CN103078546A - Two-way switch tube-based current source type two-way multi-pulse converter - Google Patents
Two-way switch tube-based current source type two-way multi-pulse converter Download PDFInfo
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- CN103078546A CN103078546A CN2013100209741A CN201310020974A CN103078546A CN 103078546 A CN103078546 A CN 103078546A CN 2013100209741 A CN2013100209741 A CN 2013100209741A CN 201310020974 A CN201310020974 A CN 201310020974A CN 103078546 A CN103078546 A CN 103078546A
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Abstract
The invention provides a two-way switch tube-based current source type two-way multi-pulse converter which comprises a direct current side circuit (1) and a three-phase alternating current power supply (5), and also comprises a reversible three-phase bridge group (3), a multi-pulse transformer (4) and a control circuit (8), wherein the direct current side circuit (1), the reversible three-phase bridge group (3), the multi-pulse transformer (4) and the three-phase alternating current power supply (5) are sequentially connected, the single input end of the control circuit (8) is connected between the multi-pulse transformer (4) and the three-phase alternating current power supply (5), and the control end of the control circuit (8) is connected with the reversible three-phase bridge group (3). A circuit topology provided by the invention is capable of realizing energy two-way flowing of a current source type multi-pulse converter and directly controlling the current of a three-phase alternating current side, is simple in design because the controller and a filter are respectively independent, has high reliability, and is suitable for various fields needing that the multi-pulse converter realizes two-way energy transmission.
Description
Technical field
The present invention relates to a kind of current source type bidirectional multi-pulse current transformer based on the bidirectional switch pipe, belong to the category of power electronic conversion.
Background technology
The multiple-pulse inversion transformation technique adopts phase shifting transformer that the output of multi-phase inverter is superposeed, eliminate low-order harmonic, make synthetic waveform approach sine wave, have that harmonic content is few, switching frequency is low, reliability is high, efficient is high, overload capacity by force, can not produce the extra advantages such as electromagnetic interference, simultaneously, phase shifting transformer in the system also can make the input and output electrical isolation, and is little to electric network pollution.Based on above characteristics, the multiple-pulse inversion transformation technique is widely used in high power AC driving, new forms of energy application and the quality of power supply control.
Different according to the stack object, the multiple-pulse inversion transformation technique can be divided into voltage-source type (namely realizing the voltage stack) and current source type (namely realizing the voltage stack).In the parallel network reverse occasion, during by voltage superposing control grid current, system must introduce the very complicated higher order filter of design, easily causes to be that level is unstable, has reduced the reliability of multiple-pulse current transformer.If adopt current source type multi-pulse inverter (namely realizing the electric current stack), will directly control current on line side, filtering is all very simple with control, and reliability is high.But present current source inverter superposes by the discrete phase shifting transformer outlet side electric current of realizing in parallel, and magnetic element quantity is many, and system bulk is large.
Simultaneously, in the last few years, along with the development of new energy technology and going deep into of energy-conserving and environment-protective consciousness, inverter and the border between the rectifier as the antithesis power conversion architecture are more and more fuzzyyer, and the occasion that current transformer need be finished multi-form power conversion (rectification or inversion) constantly in difference is more and more.As in direct current microgrid occasion, when new energy is superfluous, need by current transformer dump energy to be connected to the grid after inversion, when new energy is not enough, need by current transformer electrical network electric energy supply load after rectification.In the electric locomotive traction occasion, when locomotive normally moves, it is the power supply of locomotive motor that three-phase electric energy needs by current transformer AC energy to be transformed to direct current energy, when locomotive slows down, need by current transformer the alternating current that the direct current energy of electromotor feedback is transformed to low harmonic wave to be connected to the grid, realize taking full advantage of of electric energy.In summary, realize that energy in bidirectional flow is the inevitable requirement of multi-pulse inverter future development, also will make the multiple-pulse technology general in inversion and the realization of rectification occasion, further expand its application scenario.
Being permitted to love homeland in " the urban track traffic regenerating braking energy utilizes technical research " literary composition of Nanjing Aero-Space University proposes voltage-source type multiple-pulse current transformer is realized by the control method of space vector modulation the two-way flow of energy.But as previously mentioned, make system must introduce the very complicated higher order filter of design by voltage superposing control grid current, and easily cause to be that level is unstable, reduced the reliability of multiple-pulse current transformer.If can realize current source type multi-pulse inverter energy in bidirectional flow, it will directly be controlled current on line side, and filtering is all very simple with control, and reliability is high.But as previously mentioned, present current source type multi-pulse inverter superposes by the discrete phase shifting transformer outlet side electric current of realizing in parallel, and magnetic element quantity is many, and system bulk is large; Simultaneously, the switching tube of system adopts thyristor or diode usually, and its unilateral conduction makes traditional current source type multi-pulse inverter realize rectification on the basis of inversion, i.e. the transmitted in both directions energy.
Summary of the invention
The objective of the invention is on the advantage basis that conventional current source type multi-pulse inverter is controlled and filtering is easy, dwindle the volume weight of its magnetic element, overcome the shortcoming that its energy can't transmitted in both directions, propose a kind of current source type bidirectional multi-pulse current transformer based on the bidirectional switch pipe.
The objective of the invention is to realize by following measures:
Current source type bidirectional multi-pulse current transformer based on the bidirectional switch pipe, it comprises DC side circuit, reversible three-phase bridge group, multiple-pulse transformer, the three-phase alternating-current supply that connects successively, wherein seal in inductance in the DC side circuit, make DC side be approximately constant current source.It also comprises control circuit, and the signal input part of this control circuit is connected between multiple-pulse transformer and the three-phase alternating-current supply, and the control end of control circuit is connected with described reversible three-phase bridge group.
Described control circuit comprises signal processor and amplification, buffer circuit, and wherein the signal input part of signal processor is connected between multiple-pulse transformer and the three-phase alternating-current supply, amplifies, the output of buffer circuit is connected with reversible three-phase bridge group.
The group number of three-phase bridge is corresponding with the umber of pulse of multiple-pulse two way convertor in the reversible three-phase bridge group, wherein the corresponding 1 group of three-phase bridge of 6 pulse two way convertors; The corresponding 2 groups of three-phase bridge of 12 pulse two way convertors; The corresponding 3 groups of three-phase bridge of 18 pulse two way convertors; The corresponding 4 groups of three-phase bridge of 24 pulse two way convertors.
Described multiple-pulse transformer is self coupling type or isolated form, and comprises its various winding construction types, and for example 12,18 pulse transformer winding constructions can be P type (Polygon), D type (Delta) or DT type.
The connection of reversible three-phase bridge group can link to each other for each three-phase bridge two ends same polarity end points, links to each other with DC side circuit two-end-point again, and each brachium pontis mid point is connected with multiple-pulse transformer corresponding interface successively.Also can adopt other connected mode.
When described multiple-pulse transformer is 12 or 24 pulse two way convertor, preferably access interphase reactor between described DC side circuit and the reversible three-phase bridge group, the access interphase reactor can be realized each three-phase bridge electric current current-sharing.Also can not connect interphase reactor.
Each three-phase bridge two ends end points of reversible three-phase bridge group links to each other with the interphase reactor of corresponding multiple-pulse current transformer, and each brachium pontis mid point is connected with multiple-pulse transformer corresponding interface successively.
The switch element of reversible three-phase bridge group adopts switching tube or the combination switch pipe of voltage dual quadrant, electric current dual quadrant.
Described reversible three-phase bridge group is that energy when transmission direction of current flow can realize the three-phase bridge group that changes, and its switching tube adopts the combination switch pipe of bidirectional thyristor, two-way shutoff IGBT switching tube or two reverse thyristor parallel connections.
The present invention's technical characteristics compared with prior art:
1, the present invention adopts the multiple-pulse transformer of integrated form to replace discrete phase shifting transformer in the type inverter of conventional current source, has significantly reduced the volume of system's magnetic element;
2, adopt the switching tube of voltage dual quadrant, electric current dual quadrant or the basic switch elements that the combination switch pipe forms three-phase bridge, make the switching tube of current source type multiple-pulse current transformer possess the ability of energy in bidirectional flow, prevented that simultaneously short-circuit conditions appears in switching tube in the commutation overlap angle, and realized its zero-current switching.
3, adopt signal processor to detect three phase mains phase angle and cycle, in conjunction with the conducting polar plot generation driving signal of each multiple-pulse current transformer, realized the effective control to the electric current two-way flow.
Based on circuit topological structure set forth above, the present invention has realized the two-way flow of conventional current source type multi-pulse inverter energy; Compared to conventional current source type multi-pulse inverter, system's magnetic element volume has had significantly and has reduced; Compared to voltage-source type multiple-pulse two way convertor, it has control loop and design of filter is simple, the system reliability advantages of higher.
Description of drawings
Accompanying drawing 1 is the current source type bidirectional multi-pulse converter structure schematic diagram based on the bidirectional switch pipe of the present invention.
Accompanying drawing 2 is structural representations of a kind of amplification of the present invention, buffer circuit.
Accompanying drawing 3 is isolated form 6 pulse two way convertor structural representations of the present invention.
Accompanying drawing 4 is self coupling type 12 pulse two way convertor structural representations of the present invention.
Accompanying drawing 5 is isolated form 18 pulse two way convertor structural representations of the present invention.
Accompanying drawing 6 is self coupling type 24 pulse two way convertor structural representations of the present invention.
Accompanying drawing 7 is the reversible three-phase bridge group of 18 pulse two way convertors of the present invention structural representations.
Accompanying drawing 8 is 18 pulse two way convertor switching tube conducting polar plots of the present invention.
Accompanying drawing 9 is a kind of winding diagrams of switch element in DC side and the reversible three-phase bridge group in the bidirectional multi-pulse converter structure of the present invention.
Accompanying drawing 10 is 18 pulse two way convertors of the present invention input voltage and current waveform figures when being operated in rectification state.
Accompanying drawing 11 is voltage waveforms of 18 pulse two way convertors of the present invention resistive load when being operated in the passive inverter state.
Main designation in the above-mentioned accompanying drawing: 1 is the DC side circuit, and 2 is interphase reactor, and 3 is reversible three-phase bridge group, and 4 is the multiple-pulse transformer, and 5 is three-phase alternating-current supply, and 6 is phase-locked loop, and 7 is driver, and 8 is control circuit,
v Pulse Be the pulse signal of DSP generation,
C p Be speed-up capacitor,
R p Be build-out resistor,
v Drive Be the driving signal through amplifying, obtaining behind the buffer circuit, after connect switching tube,
v a ,
v b ,
v c Be three-phase phase voltage,
oBe the three-phase voltage mid point,
A, b, c, a ', b ', c ', a ", b ", c ", a 1 , a 2 , a 3 , a 4 , b 1 , b 2 , b 3 , b 4 , c 1 , c 2 , c 3 , c 4Be the voltage vector and corresponding brachium pontis numbering of Transformer structure,
V Ab ,
V Ac Deng being switching tube conducting vector,
L 1,
L 2,
L 3Be interphase reactor,
LBe the DC side inductance,
CBe dc bus capacitor.
Embodiment
Embodiment one:
Accompanying drawing 1 has provided the current source type bidirectional multi-pulse converter structure schematic diagram based on the bidirectional switch pipe of the present invention.
DC side circuit (1), reversible three-phase bridge group (3), multiple-pulse transformer (4), three-phase alternating-current supply (5) and the control circuit (8) of comprising of the present invention.When system is 12 or 24 pulse two way convertor, preferably access interphase reactor (2) between described DC side circuit (1) and the reversible three-phase bridge group (3), to realize each three-phase bridge electric current current-sharing.
The multiple-pulse transformer can adopt all kinds transformer of corresponding pulses number in 6,12,18,24 pulse two way convertor counter structures.
Described reversible three-phase bridge group can be in parallel by bidirectional thyristor, two reverse thyristors, can two-way shutoff IGBT etc. voltage dual quadrant, the switching tube of electric current dual quadrant or the basic switch elements that the combination switch pipe forms consist of.
The group number of three-phase bridge is relevant with the umber of pulse of multiple-pulse two way convertor in the described reversible three-phase bridge group structure, corresponding 1 group of three-phase bridge of 6 pulse two way convertors wherein, the corresponding 2 groups of three-phase bridge of 12 pulse two way convertors, the corresponding 3 groups of three-phase bridge of 18 pulse two way convertors, the corresponding 4 groups of three-phase bridge of 24 pulse two way convertors.
When system was 12 or 24 pulse two way convertor, accessible interphase reactor (2) was realized each three-phase bridge electric current current-sharing between DC side circuit (1) and the reversible three-phase bridge group (3).
Control circuit (8) is comprised of signal processor (6) and amplification, buffer circuit (7).
Provided control circuit block diagram (8) in the accompanying drawing 1, control circuit (8) comprises signal processor (6) and amplification, buffer circuit (7), amplify, buffer circuit (7) principle as shown in Figure 2.The signal input part of signal processor (6) is connected between multiple-pulse transformer (4) and the three-phase alternating-current supply (5), and the output of amplification, buffer circuit (7) is connected with reversible three-phase bridge group (3).Reversible three-phase bridge group (3) is when accessing interphase reactor (2) between DC side circuit (1) and the reversible three-phase bridge group (3), each three-phase bridge two ends end points links to each other with the interphase reactor of corresponding multiple-pulse current transformer, and each brachium pontis mid point is connected with multiple-pulse transformer (4) corresponding interface successively.Wherein signal processor (6) can adopt energy detection waveform zero crossing and the dsp chip in cycle or other simulations and digital circuit; Amplification, buffer circuit (7) adopt the various circuit topologies that amplify, isolate driving signal.Fig. 2 is a kind of amplification, buffer circuit, and wherein amplifying circuit adopts the totem-pote circuit that triode forms, and buffer circuit adopts the HCPL3120 chip to realize respectively driving the signal isolation.
Control procedure of the present invention is: system works is when rectification or parallel network reverse state, signal processor detects the cycle of three phase mains in the control circuit, find certain phase voltage by the positive zero crossing of negative change, corresponding vector is as starting point in the corresponding multiple-pulse converter switches pipe conducting polar plot, generate successively and drive signal, and through amplify, buffer circuit amplifies, isolates it, with conducting respective switch pipe respective angles.When system works then only needs take any vector as starting point during at the passive inverter state, get final product according to switching tube conducting polar plot successively actuating switch pipe.
Embodiment two:
As shown in Figure 3, isolated form 6 pulse two way convertor structures among the present invention.Do not connect interphase reactor (2) between DC side circuit (1) and the reversible three-phase bridge group (3), each three-phase bridge two ends same polarity end points links to each other, and links to each other with DC side circuit two-end-point again, and each brachium pontis mid point is connected with multiple-pulse transformer corresponding interface successively.
Embodiment three:
Self coupling type 12 pulse two way convertor structures of the present invention as shown in Figure 4.10
Embodiment four:
The below will take the 18 pulse two way convertors of isolated form shown in the accompanying drawing 5 as example, introduce operation principle of the present invention in detail.
Isolated form 18 pulse two way convertor three-phase bridge part in parallel is three three-phase bridge parallel connections as shown in Figure 7, and totally nine groups of brachium pontis can be according to the voltage vector reference numeral of Transformer structure
A, b, c, a ', b ', c ', a ", b ", c "System works detects cycle of three phase mains by signal processor when rectification or parallel network reverse state, find
aPhase voltage is by negative positive zero crossing, herein the conducting vector of becoming
V Cb 10 °, namely drive
cOn the brachium pontis pipe with
bThe pipe conducting is 10 ° under the brachium pontis, afterwards according to the clockwise successively conducting of the polar plot of switching tube conducting shown in the accompanying drawing 8
V C ' b ,
V A " b 20 ° of isovectors.When system works then only needs take any vector as starting point during at the passive inverter state, get final product according to switching tube conducting polar plot successively actuating switch pipe.Simultaneously, because multiple-pulse current transformer of the present invention belongs to the current source type converter, to seal in inductance in DC side and keep the DC side current constant, cause inductance energy to be released nowhere for preventing three-phase bridge no current path, and then the damage circuit, need between two pipes that are about to alternate conduction drive, to add the commutation overlap angle.
Embodiment five:
Accompanying drawing 9 is a kind of connection of switch element in DC side and the reversible three-phase bridge group, this three-phase bridge switch element is that two reverse thyristors are in parallel, need to prove that this three-phase bridge switching tube adopts switching tube or the combination switch pipe of voltage dual quadrant, electric current dual quadrant, as bidirectional thyristor, can two-way shutoff IGBT etc. all can.Take 18 pulse two way convertors as example, its working method is: when being operated in rectification state, each combination switch pipe is that the right side pipe is effective, namely according to the conducting sequential of switching tube among the switching vector selector figure shown in Figure 8, open successively clockwise the right pipe in each reverse parallel connection thyristor combination, realize rectification function; When being operated in inverter mode, each switching tube is combined as the left side pipe effectively, and namely according to the conducting sequential of switching tube among the switching vector selector figure shown in Figure 8, the left pipe during each reverse parallel connection thyristor of conducting makes up is successively clockwise realized invert function.
Embodiment six:
The structure of self coupling type 24 pulse two way convertors of the present invention as shown in Figure 6.
Application example
For verifying feasibility of the present invention, carry out experimental verification as an example of the isolated form 18 pulse two way convertors shown in the accompanying drawing 5 example.The waveform of AC input voltage and input current when accompanying drawing 10 is operated in rectification state for current transformer, wherein
v a ,
v b Be respectively
aWith
bThe phase phase voltage,
i a ,
i b Be respectively
aWith
bThe phase input current.Accompanying drawing 11 is operated in the passive inverter state for current transformer, when exchanging the side joint resistive load
v a ,
v b Waveform (current waveform is proportionate relationship with it).Can find out that system has realized the two-way flow of current source type multi-pulse inverter energy.
The operation principle of other types multiple-pulse two way convertor is similar to the above.
As seen from the above description, the current source type bidirectional multi-pulse current transformer based on the bidirectional switch pipe of the present invention's proposition has the following advantages:
Claims (9)
1. based on the current source type bidirectional multi-pulse current transformer of bidirectional switch pipe, it comprises DC side circuit (1) and three-phase alternating-current supply (5), it is characterized in that: further comprising reversible three-phase bridge group (3), multiple-pulse transformer (4) and control circuit (8), DC side circuit (1) wherein, reversible three-phase bridge group (3), multiple-pulse transformer (4), three-phase alternating-current supply (5) connects successively, the signal input part of described control circuit (8) is connected between multiple-pulse transformer (4) and the three-phase alternating-current supply (5), and the control end of control circuit (8) is connected with described reversible three-phase bridge group (3).
2. bidirectional multi-pulse current transformer according to claim 1, it is characterized in that: described control circuit (8) comprises signal processor (6) and amplification, buffer circuit (7), wherein the signal input part of signal processor (6) is connected between multiple-pulse transformer (4) and the three-phase alternating-current supply (5), and the output of amplification, buffer circuit (7) is connected with reversible three-phase bridge group (3).
3. bidirectional multi-pulse current transformer according to claim 1 and 2 is characterized in that: the group number of three-phase bridge is corresponding with the umber of pulse of multiple-pulse two way convertor in the reversible three-phase bridge group (3), wherein 1 group of three-phase bridge of 6 pulse two way convertors correspondence; The corresponding 2 groups of three-phase bridge of 12 pulse two way convertors; The corresponding 3 groups of three-phase bridge of 18 pulse two way convertors; The corresponding 4 groups of three-phase bridge of 24 pulse two way convertors.
4. bidirectional multi-pulse current transformer according to claim 3, it is characterized in that: described multiple-pulse transformer (4) is self coupling type or isolated form, and comprises its various winding construction types.
5. bidirectional multi-pulse current transformer according to claim 3, it is characterized in that: the connection of reversible three-phase bridge group (3) links to each other for each three-phase bridge two ends same polarity end points, link to each other with DC side circuit (1) two-end-point, each brachium pontis mid point is connected with multiple-pulse transformer (4) corresponding interface successively again.
6. bidirectional multi-pulse current transformer according to claim 3 is characterized in that: when described multiple-pulse transformer (4) is 12 or 24 pulse two way convertor, access interphase reactor (2) between described DC side circuit (1) and the reversible three-phase bridge group (3).
7. bidirectional multi-pulse current transformer according to claim 6, it is characterized in that: each three-phase bridge two ends end points of reversible three-phase bridge group (3) links to each other with the interphase reactor of corresponding multiple-pulse current transformer, and each brachium pontis mid point is connected with multiple-pulse transformer (4) corresponding interface successively.
8. bidirectional multi-pulse current transformer according to claim 1 is characterized in that: the switch element employing voltage dual quadrant of reversible three-phase bridge group (3), switching tube or the combination switch pipe of electric current dual quadrant.
9. bidirectional multi-pulse current transformer according to claim 8 is characterized in that: the combination switch pipe of switching tube employing bidirectional thyristor, two-way shutoff IGBT switching tube or the two reverse thyristor parallel connections of described reversible three-phase bridge group (3).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980047A (en) * | 2015-06-15 | 2015-10-14 | 南京航空航天大学 | 24 pulse aviation self-coupling transformer rectifier based on star-shaped primary-side winding phase shift |
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| CN1059055A (en) * | 1990-08-17 | 1992-02-26 | 西屋电气公司 | 18-pulse type AC/DC or the DC/AC converter system optimized |
| WO2007069556A1 (en) * | 2005-12-12 | 2007-06-21 | Chiyoda Co., Ltd. | High-frequency modulation/demodulation multiphase rectifying device |
| CN101364732A (en) * | 2008-06-18 | 2009-02-11 | 北京交通大学 | Large power modularized DC power supply apparatus and control method thereof |
| CN101939902A (en) * | 2008-02-06 | 2011-01-05 | 西门子公司 | Converter |
-
2013
- 2013-01-21 CN CN2013100209741A patent/CN103078546A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059055A (en) * | 1990-08-17 | 1992-02-26 | 西屋电气公司 | 18-pulse type AC/DC or the DC/AC converter system optimized |
| WO2007069556A1 (en) * | 2005-12-12 | 2007-06-21 | Chiyoda Co., Ltd. | High-frequency modulation/demodulation multiphase rectifying device |
| CN101939902A (en) * | 2008-02-06 | 2011-01-05 | 西门子公司 | Converter |
| CN101364732A (en) * | 2008-06-18 | 2009-02-11 | 北京交通大学 | Large power modularized DC power supply apparatus and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980047A (en) * | 2015-06-15 | 2015-10-14 | 南京航空航天大学 | 24 pulse aviation self-coupling transformer rectifier based on star-shaped primary-side winding phase shift |
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Application publication date: 20130501 |