-phase three-wire system inverter system of two current sensors of band,
Measured value v including DC bus-bar voltagedc ^, every phase power tube pulse drive signal sX, duty ratio dX, biphase current measurement
Value iX ^, every phase phase voltage measured value vXO ^, every phase filter inductance LXOften be connected in series equivalent resistance RX；Wherein, X is A phase, B phase
Or C phase；
(2) according to above-mentioned electric information, the measured value v of current time k output line voltage is calculatedXY ^[k] and output line voltage
Estimated value vXY *Deviation delta v between [k]XY[k]=vXY ^[k]-vXY *[k]；
Calculate the measured value v of current time output phase voltageXO ^[k] and output phase voltage estimated value vXO *It is inclined between [k]
Poor Δ vXO[k]=vXO ^[k]-vXO *[k]；
And by Δ vXY[k] and Δ vXO[k] is used as diagnostic variable；Wherein X, Y are respectively A phase, B phase or C phase, and X ≠ Y；
(3) it is combined according to described two diagnostic variable features to detect power tube and current sensor with positioning failure.
In the step (2), current time k output line voltage estimated value vXY *The calculating formula of [k] by following formula into
Row discretization and obtain:
Wherein: VXY *=(sX-sY)·vdc ^,
WithIt is X phase and Y current phasor measurement value respectively,
vXY *It is the voltage estimated value between the phase bridge arm midpoint X and Y phase bridge arm midpoint,
LXAnd LYThe respectively filter inductance of X phase and Y phase,
RXAnd RYThe respectively series equivalent resistance of X phase and Y phase,
vdc ^It is DC bus-bar voltage measured value,
sXAnd sYIt is the driving signal of X phase and Y phase bridge arm switching tube respectively,
Driving signal sXDefinition be
Export phase voltage estimated value vXO *The calculating formula of [k] is obtained and carrying out discretization to following formula:
Wherein: VXL *=sX·vdc ^,
Diagnostic variable is characterized in diagnostic variable polarity in the step (3), is determined by following formula:
Wherein: Δ vsub[k] represents the diagnostic variable at current time,
Δvth,sub[k] represents current time and diagnostic variable Δ vsub[k] corresponding diagnostic threshold,
Δsub[k] represents diagnostic variable Δ vth,subThe polarity of [k],
P, Z, N respectively correspond three kinds of different polarity.
Preferably, the diagnostic threshold is determined using error adaptive threshold method.
It is as follows with the combination of two kinds of diagnostic variable features of positioning failure for detecting:
Wherein: symbol "/" indicates "or"；(CSA×,CSB) indicate to have A phase and B phase current sensor in inverter, and A
Phase current sensor fault.
Based on the above-mentioned technical proposal, the present invention has following advantageous effects:
(1) the method for the present invention realizes the three-phase three-wire system inverter power tube open circuit event of two current sensors of band for the first time
The comprehensive diagnos of barrier and current sensor faults.
(2) the method for the present invention only needs existing information in control system, and calculation amount is small, to avoid increasing additionally
Hardware circuit and software burden.
(3) the method for the present invention uses voltage deviation as diagnostic variable, and quick diagnosis may be implemented, if Diagnostic Time is as short as
The dry sampling period.
Detailed description of the invention
Fig. 1 is the three-phase three-wire system inverter topology and its event of power tube open circuit of two current sensors of band of the present invention
The flow diagram of barrier and current sensor faults error comprehensive diagnosis method.
Fig. 2 is the experimental result schematic diagram of open-circuit fault of power tubes of inverter of the present invention diagnosis.
Fig. 3 is the experimental result schematic diagram of inverter current sensor fault diagnosis of the present invention.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
As shown in Figure 1, the three-phase three-wire system inverter topology and power tube of two current sensors of band of the present invention are opened
Road failure and current sensor faults error comprehensive diagnosis method the following steps are included:
S1. diagnostic electric information is obtained from the three-phase three-wire system inverter system of two current sensors of band
In three-phase three-wire system inverter with two current sensors, output current phase (iA、iB), output phase voltage (vAO、
vBO、vCO), DC bus-bar voltage (vdc) be collected and be sent into control system, to realize the functions such as operation with closed ring and protection；Control
Device operation obtains the pulse drive signal (s of each phase bridge armA、sB、sC) or duty ratio (dA、dB、dC), to control inverter
Operation；In controller, also storage inductance (LA、LB、LC) and series equivalent resistance (RA、RB、RC) etc. information.
In the present embodiment, A phase and B phase current sensor are had, so C phase current is iC=-iA-iB.And line voltage vXY
(X, Y=A, B or C, and X ≠ Y) can be obtained, v by phase voltage calculationXY=vXO-vYO。
Above-mentioned existing every terms of information is obtained from controller to realize that the open-circuit fault of power tubes of inverter and electric current pass
The diagnosis of sensor failure.
S2. two kinds of diagnostic variables: output line voltage deviation and output phase voltage deviation are calculated
According to above-mentioned electric information, current time k output line voltage v is calculatedXYMeasured valueWith output line voltage
Estimated value vXY *Deviation between [k]
It calculates current time k and exports phase voltage vXOMeasured value vXO ^[k] and output phase voltage estimated value vXO *Between [k]
Deviation delta vXO[k]=vXO ^[k]-vXO *[k], and by Δ vXY[k] and Δ vXO[k] is used as diagnostic variable；
In the present embodiment, each switch periods sampling of inverter is primary, so using switch periods averaging method to formulaDeng progress discretization, available vXY *The calculating of [k]
Formula is as follows:
Wherein:
WithIt is previous moment X phase and Y current phasor measurement value respectively,
WithIt is current time X phase and Y current phasor measurement value respectively,
VXY *[k] be current time X phase bridge arm midpoint and Y phase bridge arm midpoint between voltage estimated value,
LXAnd LYThe respectively filter inductance of inverter X phase and Y phase,
RXAnd RYThe respectively series equivalent resistance of inverter X phase and Y phase,
vdc ^[k-1] and vdc ^[k] is previous moment and current time DC bus-bar voltage measured value respectively,
dX[k-1] and dY[k-1] is that previous moment X phase and Y phase bridge arm power tube drive duty ratio respectively,
TsFor sampling interval duration.
It is right using switch periods averaging methodDeng carry out from
Dispersion, available vXO *[k] is as follows:
Wherein:
Then output line voltage deviation is obtained are as follows:
ΔvXY[k]=vXY ^[k]-vXY *[k]
Output phase voltage deviation are as follows:
ΔvXO[k]=vXO ^[k]-vXO *[k]
S3. it is detected according to the combination of two kinds of diagnostic variable features and positioning failure
Diagnostic variable described in S2 step, i.e. output line voltage deviation and output phase voltage deviation are obtained, diagnostic variable is special
Sign is that diagnostic variable polarity is determined by following formula:
Wherein: Δ vsub[k] represents the diagnostic variable at current time, Δ vth,sub[k] represents current time and diagnostic variable
Δvsub[k] corresponding diagnostic threshold, Δsub[k] represents diagnostic variable Δ vth,subThe polarity of [k], P, Z, N respectively correspond three
The different polarity of kind.
For example, when Δ v has been calculatedAB[k]≥Δvth,AB[k], then have ΔAB[k]=P；When-Δ has been calculated
vth,AB[k] < Δ vAB[k] < Δ vth,AB[k], then have ΔAB[k]=Z；When Δ v has been calculatedAB[k]≤-Δvth,AB[k],
Then there is ΔAB[k]=N.In practical programs are write, P, Z, N can be used to 1,0, -1 reference respectively.In the present embodiment, it diagnoses
Threshold value is determined using error adaptive threshold method.
After obtaining diagnostic variable feature, judged according to the combination of two kinds of diagnostic variable features shown in table 1 and positioning failure.
Table 1
Wherein: symbol "/" indicates "or"；(CSA×,CSB) indicate to have A phase and B phase current sensor in inverter, and A
Phase current sensor fault.
In order to clearly describe the embodiment, Fig. 2 and Fig. 3 give the experimental result under the embodiment.The experiment
The parameter used is as shown in table 2.
Fig. 2 is power tube T1The diagnostic result of tube open circuit failure.In t0Time trigger T1Open-circuit fault.T1It occurs for failure
Preceding all diagnostic variables are all in threshold value.And after failure occurs, part diagnostic variable deviates threshold range quickly, presents specific
Deviation polarity.When detecting deviation polarity (ΔAB,ΔBC,ΔCA,ΔAO,ΔBO, ΔCO) when becoming (N, Z, P, N, P, P), T1
Failure is diagnosed, and Diagnostic Time is 0.2ms (2 switch periods, 1% primitive period).
Fig. 3 is CSAThe diagnostic result of failure.In t0Time trigger CSAFailure.CSABefore failure occurs, all diagnosis
Variable is all in threshold value.And t0After moment failure occurs, part diagnostic variable deviates zero quickly, and specific deviation polarity group is presented
It closes.In t1Moment, when detecting that deviation polarity becomes (N, N, P, N, Z, P), CSAFailure is diagnosed, Diagnostic Time 0.2ms
(2 switch periods, 1% primitive period).
Above results proved that the accuracy and rapidity of the method for the present invention.
Table 2
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (6)
1. open-circuit fault of power tubes and current sensor faults in a kind of three-phase three-wire system inverter of two current sensors of band
Error comprehensive diagnosis method includes the following steps:
(1) diagnostic electric information is obtained from the three-phase three-wire system inverter system of two current sensors of band, including
The measured value v of DC bus-bar voltagedc^, every phase power tube pulse drive signal sX, duty ratio dX, biphase current measured value iX^、
The measured value v of every phase output phase voltageXO^, every phase filter inductance LXOften be connected in series equivalent resistance RX, wherein X is A phase, B phase
Or C phase；
(2) according to above-mentioned electric information, the measured value v of current time k output line voltage is calculatedXY^ [k] estimates with output line voltage
Evaluation vXY *Deviation delta v between [k]XY[k]=vXY^[k]-vXY *[k]；
Calculate the measured value v of current time output phase voltageXO^ [k] and output phase voltage estimated value vXO *Deviation delta between [k]
vXO[k]=vXO^[k]-vXO *[k]；
And by Δ vXY[k] and Δ vXO[k] is used as diagnostic variable, and wherein X, Y are respectively A phase, B phase or C phase, and X ≠ Y；
(3) it is combined according to described two diagnostic variable features to detect power tube and current sensor with positioning failure.
2. open-circuit fault of power tubes and current sensor faults are comprehensive in three-phase three-wire system inverter according to claim 1
Diagnostic method, it is characterised in that: in the step (2), current time k output line voltage estimated value vXY *The calculating formula of [k] passes through
Discretization is carried out to following formula and is obtained:
Wherein: VXY *=(sX-sY)·vdc^, iX^ and iY^ is X phase and Y current phasor measurement value respectively,
VXY *It is the voltage estimated value between the phase bridge arm midpoint X and Y phase bridge arm midpoint,
LXAnd LYThe respectively filter inductance of X phase and Y phase,
RXAnd RYThe respectively series equivalent resistance of X phase and Y phase,
vdc^ is DC bus-bar voltage measured value,
sXAnd sYIt is the pulse drive signal of X phase and Y phase bridge arm power tube respectively,
sXDefinition be
3. open-circuit fault of power tubes and current sensor faults are comprehensive in three-phase three-wire system inverter according to claim 1
Diagnostic method, it is characterised in that: in the step (2), phase voltage estimated value vXO *The calculating formula of [k] by following formula into
Row discretization and obtain:
Wherein: VXL *=sX·vdc^,
VXL *It is the voltage estimated value between the phase bridge arm midpoint X and DC side low-voltage end,
VOL *It is the voltage estimated value exchanged between side output midpoint and DC side low-voltage end.
4. open-circuit fault of power tubes and current sensor faults diagnosis in three-phase three-wire system inverter according to claim 1
Method, it is characterised in that: in the step (3), diagnostic variable is characterized in diagnostic variable polarity, is determined by following formula:
Wherein: Δ vsub[k] represents the diagnostic variable at current time,
Δvth,sub[k] represents current time and diagnostic variable Δ vsub[k] corresponding diagnostic threshold,
Δsub[k] represents diagnostic variable Δ vth,subThe polarity of [k],
P, Z, N respectively correspond three kinds of different polarity.
5. open-circuit fault of power tubes and current sensor faults diagnosis in three-phase three-wire system inverter according to claim 4
Method, it is characterised in that: the diagnostic threshold is determined using error adaptive threshold method.
6. open-circuit fault of power tubes and current sensor faults diagnosis in three-phase three-wire system inverter according to claim 4
Method, it is characterised in that: as follows with the combination of two kinds of diagnostic variable features of positioning failure for detecting in the step (3):
Wherein: symbol "/" indicates "or"；(CSA×,CSB) indicate to have A phase and B phase current sensor in inverter, and A phase electricity
Flow sensor failure.
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| CN111190066A (en) * | 2020-01-14 | 2020-05-22 | 中南大学 | Fault diagnosis method for matrix converter motor driving system |
| CN111381188A (en) * | 2020-03-18 | 2020-07-07 | 华中科技大学 | Bridge arm open-circuit fault diagnosis method for two-level three-phase voltage source inverter |
| CN111413647A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Real-time detection method and system for open-circuit fault of C LLL C resonant converter |
| CN111983508A (en) * | 2020-07-09 | 2020-11-24 | 华中科技大学 | T-type three-phase four-wire rectifier fault real-time detection and positioning method and system |
| CN112444759A (en) * | 2020-11-10 | 2021-03-05 | 武汉大学 | Open-circuit fault diagnosis method and system for power switch device of three-phase three-level rectifier |
| CN112526397A (en) * | 2020-11-23 | 2021-03-19 | 中国矿业大学 | Open-circuit fault diagnosis method for neutral point clamped single-phase three-level inverter |
| CN114355148A (en) * | 2022-03-10 | 2022-04-15 | 中南大学 | Inverter power tube open-circuit fault diagnosis method and device and electronic equipment |
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| CN111190066A (en) * | 2020-01-14 | 2020-05-22 | 中南大学 | Fault diagnosis method for matrix converter motor driving system |
| CN111190066B (en) * | 2020-01-14 | 2021-01-05 | 中南大学 | Fault diagnosis method for matrix converter motor driving system |
| CN111381188A (en) * | 2020-03-18 | 2020-07-07 | 华中科技大学 | Bridge arm open-circuit fault diagnosis method for two-level three-phase voltage source inverter |
| CN111413647A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Real-time detection method and system for open-circuit fault of C LLL C resonant converter |
| CN111413647B (en) * | 2020-04-29 | 2021-05-18 | 华中科技大学 | CLLLC resonant converter open-circuit fault real-time detection method and system |
| CN111983508A (en) * | 2020-07-09 | 2020-11-24 | 华中科技大学 | T-type three-phase four-wire rectifier fault real-time detection and positioning method and system |
| CN111983508B (en) * | 2020-07-09 | 2021-10-08 | 华中科技大学 | T-type three-phase four-wire rectifier fault real-time detection and positioning method and system |
| CN112444759A (en) * | 2020-11-10 | 2021-03-05 | 武汉大学 | Open-circuit fault diagnosis method and system for power switch device of three-phase three-level rectifier |
| CN112526397A (en) * | 2020-11-23 | 2021-03-19 | 中国矿业大学 | Open-circuit fault diagnosis method for neutral point clamped single-phase three-level inverter |
| CN114355148A (en) * | 2022-03-10 | 2022-04-15 | 中南大学 | Inverter power tube open-circuit fault diagnosis method and device and electronic equipment |
| CN114355148B (en) * | 2022-03-10 | 2022-06-17 | 中南大学 | Inverter power tube open-circuit fault diagnosis method and device and electronic equipment |
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