CN108616214B - Drive topology for eliminating PWM frequency noise of double three-phase motor - Google Patents

Drive topology for eliminating PWM frequency noise of double three-phase motor Download PDF

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CN108616214B
CN108616214B CN201810484058.6A CN201810484058A CN108616214B CN 108616214 B CN108616214 B CN 108616214B CN 201810484058 A CN201810484058 A CN 201810484058A CN 108616214 B CN108616214 B CN 108616214B
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coil
phase motor
double
pwm frequency
phase
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CN108616214A (en
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黄盈亮
徐永向
张文韬
邹继斌
邹继明
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/50—Reduction of harmonics

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a driving topology for eliminating PWM frequency noise of a double three-phase motor, which comprises two identical voltage source inverters VSI1 and VSI2, a double three-phase motor M and three identical coupling inductors La, Lb and Lc. The invention utilizes the coupling inductor to eliminate PWM frequency harmonic waves in the output phase voltage of the three-phase motor driver or the three-phase power inverter. The novel topology provided by the invention not only keeps the advantage of fast dynamic response of the traditional circuit topology, but also can effectively reduce the voltage and current harmonic waves of PWM frequency, eliminate the electromagnetic vibration of the PWM frequency of the motor, greatly reduce the volume of an output filter of the power inverter and have extremely high application value and economic value.

Description

Drive topology for eliminating PWM frequency noise of double three-phase motor
Technical Field
The invention relates to a dual three-phase motor driving topology, in particular to a driving topology for eliminating PWM frequency noise, which is used for a three-phase motor driver or a three-phase power inverter.
Background
Conventional motor drivers or power inverters generally employ an SVPWM strategy to modulate a bus voltage to obtain a three-phase alternating current voltage. The generated phase voltage contains a large amount of harmonic waves, wherein the harmonic waves are mainly concentrated around the PWM frequency and the integral multiple frequency of the PWM frequency. For example, when the PWM frequency is 10.0kHz, the phase voltage harmonics thereof are mainly concentrated around 10.0kHz, 20.0 kHz, 30.0 kHz, 40.0 kHz. The phase voltage input motor generates corresponding current, and the current excites vibration and noise with corresponding frequency on the motor. When the PWM frequency is around 10.0kHz, the SVPWM strategy can cause the motor to generate noise that is audible to the human ear.
The existing motor system or grid-connected inverter generally does not have the PWM noise suppression capability. Common methods are to increase the PWM frequency and to use LC filters. Increasing the PWM frequency significantly increases the switching losses of the inverter, which is not suitable for high power and heat generation applications. The conventional LC filter is adopted to eliminate the noise of the PWM frequency, and there are three main disadvantages:
(1) the inductance of the LC filter requires the rated current through the motor. In order to prevent the inductor from saturating, the volume of the inductor core is huge. Thus, the weight and cost of the LC filter are greatly increased.
(2) The introduction of the LC filter also increases the order of the motor control system, the control characteristic of the motor current is deteriorated, and the dynamic performance of the system is reduced.
(3) The inductance and capacitance of the LC filter itself will increase the impedance of the line, resulting in increased system losses.
Disclosure of Invention
The invention aims to provide a driving topology for eliminating PWM frequency noise of a double three-phase motor, which utilizes a coupling inductor to eliminate PWM frequency harmonic waves in output phase voltages of a three-phase motor driver or a three-phase power inverter. The invention can effectively eliminate the electromagnetic vibration of the PWM frequency of the motor, greatly reduce the volume of the output filter of the three-phase power inverter and has extremely high application value and economic value.
The purpose of the invention is realized by the following technical scheme:
a drive topology for eliminating PWM frequency noise of a double three-phase motor comprises two identical voltage source inverters VSI1 and VSI2, a double three-phase motor M and three identical coupling inductors La, Lb and Lc, wherein:
the coupling inductors La, Lb and Lc are all composed of an iron core, a first coil and a second coil, the number of turns of the first coil is the same as that of the second coil, the first coil and the second coil are wound on the same iron core, and the winding directions of the first coil and the second coil are opposite;
the voltage source inverter VSI1 and the voltage source inverter VSI2 are connected in parallel on the same bus DC _ link;
the output end A1 of the voltage source inverter VSI1 and the input end of the first coil of the coupling inductor La
Figure DEST_PATH_IMAGE001
B1 and the input end of the first coil of the coupled inductor Lb
Figure 374767DEST_PATH_IMAGE001
C1 and the input end of the first coil of the coupling inductor Lc
Figure 291908DEST_PATH_IMAGE001
Connecting;
the output end A2 of the voltage source inverter VSI2 and the input end of the second coil of the coupling inductor La
Figure 760061DEST_PATH_IMAGE002
B2 and an input end of a second coil of the coupled inductor Lb
Figure 155270DEST_PATH_IMAGE002
C2 and the input end of the second coil of the coupled inductor Lc
Figure 969642DEST_PATH_IMAGE002
Connecting;
an output end of the La first coil
Figure DEST_PATH_IMAGE003
Connected to input terminal x1 of double three-phase motor M, output terminal of first coil Lb
Figure 729788DEST_PATH_IMAGE003
Connected with the input end y1 of the double three-phase motor M, and the output end of the first coil of Lc
Figure 996821DEST_PATH_IMAGE003
The input end z1 of the double three-phase motor M is connected;
an output end of the La second coil
Figure 382672DEST_PATH_IMAGE004
Connected with input terminal x2 of double three-phase motor M, and output terminal of second coil Lb
Figure 51551DEST_PATH_IMAGE004
Connected with input end y2 of double three-phase motor M, and output end of Lc second coil
Figure 982597DEST_PATH_IMAGE004
And is connected with an input terminal z2 in the double three-phase motor M.
Compared with the prior art, the invention has the following advantages:
1. the novel topology provided by the invention not only keeps the advantage of fast dynamic response of the traditional circuit topology, but also can effectively reduce the voltage and current harmonic waves of PWM frequency, eliminate the electromagnetic vibration of the PWM frequency of the motor, greatly reduce the volume of an output filter of the power inverter and have extremely high application value and economic value.
2. The novel topology of the invention can effectively eliminate audible noise of human ears generated by the PWM technology, effectively eliminate electromagnetic vibration of PWM of the motor and greatly reduce the volume of an output filter of the power inverter.
Drawings
FIG. 1 is a conventional dual three-phase motor drive circuit topology;
FIG. 2 is a dual three-phase motor drive circuit topology according to the present invention;
FIG. 3 is an inverter (VSI) topology;
fig. 4 is a schematic structural diagram of the coupling inductors (La, Lb, Lc), in which:
Figure 736927DEST_PATH_IMAGE001
is the input end of the first coil and is,
Figure 162354DEST_PATH_IMAGE002
is an input end of the second coil,
Figure 685739DEST_PATH_IMAGE003
is the output end of the first coil and is,
Figure 115584DEST_PATH_IMAGE004
is the output end of the second coil;
FIG. 5 is a dual three-phase motor driver carrier and modulation wave;
FIG. 6 illustrates a conventional dual three-phase motor driven topology motor noise;
fig. 7 is a diagram of motor noise for a dual three-phase motor drive topology employing the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
As shown in fig. 1, a conventional dual three-phase motor circuit topology comprising two identical voltage source inverters VSI1 and VSI2 and a dual three-phase motor M, VSI1 and VSI2 is shown in fig. 3. The voltage source inverter VSI1 and the voltage source inverter VSI2 are connected in parallel on the same bus DC _ link; the output ends A1, B1 and C1 of the voltage source inverter VSI1 are respectively connected with the input ends x1, y1 and z1 of the double three-phase motor M; the output terminals a2, B2, C2 of the voltage source inverter VSI2 are connected to the input terminals x2, y2, z2 in the dual three-phase motor, respectively.
As shown in fig. 2, the dual three-phase motor driving topology provided by the present invention includes two identical voltage source inverters VSI1 and VSI2, a dual three-phase motor M, and three identical coupling inductors La, Lb, and Lc, wherein: the circuit topologies of VSI1 and VSI2 are shown in fig. 3; the structure of the coupling inductors La, Lb, and Lc is shown in fig. 4, where the coupling inductors La, Lb, and Lc are each composed of an iron core, and a first coil and a second coil with the same number of turns, the same iron core is wound with the first coil and the second coil with the same number of turns, and the winding directions of the first coil and the second coil are opposite. In the invention, the iron core can have an air gap or not, the iron core is not limited to the shape in the figure, the winding mode of the first coil and the second coil is not limited to the mode in the figure, and the specific winding mode is related to the wiring mode of the coupling inductor.
The voltage source inverter VSI1 and the voltage source inverter VSI2 are connected in parallel on the same bus DC _ link. Output terminal a1 of the voltage source inverter VSI1 and input terminal of the first coil of the coupling inductor La
Figure 294892DEST_PATH_IMAGE001
B1 and the input end of the first coil of the coupled inductor Lb
Figure 570016DEST_PATH_IMAGE001
C1 and the input end of the first coil of the coupling inductor Lc
Figure 400438DEST_PATH_IMAGE001
Are connected. Output end A2 of voltage source inverter VSI2 and input end of second coil of coupling inductor La
Figure 735604DEST_PATH_IMAGE002
B2 and an input end of a second coil of the coupled inductor Lb
Figure 402209DEST_PATH_IMAGE002
C2 and the input end of the second coil of the coupled inductor Lc
Figure 481023DEST_PATH_IMAGE002
Are connected. Output end of La first coil
Figure 979001DEST_PATH_IMAGE003
Connected to input terminal x1 of double three-phase motor M, output terminal of first coil Lb
Figure 439063DEST_PATH_IMAGE003
Connected with the input end y1 of the double three-phase motor M, and the output end of the first coil of Lc
Figure 389701DEST_PATH_IMAGE003
And is connected with an input terminal z1 in the double three-phase motor M. Output end of the La second coil
Figure 272207DEST_PATH_IMAGE004
Connected with input terminal x2 of double three-phase motor M, and output terminal of second coil Lb
Figure 562374DEST_PATH_IMAGE004
Connected with input end y2 of double three-phase motor M, and output end of Lc second coil
Figure 504922DEST_PATH_IMAGE004
And is connected with an input terminal z2 in the double three-phase motor M.
The different numbers of PWM harmonics are eliminated by adjusting the carrier phase difference of the two voltage source inverters VSI1 and VSI 2. For example, when the carrier phases of the voltage source inverters VSI1 and VSI2 are different by half (180 degrees) of the carrier period, the modulation wave phases are the same, as shown in fig. 5, and the harmonics of the PWM frequency can be eliminated.
When the PWM frequency is 8.0 kHz, the noise of the motor driven by the driver adopting the conventional topology is shown in fig. 6, and the noise of the motor driven by the driver adopting the novel topology of the present invention is shown in fig. 7. As can be seen by comparing FIG. 6 with FIG. 7, the audible noise at 8.0 kHz is reduced by 16 dB.

Claims (1)

1. A drive topology for eliminating PWM frequency noise of a dual three-phase motor, the drive topology comprising two identical voltage source inverters VSI1 and VSI2, a dual three-phase motor M and three identical coupling inductors La, Lb and Lc, wherein:
the coupling inductors La, Lb and Lc are all composed of an iron core, a first coil and a second coil, wherein the number of turns of the first coil is the same as that of the second coil; the winding directions of the first coil and the second coil are opposite;
the voltage source inverter VSI1 and the voltage source inverter VSI2 are connected in parallel on the same bus DC _ link;
the output end A1 of the voltage source inverter VSI1 and the input end of the first coil of the coupling inductor La
Figure DEST_PATH_IMAGE002
B1 and the input end of the first coil of the coupled inductor Lb
Figure 830380DEST_PATH_IMAGE002
C1 and the input end of the first coil of the coupling inductor Lc
Figure 747520DEST_PATH_IMAGE002
Connecting;
the output end A2 of the voltage source inverter VSI2 and the input end of the second coil of the coupling inductor La
Figure DEST_PATH_IMAGE004
B2 and an input end of a second coil of the coupled inductor Lb
Figure 589574DEST_PATH_IMAGE004
C2 and the input end of the second coil of the coupled inductor Lc
Figure 797833DEST_PATH_IMAGE004
Connecting;
x1, y1 and z1 are first three-phase windings of the double three-phase motor M, and x2, y2 and z2 are second three-phase windings of the double three-phase motor M;
an output end of the La first coil
Figure DEST_PATH_IMAGE006
Connected to input terminal x1 of double three-phase motor M, output terminal of first coil Lb
Figure 674522DEST_PATH_IMAGE006
Connected with the input end y1 of the double three-phase motor M, and the output end of the first coil of Lc
Figure 496984DEST_PATH_IMAGE006
The input end z1 of the double three-phase motor M is connected;
an output end of the La second coil
Figure DEST_PATH_IMAGE008
Connected with input terminal x2 of double three-phase motor M, and output terminal of second coil Lb
Figure 577067DEST_PATH_IMAGE008
Connected with input end y2 of double three-phase motor M, and output end of Lc second coil
Figure 775967DEST_PATH_IMAGE008
And is connected with an input terminal z2 in the double three-phase motor M.
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