CN102647098A - Traction power supply device and control method of shared transformer - Google Patents
Traction power supply device and control method of shared transformer Download PDFInfo
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- CN102647098A CN102647098A CN2012100979944A CN201210097994A CN102647098A CN 102647098 A CN102647098 A CN 102647098A CN 2012100979944 A CN2012100979944 A CN 2012100979944A CN 201210097994 A CN201210097994 A CN 201210097994A CN 102647098 A CN102647098 A CN 102647098A
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Abstract
The embodiment of the invention relates to a traction power supply device and a control method of a shared transformer. The control method includes the following steps: detecting the electromotive force of a primary winding, the alternating current of all the output terminals of two secondary windings, and the output current and the output voltage of two current converting units; obtaining two sets of driving pulses according to the set direct-current voltage, the overall reactive instruction current of the PWM (Pulse-Width Modulation) rectifiers of the two current converting units, and the detected electromotive force of the primary winding, the alternating current of all the output terminals of the two secondary windings as well as the output current and the output voltage of the two current converting units; and respectively sending the two sets of driving pulses to the driving ends of the PWM rectifiers of the two current converting units. The embodiment of the invention realizes that a diode rectifier and the PWM rectifiers share one transformer. Therefore, the cost of the equipment is lowered, the volume of the equipment is reduced and the flexibility in the actual engineering application is increased.
Description
Technical field
The present invention relates to the power supply technique field, relate in particular to a kind of traction power set and control method of common transformer.
Background technology
At present, generally to adopt 750V or 1500V direct current be rolling stock power supply in urban track traffic.What the electric substation traction power set adopted is 12 or 24 pulse wave diode rectification units, and its major advantage is that system configuration is simple, good reliability, power density is high, overload capacity is strong, equipment cost is low; Shortcoming is that its VD is uncontrollable; Scope range of the fluctuation of voltage is big, and its energy can only be from AC side to the DC side one-way transmission, and the excess energy of train regenerative braking can not the feedback AC network; Need brake resistance to consume, cause wasting of energy.
Patent ZL 200810103678.7 discloses a kind of mixed traction power supply equipment and control method, and wherein mixed traction power supply equipment is on the basis of conventional diode Rectification Power Factor, the parallel connection one the cover (Pulse Width Modulation; Be called for short PWM) Rectification Power Factor; Make full use of advantage and the two-way flow of PWM Rectification Power Factor energy of diode rectification unit, the advantage that power factor is adjustable, thereby improve the direct current network voltage stability, improve power supply quality; Realize train braking energy feedback AC side electrical network simultaneously; Avoid braking energy on resistance, to consume, conserve energy, even can also be used for centering pressure ring net and carry out reactive power compensation.
The inventor finds in the process of embodiment of the present invention; There is following defective at least in prior art: the PWM Rectification Power Factor needs the additional configuration dedicated transformer in the prior art; Its cost is higher, and the installation of transformer simultaneously need take very big space, makes practical engineering application receive certain limitation.
Summary of the invention
The traction power set and the control method that the purpose of this invention is to provide a kind of common transformer need the problem of additional configuration dedicated transformer in order to solve PWM Rectification Power Factor in the prior art.
On the one hand, the embodiment of the invention provides a kind of traction power set of common transformer, comprising:
A phase shifting transformer; Said phase shifting transformer comprises a former limit winding and two secondary windings; Said former limit winding adopts triangle to connect, and said two secondary windings adopt respectively and star-likely are connected with triangle, and each secondary winding includes specified lead-out terminal and centre tap lead-out terminal;
Two current transforming units; Each current transforming unit is corresponding with a secondary winding respectively; Each current transforming unit includes the diode rectifier and the pulse modulation PWM rectifier of output-parallel, and the AC side of the AC side of the diode rectifier in each current transforming unit and PWM rectifier is connected with the centre tap lead-out terminal with the specified lead-out terminal of corresponding secondary winding respectively;
Be used to detect the alternating current of each lead-out terminal of the electromotive force of former limit winding, two secondary windings, the output current and the output voltage of two current transforming units; According to the alternating current of each lead-out terminal of the total idle instruction current of PWM rectifier and the electromotive force of detected former limit winding, two secondary windings in the direct voltage of setting and two current transforming units, the output current and the output voltage of two current transforming units; Obtain two groups of driving pulses; And sending to the control unit of the drive end of PWM rectifier in said two current transforming units respectively, said control unit is connected with the drive end of PWM rectifier in the output of each lead-out terminal of the input terminal of said former limit winding, said two secondary windings, said two current transforming units and said two current transforming units respectively.
On the other hand, the embodiment of the invention provides a kind of control method of the traction power set based on above-mentioned common transformer, comprising:
Detect the alternating current of each lead-out terminal of the electromotive force of former limit winding, two secondary windings, the output current and the output voltage of two current transforming units;
Total idle instruction current according to PWM rectifier in the direct voltage of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units, obtain two groups of driving pulses;
Said two groups of driving pulses are sent to the drive end of two PWM rectifiers in the current transforming unit respectively.
The embodiment of the invention adopt comprise former limit winding that a triangle connects and to be respectively star-like and to be connected, phase shifting transformer and two current transforming units of two secondary windings of triangle connection; The AC side of the AC side of the diode rectifier in each current transforming unit and PWM rectifier is connected with the centre tap lead-out terminal with the specified lead-out terminal of corresponding secondary winding respectively; Control unit is according to the total idle instruction current of PWM rectifier in the direct voltage command value of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units; Controlled the technological means of the driving pulse of PWM rectifier respectively; Realize diode rectifier and the shared transformer of PWM rectifier; Reduce equipment cost, reduced volume simultaneously, increased the flexibility of practical engineering application.
Description of drawings
The structural representation of the traction power set of a kind of common transformer that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is a kind of circuit diagram of middle phase shifting transformer embodiment illustrated in fig. 1 and two current transforming units;
Fig. 3 is a kind of structural representation of middle control unit embodiment illustrated in fig. 1;
Fig. 4 is a kind of circuit diagram of the PWM rectifier in embodiment illustrated in fig. 1;
Fig. 5 is a kind of circuit diagram of middle diode rectifier embodiment illustrated in fig. 1;
Fig. 6 is a kind of circuit diagram of middle diode D1 embodiment illustrated in fig. 5;
Fig. 7 is a kind of application structure figure of control unit among Fig. 1 embodiment;
Fig. 8 is a kind of application sketch map of alternating current ring I_loopl among Fig. 7;
The schematic flow sheet of the control method of a kind of traction power set based on above-mentioned common transformer that Fig. 9 provides for the embodiment of the invention;
Figure 10 is the schematic flow sheet of a kind of concrete realization of middle step 902 embodiment illustrated in fig. 9.
Embodiment
The structural representation of the traction power set of a kind of common transformer that Fig. 1 provides for the embodiment of the invention, as shown in Figure 1, this device comprises:
Current transforming unit 12 comprises diode rectifier 121 and PWM rectifier 122, and the AC side of diode rectifier 121 is connected with the specified lead-out terminal 1121 of secondary winding 112, and PWM rectifier 122 is connected with the centre tap lead-out terminal 1122 of secondary winding 112; Current transforming unit 13 comprises diode rectifier 131 and PWM rectifier 132; The AC side of diode rectifier 131 is connected with the specified lead-out terminal 1131 of secondary winding 113; PWM rectifier 132 is connected with the centre tap lead-out terminal 1132 of secondary winding 113; The output-parallel of the output of diode rectifier 121 and PWM rectifier 122, the output of diode rectifier 131 is parallelly connected with the output of PWM rectifier 132.
Wherein, phase shifting transformer 11 can adopt poured with epoxy resin dry type three-phase transformer.The former limit winding 111 of phase shifting transformer 11 adopts triangle to connect; Two secondary windings 112,113 adopt respectively and star-likely are connected with triangle; Make the output voltage phase phasic difference 30 of secondary winding 112,113 spend; Therefore the diode rectifier in current transforming unit 12 and the current transforming unit 13 can form 12 pulse wave rectifiers, and then improves the ac current waveform of 10kv grid side, reduces to inject the mains by harmonics electric current.
Fig. 2 is a kind of circuit diagram of middle phase shifting transformer embodiment illustrated in fig. 1 and two current transforming units.As shown in Figure 2, the output parallel connection of current transforming unit 12 and current transforming unit 13, the output voltage of current transforming unit 12 and current transforming unit 13 equates, is V
DcFurther, be connected in series a DC filtering inductance L 1, L2 respectively at the cathode output end of current transforming unit 12 and current transforming unit 13, the transient potential of two current transforming unit DC sides of balance is poor, avoids the work of diode rectifier is had a negative impact.
Alternatively, can also be only be connected in series a DC filtering inductance respectively at the cathode output end of current transforming unit 12 and current transforming unit 13.Perhaps, the positive and negative electrode output at current transforming unit 12 and current transforming unit 13 is connected in series a DC filtering inductance respectively.
Alternatively, the output of current transforming unit 12 and current transforming unit 13 also can be connected, and at this moment, the output current of current transforming unit 12 and current transforming unit 13 equates.
Fig. 3 is a kind of structural representation of middle control unit embodiment illustrated in fig. 1, and as shown in Figure 3, control unit 14 specifically comprises:
Detecting unit 141; Be connected with each lead-out terminal, current transforming unit 12 and the output of current transforming unit 13 of input terminal, secondary winding 112 and the secondary winding 113 of former limit winding 111, be used to detect the output current and the output voltage of alternating current, current transforming unit 12 and current transforming unit 13 of each lead-out terminal of electromotive force, secondary winding 112 and the secondary winding 113 of former limit winding 111;
Direct current pressure ring 142; Be connected with detecting unit 141; Be used for output current and output voltage, obtain the meritorious instruction current of PWM rectifier 122 and PWM rectifier 132 according to the direct voltage of setting and detecting unit 141 detected current transforming units 12 and current transforming unit 13;
Arithmetic element 143; Be connected with detecting unit 141; Be used for the electromotive force of detecting unit 141 detected former limit windings 111 is carried out computing; The electromotive force that obtains former limit winding 111 is at the two cordic phase rotators system phase angle of the electromotive force of the component on the d axle and secondary winding 112 and secondary winding 113 down, and obtains the idle instruction current of PWM rectifier 132 in idle instruction current and the current transforming unit 13 of PWM rectifier 122 in the current transforming unit 12 according to the total idle instruction current of PWM rectifier in current transforming unit of setting 12 and the current transforming unit 13;
Alternating current ring 144 and alternating current ring 145; Corresponding one by one with secondary winding 112 with secondary winding 113, current transforming unit 12 and current transforming unit 13; Be connected with detecting unit 141, direct current pressure ring 142 and arithmetic element 143 respectively; The electromotive force that is respectively applied for the meritorious instruction current of PWM rectifier 132 in PWM rectifier 122 in the current transforming unit 12 of alternating current according to each lead-out terminal of the secondary winding 112 of detecting unit 141 detected correspondences or secondary winding 113, correspondence that direct current pressure ring 142 obtains or the current transforming unit 13, former limit winding 111 that arithmetic element 143 obtains is at the two cordic phase rotators system idle instruction current of PWM rectifier 132 in PWM rectifier 122 or the current transforming unit 13 in the current transforming unit 12 of phase angle, the correspondence of the electromotive force of the component on the d axle, corresponding secondary winding 112 or secondary winding 113 down; Obtain one group of driving pulse, send to the drive end of PWM rectifier 132 in PWM rectifier 122 in the corresponding current transforming unit 12 or the current transforming unit 13.
For instance; Alternating current ring 144 and secondary winding 112, current transforming unit 12 are corresponding; The phase angle of the idle instruction current of the component of the electromotive force that is used for the meritorious instruction current of the alternating current according to each lead-out terminal of detecting unit 141 detected secondary windings 112, PWM rectifier 122 that direct current pressure ring 142 obtains, former limit winding 111 that arithmetic element 143 obtains on d axle under the two cordic phase rotators system, PWM rectifier 122, the electromotive force of secondary winding 112; Obtain one group of driving pulse, and send to the drive end of PWM rectifier 122; Alternating current ring 145 and secondary winding 113, current transforming unit 13 are corresponding; The phase angle of the idle instruction current of the component of the electromotive force that is used for the meritorious instruction current of the alternating current according to each lead-out terminal of detecting unit 141 detected secondary windings 113, PWM rectifier 132 that direct current pressure ring 142 obtains, former limit winding 111 that arithmetic element 143 obtains on d axle under the two cordic phase rotators system, PWM rectifier 132, the electromotive force of secondary winding 113; Obtain another group driving pulse, and send to the drive end of PWM rectifier 132.
Further, detecting unit 141 specifically comprises:
Four AC current sensors; Be connected with centre tap lead-out terminal 1132 with the specified lead-out terminal 1121 of secondary winding 112 and the specified lead-out terminal 1131 of centre tap lead-out terminal 1122, secondary winding 113 respectively, be respectively applied for the alternating current that detects each lead-out terminal;
Three voltage sensors are connected with input terminal, current transforming unit 12 and the output of current transforming unit 13 of former limit winding 111 respectively, are respectively applied for the output voltage of the electromotive force, current transforming unit 12 and the current transforming unit 13 that detect former limit winding 111;
Two DC current sensors are connected with the output of current transforming unit 12 with current transforming unit 13 respectively, are used to detect the output current of current transforming unit 12 and current transforming unit 13.
Further, arithmetic element 143 specifically comprises:
Coordinate transformation unit; Be connected with alternating current ring 144,145 with detecting unit 141; Be used for the electromotive force of detecting unit 141 detected former limit windings 111 being carried out being tied to from the three phase static coordinate conversion of two cordic phase rotators system, obtain the component of electromotive force on d axle under the two cordic phase rotators system of former limit winding 111;
The phase-locked loop unit is connected with alternating current ring 144,145 with detecting unit 141, is used for the electromotive force of detecting unit 141 detected former limit windings 111 is advanced horizontal lock, obtains the phase angle of the electromotive force of secondary winding 112 and secondary winding 113.
The instruction current unit is connected with alternating current ring 144,145, is used for obtaining according to the total idle instruction current of PWM rectifier 132 in the current transforming unit of setting 12 PWM rectifiers 122 and the current transforming unit 13 the idle instruction current of PWM rectifier in each current transforming unit.
Particularly, when the output of current transforming unit 12 and current transforming unit 13 was parallel connection, the instruction current unit can carry out the meritorious instruction current that sharing control obtains each PWM rectifier to total meritorious instruction current; When the output of current transforming unit 12 and current transforming unit 13 was series connection, the instruction current unit can carry out the meritorious instruction current that Pressure and Control obtain each PWM rectifier to total meritorious instruction current.
Fig. 4 is a kind of circuit diagram of the PWM rectifier in embodiment illustrated in fig. 1.As shown in Figure 4, the PWM rectifier is by 3 ac filter capacitor C
f, 3 ac filter inductance L, 3 power device B1～B3, direct currents support capacitor C, dc fast speed fuse F form; 3 ac filter capacitor C
fAn end all be connected 3 ac filter capacitor C with centre tap lead-out terminal a1, b1, the c1 of secondary winding 112 or secondary winding 113
fThe other end connect mutually; One end of 3 ac filter inductance L is connected with centre tap lead-out terminal a1, b1, c1 respectively, and the other end of 3 ac filter inductance L is connected with the input of 3 power device B1～B3 respectively, and 3 ac filter capacitor C
fAnd the tie point of centre tap lead-out terminal a1, b1, c1 is respectively between centre tap lead-out terminal a1, b1, c1 and 3 ac filter inductance L; The output parallel connection of 3 power device B1～B3, and parallelly connected with direct current support capacitor C; Dc fast speed fuse F is series on the dc bus.
Wherein, add the ac filter capacitor C
fPurpose be to utilize ac filter inductance L, ac filter capacitor C
fAnd transformer secondary winding self leakage inductance formation filter, thereby reduce the harmonic current that the PWM rectifier injects AC network greatly.Dc fast speed fuse F is serially connected on the dc bus, is used for when direct current output is short-circuited, realizing the protection to PWM rectifier main circuit.
Further; Power device can be selected the semibridge system insulated gate bipolar transistor SPM of (Insulated Gate Bipolar Transistor is called for short IGBT) for use, and it integrates functions such as driving, protection, current measurement; Thereby simplied system structure improves equipment dependability; Direct current supports electric capacity can select thin-film capacitor for use, and the ripple current handling capacity is strong, and equiva lent impedance is little, and the life-span is long.
Fig. 5 is a kind of circuit diagram of middle diode rectifier embodiment illustrated in fig. 1, and as shown in Figure 5, diode rectifier comprises the three-phase type rectification circuit of being made up of 6 diode D1～D6.6 two diodes connect mutually in twos, and the tie point of per two diodes is connected respectively to specified lead-out terminal A1, B1, the C1 of secondary winding.
Further, for expansion capacity and the reliability that improves equipment, each diode can also comprise a plurality of diode connected in parallel and the fuse of connecting with each diode.Fig. 6 is a kind of circuit diagram of middle diode D1 embodiment illustrated in fig. 5.
The embodiment of the invention adopt comprise former limit winding that a triangle connects and to be respectively star-like and to be connected, phase shifting transformer and two current transforming units of two secondary windings of triangle connection; The AC side of the AC side of the diode rectifier in each current transforming unit and PWM rectifier is connected with the centre tap lead-out terminal with the specified lead-out terminal of corresponding secondary winding respectively; Control unit is according to the total idle instruction current of PWM rectifier in the direct voltage command value of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units; The technological means of the driving pulse of controlled PWM rectifier; Realize diode rectifier and the shared transformer of PWM rectifier; Reduce equipment cost, reduced volume simultaneously, increased the flexibility of practical engineering application.
There is multiple implementation each unit in the traction power set of the above-mentioned common transformer that the embodiment of the invention provides in application.Fig. 7 is a kind of application structure figure of control unit among Fig. 1 embodiment.Suppose the output parallel connection of two current transforming units, as shown in Figure 7, the electromotive force e of the former limit of the phase shifting transformer winding that voltage sensor senses is obtained
a, e
b, e
cObtain phase angle theta through phase-locked loop pll, suppose that the secondary winding corresponding with alternating current ring I_loop1 adopts star-like connection, reduces the phase angle theta that π/6=30 degree obtains the electromotive force of the secondary winding corresponding with I_loop1 with θ
1Suppose that the secondary winding corresponding with alternating current ring I_loop2 adopts triangle to connect, and deducts θ
Obtain the phase angle theta of the electromotive force of the secondary winding corresponding with I_loop2
2, wherein
The position of centre tap lead-out terminal of the corresponding secondary winding of size and I_loop2 relevant, spend between 30 degree 0 and to change; Electromotive force e with former limit winding
a, e
b, e
cBe tied to the Coordinate Conversion abc/dq that two cordic phase rotators are through the three phase static coordinate of associating, obtain the component E of electromotive force on d axle under the two cordic phase rotators system of former limit winding
dBecause the parallel connection of the output of two current transforming units, the output voltage of two current transforming units that voltage sensor records is v
Dc, according to the direct voltage V that sets
* DcAnd the output voltage v of two current transforming units recording of voltage sensor
Dc, obtain V
* DcDeduct v
DcVoltage difference delta v
Dc, this voltage difference process proportional integral PI computing obtains the meritorious instruction current I of total PWM rectifier
* dBecause the parallel connection of the output of two current transforming units is with I
* dObtain the meritorious instruction current I of each PWM rectifier through current-sharing unit 1/2
* d/ 2; The output current I of two current transforming units that record according to DC current sensor
Dc1And I
Dc2, with I
Dc1Deduct I
Dc2Difference between current Δ I
DcAmplify and obtain Δ I
* d, with I
* d/ 2 deduct Δ I
* dObtain the meritorious instruction current I of PWM rectifier in the current transforming unit corresponding with I_loop1
* 1d, with I
* d/ 2 add Δ I
* dObtain the meritorious instruction current I of PWM rectifier in the current transforming unit corresponding with I_loop2
* 2dAccording to the total idle instruction current I that sets
* q, obtain I
* 1q=I
* 2q=I
* q/ 2; The alternating current I of each specified lead-out terminal of the corresponding secondary winding that AC current sensor is recorded
A1, I
B1, I
C1, each centre tap lead-out terminal alternating current i
A1, i
B1, i
C1And the above-mentioned E that obtains
d, θ
1, I
* 1q, I
* 1dInput AC electric current loop I_loop1 obtains one group of control impuls g
11～g
16, the alternating current I of each specified lead-out terminal of the corresponding secondary winding that AC current sensor is recorded
A2, I
B2, I
C2, each centre tap lead-out terminal alternating current i
A2, i
B2, i
C2With the above-mentioned E that obtains
d, θ
2, I
* 2q, I
* 2dInput AC electric current loop I_loop2 obtains one group of control impuls g
21～g
26, remove to drive the PWM rectifier in the corresponding current transforming unit respectively with this two group pulse.
Fig. 8 is a kind of application sketch map of alternating current ring I_loop1 among Fig. 7.As shown in Figure 8, with the alternating current I of the specified lead-out terminal that records the corresponding secondary winding of I_loop1 of AC current sensor
A1, I
B1, I
C1Alternating current i with the centre tap lead-out terminal
A1, i
B1, i
C1, coordinate transform obtains the actual current value i of diode rectifier in the corresponding current transforming unit of I_loop1 through abc/dq
Dd, reactive current i
DqActive current value i with the reality of PWM rectifier
1d, reactive current value i
1qWith i
Dd, i
Dq, i
1d, i
1qWith the above-mentioned I that obtains
* 1q, I
* 1dAnd Ed, through a series of proportional integral computing PI, amplification Kp, plus and minus calculation, obtain the component V of electromotive force on diaxon under the two cordic phase rotators system of former limit winding respectively
* dAnd v
* q, V
* dAnd v
* qThrough space vector pulse width modulation (Space Vector Pulse Width Modulation is called for short SVPWM), obtain being used for controlling the driving pulse g of corresponding current transforming unit PWM rectifier
1～g
6
The schematic flow sheet of the control method of a kind of traction power set based on above-mentioned common transformer that Fig. 9 provides for the embodiment of the invention, as shown in Figure 9, this control method comprises:
The alternating current of each lead-out terminal of step 901, the electromotive force that detects former limit winding, two secondary windings, the output current and the output voltage of two current transforming units.
Figure 10 is the schematic flow sheet of a kind of concrete realization of middle step 902 embodiment illustrated in fig. 9, and shown in figure 10, step 902 specifically comprises:
Particularly, the direct current pressure ring obtains total meritorious instruction current according to the direct voltage of setting, the output current and the output voltage of detected two current transforming units; When the output of two current transforming units is parallelly connected, total meritorious instruction current is carried out the meritorious instruction current that sharing control obtains each PWM rectifier; When the output of two current transforming units is connected, total meritorious instruction current is carried out the meritorious instruction current that Pressure and Control obtain each PWM rectifier.
The traction power set of a kind of common transformer that the concrete realization of present embodiment provides with reference to the embodiment of the invention.The embodiment of the invention adopt comprise former limit winding that a triangle connects and to be respectively star-like and to be connected, phase shifting transformer and two current transforming units of two secondary windings of triangle connection; The AC side of the AC side of the diode rectifier in each current transforming unit and PWM rectifier is connected with the centre tap lead-out terminal with the specified lead-out terminal of corresponding secondary winding respectively; Control unit is according to the total idle instruction current of PWM rectifier in the direct voltage command value of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units; The technological means of the driving pulse of controlled PWM rectifier; Realize diode rectifier and the shared transformer of PWM rectifier; Reduce equipment cost, reduced volume simultaneously, increased the flexibility of practical engineering application.
Claims (10)
1. the traction power set of a common transformer is characterized in that, comprising:
A phase shifting transformer; Said phase shifting transformer comprises a former limit winding and two secondary windings; Said former limit winding adopts triangle to connect, and said two secondary windings adopt respectively and star-likely are connected with triangle, and each secondary winding includes specified lead-out terminal and centre tap lead-out terminal;
Two current transforming units; Each current transforming unit is corresponding with a secondary winding respectively; Each current transforming unit includes the diode rectifier and the pulse modulation PWM rectifier of output-parallel, and the AC side of the AC side of the diode rectifier in each current transforming unit and PWM rectifier is connected with the centre tap lead-out terminal with the specified lead-out terminal of corresponding secondary winding respectively;
Be used to detect the alternating current of each lead-out terminal of the electromotive force of former limit winding, two secondary windings, the output current and the output voltage of two current transforming units; According to the alternating current of each lead-out terminal of the total idle instruction current of PWM rectifier and the electromotive force of detected former limit winding, two secondary windings in the direct voltage of setting and two current transforming units, the output current and the output voltage of two current transforming units; Obtain two groups of driving pulses; And sending to the control unit of the drive end of PWM rectifier in said two current transforming units respectively, said control unit is connected with the drive end of PWM rectifier in the output of each lead-out terminal of the input terminal of said former limit winding, said two secondary windings, said two current transforming units and said two current transforming units respectively.
2. device according to claim 1 is characterized in that, the output parallel connection or the series connection of said two current transforming units, and the output of each current transforming unit all is serially connected with the DC filtering inductance.
3. device according to claim 1 is characterized in that, said control unit comprises:
Be used to detect the output current of the alternating current of each lead-out terminal of the electromotive force of said former limit winding, said two secondary windings, said two current transforming units and the detecting unit of output voltage, said detecting unit is connected with each lead-out terminal of the input terminal of said former limit winding, said two secondary windings, the output of said two current transforming units;
Be used for according to the direct voltage of setting and said detection to output current and the direct current pressure ring of the meritorious instruction current that output voltage obtains each PWM rectifier of said two current transforming units, said direct current pressure ring is connected with said detecting unit;
Be used for to said detection to the electromotive force of said former limit winding carry out electromotive force that computing obtains said former limit winding at the two cordic phase rotators system phase angle of the electromotive force of the component on the d axle and each secondary winding down; And obtaining the arithmetic element of the idle instruction current of PWM rectifier in each current transforming unit according to the total idle instruction current of PWM rectifier in two current transforming units setting, said arithmetic element is connected with said detecting unit;
Be respectively applied for according to said detection to the alternating current, corresponding current transforming unit that said direct current pressure ring obtains of each lead-out terminal of corresponding secondary winding in the PWM rectifier meritorious instruction current, former limit winding that said arithmetic element obtains electromotive force two cordic phase rotators system down in the phase angle, corresponding current transforming unit of the electromotive force of the secondary winding of the component on the d axle, correspondence the idle instruction current of PWM rectifier obtain one group of driving pulse; And send to two alternating current rings of the drive end of PWM rectifier in the corresponding current transforming unit; Said two alternating current rings and said two secondary windings, two current transforming units are corresponding one by one, are connected with arithmetic element with said detecting unit, direct current pressure ring respectively.
4. device according to claim 3 is characterized in that, said detecting unit specifically comprises:
Four AC current sensors are connected with the centre tap lead-out terminal with the specified lead-out terminal of said two secondary windings respectively;
Three voltage sensors are connected with the input terminal of said former limit winding and the output of said two current transforming units respectively;
Two DC current sensors, the output with said two current transforming units is connected respectively.
5. device according to claim 3 is characterized in that, said arithmetic element specifically comprises:
Be used for to said detection to the electromotive force of former limit winding carry out being tied to the conversion of two cordic phase rotators system from the three phase static coordinate; Obtain the coordinate transformation unit of the component of electromotive force on d axle under the two cordic phase rotators system of said former limit winding, be connected with two alternating current rings with said detecting unit;
Be used for to said detection to the electromotive force of former limit winding advance horizontal lock, obtain the phase-locked loop unit of phase angle of the electromotive force of two secondary windings, be connected with two alternating current rings with said detecting unit;
Be used for obtaining the instruction current unit of the idle instruction current of PWM rectifier in each current transforming unit, be connected with said two alternating current rings according to the total idle instruction current of two current transforming unit PWM rectifiers setting.
6. according to each described device among the claim 1-5; It is characterized in that; Said diode rectifier comprises the three-phase type rectification circuit of being made up of 6 diodes, and each diode comprises a plurality of diode connected in parallel and the fuse of connecting with each diode.
7. according to each described device among the claim 1-5, it is characterized in that said PWM rectifier comprises:
3 ac filter electric capacity, an end of said 3 ac filter electric capacity are connected with each centre tap lead-out terminal of said secondary winding respectively, and the other end of said 3 ac filter electric capacity connects mutually;
3 ac filter inductance; One end of said 3 ac filter inductance is connected with each centre tap lead-out terminal of said secondary winding respectively; The other end of said 3 ac filter inductance is connected with the input of said 3 power devices respectively, and the tie point of said 3 ac filter electric capacity and each centre tap lead-out terminal is respectively between each centre tap lead-out terminal and said 3 ac filter inductance;
3 power devices and 1 direct current support electric capacity, the output parallel connection of said 3 power devices, and parallelly connected with said direct current support electric capacity;
A dc fast speed fuse is series on the dc bus.
8. device according to claim 7, said power device are the insulated gate bipolar transistor IGBT SPM of semibridge system, and it is thin-film capacitor that said direct current supports electric capacity.
9. one kind based on the control method like the traction power set of the described common transformer of claim 1-8, it is characterized in that, comprising:
Detect the alternating current of each lead-out terminal of the electromotive force of former limit winding, two secondary windings, the output current and the output voltage of two current transforming units;
Total idle instruction current according to PWM rectifier in the direct voltage of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units, obtain two groups of driving pulses;
Said two groups of driving pulses are sent to the drive end of two PWM rectifiers in the current transforming unit respectively.
10. method according to claim 9; It is characterized in that; Said total idle instruction current according to PWM rectifier in the direct voltage of setting and two current transforming units; And the alternating current of each lead-out terminal of the electromotive force of detected former limit winding, two secondary windings, the output current and the output voltage of two current transforming units, obtain two groups of driving pulses and specifically comprise:
According to the direct voltage of said setting, the output current and the output voltage of detected two current transforming units, obtain the meritorious instruction current of each PWM rectifier;
Electromotive force to detected former limit winding carries out computing; The electromotive force that obtains said former limit winding is at the two cordic phase rotators system phase angle of the electromotive force of the component on the d axle and each secondary winding down; And, obtain the idle instruction current of each PWM rectifier according to the total idle instruction current of PWM rectifier in two current transforming units of said setting;
According to the idle instruction current of PWM rectifier in the phase angle of electromotive force electromotive force of the component on the d axle, corresponding secondary winding under two cordic phase rotators system of the meritorious instruction current of PWM rectifier in the alternating current of each lead-out terminal of corresponding secondary winding, the corresponding current transforming unit, former limit winding and the corresponding current transforming unit, obtain one group of driving pulse that is used for driving corresponding current transforming unit PWM rectifier respectively.
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