CN1033941C - Power shifting apparatus - Google Patents
Power shifting apparatus Download PDFInfo
- Publication number
- CN1033941C CN1033941C CN 94103159 CN94103159A CN1033941C CN 1033941 C CN1033941 C CN 1033941C CN 94103159 CN94103159 CN 94103159 CN 94103159 A CN94103159 A CN 94103159A CN 1033941 C CN1033941 C CN 1033941C
- Authority
- CN
- China
- Prior art keywords
- power
- rectifier
- mentioned
- value
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The described AC/DC power convertor (rectifier) converts AC power into DC power and supplies the DC power to a load. A reference voltage adjusting circuit generates a desired voltage Vdc<*>. A rectifier is designed for an output voltage which is equal to the desired voltage Vdc<*>. A control device compares the voltage across the load and the desired voltage Vdc<*> and generates a command for a pulse width modulator convertor in order to control the pulse width modulator convertor to output power corresponding to the difference between the desired voltage Vdc<*> and the voltage across the load when the voltage across the load drops below the desired voltage Vdc<*>. When the voltage across the load is not less than the desired voltage Vdc<*>, only the rectifier feeds DC voltage power to the load.
Description
The present invention relates to the power-converting device of conversion electric power between AC power and DC load.
Figure 19 is the structure chart that the spy opens the power-converting device always shown in the clear 61-66569 communique.Among the figure, 1 provides the AC power cord from the alternating electromotive force of AC power; 2, the 3rd, transformer; The 4th, the interchange choke of restriction current changing rate; The 5th, pwm converter, the alternating electromotive force that it supplies with AC power is transformed into direct current power, offers DC load 9, and the direct current power with DC load 9 regeneration is transformed into alternating electromotive force simultaneously, feeds back to AC power; The 6th, rectifier, it is in parallel with PWM interchanger 5 with the direct current choke 7 series connection backs that are connected a terminal of direct current outlet side, and the alternating electromotive force that AC power is supplied with is transformed into direct current power, offers DC load 9; The 7th, the direct current choke; The 8th, be connected on the filtering capacitor between the dc output end of PWM interchanger 5; The 9th, the DC load of current transformer and so on.
Below its operation principle is described.
Power-converting device carries out power running and regeneration operating, and the former will be transformed into direct current power by the alternating electromotive force that AC power cord 1 is supplied with by AC power, offer DC load 9; The latter then is transformed into alternating electromotive force with the direct current power of DC load 9 regeneration, feeds back to AC power.At first the power running situation is described.
When power running, the alternating electromotive force that the pwm converter 5 of controlled parts (not shown) control is supplied with AC power is transformed into direct current power, offers DC load 9.At that time, the direct current strength of supply is corresponding to the capacity of DC load 9.That is, when the capacity of DC load 9 increases, for fear of electricity shortage, and the direct current strength of increasing supply.When the capacity of DC load 9 reduces, then reduce the direct current strength of supplying with, to avoid the state of direct current power surplus.
When power running, must guarantee DC load 9 steady operations.For this reason, pwm converter 5 is at the direct voltage V that keeps being applied on the DC load 9
DcProvide direct current power under (equating) constant situation with the direct voltage that is applied on the filtering capacitor 8.That is pwm converter 5 is to keep adding dc voltage value V on the DC load 9
DcWith assigned voltage value V as the rated voltage of DC load 9
Dc *Work under the corresponding to situation.
If the capacity change of DC load 9, then added dc voltage value V on the filtering capacitor 8
DcAlso will change.For example, when the capacity of DC load 9 increased, then DC load 9 be because of must remedying the deficiency of amount of power supply, and obtained the part of deficiencies from filtering capacitor 8, thus the direct voltage V that is applied on the filtering capacitor 8
DcTo reduce.In this case, control assembly is according to dc voltage value V
DcWith assigned voltage value V
Dc *Difference control pwm converter 5, make direct voltage V
DcValue and assigned voltage value V
Dc *Consistent.
But it is limited that 5 of pwm converters can provide the capacity of direct current power.When the capacity of DC load 9 increases to essential value when above, with the supply of the direct current power partly that can not get going beyond the limit.In case pwm converter 5 overloads, then the dc voltage value V that is applied on the filtering capacitor 8
DcJust begin to descend.
The value V of the VD of rectifier 6
DcSet for and be lower than assigned voltage value V
Dc *Thereby, not taking place at pwm converter 5 under the normal condition of overload, the diode element of rectifier 6 is in reverse biased state, rectifier 6 running that is not used as power.But, if the numerical value V of the direct voltage that is applied on the filtering capacitor 8
DcReduce, in case be lower than the numerical value V of rectifier 6 VD
Dd, then reverse biased state is disengaged, and enters the positive bias state.Thereby rectifier 6 carries out power running.
Rely on the effect of rectifier 6, overload is avoided, the numerical value V of the direct voltage that is applied on the filtering capacitor 8
DcRise, with assigned voltage value V
Dc *Reach consistent.
When regeneration operating, DC load 9 direct current power of regenerating, therefore, the value V of the direct voltage that is applied on the filtering capacitor 8
DcRise.Control assembly the same pwm converter 5 of controlling during with power running makes the value V of direct voltage
DcWith assigned voltage value V
Dc *Unanimity, under its control, pwm converter 5 is transformed into alternating electromotive force with the direct current power of DC load 9 regeneration, feeds back to AC power.
As the power-converting device of conversion electric power between AC power and DC load, there is the spy shown in Figure 20 and 21 to open disclosed device in the clear 59-70185 communique.Among the figure, the 10th, high speed fusible link, the 11st, derailing switch, the 12nd, the current-limiting resistance of using during initial charge.
Power-converting device structure in the past as above, thereby, if pwm converter 5 on overload takes place.Rectifier 6 beginning power runnings then, thus can provide electric power to DC load 9 above the capacity of pwm converter 5.So,, also it can be eliminated even on the pwm converter 5 overload takes place.But the problem of existence is, just in case the value V of overload direct voltage when taking place
DcDescend sharp, then the work to DC load 9 will produce obstruction.
In addition, when overload took place, the existing quantitative electric current of maximum flow through in the pwm converter 5, thereby can not increase electric current for adjusting reactive power.So can not adjust the problem of reactive power when also existing overload to take place in fact.
Rectifier 6 only limits to carry out power running when overload takes place pwm converter 5, is not taking place under the normal condition of overload, and running is not used as power.Therefore, in the normal state, pwm converter 5 has to provide all electric power.Thereby, cause occurring the capacity of pwm converter 5 with the problem that increases.
In addition, if the overload duration is longer, can flow through higher harmonic current in the rectifier 6.This will produce this higher harmonic current and flow back to AC power, and cause the problem of all obstacles to electric power system.
The present invention addresses the above problem and the achievement studied.Purpose is to obtain a kind of power-converting device, even this device is taking place also to prevent dc voltage value V under the overload situation
DcReduce rapidly, can carry out the adjustment of reactive power simultaneously, can reduce the capacity of pwm converter in addition.
The present invention also aims to obtain and more stably to carry out power converter, can prevent that higher harmonic current that rectifier produces from flowing back to the power-converting device of AC power.
Power-converting device of the present invention has the control assembly of controlling pwm converter according to the difference of dc voltage value that is applied on the filtering capacitor and assigned voltage value, and the VD value of rectifier is configured to equal the assigned voltage value.
This power-converting device is set at the assigned voltage value with the VD value of rectifier, by this, does not take place at pwm converter under the normal condition of overload, relies on rectifier to carry out power running.
The power-converting device of another kind of form of the present invention is to be worth with consistent command value according to must send as an envoy to dc voltage value and assigned voltage of the numerical value of added direct voltage on the filtering capacitor and the deviation of assigned voltage value, simultaneously, according to this command value and the Deviation Control pwm converter that flows through the current value of rectifier.
This power-converting device is obtained with the deviation of assigned voltage value from the dc voltage value on the filtering capacitor and is made their consistent command value, and according to the Deviation Control pwm converter of current value in this command value and the rectifier, at dc voltage value because of load variations etc. under former thereby situation change significantly, the capacity of the restriction power converter that pwm converter carried out.
Another kind of power-converting device of the present invention is according to the deviation setting upper limit value and lower limit value of the current value in the rectifier to current value in command value and the rectifier.
This power-converting device is according to its upper limit value and lower limit value of deviation setting to current value in command value and the rectifier of the current value in the rectifier, thereby at dc voltage value because of load variations etc. in the former thereby change, the capacity of the restriction power converter that pwm converter carried out.
Another kind of power-converting device of the present invention is that the change of assigned voltage value and rectifier primary side alternating voltage is changed pro rata.
This power-converting device changes the change of assigned voltage value and rectifier primary side alternating voltage pro rata, thereby, even the alternating voltage of pwm converter 5 primary sides changes, also can carry out stable power converter.
Another kind of power-converting device of the present invention is to make the inversely proportional variation of current value in assigned voltage value and the rectifier.
This power-converting device makes the inversely proportional variation of current value in assigned voltage value and the rectifier, thereby, even the current value change in the rectifier also can carry out stable power converter.
Another kind of power-converting device of the present invention is that the primary side at pwm converter and rectifier is provided with transformer.
This power-converting device is provided with transformer by the primary side at pwm converter and rectifier, and the higher harmonic current that rectifier is produced can not flow back to AC power.
Another kind of power-converting device of the present invention is provided with one of interchange choke and transformer at least in the primary side of pwm converter.
This power-converting device is provided with any that exchanges choke or transformer at least in the primary side of pwm converter 5, thereby is limited in the current changing rate when controlling pwm converter, and reduces higher harmonic current.
Another power-converting device of the present invention is that pwm converter is associated with the active filter of contained higher harmonic current in the minimizing circulating current.
This power-converting device reduces the higher harmonic current that contains in the circulating current by this.
Another kind of power-converting device of the present invention is to constitute rectifier with diode element.
This power-converting device constitutes rectifier with diode element, but does not take place at pwm converter under the normal condition of overload, still relies on rectifier to carry out power running.
Another kind of power-converting device of the present invention is to constitute rectifier with silicon controlled rectifier.
This power-converting device constitutes rectifier with silicon controlled rectifier, but does not take place at pwm converter under the normal condition of overload, still relies on rectifier to carry out power running.
Another kind of power-converting device of the present invention is to constitute rectifier with grid-control turn off thyristor rectifier cell.
This power-converting device constitutes rectifier with grid-control turn off thyristor rectifier cell, therefore, utilizes rectifier also can control reactive power.
Another kind of power-converting device of the present invention is to constitute the direct current choke with superconducting coil.
This power-converting device constitutes the direct current choke with superconducting coil, but when pwm converter does not have overload normal, still utilizes rectifier to carry out power running.
Another kind of power-converting device of the present invention is to be configured to pwm converter and rectifier heterogeneous.
This power-converting device reduces higher harmonic current contained in the circulating current by this.
Another kind of power-converting device of the present invention is configured to, control assembly with the assigned voltage value deduct with rectifier in the proportional numerical value of electric current so that the assigned voltage value changes.
This power-converting device thereby also can carry out stable power converter when current values changes in rectifier.
Fig. 1 is the power-converting device structure chart of the present invention the 1st embodiment.
Fig. 2 shows pwm converter 5 operation principle polar plots.
Fig. 3 is the oscillogram of the operation principle of explanation PWM controller 35.
Fig. 4 is the power-converting device structure chart of the present invention the 2nd embodiment.
Fig. 5 is the power-converting device structure chart of the present invention the 3rd embodiment.
Fig. 6 is the structure chart of reference voltage setting apparatus 27.
Fig. 7 is the structure chart of assigned voltage value setting section in the power-converting device of the present invention the 4th embodiment.
Fig. 8 is the structure chart of assigned voltage value setting section in the power-converting device of the present invention the 5th embodiment.
Fig. 9 is that the demonstration rectifier DC is exported electric V
DdAnd the graph of a relation that concerns between the circulating current Idd.
Figure 10 is the power-converting device structure chart of the present invention the 7th embodiment.
Figure 11 is the structure chart of rectifier in the power-converting device of the present invention the 8th embodiment.
Figure 12 is the structure chart of rectifier in the power-converting device of another embodiment of the present invention.
Figure 13 is the structure chart of rectifier in the power-converting device of the present invention the 9th embodiment.
Figure 14 is the structure chart of rectifier in the power-converting device of another embodiment of the present invention.
Figure 15 is the control structure schematic diagram when constituting power-converting device with silicon controlled rectifier 59.
Figure 16 is the oscillogram that is used to illustrate silicon controlled rectifier action principle shown in Figure 15.
Figure 17 is the structure chart of rectifier in the power-converting device of the present invention the 10th embodiment.
Figure 18 is the structure chart of rectifier in the power-converting device of other embodiment of the present invention.
Figure 19 is the structure chart of power-converting device always.
Figure 20 is the structure chart of power-converting device always.
Figure 21 is the structure chart of power-converting device always.
Fig. 1 is the power-converting device structure chart of the present invention the 1st embodiment.Among the figure, the 21st, be connected in the transformer of transformer 2 and rectifier 6 primary sides; The 22nd, control assembly, at pwm converter 5 or rectifier 6 when DC load 9 is supplied with direct current powers, according to the numerical value V that adds direct voltage on the filtering capacitor 8
DcWith assigned voltage value V
Dc *Deviation control pwm converter 5, thereby make the numerical value V of direct voltage
DcWith assigned voltage value V
Dc *Obtain due unanimity.
The 23rd, be used to detect the voltage detector of the alternating voltage VS1 of transformer 2 primary side, the 24th, in order to obtain the phase-locked loop circuit (PLL circuit hereinafter referred to as) that detects alternating voltage VS1 phase place with the synchronous of alternating voltage VS1, the 25th, the current detection circuit of the alternating current IC (Iu, Iv, Iw) of detection input pwm converter 5,26 is 3 phases/2 phasing commutators, and current detection circuit 25 detected alternating current IC (Iu, Iv, Iw) are transformed into electric current I with PLL circuit 24 detected phase theta homophases
qAnd the electric current I of 90 ° of phase differences is arranged with phase theta
d
The 27th, set assigned voltage value V
Dc *The reference voltage setting apparatus, the 28th, the assigned voltage value V that reference voltage setting apparatus 27 is set
Dc *Deduct and add dc voltage value V on the filtering capacitor 8
DcSubtracter, the 29th, output current command value I
q *, so that the result that subtracts each other of subtracter 28 reaches zero voltage controller, the 30th, with the current instruction value I of voltage controller 29 outputs
q *Deduct the electric current I that 3 phases/26 conversion of 2 phasing commutators go out
qSubtracter, the 31st, output voltage command value V
q *(with the voltage of transformer secondary side voltage homophase) is so that the current controller that subtracts each other vanishing as a result of subtracter 30.
The 32nd, set the current instruction value I that 90 ° of phase differences are arranged with the secondary-side voltage of transformer 2
d *The reference current setting apparatus, the 33rd, with the current instruction value I of reference current setting apparatus 32 output
d *Deduct the subtracter of electric current I d, the 34th, output makes the result that subtracts each other of subtracter 33 reach zero voltage instruction value V
d *The current controller of (90 ° of phase differences being arranged) with the secondary-side voltage of transformer 2, the 35th, according to the voltage instruction value V of PLL circuit 24 detected phase theta and current controller 31,34 outputs
q *, V
d *Produce the PWM controller of the pwm pulse signal of supplying with pwm converter 5, the 36th, amplify the pwm pulse signal that pwm converter 35 produces, make the self-quenching element unlatching that constitutes pwm converter 5, the gate amplifier of closing.In addition, direct current choke 7 is made of superconducting coil.
Below operation principle is described.
In power-converting device in the past, the VD value Vdd of rectifier 6 sets for and is lower than assigned voltage value V
Dc *But in the present invention, the VD value Vdd of rectifier 6 is set at assigned voltage value V
Dc *
Thereby in device in the past, as mentioned above, overload takes place in pwm converter 5, causes dc voltage value V
DcReduce, but as not being reduced to the VD value Vdd that is lower than rectifier 6, then rectifier 6 is can not begin power running.But in the present invention, because the VD value Vdd of rectifier 6 is set at assigned voltage value V
Dc *So in the normal condition of pwm converter 5 no overloads, rectifier 6 also is a positive bias.Thereby in the normal condition of pwm converter 5 no overloads, rectifier 6 also carries out power running.
In other words, rectifier 6 of the present invention always is in the positive bias state except that electric power regeneration situation, thereby the running that always is used as power usually.
On the other hand, added dc voltage value V on filtering capacitor 8
DcChange, and with assigned voltage value V
Dc *Under the corresponding to normal condition, pwm converter 5 running that is not used as power, and only at V
DcChange is from assigned voltage value V
Dc *Situation under the running that just is used as power, but the control of reactive power is then irrelevant with the change of load.
The following describes the operation principle of control assembly 22 and pwm converter 5.PLL circuit 24 detects the phase theta of alternating voltage VS1.3 phases/2 phasing commutators 26 are transformed into electric current with PLL circuit 24 detected phase theta homophases with current detection circuit 25 detected alternating current IC (Iu, Iv, Iw)
qWith the electric current I that 90 ° of phase differences are arranged
d
The conversion equation is as follows.As seen from Figure 2, electric current I
qBe the electric current composition that produces active power, electric current I
dIt is the electric current composition that produces reactive power.
Control assembly 22 control pwm converters 5, its purpose is to work as the value V of the direct voltage that applies on the filtering capacitor 8
DcChange is from assigned voltage value V
Dc *The time, the direct current power suitable with this change value will be obtained by pwm converter 5.As dc voltage value V
DcWith assigned voltage value V
Dc *When consistent, because deviation is zero, the running so pwm converter 5 is not used as power.
Control assembly 22 control pwm converters 5 make it provide and reference current setting apparatus 27 predefined current setting value I to DC load 9
d *Corresponding to reactive power.That is subtracter 33 is with current instruction value I
d *Deduct the electric current I d after 3 phases/2 phase inversion.Current controller 34 outputs make the voltage instruction value V that calculates vanishing as a result that subtracts of subtracter 33
d *
The voltage instruction value V that pwm converter 35 is exported according to PLL circuit 24 detected phase theta and current controller 31,34
q *, V
d *, produce pwm pulse signal and give pwm converter 5.Particularly, by with equation (1) to voltage instruction value V
q *, V
d *Make inverter, to obtain the phase voltage command value V of 3 phases
*(Vu
*, Vv
*, Vw
*).And then as shown in Figure 3, with phase voltage command value V
*Compare with triangular carrier, produce pwm pulse signal.
Gate amplifier 36 amplifies pwm pulse signal.The self-quenching element that constitutes pwm converter 5 is controlled its conducting or shutoff by pwm pulse signal.
As mentioned above, according to the operation principle of this device, rectifier 6 carries out power running all the time.Pwm converter 5 only is in the value V that overload makes added direct voltage on the filtering capacitor 8 at rectifier 6 because of load change
DcCarry out power running under the situation of change.In a word, pwm converter 5 is only supplied electric power transiently for the overload of eliminating power-converting device.Thereby even when power-converting device is in overload, pwm converter 5 also has the outer electric power of surplus energy amount supplied.That is even power-converting device is under the overload, pwm converter 5 is extra output current still, thereby also can control reactive power under the situation of overload.
In the occasion of always power-converting device, after pwm converter 5 enters overload, the numerical value V of added direct voltage on the filtering capacitor 8
DcBe reduced to the VD value V that is lower than rectifier 6
DdThe time, rectifier 6 just begins power running.And under occasion of the present invention, in case rectifier 6 enters overload, the value V of added direct voltage on the filtering capacitor 8
DcDuring change, pwm converter 5 begins power running immediately.Thereby it is such can not go out phenomenon device always, when overload takes place when, and dc voltage value V
DcThe phenomenon that can sharply drop suddenly.
In addition, under occasion of the present invention, the rectifier 6 that capacity can increase simply carries out power running all the time.As long as pwm converter 5 can be dealt with the overload of rectifier 6.Thereby comparable in the past pwm converter 5 minimizing capacity.
Because in the present invention, rectifier 6 carries out power running all the time, so as shown in Figure 1, between pwm converter 5, rectifier 6 and the direct current choke 7 circulating current I is always arranged
DdFlow through.Circulating current I
DdIn also may have higher harmonic current.But, owing to be connected to transformer 21 in the primary side of pwm converter 5 and rectifier 6, even thereby circulating current I
DdIn contain higher harmonic current, also can stop higher harmonic current to flow back to AC power 1.
Fig. 4 is the power-converting device structure chart that is adopted among the present invention the 2nd embodiment.Among the figure, the 41st, control assembly is according to the numerical value V of added direct voltage on the filtering capacitor 8
DcWith assigned voltage value V
Dc *Deviation obtain the current instruction value I that can make both unanimities
q *, and according to this current instruction value I
q *Deviation Control pwm converter 5 with the circulating current Idd that flows through in the rectifier 6.The 42nd, the current detector of circulating current Idd in the detection rectifier 6, the 43rd, with the circulating current V that exchanges
DdBe transformed into the diode rectifier of direct current, the 44th, with the current instruction value I of voltage controller 29 outputs
q *Deduct circulating current I
DdThe subtracter of numerical value, the 45th, upper and lower amplitude limit device.
Below its operation principle is described.
In the 1st embodiment, as dc voltage value V
DcWhen changing because of reasons such as load variations, pwm converter 5 begins power running immediately, to suppress this change.In the present embodiment, as dc voltage value V
DcFormer thereby when changing because of load change etc., rectifier 6 suppresses load change as far as possible by oneself.Thereby the power converter capacity that is produced by the power running of pwm converter 5 can be controlled in the Min..
In the 1st embodiment, voltage controller 29 is directly to subtracter 30 output current command value I
q *But in this example, subtracter 44 is from current instruction value I
q *Deduct the circulating current I that is transformed into direct current by diode rectifier 43
DdAfter, will subtract the calculation result again and export to subtracter 30.And because upper and lower amplitude limit device 45 has been set higher limit and lower limit, so when subtracter 44 subtract the calculation result when exceeding higher limit or lower limit, its higher limit or lower limit are output to subtracter 30.
Like this, current instruction value I
q *Deduct circulating current I
Dd, thereby, that part of electric power that 5 of pwm converters provide 6 in rectifier not supply with.
Fig. 5 is the power-converting device structure chart that is adopted among the present invention the 3rd embodiment.Among the figure, the 46th, control assembly can be according to circulating current I in the rectifier 6
DdValue, set current instruction value I
q *And circulating current I
DdThe upper limit value and lower limit value of deviation, the 47th, the variable upper and lower amplitude limit device that upper limit value and lower limit value can be set from the outside, the 48th, set the higher limit generation circuit of the higher limit of variable upper and lower amplitude limit device 47.Higher limit generation circuit 48 sets the higher limit of variable upper and lower amplitude limit device 47 as circulating current I for
DdThe output of variable upper and lower amplitude limit device 47 is near zero (but be on the occasion of) in the time of under setting.The 49th, lower limit generation circuit is as direct voltage V
DcRise, thus the beginning regeneration operating, circulating current I
DdReduce and when reducing under the setting, the amplitude limit value of variable upper and lower amplitude limit device 47 is drawn back to minus side.
Below its operation principle is described.
In the 1st embodiment and the 2nd embodiment, as circulating current I
DdWhen almost not having, to current controller 31 outputs and current instruction value I
q *The basic value that equates.Thereby, be used to eliminate direct voltage V
DcThe electric power of change is supplied with by pwm converter 5 substantially.In this example, as circulating current I
DdLess than setting, that is when almost not having, higher limit generation circuit 48 is set the higher limit of variable upper and lower amplitude limit device 47 for the output that makes variable upper and lower amplitude limit device 47 go to zero (but on the occasion of).Higher limit generation circuit 48 continues variable upper and lower amplitude limit device 47 is controlled, until circulating current I
DdTill reaching on the setting.Thereby pwm converter 5 substantially not supply capability and, carry out supply of electric power by rectifier 6.
Like this, the 3rd embodiment compare in the 2nd embodiment, the running ratio of pwm converter 5 is littler.Thereby can further reduce the capacity of pwm converter 5.
As shown in Figure 6, among the 3rd embodiment, reference voltage setting apparatus 27 is made of fixed setting apparatus 50.Thereby, even the alternating voltage VS change of rectifier 6 primary sides, assigned voltage value V
Dc *Also always certain.But, as shown in Figure 7, also can make assigned voltage value V
Dc *With the change of the alternating voltage VS of rectifier 6 primary sides and change proportionally.
Among Fig. 7, the 51st, the voltage detector of detection alternating voltage VS, the 52nd, make assigned voltage value V
Dc *With the change of the alternating voltage VS of rectifier 6 primary sides and the reference voltage setting apparatus that changes proportionally, the 53rd, amplifier, the 54th, alternating voltage VS is deducted the subtracter of the output of amplifier 53, the 55th, with assigned voltage value V
Dc *Adder with the output addition of subtracter 54.
Below operation principle is described.
Alternating voltage VS (the VS value is the line voltage effective value) and rectifier 6 VD V
DdBetween have a following relation:
V
dd＝1.35×VS (2)
At the normal condition that phenomenons such as load change do not take place, VD V
Dd, institute adds direct voltage V on the filtering capacitor 8
DcAnd assigned voltage value V
Dc *Between have a following relation:
V
dc *＝V
dc＝V
dd (3)
Thereby, if alternating voltage VS is constant, then according to formula (2), the VD V of rectifier 6
DdKeep certain, therefore, the device of the various embodiments described above constitutes stable control system.But, if alternating voltage VS change, then according to formula (2), VD V
DdAlso will change, formula (3) therefore becomes untenable.This is because the assigned voltage value V of fixed setting apparatus 50 outputs
Dc *Be certain, thereby should value and VD V
DdBecome inconsistent.As a result, assigned voltage value V
Dc *Become unsuitable value in control system, it is unstable that control system will become.
For this reason, in the present embodiment, taked to make assigned voltage value V
Dc *The control mode that changes pro rata with the change of alternating voltage VS.Particularly, at first, subtracter 54 deducts (the assigned voltage value V of fixed setting apparatus 50 from alternating voltage VS
Dc *Multiply by regulation gain and) output of amplifier 53, to detect the variable quantity of alternating voltage VS.The gain of amplifier 53 initially is adjusted into the normal condition that does not change at alternating voltage VS, makes subtracter 54 be output as zero.Adder 55 is with the assigned voltage value V of fixed setting apparatus 50 outputs
Dc *Add the output of subtracter 54.Thereby the output of adder 55 finally becomes the assigned voltage value V that gives subtracter 28
Dc *
So just, obtained to form the assigned voltage value V of rate variable with the change of alternating voltage VS
Dc *Thereby, control system is stablized.
Fig. 8 is the structure chart of assigned voltage value setting section in the power-converting device that adopted of the present invention the 5th embodiment.Wherein, the 56th, with circulating current I
DdThe multiplier of multiplication by constants K, the 57th, the output of reference voltage setting apparatus 52 is deducted the subtracter of the output of multiplier 56.
Its operation principle below is described.
On filtering capacitor 8, add direct voltage V
DcFormer thereby when changing because of load change etc., direct voltage V
DcVD V with rectifier 6
DdBetween produce deviation voltage.Circulating current I
DdTherefore change.Circulating current I
DdRate of change can be expressed as follows:
di/dt＝(V
dd－V
dc)/L2 (4)
The VD V of rectifier 6
DdMean value and circulating current I
DdRelation represent with figure line, then as Fig. 9.
The V of VD shown in Fig. 9
DdWith circulating current I
DdThe state that reduces of increase inversely proportionally.This is owing to be subjected in the rectifier 6 due to the rectification overlaying influence.
Thereby, if take VD V into account
DdWith circulating current I
DdRelation, and do not make assigned voltage V
Dc *Change, being false in then actual following formula (2), (3), just can not get stable control system.
For this reason, in the present embodiment, subtracter 57 deducts the output of reference voltage setting apparatus 52 (input circulating current I
DdAnd multiplication by constants K) output of multiplier 56.Then, the output of subtracter 57 becomes assigned voltage value V
Dc *, give subtracter 28.
Like this, just, can obtain the control system more more stable than previous embodiment.
In the various embodiments described above, though, also can only connect transformer 2 as a rule just transformer 2 and exchange the way that choke 4 is connected in the primary side of pwm converter 5 and be illustrated.Though this is owing to exchange the element that choke 4 is restriction current changing rates, also can utilize the leakage inductance of transformer 2 to limit the rate of change of electric current.
Figure 10 is the power-converting device structure chart that the present invention the 7th embodiment is adopted.Wherein, the 58th, active filter, it is in parallel with pwm converter 5, to reduce circulating current I
DdIn contained higher harmonic current.
As mentioned above, served as load duration curve when longer, rectifier 6 will produce higher harmonic current.But,, then can produce the electric current anti-phase, thereby can offset higher harmonic current with higher harmonic current if be connected with source filter 58 as shown in Figure 10.
Figure 11 shows that the structure chart that adopts after diode element 6a substitutes rectifier 6 in the various embodiments described above, adopt this structure still can carry out the action identical with the various embodiments described above.
For another shown in Figure 12, rectifier 6 heterogeneousization so also can be able to be reduced circulating current I
DdContained higher harmonic current.
Figure 13 shows that the rectifier 6 that silicon controlled rectifier 59 that employing is made of silicon controlled rectifier 60 substitutes in the various embodiments described above, so also can obtain the effect identical with the various embodiments described above.In addition as shown in figure 14, silicon controlled rectifier 59 heterogeneousization so also can be able to be reduced circulating current I
DdIn the higher harmonic current that contains.
Controlling organization when Figure 15 shows that with silicon controlled rectifier 59 formation power-converting devices.Among the figure, the 61st, the phase place of alternating voltage VS is shifted to an earlier date the phase shifter of pi/2, the 62nd, set silicon controlled rectifier 59 VD V
DdFiducial value V
Dd *Setting apparatus, the 63rd, benchmark value V
Dd *Output with phase shifter 61, thereby obtain the comparator of phase control angle α, the 64th, export the gate logic that width is 120 ° a door triggering signal according to the phase control angle α of comparator 63 outputs, the 65th, the output of amplifying gate logic 64, thereby the gate amplifier of the silicon controlled rectifier 60 of triggering silicon controlled rectifier 59.
The following describes its operation principle.
Phase shifter 61 makes the phase place of alternating voltage VS shift to an earlier date pi/2.And then, comparator 63 benchmark value V
Dd *With the output of phase shifter 61, to obtain phase control angle α.Gate logic 64 is according to phase control angle α, and the output width is 120 ° a door triggering signal, with the gating timing of the silicon controlled rectifier 60 in the control silicon controlled rectifier 59.The output that gate amplifier 65 amplifies gate logic 64 is to trigger the silicon controlled rectifier 60 of silicon controlled rectifier 59.
At this, the VD V of alternating voltage VS, silicon controlled rectifier 59
DdReach and have following relation between the phase control angle α:
V
dd＝1.35×VS×cosα (5)
V
dd＝1.35×VS×V
dd */V
dd0 (6)
Wherein, V
DdThe 0th, the peak value of sine wave shown in Fig. 16 (b).
Figure 17 represents, adopts the grid-control turn off thyristor rectifier 66 that is made of grid-control turn off thyristor rectifier cell 68, also can replace the rectifier 6 of the various embodiments described above.Utilize this structure also can obtain the effect identical with the various embodiments described above.In addition, grid-control turn off thyristor rectifier 66 self also can carry out the control of reactive power.
Among the 9th embodiment, because the rectification of silicon controlled rectifier 60, phase control angle α is just (α＞0).That is realize sluggish phase control.In the occasion that adopts grid-control turn off thyristor rectifier cell 68, because its quencher voluntarily, thereby phase control angle α can be negative (α＜0).Also can implement leading phase control.So grid-control turn off thyristor rectifier 66 self also can be controlled reactive power.
In addition as shown in figure 18, grid-control turn off thyristor rectifier 66 heterogeneousization so also can be able to be reduced circulating current I
DdIn the higher harmonic current that contains.
As mentioned above, power-converting device is set the VD value of rectifier for and is equaled the assigned voltage value, thereby, not being in normal condition under the overload at pwm converter, rectifier carries out power running.The numerical value of added direct voltage change in a single day on the filtering capacitor, then pwm converter begins power running immediately, therefore, even rectifier enters overload, can prevent that also direct voltage from sharply descending.In addition, pwm converter 5 only when change has taken place direct voltage, just carries out power running transiently, is therefore reduced the capacity of pwm converter.In addition for a change, when the direct voltage change, pwm converter also can supplying electric current, even thereby overload takes place, also can control reactive power.
This power-converting device makes both consistent command value if be configured to obtain with the deviation of assigned voltage value according to the value of added direct voltage on the filtering capacitor, simultaneously control pwm converter according to the deviation of current value in this command value and the rectifier, then at this moment 5 of pwm converters provide rectifier that part of electric power that can not supply with.Thereby can reduce the capacity of pwm converter.
This power-converting device is if be configured to come according to the current value in the rectifier upper limit value and lower limit value of the deviation between the current value in setting command value and the rectifier, and then at this moment the running rate of pwm converter will further reduce.Therefore can reduce the capacity of pwm converter more.
This power-converting device is if be configured to make the assigned voltage value to change pro rata with the change of the alternating voltage of pwm converter primary side, though then at this moment alternating voltage change and also can carry out stable power converter.
This power-converting device is if be configured to make the assigned voltage value to change with current value in the rectifier inversely proportionally, though then at this moment in the rectifier value of electric current change, also can carry out stable power converter.
This power-converting device is provided with transformer if structure is formed in the primary side of pwm converter and rectifier, can prevent at this moment that then the higher harmonic current that rectifier produces from flowing back to AC power.
This power-converting device is provided with any that exchanges in choke or the transformer at least if structure is formed in the primary side of pwm converter, then at this moment, can limit the rate of change of electric current in the control pwm converter, can reduce higher harmonic current simultaneously.
At this moment this power-converting device then can offset the higher harmonic current that contains in the circulating current if be configured to reduce in the parallel connection active filter of contained higher harmonic current in the circulating current on pwm converter.Thereby can reduce higher harmonic current.
Even this power-converting device is configured to have the rectifier of being made by diode element, do not have at pwm converter under the normal condition of overload, rectifier also carries out power running.
Even this power-converting device is configured to have the rectifier that is made of silicon controlled rectifier, there is not under the normal condition of overload the rectifier running that yet is used as power at pwm converter.
This power-converting device is if be configured to have the rectifier that is made of grid-control turn off thyristor rectifier cell, then at this moment relies on the rectifier also can control reactive power.
Even this power-converting device is configured to have the direct current choke that is made of superconducting coil, there is not under the normal condition of overload the rectifier running that still is used as power at pwm converter.
Under the situation of pwm converter and heterogeneousization of rectifier, can reduce higher harmonic current contained in the circulating current.
This power-converting device if be configured to the assigned voltage value deduct with rectifier in the proportional numerical value of electric current, thereby the assigned voltage value is changed, even the current value then in the rectifier changes, still can carry out stable power converter.
Claims (14)
1. power-converting device comprises:
Pwm converter, it connects AC power, and the alternating electromotive force that this AC power is provided is transformed into direct current power, supplies with DC load, and the direct current power with DC load regeneration is transformed into alternating electromotive force simultaneously, feeds back to AC power;
Rectifier, in parallel with the said PWM converter by the direct current choke that is connected in the direct current outlet side, the alternating electromotive force that above-mentioned AC power is provided is transformed into direct current power, supplies with above-mentioned DC load;
Be connected the filtering capacitor between the dc output end of said PWM converter,
It is characterized in that, also comprise:
Control assembly, when said PWM converter or rectifier are transformed into alternating electromotive force direct current power and supply with above-mentioned DC load, according to the numerical value of added direct voltage on the above-mentioned filtering capacitor and the Deviation Control said PWM converter of assigned voltage value, so that this dc voltage value is consistent with the assigned voltage value
The VD value of above-mentioned rectifier is set for and is equaled the afore mentioned rules magnitude of voltage.
2. power-converting device as claimed in claim 1, it is characterized in that, above-mentioned control assembly is when control said PWM converter, obtain with the deviation of afore mentioned rules magnitude of voltage according to the value that adds direct voltage on the above-mentioned filtering capacitor and to make this dc voltage value and the consistent command value of assigned voltage value, and according to the Deviation Control said PWM converter of current value in this command value and the above-mentioned rectifier.
3. power-converting device as claimed in claim 2 is characterized in that, above-mentioned control assembly is set the upper limit value and lower limit value of the deviation of current value in above-mentioned command value and the above-mentioned rectifier according to the current value of above-mentioned rectifier.
4. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that above-mentioned control assembly makes the afore mentioned rules magnitude of voltage change pro rata with the change of the alternating voltage of above-mentioned rectifier primary side.
5. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that above-mentioned control assembly makes the afore mentioned rules magnitude of voltage change with current value in the above-mentioned whole device inversely proportionally.
6. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that, primary side at said PWM converter and rectifier is provided with transformer, flows back to above-mentioned AC power to prevent the circulating current in said PWM converter, above-mentioned rectifier and the above-mentioned direct current choke.
7. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that, be provided with any device that exchanges in choke and the transformer at least in the primary side of said PWM converter.
8. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that the active filter and the said PWM converter that are used for reducing the higher harmonic current that said PWM converter, above-mentioned rectifier and above-mentioned direct current choke circulating current contained are in parallel.
9. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that above-mentioned rectifier is made of diode element.
10. as arbitrary described power-converting device in the claim 1 to 3, it is characterized in that above-mentioned rectifier is made of silicon controlled rectifier.
11., it is characterized in that above-mentioned rectifier is made of grid-control turn off thyristor rectifier cell as arbitrary described power-converting device in the claim 1 to 3.
12. power-converting device as claimed in claim 1 is characterized in that, above-mentioned direct current choke is made of superconducting coil.
13., it is characterized in that said PWM converter and rectifier are designed to heterogeneousization as arbitrary described power-converting device in the claim 1 to 3.
14. power-converting device as claimed in claim 1 is characterized in that, above-mentioned control assembly with the afore mentioned rules magnitude of voltage deduct with rectifier in the proportional numerical value of electric current, thereby this assigned voltage value is changed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20345493A JP3272495B2 (en) | 1993-08-17 | 1993-08-17 | Power converter |
| JP203454/93 | 1993-08-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1099199A CN1099199A (en) | 1995-02-22 |
| CN1033941C true CN1033941C (en) | 1997-01-29 |
Family
ID=16474393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94103159 Expired - Fee Related CN1033941C (en) | 1993-08-17 | 1994-03-15 | Power shifting apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3272495B2 (en) |
| CN (1) | CN1033941C (en) |
| DE (1) | DE4428907B4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904873A (en) * | 2014-03-06 | 2014-07-02 | 哈尔滨工程大学 | Three-phase voltage type PWM rectifier starting current surge suppression method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2361367B (en) * | 2000-04-13 | 2004-06-30 | Alstom | A control system adapted to control operation of an AC/DC converter |
| JP5063379B2 (en) * | 2008-01-11 | 2012-10-31 | 日立アプライアンス株式会社 | POWER CONVERTER, POWER CONVERTER MODULE, AIR CONDITIONER AND REFRIGERATOR |
| FR3033458B1 (en) * | 2015-03-05 | 2018-06-15 | Moteurs Leroy-Somer | ELECTROMECHANICAL ASSEMBLY COMPRISING AN ALTERNATOR |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970185A (en) * | 1982-10-14 | 1984-04-20 | Toshiba Corp | Power converter |
| JPS6166569A (en) * | 1984-09-05 | 1986-04-05 | Toshiba Corp | Power converter |
| JPS6166573A (en) * | 1984-09-06 | 1986-04-05 | Toshiba Corp | Power converter |
| DE3935868A1 (en) * | 1988-11-09 | 1990-05-10 | Asea Brown Boveri | Rectifier for power supply control - has pulsed inverter reverse coupled to control operating point |
| DE4232829C2 (en) * | 1992-09-30 | 1996-12-19 | Siemens Nixdorf Inf Syst | Circuit arrangement for generating a DC voltage |
-
1993
- 1993-08-17 JP JP20345493A patent/JP3272495B2/en not_active Expired - Fee Related
-
1994
- 1994-03-15 CN CN 94103159 patent/CN1033941C/en not_active Expired - Fee Related
- 1994-08-16 DE DE19944428907 patent/DE4428907B4/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904873A (en) * | 2014-03-06 | 2014-07-02 | 哈尔滨工程大学 | Three-phase voltage type PWM rectifier starting current surge suppression method |
| CN103904873B (en) * | 2014-03-06 | 2016-08-24 | 哈尔滨工程大学 | A kind of Three-phase PWM Voltage Rectifier starting current impact suppressing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3272495B2 (en) | 2002-04-08 |
| CN1099199A (en) | 1995-02-22 |
| DE4428907A1 (en) | 1995-02-23 |
| DE4428907B4 (en) | 2005-03-17 |
| JPH0759352A (en) | 1995-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1044304C (en) | Improved power converter device for direct current power supply to an electric arc furnace | |
| Lo et al. | A high-efficiency AC-to-DC adaptor with a low standby power consumption | |
| CN1992500A (en) | Power converting apparatus | |
| CN1042315C (en) | Device for controlling speed of elevator | |
| JP5575235B2 (en) | Power converter | |
| US20170063251A1 (en) | AC/DC Converters | |
| Sayed et al. | Soft-switching PWM technique for grid-tie isolated bidirectional DC–AC converter with SiC device | |
| CN1272897C (en) | Switch power source device | |
| Chuang et al. | Analysis and implementation of half-bridge series–parallel resonant converter for battery chargers | |
| CN101060285A (en) | A system and method for realizing the isolation of high frequency switch DC-DC conversion | |
| CN1906837A (en) | DC-DC converter | |
| EP2985897B1 (en) | Power conversion device | |
| US9197126B2 (en) | Power converting apparatus | |
| CN1722591A (en) | Apparatus and method for fixed-frequency control in a switching power supply | |
| CN1574582A (en) | Soft switch power converter | |
| Heydari-Doostabad et al. | Pseudo dc-link EV home charger with a high semiconductor device utilization factor | |
| CN1311621C (en) | Frequency changer controller for driving motor and air-conditioner | |
| CN101044669A (en) | Power conversion apparatus | |
| CN1047484C (en) | Single phase input three phase full bridge rectifier circuit and sigle phase input pseudo four phase full bridge rectifier circuit | |
| CN1215625C (en) | Power fluctuation compensation device | |
| Narula et al. | Improved power-quality-based welding power supply with overcurrent handling capability | |
| EP2709260A1 (en) | Safety protection-type power supply system | |
| CN1074864C (en) | Power converter | |
| CN1033941C (en) | Power shifting apparatus | |
| CN1557044A (en) | Power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TOSHIBA MITSUBISHI ELECTRIC INDUSTRIAL SYSTEM CO. Free format text: FORMER OWNER: MITSUBISHI ELECTRIC CO., LTD. Effective date: 20041126 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20041126 Address after: Tokyo, Japan Patentee after: Toshiba Mitsubishi Electric Industrial Systems Co., Ltd. Address before: Tokyo, Japan Patentee before: Missubishi Electric Co., Ltd. |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |