CN108037403A - The inverter open fault diagnostic method and device of a kind of current hysteresis-band control - Google Patents
The inverter open fault diagnostic method and device of a kind of current hysteresis-band control Download PDFInfo
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- CN108037403A CN108037403A CN201711271065.XA CN201711271065A CN108037403A CN 108037403 A CN108037403 A CN 108037403A CN 201711271065 A CN201711271065 A CN 201711271065A CN 108037403 A CN108037403 A CN 108037403A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of inverter open fault diagnostic method of current hysteresis-band control, including：Build fault model of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs；Fault signature when open fault occurs is obtained according to the Analysis of Failure Model；The fault-signal when inverter circuit of the current hysteresis-band control breaks down is obtained, the fault-signal and non-faulting signal are contrasted, obtain comparing result；The comparing result is matched with the fault signature, judges the trouble point that the inverter circuit of current hysteresis-band control described in the phase breaks down.This method can be in fast positioning trouble point in a cycle after failure occurs, and changes adaptable, to change from load influence for ring width.
Description
Technical field
The present invention relates to power electronic devices fault diagnosis technology field, particularly relates to a kind of inversion of current hysteresis-band control
Device open fault diagnostic method and device.
Background technology
Inverter is the important component in industrial production, with reference to the inverter after Hysteresis control because its realization is simple, electric current
Response quickly, is widely used the features such as without load parameter and in the industry.Research shows, in motor variable-frequency speed-regulating
In system, the failure of inverter occupies main component in institute is faulty, and fault of converter is often as power tube
Caused by failure.Power tube short trouble can be converted into open fault by fastp-acting fuse of connecting in bridge arm.So greatly
Most power tube failures occur usually in the form of open fault.If some power tube breaks down, other power tubes also can
It is affected in succession, it is possible to causing whole converter system to be paralysed, personal safety belt can be given in some cases or even also
To threaten.Therefore, it is necessary to study a kind of open fault diagnostic method efficient real-time.
Due to output voltage in current hysteresis-band control and have not regulation, it is difficult to observe and record, it is traditional based on voltage
Fault diagnosis model in this case and do not have an applicability, and substantial amounts of calculate and complicated diagnosis process is to the number of equipment
The requirement of higher is it is also proposed according to the performance of memory space and processor, simultaneously because link is excessively in the process for calculating and handling
The probability of middle error also can relative increase, this is that people are not intended to see.In addition, special running environment or can not change
System structure also limit the installations of additional sensors.
The content of the invention
In view of this, it is an object of the invention to propose a kind of inverter open fault diagnostic method of current hysteresis-band control
And device, it can realize the diagnosis rapidly and efficiently to the inverter circuit open fault of current hysteresis-band control.
Based on a kind of inverter open fault diagnostic method of above-mentioned purpose current hysteresis-band control provided by the invention, bag
Include：
Build fault model of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs；
Fault signature when open fault occurs is obtained according to the Analysis of Failure Model；
Obtain the fault-signal when inverter circuit of the current hysteresis-band control breaks down, by the fault-signal with
Non-faulting signal is contrasted, and obtains comparing result；
The comparing result is matched with the fault signature, judges the inverter of current hysteresis-band control described in the phase
The trouble point of circuit malfunctions.
Further, the fault model includes upper tube fault model and down tube fault model；
The upper tube fault model includes
The down tube fault model includes
Wherein, i0For output current, i*For instruction current,For load inertia time constant, Io+For in upper tube failure
When circuit switching state before flashy output current instantaneous value, Io-For before the circuit switching state in down tube failure in a flash
Output current instantaneous value, U0For the instantaneous value of flashy output voltage before circuit switching state,For instruction current i*
Positive maximum,For instruction current i*Maximum negative value.
Further, the upper tube fault model includes the first upper tube fault model and the second upper tube fault model；
The first upper tube fault model includes：
The second upper tube fault model includes：
Further, the down tube fault model includes the first down tube fault model and the second down tube fault model；
The first down tube fault model includes：
The second down tube fault model includes：
Further, the fault signature obtained according to the Analysis of Failure Model when open fault occurs, including：
First upper tube fault signature is obtained according to the first upper tube Analysis of Failure Model, according to the second upper tube failure
Model analysis obtains the second upper tube fault signature, according to the first upper tube fault signature and the second upper tube fault signature
Upper tube fault signature is obtained, the upper tube fault signature includes：The next cycle occurred from failure, in described instruction electric current i*For
In each positive section, the output current i0For 0；
First down tube fault signature is obtained according to the first down tube Analysis of Failure Model, according to the second down tube failure
Model analysis obtains the second down tube fault signature, according to the first down tube fault signature and the second down tube fault signature
Down tube fault signature is obtained, the down tube fault signature includes：The next cycle occurred from failure, in described instruction electric current i*For
In each negative section, the output current i0For 0.
Further, it is described to be contrasted the fault-signal and non-faulting signal, including：By event in the fault-signal
Next periodic signal that barrier occurs is contrasted with non-faulting signal.
Further, as the output current i0When being distorted, in the output current i0Distortion at set gradually it is multiple
Test point, and judge the output current i at multiple test points0Whether default first threshold is met, if satisfied, then judging
The inverter circuit of the current hysteresis-band control breaks down at the distortion and obtains the fault-signal；
Next periodic signal that failure occurs in the fault-signal sets second threshold, if in the fault-signal
The output current i0Meet the second threshold, then the fault-signal and non-faulting signal are contrasted, contrasted
As a result.
Further, if the comparing result is matched with the upper tube fault signature, the current hysteresis-band control described in the phase
Inverter circuit occur upper tube open fault；If the comparing result is matched with the down tube fault signature, described in the phase
Current hysteresis-band control inverter circuit occur down tube open fault.
Further, for the current hysteresis-band control inverter circuit each phase, using such as above-mentioned any one institute
The inverter open fault diagnostic method for the current hysteresis-band control stated judges that the inverter circuit of the current hysteresis-band control occurs
The trouble point of failure.
Present invention also offers a kind of inverter open fault diagnostic device of current hysteresis-band control, including：
Module is built, for building the inverter circuit of the single-phase current hysteresis-band control when open fault occurs
Fault model；
Analysis module, for obtaining fault signature when open fault occurs according to the Analysis of Failure Model；
Contrast module, the fault-signal when inverter circuit for obtaining the current hysteresis-band control breaks down will
The fault-signal is contrasted with non-faulting signal, obtains comparing result；
Judgment module, for the comparing result to be matched with the fault signature, judges current hysteresis described in the phase
The trouble point that the inverter circuit of ring control breaks down.
A kind of from the above it can be seen that inverter open fault diagnosis side of current hysteresis-band control provided by the invention
Method and device, by building fault model of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs
And fault signature is analyzed accordingly, acquisition is contrasted the fault-signal and non-faulting signal, then by comparing result
The characteristic point so that it is determined that breaking down is matched with fault signature；For each phase of the inverter of the current hysteresis-band control
Diagnosed respectively using identical diagnostic method and diagnostic device, so as to which the inverse of whole current hysteresis-band control is accurately positioned
Become the trouble point of device circuit；This method can be in fast positioning position of failure point in a cycle after failure occurs, positioning speed
Degree is fast, and localization method simplicity is easily achieved；This method changes shadow that is adaptable, and changing from load for ring width
Ring.
Brief description of the drawings
Fig. 1 is the fundamental diagram of three-phase current Hysteresis control inverter circuit of the embodiment of the present invention；
Fig. 2 is the output waveform figure of three-phase current Hysteresis control inverter circuit of the embodiment of the present invention；
Fig. 3 is the flow chart of the inverter open fault diagnostic method of current hysteresis-band control described in the embodiment of the present invention；
Fig. 4 is the simplification figure of the single-phase circuit in current hysteresis-band control inverter circuit of the embodiment of the present invention；
Fig. 5 is that the single-phase circuit in current hysteresis-band control inverter circuit of the embodiment of the present invention is equivalent when continued flow tube turns on
Circuit diagram；
Fig. 6 moves towards schematic diagram for current hysteresis-band control circuital current of the embodiment of the present invention；
Fig. 7 is the first upper tube fault model equivalent circuit diagram of the embodiment of the present invention；
Fig. 8 is the fault condition output current wave figure of the first upper tube failure of the embodiment of the present invention；
Fig. 9 is the second upper tube fault model equivalent circuit diagram of the embodiment of the present invention；
Figure 10 is the fault condition output current wave figure of the second upper tube failure of the embodiment of the present invention；
Figure 11 is the first down tube fault model equivalent circuit diagram of the embodiment of the present invention；
Figure 12 is the fault condition output current wave figure of the first down tube failure of the embodiment of the present invention；
Figure 13 is the second down tube fault model equivalent circuit diagram schematic diagram of the embodiment of the present invention；
Figure 14 is the fault condition output current wave figure of the second down tube failure of the embodiment of the present invention；
Figure 15 is three-phase inverter bridge circuit model schematic of the embodiment of the present invention；
Figure 16 is three-phase inverter bridge circuit model current waveform of the embodiment of the present invention and fault signature extraction figure；
Figure 17 is current transformer malfunction test schematic diagram of the another embodiment of the present invention based on current hysteresis-band control；
Figure 18 tests output current wave and trouble-shooting chart for another embodiment of the present invention open fault；
Figure 19 is that open fault tests current waveform and trouble-shooting chart under ring width situation of change of the embodiment of the present invention；
Figure 20 loads open fault under situation of change for the embodiment of the present invention and tests current waveform and trouble-shooting chart；
Figure 21 is a kind of inverter open fault diagnostic device structure diagram of current hysteresis-band control of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that all statements for using " first " and " second " are for differentiation two in the embodiment of the present invention
The non-equal entity of a same names or non-equal parameter, it is seen that " first " " second " should not only for the convenience of statement
The restriction to the embodiment of the present invention is interpreted as, following embodiment no longer illustrates this one by one.
For the ease of understanding technical solution of the present invention, first to the operation principle of current hysteresis-band control inverter circuit into
Row analysis.
Fig. 1 is the fundamental diagram of three-phase current Hysteresis control inverter circuit of the embodiment of the present invention；Fig. 2 is implemented for the present invention
The output waveform figure of example three-phase current Hysteresis control inverter circuit.
Current hysteresis-band control is a kind of closed-loop control, its fundamental diagram is as shown in Figure 1：UdFor direct voltage source, i*To refer to
Electric current is made, i is that the measured value of actual output current is actual output current, using both deviations as hysteresis comparator
Input, so as to fulfill to power device VnCut-off and be controlled, VDnFor continued flow tube (n=1,2 ..., 6), LXWith RXFor three-phase
The RL loads (X=A, B, C) of load-side.The output waveform figure of circuit Hysteresis control circuit is as shown in Fig. 2, i.e. actual output is electric
Flowing i can be to instruction current i*Into line trace.
Since the structure of each phase of three-phase current Hysteresis control inverter circuit is completely the same, therefore three are based in the present invention
Any one phase of phase current Hysteresis control inverter circuit is analyzed and diagnosed.
The embodiment of the present invention proposes a kind of inverter open fault diagnostic method of current hysteresis-band control, with reference to Fig. 3 institutes
Show, including：
S101, builds failure mould of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs
Type.
S102, fault signature when open fault occurs is obtained according to the Analysis of Failure Model.
S103, obtains the fault-signal when inverter circuit of the current hysteresis-band control breaks down, by the failure
Signal is contrasted with non-faulting signal, obtains comparing result.
S104, the comparing result is matched with the fault signature, judges current hysteresis-band control described in the phase
The trouble point that inverter circuit breaks down.
Wherein, open fault is occurring in the inverter circuit for building the single-phase current hysteresis-band control in step S101
When fault model before, the model of the inverter circuit of current hysteresis-band control need to be built, building process is as follows：
Fig. 4 is the simplification figure of the single-phase circuit in current hysteresis-band control inverter circuit of the embodiment of the present invention.Wherein i*To refer to
Make electric current, ifTo export feedback current, h is the unidirectional ring width of hysteresis comparator, and L, R are respectively the equivalent inductance and electricity of load-side
Resistance, output current i0, output voltage u0, when including counter electromotive force in load, analysis method and result are identical.Load
The side differential equation is
As upper tube V1During conducting, u0=U0, the solution of formula (1) is
Work as VD2Afterflow conducting (it is simple in order to control, at this time to V2Open signal but due to its one-way conduction characteristic and no current
Pass through) when, since the presence of inductance L is so that electric current cannot be mutated, zero output of the circuit equivalent to a RL circuit at this time is rung
Should, shown in equivalent circuit Fig. 5, wherein iL(t) it is inductive current, uR(t) it is the voltage of resistance, uL(t) it is the voltage on inductance.
If inductive current instantaneous value is i in a flash before switchingL(0-)=Io+, then have circuit by Kirchhoff's law
The differential equation：
The solution that the equation can be obtained is：
So as to have
As down tube V2Conducting, i.e. u0=-U0When, the Xie Zewei of formula (1)
Together should VD1Afterflow turns on (V at this time1Situation is same as above V2) when, if inductive current is i in a flash before switchingL
(0-)=Io-, then have
Wherein,For load inertia time constant；A is integral constant, is determined by primary condition；For electric current
Transmission coefficient, theoretical with being defaulted as 1 in simulation model；To export feedback current ifStable state maximum；U0,
Io+, Io-It is flashy instantaneous value before circuit switching state.
Fig. 6 is the current trend schematic diagram of current hysteresis-band control circuit of the embodiment of the present invention.With reference to shown in Fig. 6, in Fig. 2
Ascent stage during current tracking can be described by formula (2) and (7), the decline stage can by formula (5) and (6) come
Description, wherein, s=i*-if, h is the ring width of hysteresis comparator.
The model of inverter circuit based on the current hysteresis-band control, when open fault occurs for IGBT, if upper tube failure
Such as the V in Fig. 11、V3、V5, then the circuit can be influenced in trace command electric current i*Effect in positive section, if upper tube open circuit
Actual output current i is in positive section when failure occurs, and since the presence of inductance L prevents electric current from being mutated, then it will be from
0 (decrease speed is related with the value of inductance L, and specific decline process is corresponding with formula (5)) is dropped to this moment, until instruction current i*
Just start to track when between minus zone；If it is in minus zone, it is in the interior trace command electric current i of minus zone*Until i*Greatly
In equal to 0, i is in instruction current i at this time*To remain 0 in positive section, until instruction current i*Just recover between minus zone with
Track.And work as down tube failure, such as the V in Fig. 12、V4、V6, then the circuit is influenced in trace command electric current i*Effect between minus zone
Fruit, analytic process is similar with positive section, as a result on the contrary, this will not be repeated here.
As the above analysis, the fault model includes upper tube fault model and down tube fault model；Wherein upper tube
Fault model is in upper tube V1、V3、V5Fault model during open fault occurs, down tube fault model is in down tube V2、V4、
V6Fault model during open fault occurs.
The upper tube fault model is
The down tube fault model is
Wherein, i0For output current, i*For instruction current,For load inertia time constant, Io+For in upper tube failure
When circuit switching state before flashy output current instantaneous value, Io-For before the circuit switching state in down tube failure in a flash
Output current instantaneous value, U0For the instantaneous value of flashy output voltage before circuit switching state,For instruction current i*
Positive maximum,For instruction current i*Maximum negative value.
For the ease of analysis, analyzed by taking the A phases of the inverter circuit of current hysteresis-band control of the embodiment of the present invention as an example.
In one embodiment of the invention, the upper tube fault model is included on the first upper tube fault model and second
Pipe fault model.
Wherein, the first upper tube fault model is the instruction current i when failure occurs*>0 situation, is the event of the first upper tube
Barrier.At this time, the equivalent circuit diagram of inverter circuit A phases is as shown in Figure 7 at this time.(the i.e. instruction current when just open fault occurs for V1
It is inSection), equivalent circuit diagram such as Fig. 7 (a) is shown, at this time only continued flow tube VD2Shape is turned in afterflow
State, output current ioThe instantaneous current value I at moment will occur by failureo+0 is dropped to, decline curve slope is related with load, by
The derivation of above-mentioned mathematical model understands have under such fault conditionAs instruction current i*Drop to after 0,
When instruction current is bears (i.e.In section), shown in equivalent circuit such as Fig. 7 (b), the V in this section2
With VD1In normal operating conditions, output current ioNormal tracking DC current i*, so that output current i at this timeoCan be by formula (6)
(7) express；When instruction current turns again to i in next cycle*For it is positive when (i.e.In section), at this time
Shown in equivalent circuit such as Fig. 7 (c), since two pipes are in off-state above and below A circuitry phases at this time, A phases can not be followed the trail of and instruct electricity
Stream, so as to understand output current io(t)=0.So as to understand the output current i under the first upper tube fault conditiono(t) mathematical modulo
Type is (since fault moment)：
It can be obtained by Simulink emulation in V1A phases are defeated in three-phase inverting circuit when the first upper tube failed open failure occurs
It is as shown in Figure 8 to go out current waveform.In the present embodiment, the first upper tube fault condition time of origin of setting of the embodiment of the present invention is
0.204s, point occurs for failure at figure centre circle, in a cycle that failure occurs, output current ioOutput electricity when will thus
Flow instantaneous value Io+Drop to 0 and in instruction current i*Still to remain 0 in positive section, until instruction current i*Into minus zone
Between, then output current starts normal trace instruction electric current, until next cycle starts, in instruction current in positive section
Output current remains 0, circulates ever since.Simultaneously because that influenced when upper tube breaks down is instruction current i*In positive section
Interior tracking effect, so as to be judged according to its affected section come the specific location that failure occurs, such as Fig. 8
It is shown since in instruction current, to lose tracking function in positive section, so as to understand upper tube, there occurs open fault.By Fig. 8
Understand, the waveform of output current is consistent with above-mentioned theory analytical derivation process under the first upper tube fault condition.
Further, the second upper tube fault model is the instruction current i when failure occurs*<0 situation, is the second upper tube
Failure.The equivalent circuit diagram of inverter circuit A phases is as shown in figure 9, analytic process is similar to the first upper tube failure, equivalent to jump at this time
The second upper tube failure special circumstances of first inaction interval, equivalent circuit such as Fig. 9 (a) of its two link included are crossed
(b) shown in.Output current i under the fault conditiono(t) mathematical model is (since fault moment)
It can be obtained by Simulink emulation in V1A phases are defeated in three-phase inverting circuit when the second upper tube failed open failure occurs
It is as shown in Figure 10 to go out current waveform.
In this embodiment, the down tube fault model includes the first down tube fault model and the second down tube failure mould
Type.
Wherein, the first down tube fault model is the i when failure occurs*<0 situation, as occurs the event of the first down tube
During the situation of barrier.At this time, the equivalent circuit diagram of inverter circuit A phases is as shown in figure 11.First down tube failure malfunction analysis procedure with
First upper tube failure is identical, but current direction is on the contrary, result is opposite.Equivalent circuit such as Figure 11 of its three link included
(a) shown in (b) (c).So as to understand output current i in this caseo(t) mathematical model is (since fault moment)：
A phase output current ripples in the three-phase inverting circuit that can be obtained when c class open faults occur for V2 are emulated by Simulink
Shape is as shown in figure 12.
Further, the second down tube fault model is the i when failure occurs*>0 situation, that is, occur the event of the second down tube
The situation of barrier.The equivalent circuit diagram of inverter circuit A phases is as shown in figure 12 at this time.The malfunction analysis procedure and the second upper tube failure phase
Together, but current direction is on the contrary, result is opposite.Shown in equivalent circuit such as Figure 13 (a) (b) of its two link included.The event
Output current i in the case of barriero(t) mathematical model is (since fault moment)：
It can be obtained by Simulink emulation in V2A phases output current ripple in three-phase inverting circuit when such open fault occurs
Shape is as shown in figure 14.
According to the above-mentioned analysis emulated based on mathematical model and Matlab/Simulink, when current hysteresis-band control
When open fault occurs for inverter circuit, its output current wave exists and necessarily has regular distortion, wherein it is the most obvious and
The characteristic value section for being easy to extraction is that io(t)=0, can be quickly and accurately using this fault signature in this section
Diagnosis is mutually carried out to failure and sends alarm, the security reliability run with safeguards system.And mathematical model can with analogue simulation
Substantially to observe that current waveform during upper and lower two pipes failure is also what is had differences, difference is mainly manifested in trace instruction electricity
On the direction of stream, therefore herein according to section residing for the current waveform in the preceding a quarter period zones in guilty culprit cycle
It is positive and negative to judge circuit to occur the specific location of open fault.
Concrete analysis result includes：First upper tube fault signature, root are obtained according to the first upper tube Analysis of Failure Model
The second upper tube fault signature is obtained according to the second upper tube Analysis of Failure Model, according to the first upper tube fault signature and institute
State the second upper tube fault signature and obtain upper tube fault signature, the upper tube fault signature includes：The next cycle occurred from failure,
In described instruction electric current i*For in each positive section, the output current i0For 0.At this time, if next week that failure is occurred
It is poor that the current waveform in phase and non-faulting cycle is made, its difference is negative.
First down tube fault signature is obtained according to the first down tube Analysis of Failure Model, according to the second down tube failure
Model analysis obtains the second down tube fault signature, according to the first down tube fault signature and the second down tube fault signature
Down tube fault signature is obtained, the down tube fault signature includes：The next cycle occurred from failure, in described instruction electric current i*For
In each negative section, the output current i0For 0.At this time, if next cycle and non-faulting cycle that failure is occurred
It is poor that current waveform is made, its difference is just.
Specifically, when relatively, the previous cycle that next cycle that failure occurs occurs with failure can also be compared
Compared with.
Further, it is described to be contrasted the fault-signal and non-faulting signal, including：By event in the fault-signal
Next periodic signal that barrier occurs is contrasted with non-faulting signal.
In another embodiment, as the output current i0When being distorted, due to gathering back in a device
Current signal in interference would generally cause the fluctuation of output current amplitude, therefore in the output current i0Distortion at successively
Multiple test points are set, and judge the output current i at multiple test points0Whether default first threshold is met, if full
Foot, then judge that the inverter circuit of the current hysteresis-band control breaks down at the distortion and obtains the fault-signal.
In one specific embodiment, first threshold is the p%, 0 ＜ p ＜ 100 of output current amplitude.If the output electricity of these test points
Flow i0Respectively less than first threshold, then it can be assumed that this is mutually there occurs failure, avoid judging by accident.
Further, also due to output current width would generally be caused by being disturbed in the current signal gathered back in a device
The fluctuation of value, next periodic signal that failure occurs in the fault-signal sets second threshold, if in the fault-signal
The output current i0Meet the second threshold, then contrasted the fault-signal and non-faulting signal, obtained pair
Compare result.In a specific embodiment, the second threshold is output waveform amplitude q%, 0 ＜ q ＜ 100.Sent out in failure
Second round after life, as output current i0When meeting the second threshold, then carry out contrast and obtain final judging result.
If the comparing result is matched with the upper tube fault signature, the inverter of the current hysteresis-band control described in the phase
Upper tube open fault occurs for circuit；If the comparing result is matched with the down tube fault signature, the current hysteresis described in the phase
Down tube open fault occurs for the inverter circuit of ring control.
Above-described embodiment is the side for a certain phase progress open fault diagnosis of the inverter circuit of current hysteresis-band control
Method, mutually carries out fault diagnosis for the inverter circuit of the current hysteresis-band control other using identical method and apparatus, from
And the trouble point of open fault occurs for the inverter circuit for obtaining whole current hysteresis-band control.In a specific embodiment,
Each phase is diagnosed using single method and apparatus and respective single fault alarm system is set.Therefore when circuit goes out
During existing open fault, it may appear that io(t)=0 this special section, phase that failure occurred is can be determined that by it；Again
Method according to above-described embodiment is mutually diagnosed for what is broken down, you can learns specific trouble point.
It is as follows the present invention provides a specific embodiment for the ease of understanding above-mentioned technical proposal：
Three-phase inverter bridge circuit model constructed by the present embodiment is as shown in figure 15.In Figure 15, V1~V6For IGBT, VD1
~VD6It is to ensure fly-wheel diode that IGBT is set in the system stability of freewheeling period；Capacitance C11~C14And resistance
R11~R14For the part of DC side Support Capacitor, function is stable DC input voltage；Contactor KM2 and resistance R10Group
Into DC side buffer circuit, function is that buffering of the input current realization to circuit is limited in the initiation of charge stage；KM3 and R15Group
Into discharge circuit, function is that electric energy stored in Support Capacitor is being discharged after inverter is stopped；L1It is input reactance
Device；La~LcOutput inductor；Ca~CcIt is noninductive capacitance.
In circuit each phase be additionally arranged at two IGBT up and down simulate the switch of open fault, so as to
Independent fixed-point simulation is carried out to each IGBT open faults state well.On the basis of this model, proposed failure
Detection method is simple and practicable, it is not necessary to additionally increases substantial amounts of equipment and sensor, it is only necessary to detects biphase current ia, ibAnd count
Calculate third phase electric current icMalfunction can be monitored on-line, and when an error occurs being capable of pair event in half period
Barrier is accurately positioned and sends alarm.
If V1Generation open fault i*>0, then A phase current waveforms and fault signature extraction figure are as shown in figure 16 at this time.
Step S201, obtains the fault-signal when inverter circuit of the current hysteresis-band control breaks down.Specifically,
V1The generation open fault moment is 0.204s, it is observed that distortion takes place in output current wave at 0.204s, no longer
Normal trace instruction electric current.
Step 202, as the output current i0When being distorted, in the output current i0Distortion at set gradually it is more
A test point, and judge the output current i at multiple test points0Whether default first threshold is met.
Extraction of the present embodiment for fault signature is to be based on io(t)=0 this special section carries out, due to logical
Crossing interference in the current signal that observation gathers back in a device would generally cause output current amplitude 2-3% to fluctuate, for the area
Between be in a model i there is provided first thresholdo(t)<1.5 (the 5% of output current amplitude) test points 9, time interval are
0.0002s (percent a cycle), 9 test points all detect io(t)<1.5 output high level, then judge the electricity accordingly
There occurs open fault on road.Can be to avoid erroneous judgement, so that output current drops to zero simultaneously after failure generation by the setting
Maintaining certain time determines that it, there occurs failure, just sends fault warning (i.e. in Figure 16 at 0.208s).
Step 203, the phase occurred is determined.
Specifically, in order to distinguish the difference between phase, numerical value enhanced processing is carried out for every phase, system sets 1 table of output
Show A phase faults, 2 represent B phase faults, and 3 represent C phase faults, and 0 represents normal.Due to being to be based on each phase whether each phase alarm is sent
Output current wave, and each phase warning system is mutually independent, it is possible thereby to the mutually progress that open-circuit failure is occurred
Positioning.
Step 204, trouble point is determined.
Gone to judge the direction for losing trace instruction current capacity by the fault waveform of the next inaction interval to break down,
Concurrently it is out of order and positions alarm, as shown in 0.223s in i.e. Figure 16.
Specifically, step 204 further comprises：
It is poor that next periodic signal after failure is occurred is made with non-faulting periodic signal, analyzes according to difference and in advance
Fault signature is compared, so that it is determined that specific trouble point.Preferably, next cycle after failure is occurred can be selected to believe
Number with failure occur before a cycle signal make it is poor.
According to the analysis of above-described embodiment, since upper tube fault signature is from next cycle of failure generation, in the finger
Make electric current i*For in each positive section, the output current i0For 0, thus next periodic signal after failure is occurred with
After non-faulting periodic signal makees difference, its difference is negative.And down tube fault signature is the next cycle occurred from failure, in the finger
Make electric current i*For in each negative section, the output current i0For 0, thus next periodic signal after failure is occurred with
After non-faulting periodic signal makees difference, its difference is just.
According to the characteristics of above-mentioned fault signature, make the module of difference with itself waveform there is provided one in a model, module is set
Delay a cycle, i.e. output waveform and oneself subtracting each other before a cycle are put, 1 is exported if difference is bears, on the contrary output 2,1
Represent upper tube, 2 represent down tube.It can so judge the specific location of trouble point.
Preferably, it is contemplated that the situation of false alarm, the second threshold there is provided alarm just can for output waveform amplitude 70%
Send.It can be seen that in the case of a classes from failure occur (0.204s) to send alarm and carry out mutually positioning (0.208s) only
Used time 0.004s (i.e. five/a cycle), loses since a classes fault condition is difficult to accurate judgement in first inaction interval
The direction of trace ability is gone to, so that (0.223s) ability accurate judgement was needed within the second failure cycle, the used time, 0.019s (connect
Nearly a cycle).The positioning of trouble point is so fast and accurately carried out.
Present invention also offers another specific embodiment, and it is as shown in figure 17 that it tests schematic diagram.It is main in the embodiment
Three-phase bridge converter case, electronic load box and dSPACE DS1007PPC Processor Board are set.Control letter
Number produced by dSPACE, inverter is sent to through I/O interfaces.Relevant sensor signal is transmitted by A/D interfaces.Diagnose mould
Block is monitored each phase current, and data are sent to computer and are handled.Main experiment parameter is as shown in table 1, this reality
Test mainly with V1、V2Method is verified exemplified by open fault.
1 Key Experiment parameter list of table
Respectively in V1、V2Place sets the first upper tube failure, the second upper tube failure and the first down tube failure, the second down tube failure
The open fault of type carries Fault Locating Method to the embodiment of the present invention and verifies, diagnosis oscillogram is as shown in figure 18, examines
It is disconnected to the results are shown in Table 2.Collection monitors each phase current in experiment, and the obvious fault signature of phase current appearance is directed to after open fault occurs
Diagnosed and positioned.
2 fault location code table of table
By taking the first upper tube failure as an example, with reference to shown in Figure 18 (a), failure occurs at 0.205s, by small half period
After can to failure mutually through row position, positioning is completed to failure pipe in one cycle, whole diagnosis process can be controlled one
Within a cycle.Mutually each pipe each in the present embodiment all has itself independent diagnosis and unique fault signature, and to failure
The extraction of feature sets certain threshold value with judgement, the mistaken diagnosis false alarm situation not broken down, finally according to output
High level contrast fault location code table (as shown in table 2) position where the power tube of failure can be inquired.
The switching frequency of current transformer based on current hysteresis-band control is not a definite value under certain ring width, because electric current
The particularity of Hysteresis control, it can be fluctuated within the specific limits, and ring width is smaller, and frequency is higher, and ring width is bigger, and frequency is lower, such as
The fault signature extraction figure that ring width is arranged under the conditions of 0.5A, 1.0A is followed successively by shown in Figure 19 (a) (b), as we can see from the figure
With the increase of ring width, output current wave precision declines, and ability of tracking dies down, and obvious sawtooth-like waveform occurs, this is all
It is the performance that switching frequency declines, but the fault signature extraction that the present invention is taken is to be based on io(t)=0 with losing tracking energy
The obvious feature in two, direction of power, the change of ring width influence it less, can still realize well failure mutually alarm and
The positioning function of failure pipe, so that the adaptability that this method changes for ring width is very strong.
Load change is a kind of situation common in practical application, is changed for verification present invention method for load
Adaptive capacity, spy be provided with two groups of experiments, first group disconnects one group of load (original two group of one mould one when being arranged on 0.168s
The load of sample works at the same time), fault signature extraction figure at this time is as shown in Figure 20 (a), due to the control mesh of current hysteresis-band control
Mark is electric current, can be still that by for the change of load for instruction in the curent change scope that inductance value can be born
The tracking effect of electric current, so that waveform does not have too big change, the positioning for failure will not have an impact；Second group according to
It is so to set saltus step as shown in Figure 20 (b), to improve command current value at this time at 0.168s, allows output current to take tracking to become
Instruction current after having changed, so that output current value is also changed, but the failure needed for by this paper institutes extracting method
Characteristic value can't be impacted because of the change of current amplitude, and shadow is produced so as to will not mutually alarm failure and be positioned with failure pipe
Ring.It can thus be appreciated that institute of embodiment of the present invention extracting method will not be influenced be subject to load change.
In addition, the embodiment of the present invention additionally provides a kind of inverter open fault diagnostic device of current hysteresis-band control, ginseng
According to shown in Figure 21, including：
Module 11 is built, for building the inverter circuit of the single-phase current hysteresis-band control when open fault occurs
Fault model.
Analysis module 12, for obtaining fault signature when open fault occurs according to the Analysis of Failure Model.
Contrast module 13, the fault-signal when inverter circuit for obtaining the current hysteresis-band control breaks down,
The fault-signal and non-faulting signal are contrasted, obtain comparing result.
Judgment module 14, for the comparing result to be matched with the fault signature, judges electric current described in the phase
The trouble point that the inverter circuit of Hysteresis control breaks down.
Preferably, the fault model includes upper tube fault model and down tube fault model；
The upper tube fault model includes
The down tube fault model includes
Wherein, i0For output current, i*For instruction current,For load inertia time constant, Io+For in upper tube failure
When circuit switching state before flashy output current instantaneous value, Io-For before the circuit switching state in down tube failure in a flash
Output current instantaneous value, U0For the instantaneous value of flashy output voltage before circuit switching state,For instruction current i*
Positive maximum,For instruction current i*Maximum negative value.
Preferably, the upper tube fault model includes the first upper tube fault model and the second upper tube fault model；
The first upper tube fault model includes：
The second upper tube fault model includes：
Preferably, the down tube fault model includes the first down tube fault model and the second down tube fault model；
The first down tube fault model includes：
The second down tube fault model includes：
Further, the analysis module 12 is additionally operable to：First upper tube is obtained according to the first upper tube Analysis of Failure Model
Fault signature, the second upper tube fault signature is obtained according to the second upper tube Analysis of Failure Model, according to first upper tube event
Hinder feature and the second upper tube fault signature obtains upper tube fault signature, the upper tube fault signature includes：Sent out from failure
Raw next cycle, in described instruction electric current i*For in each positive section, the output current i0For 0；
First down tube fault signature is obtained according to the first down tube Analysis of Failure Model, according to the second down tube failure
Model analysis obtains the second down tube fault signature, according to the first down tube fault signature and the second down tube fault signature
Down tube fault signature is obtained, the down tube fault signature includes：The next cycle occurred from failure, in described instruction electric current i*For
In each negative section, the output current i0For 0.
Further, the contrast module 13 is additionally operable to：By in the fault-signal failure occur next periodic signal with
Non-faulting signal is contrasted.
Further, as the output current i0When being distorted, in the output current i0Distortion at set gradually it is multiple
Test point, and judge the output current i at multiple test points0Whether default first threshold is met, if satisfied, then judging
The inverter circuit of the current hysteresis-band control breaks down at the distortion and obtains the fault-signal；
Next periodic signal that failure occurs in the fault-signal sets second threshold, if in the fault-signal
The output current i0Meet the second threshold, then the fault-signal and non-faulting signal are contrasted, contrasted
As a result.
Further, the judgment module is additionally operable to：If the comparing result is matched with the upper tube fault signature, the phase
Upper tube open fault occurs for the inverter circuit of the current hysteresis-band control；If the comparing result is special with the down tube failure
The inverter circuit generation down tube open fault of sign matching, the then current hysteresis-band control described in the phase.
It is to sum up shown, the inverter open fault diagnostic method and device of a kind of current hysteresis-band control provided by the invention,
By building fault model of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs and dividing accordingly
Fault signature is separated out, acquisition is contrasted the fault-signal and non-faulting signal, then comparing result and failure is special
Sign is matched the characteristic point so that it is determined that breaking down；Each mutually use for the inverter of the current hysteresis-band control is identical
Diagnostic method and diagnostic device diagnosed respectively, so as to which the inverter circuit of whole current hysteresis-band control is accurately positioned
Trouble point；This method can be in fast positioning position of failure point in a cycle after failure occurs, and locating speed is fast, and fixed
Position method simplicity is easily achieved；This method changes influence that is adaptable, and changing from load for ring width
Those of ordinary skills in the art should understand that：The discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under the thinking of the present invention, above example
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other changes of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, can in the attached drawing provided
To show or can not show that the known power ground with integrated circuit (IC) chip and other components is connected.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this have also contemplated that following facts, i.e., on this
The details of the embodiment of a little block diagram arrangements be the platform that height depends on implementing the present invention (that is, these details should
It is completely in the range of the understanding of those skilled in the art).Elaborating detail (for example, circuit) with the description present invention's
In the case of exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case of or implement the present invention in the case that these details change.Therefore, these descriptions are considered as illustrating
It is property rather than restricted.
Although having been incorporated with specific embodiment of the invention, invention has been described, according to retouching above
State, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, other memory architectures (for example, dynamic ram (DRAM)) can use discussed embodiment.
The embodiment of the present invention be intended to fall within the broad range of appended claims it is all it is such replace,
Modifications and variations.Therefore, within the spirit and principles of the invention, any omission, modification, equivalent substitution, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
- A kind of 1. inverter open fault diagnostic method of current hysteresis-band control, it is characterised in that including：Build fault model of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs；Fault signature when open fault occurs is obtained according to the Analysis of Failure Model；Obtain the fault-signal when inverter circuit of the current hysteresis-band control breaks down, by the fault-signal with it is non-therefore Barrier signal is contrasted, and obtains comparing result；The comparing result is matched with the fault signature, judges the inverter circuit of current hysteresis-band control described in the phase The trouble point broken down.
- 2. the inverter open fault diagnostic method of current hysteresis-band control according to claim 1, it is characterised in that described Fault model includes upper tube fault model and down tube fault model；The upper tube fault model includesThe down tube fault model includesWherein, i0For output current, i* is instruction current,For load inertia time constant, Io+For the electricity in upper tube failure The instantaneous value of flashy output current, I before the switching state of roado-To be flashy defeated before the circuit switching state in down tube failure Go out the instantaneous value of electric current, U0For the instantaneous value of flashy output voltage before circuit switching state,For instruction current i*Just To maximum,For instruction current i*Maximum negative value.
- 3. the inverter open fault diagnostic method of current hysteresis-band control according to claim 2, it is characterised in that described Upper tube fault model includes the first upper tube fault model and the second upper tube fault model；The first upper tube fault model includes：The second upper tube fault model includes：
- 4. the inverter open fault diagnostic method of current hysteresis-band control according to claim 3, it is characterised in that described Down tube fault model includes the first down tube fault model and the second down tube fault model；The first down tube fault model includes：The second down tube fault model includes：
- 5. the inverter open fault diagnostic method of current hysteresis-band control according to claim 4, it is characterised in that described Fault signature when open fault occurs is obtained according to the Analysis of Failure Model, including：First upper tube fault signature is obtained according to the first upper tube Analysis of Failure Model, according to the second upper tube fault model Analysis obtains the second upper tube fault signature, is obtained according to the first upper tube fault signature and the second upper tube fault signature Upper tube fault signature, the upper tube fault signature include：In the next cycle occurred from failure, be positive in described instruction electric current i* In each section, the output current i0For 0；First down tube fault signature is obtained according to the first down tube Analysis of Failure Model, according to the second down tube fault model Analysis obtains the second down tube fault signature, is obtained according to the first down tube fault signature and the second down tube fault signature Down tube fault signature, the down tube fault signature include：In the next cycle occurred from failure, be negative in described instruction electric current i* In each section, the output current i0For 0.
- 6. the inverter open fault diagnostic method of current hysteresis-band control according to claim 5, it is characterised in that described The fault-signal and non-faulting signal are contrasted, including：Next cycle that failure in the fault-signal is occurred believes Number contrasted with non-faulting signal.
- 7. the inverter open fault diagnostic method of current hysteresis-band control according to claim 6, it is characterised in that work as institute State output current i0When being distorted, in the output current i0Distortion at set gradually multiple test points, and judge multiple institutes State the output current i at test point0Whether default first threshold is met, if satisfied, then judging the current hysteresis-band control Inverter circuit breaks down at the distortion and obtains the fault-signal；Next periodic signal that failure occurs in the fault-signal sets second threshold, if described in the fault-signal Output current i0Meet the second threshold, then the fault-signal and non-faulting signal are contrasted, obtain comparing result.
- 8. the inverter open fault diagnostic method of current hysteresis-band control according to claim 7, it is characterised in that if institute State comparing result to match with the upper tube fault signature, then upper tube occurs for the inverter circuit of the current hysteresis-band control described in the phase Open fault；If the comparing result is matched with the down tube fault signature, the inversion of the current hysteresis-band control described in the phase Down tube open fault occurs for device circuit.
- 9. the inverter open fault diagnostic method of the current hysteresis-band control according to claim 1 to 8 any one, it is special Sign is, for each phase of the inverter circuit of the current hysteresis-band control, using such as claim 1 to 8 any one institute The inverter open fault diagnostic method for the current hysteresis-band control stated judges that the inverter circuit of the current hysteresis-band control occurs The trouble point of failure.
- A kind of 10. inverter open fault diagnostic device of current hysteresis-band control, it is characterised in that including：Module is built, for building failure of the inverter circuit of the single-phase current hysteresis-band control when open fault occurs Model；Analysis module, for obtaining fault signature when open fault occurs according to the Analysis of Failure Model；Contrast module, the fault-signal when inverter circuit for obtaining the current hysteresis-band control breaks down, by described in Fault-signal is contrasted with non-faulting signal, obtains comparing result；Judgment module, for the comparing result to be matched with the fault signature, judges Hysteresis Current control described in the phase The trouble point that the inverter circuit of system breaks down.
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