CN114448273A - 24-pulse rectifier with double single-phase half-wave rectifying circuits - Google Patents

24-pulse rectifier with double single-phase half-wave rectifying circuits Download PDF

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CN114448273A
CN114448273A CN202011222508.8A CN202011222508A CN114448273A CN 114448273 A CN114448273 A CN 114448273A CN 202011222508 A CN202011222508 A CN 202011222508A CN 114448273 A CN114448273 A CN 114448273A
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phase
group
transformers
secondary winding
double
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王景芳
陈安臣
姚绪梁
吕雨生
马赫
冯帅
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Harbin Engineering University
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Harbin Engineering University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output

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Abstract

A24-pulse rectifier with double single-phase half-wave rectification circuits belongs to the technical field of power electronics. The invention aims to solve the problem of how to realize the multiplication of the pulse wave number of the rectifier by low additional conduction loss and effectively inhibit the harmonic wave generated by the rectifier while improving the symmetry and consistency of the phase-shifting transformer winding structure. Comprises a first group of single-phase transformers, a second group of single-phase transformers, a first group of three-phase full-bridge rectifying circuits, a second group of three-phase full-bridge rectifying circuits, a balance reactor with double secondary windings and a diode D1Diode D2Capacitor C1And a capacitor C2(ii) a Wherein, two secondary windings of the balance reactor with double secondary windings and the diode D1And a diode D2Forming a double single-phase half-wave rectification circuit; balance electricity with double secondary windingsReactor, diode D1Diode D2Capacitor C1And a capacitor C2An auxiliary pulse multiplying circuit is formed. The invention is mainly used for rectification.

Description

24-pulse rectifier with double single-phase half-wave rectifying circuits
Technical Field
The invention belongs to the technical field of power electronics.
Background
With the rapid development of society, the capacity of industrial electric equipment is continuously increased. The 12-pulse rectifier has the advantages of simple circuit structure, low cost, high reliability, small EMI (electro-magnetic interference) and the like, and is often used as an interface circuit of high-power electric equipment and a power grid in the fields of variable frequency speed regulation, urban rail power supply, electrolytic plating, ship electric propulsion and the like. However, the strong nonlinearity of the rectifying device can cause the rectifying device to inject more harmonic waves into a power grid, and the rectifying device can not meet the requirements of harmonic wave standards such as IEEE519 and IEC when used alone. In addition, the consistency of winding parameters is poor due to different connection modes of secondary windings of the phase-shifting transformer, so that the input current of the rectifier contains non-characteristic subharmonics.
In order to further improve the harmonic suppression capability of the 12-pulse rectifier, effectively reduce the input current harmonic thereof, and increase the pulse number thereof is one of the most effective methods. The current methods for increasing the number of rectifier pulses mainly include two methods, one is to further subdivide the number of output voltage phases of the phase-shifting transformer, and then obtain rectifiers with higher number of pulses, such as 18 pulses, 20 pulses and 24 pulses, through phase-shifting multiple coupling, so that the input current harmonics are effectively suppressed. However, the method increases the number of the phase-shifting transformer or the phase-shifting transformation winding, improves the manufacturing complexity of the phase-shifting transformer, ensures the symmetry and consistency among the transformer windings, and easily generates non-characteristic subharmonics in the input current of the rectifier. The second method is to increase the pulse number of the rectifier by adopting a tap changer, and the tap changer increases the state of the output current of the rectifier bridge by alternately conducting two diodes on a tap and forming a circulating current without passing through a load on a direct current side, and then realizes the multiplication of the pulse number of the rectifier according to the current relationship of the alternating current side and the direct current side. The method has the advantages of simple circuit structure, high reliability, easy realization and the like, but the diode on the tap is connected in series with the load path, so that larger conduction loss can be generated, and the method is not easy to be applied to middle-low voltage and high-power occasions.
Therefore, how to realize the multiplication of the rectifier pulse number with low additional conduction loss while improving the symmetry and consistency of the phase-shifting transformer winding structure and effectively inhibiting the harmonic waves generated by the rectifier becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the problem of how to realize the multiplication of the pulse wave number of a rectifier by low additional conduction loss and effectively inhibit the harmonic wave generated by the rectifier while improving the symmetry and consistency of the phase-shifting transformer winding structure; the invention provides a 24-pulse rectifier with double single-phase half-wave rectifying circuits.
A24-pulse rectifier with double single-phase half-wave rectification circuits comprises a first group of single-phase transformers 1, a second group of single-phase transformers 2, a first group of three-phase full-bridge rectification circuits 3, a second group of three-phase full-bridge rectification circuits 4, a balance reactor 5 with double secondary windings, and a diode D1Diode D2Capacitor C1And a capacitor C2(ii) a Wherein, two secondary windings of the balance reactor 5 with double secondary windings, and the diode D1And a diode D2Forming a double single-phase half-wave rectification circuit; balance reactor 5 with double secondary windings and diode D1Diode D2Capacitor C1And a capacitor C2Forming an auxiliary pulse wave multiplying circuit;
the first group of single-phase transformers 1 and the second group of single-phase transformers 2 are identical in structure and form a phase-shifting transformer, and the phase-shifting transformer is used for shifting the phase of a three-phase power supply to generate two groups of three-phase alternating currents with the phase difference of 30 degrees and respectively supply power to the first group of three-phase full-bridge rectification circuits 3 and the second group of three-phase full-bridge rectification circuits 4; wherein, the current amplitudes of the two groups of three-phase alternating currents with the phase difference of 30 degrees are the same;
the positive output end of the first group of three-phase full-bridge rectification circuits 3 and the positive output end of the second group of three-phase full-bridge rectification circuits 4 are respectively connected with two ends of a primary winding of a balance reactor 5 with double secondary windings; the negative output end of the first group of three-phase full-bridge rectification circuit 3 and the negative output end of the second group of three-phase full-bridge rectification circuit 4 are both connected with one end of a load 6;
a primary side center tap of a balance reactor 5 with double secondary side windings is connected with the other end of a load 6;
balance reactor 5 with double secondary windings, and homonymous terminal of first secondary winding and diode D1Is connected to the anode of diode D1With the other end of the load 6 and a capacitor C1Are connected at the same time;
homonymous terminal of second secondary winding of balance reactor 5 with double secondary windings and capacitor C2Is connected to one end of the load 6 at the same time;
balance reactor 5 with double secondary windings and diode D and different name end of second secondary winding of balance reactor2Is connected to the anode of diode D2The cathode of the balance reactor 5, the synonym terminal of the first secondary winding of the balance reactor 5 with the double secondary windings and the capacitor C1Another terminal of (2) and a capacitor C2While the other ends are connected at the same time.
Preferably, the first group of single-phase transformers 1 and the second group of single-phase transformers 2 in the phase-shifting transformer are both provided with a primary winding and six secondary windings; six secondary windings of the two groups of single-phase transformers are sequentially a first secondary winding to a sixth secondary winding from top to bottom;
two ends of a primary winding of the first group of single-phase transformers 1 are respectively connected with the phase A and the phase B of the three-phase power supply, and two ends of a primary winding of the second group of single-phase transformers 2 are respectively connected with the phase B and the phase C of the three-phase power supply;
the homonymous ends of the first secondary windings of the first group of single-phase transformers 1, the synonym ends of the fourth secondary windings of the first group of single-phase transformers 1 and the homonymous ends of the fourth secondary windings of the second group of single-phase transformers 2 are simultaneously connected;
the synonym end of the first secondary winding of the first group of single-phase transformers 1 is connected with the homonymous end of the sixth secondary winding of the second group of single-phase transformers 2;
the second secondary winding homonymous terminal of the first group of single-phase transformer 1 is used as the c-phase power c2 in the second group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a second secondary winding of the first group of single-phase transformers 1 is connected with the synonym end of a fourth secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the third secondary winding of the first group of single-phase transformers 1 is connected with the homonymous terminal of the first secondary winding of the second group of single-phase transformers 2;
the synonym end of the third secondary winding of the first group of single-phase transformers 1 is simultaneously connected with the synonym end of the second secondary winding of the second group of single-phase transformers 2 and the synonym end of the third secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the fourth secondary winding of the first group of single-phase transformers 1 is connected with the heteronymous terminal of the fifth secondary winding of the second group of single-phase transformers 2;
the dotted terminal of the fifth secondary winding of the first group of single-phase transformer 1 is used as the b-phase power b1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a fifth secondary winding of the first group of single-phase transformers 1 is connected with the homonymous end of a second secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the sixth secondary winding of the first group of single-phase transformers 1 is connected with the synonym terminal of the third secondary winding of the second group of single-phase transformers 2;
the synonym terminal of the sixth secondary side winding of the first group of single-phase transformer 1 is used as the c-phase power c1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the first secondary winding synonym terminal of the second group of single-phase transformers 2 is used as a-phase power a1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the dotted terminal of the fifth secondary winding of the second group of single-phase transformers 2 is used as the a-phase power a2 in the second group of three-phase alternating current output by the phase-shifting transformer;
and the synonym terminal of the sixth secondary winding of the second group of single-phase transformer 2 is used as the b-phase power b2 in the second group of three-phase alternating current output by the phase-shifting transformer.
Preferably, the turn ratio of one primary winding to six secondary windings of the first group of single-phase transformers 1 or the second group of single-phase transformers 2 is:
Figure BDA0002762560800000031
wherein k is a real number greater than 0.
Preferably, the first three-phase full-bridge rectification circuit 3 and the second three-phase full-bridge rectification circuit 4 are both rectifiers implemented by using silicon diodes or SiC diodes.
Preferably, the two secondary windings of the balance reactor 5 with double secondary windings have the same turn ratio with the primary winding, and any one of the secondary winding turns N of the balance reactor 5 with double secondary windings is provided with the same number of turns NsAnd the number of turns N of the primary windingpThe ratio of the current to the voltage is 7.085, and at this time, the current pulse of the three-phase power supply is 24, and the current THD of the three-phase power supply takes a minimum value of 7.52%.
The invention has the following beneficial effects:
on one hand, the phase-shifting transformer is formed by adopting double single-phase transformers with the same winding configuration, so that the symmetry and consistency of the winding structure of the phase-shifting transformer are ensured, the output currents of the first group of three-phase full-bridge rectifying circuits 3 and the second group of three-phase full-bridge rectifying circuits 4 are actively equalized, the output currents of the first group of three-phase full-bridge rectifying circuits 3 and the second group of three-phase full-bridge rectifying circuits 4 are approximately the same, the consistency of the output currents of the first group of three-phase full-bridge rectifying circuits 3 and the second group of three-phase full-bridge rectifying circuits 4 is ensured, and the generation of non-characteristic subharmonics in the input current of the proposed 24-pulse rectifier is avoided; namely: the 24-pulse rectifier with the double single-phase half-wave rectification circuits avoids the defect that in the prior art, due to the fact that the transformer winding structures are different, the output currents of all full-bridge rectification circuits are different in magnitude, and therefore non-characteristic subharmonics are prone to being generated in the input currents of the rectifier.
On the other hand, when multiplying the rectifier pulse, a double single-phase half-wave rectifier circuit composed of two secondary windings of the balance reactor 5 with double secondary windings, the diode D, and the load are connected in parallel1And a diode D2The turn ratio of the primary winding to the secondary winding of the balance reactor 5 with the double secondary windings is 1: 7.085, the conduction loss generated by the parallel connection of the double single-phase half-wave rectification circuit on the load current path is avoided, the current grade of the double single-phase half-wave rectification circuit is very low, and the additional conduction loss generated by the pulse wave multiplication circuit is effectively reduced.
Therefore, by combining the two points, the 24-pulse rectifier with the double single-phase half-wave rectification circuit effectively suppresses the input current harmonic wave of the rectifier, effectively reduces the additional conduction loss generated by the pulse multiplication circuit, and improves the energy conversion efficiency.
According to the 24-pulse rectifier with the double single-phase half-wave rectification circuits, the turn ratio of the secondary primary winding of the balance reactor 5 with the double secondary windings is 7.085 when the 24-pulse rectifier is applied specifically, so that the on-state current of a diode in the auxiliary pulse wave multiplying circuit is small, the additional conduction loss generated by the auxiliary pulse wave multiplying circuit is effectively reduced, and the 24-pulse rectifier is ensured to have high energy conversion efficiency. The output of a single-phase half-wave rectifier circuit formed by diodes connected with each secondary winding of the balance reactor 5 with double secondary windings is always connected with a capacitor (namely, the capacitor C)1Or a capacitor C2) Are connected in series. Because the capacitor provides half of the output voltage, the secondary winding of the balance reactor 5 with double secondary windings only needs to provide the other half of the output voltage, and the diode D in the pulse wave multiplying circuit can be used1Or D2And conducting and supplying power to the load, so that the turn ratio of the primary winding and the secondary winding of the balance reactor 5 with the double secondary windings is not too large, and the processing and the manufacturing are facilitated.
The 24-pulse rectifier with double single-phase half-wave rectification circuits can be simulated by adopting a balance reactor 5 with double secondary windings and a diode D1Diode D2Capacitor C1And a capacitor C2The formed auxiliary pulse multiplication circuit is applied to 12-pulse rectification in other structural forms, and the conventional 12-pulse rectifier is upgraded to a 24-pulse rectifier, so that the input current harmonic waves and the output voltage ripple waves of the rectifier are effectively inhibited.
Drawings
FIG. 1 is a schematic structural diagram of a 24-pulse rectifier with dual single-phase half-wave rectifier circuits according to the present invention; wherein u isaA-phase voltage, i, for a three-phase power supplyaPhase a current u for three-phase power supplybB-phase voltage, i, for a three-phase power supplybPhase b current u for three-phase power supplycC-phase voltage i of three-phase power supplycPhase c-current, i, for a three-phase power supplya1A-phase current, i, of a first three-phase alternating current generated for a phase-shifting transformerb1B-phase current, i, of a first set of three-phase alternating currents generated for a phase-shifting transformerc1C-phase current i of a first set of three-phase alternating currents generated for a phase-shifting transformera2A-phase current, i, of a second three-phase AC set generated for a phase-shifting transformerb2B-phase current, i, of a second three-phase current set generated for a phase-shifting transformerc2C-phase current, i, of a second set of three-phase alternating currents generated for the phase-shifting transformerd1The current i output from the positive output terminal of the first three-phase full-bridge rectification circuit 3d2The current i output from the positive output terminal of the second three-phase full-bridge rectification circuit 4pThe current u flowing out from the center tap of the primary winding of the balance reactor 5 with double secondary windingssFor each secondary winding of a balancing reactor 5 with double secondary windings, a voltage u is outputdIs the voltage across the load 6;
FIG. 2 is a schematic of the structure of a single-phase transformer winding; wherein N is1Is the number of turns of the primary winding of the single-phase transformer, Nt1The number of turns of the first secondary winding of the single-phase transformer, Nt2The number of turns of the second secondary winding of the single-phase transformer, Nt3The number of turns of the third secondary winding of the single-phase transformer, Nt4The number of turns of the fourth secondary winding of the single-phase transformer, Nt5The number of turns of a fifth secondary winding of the single-phase transformer, Nt6The number of turns of a sixth secondary winding of the single-phase transformer is set;
fig. 3 is a schematic structural diagram of the balance reactor 5 with double secondary windings; wherein u ispInputting voltage for a primary winding of a balance reactor 5 with double secondary windings; u. ofsFor each secondary winding of a balancing reactor 5 with double secondary windings, isThe output current of the same-name end of each secondary winding of the balance reactor 5 with double secondary windings is obtained;
FIG. 4 is a voltage vector diagram of a phase-shifting transformer formed by a first group of single-phase transformers 1 and a second group of single-phase transformers 2 according to the present invention; wherein u isabFor line voltage between a-phase and b-phase of a three-phase power supply, ubcThe voltage between the b phase and the c phase of the three-phase power supply is supplied,n is a neutral point of a three-phase power supply;
FIG. 5 is a schematic diagram of the auxiliary pulse multiplier circuit in the operating mode;
FIG. 6 is a mode diagram of the auxiliary pulse multiplying circuit in the second operating mode;
fig. 7 is a mode diagram of the auxiliary pulse multiplication circuit in the third operation mode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the 24-pulse rectifier with double single-phase half-wave rectifier circuit according to the present embodiment includes a first single-phase transformer 1, a second single-phase transformer 2, a first three-phase full-bridge rectifier circuit 3, a second three-phase full-bridge rectifier circuit 4, a balance reactor 5 with double secondary windings, and a diode D1Diode D2Capacitor C1And a capacitor C2(ii) a Wherein, two secondary windings of the balance reactor 5 with double secondary windings and the diode D1And a diode D2Forming a double single-phase half-wave rectification circuit; balance reactor 5 with double secondary windings and diode D1Diode D2Capacitor C1And a capacitor C2Forming an auxiliary pulse wave multiplying circuit;
the first group of single-phase transformers 1 and the second group of single-phase transformers 2 have the same structure, and form a phase-shifting transformer, and the phase-shifting transformer is used for shifting the phase of a three-phase power supply to generate two groups of three-phase alternating currents with the phase difference of 30 degrees, and respectively supplies power to the first group of three-phase full-bridge rectification circuits 3 and the second group of three-phase full-bridge rectification circuits 4; wherein, the current amplitudes of the two groups of three-phase alternating currents with the phase difference of 30 degrees are the same;
the positive output end of the first group of three-phase full-bridge rectification circuits 3 and the positive output end of the second group of three-phase full-bridge rectification circuits 4 are respectively connected with two ends of a primary winding of a balance reactor 5 with double secondary windings; the negative output end of the first group of three-phase full-bridge rectification circuit 3 and the negative output end of the second group of three-phase full-bridge rectification circuit 4 are both connected with one end of a load 6;
a primary side center tap of a balance reactor 5 with double secondary side windings is connected with the other end of a load 6;
balance reactor 5 with double secondary windings, and homonymous terminal of first secondary winding and diode D1Is connected to the anode of diode D1With the other end of the load 6 and a capacitor C1Are connected at the same time;
homonymous terminal of second secondary winding of balance reactor 5 with double secondary windings and capacitor C2Is connected to one end of the load 6 at the same time;
balance reactor 5 with double secondary windings and diode D and different name end of second secondary winding of balance reactor2Anode connection of (2), diode D2The cathode of the balance reactor 5, the synonym terminal of the first secondary winding of the balance reactor 5 with the double secondary windings and the capacitor C1Another terminal of (1) and a capacitor C2While the other ends are connected at the same time.
In this embodiment, the auxiliary pulse multiplying circuit has three operating modes, which are:
the first working mode is as follows: referring to fig. 5, in this mode, the absolute value | u of the output voltage of the two secondary windings of the balance reactor 5 with the two secondary windings in the auxiliary pulse multiplying circuitsIs less than the voltage u across the load 6dOne half of (3), diode D in auxiliary pulse multiplier circuit1And a diode D2Are all reversely biased to cut off and flow through a diode D1And a diode D2The output currents of the first group of three-phase full-bridge rectification circuits 3 and the second group of three-phase full-bridge rectification circuits 4 supply power to a load 6 together after passing through a primary winding center tap of a balance reactor 5 with double secondary windings.
And a second working mode: referring to fig. 6, the output voltage u of the first three-phase full-bridge rectifier circuit 3 is nowd1Is larger than the output voltage u of the second three-phase full-bridge rectification circuit 4d2Current i outputted from the same-name terminal of the first secondary winding of the balance reactor 5 with the secondary windings>0. Output voltage u of the first secondary windingsIs a positive value, and usGreater than the voltage u across the load 6dOne half of (a). Diode D in auxiliary pulse multiplying circuit1Is conducted and flows through the diode D1Current i ofs1Greater than 0, and is1＝is. The second secondary winding of the balance reactor 5 with secondary winding outputs a voltage usDiode D in auxiliary pulse multiplying circuit2Reverse bias cut-off. The first three-phase full-bridge rectification circuit 3 is conducted to output current id1>0, a second group of three-phase full-bridge rectification circuits 4 are reversely biased to be cut off, and the current id20. Output current i of a first set of three-phase full-bridge rectifier circuits 3d1After being tapped by the center of the primary side of the balance reactor 5 with the double secondary windings and flowing through a diode D1Current i ofs1Together supplying power to the load. The circuit for supplying power to the load by the first secondary winding of the balance reactor 5 with the double secondary windings is the same terminal of the first secondary winding and a diode D1A load 6 and a capacitor C2And the synonym terminal of the first secondary winding.
And a third working mode: referring to fig. 7, the output voltage u of the first set of three-phase full-bridge rectifier circuits 3 at this timed1Is less than the output voltage u of the second three-phase full-bridge rectification circuit 4d2Current i outputted from the end of the balance reactor 5 having a secondary winding of the same name as the second secondary windingsLess than 0. Second secondary winding output voltage u of balance reactor 5 with secondary windingsIs negative and-usGreater than the voltage u across the load 6dOne half of (a). Diode D in auxiliary pulse multiplying circuit2Is conducted and flows through the diode D2Current i ofs2Greater than 0, and is2＝-is. The first secondary winding of the balancing reactor 5 with secondary winding outputs a voltage of-usTwo of the auxiliary pulse multiplication circuitsPolar tube D1Reverse bias cut-off. The second three-phase full-bridge rectification circuit 4 is conducted to output current id2>0, the first three-phase full-bridge rectification circuit 3 is reversely biased to be cut off, and the current id10. Output current i of the second three-phase full-bridge rectification circuit 4d2After being tapped by the center of the primary side of the balance reactor 5 with the double secondary windings and flowing through a diode D2Current i ofs2Together supplying power to the load. The loop for supplying power to the load by the single-phase half-wave rectifier connected with the second secondary winding of the balance reactor 5 with the double secondary windings is the synonym end of the second secondary winding and the diode D2Load 6 and capacitor C1And the same-name end of the second secondary winding.
The embodiment provides a phase-shifting transformer formed by double single-phase transformers with the same winding configuration, so as to ensure the symmetry among the windings of the phase-shifting transformer, actively equalize the output currents of a first group of three-phase full-bridge rectifying circuits 3 and a second group of three-phase full-bridge rectifying circuits 4, so that the output currents of the first group of three-phase full-bridge rectifying circuits 3 and the second group of three-phase full-bridge rectifying circuits 4 are approximately the same, the consistency of the output currents of the first group of three-phase full-bridge rectifying circuits 3 and the second group of three-phase full-bridge rectifying circuits 4 is ensured, and the generation of non-characteristic subharmonics in the input current of the proposed 24-pulse rectifier is avoided; namely: the 24-pulse rectifier with the double single-phase half-wave rectification circuits avoids the defect that in the prior art, due to the fact that the transformer winding structures are different, the output currents of all full-bridge rectification circuits are different in magnitude, and therefore non-characteristic subharmonics are prone to being generated in the input currents of the rectifier.
On the other hand, when multiplying the rectifier pulse, a double single-phase half-wave rectifier circuit composed of two secondary windings of the balance reactor 5 with double secondary windings, the diode D, and the load are connected in parallel1And a diode D2The turn ratio of the primary winding to the secondary winding of the balance reactor 5 with the double secondary windings is 1: 7.085, it not only avoids the conduction loss of the double single-phase half-wave rectification circuit connected in parallel with the load current path, but also the current grade of the double single-phase half-wave rectification circuit is very low, effectively reducing the pulse wave multiplication circuitAdditional conduction losses.
The output of a single-phase half-wave rectifier circuit formed by diodes connected with each secondary winding of the balance reactor 5 with double secondary windings is always connected with a capacitor (namely, the capacitor C)1Or a capacitor C2) Are connected in series. Because the capacitor provides half of the output voltage, the secondary winding of the balance reactor 5 with double secondary windings only needs to provide the other half of the output voltage, and the diode D in the pulse wave multiplying circuit can be used1Or D2And conducting and supplying power to the load, so that the turn ratio of the primary winding and the secondary winding of the balance reactor 5 with the double secondary windings is not too large, and the processing and the manufacturing are facilitated.
Further, referring specifically to fig. 1, in the phase-shifting transformer, a first group of single-phase transformers 1 and a second group of single-phase transformers 2 both have a primary winding and six secondary windings; six secondary windings of the two groups of single-phase transformers are sequentially a first secondary winding to a sixth secondary winding from top to bottom;
two ends of a primary winding of the first group of single-phase transformers 1 are respectively connected with the phase A and the phase B of the three-phase power supply, and two ends of a primary winding of the second group of single-phase transformers 2 are respectively connected with the phase B and the phase C of the three-phase power supply;
the homonymous ends of the first secondary windings of the first group of single-phase transformers 1, the synonym ends of the fourth secondary windings of the first group of single-phase transformers 1 and the homonymous ends of the fourth secondary windings of the second group of single-phase transformers 2 are simultaneously connected;
the synonym end of the first secondary winding of the first group of single-phase transformers 1 is connected with the homonymous end of the sixth secondary winding of the second group of single-phase transformers 2;
the second secondary winding homonymous terminal of the first group of single-phase transformer 1 is used as the c-phase power c2 in the second group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a second secondary winding of the first group of single-phase transformers 1 is connected with the synonym end of a fourth secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the third secondary winding of the first group of single-phase transformers 1 is connected with the homonymous terminal of the first secondary winding of the second group of single-phase transformers 2;
the synonym end of the third secondary winding of the first group of single-phase transformers 1 is simultaneously connected with the synonym end of the second secondary winding of the second group of single-phase transformers 2 and the synonym end of the third secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the fourth secondary winding of the first group of single-phase transformers 1 is connected with the heteronymous terminal of the fifth secondary winding of the second group of single-phase transformers 2;
the dotted terminal of the fifth secondary winding of the first group of single-phase transformer 1 is used as the b-phase power b1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a fifth secondary winding of the first group of single-phase transformers 1 is connected with the homonymous end of a second secondary winding of the second group of single-phase transformers 2;
the homonymous terminal of the sixth secondary winding of the first group of single-phase transformers 1 is connected with the synonym terminal of the third secondary winding of the second group of single-phase transformers 2;
the synonym terminal of the sixth secondary winding of the first group of single-phase transformer 1 is used as the c-phase power c1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the first secondary winding synonym terminal of the second group of single-phase transformers 2 is used as a-phase power a1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the dotted terminal of the fifth secondary winding of the second group of single-phase transformers 2 is used as the a-phase power a2 in the second group of three-phase alternating current output by the phase-shifting transformer;
and the synonym terminal of the sixth secondary winding of the second group of single-phase transformer 2 is used as the b-phase power b2 in the second group of three-phase alternating current output by the phase-shifting transformer.
In the preferred embodiment, two ends of the primary winding of the first group of single-phase transformers 1 are used for collecting the voltage between the a phase and the B phase of the three-phase power supply, and two ends of the primary winding of the second group of single-phase transformers 2 are used for collecting the voltage between the B phase and the C phase of the three-phase power supply; the voltage vector diagram of the phase shifting transformer is shown in detail in fig. 4.
Further, referring specifically to fig. 2, the turn ratio of one primary winding to six secondary windings of the first group of single-phase transformers 1 or the second group of single-phase transformers 2 is:
Figure BDA0002762560800000091
where k is a real number greater than 0.
Further, referring to fig. 1 specifically, the first three-phase full-bridge rectification circuit 3 and the second three-phase full-bridge rectification circuit 4 are rectifiers implemented by silicon diodes or SiC diodes.
Further, referring specifically to fig. 3, the two secondary windings of the balance reactor 5 with double secondary windings have the same turn ratio with the primary winding, and the number of turns N of any one secondary winding of the balance reactor 5 with double secondary windingssNumber of turns of primary winding NpThe ratio of the current to the voltage is 7.085, and at this time, the current pulse of the three-phase power supply is 24, and the current THD of the three-phase power supply takes a minimum value of 7.52%.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (5)

1. A24-pulse rectifier with double single-phase half-wave rectification circuits is characterized by comprising a first group of single-phase transformers (1), a second group of single-phase transformers (2), a first group of three-phase full-bridge rectification circuits (3), a second group of three-phase full-bridge rectification circuits (4), a balance reactor (5) with double secondary windings, and a diode D1Diode D2Capacitor C1And a capacitor C2(ii) a Wherein, two secondary windings of the balance reactor (5) with double secondary windings and the diode D1And a diode D2Forming a double single-phase half-wave rectification circuit; balance reactor (5) with double secondary windings and diode D1Diode D2Capacitor C1And a capacitor C2Forming auxiliary pulse waveA multiplying circuit;
the first group of single-phase transformers (1) and the second group of single-phase transformers (2) are identical in structure and form a phase-shifting transformer, and the phase-shifting transformer is used for shifting a three-phase power supply to generate two groups of three-phase alternating currents with phases different by 30 degrees and respectively supply power to the first group of three-phase full-bridge rectification circuits (3) and the second group of three-phase full-bridge rectification circuits (4); wherein, the current amplitudes of the two groups of three-phase alternating currents with the phase difference of 30 degrees are the same;
the positive output end of the first group of three-phase full-bridge rectification circuits (3) and the positive output end of the second group of three-phase full-bridge rectification circuits (4) are respectively connected with two ends of a primary winding of a balance reactor (5) with double secondary windings; the negative output end of the first group of three-phase full-bridge rectification circuits (3) and the negative output end of the second group of three-phase full-bridge rectification circuits (4) are both connected with one end of a load (6);
a primary side center tap of the balance reactor (5) with the double secondary windings is connected with the other end of the load (6);
balance reactor (5) with double secondary windings, and homonymous terminal of first secondary winding and diode D1Is connected to the anode of diode D1With the other end of the load (6) and a capacitor C1Are connected at the same time;
balance reactor (5) with double secondary windings, homonymous terminal of second secondary winding of balance reactor and capacitor C2Is connected to one end of the load (6) at the same time;
balance reactor (5) with double secondary windings, and different name end and diode D of second secondary winding of balance reactor2Is connected to the anode of diode D2The cathode of the balance reactor (5) and the synonym end of the first secondary winding of the balance reactor (5) with double secondary windings and the capacitor C1Another terminal of (2) and a capacitor C2While the other ends are connected at the same time.
2. The 24-pulse rectifier with double single-phase half-wave rectification circuits according to claim 1, wherein the phase-shifting transformers are provided with a primary winding and six secondary windings for the first group of single-phase transformers (1) and the second group of single-phase transformers (2); six secondary windings of the two groups of single-phase transformers are sequentially a first secondary winding to a sixth secondary winding from top to bottom;
two ends of a primary winding of the first group of single-phase transformers (1) are respectively connected with the phase A and the phase B of the three-phase power supply, and two ends of a primary winding of the second group of single-phase transformers (2) are respectively connected with the phase B and the phase C of the three-phase power supply;
the homonymous ends of first secondary windings of the first group of single-phase transformers (1), the heteronymous ends of fourth secondary windings of the first group of single-phase transformers (1) and the homonymous ends of fourth secondary windings of the second group of single-phase transformers (2) are simultaneously connected;
the different-name end of the first secondary winding of the first group of single-phase transformers (1) is connected with the same-name end of the sixth secondary winding of the second group of single-phase transformers (2);
the second secondary winding homonymous terminal of the first group of single-phase transformers (1) is used as a c-phase power c2 in the second group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a second secondary winding of the first group of single-phase transformers (1) is connected with the synonym end of a fourth secondary winding of the second group of single-phase transformers (2);
the homonymous terminal of the third secondary winding of the first group of single-phase transformers (1) is connected with the homonymous terminal of the first secondary winding of the second group of single-phase transformers (2);
the synonymy end of a third secondary winding of the first group of single-phase transformers (1) is simultaneously connected with the synonymy end of a second secondary winding of the second group of single-phase transformers (2) and the homonymy end of a third secondary winding of the second group of single-phase transformers (2);
the homonymous terminal of the fourth secondary winding of the first group of single-phase transformers (1) is connected with the heteronymous terminal of the fifth secondary winding of the second group of single-phase transformers (2);
the dotted terminal of the fifth secondary winding of the first group of single-phase transformers (1) is used as b-phase power b1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the synonym end of a fifth secondary winding of the first group of single-phase transformers (1) is connected with the homonymous end of a second secondary winding of the second group of single-phase transformers (2);
the homonymous terminal of a sixth secondary winding of the first group of single-phase transformers (1) is connected with the heteronymous terminal of a third secondary winding of the second group of single-phase transformers (2);
the synonym terminal of a sixth secondary winding of the first group of single-phase transformer (1) is used as the c-phase power c1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the first secondary winding synonym terminal of the second group of single-phase transformers (2) is used as a-phase power a1 in the first group of three-phase alternating current output by the phase-shifting transformer;
the dotted terminal of the fifth secondary winding of the second group of single-phase transformers (2) is used as the a-phase power a2 in the second group of three-phase alternating current output by the phase-shifting transformer;
and the second group of single-phase transformers (2) have different name ends of a sixth secondary side winding and are used as b-phase power b2 in the second group of three-phase alternating current output by the phase-shifting transformer.
3. The 24-pulse rectifier with double single-phase half-wave rectification circuit according to claim 1, wherein the turn ratio of one primary winding to six secondary windings of the first group of single-phase transformers (1) or the second group of single-phase transformers (2) is:
Figure FDA0002762560790000021
where k is a real number greater than 0.
4. The 24-pulse rectifier with double single-phase half-wave rectification circuits according to claim 1, wherein the first three-phase full-bridge rectification circuit (3) and the second three-phase full-bridge rectification circuit (4) are rectifiers implemented by silicon diodes or SiC diodes.
5. The 24-pulse rectifier with double single-phase half-wave rectifier circuit according to claim 1, wherein the two secondary windings of the balance reactor (5) with double secondary windings have the same turn ratio with the primary winding, and the number of turns N of any one secondary winding of the balance reactor (5) with double secondary windings is the same as the number of turns of the primary windingsNumber of turns of primary winding NpThe ratio of the current to the voltage is 7.085, and at this time, the current pulse of the three-phase power supply is 24, and the current THD of the three-phase power supply takes a minimum value of 7.52%.
CN202011222508.8A 2020-11-05 2020-11-05 24-pulse rectifier with double single-phase half-wave rectifying circuits Pending CN114448273A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4383545A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4383545A1 (en) * 2022-12-05 2024-06-12 Huawei Digital Power Technologies Co., Ltd. Power supply apparatus, three-phase transformer circuit, and charging pile

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