CN111404444A - A three-phase input multi-phase output four-quadrant integrated machine circuit - Google Patents

Abstract

The application discloses a three-phase input multiphase output type four-quadrant all-in-one machine circuit which comprises an L C filtering loop, an upper electricity buffer loop, a frequency conversion rectifying loop, a filtering voltage division loop, a frequency conversion inversion loop and a permanent magnet synchronous motor, wherein the first end of the L C filtering loop is electrically connected with a three-phase alternating current power supply, the second end of the L C filtering loop is electrically connected with the first end of the upper electricity buffer loop, the two ends of the frequency conversion rectifying loop are respectively electrically connected with the second end of the upper electricity buffer loop and the first end of the filtering voltage division loop, the two ends of the frequency conversion inverting loop are respectively electrically connected with the second end of the filtering voltage division loop and the permanent magnet synchronous motor, the energy of the loops flows in a two-way mode, the energy generated in the electric power generation state of the permanent magnet synchronous motor is fed back to the three-phase alternating current power supply.

Description

A three-phase input multi-phase output four-quadrant integrated machine circuit

technical field

The present application relates to the technical field of industrial variable frequency drive control, in particular to a three-phase input and multi-phase output type four-quadrant integrated machine circuit.

Background technique

At present, the application of permanent magnet variable frequency motor integrated machine is still very rare. The equipment used is basically used separately from the inverter and the motor, which requires a large amount of installation area. At the same time, most inverters are installed far away from the motor, not only the installation It is more complicated, and the longer cable increases the installation cost and also produces more interference, which increases du/dt, affects the drive performance of the inverter, and also affects the insulation and oxidation of the motor, reducing the life of the motor. The existing all-in-one machines are also simple three-phase input three-phase output two-quadrant all-in-one machines, and there is no design application scheme for the more energy-saving and better performance four-quadrant multi-phase output all-in-one machines.

Compared with asynchronous motors, permanent magnet synchronous motors have higher efficiency and larger starting torque. Compared with asynchronous motors, they also have great advantages in terms of saving electric energy and reducing power grid. Polyphase motors have the advantages of large output torque and low requirements for winding insulation. With the advancement of science and technology, the torque and power requirements of coal transportation and other equipment have become higher, and multi-phase permanent magnet synchronous motors will become a development direction.

Most of the traditional all-in-one machines are large in size and complex in structure, and most of the motors of the all-in-one machine are of asynchronous motor structure, which has many shortcomings. The distance between the frequency conversion and the motor output of the existing products is limited, the output harmonic peak has a great influence on the motor insulation, and the output torque is large, so the performance of the existing all-in-one machine needs to be improved.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present application proposes the following technical solutions:

In the first aspect, the embodiments of the present application provide a three-phase input and multi-phase output four-quadrant integrated machine circuit, including: an LC filter circuit, a power-on buffer circuit, a frequency conversion rectifier circuit, a filter voltage divider circuit, a frequency conversion inverter circuit, Permanent magnet synchronous motor, the first end of the LC filter circuit is electrically connected to the three-phase AC power supply, the second end is electrically connected to the first end of the power-on buffer circuit, and the two ends of the frequency conversion rectifier circuit are respectively connected to the The second end of the power-on buffer circuit is electrically connected to the first end of the filtering voltage dividing circuit, and the two ends of the frequency conversion inverter circuit are respectively electrically connected to the second end of the filtering voltage dividing circuit and the permanent magnet synchronous motor. connected, the energy of the above-mentioned loop flows in both directions, and the energy generated in the motor-generating state of the permanent magnet synchronous motor is fed back to the three-phase AC power supply.

By adopting the above implementation manner, the three-phase input and multi-phase output type four-quadrant integrated machine circuit and the three-phase input and multi-phase output can effectively improve the output torque of the motor. With the function of energy feedback, it can use the electricity generated by the motor to feedback, which is more energy-saving and efficient.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the LC filter loop includes a first capacitor, a second capacitor, a third capacitor and a reactor, and the first end of the three-phase winding of the reactor They are respectively connected in series in the three-phase AC power supply, and the second end is electrically connected to the power-on buffer circuit; the first end of the first capacitor, the first end of the second capacitor and the first end of the third capacitor are connected together , the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are respectively connected to different phase ends of the three-phase AC power supply. Compared with the traditional LCL filter circuit, while ensuring the performance, an AC reactor is omitted, the structure is simpler, and the production cost of the product is effectively reduced.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the power-on buffer loop includes a control switch, a first resistor, a second resistor, and a third resistor, and the control The switch includes three sub-switches, two ends of the first resistor, the second resistor and the third resistor are respectively electrically connected to two ends of different sub-switches, the first end of the first resistor, the The first end of the second resistor and the first end of the third resistor are respectively electrically connected to the second end of the reactor, the second end of the first resistor, the second end of the second resistor and The second ends of the third resistors are respectively electrically connected to the first ends of the variable frequency rectification loop.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the frequency conversion rectifier circuit includes: a first IGBT module, a second IGBT module, a third IGBT module, and a fourth IGBT module, fifth IGBT module, sixth IGBT module, seventh IGBT module, eighth IGBT module, ninth IGBT module, tenth IGBT module, eleventh IGBT module, twelfth IGBT module, thirteenth IGBT module, The fourteenth IGBT module, the fifteenth IGBT module, the sixteenth IGBT module, the seventeenth IGBT module and the eighteenth IGBT module, wherein: each IGBT module includes a freewheeling diode in reverse parallel connection of the IGBT, and the first IGBT module , the second IGBT module, the third IGBT module, the fourth IGBT module, the fifth IGBT module and the sixth IGBT module form a one-phase bridge arm, the seventh IGBT module, the eighth IGBT module, the ninth IGBT module, and the tenth IGBT module , The eleventh IGBT module and the twelfth IGBT module form a one-phase bridge arm, the thirteenth IGBT module, the fourteenth IGBT module, the fifteenth IGBT module, the sixteenth IGBT module, the seventeenth IGBT module and the tenth IGBT module Eight IGBT modules form a one-phase bridge arm; the first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module are connected in series in sequence, and the collector of the first IGBT module, the collector of the seventh IGBT module and the tenth IGBT module are connected in series. The collector of the three IGBT modules is electrically connected to the DC+ terminal of the bus bar, the emitter of the first IGBT module is electrically connected to the collector of the second IGBT module, the emitter of the second IGBT module is electrically connected to the collector of the third IGBT module, and the connection to the R-phase power supply; the emitter of the third IGBT module is electrically connected to the collector of the fourth IGBT module, the emitter-emitter of the fourth IGBT module, the collector of the tenth IGBT module and the emitter of the sixteenth IGBT module are all The fifth IGBT module and the sixth IGBT module are connected in series, the collector of the fifth IGBT module is electrically connected with the emitter of the first IGBT module, and the emitter of the sixth IGBT module is electrically connected with the fourth IGBT module The collector of the seventh IGBT module, the eighth IGBT module, the ninth IGBT module and the tenth IGBT module are connected in series in sequence, the emitter of the seventh IGBT module is electrically connected to the collector of the eighth IGBT module, and the eighth IGBT module is electrically connected to the collector of the eighth IGBT module. The emitter of the module is electrically connected to the collector of the ninth IGBT module and is connected to the S-phase power supply; the emitter of the ninth IGBT module is electrically connected to the collector of the tenth IGBT module, the eleventh IGBT module and the twelfth IGBT module are electrically connected connected in series, the collector of the eleventh IGBT module is electrically connected to the emitter of the seventh IGBT module, the emitter of the twelfth IGBT module is electrically connected to the collector of the tenth IGBT module; the thirteenth IGBT module, the fourteenth IGBT module IGBT module, fifteenth IG The BT module and the sixteenth IGBT module are sequentially connected in series, the emitter of the thirteenth IGBT module is electrically connected to the collector of the fourteenth IGBT module, and the emitter of the fourteenth IGBT module is electrically connected to the collector of the fifteenth IGBT module. Connected, connected to the T-phase power supply, the emitter of the fifteenth IGBT module is electrically connected to the collector of the sixteenth IGBT module, the seventeenth IGBT module and the eighteenth IGBT module are connected in series, and the collector of the seventeenth IGBT module is electrically connected to the emitter of the thirteenth IGBT module, and the emitter of the eighteenth IGBT module is electrically connected to the collector of the sixteenth IGBT module.

The frequency conversion rectifier circuit is a three-level topology with neutral point clamping, the output harmonics are small, and the influence of harmonics on the power grid can be greatly reduced in the electric state. In the power generation state, the feedback waveform is a trapezoidal wave, which is closer to the LC filter after LC filtering. Sine wave, better feedback to the grid, will not affect the distortion of the grid voltage.

With reference to the third possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, the filtering voltage dividing loop includes: a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third capacitor Eighth capacitor, ninth capacitor, tenth capacitor, eleventh capacitor, twelfth capacitor, thirteenth capacitor, fourteenth capacitor, fifteenth capacitor, sixteenth capacitor, seventeenth capacitor, eighteenth capacitor , the nineteenth capacitor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor, among which: the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor The capacitor and the eleventh capacitor are connected in series in sequence, and the twelfth capacitor, the thirteenth capacitor, the fourteenth capacitor, the fifteenth capacitor, the sixteenth capacitor, the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor are in sequence. connected in series, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are connected in series in sequence; the first end of the fourth capacitor and the first end of the twelfth capacitor are respectively electrically connected to the first end of the fourth resistor, The first end of the fifth capacitor and the first end of the thirteenth capacitor are respectively electrically connected with the second end of the fourth resistor; the first end of the sixth capacitor and the first end of the fourteenth capacitor are respectively connected with the second end of the fifth resistor. The first end is electrically connected, the first end of the seventh capacitor and the first end of the fifteenth capacitor are respectively electrically connected to the second end of the fifth resistor; the first end of the eighth capacitor and the first end of the sixteenth capacitor are respectively electrically connected to the first end of the sixth resistor, the first end of the ninth capacitor and the first end of the seventeenth capacitor are respectively electrically connected to the second end of the sixth resistor; the first end of the tenth capacitor and the tenth The first end of the eighth capacitor is respectively electrically connected to the first end of the seventh resistor, the first end of the eleventh capacitor and the first end of the nineteenth capacitor are respectively electrically connected to the second end of the seventh resistor; the resistor R1- R4 divides the DC power supply into two groups, which are +1, 01, -1 potentials and +2, 02, -2 potentials, where -1 and +2 are equal potentials.

With reference to the fourth possible implementation manner of the first aspect, in the fifth possible implementation manner of the first aspect, the frequency conversion inverter circuit includes: a nineteenth IGBT module, a twentieth IGBT module, and a twenty-first IGBT module, twenty-second IGBT module, twenty-third IGBT module, twenty-fourth IGBT module, twenty-fifth IGBT module, twenty-sixth IGBT module, twenty-seventh IGBT module, twenty-eighth IGBT module , the 29th IGBT module, the 30th IGBT module, the 31st IGBT module, the 32nd IGBT module, the 33rd IGBT module, the 34th IGBT module, the 35th IGBT module, the 3rd IGBT module Thirty-six IGBT modules, thirty-seventh IGBT modules, thirty-eighth IGBT modules, thirty-ninth IGBT modules, fortieth IGBT modules, forty-first IGBT modules and forty-second IGBT modules, of which: each An IGBT module includes a freewheeling diode in reverse parallel connection of the IGBT. The collectors of the twenty-first IGBT module, the thirty-seventh IGBT module, and the thirty-seventh IGBT module are all electrically connected to +1 potential. The nineteenth IGBT module, the The collectors of the twenty-seventh IGBT module and the thirty-fifth IGBT module are all electrically connected to the 01 potential, and the emitters of the twenty-second IGBT module, the thirty-first IGBT module, and the thirty-eighth IGBT module are all connected to the -1 potential. Electrical connection; the collectors of the twenty-third IGBT module, the thirty-second IGBT module, and the thirty-ninth IGBT module are all electrically connected to the +2 potential, the twentieth IGBT module, the twenty-eighth IGBT module, the thirty-ninth IGBT module, and the The collectors of the six IGBT modules are all electrically connected to the 02 potential, and the emitters of the twenty-fourth IGBT module, the thirty-third IGBT module, and the fortieth IGBT module are all electrically connected to the -2 potential; the emitter of the nineteenth IGBT module is electrically connected to the -2 potential. The pole is electrically connected to the collector of the twenty-fifth IGBT module, the emitter of the twenty-seventh IGBT module is electrically connected to the collector of the thirty-fourth IGBT module, and the emitter of the thirty-fifth IGBT module is electrically connected to the forty-first IGBT module. The collector of the IGBT module is electrically connected, the emitter of the twentieth IGBT module is electrically connected to the collector of the twenty-sixth IGBT module, and the emitter of the twenty-eighth IGBT module is electrically connected to the collector of the twenty-ninth IGBT module , the emitter of the thirty-sixth IGBT module is electrically connected to the collector of the forty-second IGBT module; the twenty-first IGBT module, the twenty-second IGBT module, the twenty-third IGBT module and the twenty-fourth IGBT module connected in series, the emitter of the twenty-first IGBT module is electrically connected to the collector of the twenty-second IGBT module, and the emitter of the twenty-third IGBT module is electrically connected to the collector of the twenty-fourth IGBT module; The IGBT module, the thirty-first IGBT module, the thirty-second IGBT module, and the thirty-third IGBT module are connected in series, and the emitter of the thirty-first IGBT module is electrically connected to the collector of the thirty-first IGBT module, and the thirty-first IGBT module is electrically connected to the collector. two The emitter of the IGBT module is electrically connected to the collector of the thirty-third IGBT module; the thirty-seventh IGBT module, the thirty-eighth IGBT module, the thirty-ninth IGBT module and the fortieth IGBT module are connected in series, The emitter of the seventh IGBT module is electrically connected to the collector of the thirty-eighth IGBT module, and the emitter of the thirty-ninth IGBT module is electrically connected to the collector of the fortieth IGBT module.

The frequency conversion inverter circuit adopts two sets of T-type three-level topology, which can effectively reduce the use of IGBT modules while ensuring performance. The emitter of the twenty-first IGBT module is electrically connected to the collector of the twenty-second IGBT module, and the output As the U-phase output (U1) of the first group of T-type three-level topology, the emitter of the twenty-third IGBT module is electrically connected to the collector of the twenty-fourth IGBT module, and the output is used as the second group of T-type three-level topology. U-phase output (U2) for flat topology. The emitter of the thirtieth IGBT module is electrically connected to the collector of the thirty-first IGBT module, and the output is the V-phase output (V1) of the first group of T-type three-level topology, and the emitter of the thirty-second IGBT module It is electrically connected to the collector of the thirty-third IGBT module, and the output is the V-phase output (V2) of the second group of T-type three-level topology. The emitter of the thirty-seventh IGBT module is electrically connected to the collector of the thirty-eighth IGBT module, and the output is the W-phase output (W1) of the first group of T-type three-level topology, and the emitter of the thirty-ninth IGBT module The pole is electrically connected to the collector of the fortieth IGBT module, and the output is the W-phase output (W2) of the second group of T-type three-level topology. Among them, each phase output is connected with an independent Hall sampling module.

The frequency conversion inverter circuit is a T-type three-level series structure, and fewer IGBT modules are used, which can greatly reduce the production cost. Multi-phase output can improve the output torque of the motor, and at the same time can reduce the requirements for the insulation voltage of the motor. The output waveform is a trapezoidal wave, with less harmonic content and low voltage spike, which can effectively reduce the insulation oxidation damage to the motor and greatly prolong the service life of the motor.

Combined with the third possible implementation manner of the first aspect, in the sixth possible implementation manner of the first aspect, in the electric state, the three-phase AC power supply after passing through the LC filter circuit and the power-on buffer circuit passes through the IGBT module. The current diode is rectified into DC; in the power generation state, the DC power is fed back to the three-phase AC power side after PWM modulation through the on-off of the IGBT.

With reference to the fourth possible implementation manner of the first aspect, in the seventh possible implementation manner of the first aspect, the capacitors in the filtering voltage dividing loop are all film capacitors.

In combination with the fifth possible implementation manner of the first aspect, in the eighth possible implementation manner of the first aspect, when the variable frequency inverter circuit is in an electric state, the two DC power sources divided by the filtering and voltage dividing circuit respectively pass through the IGBT When the module is turned on and off, the PWM modulates and inverts it into two AC power supplies, and the output provides energy to the permanent magnet synchronous motor; in the power generation state, it is rectified into a DC power supply through the freewheeling diode of the IGBT module and fed back to the side of the variable frequency rectifier circuit.

In combination with the first aspect or any of the first to eight possible implementations of the first aspect, in a ninth possible implementation of the first aspect, the permanent magnet synchronous motor is a multi-phase permanent magnet synchronous motor, and each group of windings is It adopts independent structure and has the same parameters.

Description of drawings

1 is a schematic frame diagram of a three-phase input and multi-phase output type four-quadrant integrated machine circuit provided by an embodiment of the present application;

2 is a schematic structural diagram of an LC filter loop provided by an embodiment of the present application;

3 is a schematic structural diagram of a power-on buffer loop provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a frequency conversion rectifier circuit provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a filter voltage divider loop provided by an embodiment of the present application;

6 is a schematic structural diagram of a frequency conversion inverter circuit provided by an embodiment of the present application;

The symbols in Figure 1-6 are represented as:

L-reactor, SW-control switch, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh Capacitor, C8-Eighth Capacitor, C9-Ninth Capacitor, C10-Tenth Capacitor, C11-Eleventh Capacitor, C12-Twelfth Capacitor, C13-Thirteenth Capacitor, C14-Fourteenth Capacitor, C15- The fifteenth capacitor, C16-the sixteenth capacitor, C17-the seventeenth capacitor, C18-the eighteenth capacitor, C19-the nineteenth capacitor, R1-the first resistor, R2-the second resistor, R3-the third resistor , R4- fourth resistor, R5- fifth resistor, R6- sixth resistor, R7- sixth resistor, Q1- first IGBT module, Q2- second IGBT module, Q3- third IGBT module, Q4- fourth IGBT module, Q5-fifth IGBT module, Q6-sixth IGBT module, Q7-seventh IGBT module, Q8-eighth IGBT module, Q9-ninth IGBT module, Q10-tenth IGBT module, Q11-eleventh IGBT module IGBT module, Q12-12th IGBT module, Q13-13th IGBT module, Q14-14th IGBT module, Q15-15th IGBT module, Q16-16th IGBT module, Q17-17th IGBT module , Q18-18th IGBT module, Q19-19th IGBT module, Q20-20th IGBT module, Q21-21st IGBT module, Q22-22nd IGBT module, Q23-23rd IGBT Module, Q24-Twenty-fourth IGBT module, Q25-Twenty-fifth IGBT module, Q26-Twenty-sixth IGBT module, Q27-Twenty-seventh IGBT module, Q28-Twenty-eighth IGBT module, Q29-No. Twenty-nine IGBT modules, Q30-thirtieth IGBT modules, Q31- thirty-first IGBT modules, Q32- thirty-second IGBT modules, Q33- thirty-third IGBT modules, Q34- thirty-fourth IGBT modules, Q35-35th IGBT module, Q36-36th IGBT module, Q37-37th IGBT module, Q38-38th IGBT module, Q39-39th IGBT module, Q40-40th IGBT module IGBT module, Q41-41st IGBT module, Q42-42nd IGBT module.

Detailed ways

The solution will be described below with reference to the accompanying drawings and specific embodiments.

1 is a schematic frame diagram of a three-phase input and multi-phase output four-quadrant integrated machine circuit provided by an embodiment of the present application. Referring to FIG. 1 , the three-phase input and multi-phase output four-quadrant integrated computer circuit provided by the embodiment of the present application includes: : LC filter circuit, power-on buffer circuit, frequency conversion rectifier circuit, filter voltage divider circuit, frequency conversion inverter circuit, permanent magnet synchronous motor, the first end of the LC filter circuit is electrically connected to the three-phase AC power supply, and the second end is electrically connected to the three-phase AC power supply. The first end of the power-on buffer loop is electrically connected, the two ends of the frequency conversion rectifier loop are respectively electrically connected with the second end of the power-on buffer loop and the first end of the filter voltage divider loop, the frequency conversion Two ends of the inverter circuit are respectively electrically connected with the second end of the filter voltage dividing circuit and the permanent magnet synchronous motor, the energy of the above-mentioned circuit flows bidirectionally, and the energy generated in the motor-generating state of the permanent magnet synchronous motor is fed back to the three-phase AC power. The permanent magnet synchronous motor is a multi-phase permanent magnet synchronous motor, and each group of windings adopts an independent structure and has the same parameters.

Referring to FIG. 2, the LC filter circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and a reactor L, and the first ends of the three-phase windings of the reactor L are respectively connected in series with the three-phase AC power supply, The second end is electrically connected to the power-on buffer loop; the first end of the first capacitor C1, the first end of the second capacitor C2 and the first end of the third capacitor C3 are connected together, and the first capacitor The second terminal of C1 , the second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are respectively connected to different phase terminals of the three-phase AC power supply. Compared with the traditional LCL filter circuit, while ensuring the performance, an AC reactor L is omitted, the structure is simpler, and the production cost of the product is effectively reduced.

Referring to FIG. 3, the power-on buffer loop includes a control switch SW, a first resistor R1, a second resistor R2 and a third resistor R3, the control switch SW includes three sub-switches, the first resistor R1, the third resistor R1 Two ends of the second resistor R2 and the third resistor R3 are electrically connected to two ends of different sub-switches, respectively. The first end of the first resistor R1, the first end of the second resistor R2 and the second The first ends of the three resistors R3 are respectively electrically connected to the second ends of the reactor L, the second ends of the first resistor R1 , the second ends of the second resistor R2 and the third resistor R3 The second ends are respectively electrically connected to the first ends of the variable frequency rectification loop.

Referring to FIG. 4 , the frequency conversion rectifier circuit includes: a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, a fourth IGBT module Q4, a fifth IGBT module Q5, a sixth IGBT module Q6, and a seventh IGBT module Module Q7, Eighth IGBT Module Q8, Ninth IGBT Module Q9, Tenth IGBT Module Q10, Eleventh IGBT Module Q11, Twelfth IGBT Module Q12, Thirteenth IGBT Module Q13, Fourteenth IGBT Module Q14, The fifteenth IGBT module Q15, the sixteenth IGBT module Q16, the seventeenth IGBT module Q17 and the eighteenth IGBT module Q18, wherein: each IGBT module includes a freewheeling diode in reverse parallel connection of the IGBT.

The first IGBT module Q1, the second IGBT module Q2, the third IGBT module Q3, the fourth IGBT module Q4, the fifth IGBT module Q5 and the sixth IGBT module Q6 form a one-phase bridge arm, the seventh IGBT module Q7 and the eighth IGBT module The module Q8, the ninth IGBT module Q9, the tenth IGBT module Q10, the eleventh IGBT module Q11 and the twelfth IGBT module Q12 form a one-phase bridge arm, the thirteenth IGBT module Q13, the fourteenth IGBT module Q14, and the tenth IGBT module Q14. The five IGBT modules Q15, the sixteenth IGBT module Q16, the seventeenth IGBT module Q17 and the eighteenth IGBT module Q18 form a one-phase bridge arm.

The first IGBT module Q1, the second IGBT module Q2, the third IGBT module Q3 and the fourth IGBT module Q4 are connected in series in sequence, the collector of the first IGBT module Q1, the collector of the seventh IGBT module Q7 and the thirteenth IGBT module The collector of Q13 is electrically connected to the DC+ terminal of the bus bar, the emitter of the first IGBT module Q1 is electrically connected to the collector of the second IGBT module Q2, and the emitter of the second IGBT module Q2 is electrically connected to the collector of the third IGBT module Q3 , connected to the R-phase power supply. The emitter of the third IGBT module Q3 is electrically connected to the collector of the fourth IGBT module Q4, the emitter of the fourth IGBT module Q4, the collector of the tenth IGBT module Q10 and the emitter of the sixteenth IGBT module Q16 are all It is electrically connected to the DC- terminal of the bus bar. The fifth IGBT module Q5 and the sixth IGBT module Q6 are connected in series, the collector of the fifth IGBT module Q5 is electrically connected to the emitter of the first IGBT module Q1, and the emitter of the sixth IGBT module Q6 is electrically connected to the collector of the fourth IGBT module Q4. Electrodes are electrically connected.

The seventh IGBT module Q7, the eighth IGBT module Q8, the ninth IGBT module Q9 and the tenth IGBT module Q10 are sequentially connected in series, the emitter of the seventh IGBT module Q7 is electrically connected to the collector of the eighth IGBT module Q8, and the eighth IGBT module Q7 is electrically connected to the collector of the eighth IGBT module Q8. The emitter of the module Q8 is electrically connected to the collector of the ninth IGBT module Q9 to the S-phase power supply. The emitter of the ninth IGBT module Q9 is electrically connected to the collector of the tenth IGBT module Q10, the eleventh IGBT module Q11 and the twelfth IGBT module Q12 are connected in series, and the collector of the eleventh IGBT module Q11 is connected to the seventh IGBT module The emitter of Q7 is electrically connected, and the emitter of the twelfth IGBT module Q12 is electrically connected to the collector of the tenth IGBT module Q10.

The thirteenth IGBT module Q13, the fourteenth IGBT module Q14, the fifteenth IGBT module Q15 and the sixteenth IGBT module Q16 are sequentially connected in series, and the emitter of the thirteenth IGBT module Q13 and the collector of the fourteenth IGBT module Q14 Electrically connected, the emitter of the fourteenth IGBT module Q14 is electrically connected to the collector of the fifteenth IGBT module Q15, and is connected to the T-phase power supply. The emitter of the fifteenth IGBT module Q15 is electrically connected to the collector of the sixteenth IGBT module Q16, the seventeenth IGBT module Q17 and the eighteenth IGBT module Q18 are connected in series, and the collector of the seventeenth IGBT module Q17 is connected to the tenth IGBT module Q17. The emitters of the three IGBT modules Q13 are electrically connected, and the emitters of the eighteenth IGBT module Q18 are electrically connected to the collectors of the sixteenth IGBT module Q16.

The frequency conversion rectifier circuit is a three-level topology with neutral point clamping, the output harmonics are small, and the influence of harmonics on the power grid can be greatly reduced in the electric state. In the power generation state, the feedback waveform is a trapezoidal wave, which is closer to the LC filter after LC filtering. Sine wave, better feedback to the grid, will not affect the distortion of the grid voltage.

In the electric state, the three-phase AC power after passing through the LC filter circuit and the power-on buffer circuit is rectified into DC through the freewheeling diode of the IGBT module; in the power generation state, the DC power is modulated by PWM through the on-off of the IGBT. Feedback to the three-phase AC power supply side.

Referring to FIG. 5 , the filtering voltage dividing loop includes: a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor Capacitor C11, Twelfth Capacitor C12, Thirteenth Capacitor C13, Fourteenth Capacitor C14, Fifteenth Capacitor C15, Sixteenth Capacitor C16, Seventeenth Capacitor C17, Eighteenth Capacitor C18, Nineteenth Capacitor C19 , the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the capacitors in the filtering voltage dividing loop are all film capacitors.

The fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10 and the eleventh capacitor C11 are connected in series in sequence, and the twelfth capacitor C12, The thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18 and the nineteenth capacitor C19 are connected in series in sequence, and the fourth resistor R4, The fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 are sequentially connected in series.

The first end of the fourth capacitor C4 and the first end of the twelfth capacitor C12 are respectively electrically connected to the first end of the fourth resistor R4, the first end of the fifth capacitor C5 and the first end of the thirteenth capacitor C13 are respectively It is electrically connected to the second end of the fourth resistor R4. The first end of the sixth capacitor C6 and the first end of the fourteenth capacitor C14 are respectively electrically connected to the first end of the fifth resistor R5, the first end of the seventh capacitor C7 and the first end of the fifteenth capacitor C15 are respectively It is electrically connected to the second end of the fifth resistor R5. The first end of the eighth capacitor C8 and the first end of the sixteenth capacitor C16 are respectively electrically connected to the first end of the sixth resistor R6, the first end of the ninth capacitor C9 and the first end of the seventeenth capacitor C17 are respectively It is electrically connected to the second end of the sixth resistor R6. The first end of the tenth capacitor C10 and the first end of the eighteenth capacitor C18 are respectively electrically connected to the first end of the seventh resistor R7, the first end of the eleventh capacitor C11 and the first end of the nineteenth capacitor C19 They are respectively electrically connected to the second ends of the seventh resistors R7. Resistors R1-R4 divide the DC power supply into two groups, which are +1, 01, -1 potentials and +2, 02, -2 potentials, where -1 and +2 are equal potentials.

Referring to FIG. 6, the frequency conversion inverter circuit includes: a nineteenth IGBT module Q19, a twentieth IGBT module Q20, a twenty-first IGBT module Q21, a twenty-second IGBT module Q22, a twenty-third IGBT module Q23, The twenty-fourth IGBT module Q24, the twenty-fifth IGBT module Q25, the twenty-sixth IGBT module Q26, the twenty-seventh IGBT module Q27, the twenty-eighth IGBT module Q28, the twenty-ninth IGBT module Q29, the third Ten IGBT modules Q30, thirty-first IGBT modules Q31, thirty-second IGBT modules Q32, thirty-third IGBT modules Q33, thirty-fourth IGBT modules Q34, thirty-fifth IGBT modules Q35, thirty-sixth IGBT modules module Q36, thirty-seventh IGBT module Q37, thirty-eighth IGBT module Q38, thirty-ninth IGBT module Q39, fortieth IGBT module Q40, forty-first IGBT module Q41 and forty-second IGBT module Q42, Wherein: each IGBT module includes a freewheeling diode in reverse parallel connection with the IGBT.

Collectors of the twenty-first IGBT module Q21, the thirtieth IGBT module Q30, and the thirty-seventh IGBT module Q37 are all electrically connected to +1 potential. The collectors of the nineteenth IGBT module Q19, the twenty-seventh IGBT module Q27, and the thirty-fifth IGBT module Q35 are all electrically connected to the 01 potential. The emitters of the twenty-second IGBT module Q22, the thirty-first IGBT module Q31, and the thirty-eighth IGBT module Q38 are all electrically connected to the -1 potential. Collectors of the twenty-third IGBT module Q23, the thirty-second IGBT module Q32, and the thirty-ninth IGBT module Q39 are all electrically connected to the +2 potential. The collectors of the twentieth IGBT module Q20, the twenty-eighth IGBT module Q28, and the thirty-sixth IGBT module Q36 are all electrically connected to the 02 potential. The emitters of the twenty-fourth IGBT module Q24, the thirty-third IGBT module Q33, and the fortieth IGBT module Q40 are all electrically connected to the -2 potential.

The emitter of the nineteenth IGBT module Q19 is electrically connected to the collector of the twenty-fifth IGBT module Q25, the emitter of the twenty-seventh IGBT module Q27 is electrically connected to the collector of the thirty-fourth IGBT module Q34, and the thirty-fourth IGBT module Q34 is electrically connected to the emitter. The emitter of the fifth IGBT module Q35 is electrically connected to the collector of the forty-first IGBT module Q41, the emitter of the twentieth IGBT module Q20 is electrically connected to the collector of the twenty-sixth IGBT module Q26, and the twenty-eighth IGBT module The emitter of Q28 is electrically connected to the collector of the twenty-ninth IGBT module Q29, and the emitter of the thirty-sixth IGBT module Q36 is electrically connected to the collector of the forty-second IGBT module Q42.

The twenty-first IGBT module Q21, the twenty-second IGBT module Q22, the twenty-third IGBT module Q23, and the twenty-fourth IGBT module Q24 are connected in series, and the emitter of the twenty-first IGBT module Q21 is connected to the twenty-second IGBT module Q21. The collector of the module Q22 is electrically connected, and the emitter of the twenty-third IGBT module Q23 is electrically connected to the collector of the twenty-fourth IGBT module Q24.

The thirtieth IGBT module Q30, the thirty-first IGBT module Q31, the thirty-second IGBT module Q32 and the thirty-third IGBT module Q33 are connected in series, and the emitter of the thirty-first IGBT module Q30 is connected to the thirty-first IGBT module Q31 The collector of the thirty-second IGBT module Q32 is electrically connected to the collector of the thirty-third IGBT module Q33.

The thirty-seventh IGBT module Q37, the thirty-eighth IGBT module Q38, the thirty-ninth IGBT module Q39 and the fortieth IGBT module Q40 are connected in series, and the emitter of the thirty-seventh IGBT module Q37 is connected to the thirty-eighth IGBT module The collector of Q38 is electrically connected, and the emitter of the thirty-ninth IGBT module Q39 is electrically connected to the collector of the fortieth IGBT module Q40.

The frequency conversion inverter circuit adopts two sets of T-type three-level topology, which can effectively reduce the use of IGBT modules while ensuring performance. The emitter of the twenty-first IGBT module Q21 is electrically connected to the collector of the twenty-second IGBT module Q22. , the output is the U-phase output (U1) of the first group of T-type three-level topology, the emitter of the twenty-third IGBT module Q23 is electrically connected to the collector of the twenty-fourth IGBT module Q24, and the output is the second group of U-phase output (U2) for T-type 3-level topology. The emitter of the thirtieth IGBT module Q30 is electrically connected to the collector of the thirty-first IGBT module Q31, and the output is the V-phase output (V1) of the first group of T-type three-level topology, and the thirty-second IGBT module Q32 The emitter of IGBT is electrically connected to the collector of the thirty-third IGBT module Q33, and the output is the V-phase output (V2) of the second group of T-type three-level topology. The emitter of the thirty-seventh IGBT module Q37 is electrically connected to the collector of the thirty-eighth IGBT module Q38, and the output is the W-phase output (W1) of the first group of T-type three-level topology, and the thirty-ninth IGBT module The emitter of Q39 is electrically connected to the collector of the fortieth IGBT module Q40, and the output is the W-phase output (W2) of the second group of T-type three-level topology. Among them, each phase output is connected with an independent Hall sampling module.

The frequency conversion inverter circuit is a T-type three-level series structure, and fewer IGBT modules are used, which can greatly reduce the production cost. Multi-phase output can improve the output torque of the motor, and at the same time can reduce the requirements for the insulation voltage of the motor. The output waveform is a trapezoidal wave, with less harmonic content and low voltage spike, which can effectively reduce the insulation oxidation damage to the motor and greatly prolong the service life of the motor.

When the frequency conversion and inverter circuit is in the electric state, the two-way DC power supply divided by the filtering and voltage-dividing circuit is respectively turned on and off by the IGBT module, and the PWM modulation inverter is converted into two-way AC power supply, and the output provides energy to the permanent magnet synchronous motor; In the power generation state, the DC power is rectified by the freewheeling diode of the IGBT module and fed back to the side of the variable frequency rectification circuit.

It can be seen from the above embodiments that the three-phase input and multi-phase output type four-quadrant integrated machine circuit provided in this embodiment has three-phase input and multi-phase output, which can effectively improve the output torque of the motor. With the function of energy feedback, it can use the electricity generated by the motor to feedback, which is more energy-saving and efficient.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Of course, the above description is not limited to the above examples, and the technical features not described in this application can be realized by or using existing technologies, and will not be repeated here; the above embodiments and drawings are only used to illustrate the technical solutions of this application, not It is a limitation of the present application. If it is replaced, the present application is only described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that those of ordinary skill in the art can make Changes, modifications, additions or substitutions do not depart from the purpose of the present application, and should also belong to the protection scope of the claims of the present application.

Claims (10)

1. a three-phase input multi-phase output type four-quadrant integrated machine circuit is characterized in that, comprising: LC filter circuit, power-on buffer circuit, frequency conversion rectifier circuit, filter voltage divider circuit, frequency conversion inverter circuit, permanent magnet synchronous motor , the first end of the LC filter circuit is electrically connected to the three-phase AC power supply, the second end is electrically connected to the first end of the power-on buffer circuit, and the two ends of the frequency conversion rectifier circuit are respectively connected to the power-on buffer circuit. The second end of the loop is electrically connected to the first end of the filter voltage dividing circuit, and the two ends of the frequency conversion inverter circuit are respectively electrically connected to the second end of the filtering voltage dividing circuit and the permanent magnet synchronous motor. The energy flows in both directions, and the energy generated by the permanent magnet synchronous motor in the motor-generating state is fed back to the three-phase AC power supply. 2. The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 1, wherein the LC filter circuit comprises a first capacitor, a second capacitor, a third capacitor and a reactor, and the reactance The first ends of the three-phase windings of the transformer are respectively connected in series with the three-phase AC power supply, and the second ends are electrically connected to the power-on buffer circuit; the first ends of the first capacitor, the first ends of the second capacitor and the third The first ends of the capacitors are connected together, and the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are respectively connected to different phase ends of the three-phase AC power supply. 3. The three-phase input multi-phase output four-quadrant integrated machine circuit according to claim 2, wherein the power-on buffer loop comprises a control switch, a first resistor, a second resistor and a third resistor, the The control switch includes three sub-switches, two ends of the first resistor, the second resistor and the third resistor are respectively electrically connected to two ends of different sub-switches, the first end of the first resistor, all the The first end of the second resistor and the first end of the third resistor are respectively electrically connected to the second end of the reactor, the second end of the first resistor, the second end of the second resistor and the second end of the third resistor are respectively electrically connected to the first end of the variable frequency rectification loop. 4 . The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 3 , wherein the frequency conversion rectification circuit comprises: a first IGBT module, a second IGBT module, a third IGBT module, a fourth IGBT module, and a fourth IGBT module. 5 . IGBT module, fifth IGBT module, sixth IGBT module, seventh IGBT module, eighth IGBT module, ninth IGBT module, tenth IGBT module, eleventh IGBT module, twelfth IGBT module, thirteenth IGBT module , the fourteenth IGBT module, the fifteenth IGBT module, the sixteenth IGBT module, the seventeenth IGBT module and the eighteenth IGBT module, wherein: Each IGBT module includes a freewheeling diode in reverse parallel connection with the IGBT. The first IGBT module, the second IGBT module, the third IGBT module, the fourth IGBT module, the fifth IGBT module and the sixth IGBT module form a phase bridge arm. The seventh IGBT module, the eighth IGBT module, the ninth IGBT module, the tenth IGBT module, the eleventh IGBT module and the twelfth IGBT module form a one-phase bridge arm, the thirteenth IGBT module, the fourteenth IGBT module, the tenth IGBT module The five IGBT modules, the sixteenth IGBT module, the seventeenth IGBT module and the eighteenth IGBT module form a one-phase bridge arm; The first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module are connected in series in sequence, and the collector of the first IGBT module, the collector of the seventh IGBT module and the collector of the thirteenth IGBT module are connected to the busbar DC+ The terminals are electrically connected, the emitter of the first IGBT module is electrically connected to the collector of the second IGBT module, the emitter of the second IGBT module is electrically connected to the collector of the third IGBT module, and is connected to the R-phase power supply; the third IGBT module The emitter of the fourth IGBT module is electrically connected to the collector of the fourth IGBT module, and the emitter-emitter of the fourth IGBT module, the collector of the tenth IGBT module and the emitter of the sixteenth IGBT module are all electrically connected to the DC-terminal of the busbar; The fifth IGBT module and the sixth IGBT module are connected in series, the collector of the fifth IGBT module is electrically connected to the emitter of the first IGBT module, and the emitter of the sixth IGBT module is electrically connected to the collector of the fourth IGBT module; The seventh IGBT module, the eighth IGBT module, the ninth IGBT module and the tenth IGBT module are sequentially connected in series, the emitter of the seventh IGBT module is electrically connected to the collector of the eighth IGBT module, and the emitter of the eighth IGBT module is electrically connected to the collector of the eighth IGBT module. The collector of the ninth IGBT module is electrically connected to the S-phase power supply; the emitter of the ninth IGBT module is electrically connected to the collector of the tenth IGBT module, the eleventh IGBT module and the twelfth IGBT module are connected in series, and the eleventh IGBT module is connected in series. The collector of the IGBT module is electrically connected to the emitter of the seventh IGBT module, and the emitter of the twelfth IGBT module is electrically connected to the collector of the tenth IGBT module; The thirteenth IGBT module, the fourteenth IGBT module, the fifteenth IGBT module and the sixteenth IGBT module are sequentially connected in series, the emitter of the thirteenth IGBT module is electrically connected to the collector of the fourteenth IGBT module, and the fourteenth IGBT module is electrically connected The emitter of the IGBT module is electrically connected to the collector of the fifteenth IGBT module and is connected to the T-phase power supply, the emitter of the fifteenth IGBT module is electrically connected to the collector of the sixteenth IGBT module, the seventeenth IGBT module and the The eighteenth IGBT modules are connected in series, the collector of the seventeenth IGBT module is electrically connected to the emitter of the thirteenth IGBT module, and the emitter of the eighteenth IGBT module is electrically connected to the collector of the sixteenth IGBT module. 5. The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 4, wherein the filter voltage divider circuit comprises: a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, The eighth capacitor, the ninth capacitor, the tenth capacitor, the eleventh capacitor, the twelfth capacitor, the thirteenth capacitor, the fourteenth capacitor, the fifteenth capacitor, the sixteenth capacitor, the seventeenth capacitor, the eighteenth capacitor capacitor, nineteenth capacitor, fourth resistor, fifth resistor, sixth resistor and seventh resistor, where: The fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor and the eleventh capacitor are connected in series in sequence, and the twelfth capacitor, the thirteenth capacitor, and the fourteenth capacitor are connected in series. , the fifteenth capacitor, the sixteenth capacitor, the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor are connected in series in sequence, and the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are connected in series in sequence; The first end of the fourth capacitor and the first end of the twelfth capacitor are respectively electrically connected to the first end of the fourth resistor, and the first end of the fifth capacitor and the first end of the thirteenth capacitor are respectively connected to the first end of the fourth resistor. The second terminal is electrically connected; the first terminal of the sixth capacitor and the first terminal of the fourteenth capacitor are respectively electrically connected to the first terminal of the fifth resistor, the first terminal of the seventh capacitor and the first terminal of the fifteenth capacitor are respectively electrically connected are respectively electrically connected to the second end of the fifth resistor; the first end of the eighth capacitor and the first end of the sixteenth capacitor are respectively electrically connected to the first end of the sixth resistor, and the first end of the ninth capacitor and the tenth The first end of the seventh capacitor is respectively electrically connected to the second end of the sixth resistor; the first end of the tenth capacitor and the first end of the eighteenth capacitor are respectively electrically connected to the first end of the seventh resistor, and the eleventh capacitor The first end of the 19th capacitor and the first end of the nineteenth capacitor are respectively electrically connected to the second end of the seventh resistor; the resistors R1-R4 divide the DC power supply into two groups, which are +1, 01, -1 potential and +2, 02, -2 potential, where -1 and +2 are equipotential. 6 . The three-phase input multi-phase output four-quadrant integrated machine circuit according to claim 5 , wherein the frequency conversion inverter circuit comprises: a nineteenth IGBT module, a twentieth IGBT module, a twenty-first IGBT module, twenty-second IGBT module, twenty-third IGBT module, twenty-fourth IGBT module, twenty-fifth IGBT module, twenty-sixth IGBT module, twenty-seventh IGBT module, twenty-eighth IGBT module, the twenty-ninth IGBT module, the thirty-first IGBT module, the thirty-first IGBT module, the thirty-second IGBT module, the thirty-third IGBT module, the thirty-fourth IGBT module, the thirty-fifth IGBT module, The thirty-sixth IGBT module, the thirty-seventh IGBT module, the thirty-eighth IGBT module, the thirty-ninth IGBT module, the fortieth IGBT module, the forty-first IGBT module and the forty-second IGBT module, wherein: Each IGBT module includes a freewheeling diode in reverse parallel connection with the IGBT. The collectors of the twenty-first IGBT module, the thirty-seventh IGBT module and the thirty-seventh IGBT module are all electrically connected to +1 potential. The nineteenth IGBT module, The collectors of the twenty-seventh IGBT module and the thirty-fifth IGBT module are all electrically connected to the 01 potential, and the emitters of the twenty-second IGBT module, the thirty-first IGBT module, and the thirty-eighth IGBT module are all connected to -1 The potential is electrically connected; the collectors of the twenty-third IGBT module, the thirty-second IGBT module, and the thirty-ninth IGBT module are all electrically connected to the +2 potential, and the twentieth IGBT module, the twenty-eighth IGBT module, the third The collectors of the sixteen IGBT modules are all electrically connected to the 02 potential, and the emitters of the twenty-fourth IGBT module, the thirty-third IGBT module, and the fortieth IGBT module are all electrically connected to the -2 potential; The emitter of the nineteenth IGBT module is electrically connected to the collector of the twenty-fifth IGBT module, the emitter of the twenty-seventh IGBT module is electrically connected to the collector of the thirty-fourth IGBT module, and the The emitter is electrically connected to the collector of the forty-first IGBT module, the emitter of the twentieth IGBT module is electrically connected to the collector of the twenty-sixth IGBT module, and the emitter of the twenty-eighth IGBT module is electrically connected to the twenty-ninth IGBT module. The collector of the IGBT module is electrically connected, and the emitter of the thirty-sixth IGBT module is electrically connected to the collector of the forty-second IGBT module; The twenty-first IGBT module, the twenty-second IGBT module, the twenty-third IGBT module, and the twenty-fourth IGBT module are connected in series, and the emitter of the twenty-first IGBT module is electrically connected to the collector of the twenty-second IGBT module. connected, the emitter of the twenty-third IGBT module is electrically connected to the collector of the twenty-fourth IGBT module; the thirtieth IGBT module, the thirty-first IGBT module, the thirty-second IGBT module and the thirty-third IGBT module connected in series, the emitter of the thirtieth IGBT module is electrically connected to the collector of the thirty-first IGBT module, the emitter of the thirty-second IGBT module is electrically connected to the collector of the thirty-third IGBT module; the thirty-seventh IGBT module is electrically connected to the collector; The IGBT module, the thirty-eighth IGBT module, the thirty-ninth IGBT module, and the fortieth IGBT module are connected in series, the emitter of the thirty-seventh IGBT module is electrically connected to the collector of the thirty-eighth IGBT module, and the thirtieth The emitters of the nine IGBT modules are electrically connected to the collectors of the fortieth IGBT module. 7. The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 4, characterized in that, in the electric state, the three-phase AC power after passing through the LC filter circuit and the power-on buffer circuit passes through the IGBT module. The freewheeling diode is rectified into DC; in the power generation state, the DC power is fed back to the three-phase AC power side after being modulated by PWM through the on-off of the IGBT. 8 . The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 5 , wherein the capacitors in the filter voltage dividing loop are all film capacitors. 9 . 9 . The three-phase input and multi-phase output type four-quadrant integrated machine circuit according to claim 6 , wherein, when the frequency conversion inverter circuit is in an electric state, the two DC power sources divided by the filter and voltage divider circuit are respectively passed through. 10 . When the IGBT module is turned on and off, the PWM modulates and inverts it into two AC power supplies, and the output provides energy to the permanent magnet synchronous motor; in the power generation state, it is rectified into a DC power supply through the freewheeling diode of the IGBT module and fed back to the side of the variable frequency rectifier circuit. 10. The three-phase input and multi-phase output four-quadrant integrated machine circuit according to any one of claims 1 to 9, wherein the permanent magnet synchronous motor is a multi-phase permanent magnet synchronous motor, and each group of windings adopts an independent synchronous motor. The structure and parameters are the same.

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