CN109245566B - Series 36-pulse rectifier using DC side voltage injection method - Google Patents
Series 36-pulse rectifier using DC side voltage injection method Download PDFInfo
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- 238000002955 isolation Methods 0.000 claims abstract description 39
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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
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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
- H02M7/068—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 mounted on a transformer
Abstract
The invention provides a series-type 36-pulse rectifier using a direct-current side voltage injection method, and belongs to the technical field of power electronics. The invention discloses a series 36-pulse rectifier using a direct-current side voltage injection method. Because the phase difference of the output current of the three groups of three-phase full-bridge rectification circuits is 20 degrees, the harmonic injection circuit has four working modes in each power supply period, and the turn ratio of the injection transformer is determined by analyzing the four working modes, so that the output voltage of the isolation transformer is modulated, and the purpose of inhibiting the input current harmonic is achieved. The invention is suitable for high-voltage high-power rectification occasions with higher requirements on the quality of electric energy. The invention has obvious effects of improving the quality of input current electric energy and reducing the total distortion rate of current harmonic.
Description
Technical Field
The invention relates to a series 36-pulse rectifier using a direct-current side voltage injection method, and belongs to the technical field of power electronics.
Background
In the high-power rectification technology, uncontrolled power electronic devices are widely applied. However, due to strong nonlinearity of the uncontrolled device, a large amount of non-characteristic subharmonics are generated, harmonic pollution is serious, and the quality of electric energy at the alternating current side is reduced. Therefore, the harmonic suppression performance of the rectifier is improved, the harmonic generated by the rectifier system is effectively suppressed, the total harmonic distortion rate is reduced, and the method becomes an important direction for power electronic technology research. The method for improving the input current waveform of the rectifying device is an effective method for reducing harmonic pollution at the present stage.
The series 18-pulse rectifier is widely applied to high-current and high-power occasions, and although the autotransformer has large capacity and small loss and has a certain inhibiting effect on characteristic subharmonics, the alternating current side and the direct current side of the autotransformer are not provided with isolation, so that certain potential safety hazards exist; compared with a 12-pulse rectifier, the 18-pulse rectifier has lower harmonic distortion rate, and in addition, compared with a parallel connection mode, the problem of current unbalance is solved by adopting series connection; however, the series 18-pulse rectifier circuit itself still generates (18k ± 1) subharmonics.
Disclosure of Invention
The present invention is directed to solve the above problems of the prior art, and further to provide a series 36-pulse rectifier using a dc-side voltage injection method.
The purpose of the invention is realized by the following technical scheme:
the series-type 36-pulse rectifier using the direct-current side voltage injection method comprises an input inductor, an isolation transformer, a first group of three-phase full-bridge rectifying circuits, a second group of three-phase full-bridge rectifying circuits, a third group of three-phase full-bridge rectifying circuits, a direct-current side capacitor, a load, a first group of injection transformer, a second group of injection transformer, a first group of single-phase full-wave rectifying circuits and a second group of single-phase full-wave rectifying circuits; the three-phase alternating current voltage source is connected with the left side of the input inductor in series, and the right side of the input inductor is connected with the primary winding of the isolation transformer; the isolation transformer is used as a phase-shifting transformer, the primary windings of the isolation transformer are connected in a triangular mode, five secondary windings of the isolation transformer are mutually independent and form three groups of star-shaped connections, and the isolation transformer outputs three groups of three-phase voltages with the phase difference of 20 degrees; the input ends of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits are respectively connected with the output ends a1, b1, c1, a2, b2, c2, a3, b3 and c3 of the isolation transformer, and the output ends of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits are connected in series, namely the output voltage; the direct current side capacitor is formed by connecting three same capacitors in series, the upper end of the direct current side capacitor is connected with the positive electrode of the output end of the first group of three-phase full-bridge rectification circuits and the positive electrode of the load, and the lower end of the direct current side capacitor is connected with the negative electrode of the output end of the third group of three-phase full-bridge rectification circuits and the negative electrode of the load; the left input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a connection point F, S of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits, the right input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a connection point P, T of a direct-current side capacitor, and secondary windings of the first group of injection transformers and the second group of injection transformers are provided with center taps; the input ends of the first group of single-phase full-wave rectifying circuits and the second group of single-phase full-wave rectifying circuits are respectively connected with the secondary sides of the two groups of injection transformers, the output ends of the first group of single-phase full-wave rectifying circuits are respectively connected to the upper end of a capacitor C1 in the direct-current side capacitor and the lower end of a capacitor C2, and the output ends of the second group of single-phase full-wave rectifying circuits are respectively connected to the upper end of a capacitor C2 in the direct-current side capacitor.
The invention uses a series 36-pulse rectifier of a direct current side voltage injection method, the input inductor consists of three same inductors, and the three inductors are respectively connected with a three-phase alternating current voltage source usa、usb、uscThe three capacitors are connected in series to form an equivalent current source, and the direct-current side capacitor is formed by connecting three capacitors in series.
The invention relates to a series 36-pulse rectifier using a direct-current side voltage injection method, wherein an isolation transformer consists of three core columns, each core column is provided with 6 windings, one primary side winding and five secondary side windings, and the turn ratio of the six windings is
The primary windings a, b and c are connected in a delta mode, the windings a2, b2, c2, a3, b3 and c3 are secondary windings connected in a first star mode, the windings a1, b1 and c1 are secondary windings connected in a second star mode, and the windings a4, b4, c4, a5, b5 and c5 are secondary windings connected in a third star mode; the windings a, a1, a2, a3, a4 and a5 are located on the same core column, the windings b, b1, b2, b3, b4 and b5 are located on the same core column, and the windings c, c1, c2, c3, c4 and c5 are located on the same core column.
The invention uses a series-connection type 36-pulse rectifier adopting a direct-current side voltage injection method, and the first group of three-phase full-bridge rectification circuit, the second group of three-phase full-bridge rectification circuit and the third group of three-phase full-bridge rectification circuit all adopt diodes as rectification devices.
The invention uses a series-connection type 36-pulse rectifier adopting a direct current side voltage injection method, and the output currents of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits are 6-pulse currents with the same average value and 20-degree phase difference.
The invention uses a series-type 36-pulse rectifier of a direct-current side voltage injection method, and the first injection transformer and the second injection transformer are single-phase transformers.
The invention uses a series-type 36-pulse rectifier of a direct-current side voltage injection method, and the first group of single-phase full-wave rectification circuits and the second group of single-phase full-wave rectification circuits are composed of two diodes.
According to the series 36-pulse rectifier adopting the direct-current side voltage injection method, as the phase difference of the output currents of the three groups of three-phase full-bridge rectification circuits is 20 degrees, the harmonic injection circuit has four working modes in each power supply period, and the turn ratio of the injection transformer is determined by analyzing the four working modes, so that the output voltage of the isolation transformer is modulated, the purpose of inhibiting input current harmonics is achieved, the electric energy quality of the input current is improved, and the total distortion rate of the current harmonics is obviously reduced.
Drawings
FIG. 1 is a circuit diagram of a series 36-pulse rectifier and method using DC side voltage injection according to the present invention.
Fig. 2 is a winding structure diagram of the isolation transformer of the present invention.
Fig. 3 is a diagram of a first set of injection transformer windings.
Fig. 4 is a diagram of a second set of injection transformer windings.
Fig. 5 is a circuit diagram of an operating mode I of the harmonic injection circuit.
Fig. 6 is a circuit diagram of the operation mode ii of the harmonic injection circuit.
Fig. 7 is a circuit diagram of an operating mode iii of the harmonic injection circuit.
Fig. 8 is a circuit diagram of an operating mode iv of the harmonic injection circuit.
In FIGS. 1 to 8, usa、usb、uscIs a three-phase alternating current voltage source; i.e. ia、ib、icThree-phase input current; i.e. i1、i2、i3Inputting winding current for the isolation transformer; i.e. ia3、ib3、ic3The input current of the first group of three-phase full-bridge rectifying circuits; i.e. ia1、ib1、 ic1Is input power of a second group of three-phase full-bridge rectification circuitsA stream; i.e. ia5、ib5、ic5The input current of the third group of three-phase full-bridge rectifying circuits; i.e. iRec1Is the output current of the first set of three-phase full-bridge rectification circuits; i.e. iRec2Is the output current of the second three-phase full-bridge rectification circuit; i.e. iRec3Is the output current of the third group of three-phase full-bridge rectification circuits; i.e. ix1Injecting a primary winding current of the transformer for the first group; i.e. ix1Injecting a primary winding current of the transformer for the second group; i.e. iD1、iD2Injecting the secondary winding current of the transformer for the first group, and also inputting the current of the single-phase full-wave rectifying circuit for the first group; i.e. iD3、iD4Injecting secondary winding current of the transformer for the second group, and inputting current of the single-phase full-wave rectification circuit for the second group; u. ofoIs the load voltage; n is a radical of1The number of turns of a primary winding of the isolation transformer is set; n is a radical of2The number of turns of a secondary side star-shaped connection winding is connected with the second group of three-phase full-bridge rectifying circuits for the isolation transformer; n is a radical of3、N4The number of turns of a secondary side star-shaped connection winding is connected with the first group of three-phase full-bridge rectifying circuits for the isolation transformer; n is a radical of5、N6The number of turns of a secondary side star-shaped connection winding is connected with a third group of three-phase full-bridge rectifying circuits for the isolation transformer; n is a radical of7Two groups of injection transformers are provided with primary winding turns; n is a radical of8Two groups of secondary windings of the injection transformer have turns; d1、D2Two diodes respectively of a first group of single-phase full-wave rectification circuits; d3、D4Two diodes of the second single-phase full-wave rectification circuit.
Reference numeral in the figure, 1 is an input inductance; 2 is an isolation transformer; 3 is a first group of three-phase full-bridge rectifying circuits; 4 is a second group of three-phase full-bridge rectifying circuits; 5 is a third group of three-phase full-bridge rectifying circuits; 6 is a direct current side capacitor; 7 is a load; 8 is a first group injection transformer; 9 is a second set of injection transformers; 10 is a first group of single-phase full-wave rectifying circuits; 11 is a second group of single-phase full-wave rectifying circuits; 2-1 is a core column I; 2-2 is a core column II; 2-3 is stem III.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
The first embodiment is as follows: as shown in fig. 1 to 8, the series type 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment includes an input inductor, an isolation transformer, a first three-phase full-bridge rectifier circuit, a second three-phase full-bridge rectifier circuit, a third three-phase full-bridge rectifier circuit, a dc-side capacitor, a load, a first injection transformer, a second injection transformer, a first single-phase full-wave rectifier circuit, and a second single-phase full-wave rectifier circuit; the three-phase alternating current voltage source is connected with the left side of the input inductor in series, and the right side of the input inductor is connected with the primary winding of the isolation transformer; the isolation transformer is used as a phase-shifting transformer, the primary windings of the isolation transformer are connected in a triangular mode, five secondary windings of the isolation transformer are mutually independent and form three groups of star-shaped connections, and the isolation transformer outputs three groups of three-phase voltages with the phase difference of 20 degrees; the input ends of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits are respectively connected with the output ends a1, b1, c1, a2, b2, c2, a3, b3 and c3 of the isolation transformer, and the output ends of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits are connected in series, namely the output voltage; the direct current side capacitor is formed by connecting three same capacitors in series, the upper end of the direct current side capacitor is connected with the positive electrode of the output end of the first group of three-phase full-bridge rectification circuits and the positive electrode of the load, and the lower end of the direct current side capacitor is connected with the negative electrode of the output end of the third group of three-phase full-bridge rectification circuits and the negative electrode of the load; the left input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a connection point F, S of the first group of three-phase full-bridge rectifying circuits, the second group of three-phase full-bridge rectifying circuits and the third group of three-phase full-bridge rectifying circuits, the right input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a connection point P, T of a direct-current side capacitor, and secondary windings of the first group of injection transformers and the second group of injection transformers are provided with center taps; the input ends of the first group of single-phase full-wave rectifying circuits and the second group of single-phase full-wave rectifying circuits are respectively connected with the secondary sides of the two groups of injection transformers, the output ends of the first group of single-phase full-wave rectifying circuits are respectively connected to the upper end of a capacitor C1 in the direct-current side capacitor and the lower end of a capacitor C2, and the output ends of the second group of single-phase full-wave rectifying circuits are respectively connected to the upper end of a capacitor C2 in the direct-current side capacitor.
In the series 36-pulse rectifier using the dc side voltage injection method according to the present embodiment, the passive harmonic injection circuit is added to the dc side of the rectifier to change the output voltages of the two sets of rectifier bridges, thereby modulating the input voltage of the isolation transformer to approximate a sine wave, and achieving the effect of suppressing the input current harmonics.
Example two: as shown in fig. 1, in the serial 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, the input inductor is composed of three identical inductors respectively connected to three-phase ac voltage source usa、usb、uscThe three capacitors are connected in series to form an equivalent current source, and the direct-current side capacitor is formed by connecting three capacitors in series.
In the series 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, the input power source is equivalent to a current source, and the load is equivalent to a constant-voltage load.
Example three: as shown in fig. 1 and 2, the series 36-pulse rectifier using dc side voltage injection method according to this embodiment includes three core columns, each of which includes 6 windings, a primary winding and five secondary windings, and the turn ratio of the six windings is equal toThe primary windings a, b and c are connected in a delta mode, the windings a2, b2, c2, a3, b3 and c3 are secondary windings connected in a first star mode, the windings a1, b1 and c1 are secondary windings connected in a second star mode, and the windings a4, b4, c4, a5, b5 and c5 are secondary windings connected in a third star mode; the windings a, a1, a2, a3, a4 and a5 are positioned on the same core column, and the windings areb. b1, b2, b3, b4 and b5 are located on the same core column, and windings c, c1, c2, c3, c4 and c5 are located on the same core column.
The isolation transformer consists of three core columns, each core column is provided with 6 windings, a primary winding and five secondary windings, and the turn ratio of the six windings is
The primary windings a, b and c are connected in a triangular mode and can provide a loop for triple frequency harmonics, the windings a2, b2, c2, a3, b3 and c3 are a first group of star-connected secondary windings, the windings a1, b1 and c1 are a second group of star-connected secondary windings, and the windings a4, b4, c4, a5, b5 and c5 are a third group of star-connected secondary windings; the windings a, a1, a2, a3, a4 and a5 are located on the same core column, the windings b, b1, b2, b3, b4 and b5 are located on the same core column, and the windings c, c1, c2, c3, c4 and c5 are located on the same core column; the isolation transformer has a symmetrical structure, has a certain inhibiting effect on characteristic subharmonics, and is higher in safety when being used in certain occasions with large difference between input and output voltage levels.
Example four: as shown in fig. 1, in the series-type 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, diodes are used as the rectifying devices in the first, second, and third sets of three-phase full-bridge rectifier circuits.
The three groups of rectifying circuits use diodes as rectifying devices, so that the realization difficulty is low and the reliability is high; when any group of rectifier bridges are in fault, the rectifier can continuously work in a 24-pulse rectification state, and the fault tolerance is high; three groups of rectifying circuits are connected in series, so that the problem of current imbalance is solved, the output voltage is increased, and the high-power rectifying circuit is suitable for high-power rectifying occasions outputting high voltage.
Example five: as shown in fig. 1, in the series-type 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, the output currents of the first, second, and third groups of three-phase full-bridge rectifier circuits are 6-pulse currents having the same average value and a phase difference of 20 °.
Example six: as shown in fig. 1, 3 and 4, in the series-type 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, the first injection transformer and the second injection transformer are single-phase transformers.
The first group of injection transformers and the second group of injection transformers are single-phase transformers, and are simple in structure and low in no-load loss. The left sides of the input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a connecting point F, S of the three groups of rectifier bridges, the right sides of the input ends of the first group of injection transformers and the second group of injection transformers are respectively connected to a point P and a point T of a direct-current side capacitor, secondary windings of the first group of injection transformers and the second group of injection transformers are provided with center taps and are respectively connected to the input ends of the two groups of single-phase full-wave rectifier circuits, and the injection transformers and the single-phase full-wave rectifier circuits jointly form a.
Example seven: as shown in fig. 1, in the series-type 36-pulse rectifier using the dc-side voltage injection method according to the present embodiment, the first group of single-phase full-wave rectification circuits and the second group of single-phase full-wave rectification circuits are formed by two diodes.
The first group of single-phase full-wave rectifying circuits and the second group of single-phase full-wave rectifying circuits are used as harmonic injection circuits, only two diodes are used, loss is small, the harmonic injection circuits work in a low-voltage occasion, and the defect that the diodes of the single-phase full-wave rectifying circuits bear large voltage can be ignored.
Example eight: the following describes a specific method for forming 36 pulses by using a series-type 36-pulse rectifier using a dc-side voltage injection method according to this embodiment with reference to fig. 1, 5, 6, 7, and 8:
the DC side harmonic suppression method is applied to a series type 18-pulse rectifier to form a series type 36-pulse rectifier. The harmonic injection circuit consists of an injection transformer and a single-phase full-wave rectification circuit, and the output current of a first group of three-phase full-bridge rectification circuits is iRec1The output current of the second three-phase full-bridge rectification circuit group is iRec2The output current of the third group of three-phase full-bridge rectification circuits is iRec3By usingiRec1、iRec2And iRec3The principle of phase difference of 20 degrees generates injection harmonic waves; when i isRec1<iRec2， iRec2<iRec3At this time, the two sets of harmonic injection circuits are in the working mode I, and when i is shown in the figure 5x1>0，ix2>0, current flows into the same-name ends of two groups of primary windings of the injection transformer, and a diode D in the first group of single-phase full-wave rectification circuits1Conducting, diode D2Turn off, diode D in the second set of single-phase full-wave rectification circuits3Conducting, diode D4Turn off, when the primary side of the two injection transformers generates a voltage of
The injection voltage of (a); when i isRec1<iRec2，iRec2>iRec3When the first group of harmonic injection circuits is in working mode I and the second group of harmonic injection circuits is in working mode II, in combination with FIG. 6, ix1>0，ix2<0, current flows into the same-name end of the primary winding of the first group of injection transformers and flows out of the same-name end of the primary winding of the second group of injection transformers, and a diode D in the single-phase full-wave rectification circuit of the first group1Conducting, diode D2Turn off, diode D in the second set of single-phase full-wave rectification circuits3Turn-off, diode D4Is conducted, and the primary side of the first group of injection transformers generates the voltage of
Of a magnitude generated on the primary side of a second group of injection transformers
The injection voltage of (a); when i isRec1>iRec2，iRec2<iRec3When the first group of harmonic injection circuits is in the working mode II and the second group of harmonic injection circuits is in the working mode I, in combination with FIG. 7, ix1<0，ix2>0, current flowing out of the first group is injected into the same name of the primary winding of the transformerA terminal, a diode D in the first single-phase full-wave rectification circuit, and a second injection transformer1Turn-off, diode D2On, diode D in the second group of single-phase full-wave rectification circuits3Conducting, diode D4Turn off when the primary side of the first injection transformer is at a value of
Of a magnitude generated on the primary side of a second group of injection transformers
The injection voltage of (a); when i isRec1<iRec2，iRec2<iRec3At this time, the two sets of harmonic injection circuits are in the working mode I, and when i is shown in the combined figure 8x1<0，ix2<0, current flows out of two groups of diodes which are injected into the same name end of the primary winding of the transformer, and a diode D in the first group of single-phase full-wave rectification circuits1Turn-off, diode D2On, diode D in the second group of single-phase full-wave rectification circuits3Turn-off, diode D4Is conducted, and the primary side of the two groups of injection transformers generates the voltage of
The injection voltage of (a); the primary sides of the two groups of injection transformers can generate square wave voltage with 6 times of grid voltage frequency, the phase difference is 30 degrees, and the input voltage (u) of the primary sides of the isolation transformers is injected due to the square wave voltageAN、uBN、uCN) For 36 pulses, the current (i) is inputa、ib、ic) The waveform of (a) is approximately sinusoidal.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The series-connection type 36-pulse rectifier using the direct-current side voltage injection method is characterized by comprising an input inductor (1), an isolation transformer (2), a first group of three-phase full-bridge rectification circuits (3), a second group of three-phase full-bridge rectification circuits (4), a third group of three-phase full-bridge rectification circuits (5), a direct-current side capacitor (6), a load (7), a first group of injection transformers (8), a second group of injection transformers (9), a first group of single-phase full-wave rectification circuits (10) and a second group of single-phase full-wave rectification circuits (11); the three-phase alternating current voltage source is connected with the left side of the input inductor (1) in series, and the right side of the input inductor (1) is connected with the primary winding of the isolation transformer (2); the isolation transformer (2) is used as a phase-shifting transformer, the primary windings of the isolation transformer (2) are connected in a triangular mode, five secondary windings of the isolation transformer (2) are mutually independent and form three groups of star-shaped connections, and the isolation transformer (2) outputs three groups of three-phase voltages with the phase difference of 20 degrees; the input ends of the first group of three-phase full-bridge rectifying circuits (3), the second group of three-phase full-bridge rectifying circuits (4) and the third group of three-phase full-bridge rectifying circuits (5) are respectively connected with the first group of star-connected output ends a3, b3 and c3 of the secondary winding of the isolation transformer (2), the second group of star-connected output ends a1, b1 and c1 of the secondary winding of the isolation transformer (2) and the third group of star-connected output ends a5, b5 and c5 of the secondary winding of the isolation transformer (2), and the output ends of the first group of three-phase full-bridge rectifying circuits (3), the second group of three-phase full-bridge rectifying circuits (4) and the third group of three-phase full-bridge rectifying circuits (5) are connected; the direct current side capacitor (6) is formed by connecting three same capacitors in series, the upper end of the direct current side capacitor (6) is connected with the positive electrode of the output end of the first group of three-phase full-bridge rectification circuit (3) and the positive electrode of the load (7), and the lower end of the direct current side capacitor (6) is connected with the negative electrode of the output end of the third group of three-phase full-bridge rectification circuit (5) and the negative electrode of the load (7); the left input ends of the first group of injection transformers (8) and the second group of injection transformers (9) are respectively connected to the connection point F, S of the first group of three-phase full-bridge rectification circuit (3), the second group of three-phase full-bridge rectification circuit (4) and the third group of three-phase full-bridge rectification circuit (5), the right input ends of the first group of injection transformers (8) and the second group of injection transformers (9) are respectively connected to the connection point P, T of the direct-current side capacitor (6), and secondary windings of the first group of injection transformers (8) and the second group of injection transformers (9) are provided with center taps; the input ends of a first group of single-phase full-wave rectifying circuits (10) and a second group of single-phase full-wave rectifying circuits (11) are respectively connected with the secondary sides of the two groups of injection transformers, the output end of the first group of single-phase full-wave rectifying circuits (10) is respectively connected to the upper end of a capacitor C1 and the lower end of a capacitor C2 in the direct-current side capacitor (6), and the output end of the second group of single-phase full-wave rectifying circuits (11) is respectively connected to the upper end of a capacitor C2 and the lower end of a capacitor C3 in the direct;
the point F is a connection point on a series connection line of the first group of three-phase full-bridge rectification circuit and the second group of full-bridge rectification circuit, the point S is a connection point on a series connection line of the second group of three-phase full-bridge rectification circuit and the third group of full-bridge rectification circuit, the point P is a connection point on a connection line of the direct-current side capacitors C1 and C2, and the point T is a connection point on a connection line of the direct-current side capacitors C2 and C3;
the first group of three-phase full-bridge rectifying circuits (3), the second group of three-phase full-bridge rectifying circuits (4) and the third group of three-phase full-bridge rectifying circuits (5) all adopt diodes as rectifying devices; the output currents of the first group of three-phase full-bridge rectifying circuit (3), the second group of three-phase full-bridge rectifying circuit (4) and the third group of three-phase full-bridge rectifying circuit (5) are 6 pulse wave currents with the same average value and 20-degree phase difference; when any group of rectifier bridges fails, the rectifier can continue to work in a 24-pulse rectification state.
2. The series type 36-pulse rectifier using the dc-side voltage injection method according to claim 1, wherein the input inductor (1) is composed of three identical inductors, the three inductors are respectively connected in series with three-phase ac voltage sources usa, usb, and usc to form an equivalent current source, and the dc-side capacitor (6) is composed of three capacitors connected in series.
3. The series type 36-pulse rectifier using the dc-side voltage injection method according to claim 1, wherein the isolation transformer (2) is composed of three legs, each leg having 6 windings, one primary winding and five secondary windings, the turn ratio of the six windings is that the primary windings a, b, c are connected in a delta, the windings a2, b2, c2, a3, b3, c3 are secondary windings of a first group of star connections, the windings a1, b1, c1 are secondary windings of a second group of star connections, the windings a4, b4, c4, a5, b5, c5 are secondary windings of a third group of star connections; the windings a, a1, a2, a3, a4 and a5 are located on the same core column, the windings b, b1, b2, b3, b4 and b5 are located on the same core column, and the windings c, c1, c2, c3, c4 and c5 are located on the same core column.
4. The series type 36-pulse rectifier using DC-side voltage injection method according to claim 1, wherein the first and second injection transformers (8, 9) are single-phase transformers.
5. The series-type 36-pulse rectifier using the dc-side voltage injection method according to claim 1, wherein the first group of single-phase full-wave rectifier circuits (10) and the second group of single-phase full-wave rectifier circuits (11) are formed of two diodes.
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| CN111786581B (en) * | 2020-07-23 | 2022-08-30 | 哈尔滨工业大学（威海） | Series 60-pulse rectifier using DC side mixed harmonic suppression method |
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| CN113300619B (en) * | 2021-05-31 | 2022-05-17 | 哈尔滨工程大学 | Series 24-pulse rectifier with auxiliary passive pulse multiplying circuit |
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| CN108631614A (en) * | 2018-05-02 | 2018-10-09 | 哈尔滨工业大学（威海） | Use 24 Pulses Rectifier of tandem type of DC voltage injection method |
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| CN108631614A (en) * | 2018-05-02 | 2018-10-09 | 哈尔滨工业大学（威海） | Use 24 Pulses Rectifier of tandem type of DC voltage injection method |
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