CN215815555U - Multiphase autotransformer and rectifier system - Google Patents
Multiphase autotransformer and rectifier system Download PDFInfo
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- CN215815555U CN215815555U CN202120317865.6U CN202120317865U CN215815555U CN 215815555 U CN215815555 U CN 215815555U CN 202120317865 U CN202120317865 U CN 202120317865U CN 215815555 U CN215815555 U CN 215815555U
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Abstract
The utility model relates to a multiphase autotransformer and a rectifier system. The multiphase autotransformer comprises a first iron core column, a second iron core column and a third iron core column, wherein the first iron core column, the second iron core column and the third iron core column are respectively provided with a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, the design and the structural layout of specific windings are adopted, the input three-phase line voltages can be converted into three groups of three-phase voltage voltages, nine-phase line voltage output is formed between the specific phase voltages together, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the working performance of the transformer is improved, the additional reactive power compensation and harmonic treatment cost is reduced, particularly, the multiphase autotransformer is designed according to the boosting function, the voltage of an output end is greater than that of an input end, and the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like can be met, the use cost is low, and the reliability is high.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a multiphase autotransformer and a rectifier system.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and main components comprise a coil and an iron core, and the transformer has the following main functions: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization, and the like. The multiphase self-coupling phase-shifting rectifier transformer is one of transformers, is a core component for realizing power frequency AC-DC rectification, is widely applied to medium and high power frequency converter systems, and has the advantages of strong adaptability to commercial power supply environment, strong load impact resistance, high reliability and the like.
The traditional power frequency AC-DC rectification adopts 3-phase 6-pulse wave power frequency AC-DC rectification, and a core component of the traditional power frequency AC-DC rectification adopts a three-phase transformer, but the method has low power factor, can generate larger input current harmonic wave, exceeds the limit requirements of reactive power and harmonic wave of a power grid for industrial application, has large influence on the power grid, and generates serious harmonic wave interference on other electrical equipment. In the medium and high power application, higher-cost reactive compensation and harmonic treatment equipment is required, the additional cost is high, and the reliability is low.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a multiphase autotransformer and a rectifier system for solving the problems of the conventional power frequency AC-DC rectification method.
A multiphase autotransformer comprises a first iron core column, a second iron core column and a third iron core column, wherein a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding are arranged on the first iron core column, the second iron core column and the third iron core column respectively;
a first end of a first winding on the first core limb is connected with a first end of a fourth winding on the second core limb, a first end of the first winding on the second core limb is connected with a first end of the fourth winding on the third core limb, and a first end of the first winding on the third core limb is connected with a first end of the fourth winding on the first core limb;
a second end of a fifth winding on the first core leg is connected to a second end of a third winding on the second core leg, a second end of the fifth winding on the second core leg is connected to a second end of the third winding on the third core leg, and a second end of the fifth winding on the third core leg is connected to a second end of the third winding on the first core leg;
a second end of a fourth winding on the first core limb and a first end of a fifth winding on the first core limb are both connected with a first end of a sixth winding on the third core limb, a second end of the fourth winding on the third core limb and a first end of the fifth winding on the third core limb are both connected with a first end of the sixth winding on the second core limb, and a second end of the fourth winding on the second core limb and a first end of the fifth winding on the second core limb are both connected with a first end of the sixth winding on the first core limb;
a second end of a second winding on the second core leg is connected to a first end of a third winding on the second core leg, a second end of the second winding on the third core leg is connected to a first end of the third winding on the third core leg, and a second end of the second winding on the first core leg is connected to a first end of the third winding on the first core leg;
a second end of the first winding on the third core column is connected with a first end of the second winding on the third core column, a second end of the first winding on the first core column is connected with a first end of the second winding on the first core column, and a second end of the first winding on the second core column is connected with a first end of the second winding on the second core column;
the input end of the multi-phase autotransformer comprises a second end of a sixth winding on the first iron core column, a second end of a sixth winding on the second iron core column and a second end of the sixth winding on the third iron core column, and the output end of the multi-phase autotransformer comprises a common connecting end of a fourth winding and a fifth winding on each iron core column, a common connecting end of a second winding and a third winding on each iron core column and a common connecting end of a first winding and a second winding on each iron core column.
A rectifier system comprising a multiphase autotransformer as described above and a full wave rectifier bridge connected to an output of the multiphase autotransformer.
The multi-phase autotransformer and rectifier system adopts specific winding design and structural layout, the transformer is provided with three input ends, nine output ends, the input three-phase line voltage can be converted into three groups of three-phase line voltage, nine-phase line voltage output is formed between specific phase voltages, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the working performance of the transformer is improved, the additional reactive compensation and harmonic treatment cost is reduced, particularly, the multiphase autotransformer is designed according to the boosting function, the voltage at the output end is greater than that at the input end, the direct high-voltage power frequency AC-DC rectification circuit can meet the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like, and is low in use cost and high in reliability.
In one embodiment, the winding directions of the windings on the first core limb are the same, the winding directions of the windings on the second core limb are the same, and the winding directions of the windings on the third core limb are the same.
In one embodiment, the output end of the multi-phase autotransformer includes a main boost three-phase voltage output end, an advance phase three-phase voltage output end and a lag phase three-phase voltage output end, the main boost three-phase voltage output end includes a common connection end of a fourth winding and a fifth winding on the first core limb, a common connection end of the fourth winding and the fifth winding on the second core limb, and a common connection end of the fourth winding and the fifth winding on the third core limb, the advance phase three-phase voltage output end includes a common connection end of a second winding and a third winding on the first core limb, a common connection end of a second winding and a third winding on the second core limb, and a common connection end of the second winding and the third winding on the third core limb, and the lag phase voltage output end includes a common connection end of a first winding and a second winding on the first core limb, and a lag phase voltage output end, And the common connecting end of the first winding and the second winding on the second iron core column and the common connecting end of the first winding and the second winding on the third iron core column.
In one embodiment, the voltage vector output by the leading phase three-phase voltage output end is ahead of the voltage vector output by the main boosting three-phase voltage output end, and the voltage vector output by the lagging phase three-phase voltage output end is lagging behind the voltage vector output by the main boosting three-phase voltage output end.
In one embodiment, the common connection end of the fourth winding and the fifth winding on the first core limb outputs a voltage vector of
The voltage vector output by the common connection end of the fourth winding and the fifth winding on the second iron core column is
The voltage vector output by the common connecting end of the fourth winding and the fifth winding on the third iron core column is
The voltage vector output by the common connection end of the second winding and the third winding on the first iron core column is
The voltage vector output by the common connection end of the second winding and the third winding on the second iron core column is
The voltage vector output by the common connecting end of the second winding and the third winding on the third iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the first iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the second iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the third iron core column is
Vector of line voltage difference
And
are equal in magnitude.
In one embodiment, the line voltage difference vector
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
In one embodiment, the number of turns of the corresponding windings on the first core leg, the second core leg and the third core leg is equal.
In one embodiment, the first winding and the third winding on each core leg have the same number of turns, and the fourth winding and the fifth winding on each core leg have the same number of turns.
In one embodiment, the full-wave rectifier bridge comprises nine rectifier diode bridge arms, one output end of the multiphase autotransformer is correspondingly connected with an alternating current input node of one rectifier diode bridge arm, a common connection end of a direct current side anode of each rectifier diode bridge arm forms a load anode connection end, and a common connection end of a direct current side cathode of each rectifier diode bridge arm forms a load cathode connection end.
Drawings
FIG. 1 is a schematic diagram of a multi-phase autotransformer in one embodiment;
FIG. 2 is a block diagram of a multi-phase autotransformer in one embodiment;
FIG. 3 is a schematic diagram of the operation of a multi-phase autotransformer in one embodiment;
FIG. 4 is a schematic diagram of a rectifier system in one embodiment;
FIG. 5 is a block diagram of a rectifier system in one embodiment;
fig. 6 is a schematic of input current and output voltage waveforms for a rectifier system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described more fully below by way of examples in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, referring to fig. 1, a multiphase autotransformer is provided, which includes a first core limb 21, a second core limb 22 and a third core limb 23, and a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding are disposed on each of the first core limb 21, the second core limb 22 and the third core limb 23. Referring to fig. 2, a first end of the first winding 311 on the first core leg 21 is connected to a first end of the fourth winding 324 on the second core leg 22, a first end of the first winding 321 on the second core leg 22 is connected to a first end of the fourth winding 334 on the third core leg 23, and a first end of the first winding 331 on the third core leg 23 is connected to a first end of the fourth winding 314 on the first core leg 21. A second end of the fifth winding 315 on the first core leg 21 is connected to a second end of the third winding 323 on the second core leg 22, a second end of the fifth winding 325 on the second core leg 22 is connected to a second end of the third winding 333 on the third core leg 23, and a second end of the fifth winding 335 on the third core leg 23 is connected to a second end of the third winding 313 on the first core leg 21.
The second end of the fourth winding 314 on the first core leg 21 and the first end of the fifth winding 315 on the first core leg 21 are both connected to the first end of the sixth winding 336 on the third core leg 23, the second end of the fourth winding 334 on the third core leg 23 and the first end of the fifth winding 335 on the third core leg 23 are both connected to the first end of the sixth winding 326 on the second core leg 22, and the second end of the fourth winding 324 on the second core leg 22 and the first end of the fifth winding 325 on the second core leg 22 are both connected to the first end of the sixth winding 316 on the first core leg 21. The second end of the second winding 322 on the second core leg 22 is connected to the first end of the third winding 323 on the second core leg 22, the second end of the second winding 332 on the third core leg 23 is connected to the first end of the third winding 333 on the third core leg 23, and the second end of the second winding 312 on the first core leg 21 is connected to the first end of the third winding 313 on the first core leg 21. The second end of the first winding 331 on the third core leg 23 is connected to the first end of the second winding 332 on the third core leg 23, the second end of the first winding 311 on the first core leg 21 is connected to the first end of the second winding 312 on the first core leg 21, and the second end of the first winding 321 on the second core leg 22 is connected to the first end of the second winding 322 on the second core leg 22.
The input end of the multi-phase autotransformer comprises the second end of the sixth winding 316 on the first core limb 21, the second end of the sixth winding 326 on the second core limb 22 and the second end of the sixth winding 336 on the third core limb 23, and the output end of the multi-phase autotransformer comprises the common connection end of the fourth winding and the fifth winding on each core limb, the common connection end of the second winding and the third winding on each core limb and the common connection end of the first winding and the second winding on each core limb.
Specifically, the multiphase autotransformer in the embodiment is a core component for realizing power frequency AC-DC rectification, and can be applied to a high-power high-voltage inverter system such as a medium-high power brushless doubly-fed motor variable frequency speed control system. The multiphase autotransformer comprises a first iron core column 21, a first winding 311, a second winding 312, a third winding 313, a fourth winding 314, a fifth winding 315 and a sixth winding 316 which are arranged on the first iron core column 21, a second iron core column 22, a first winding 321, a second winding 322, a third winding 323, a fourth winding 324, a fifth winding 325 and a sixth winding 326 which are arranged on the second iron core column 22, a third iron core column 23, and a first winding 331, a second winding 332, a third winding 333, a fourth winding 334, a fifth winding 335 and a sixth winding 336 which are arranged on the third iron core column 23. Furthermore, the first winding, the second winding, the third winding, the fourth winding, the fifth winding and the sixth winding are arranged at corresponding positions on each iron core column, and the windings arranged at the corresponding positions on each iron core column adopt corresponding winding serial numbers, so that the transformer structure is convenient to identify. In addition, the multi-phase autotransformer further comprises an upper yoke 11 and a lower yoke 12, wherein one end of the first limb 21, the second limb 22 and the third limb 23 is connected to the upper yoke 11, and the other end is connected to the lower yoke 12. The first core limb 21, the second core limb 22, the third core limb 23, the upper yoke 11 and the lower yoke 12 may be made of silicon steel sheets of the same material to ensure that the magnetic circuit works normally.
The number of the input ends of the multi-phase autotransformer is three, and when the number of the output ends of the multi-phase autotransformer is nine, the multi-phase autotransformer can be connected with power frequency three-phase voltage to output power frequency nine-phase voltage, and at the moment, the multi-phase autotransformer is a nine-phase autotransformer. The multiphase autotransformer adopts specific winding design and structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized to enable the transformer to have three input ends and nine output ends, the three-phase line voltage input can be converted into three-phase line voltage groups, specific nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the total harmonic content of input current is reduced, the power factor and the working performance of the transformer are improved, and the harmonic treatment cost is reduced.
In one embodiment, the winding direction of each winding on the first core limb 21 is the same, the winding direction of each winding on the second core limb 22 is the same, and the winding direction of each winding on the third core limb 23 is the same.
Specifically, referring to fig. 1-2, the first ends of the windings on the core legs are respectively used as the heads of the windings, and the second ends of the windings on the core legs are respectively used as the tails of the windings. The winding direction of the winding refers to the winding direction of the winding on the corresponding core limb. The winding directions of the windings on the first core limb 21 are the same, the heads (terminals with black dot marks) of the windings are the same ends, and the tails (terminals without black dot marks) of the windings are the same ends. The winding directions of the windings on the second core limb 22 are also the same, the heads (terminals with black dot marks) of the windings are homonymous terminals, and the tails (terminals without black dot marks) of the windings are homonymous terminals. The winding directions of the windings on the third core column 23 are the same, the heads (terminals with black dot marks) of the windings are the same ends, and the tails (terminals without black dot marks) of the windings are the same ends. Further, the winding direction of each winding on the first core leg 21, the winding direction of each winding on the second core leg 22, and the winding direction of each winding on the third core leg 23 are respectively the same, for example, the winding directions of the first winding 311 on the first core leg 21, the first winding on the second core leg 22, and the first winding 331 on the third core leg 23 are the same.
In one embodiment, referring to fig. 2-3, the output terminals of the multi-phase autotransformer include a main boost three-phase voltage output terminal, a leading-phase three-phase voltage output terminal and a lagging-phase three-phase voltage output terminal, the main boost three-phase voltage output terminal includes a common connection terminal of the fourth winding 314 and the fifth winding 315 on the first core limb 21, a common connection terminal of the fourth winding 324 and the fifth winding 325 on the second core limb 22, and a common connection terminal of the fourth winding 334 and the fifth winding 335 on the third core limb 23, the leading-phase three-phase voltage output terminal includes a common connection terminal of the second winding 312 and the third winding 312 on the first core limb 21, a common connection terminal of the second winding 322 and the third winding 323 on the second core limb 22, and a common connection terminal of the second winding 332 and the third winding 333 on the third core limb 23, and the lagging-phase voltage output terminal includes a common connection terminal of the first winding 311 and the second winding 312 on the first core limb 21, The common connection of the first winding 321 and the second winding 322 on the second core leg 22 and the common connection of the first winding 331 and the second winding 332 on the third core leg 23.
Specifically, referring to fig. 2-3, the nodes (a, B, C) are power frequency three-phase voltage input terminals corresponding to vectors
The three-phase voltage vector is a power frequency three-phase input phase voltage vector, namely the three-input-end voltage vector of the multi-phase autotransformer. Node (A)0，B0，C0) Corresponding vector for power frequency three-phase main boost phase output end, namely main boost three-phase voltage output end
The phase voltage vector is a power frequency three-phase main boost phase. Node (A)1，B1，C1) Corresponding vector for power frequency three-phase leading-phase output end, i.e. leading-phase three-phase voltage output end
The power frequency three-phase leading phase voltage vector is obtained. Node (A)2，B2，C2) Corresponding vectors for power frequency three-phase lagging phase output ends, namely lagging phase three-phase voltage output ends
The power frequency three-phase lagging phase voltage vector is obtained. Input power frequency three-phase voltage (A-B-C) is respectively input from a tail connecting point of a sixth winding on each iron core column, output main boosting phase three-phase voltage (A0-B0-C0) is respectively output from a head connecting point of the sixth winding on each iron core column, leading phase three-phase voltage (A1-B1-C1) is respectively output from a connecting point of a second winding and a third winding on each iron core column, and lagging phase three-phase voltage (A2-B2-C2) is respectively output from a connecting point of the first winding and the second winding on each iron core column.
In one embodiment, the voltage vector output by the leading phase three-phase voltage output terminal is ahead of the voltage vector output by the main boosting three-phase voltage output terminal, and the voltage vector output by the lagging phase three-phase voltage output terminal is lagging behind the voltage vector output by the main boosting three-phase voltage output terminal.
Specifically, the voltage vector output by the leading phase three-phase voltage output end is ahead of the voltage vector output by the main boosting three-phase voltage output end, and the voltage vector output by the leading phase three-phase voltage output end is the voltage vector output by the leading phase three-phase voltage output end
Respectively ahead of the voltage vectors output by the main boost three-phase voltage output terminal
Phase angle certain angle, lag phase three-phase voltage output endThe voltage vector lags behind the voltage vector output by the main boosting three-phase voltage output end, which means the voltage vector output by the lagging phase three-phase voltage output end
Voltage vectors respectively lagging behind output ends of main boosting three-phase voltage
The phase angle, lead and lag are 37 degrees.
In one embodiment, referring to fig. 2-3, the voltage vector output from the common connection end of the fourth winding 314 and the fifth winding 315 on the first core limb 21 is
The voltage vector output from the common connection end of the fourth winding 324 and the fifth winding 325 on the second core limb 22 is
The voltage vector output by the common connection end of the fourth winding 334 and the fifth winding 335 on the third core column 23 is
The voltage vector output from the common connection end of the second winding 312 and the third winding 313 on the first core limb 21 is
The voltage vector output from the common connection end of the second winding 322 and the third winding 323 on the second core limb 22 is
The voltage vector output by the common connecting end of the second winding 332 and the third winding 333 on the third core column 23 is
The voltage vector output from the common connection end of the first winding 311 and the second winding 312 of the first core limb 21 is
The voltage vector output from the common connection end of the first winding 321 and the second winding 322 on the second core limb 22 is
The voltage vector output by the common connection end of the first winding 331 and the second winding 332 on the third core column 23 is
Vector of line voltage difference
And
are equal in magnitude.
When the following nine line voltage difference vectors
When the output ends of the three output ends of the multiphase autotransformer are respectively connected with one rectifying diode bridge arm, the output ends of the three rectifying diode bridge arms can be directly connected in parallel, the anodes of all the rectifying diode bridge arms form a common connecting end used for being connected with the anode of the rectifying load, and the cathodes of all the diode bridge arms form a common connecting end used for being connected with the cathode of the rectifying load. The voltage output by the multiphase autotransformer does not need to be externally connected with a balance reactor after rectification, the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like can be met, the use cost and the occupied volume of equipment are reduced, and the use convenience is improved.
In one embodiment, the line voltage difference vector
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
Current line voltage difference vector
And the inverted vectors thereof, when vector distribution at intervals of 20 degrees is formed in a range of 360 degrees, if nine output ends of the multiphase autotransformer are respectively connected with one rectifier diode bridge arm, the outputs of all the rectifier diode bridge arms can be connected in parallel to realize 18 pulse wave ripples. Further, on the basis, a 'main boost phase' phase voltage vector is set
Are respectively three-phase input phase voltage vectors
K times (K)>1) The phase voltage amplitudes of the three-phase input (A, B, C) are all VPThe three-phase main boost output (A)0，B0，C0) The phase voltage amplitudes are all K.VPThereby obtaining the voltage vector of each leading phase
The amplitude values of (A) are all 0.767. K. VPThe phase of the corresponding leading main vector is about 37 degrees; voltage vector of each lagging phase
The amplitude of (A) is also 0.767. K. VPThe corresponding lag dominant vector phase is about 37 degrees.
In one embodiment the number of turns of the corresponding windings on the first core leg 21, the second core leg 22 and the third core leg 23 is equal. When the number of turns of the corresponding windings on the first iron core column 21, the second iron core column 22, and the third iron core column 23 is equal, it is beneficial to improve the amplitude of the output voltage of the multi-phase autotransformer and the symmetry of the phase, specifically, the number of turns of the corresponding windings on the first iron core column 21, the second iron core column 22, and the third iron core column 23 is equal, which means that the number of turns of the corresponding windings on the first iron core column 21, the second iron core column 22, and the third iron core column 23 is equal, for example, the number of turns of the first winding on the first iron core column 21, the first winding on the second iron core column 22, and the first winding on the third iron core column 23 is equal, the number of turns of the second winding on the first iron core column 21, the second winding on the second iron core column 22, and the second winding on the third iron core column 23 are equal, and the number of turns of the other windings having the corresponding winding number are also equal, which is not described herein again.
Setting the phase voltage vector of the "main boost phase
Are respectively three-phase input phase voltage vectors
K times (K)>1) Then according to the constraint relation between the magnetic flux of the transformer and the electromotive force of each winding, the difference vector
Respectively look ahead to the main boost vector
The phase angle is 30 degrees. Difference vector
Are the voltage vectors for winding 336, winding 316, and winding 326, respectively. Let a three-phase input (a,b, C) phase voltage amplitudes are all VPThe three-phase main boost output (A)0，B0，C0) The phase voltage amplitudes are all K.VP. By vector triangles
Vector triangle
Sum vector triangle
It can be found that the voltage amplitudes of the sixth windings on the first core limb 21, the second core limb 22 and the third core limb 23 are all: vN4＝2·VP·sin[arcsin(0.5·K)-30°]And therefore the number of turns of the sixth winding on the first leg 21, the second leg 22 and the third leg 23 is the same, all identified in fig. 3 as N4. The number of winding turns N4 can be determined by the winding voltage and the core material in actual manufacturing.
In one embodiment, the first winding and the third winding on each core leg have the same number of turns, and the fourth winding and the fifth winding on each core leg have the same number of turns. Further, on the basis that the number of turns of the corresponding windings on the first core limb 21, the second core limb 22 and the third core limb 23 is equal, the voltage amplitude of the sixth winding on each core limb can be calculated by referring to the calculation method for the voltage amplitude of the sixth winding on each core limb in the foregoing, and the voltage amplitudes of the first winding and the third winding on each core limb are both: vN1＝0.44738·K·VPTherefore, the number of turns of the first winding on the first core leg 21, the second core leg 22 and the third core leg 23 is the same as the number of turns of the third winding on the first core leg 21, the second core leg 22 and the third core leg 23, all the turns are identified as N1 in fig. 3, and the number of turns of the winding N1 can be determined by the winding voltage and the core material in actual manufacturing.
With reference to the foregoing calculation method for the voltage amplitude of the sixth winding on each core limb, the voltage amplitudes of the fourth winding and the fifth winding on each core limb are both: vN3＝0.46159·K·VP-0.5·VN1Thus, the first core limb 21, the second core limbThe number of turns of the fourth winding on the leg 22 and the third leg 23 is also equal to the voltage amplitude of the fifth winding on the first leg 21, the second leg 22 and the third leg 23, i.e. the voltage amplitudes of these six windings are equal. The number of turns of the fourth winding on the first core leg 21, the second core leg 22 and the third core leg 23 is the same as the number of turns of the fifth winding on the first core leg 21, the second core leg 22 and the third core leg 23, the number of turns is N3 in fig. 3, and the number of turns N3 of the winding can be determined by winding voltage and core material in actual manufacturing.
Further, referring to the calculation method for the voltage amplitude of the sixth winding on each core limb in the foregoing, the voltage amplitudes of the second windings on each core limb are all as follows: vN2＝0.59938·K·VPAnd therefore the number of turns of the second winding on the first leg 21, the second leg 22 and the third leg 23 is the same, all identified in fig. 3 as N2. The number of winding turns N2 can be determined by the winding voltage and the core material in actual manufacturing.
The multiphase autotransformer adopts specific winding design and structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized to enable the transformer to have three input ends and nine output ends, the three-phase line voltage input can be converted into three groups of three-phase line voltages, specific nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance of the transformer is improved, the reactive compensation and harmonic treatment cost is reduced, particularly, the multiphase autotransformer is designed according to a boosting function, the voltage of the output end is greater than that of the input end, the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like can be met, the use cost is low, and the reliability is high.
In one embodiment, referring to fig. 4-5, a rectifier system is provided comprising a full wave rectifier bridge 50 and a multi-phase autotransformer 40 as described above, the full wave rectifier bridge 50 being connected to the output of the multi-phase autotransformer 40. The multi-phase autotransformer 40 may output a specified symmetrical nine-phase voltage that may be applied to the resistive load 90 after being rectified by the full-wave rectifier bridge 50.
In one embodiment, referring to fig. 5, the full-wave rectifier bridge 50 includes nine rectifier diode bridge arms, an output terminal of the multiphase autotransformer 40 is correspondingly connected to an ac input node of one rectifier diode, a common connection terminal of a dc-side positive terminal of each rectifier diode forms a positive connection terminal of the resistive load 90, and a common connection terminal of a dc-side negative terminal of each rectifier diode forms a negative connection terminal of the resistive load 90. The nine rectifier diode bridge arms adopt 18 rectifier diodes, nine-phase output of the multi-phase autotransformer 40 is respectively connected with alternating current input nodes of the rectifier diode bridge arms, direct current side anodes of all the rectifier diode bridge arms are connected together to be connected with an anode of the rectifier resistance load 90, direct current side cathodes of all the rectifier diode bridge arms are connected together to be connected with a cathode of the rectifier resistance load 90, and the requirements of direct high-voltage power frequency AC-DC rectification application of a high-voltage frequency converter and the like can be met.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. In this embodiment, the multi-phase autotransformer is a nine-phase boost autotransformer, and includes an iron core and a winding. The core comprises an upper yoke 11, a lower yoke 12, a first core leg 21, a second core leg 22 and a third core leg 23. The winding structure 31 on the first core leg comprises a first winding 311, a second winding 312, a third winding 313, a fourth winding 314, a fifth winding 315, a sixth winding 316. The winding structure 32 on the second core leg comprises a first winding 321, a second winding 322, a third winding 323, a fourth winding 324, a fifth winding 325, a sixth winding 326. The winding structure 33 on the third core leg comprises a first winding 331, a second winding 332, a third winding 333, a fourth winding 334, a fifth winding 335, a sixth winding 336.
Referring to fig. 1, the winding directions of the windings on the first core limb 21 are the same, the heads (terminals with black dot marks) of the windings are the same terminals, and the tails (terminals without black dot marks) of the windings are the same terminals. In fig. 1, the winding directions of the windings on the second core limb 22 are the same, the heads (terminals with black dot marks) of the windings are the same terminals, and the tails (terminals without black dot marks) of the windings are the same terminals. In fig. 1, the winding directions of the windings on the third core limb 23 are the same, the heads (terminals with black dot marks) of the windings are homonymous terminals, and the tails (terminals without black dot marks) of the windings are homonymous terminals. The configuration of each winding on the first core limb 21, the configuration of each winding on the second core limb 22, the configuration of each winding on the third core limb 23, and the like are correspondingly the same.
Fig. 2 shows a schematic diagram of the connection relationship between the windings of the transformer according to this embodiment. The head of winding 311 is connected to the head of winding 324, the head of winding 321 is connected to the head of winding 334, and the head of winding 331 is connected to the head of winding 314. The tail of winding 315 is connected to the tail of winding 323, the tail of winding 325 is connected to the tail of winding 333, and the tail of winding 335 is connected to the tail of winding 313. The head of winding 336 connects the tail of winding 314 to the head of winding 315 as the a0 phase output node for one of the nine phase voltage outputs, while the tail of winding 336 serves as the a phase input node for one of the three phase voltage inputs. The head of winding 326 connects the tail of winding 334 to the head of winding 335 as the C0 phase output node for one of the nine phase voltage outputs, while the tail of winding 326 serves as the C phase input node for one of the three phase voltage inputs. The head of winding 316 is connected to the tail of winding 324 and the head of winding 325, which is connected as B for one of the nine phase voltage outputs0The phase output node, while the tail of winding 316 serves as the B-phase input node for one of the three-phase voltage inputs. The tail of winding 322 is connected to the head of winding 323, which is connected as A to one of the nine-phase voltage outputs1A phase output node. The tail of winding 332 is connected to the head of winding 333, which is connected to B as one of the nine-phase voltage outputs1A phase output node. The tail of winding 312 is connected to the head of winding 313, which is connected as C for one of the nine phase voltage outputs1A phase output node. The tail of winding 331 is connected to the head of winding 332, which is connected as A of one of the nine-phase voltage outputs2A phase output node. The tail of winding 311 is connected to the head of winding 312, which is connected as B one of the nine-phase voltage outputs2A phase output node. The tail of winding 321 is connected to the head of winding 322, which is connected as C for one of the nine-phase voltage outputs2A phase output node.
FIG. 3 is a schematic diagram of an embodiment of a multiphase reactorThe circuit schematic diagram and the phase voltage vector diagram of the coupling transformer and the corresponding relation schematic diagram of the two are shown. The nodes (A, B and C) are power frequency three-phase voltage input ends and correspond to vectors
And the power frequency three-phase input phase voltage vector is obtained. Node (A)0，B0，C0) Is a power frequency three-phase main boost phase output end and corresponds to a vector
The phase voltage vector is a power frequency three-phase main boost phase. Node (A)1，B1，C1) Corresponding vector for power frequency three-phase leading phase output end
For power frequency three-phase leading phase voltage vector
Respectively preceding the corresponding principal vectors
The phase angle is 37 degrees. Node (A)2，B2，C2) Corresponding vector for power frequency three-phase lag phase output end
For power frequency three-phase lagging phase voltage vector
Respectively lags corresponding principal vectors
The phase angle is 37 degrees.
Setting the phase voltage vector of the "main boost phase
Are respectively three-phase input phase voltage vectors
K times (K)>1) Then according to the constraint relation between the magnetic flux of the transformer and the electromotive force of each winding, the difference vector
Respectively look ahead to the main boost vector
The phase angle is 30 degrees. Difference vector
Are the voltage vectors for winding 336, winding 316, and winding 326, respectively.
Let the phase voltage amplitudes of the three-phase input (A, B, C) be VPThe three-phase main boost output (A)0，B0，C0) The phase voltage amplitudes are all K.VPBy vector triangles
Vector triangle
Sum vector triangle
The voltage amplitudes for windings 336, 316, and 326 may all be found as: vN4＝2·VP·sin[arcsin(0.5·K)-30°]And thus winding 336, winding 316, and winding 326 have the same number of turns, all identified in fig. 3 as N4. Can be actually made ofThe winding voltage and the core material determine the number of winding turns N4.
Fig. 4 is a circuit schematic of a rectifier system in one embodiment. Comprising the multi-phase autotransformer 40 and 9 full-wave rectifier bridges (61,62, 63; 71,72, 73; 81,82,83) corresponding to nine-phase rectification, and a resistive load 90, the resistive load 90 being a dc load. Each full-wave rectifier bridge is composed of two rectifier bridge arms consisting of 4 rectifier diodes respectively, and is used for connecting the multiphase autotransformer 40 and the resistive load 90. Direct current outputs of all the full-wave rectifier bridges are directly connected in parallel and then connected with a direct current load, and a balance reactor is not required to be externally connected, so that the system design is simplified, the reliability is enhanced, and the cost is reduced.
To achieve direct parallel connection of the outputs of the full-wave rectifier bridges of fig. 4, the following nine line voltage difference vectors
Equal amplitude is boosted amplitude
In order to realize symmetrical 18-pulse wave ripple after the outputs of the full-wave rectifier bridges in fig. 4 are connected in parallel, the following nine line voltage difference vectors
Etc. together with their inverse vectors (total of 18 line voltage vectors) form a vector distribution spaced 20 degrees apart over a 360 degree range. From this, the phase voltage vector of each leading phase can be obtained
The amplitude values of (A) are all 0.767. K. VPThe phase of the corresponding leading main vector is about 37 degrees; voltage vector of each lagging phase
The amplitude of (A) is also 0.767. K. VPThe corresponding lag dominant vector phase is about 37 degrees.
Referring to the vector relationships in FIG. 3, and considering: the voltage vector direction of each winding on the first core limb 21 is the same, for example the same as the voltage vector direction on winding 316. The voltage vector direction of each winding on the core leg of the second iron 22 is the same, e.g. the same as the voltage vector direction on winding 326. The voltage vector direction of each winding on the third leg 23 is the same, for example, as the voltage vector direction on winding 336. Thus, the voltage amplitude and the number of turns of each winding can be obtained through the calculation of the amplitude and the phase of each vector polygon.
The voltage amplitudes of winding 311, winding 313, winding 321, winding 323, winding 331, and winding 333 are: vN1＝0.44738·K·VPAnd therefore the number of turns for winding 311, winding 313, winding 321, winding 323, winding 331, and winding 333 are the same, all identified in fig. 3 as N1. The number of winding turns N1 can be determined by the winding voltage and the core material in actual manufacturing.
The voltage amplitudes of winding 314, winding 315, winding 324, winding 325, winding 334, and winding 335 are: vN3＝0.46159·K·VP-0.5·VN1And thus winding 314, winding 315, winding 324, winding 325, winding 334, and winding 335 have the same number of turns, all identified in fig. 3 as N3. The number of winding turns N3 can be determined by the winding voltage and the core material in actual manufacturing.
The voltage amplitudes of winding 312, winding 322, and winding 332 are: vN2＝0.59938·K·VPAnd thus the number of turns in winding 312, winding 322, and winding 332 are the same, all identified in fig. 3 as N2. The number of winding turns N2 can be determined by the winding voltage and the core material in actual manufacturing.
In another aspect of the present application there is provided a rectifier system comprising a multiphase autotransformer 40 and a full wave rectifier bridge 50. The full-wave rectifier bridge 50 is composed of 2 rectifier diode bridge arms consisting of 4 rectifier diodes and is used for connecting the nine-phase boost autotransformer and the direct-current load. Direct current output of the full-wave rectifier bridge is directly connected in parallel and then connected with a direct current load, and an external balance reactor is not needed, so that the application cost of the system is reduced.
Optionally, the nine-phase output of the nine-phase boost autotransformer is respectively connected to the ac input nodes of the rectifier diode bridge arms, the anodes of the dc sides of all the rectifier diode bridge arms are connected together to connect with the anode of the rectifier load, and the cathodes of the dc sides of all the rectifier diode bridge arms are connected together to connect with the cathode of the rectifier load.
The boosting rectifier transformer adopts specific winding design and structural layout, achieves the THD requirement of the total harmonic content of input current of 9-phase 18-pulse-wave power frequency AC-DC rectification, can directly connect the direct-current side output of a 9-phase full-wave rectifier bridge in parallel, and simultaneously realizes the unique boosting function.
Fig. 4 illustrates the principle application of the multiphase autotransformer outputting specific symmetrical 9-phase line voltages, and in principle, after the 9-phase line voltages are respectively subjected to full-wave rectification, the output direct current sides are directly connected in parallel to form 18-pulse rectification outputs, fig. 5 is a practical application circuit schematic diagram of an embodiment of the application, only a minimum of 18 rectifier diodes are used to form nine rectifier diode bridge arms 50, the nine-phase output of the nine-phase boost autotransformer 40 is respectively connected with the alternating current input nodes of the rectifier diode bridge arms, the direct current sides of all the rectifier diode bridge arms are connected together to be connected with the positive electrodes of the rectifier loads, and the direct current sides of all the rectifier diode bridge arms are connected together to be connected with the negative electrodes of the rectifier loads. The application system of fig. 5 meets the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like.
Fig. 6 is a schematic diagram of an embodiment of a rectifier system applied with 18-step input current waveforms and 18-pulse output rectified voltage waveforms, where input current harmonics meet the requirement of 10.1% of the theoretical value of the total harmonic content THD of input current of conventional "9-phase 18-pulse" power frequency AC-DC rectification. And the ripple of the high-voltage direct current 18 pulse wave voltage waveform directly output by rectification can be controlled to be about 5%, so that the burden of a subsequent filter circuit is reduced.
The rectifier system adopts the specific winding design and the structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized to enable the transformer to have three input ends and nine output ends, the three-phase line voltage input can be converted into three-phase line voltage groups, specific nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance of the transformer is improved, the reactive compensation and harmonic treatment cost are reduced, the multi-phase autotransformer has the boosting function, the application requirements of direct high-voltage power frequency AC-DC rectification of a high-voltage frequency converter and the like can be met, the cost of a rectification system is reduced, and the reliability is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A multiphase autotransformer is characterized by comprising a first iron core column, a second iron core column and a third iron core column, wherein a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding are arranged on the first iron core column, the second iron core column and the third iron core column;
a first end of a first winding on the first core limb is connected with a first end of a fourth winding on the second core limb, a first end of the first winding on the second core limb is connected with a first end of the fourth winding on the third core limb, and a first end of the first winding on the third core limb is connected with a first end of the fourth winding on the first core limb;
a second end of a fifth winding on the first core leg is connected to a second end of a third winding on the second core leg, a second end of the fifth winding on the second core leg is connected to a second end of the third winding on the third core leg, and a second end of the fifth winding on the third core leg is connected to a second end of the third winding on the first core leg;
a second end of a fourth winding on the first core limb and a first end of a fifth winding on the first core limb are both connected with a first end of a sixth winding on the third core limb, a second end of the fourth winding on the third core limb and a first end of the fifth winding on the third core limb are both connected with a first end of the sixth winding on the second core limb, and a second end of the fourth winding on the second core limb and a first end of the fifth winding on the second core limb are both connected with a first end of the sixth winding on the first core limb;
a second end of a second winding on the second core leg is connected to a first end of a third winding on the second core leg, a second end of the second winding on the third core leg is connected to a first end of the third winding on the third core leg, and a second end of the second winding on the first core leg is connected to a first end of the third winding on the first core leg;
a second end of the first winding on the third core column is connected with a first end of the second winding on the third core column, a second end of the first winding on the first core column is connected with a first end of the second winding on the first core column, and a second end of the first winding on the second core column is connected with a first end of the second winding on the second core column;
the input end of the multiphase autotransformer comprises a second end of a sixth winding on the first iron core column, a second end of a sixth winding on the second iron core column and a second end of a sixth winding on the third iron core column, the output end of the multiphase autotransformer comprises a common connecting end of a fourth winding and a fifth winding on each iron core column, a common connecting end of a second winding and a third winding on each iron core column and a common connecting end of a first winding and a second winding on each iron core column, and the multiphase autotransformer has a boosting function.
2. The multiphase autotransformer of claim 1, wherein the winding directions of the windings on the first core leg are the same, the winding directions of the windings on the second core leg are the same, and the winding directions of the windings on the third core leg are the same.
3. The multiphase autotransformer of claim 1, wherein the output of the multiphase autotransformer comprises a main boost three-phase voltage output, a leading phase three-phase voltage output, and a lagging phase three-phase voltage output, wherein the main boost three-phase voltage output comprises a common connection end of a fourth winding and a fifth winding on the first core limb, a common connection end of the fourth winding and the fifth winding on the second core limb, and a common connection end of the fourth winding and the fifth winding on the third core limb, the leading phase three-phase voltage output comprises a common connection end of a second winding and a third winding on the first core limb, a common connection end of the second winding and the third winding on the second core limb, and a common connection end of the second winding and the third winding on the third core limb, and the lagging phase three-phase voltage output comprises a common connection end of a first winding and a second winding on the first core limb, a leading phase three-phase voltage output, and a lagging phase voltage output, And the common connecting end of the first winding and the second winding on the second iron core column and the common connecting end of the first winding and the second winding on the third iron core column.
4. The multiphase autotransformer of claim 3, wherein the leading phase three phase voltage output outputs a voltage vector that leads the voltage vector output by the primary boost three phase voltage output, and wherein the lagging phase three phase voltage output outputs a voltage vector that lags the voltage vector output by the primary boost three phase voltage output.
5. The multiphase autotransformer of claim 1, wherein the vector of the voltage output from the common connection end of the fourth winding and the fifth winding on the first core leg is
The voltage vector output by the common connection end of the fourth winding and the fifth winding on the second iron core column is
The voltage vector output by the common connecting end of the fourth winding and the fifth winding on the third iron core column is
The voltage vector output by the common connection end of the second winding and the third winding on the first iron core column is
The voltage vector output by the common connection end of the second winding and the third winding on the second iron core column is
The voltage vector output by the common connecting end of the second winding and the third winding on the third iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the first iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the second iron core column is
The voltage vector output by the common connecting end of the first winding and the second winding on the third iron core column is
Vector of line voltage difference
And
are equal in magnitude.
6. The multiphase autotransformer of claim 5, wherein the linear voltage difference vector
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
7. The multiphase autotransformer of claim 1, wherein the number of turns of the corresponding windings on the first core leg, the second core leg, and the third core leg are equal.
8. The multiphase autotransformer of claim 7, wherein the first winding and the third winding on each core leg have the same number of turns, and the fourth winding and the fifth winding on each core leg have the same number of turns.
9. A rectifier system comprising a multiphase autotransformer as claimed in any of claims 1 to 8 and a full wave rectifier bridge connected to an output of the multiphase autotransformer.
10. The rectifier system of claim 9, wherein the full-wave rectifier bridge comprises nine rectifier diode bridge arms, an output end of the multi-phase autotransformer is correspondingly connected to an alternating current input node of one rectifier diode bridge arm, a common connection end of a direct current side positive pole of each rectifier diode bridge arm forms a load positive connection end, and a common connection end of a direct current side negative pole of each rectifier diode bridge arm forms a load negative connection end.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112820523A (en) * | 2021-02-04 | 2021-05-18 | 东莞南方半导体科技有限公司 | Multiphase autotransformer and rectifier system |
| CN112820524A (en) * | 2021-02-04 | 2021-05-18 | 东莞南方半导体科技有限公司 | Multi-phase transformer and rectifier system |
| CN114337325A (en) * | 2022-03-17 | 2022-04-12 | 国网天津市电力公司电力科学研究院 | Electric automobile fills electric pile rectifier circuit based on many pulse current converters |
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2021
- 2021-02-04 CN CN202120317865.6U patent/CN215815555U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112820523A (en) * | 2021-02-04 | 2021-05-18 | 东莞南方半导体科技有限公司 | Multiphase autotransformer and rectifier system |
| CN112820524A (en) * | 2021-02-04 | 2021-05-18 | 东莞南方半导体科技有限公司 | Multi-phase transformer and rectifier system |
| CN112820523B (en) * | 2021-02-04 | 2024-07-30 | 东莞南方半导体科技有限公司 | Multiphase autotransformer and rectifier system |
| CN112820524B (en) * | 2021-02-04 | 2024-07-30 | 东莞南方半导体科技有限公司 | Multiphase transformer and rectifier system |
| CN114337325A (en) * | 2022-03-17 | 2022-04-12 | 国网天津市电力公司电力科学研究院 | Electric automobile fills electric pile rectifier circuit based on many pulse current converters |
| CN114337325B (en) * | 2022-03-17 | 2022-06-17 | 国网天津市电力公司电力科学研究院 | Electric automobile fills electric pile rectifier circuit based on many pulse current converters |
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