CN109444609A - Traction convertor life forecast method and device - Google Patents
Traction convertor life forecast method and device Download PDFInfo
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- CN109444609A CN109444609A CN201811559238.2A CN201811559238A CN109444609A CN 109444609 A CN109444609 A CN 109444609A CN 201811559238 A CN201811559238 A CN 201811559238A CN 109444609 A CN109444609 A CN 109444609A
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 33
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- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 25
- 208000014674 injury Diseases 0.000 claims abstract description 25
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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
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides a kind of traction convertor life forecast method and devices, are related to traction convertor life forecast technical field.The device includes current detecting conditioning module and data processing and control module；The current detecting conditioning module includes 6 detection units, and detection flows through the three-phase input aging current of grid-side converter electronic device in traction convertor and the three-phase output aging current of traction invertor electronic device respectively, and is transferred to data processing and control module；The data processing and control module is based on GM (2,1) prediction model, calculates the injury tolerance of each phase electronic device of grid-side converter and each phase electronic device of traction invertor, and carry out life prediction.The present invention realizes the ageing level assessment and life prediction to electronic device in traction convertor, using GM (2,1) the forecast model construction second order albinism differential equation of initial data, increases the fitting precision of ageing process, reduces the life prediction error of traction convertor.
Description
Technical field
The present invention relates to traction convertor life forecast technical fields, use more particularly, to a kind of traction convertor
Life-span prediction method and device.
Background technique
Hybrid power traction converter of motor train unit (Traction converter, abbreviation TC) mainly includes net side unsteady flow
Device (abbreviation GCM) and traction invertor (abbreviation TCM) two subsystems.Electronic device basic body in traction converter of motor train unit
The ageing level of traction convertor, the basic law that there is aging rule class index to be distributed in actual application are showed.
Since the weak exponential law of approximate Matthew effect is often presented in the growth of the EMU volume of the flow of passengers, then lead to the index variation of damage
Accelerator is presented in trend.Therefore, one non-negative quasi- smooth sequence of construction is easy to according to the per unit value of degree of injury, then base
In this sequence construct gray model, the fitting of sequence variation rule is realized until prediction.
During being based on gray prediction, for nonexponential growth or single presentation monotonic increase and monotone decreasing is presented
The initial data of rule, (gray model, abbreviation GM model, GM (1,1) model indicate 1 to currently used GM (1,1) prediction model
Rank, 1 variable Differential Equation Model) to carry out long-acting pre- time determination error larger, and as the growth error of time gradually increases
Add.Therefore, there are also to be reduced for the life prediction error of electronic device in traction converter of motor train unit.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of traction convertor life forecast method and device, it should
Device realizes the ageing level assessment and life prediction to electronic device in traction convertor, is not required to destroy traction convertor
Set building block nor affects on the normal operation of EMU, using GM (2,1) forecast model construction second order of initial data
Albinism differential equation increases the fitting precision of ageing process, reduces the life prediction error of traction convertor.
In a first aspect, the embodiment of the invention provides a kind of traction convertor life forecast devices, comprising: electric current inspection
Survey conditioning module and data processing and control module；
The current detecting conditioning module includes 6 detection units, and detection flows through net side unsteady flow in traction convertor respectively
The three-phase input aging current of device electronic device and the three-phase of traction invertor electronic device export aging current, and are transferred to number
According to processing and control module；
The data processing and control module is based on GM (2,1) prediction model, flows through net side in traction convertor according to described
The three-phase input aging current of current transformer electronic device and the three-phase of traction invertor electronic device export aging current, calculate net
The injury tolerance of each phase electronic device of each phase electronic device and traction invertor of side current transformer, and carry out life prediction.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein institute
Stating device further includes power module；
The power module is respectively current detecting conditioning module and data processing and control module power supply.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein institute
Stating detection unit includes current sensor, conditioning circuit；
The current sensor measurement passes through the aging current of the electric wire of the current sensor；
The output end of the current sensor connects the input terminal of the conditioning circuit；
The output end of the conditioning circuit connects the data processing and control module.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein institute
Stating data processing and control module includes DSP and warning circuit；
The pin 5-10 of the DSP is separately connected 6 detection units of the current detecting conditioning module；
The DSP is based on GM (2,1) prediction model, calculates each phase electronic device and traction invertor of grid-side converter
Each phase electronic device injury tolerance, and carry out life prediction.
Second aspect, the embodiment of the present invention also provide a kind of traction convertor life forecast method, are applied to such as the
Data processing and control module described in one side, comprising:
Receive flow through grid-side converter electronic device in traction convertor three that the current detecting conditioning module is sent
Mutually input aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW；
The three-phase input aging current i of grid-side converter electronic device in traction convertor will be flowed throughA、iB、iCIt is inverse with drawing
The three-phase for becoming device electronic device exports aging current iU、iV、iWAnalog signal be converted to digital signal；
Based on GM (2,1) prediction model, according to flow through grid-side converter electronic device in traction convertor three of acquisition
Mutually input aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW, calculate net side and become
The injury tolerance of each phase electronic device of device and each phase electronic device of traction invertor is flowed, and carries out life prediction.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiments of second aspect, wherein institute
It states based on GM (2,1) prediction model, according to the three-phase input for flowing through grid-side converter electronic device in traction convertor of acquisition
Aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW, calculate grid-side converter
The injury tolerance of each phase electronic device of each phase electronic device and traction invertor, and life prediction is carried out, it specifically includes:
The preceding total Operation mode cycle times N of electronic device damage is obtained according to experimental calculationfWith flow through the electronics device
The aging current I of parteqMapping relations: Nf=f (Ieq)；
The injury tolerance of the electronic device is calculated according to following formula
Wherein, Di=Ni/NfiIt is i-th day accumulating injuring value born, NiIt is the actual condition cycle-index of i-th day experience,
According to Nfi=f (Ieqi) N is calculatedfi, IeqiIt is i-th day aging current for flowing through the electronic device obtained；
The aging current that the electronic device is obtained with predetermined period sampling, the injuring rule for detecting the electronic device are tired
Product value, the injury tolerance based on the electronic device that continued time domain before sampling obtains, establishes second order differential equation, and calculate acquisition
The life expectancy of the electronic device.
In conjunction with the first possible embodiment of second aspect, the embodiment of the invention provides second of second aspect
Possible embodiment, wherein the aging current I of the electronic device is calculated according to following formulaeq:
Wherein, X can use A, B, C, U, V or W.
In conjunction with the first possible embodiment of second aspect, the embodiment of the invention provides the third of second aspect
Possible embodiment, wherein the method also includes:
When the injury tolerance is 1, the electronic device damage, the traction convertor life forecast device is externally reported
It is alert.
In conjunction with the first possible embodiment of second aspect, the embodiment of the invention provides the 4th kind of second aspect
Possible embodiment, wherein the aging current I of the electronic device is calculated according to following formulaeq:
Wherein, iGiIt is the electric current for the transistor that ith sample point flows through the electronic device, iDiIt is ith sample point stream
The electric current of the freewheeling diode of the electronic device is crossed, Np is the meter of the conducting off state of electronic device in an Operation mode cycle
Number.
The third aspect, the embodiment of the invention provides a kind of meters of non-volatile program code that can be performed with processor
Calculation machine readable medium, wherein said program code makes the processor execute the method as described in second aspect.
The embodiment of the present invention brings following the utility model has the advantages that the present invention provides a kind of traction convertor life forecasts
Method and device.The device includes current detecting conditioning module and data processing and control module；The current detecting conditioning module
Including 6 detection units, detection flows through the three-phase input aging current of grid-side converter electronic device in traction convertor respectively
Aging current is exported with the three-phase of traction invertor electronic device, and is transferred to data processing and control module；The data processing
Control module is based on GM (2,1) prediction model, according to the three-phase for flowing through grid-side converter electronic device in traction convertor
The three-phase for inputting aging current and traction invertor electronic device exports aging current, calculates each phase electronics of grid-side converter
The injury tolerance of each phase electronic device of device and traction invertor, and carry out life prediction.The arrangement achieves become to traction
The ageing level assessment and life prediction for flowing electronic device in device, are not required to destroy the set building block of traction convertor, also not
The normal operation for influencing EMU is increased using GM (2,1) forecast model construction second order albinism differential equation of initial data
The fitting precision of ageing process, reduces the life prediction error of traction convertor.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of traction convertor life forecast apparatus structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of major loop topological diagram of hybrid power traction converter of motor train unit provided in an embodiment of the present invention；
Fig. 3 is a kind of power module circuitry of traction convertor life forecast device provided in an embodiment of the present invention
Figure；
Fig. 4 is that a kind of current detecting of traction convertor life forecast device provided in an embodiment of the present invention improves mould
Block circuit diagram；
Fig. 5 is a kind of data processing and control mould of traction convertor life forecast device provided in an embodiment of the present invention
Block circuit diagram；
Fig. 6 is the electronic devices structure figure that the embodiment of the present invention three provides.
Icon: 11- power module；The first power conversion unit of 111-；112- second source converting unit；113- third electricity
Source converting unit；The 4th power conversion unit of 114-；The 5th power conversion unit of 115-；The 6th power conversion unit of 116-；12-
Current detecting conditioning module；T1~T6- current sensor；13- data processing and control module；4- electronic equipment；41- processor；
42- memory；43- communication interface；44- bus.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
It is larger to carry out long-acting pre- time determination error to traction convertor for currently used GM (1,1) prediction model, and with when
Between growth error gradually increase.Based on this, a kind of traction convertor life forecast method provided in an embodiment of the present invention
And device, it can be applied to the ageing level assessment and life prediction to traction converter of motor train unit.
To be used a kind of traction convertor disclosed in the embodiment of the present invention first convenient for understanding the present embodiment
Life predication apparatus describes in detail,
Embodiment one:
The embodiment of the invention provides a kind of traction convertor life forecast devices, as shown in Figure 1, the device packet
It includes: power module 11, current detecting conditioning module 12 and data processing and control module 13.
The major loop topology of hybrid power traction converter of motor train unit is as shown in Figure 2.iA、iB、iCFor in traction convertor
The input current of grid-side converter (GCM), the output voltage e of the input side access bavin electric power packet of GCMA~eC, iU、iV、iWFor
The output electric current of traction invertor (TCM) in traction convertor, UdcFor DC link voltage, R1~R3For GCM net side
Equivalent resistance, L1~L3For the equivalent capacity of GCM net side, TCM is followed by the traction motor work of 4 parallel drives.The master of TC
Circuit is made of 12 IGBT modules, each IGBT module (namely above-mentioned electronic device) is that (insulated gate is double by IGBT
Bipolar transistor chip) and FWD (freewheeling diode chip) composition, belong to GCM and TCM two subsystems, to simplify topology,
Unlisted braking energy absorber element in Fig. 2.
As shown in figure 3, the input terminal connection+110V/-110V DC power supply of power module 11, output end output+5V/-
5V ,+15V1/-15V1 ,+15V2/-15V2 ,+3V/-3V ,+3.3V/-3.3V or+1.8V/-1.8V DC voltage (referred to as, DC).
Power module further includes the first power conversion unit 111, second source converting unit 112, third power conversion unit 113,
Four power conversion units 114, the 5th power conversion unit 115 and the 6th power conversion unit 116.
+ 110V/-110V DC voltage is converted to+5V/-5V DC voltage by the first power conversion unit 111, wherein-
5VDC connects signal ground, is indicated in figure with triangle.+ 5V/-5V the DC voltage output end of first power conversion unit 111 and
Four power conversion units 114, the 5th power conversion unit 115 and the 6th power conversion unit 116 are respectively connected with.
+ 110V/-110V DC voltage is converted to+15V/-15V DC voltage by second source converting unit 112, wherein-
15V1DC connects signal ground.+ 110V/-110V DC voltage is converted to+15V/-15V direct current by third power conversion unit 113
Pressure, wherein+15V2DC connects signal ground.
+ 5V/-5V DC voltage is converted to+3V/-3V DC voltage by the 4th power conversion unit 114.5th power supply turns
It changes unit 115 and+5V/-5V DC voltage is converted into+3.3V/-3.3V DC voltage.6th power conversion unit 116 general+
5V/-5V DC voltage is converted to+1.8V/-1.8V DC voltage, wherein -3V, -3.3V and -1.8V DC connect signal ground respectively.
As shown in figure 4, current detecting conditioning module 12 includes 6 detection units, detection is flowed through in traction convertor respectively
The three-phase input aging current of grid-side converter electronic device and the three-phase of traction invertor electronic device export aging current, and
It is transferred to data processing and control module 13.Each detection unit includes current sensor T1~T6 and conditioning circuit.Traction becomes
Flow the three-phase input aging current i of grid-side converter electronic device in deviceA、iB、iCThe three of bus and traction invertor electronic device
Mutually output aging current iU、iV、iWBus sequentially passes through current sensor T2~T7 respectively.Distinguish current sensor T2~T7
Detect the three-phase input aging current i of grid-side converter electronic device in traction convertorA、iB、iCWith traction invertor electronics device
The three-phase of part exports aging current iU、iV、iW.The +/- power end of current sensor T1~T6 be separately connected power module+
The M output end of 15V1/-15V2 DC voltage output end, T1~T6 connects conditioning circuit.The conditioning circuit phase of 6 detection units
Together, the signal ground in conditioning circuit is indicated with triangle, works as RX2=RX3When, UX2=0.5* (3+UX1)；In addition, UX3=UX2, fortune
Put AX1Buffer action is mainly played, and improves UX2With AX2Between equivalent impedance；Work as RX4=RX6When, UX4=(RX5/RX4)*UX3,
Middle X can use A, B, C, U, V or W.The output end of conditioning circuit uses ADin1~ADin6 label respectively, and is connected to data processing
Control module 13.
Data processing and control module 13 is based on GM (2,1) prediction model, according to flowing through grid-side converter in traction convertor
The three-phase input aging current i of electronic deviceA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、
iW, the injury tolerance of each phase electronic device of grid-side converter and each phase electronic device of traction invertor is calculated, and carry out
Life prediction.
As shown in figure 5, data processing and control module 13 includes DSP and warning circuit.DSP includes 11 pins, 1 He of pin
Pin 2 is separately connected the+3.3V/-3.3V DC voltage output end of power module 11, and pin 3 and pin 4 are separately connected power supply mould
+ 1.8V/-1.8V the DC voltage output end of block 11.Pin 5-10 ADin1~ADin6 label, and be connected respectively to electricity
Conditioning circuit output terminals A Din1~ADin6 of 6 detection units of conditioning module 12 is flowed, to obtain the traction current transformation detected
The three-phase input aging current i of grid-side converter electronic device in deviceA、iB、iCIt is exported with the three-phase of traction invertor electronic device
Aging current iU、iV、iW。
The GPIOA0 mouth of DSP pin 11 connects warning circuit, and pin 11 connects the input lower end of alarm G1, alarm G1
Input upper end pass through current-limiting resistance R1 access+3.3V DC power supply；It is defeated that revised level signal is accessed in the output upper end of G1
Terminal PWMOUT out, PWMOUT pass through pull-up resistor R2 access+110VDC power supply, the output end lower end access -110VDC electricity of G1
Source.
ADin1~ADin6 is respectively connected to 6 road sampling channels of the converter in DSP, so as to will be in traction convertor
The three-phase input aging current i of grid-side converter electronic deviceA、iB、iCAging is exported with the three-phase of traction invertor electronic device
Electric current iU、iV、iWAnalog signal be converted to digital signal.DSP is based on GM (2,1) prediction model again, according to flowing through traction current transformation
The three-phase input aging current i of grid-side converter electronic device in deviceA、iB、iCIt is exported with the three-phase of traction invertor electronic device
Aging current iU、iV、iW, calculate each phase electronic device of grid-side converter and each phase electronic device of traction invertor
Injury tolerance, and life prediction is carried out, the life expectancy time of electronic device is calculated.When (electronic device is electronic device
IGBT module in Fig. 2, including transistor and freewheeling diode) injury tolerance when reaching 1, that is, electronic device has damaged
Bad, the alarm signal that electronic device damages can be sent to warning circuit by DSP, so that device is externally alarmed, to prompt user.
The embodiment of the invention provides a kind of traction convertor life forecast devices, and the arrangement achieves become to traction
The ageing level assessment and life prediction for flowing electronic device in device, are not required to destroy the set building block of traction convertor, also not
Normal operation is influenced, the current degree of aging of traction convertor (injury tolerance) has been accurately calculated, using GM (2,1) prediction model structure
The second order albinism differential equation for having made initial data, increases the fitting precision of ageing process, reduces the longevity of traction convertor
Life prediction error.
Embodiment two:
The embodiment of the invention provides a kind of traction convertor life forecast methods, provide applied to embodiment one
Data processing and control module, method includes the following steps:
S101: flow through grid-side converter electronic device in traction convertor three that current detecting conditioning module is sent are received
Mutually input aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW。
6 road sampling channels of the converter in data processing and control module DSP receive current detecting conditioning module respectively
The three-phase input aging current i for flowing through grid-side converter electronic device in traction convertor sentA、iB、iCAnd traction invertor
The three-phase of electronic device exports aging current iU、iV、iW。
S102: the three-phase input aging current i of grid-side converter electronic device in traction convertor will be flowed throughA、iB、iCWith
The three-phase of traction invertor electronic device exports aging current iU、iV、iWAnalog signal be converted to digital signal.
Converter in data processing and control module DSP will flow through grid-side converter electronic device in traction convertor
Three-phase input aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iWSimulation letter
Number digital signal is converted to, the foundation as detection electronic device damaged condition and life prediction.
S103: it is based on GM (2,1) prediction model, grid-side converter electronic device in traction convertor is flowed through according to acquisition
Three-phase input aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW, calculate net
The injury tolerance of each phase electronic device of each phase electronic device and traction invertor of side current transformer, and it is pre- to carry out the service life
It surveys.
The electronic device of traction convertor in the application is 12 IGBT modules as shown in Figure 2, each IGBT mould
Block is made of a transistor and freewheeling diode.For example, IGBT module G12 is by the transistor Q12 and freewheeling diode in Fig. 2
D12 composition, and so on, IGBT module G62 by Fig. 2 transistor Q62 and sustained diode 62 form.Traction is become
There are mapping relations one by one between service life and its aging current passed through in each electronic device for flowing device.
The total Operation mode cycle times N undergone before electronic device damage is obtained according to experimental calculationfWith flow through electronic device
Aging current IeqMapping relations: Nf=f (Ieq).Traction-coasting-of train is braked as an Operation mode cycle.
For example, present embodiments providing the N obtained by testing testfWith IeqMapping relations:
In train traction-Operation mode cycle of coasting-braking one, corresponding electronics can be calculated according to following formula
The aging current virtual value of device:
Wherein, iGiIt is the electric current for the transistor that ith sample point flows through electronic device, iDiIt is that ith sample point flows through electricity
The electric current of the freewheeling diode of sub- device, Np are the countings of the conducting off state of electronic device in an Operation mode cycle.
The aging current virtual value of corresponding electronic device can also be calculated according to following formula:
Wherein, X can use A, B, C, U, V or W.iXNet in traction convertor is flowed through for what current detecting conditioning module detected
The three-phase input aging current i of side current transformer electronic deviceA、iB、iCWith the three-phase output aging electricity of traction invertor electronic device
Flow iU、iV、iW, that is, the current effective value of phase where corresponding electronic device.
Consider whole electronic devices in GCM and TCM, detect GCM three-phase input (A, B, C) and TCM three-phase output (U,
V, W), and ageing level prediction model is established respectively to each bridge arm (for example, G11 and G12 constitute first bridge arm).At this time
IeqIt is the aging current of corresponding bridge arm.The aging current of bridge arm is equal with the aging current value of electronic device.It may be noted that
It is that, since each bridge arm is made of two electronic devices, the aging current of any one electronic device is regarded as
The aging current of this bridge arm.Similar Ieq6 total, the three-phase of the three-phase input and TCM that respectively correspond GCM exports.
The injury tolerance of electronic device is calculated according to following formula
Wherein, Di=Ni/NfiIt is i-th day accumulating injuring value born, NiIt is the actual condition cycle-index of i-th day experience,
According to Nfi=f (Ieqi) N is calculatedfi, IeqiIt is i-th day aging current for flowing through electronic device obtained.When injury tolerance is 1
Think that electronic device has damaged, traction convertor life forecast device is externally alarmed.
The aging current for obtaining electronic device is sampled with predetermined period, detects the injuring rule accumulated value of electronic device, base
The injury tolerance for the electronic device that continued time domain obtains before sampling, establishes second order differential equation, and calculates and obtain electronic device
Life expectancy.
Based on sampled value under the injuring rule accumulated value detection at certain intervals of train.It is assumed that sequence X (k) is to be measured
Discrete series (its sampling interval can be 1 month, 1 year, be also possible to the several years), the establishment process of grey forecasting model is such as
Under:
1-AGO is carried out to crude sampling sequence to add up, and forms new sequence:
X(1)=X(0)d1={ X(1)(1),X(1)(2) ..., X(1)(n)}
Wherein, d1For sum operator, and
It is cumulative by 1-AGO, it is possible to understand that X (1) is the whitened data of ash quantity data X.That is from given interval
It is studied in train operating data by the general character rule that accumulation extracts its damage data.
X(0)A regressive result sequence are as follows:
X(0)d2={ X(1)(1)d2,X(1)(2)d2..., X(1)(n)d2}
M(0)(k)d2=M(0)(k)-M(0)(k-1)
Wherein, d2For regressive operator.
Pass through X(0)It can construct shown in following formula close to equal value sequence:
X(0)(k)d3=0.5X(1)(k)+0.5X(1)(k-1)
Wherein, d3For close to mean operator.The essence of GM (2,1) algorithm is aiming at the time domain before 1-AGO sequential sampling
Continuous information establishes Second Order with Constant Coefficients linear differential equation shown in following formula:
Wherein, α1~α3For the undetermined coefficient of the differential equation, M can be based on by least square method(1)Dis-crete sample values
It is fitted.Continued time domain solution in above-mentioned Second Order with Constant Coefficients linear differential equation is difficult the discrete calculation process by processor
Obtain corresponding numerical solution.By its right and left in sampling interval (k-1) Ts~kTsIt is approximate after interior integral, it can obtain:
It can be obtained according to least square method:
(β1 β2 β3)=(ATA)-1ATB
It can solve to obtain β according to matrix A and B1~β3, then by β1~β3Bring following formula into:
Solve obtained difference equation, available H(0)(k) express formula by the time series of variable of k, k corresponds to
K-th of sampling interval.If the sampling interval is TsIf the time interval that current time distance starts sampling is MTs, then k=M+1, k
H after=M+2 ..., M point(0)(k) value is exactly calculated damage accumulation value.
Work as H(0)(k)=1 when, accumulated damage to 100%, electronic device has been damaged, and solves k value at this time, if k=λ,
Then the life expectancy of electronic device is λ Ts。
Traction convertor life forecast method provided in an embodiment of the present invention, the traction provided with above-described embodiment one
Current transformer life forecast device technical characteristic having the same reaches identical so also can solve identical technical problem
Technical effect.
Embodiment three:
A kind of electronic equipment provided in an embodiment of the present invention, as shown in fig. 6, electronic equipment 4 includes processor 41, memory
42, the computer program that can be run on the processor is stored in the memory, the processor executes the calculating
The step of method that above-described embodiment two provides is realized when machine program.
Referring to fig. 4, electronic equipment further include: bus 44 and communication interface 43, processor 41, communication interface 43 and memory
42 are connected by bus 44.Processor 41 is for executing the executable module stored in memory 42, such as computer program.
Wherein, memory 42 may include high-speed random access memory (RAM, Random Access Memory),
It may further include nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.By at least
One communication interface 43 (can be wired or wireless) realizes the communication between the system network element and at least one other network element
Connection, can be used internet, wide area network, local network, Metropolitan Area Network (MAN) etc..
Bus 44 can be isa bus, pci bus or eisa bus etc..The bus can be divided into address bus, data
Bus, control bus etc..Only to be indicated with a four-headed arrow convenient for indicating, in Fig. 4, it is not intended that an only bus or
A type of bus.
Wherein, memory 42 is for storing program, and the processor 41 executes the journey after receiving and executing instruction
Sequence, method performed by the device that the stream process that aforementioned any embodiment of the embodiment of the present invention discloses defines can be applied to handle
In device 41, or realized by processor 41.
Processor 41 may be a kind of IC chip, the processing capacity with signal.During realization, above-mentioned side
Each step of method can be completed by the integrated logic circuit of the hardware in processor 41 or the instruction of software form.Above-mentioned
Processor 41 can be general processor, including central processing unit (Central Processing Unit, abbreviation CPU), network
Processor (Network Processor, abbreviation NP) etc..It can also be digital signal processor (Digital Signal
Processing, abbreviation DSP), specific integrated circuit (Application Specific Integrated Circuit, referred to as
ASIC), ready-made programmable gate array (Field-Programmable Gate Array, abbreviation FPGA) or other are programmable
Logical device, discrete gate or transistor logic, discrete hardware components.It may be implemented or execute in the embodiment of the present invention
Disclosed each method, step and logic diagram.General processor can be microprocessor or the processor is also possible to appoint
What conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processing
Device executes completion, or in decoding processor hardware and software module combination execute completion.Software module can be located at
Machine memory, flash memory, read-only memory, programmable read only memory or electrically erasable programmable memory, register etc. are originally
In the storage medium of field maturation.The storage medium is located at memory 42, and processor 41 reads the information in memory 42, in conjunction with
Its hardware completes the step of above method.
Example IV:
It is provided in an embodiment of the present invention it is a kind of with processor can be performed non-volatile program code it is computer-readable
Medium, the method that said program code makes the processor execute the offer of above-described embodiment two.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of traction convertor life forecast device characterized by comprising at current detecting conditioning module and data
Manage control module；
The current detecting conditioning module includes 6 detection units, and detection flows through grid-side converter electricity in traction convertor respectively
The three-phase input aging current of sub- device and the three-phase of traction invertor electronic device export aging current, and are transferred at data
Manage control module；
The data processing and control module is based on GM (2,1) prediction model, flows through net side unsteady flow in traction convertor according to described
The three-phase input aging current of device electronic device and the three-phase of traction invertor electronic device export aging current, calculate net side and become
The injury tolerance of each phase electronic device of device and each phase electronic device of traction invertor is flowed, and carries out life prediction.
2. the apparatus according to claim 1, which is characterized in that further include power module；
The power module is respectively current detecting conditioning module and data processing and control module power supply.
3. the apparatus according to claim 1, which is characterized in that the detection unit includes current sensor, conditioning circuit；
The current sensor measurement passes through the aging current of the electric wire of the current sensor；
The output end of the current sensor connects the input terminal of the conditioning circuit；
The output end of the conditioning circuit connects the data processing and control module.
4. device according to claim 3, which is characterized in that the data processing and control module includes DSP and alarm electricity
Road；
The pin 5-10 of the DSP is separately connected 6 detection units of the current detecting conditioning module；
The DSP be based on GM (2,1) prediction model, calculate grid-side converter each phase electronic device and traction invertor it is every
The injury tolerance of one phase electronic device, and carry out life prediction.
5. a kind of traction convertor life forecast method is applied to data processing according to any one of claims 1-4
Control module characterized by comprising
It is defeated to receive the three-phase for flowing through grid-side converter electronic device in traction convertor that the current detecting conditioning module is sent
Enter aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW；
The three-phase input aging current i of grid-side converter electronic device in traction convertor will be flowed throughA、iB、iCAnd traction invertor
The three-phase of electronic device exports aging current iU、iV、iWAnalog signal be converted to digital signal；
It is defeated according to the three-phase for flowing through grid-side converter electronic device in traction convertor of acquisition based on GM (2,1) prediction model
Enter aging current iA、iB、iCAging current i is exported with the three-phase of traction invertor electronic deviceU、iV、iW, calculate grid-side converter
Each phase electronic device and traction invertor each phase electronic device injury tolerance, and carry out life prediction.
6. according to the method described in claim 5, it is characterized in that, described be based on GM (2,1) prediction model, according to the stream of acquisition
Three-phase input aging current i through grid-side converter electronic device in traction convertorA、iB、iCWith traction invertor electronic device
Three-phase export aging current iU、iV、iW, calculate each phase electronic device of grid-side converter and each phase of traction invertor
The injury tolerance of electronic device, and life prediction is carried out, it specifically includes:
The preceding total Operation mode cycle times N of electronic device damage is obtained according to experimental calculationfWith flow through the old of the electronic device
Galvanic current IeqMapping relations: Nf=f (Ieq)；
The injury tolerance of the electronic device is calculated according to following formula
Wherein, Di=Ni/NfiIt is i-th day accumulating injuring value born, NiIt is the actual condition cycle-index of i-th day experience, according to
Nfi=f (Ieqi) N is calculatedfi, IeqiIt is i-th day aging current for flowing through the electronic device obtained；
The aging current that the electronic device is obtained with predetermined period sampling detects the injuring rule accumulation of the electronic device
Value, the injury tolerance based on the electronic device that continued time domain before sampling obtains, establishes second order differential equation, and calculate and obtain institute
State the life expectancy of electronic device.
7. according to the method described in claim 6, it is characterized in that, calculating the aging electricity of the electronic device according to following formula
Flow Ieq:
Wherein, X can use A, B, C, U, V or W.
8. according to the method described in claim 6, it is characterized by further comprising:
When the injury tolerance is 1, the electronic device damage, the traction convertor life forecast device is externally alarmed.
9. according to the method described in claim 6, it is characterized in that, calculating the aging electricity of the electronic device according to following formula
Flow Ieq:
Wherein, iGiIt is the electric current for the transistor that ith sample point flows through the electronic device, iDiIt is that ith sample point flows through institute
The electric current of the freewheeling diode of electronic device is stated, Np is the counting of the conducting off state of electronic device in an Operation mode cycle.
10. a kind of computer-readable medium for the non-volatile program code that can be performed with processor, which is characterized in that described
Program code makes the processor execute described any the method for claim 5 to 9.
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