CN106324472B - A kind of contactless current transformer IGBT module state monitoring method - Google Patents
A kind of contactless current transformer IGBT module state monitoring method Download PDFInfo
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- CN106324472B CN106324472B CN201610819709.3A CN201610819709A CN106324472B CN 106324472 B CN106324472 B CN 106324472B CN 201610819709 A CN201610819709 A CN 201610819709A CN 106324472 B CN106324472 B CN 106324472B
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
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Abstract
The present invention relates to a kind of contactless current transformer IGBT module state monitoring methods, include the following steps：S1：The output current phase of current transformer is measured, and measures the watchcase temperature of current transformer IGBT module；S2：IGBT equivalent turn-off times and IGBT cut-off currents are extracted from output current phase, the IGBT equivalent turn-off times be output current phase high-frequency oscillation signal in correspond to time of first wave head or trough caused by IGBT module shutdown, IGBT cut-off currents are corresponding electric current at the time of starting to occur high-frequency oscillation signal with output current phase；S3：Obtain the turn-off characteristic curve of reflection current transformer IGBT module operating status.Compared with prior art, the present invention can conveniently measure turn-off characteristic of all IGBT devices under different current conditions, suitable for the converter system of various structures, the operational reliability of converter system is helped to improve, has many advantages, such as that simplicity, safety, applicability are good.
Description
Technical field
The present invention relates to a kind of current transformer state monitoring methods, more particularly, to a kind of contactless current transformer IGBT module
State monitoring method.
Background technology
Current transformer is a kind of electrical energy changer, is widely used in generation of electricity by new energy, electric vehicle, rail traffic, aviation
The fields such as space flight and metallurgy.As the core devices of current transformer, IGBT module failure can cause entire converter system to run
It interrupts, or even causes safety accident and heavy economic losses.Therefore, the safety in operation of IGBT module and integrity problem be increasingly
It is prominent.
The process of IGBT failures mostly experience gradual change development, IGBT Condition Monitoring Technologies utilize various detections in real system
With analysis means to reflecting that the various variables of operative state are monitored, and device is worked as in conjunction with system operation historical record
Preceding operating status is assessed.IGBT Condition Monitoring Technologies can effectively improve converter system safety in operation and reliability.One
Aspect, the fault pre-diagnosing technology based on status monitoring can find failure before IGBT module fails and take in time corresponding
Measure improves system operation safety to avoid accident from occurring and heavy economic losses；On the other hand, according to device shape
State information formulates the converter system maintenance project based on state and can effectively reduce downtime, maintenance cost and promote O&M effect
Rate significantly improves the reliability and economy of system operation.
Different according to the type of monitored state variable variable, current IGBT state monitoring methods can be divided into static monitoring techniques
Method and dynamic monitor method.Static monitoring techniques method is in IGBT or when cut-off state measures, and such method is usually surveyed
Measure IGBT saturation voltage drops Vce(sat), short circuit current Isc, leakage current IlkEqual static state variables；Dynamic monitor method is in IGBT
Open or turn off process in measure, such method usually measures IGBT on/off time Ton/Toff, Miller platform electricity
Press Vgp, on/off delay time Tdon/TdoffEtc. dynamic state variables.
[1]Chinese patent CN104849644A discloses a kind of IGBT condition detection circuit and the state-detection sides IGBT
Method measures the collection emitter voltage V of IGBT using specialized circuitryce, and signal is controlled according to the output signal of circuit and IGBT gate poles
Effectively judge IGBT be in open, turn off, abnormal shutdown or short-circuit condition.But after this state monitoring method belongs to failure
Detection, cannot assess the health status of IGBT in real time, therefore can not be identified to initial failure and take phase in time
Measure is answered to avoid accident and loss.
Wen Xian [2]"U.M.Choi,F.Blaabjerg,S.Munk-Nielsen,et al.Condition
monitoring of IGBT module for reliability improvement of power converters[C]
.IEEE Transportation Electrification Conference and Expo,2016:602-607 " utilizes spy
The collector voltage detection circuit very designed and status monitoring algorithm, according to the saturation voltage drop V of IGBTce(sat)With electric current, junction temperature
The variation of operation characteristic the operating status of IGBT module is assessed, improve the reliability of current transformer.But saturation voltage drop number
Value magnitude is very big with DC bus-bar voltage gap and switchs front and back change dramatically, therefore accurate measure of saturation voltage drop fills to measuring
The performance requirements such as resolution ratio, the dynamic characteristic set are higher.In addition, document propose condition detection method need to converter system into
Row is transformed and installs additional measuring device, and field conduct is not easy to.
Wen Xian [3]"P.Sun,C.Gong,X.Du,et al.Condition Monitoring IGBT Module Bond
Wires Fatigue Using Short-Circuit Current Identification[J].IEEE Transactions
On Power Electronics, 2016 " under the premise of not damaging IGBT module, and IGBT short circuit electricity is measured by short circuit experiment
Flow IscIt is monitored with junction temperature, the relationship of gate voltage and para-linkage thread breakage degree, to improve the reliability of IGBT module.But
The method need to reduce IGBT gate voltages in fault detect, can not on-line real time monitoring, Practical is difficult.
Wen Xian [4]"H.Luo,Y.Chen,P.Sun,et al.Junction Temperature Extraction
Approach With Turn-Off Delay Time for High-Voltage High-Power IGBT Modules
[J].IEEE Transactions on Power Electronics,2016,31(7):When 5122-5132 " is by turn-off delay
Between TdoffAs temperature sensitive change measurement IGBT module junction temperature, the health status of prediction power device.The method needs measurement module to send out
Emitter-base bandgap grading and auxiliary transmission interpolar voltage VeE, IGBT is packaged into discrete component in real system or module is mounted in current transformer
Portion, gate pole variable field measure difficult.
Wen Xian [5]"Bryant A T,Mawby P A,Palmer P R,et al.Exploration of power
device reliability using compact device models and fast electro-thermal
simulation[C].IEEE Industry Applications Conference,2006:1465-1472 " and Wen Xian [6]
“Musallam M,Johnson C M,Yin C,et al.Real-time life consumption power modules
prognosis using on-line rainflow algorithm in metro applications[C].IEEE
Energy Conversion Congress and Exposition(ECCE),2010:970-977 " utilizes the compact electric heating of IGBT
Model and current transformer fast electric heating emulation technology, under the conditions of converter system operating condition is continually changing to IGBT module into
Row " online " life prediction.But whether life prediction result accurately depends on model accuracy (device reliability mould in this method
Type, electrothermic model).In view of the complicated various and device state shadow of the dispersibility of device parameters, fault mode in real system
The factors such as junction temperature estimation are rung, the technology current transformer IGBT module service life difficult to realize is accurately predicted.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of contactless unsteady flows
Device IGBT module state monitoring method can be measured conveniently in current transformer using the IGBT equivalent turn-off times as significant condition variable
Turn-off characteristic of all IGBT devices under different current conditions is suitable for the converter system of various structures, helps to improve
The operational reliability of converter system has many advantages, such as that simplicity, safety, applicability are good.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of contactless current transformer IGBT module state monitoring method includes the following steps：
S1：The output current phase i of current transformer is measured using non-contact electric current measurement element, and measures current transformer IGBT moulds
The watchcase temperature T of blockc；
S2：The equivalent turn-off time t of IGBT are extracted from output current phase isw.offWith IGBT cut-off currents Ioff, described
Correspond to caused by IGBT module shutdown first in the high-frequency oscillation signal that the IGBT equivalent turn-off times are output current phase i
The time t of wave head or troughsw.off, the IGBT cut-off currents IoffTo start higher-order of oscillation letter occur with output current phase i
Number at the time of corresponding electric current；
S3：Obtain the IGBT turn-off characteristic curves of reflection current transformer IGBT module operating status, the IGBT turn-off characteristics
Curve is in watchcase temperature TcUnder the equivalent turn-off time t of IGBTsw.offWith IGBT cut-off currents IoffFunctional relation.
The high-frequency oscillation signal refers to oscillator signal of the frequency range in 150kHz~30MHz.
The IGBT turn-off characteristics curve that scene measures is compared with the IGBT turn-off characteristic curves under normal operating conditions,
If the IGBT turn-off characteristic curves that scene measures occur more than the variation of setting allowable range, assert that current transformer IGBT module is transported
Row state changes.
The allowable range that sets is less than or equal to 0.5% as departure absolute value.
The band of the non-contact electric current measurement element is wider than 500kHz.
The watchcase temperature TcThe temperature-measuring element of installation carried using IGBT module or additional is measured.
Compared with prior art, the present invention has the following advantages：
1) engineering construction is easy：With Xian Youjishu [1]-[4]It compares, the method for the present invention is based on being caused by IGBT turn off process
The current transformer output current phase higher-order of oscillation first wave head (or trough) time it is just consistent with IGBT turn off process
Basic principle obtains the switching characteristic of IGBT by measuring current transformer output current phase, and this method need not be inside current transformer
It is implanted into detection circuit, field conduct is easy.
2) safe：With Xian Youjishu [3],[4]It compares, the method for the present invention is by non-contacting mode in engineering site
Measure current transformer output current phase, the current measurement device of use with converter system without directly electrical connection, and can be not
Status monitoring is implemented to IGBT online under the premise of influence system normal operation, it is ensured that the safety of system.
3) applicability is good：Compared with prior art, the method for the present invention is suitable for the converter system of various topological structures.Nothing
By the current transformer (such as three level neutral point clamper current transformers, modular multi-level converter) of which kind of structure, output current phase
The higher-order of oscillation is all that alternation switch generates in certain sequence by each IGBT device inside current transformer.The method of the present invention passes through measurement
Current transformer output current phase higher-order of oscillation feature can obtain the switching characteristic of each IGBT device in the same phase bridge arm of current transformer,
And current transformer IGBT module health status is monitored according to the variation of IGBT turn-off characteristics.
Description of the drawings
Fig. 1 is the method for the present invention work flow diagram；
Fig. 2 is the schematic diagram that the method for the present invention is applied on current transformer；
Fig. 3 is the schematic diagram defined with cut-off current the current transformer IGBT equivalent turn-off times；
Fig. 4 is current transformer IGBT module status monitoring experimental result schematic diagram.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
The present invention is based on first wave head of the output current of converter higher-order of oscillation caused by IGBT turn off process (or waves
Paddy) the time just basic principle consistent with IGBT turn off process, propose a kind of contactless current transformer IGBT module state
Monitoring method includes the following steps as depicted in figs. 1 and 2：
S1：The output current phase i that non-contact electric current measurement element measures current transformer is installed, and installs or utilize IGBT moulds
The included temperature-measuring element of block measures the watchcase temperature T of current transformer IGBT modulec.Wherein, non-contact electric current measurement element
Enough bandwidth are required, band is wider than 500kHz, to measure the high-frequency oscillation signal in current transformer output current phase.It is existing
Field high speed measures output current phase i and watchcase temperature TcAnd continuously record data.
S2：The equivalent turn-off time t of IGBT are extracted from output current phase isw.offWith IGBT cut-off currents Ioff。
As shown in figure 3, the IGBT equivalent turn-off times are defined as the high-frequency oscillation signal of output current phase i by the method for the present invention
In correspond to the time t of first wave head or trough caused by IGBT module shutdownsw.off, and as significant condition variable；
Simultaneously also by IGBT cut-off currents IoffCorresponding electricity at the time of being defined as starting to occur high-frequency oscillation signal with output current phase i
Stream, at the time of as IGBT turn off process starts at the time of output current phase i starts to occur high-frequency oscillation signal.Wherein, high frequency
Oscillator signal refers to oscillator signal of the frequency range in 150kHz~30MHz, corresponds to the frequency of Contacted EMI signal
Range, this frequency range can react the off state of IGBT well, other disturbing factors are smaller.
S3：The IGBT turn-off characteristic curves of reflection current transformer IGBT module operating status are obtained, IGBT turn-off characteristics are defined
Curve is in certain watchcase temperature TcUnder the equivalent turn-off time t of IGBTsw.offWith IGBT cut-off currents IoffFunctional relation.It is logical
The turn-off characteristic curve of current transformer IGBT under condition of different temperatures can be obtained by crossing the data that processing scene measures.It is surveyed using scene
The IGBT turn-off characteristics obtained can implement effectively assessment to current transformer IGBT power module operating status and fault condition.If it was found that
There is a degree of variation (such as deviate, deform) in turn-off characteristic, you can assert that IGBT module operating status changes.
In current transformer IGBT module During Process of Long-term Operation solder layer is easy to happen under temperature cycles and power cycle effect
Aging.Solder layer aging generate rupture, cavity can hinder igbt chip heat loss, cause temperature increase even finally burn
Failure.The method of the present invention can detect that the variation of IGBT module health status, is diagnosed to be power module solder layer in time and occurs always
Change.
Example：Using the method for the present invention to IGBT module in two level current transformer of 380V/10kW three-phases before and after failure
(FF50R12RT4) IGBT turn-off characteristics tsw.off=f (Ioff) be tested.As shown in experimental result picture 4, pass through comparison
IGBT turn-off characteristics f (I before and after failureoff) offset can find that the health status of IGBT module changes.Implementation process is such as
Under：
1. installing current probe in converter system A phase output terminals.Current probe model CP8030A, bandwidth are
50MHz, for measuring the high-frequency oscillation signal in current transformer A phase output current phases and recording cut-off current Ioff.Use thermocouple
Measure IGBT module watchcase temperature Tc.This patent method can monitor the state of all IGBT pipes in certain phase bridge arm, if you need to monitor
The method need to be only extended to other bridge arms by the IGBT of other phase bridge arms, or specific to the circuit where some IGBT outputs
On.
2. each bridge arm of current transformer is using the trouble-free IGBT power module of health, operation converter system is in load condition
(such as nominal load), using high speed digital oscilloscope in-site measurement current transformer output current phase signal and continuously record data,
It measures simultaneously and records IGBT module shell temperature.
3. the equivalent turn-off time, cut-off current and the turn-off characteristic that define according to the method for the present invention are surveyed by handling scene
Data IGBT turn-off characteristic curve f (I when obtaining 25 DEG C of IGBT module watchcase temperatureoff).It is finally all equivalent by what is measured
Turn-off time is stored in two-dimensional table with cut-off current value to obtain the IGBT turn-off characteristic f (I of healthy IGBT moduleoff)_1。
4. converter system is out of service, A phase bridge arm power modules are replaced with to the IGBT power that solder layer aging occurs
Module repeats step 1 to step 3, measures the IGBT turn-off characteristic f (I of aging IGBT moduleoff)_2。
5. by the IGBT turn-off characteristic f (I of healthy IGBT moduleoffThe IGBT turn-off characteristics f of) _ 1 and aging IGBT module
(IoffIt draws in Fig. 4) _ 2.When identical watchcase temperature Tc, under the conditions of flowing through same current, solder layer aging IGBT module
Turn-off time more equivalent than the IGBT of health module IGBT equivalent turn-off times long few tens of nano-seconds, the IGBT turn-off characteristics before and after aging
It is deviated, and degrees of offset is more than the normal allowable range (being caused by measurement error) of setting, the normal permission of setting
Ranging from departure absolute value is less than or equal to 0.5%.Therefore, the IGBT turn-off characteristics measured using scene, can be to current transformer
IGBT power module operating status implements effectively assessment with fault condition.
It analogously, can three level (NPC) clamped to neutral point, modular multilevel (MMC) etc. using the method for the present invention
IGBT module in all kinds of converter systems carries out status monitoring.
Claims (6)
1. a kind of contactless current transformer IGBT module state monitoring method, including：
S1：The output current phase i of current transformer is measured using non-contact electric current measurement element, and measures current transformer IGBT module
Watchcase temperature Tc；
It is characterized in that, further comprising the steps of：
S2：The equivalent turn-off time t of IGBT are extracted from output current phase isw.offWith IGBT cut-off currents Ioff, described IGBT etc.
Imitate the turn-off time be output current phase i high-frequency oscillation signal in correspond to the IGBT module shutdown caused by first wave head or
The time t of person's troughsw.off, the IGBT cut-off currents IoffFor with output current phase i start to occur high-frequency oscillation signal when
Carve corresponding electric current；
S3：Obtain the IGBT turn-off characteristic curves of reflection current transformer IGBT module operating status, the IGBT turn-off characteristics curve
For in watchcase temperature TcUnder the equivalent turn-off time t of IGBTsw.offWith IGBT cut-off currents IoffFunctional relation.
2. a kind of contactless current transformer IGBT module state monitoring method according to claim 1, which is characterized in that institute
It refers to oscillator signal of the frequency range in 150kHz~30MHz to state high-frequency oscillation signal.
3. a kind of contactless current transformer IGBT module state monitoring method according to claim 1, which is characterized in that existing
The IGBT turn-off characteristics curve that field measures is compared with the IGBT turn-off characteristic curves under normal operating conditions, if scene measures
IGBT turn-off characteristic curves occur more than setting allowable range variation, then assert current transformer IGBT module operating status occur
Variation.
4. a kind of contactless current transformer IGBT module state monitoring method according to claim 3, which is characterized in that institute
State set allowable range be departure absolute value be less than or equal to 0.5%.
5. a kind of contactless current transformer IGBT module state monitoring method according to claim 1, which is characterized in that institute
The band for stating non-contact electric current measurement element is wider than 500kHz.
6. a kind of contactless current transformer IGBT module state monitoring method according to claim 1, which is characterized in that institute
State watchcase temperature TcThe temperature-measuring element of installation carried using IGBT module or additional is measured.
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|---|---|---|---|---|
| CN108627709A (en) * | 2017-03-15 | 2018-10-09 | 中电普瑞电力工程有限公司 | A kind of hookup and method of MMC submodules accelerated aging |
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| CN109738773B (en) * | 2018-06-19 | 2021-07-16 | 北京航空航天大学 | IGBT module service life prediction method under non-steady working condition |
| CN110133472B (en) * | 2019-06-04 | 2020-05-19 | 华北电力大学 | Non-contact type working parameter measuring method of IGBT chip |
| CN110501625B (en) * | 2019-09-12 | 2024-03-08 | 荣信汇科电气股份有限公司 | On-line measuring circuit for voltage drop of IGBT saturation tube |
| CN111142002B (en) * | 2020-01-13 | 2022-04-29 | 全球能源互联网研究院有限公司 | Parallel chip temperature uniformity detection method and device |
| CN112067965A (en) * | 2020-09-15 | 2020-12-11 | 哈尔滨理工大学 | IGBT module health state monitoring system capable of predicting service life |
| CN112986784B (en) * | 2021-04-21 | 2021-09-10 | 国网江西省电力有限公司电力科学研究院 | Abnormity identification method and device for high-power welding type IGBT module |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533064A (en) * | 2008-03-14 | 2009-09-16 | 东芝电梯株式会社 | Longevity diagnostic device of power conversion apparatus |
| CN103066819A (en) * | 2012-12-03 | 2013-04-24 | 深圳市汇川技术股份有限公司 | Insulated gate bipolar transistor (IGBT) over-current protection circuit |
| CN104764991A (en) * | 2015-04-17 | 2015-07-08 | 孟异山 | Method for detecting running state of phase-changing circuit thyristor of high-voltage DC converter valve |
| CN105004953A (en) * | 2015-07-21 | 2015-10-28 | 南车株洲电力机车研究所有限公司 | Method for detecting work state of converter |
| KR20150141404A (en) * | 2014-06-10 | 2015-12-18 | (주) 모터에이드 | Inverter and method for contolling the same |
| CN105510792A (en) * | 2015-12-08 | 2016-04-20 | 同济大学 | Current transformer IGBT power module field double-pulse testing system and method |
| WO2016133168A1 (en) * | 2015-02-19 | 2016-08-25 | 国立大学法人九州工業大学 | Method and apparatus for detecting magnetic field distribution of electric current in bonding wires of power semiconductor devices, and method and apparatus for inspection and diagnosis of said distribution |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9431386B2 (en) * | 2014-05-22 | 2016-08-30 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Current sensing of emitter sense insulated-gate bipolar transistor (IGBT) |
-
2016
- 2016-09-13 CN CN201610819709.3A patent/CN106324472B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533064A (en) * | 2008-03-14 | 2009-09-16 | 东芝电梯株式会社 | Longevity diagnostic device of power conversion apparatus |
| CN103066819A (en) * | 2012-12-03 | 2013-04-24 | 深圳市汇川技术股份有限公司 | Insulated gate bipolar transistor (IGBT) over-current protection circuit |
| KR20150141404A (en) * | 2014-06-10 | 2015-12-18 | (주) 모터에이드 | Inverter and method for contolling the same |
| WO2016133168A1 (en) * | 2015-02-19 | 2016-08-25 | 国立大学法人九州工業大学 | Method and apparatus for detecting magnetic field distribution of electric current in bonding wires of power semiconductor devices, and method and apparatus for inspection and diagnosis of said distribution |
| CN104764991A (en) * | 2015-04-17 | 2015-07-08 | 孟异山 | Method for detecting running state of phase-changing circuit thyristor of high-voltage DC converter valve |
| CN105004953A (en) * | 2015-07-21 | 2015-10-28 | 南车株洲电力机车研究所有限公司 | Method for detecting work state of converter |
| CN105510792A (en) * | 2015-12-08 | 2016-04-20 | 同济大学 | Current transformer IGBT power module field double-pulse testing system and method |
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