CN105242139B - A kind of static frequency changer triggering state detection method - Google Patents
A kind of static frequency changer triggering state detection method Download PDFInfo
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- CN105242139B CN105242139B CN201510650901.XA CN201510650901A CN105242139B CN 105242139 B CN105242139 B CN 105242139B CN 201510650901 A CN201510650901 A CN 201510650901A CN 105242139 B CN105242139 B CN 105242139B
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Abstract
The invention discloses a kind of static frequency changer triggering state detection method, when static frequency changer loop current reference value is more than startup threshold values, special time section after trigger pulse output, biphase current feature according to commutation is participated in judges the conducting state of IGCT, and using three-phase current relation as locking criterion, quick turn on thyristors state-detection is realized, while detectable current measurement circuit is abnormal.The Current Waveform Characteristics when present invention utilize commutation, can Quick static frequency changer IGCT open exception, current measurement circuit exception.The detection speed of this method is fast, can well adapt to the frequency conversion operating mode of static frequency changer pusher side current transformer, and operand is small, is easy to software realization.
Description
Technical field
The present invention relates to a kind of static frequency changer triggering state detection method.
Background technology
As shown in Figure 1 and Figure 2, adopted as a kind of autocontrol current source type synchronous motor frequency changing driving system, static frequency changer
It is power component with phase controlled thyristors, IGCT reliably turns on and commutation is the work premise of static frequency changer.
Thyristor failure, trigger circuit exception, bridge commutation failure etc. all can cause static frequency changer system can not be just
Often work, or even there is bridge arm direct pass, excessively stream, the unit starting consequence such as unsuccessfully.Therefore, turn on thyristors is fast and accurately detected
State, it is significant to static frequency changer system.
In order to realize IGBT group state-detection, conventional method usually requires adjunct circuit, and does not consider static frequency-conversion
The operating mode of device output frequency wide variation.
The content of the invention
The purpose of the present invention is：It is proposed a kind of static frequency changer triggering state detection method, this static frequency changer triggering shape
State detection method adapts to static frequency changer frequency conversion operating mode, while detectable current measurement circuit is abnormal.
The present invention adopts the technical scheme that：A kind of static frequency changer triggering state detection method, works as loop as shown in Figure 2
Current reference value is more than threshold values Iref_min, in the rising edge of static frequency changer thyristor triggering impulse, starting duration tμTiming
Device, tμ1. calculated according to formula, threshold values Iref_minCan fixed value adjusting.
If in time tμInterior, the electric current of the IGCT is no more than threshold values IT, then Cutoff current Wave anomaly.For altogether
Anode IGCT, if time tμIt is interior, not less than threshold values-IT, then Cutoff current Wave anomaly.
In order to prevent being judged by accident caused by current measurement circuit abnormal (such as CT broken strings), when judgement is triggered thyristor current flows ripple
During shape exception, start formula 2. described anti-error criterion：
Formula 2. in, inParticipate in another phase current of commutation, imTo have neither part nor lot in the current value of commutation.
If meet the criterion of formula 2., then it is assumed that be triggered turn on thyristors exception, can definite value selection act in alarm or
Tripping operation；Otherwise, it is determined that it is current measurement circuit failure.
The beneficial effects of the invention are as follows：, can Quick static frequency changer crystalline substance lock using Current Waveform Characteristics during commutation
Pipe opens exception, current measurement circuit exception.The detection speed of this method is fast, can well adapt to the change of static frequency changer pusher side
The frequency conversion operating mode of device is flowed, operand is small, is easy to software realization.
Brief description of the drawings
Fig. 1 is the common topology of static frequency changer：
ICB is input breaker；
TLS is input transformer；
DS is output disconnecting link；
G is dragged generator；
Ld is smoothing reactor；
CLS is 6 pulse wave net side thyristor current transformers；
CMS is 6 pulse wave pusher side thyristor current transformers；
PT1 is voltage on line side transformer group；
PT2 is pusher side voltage transformer group；
CT1 is net side current transformer current transformer group；
CT2 is pusher side current transformer current transformer group；
iA、iB、iCThe respectively line current of ABC three-phases.
Fig. 2 is IGCT fully controlled bridge three-phase current waveform：
CP1, CP2, CP3, CP4, CP5, CP6 are 6 road trigger pulses.
VT1, VT2, VT3, VT4, VT5, VT6 are 6 IGCTs of three-phase full-controlled bridge.
Fig. 3 is trigger pulse Cleaning Principle schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings, this method is described in detail.Installed respectively in the AC three-phase of static frequency changer unsteady flow bridge
Current sensor.Below with A phase current values iAExemplified by illustrate, as shown in Fig. 2 when loop current reference value is more than threshold values Iref_min,
In IGCT VT1 trigger pulses CP1 rising edge, start timer.If in whole timing time tμIt is interior, it is unsatisfactory for iA>
IT, then Cutoff current Wave anomaly, ITFor decision threshold, the factors such as sampling drift are had contemplated that when adjusting.Triggered in IGCT VT4
Pulse CP4 rising edge, start timer, if in tμInside it is unsatisfactory for iA<-IT, then Cutoff current Wave anomaly.During timing
Between tμCan 1. shown common-used formula calculates according to formula：
Formula 1. in, α is Trigger Angle, IdFor loop current value, LcFor commutation inductance value, E is commutation voltage amplitude, ωmTo hand over
Flow the angular frequency of voltage.TΔFor the allowance time.IGCT VT2, VT3, VT5, VT6 make similar process when triggering.
To prevent the extremely caused erroneous judgement of current measurement circuit, increase following locking criterion.As shown in figure 3, when judgement quilt
When triggering thyristor current flows Wave anomaly, enter line 2. described judgement：
If meet the criterion of formula 2., then it is assumed that be the turn on thyristors exception that is triggered, act in alarm or tripping operation；Otherwise,
It is determined as current measurement circuit failure.
Static frequency changer triggering state detection method proposed by the present invention, make use of current wave during static frequency changer commutation
The transient characteristic of shape, can quickly judging IGCT, whether reliably whether triggering and current sensor are abnormal, protect speed faster,
And algorithm can well adapt to the frequency conversion operating mode of static frequency changer, operand is small, is easy to software independent of current first harmonics frequency
Realize.
Claims (4)
- A kind of 1. static frequency changer triggering state detection method, it is characterized in that comprising the following steps：Sample the AC three-phase current of static frequency changer unsteady flow bridge；Judge whether static frequency changer loop current reference value is more than startup threshold values Iref_min；If static frequency changer loop current Reference value is more than startup threshold values Iref_min, then in the t using thyristor triggering impulse rising edge as startingμIn time interval, according to ginseng Judge the conducting state of IGCT with the biphase current measured value of commutation：If the current amplitude for the phase that is triggered is respectively less than threshold values IT, start formula 1. shown criterion；As 1. formula is set up, it is determined as IGCT Conducting is abnormal, otherwise it is assumed that current measurement circuit is abnormal；Formula 1. in, inParticipate in another phase current of commutation, imTo have neither part nor lot in the current value of commutation.
- 2. static frequency changer triggering state detection method according to claim 1, it is characterized in that：Time interval tμBy formula 2. Calculate：Formula 2. in, α is Trigger Angle, IdFor loop current value, LcFor commutation inductance value, E is commutation voltage amplitude, ωmFor alternating current The angular frequency of pressure, TΔFor the allowance time.
- 3. static frequency changer triggering state detection method according to claim 1, it is characterized in that：Threshold values Iref_minBy fixed Value is adjusted.
- 4. static frequency changer triggering state detection method according to claim 1, it is characterized in that：Threshold values ITIt is whole by definite value It is fixed.
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| CN105242139B true CN105242139B (en) | 2018-02-16 |
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| CN110058115B (en) * | 2019-03-28 | 2021-07-16 | 国电南瑞科技股份有限公司 | Power conversion unit of static frequency converter and test method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278758A (en) * | 2013-04-19 | 2013-09-04 | 国家电网公司 | Method and device for testing turn-off characteristics of high power thyristor |
| CN203759149U (en) * | 2014-01-08 | 2014-08-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Apparatus for determining commutation failure of high-voltage DC transmission project |
| CN104316858A (en) * | 2014-11-04 | 2015-01-28 | 北京金自天正智能控制股份有限公司 | Device for monitoring conducting state of thyristors in AC-AC frequency converter |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4301550B2 (en) * | 2003-07-08 | 2009-07-22 | 東芝三菱電機産業システム株式会社 | Test circuit for semiconductor power converter |
| CN103227506B (en) * | 2013-03-25 | 2015-03-25 | 国网智能电网研究院 | Triggering and monitoring unit of converter valve thyristor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278758A (en) * | 2013-04-19 | 2013-09-04 | 国家电网公司 | Method and device for testing turn-off characteristics of high power thyristor |
| CN203759149U (en) * | 2014-01-08 | 2014-08-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Apparatus for determining commutation failure of high-voltage DC transmission project |
| CN104316858A (en) * | 2014-11-04 | 2015-01-28 | 北京金自天正智能控制股份有限公司 | Device for monitoring conducting state of thyristors in AC-AC frequency converter |
| 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 |
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