CN102097963B - Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof - Google Patents
Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof Download PDFInfo
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- CN102097963B CN102097963B CN 201110020297 CN201110020297A CN102097963B CN 102097963 B CN102097963 B CN 102097963B CN 201110020297 CN201110020297 CN 201110020297 CN 201110020297 A CN201110020297 A CN 201110020297A CN 102097963 B CN102097963 B CN 102097963B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 230000001052 transient effect Effects 0.000 claims description 19
- 208000033999 Device damage Diseases 0.000 abstract 1
- 238000011217 control strategy Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
- H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency
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Abstract
The invention relates to a three-phase full-controlled rectifying device capable of preventing device damage at the moment that a three-phase full-controlled rectifier bridge and an alternating current (AC) bus are switched on, and provides a rectifying and current-limiting method suitable for preventing a vast scale of overcurrent from getting out of control when an uncontrollable rectifying phase is unlocked and switched to a controllable rectifying phase during the three-phase full-controlled rectifying process. The three-phase full-controlled rectifying device comprises the three-phase full-controlled rectifier bridge, a direct current (DC) filter capacitor, a three-phase bridge-type inverter and a CPU unit, wherein the AC input end of the three-phase full-controlled rectifier bridge is provided with a current mutual inductor, and a voltage sensor connected with the CPU unit is arranged between the anode and cathode of the DC filter capacitor. The three-phase full-controlled rectifying device is characterized in that any two of the AC input ends of the three-phase full-controlled rectifier bridge are connected in series with a soft charging circuit respectively; and the soft charging circuit comprises a thyristor and a limiting resistor connected with the thyristor in parallel.
Description
Technical field
The present invention relates to the technical field of three-phase fully-controlled rectification, specifically is a kind of three-phase fully-controlled rectifying device and rectification current-limiting method thereof.
Background technology
Fig. 1 is three-phase bridge current transformer back-to-back, and its main part is made up of three-phase bridge rectifier (that is: three-phase full-controlled rectifier bridge A), dc filter capacitor C, three-phase bridge type converter B, comprises auxiliary bodies such as fuse F in addition.Three-phase bridge rectifier is by IGBT module (T
1～T
6) constitute.
As shown in Figure 2, close a floodgate moment at three-phase full-controlled rectifier bridge A and ac bus, on the one hand, because the voltage of dc filter capacitor C can not suddenly change, and initial voltage is 0, on the other hand, because the direct voltage u at dc filter capacitor C two ends
DcDo not set up as yet, so IGBT module (T
1～T
6) uncontrollable.For these reasons, at the beginning of powering on, alternating current is through said IGBT module (T
1～T
6) in fly-wheel diode do not control rectification because the impedance of whole flow cycle is less, and pressure reduction is very big, the short-circuit impact electric current that easy formation is bigger is equivalent to the short circuit with three-phase full-controlled rectifier bridge A this moment.Because the cost problem can not confirmed the power cell component parts by this temporary impact electric current.But, must cause device failure again if do not handle.
In addition, make three-phase full-controlled rectifier bridge A be operated in the controlled rectification stage, said direct voltage u
DcStill the lifting of need charging, need carry out release this moment with the IGBT module, to carry out the High Power Factor rectification, continues dc filter capacitor C is charged and voltage stabilizing.Problem appears at the moment of release charging, and the alternating current amplitude of the three-phase full-controlled rectifier bridge A that flows through increases tens of times suddenly, and direct voltage u
DcAlso occur overcharging and the vibrational stabilization process, as shown in Figure 4.Alternating current has this moment constituted serious threat to said IGBT module.Therefore, in three-phase fully-controlled type switching process, never control the rectification release and switch to controlled rectification during the stage, overcurrent situation out of control significantly can occur, power device has been constituted serious threat.The analysis of causes: the soft charging circuit of IGBT release moment, two thyristor Tr conductings of soft charging link, its influence can be ignored.Suppose that AC side a phase voltage is the highest at this moment, u
Ab, u
AcAll, as shown in Figure 5 greater than 0, because two IGBT (T of same brachium pontis
1And T
2, T
3And T
4, T
5And T
6) logic reciprocal (dc-side short-circuit that causes when preventing two IGBT of same brachium pontis conducting simultaneously) of conducting and shutoff, so hypothesis a phase brachium pontis T at this moment
2End, then T
1Through the fly-wheel diode conducting of IGBT, as shown in Figure 5, if b phase brachium pontis two tubulose attitudes are by T
4Conducting switches to T
3Conducting AC side then will occur and pass through T
1And T
3The phenomenon that is short-circuited; In like manner, c phase brachium pontis T
5During conducting, T
1And T
5The phenomenon that is short-circuited, then current i
aTo uprush; If a phase brachium pontis T
2T is worked as in conducting
4, T
6Cut when logical by disconnected, current i can occur equally
aThe phenomenon that heightens, as shown in Figure 6.
How to solve the problems of the technologies described above, be the technical barrier of this area.
Summary of the invention
The technical problem that the present invention will solve provides a kind of preventing and causes the three-phase fully-controlled rectifying device of device failure in three-phase full-controlled rectifier bridge and ac bus moment of closing a floodgate; And provide a kind of and be suitable in three-phase fully-controlled type switching process; Never control the rectification release and switch to controlled rectification during the stage, prevent overcurrent rectification current-limiting method out of control significantly.
For solving the technical problem that causes device failure in three-phase full-controlled rectifier bridge and ac bus combined floodgate moment; The invention provides a kind of three-phase fully-controlled rectifying device, it comprises: three-phase full-controlled rectifier bridge A, dc filter capacitor C, three-phase bridge type converter B and CPU element; The dc output end of three-phase full-controlled rectifier bridge A links to each other with the two ends of dc filter capacitor C and the dc supply input of three-phase bridge type converter B; CPU element links to each other with the rectification control end of three-phase full-controlled rectifier bridge A and the inversion control end of three-phase bridge type converter B; The ac input end of said three-phase full-controlled rectifier bridge A is provided with the current transformer that links to each other with said CPU element, is provided with the voltage sensor that links to each other with said CPU element between the positive and negative electrode of dc filter capacitor C; It is characterized in that: the one soft charging circuit D of serial connection respectively in any two ac input ends of three-phase full-controlled rectifier bridge A; This soft charging circuit D comprises: thyristor Tr, the current-limiting resistance R parallelly connected with this thyristor Tr.
Further; Said three-phase full-controlled rectifier bridge A comprises three groups of IGBT unit; Each is organized the IGBT unit and comprises: upper and lower IGBT module, and each IGBT module comprises: IGBT and fly-wheel diode, the anode of this fly-wheel diode connects the emitter of IGBT; The negative electrode of diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of said three-phase full-controlled rectifier bridge A; The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of said dc filter capacitor C, and the emitter of the IGBT in each time IGBT module connects the negative pole of said dc filter capacitor C; Each contact of organizing the upper and lower IGBT module in the IGBT unit respectively with three-phase alternating-current supply in one link to each other.
Further; When CPU element records the ac input end connection three-phase alternating-current supply of three-phase full-controlled rectifier bridge A through said current transformer; IGBT in CPU element each thyristor Tr of control and each IGBT module ends, and three-phase full-controlled rectifier bridge A is in does not control rectification state; The fly-wheel diode of each the IGBT module of AC power in said current-limiting resistance R and three-phase full-controlled rectifier bridge A carries out precharge to dc filter capacitor C; Record the direct voltage u at dc filter capacitor C two ends through said voltage sensor when CPU element
DcAfter stable, CPU element triggers each thyristor Tr conducting, with the said current-limiting resistance R of bypass.
For solving in three-phase fully-controlled type switching process; Never controlling the rectification release switches to controlled rectification and occurs overcurrent technical problem out of control significantly during the stage; The invention provides a kind of rectification current-limiting method based on above-mentioned three-phase fully-controlled rectifying device; It is characterized in that: when CPU element began to control three-phase full-controlled rectifier bridge A and works in the controlled rectification state, CPU element detected the three-phase alternating current transient current i of the ac input end of three-phase full-controlled rectifier bridge A through said current transformer
a, i
b, i
c
As said three-phase alternating current transient current i
a, i
b, i
cAbsolute value in maximum I
Max>I
Lim, and the direction of the corresponding transient current of this maximum is to flow into three-phase full-controlled rectifier bridge A, then the corresponding transient current I of this maximum of CPU element control
MaxIGBT in the said IGBT module down that go up mutually at the place ends; Control the said IGBT conducting (but this moment, this phase current was mainly flow through by the fly-wheel diode in the IGBT module on this) of going up in the IGBT module that this is gone up mutually simultaneously; And control all the other two said IGBT that go up in the IGBT module of going up mutually and end; Control the IGBT conducting in these all the other two said IGBT modules down of going up mutually simultaneously, but this moment, this biphase current was flow through by the fly-wheel diode in the IGBT module down mainly.
As said three-phase alternating current transient current i
a, i
b, i
cAbsolute value in maximum I
Max>I
LimAnd the direction of the transient current that this maximum is corresponding is to flow out three-phase full-controlled rectifier bridge A; Then the said IGBT that goes up in the IGBT module that goes up mutually of the corresponding transient current place of this maximum of CPU element control ends; Control the IGBT conducting (but this moment, this phase current was mainly flow through by the fly-wheel diode in the following IGBT module) in this said IGBT module down that goes up mutually simultaneously; And the IGBT that controls in all the other two said down IGBT modules of going up mutually ends, and controls these all the other two said IGBT conductings (but this moment, this biphase current was mainly flow through by the fly-wheel diode in the last IGBT module) of going up in the IGBT module of going up mutually simultaneously.
Said I
LimBe the protection limit value of the IGBT module among the said three-phase full-controlled rectifier bridge A, this protection limit value is the product parameters of IGBT module, can draw through relevant detection or test.
The present invention has positive effect: when (1) three-phase fully-controlled rectifying device of the present invention and the work of rectification current-limiting method thereof; When CPU element records the ac input end connection three-phase alternating-current supply of three-phase full-controlled rectifier bridge A through said current transformer; IGTB in CPU element each thyristor Tr of control and each IGBT module ends, and three-phase full-controlled rectifier bridge A is in does not control rectification state; AC power fly-wheel diode in each IGBT module in said current-limiting resistance R and three-phase full-controlled rectifier bridge A carries out precharge to dc filter capacitor C; Because the existence of resistance R has limited overshoot current; Record the direct voltage u at dc filter capacitor C two ends through said voltage sensor when CPU element
DcAfter stable, CPU element triggers each thyristor Tr conducting, with the said current-limiting resistance R of bypass.This moment is because said direct voltage u
DcHave certain initial voltage, the pressure reduction of three-phase full-controlled rectifier bridge A both sides is less, thereby makes the charging current of dc filter capacitor C less relatively, so be suitable for avoiding causing device failure in three-phase full-controlled rectifier bridge and ac bus moment of closing a floodgate.(2) for solving in three-phase fully-controlled type switching process; Never controlling the rectification release switches to controlled rectification and occurs overcurrent technical problem out of control significantly during the stage; The present invention has adopted three-phase fully-controlled rectification current limliting strategy; This strategy not only can limit three stream three-phase charging currents effectively, and can steadily charge to capacitor, prevents its oscillatory process.
Description of drawings
For content of the present invention is more clearly understood, below basis specific embodiment and combine accompanying drawing, the present invention is done further detailed explanation, wherein
Fig. 1 is the converter topologies of the three-phase full-controlled bridge back-to-back sketch map among the embodiment.
Fig. 2 is the structural representation of said three-phase full-controlled rectifier bridge device.
Fig. 3 is the structural representation with the three-phase full-controlled rectifier bridge device of soft charging circuit.
Fig. 4 is the switching process of the three-phase full-controlled rectifier bridge when adopting soft charging circuit to carry out soft charging, and wherein, wave band 1 is not controlled commutation phase for the band current-limiting resistance; When being the thyristor conducting in the soft charging circuit, wave band 2 do not control commutation phase; Wave band 3 is the controlled rectification stage.
Fig. 5 is the sketch map of three-phase full-controlled bridge switching process, wherein, because IGBT module T
3And T
5In the IGBT conducting, cause a and b mutually, a and c be short-circuited between mutually.
Controlled rectification waveform (releasing process) figure when Fig. 6 is unlimited Flow Policy.
Fig. 7 is controlled rectification waveform (releasing process) figure of band current limliting strategy.
Fig. 8 is the switching figure of the driving logic of three-phase full-controlled rectifier bridge.
Embodiment
See Fig. 1, the three-phase fully-controlled rectifying device of present embodiment comprises: three-phase full-controlled rectifier bridge A, dc filter capacitor C, three-phase bridge type converter B and CPU element; The dc output end of three-phase full-controlled rectifier bridge A links to each other with the two ends of dc filter capacitor C and the dc supply input of three-phase bridge type converter B; CPU element links to each other with the rectification control end of three-phase full-controlled rectifier bridge A and the inversion control end of three-phase bridge type converter B; The ac input end of said three-phase full-controlled rectifier bridge A is provided with the current transformer that links to each other with said CPU element, is provided with the voltage sensor that links to each other with said CPU element between the positive and negative electrode of dc filter capacitor C.
The one soft charging circuit D of serial connection respectively in any two ac input ends of three-phase full-controlled rectifier bridge A; This soft charging circuit D comprises: thyristor Tr, the current-limiting resistance R parallelly connected with this thyristor Tr.
Said three-phase full-controlled rectifier bridge A comprises three groups of IGBT unit; Each is organized the IGBT unit and comprises: upper and lower IGBT module; Each IGBT module comprises: IGBT and fly-wheel diode; The anode of this fly-wheel diode connects the emitter of IGBT, and the negative electrode of diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of said three-phase full-controlled rectifier bridge A; The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of said dc filter capacitor C, and the emitter of the IGBT in each time IGBT module connects the negative pole of said dc filter capacitor C; Each contact of organizing the upper and lower IGBT module in the IGBT unit respectively with three-phase alternating-current supply in one link to each other.
When CPU element recorded the ac input end connection three-phase alternating-current supply of three-phase full-controlled rectifier bridge A through said current transformer, the IGBT in CPU element each thyristor Tr of control and each IGBT module ended, and three-phase full-controlled rectifier bridge A is in does not control rectification state; The fly-wheel diode of each the IGBT module of AC power in said current-limiting resistance R and three-phase full-controlled rectifier bridge A carries out precharge to dc filter capacitor C; Because the existence of resistance R has limited overshoot current; Record the direct voltage u at dc filter capacitor C two ends through said voltage sensor when CPU element
DcAfter stable, CPU element triggers each thyristor Tr conducting, with the said current-limiting resistance R of bypass.This moment is because said direct voltage u
DcHave certain initial voltage, the pressure reduction of three-phase full-controlled rectifier bridge A both sides is less, thereby makes the charging current of dc filter capacitor C less relatively, so be suitable for avoiding causing device failure in three-phase full-controlled rectifier bridge and ac bus moment of closing a floodgate.
The rectification current-limiting method of the three-phase fully-controlled rectifying device of present embodiment; Comprise: when CPU element began to control three-phase full-controlled rectifier bridge A and works in the controlled rectification state, CPU element detected the three-phase alternating current transient current i of the ac input end of three-phase full-controlled rectifier bridge A through said current transformer
a, i
b, i
c
As said three-phase alternating current transient current i
a, i
b, i
cAbsolute value in maximum I
Max>I
LimAnd this maximum instantaneous sense of current is to flow into three-phase full-controlled rectifier bridge A; Then the IGBT in the said IGBT module down that goes up mutually of this maximum instantaneous electric current place of CPU element control is by (and controlling the IGBT conducting of the last IGBT module of this phase; But this moment, this phase current was mainly flow through by the fly-wheel diode in the IGBT module on this); And control all the other two phases saidly go up IGBT in the IGBT module by (and control these all the other two said IGBT conductings of IGBT module down of going up mutually, but this moment, this biphase current was mainly flow through by the fly-wheel diode in the corresponding IGBT module down).
As said three-phase alternating current transient current i
a, i
b, i
cAbsolute value in maximum I
Max>I
LimAnd the direction of the transient current that this maximum is corresponding is to flow out three-phase full-controlled rectifier bridge A; What then went up mutually at this maximum instantaneous electric current place of CPU element control saidly goes up IGBT in the IGBT module by (and controlling the said IGBT conducting of IGBT module down that this is gone up mutually; But this moment, this phase current was mainly flow through by the fly-wheel diode in this said IGBT module down that goes up mutually); And control IGBT in all the other two said down IGBT modules of going up mutually by (and control these all the other two said IGBT conductings of going up the IGBT module of going up mutually, but this moment, these all the other biphase currents were mainly flow through by the corresponding fly-wheel diode of going up in the IGBT module).
Said I
LimBe the protection limit value of the IGBT module among the said three-phase full-controlled rectifier bridge A, this protection limit value is the product parameters of IGBT module, can draw through relevant detection or test.
Said thyristor Tr adopts the one-way SCR of a pair of reversal connection, also can adopt single bidirectional triode thyristor.
The three-phase fully-controlled rectification current limliting strategy of present embodiment:
Make S
xBe the switch function of x phase brachium pontis, x=a, b, c.Work as S
xBe 1 o'clock, conducting is managed in going up of x phase brachium pontis, and following pipe ends; Work as S
xBe 0 o'clock, the pipe of going up of x phase brachium pontis ends the conducting of following pipe.
Suppose direction that ac-side current flows into brachium pontis for just, and make
I
max?=max（|i
a|，|?i
b?|，|i
c|） (1)
Then make I
LimBe the protection limit value of rectifier bridge power device, if alternating current is out-of-limit, promptly
I
max?>?I
Lim (2)
Then the switch control strategy of power device can be switched to by normal High Power Factor rectification control
Wherein, x=a, b, c, y=a, b, c, z=a, b, c, x, y, z is different.
The implication of above-mentioned formula (1)～(3) is: select three-phase alternating current transient current i
a, i
b, i
cMaximum I in the absolute value
Max, if alternating current is out-of-limit, i.e. I
Max>I
Lim, if the x phase current values is out-of-limit, and if i
x>0, S then
xBe 1, S
yAnd S
zBe 0; If i
x<0, S then
xBe 0, S
yAnd S
zBe 1.
Analyze its principle, suppose that the absolute value of a phase current is maximum, and forward is out-of-limit, promptly
This moment, control strategy switched to
(5)
This moment current i
a, i
bAnd i
cRespectively from T
1, T
4And T
6Fly-wheel diode flows through, and continues charging to capacitor C, and is as shown in Figure 2.Because therefore the existing high voltage of dc capacitor can force i
aRoll back in the limits rapidly, as shown in Figure 7.This strategy not only can limit three stream three-phase charging currents effectively, and can steadily charge to capacitor C, prevents its oscillatory process.The switching of three-phase full-controlled rectifier bridge driving logic is as shown in Figure 8, and this logic also can be used for the overcurrent inhibition that rectifier bridge normal high power factor is had suffered journey.
Fig. 8 is that the three-phase fully-controlled type High Power Factor rectifier bridge that comprises the current limliting strategy drives logic diagram, direct voltage reference value
And measured value
Deviation handle through the PI link after electric current d axle component as a reference
(real component), reference current q axle component
(idle component) gets 0; A phase voltage measured value u
aObtain voltage-phase information through the PLL link,
,
According to the coordinate transform acquisition three-phase reference current i of a phase voltage phase information through dq → abc
a, i
bAnd i
c, again with three-phase current measured value i
a, i
bAnd i
cAfter doing difference, carry out the PWM modulation and obtained High Power Factor rectification driving logic.Fig. 8 the latter half is respectively through asking for three-phase current measured value i
a, i
bAnd i
cAbsolute value and maximum, again with the protection limit value I of rectifier bridge power device
LimDo comparison, this logic still is the current-limiting protection strategy as switch logic to select the driven strategy.
Among Fig. 8,
-dc voltage measurement value,
-direct voltage reference value, u
a-a phase voltage measured value, PLL-phase-locked loop, PI---proportional integral link,
-reference current d axle component,
-reference current q axle component, i
a, i
bAnd i
c-a, b, c three-phase current measured value,
-a, b, c three-phase current reference value, I
MaxMaximum in the-three-phase alternating current absolute value, I
LimThe protection limit value of-rectifier bridge power device, S
a, S
b, S
c-a, b, c three-phase brachium pontis drive logic.
The foregoing description only be for clearly the present invention is described and is done for example, and be not to be qualification to execution mode of the present invention.For the those of ordinary skill in affiliated field, can also make other multi-form variation or change on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present invention extended out and still are among protection scope of the present invention.
Claims (4)
1. a three-phase fully-controlled rectifying device comprises: three-phase full-controlled rectifier bridge (A), dc filter capacitor (C), three-phase bridge type converter (B) and CPU element;
The dc output end of three-phase full-controlled rectifier bridge (A) links to each other with the two ends of dc filter capacitor (C) and the dc supply input of three-phase bridge type converter (B); CPU element links to each other with the rectification control end of three-phase full-controlled rectifier bridge (A) and the inversion control end of three-phase bridge type converter (B); The ac input end of said three-phase full-controlled rectifier bridge (A) is provided with the current transformer that links to each other with said CPU element, is provided with the voltage sensor that links to each other with said CPU element between the positive and negative electrode of dc filter capacitor (C); It is characterized in that:
In any two ac input ends of three-phase full-controlled rectifier bridge (A), be connected in series a soft charging circuit (D) respectively; This soft charging circuit (D) comprising: thyristor (Tr), the current-limiting resistance (R) parallelly connected with this thyristor (Tr).
2. three-phase fully-controlled rectifying device according to claim 1; It is characterized in that: said three-phase full-controlled rectifier bridge (A) comprises three groups of IGBT unit; Each is organized the IGBT unit and comprises: upper and lower IGBT module, and each IGBT module comprises: IGBT and fly-wheel diode, the anode of this fly-wheel diode connects the emitter of IGBT; The negative electrode of diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of said three-phase full-controlled rectifier bridge (A); The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of said dc filter capacitor (C), and the emitter of the IGBT in each time IGBT module connects the negative pole of said dc filter capacitor (C); Each contact of organizing the upper and lower IGBT module in the IGBT unit respectively with three-phase alternating-current supply in one link to each other.
3. rectification current-limiting method that is used for three-phase fully-controlled rectifying device as claimed in claim 2; It is characterized in that: when CPU element records the ac input end connection three-phase alternating-current supply of three-phase full-controlled rectifier bridge (A) through said current transformer; IGBT in CPU element control each thyristor (Tr) and each the IGBT module ends, and three-phase full-controlled rectifier bridge (A) is in does not control rectification state; The fly-wheel diode of each the IGBT module of AC power in said current-limiting resistance (R) and three-phase full-controlled rectifier bridge (A) carries out precharge to dc filter capacitor (C); Record the direct voltage (u at dc filter capacitor (C) two ends through said voltage sensor when CPU element
Dc) stable after, CPU element triggers each thyristor (Tr) conducting, with the said current-limiting resistance of bypass (R).
4. the rectification current-limiting method of three-phase fully-controlled rectifying device according to claim 3; It is characterized in that: when CPU element began to control three-phase full-controlled rectifier bridge (A) and works in the controlled rectification state, CPU element detected the three-phase alternating current transient current (i of the ac input end of three-phase full-controlled rectifier bridge (A) through said current transformer
a, i
b, i
c);
As said three-phase alternating current transient current (i
a, i
b, i
c) absolute value in maximum I
Max>I
LimAnd the direction of the transient current that this maximum is corresponding is to flow into three-phase full-controlled rectifier bridge (A); Then the IGBT in the said IGBT module down that goes up mutually of the corresponding transient current place of this maximum of CPU element control ends; Control the said IGBT conducting of going up in IGBT module that this goes up mutually simultaneously, and control all the other two said IGBT that go up in the IGBT module of going up mutually and end, control the IGBT conducting in said all the other two said IGBT modules down of going up mutually simultaneously;
As said three-phase alternating current transient current (i
a, i
b, i
c) absolute value in maximum I
Max>I
LimAnd the direction of the transient current that this maximum is corresponding is to flow out three-phase full-controlled rectifier bridge (A); Then the said IGBT that goes up in the IGBT module that goes up mutually of the corresponding transient current place of this maximum of CPU element control ends; Control the IGBT conducting in said IGBT module down that this goes up mutually simultaneously, and the IGBT that controls in all the other two said IGBT modules down of going up mutually ends, control said all the other two said IGBT conductings of going up in the IGBT module of going up mutually simultaneously;
Said I
LimProtection limit value for the IGBT module in the said three-phase full-controlled rectifier bridge (A).
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| CN 201110020297 CN102097963B (en) | 2011-01-18 | 2011-01-18 | Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof |
| PCT/CN2011/070802 WO2012097529A1 (en) | 2011-01-18 | 2011-01-30 | Fully controlled rectifier device |
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| CN 201110020297 CN102097963B (en) | 2011-01-18 | 2011-01-18 | Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof |
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| US9800134B2 (en) | 2015-02-25 | 2017-10-24 | Rockwell Automation Technologies, Inc. | Motor drive with LCL filter inductor with built-in passive damping resistor for AFE rectifier |
| US9923469B2 (en) | 2016-05-09 | 2018-03-20 | Rockwell Automation Technologies, Inc. | Motor drive filter damping |
| US9837924B1 (en) * | 2016-06-02 | 2017-12-05 | Rockwell Automation Technologies, Inc. | Precharge apparatus for power conversion system |
| WO2019011444A1 (en) | 2017-07-14 | 2019-01-17 | Danfoss Power Electronics A/S | Dc-link capacitor protection |
| CN109327151B (en) * | 2017-07-31 | 2021-04-13 | 天津锐微科技有限公司 | Three-phase broadband alternating current input self-adaptive synchronous rectification circuit and control method |
| CN110224617B (en) * | 2019-07-08 | 2024-03-29 | 维尔纳集电电子科技(福建)有限公司 | Reverse connection preventing silicon controlled rectifier circuit |
| CN113556047A (en) * | 2021-07-26 | 2021-10-26 | 阳光电源股份有限公司 | PWM rectifier and short-circuit protection device and application system thereof |
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| CN102097963A (en) | 2011-06-15 |
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