CN109921672B - Three-phase inverter minimum switching loss method based on double carrier waves and synthesized modulation waves - Google Patents

Three-phase inverter minimum switching loss method based on double carrier waves and synthesized modulation waves Download PDF

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CN109921672B
CN109921672B CN201910144649.3A CN201910144649A CN109921672B CN 109921672 B CN109921672 B CN 109921672B CN 201910144649 A CN201910144649 A CN 201910144649A CN 109921672 B CN109921672 B CN 109921672B
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switching loss
modulation
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carrier
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CN109921672A (en
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梁光耀
宋加旺
刘广财
刘红伟
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Jiaxing Fuer Electronic Technology Co ltd
Setri Group Co ltd
Shanghai Baozhun Power Technology Co ltd
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Setri Group Co ltd
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Abstract

The invention discloses a minimum switching loss method of a three-phase inverter based on double carrier waves and synthesized modulated waves, which comprises the following steps. Step S1: and superposing the zero sequence component on the sine modulation wave to form a synthesized modulation wave through modulation. Step S2: the synthesized modulated wave is superposed on a bipolar carrier wave to form a driving signal G by modulationaA drive signal GbAnd a drive signal Gc. The invention discloses a three-phase inverter minimum switching loss method based on double carriers and synthesized modulated waves, which adopts bipolar carriers and a minimum switching loss PWM strategy of synthesized modulated waves of novel zero-sequence components and sine waves to avoid the defect that the traditional DPWM can only realize the minimum switching loss within a specific power factor range, so that the switching loss can be further optimized when the power factor range is further reduced, and the DPWM can realize the discontinuous modulation strategy of the minimum switching loss within the full power factor range.

Description

Three-phase inverter minimum switching loss method based on double carrier waves and synthesized modulation waves
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a minimum switching loss method of a three-phase inverter based on double carrier waves and a synthesized modulation wave.
Background
With the rapid development of power electronic technology, the three-phase voltage source inverter is widely applied to the fields of alternating current motor drivers, electric energy quality, new energy power generation and the like. Switching loss is a main factor restricting the improvement of inverter efficiency, and in order to improve the efficiency and power density of the inverter, the switching loss of the inverter needs to be effectively reduced. The conventional carrier modulation SPWM method is realized by comparing a triangular carrier with a sinusoidal modulation wave. While discontinuous modulation DPWM is implemented by injecting a specially shaped zero sequence component into the modulated wave, it can reduce the switching loss of conventional SPWM modulation. However, the conventional DPWM can only achieve minimum switching loss within a specific power factor range, and when the power factor range is further reduced, the above method cannot reduce the switching loss to some extent, but is not an optimal method, and the switching loss still has a large optimization space.
Disclosure of Invention
The invention overcomes the defects in the prior art, and provides a three-phase inverter minimum switching loss method based on double carrier waves and synthesized modulated waves.
The invention adopts the following technical scheme that the method for minimizing the switching loss of the three-phase inverter based on the double carrier waves and the synthesized modulation waves comprises the following steps:
step S1: superposing the zero sequence component on the sine modulation wave to form a synthetic modulation wave through modulation;
step S2: the synthesized modulated wave is superposed on a bipolar carrier wave to form a driving signal G by modulationaA drive signal GbAnd a drive signal Gc。
According to the above technical scheme, the zero sequence component in step S1 is v0The expression is as follows:
Figure BDA0001979601580000021
wherein:
when in use
Figure BDA0001979601580000022
When x is
Figure BDA0001979601580000023
And
Figure BDA0001979601580000024
maximum value of (1);
when in use
Figure BDA0001979601580000025
In which x modifies the reference signal by three phases
Figure BDA0001979601580000026
And
Figure BDA0001979601580000027
and | v of three-phase symmetric reference signal* a|,|v* bI and | v* cThe median of | is determined together;
wherein:
by introducing power factor angle
Figure BDA0001979601580000028
Three-phase corrected reference signal
Figure BDA0001979601580000029
And
Figure BDA00019796015800000210
from three-phase symmetrical reference signals v* a,、v* b、v* cThe transformation yields:
Figure BDA00019796015800000211
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein，MiIs the modulation degree of the inverter.
According to the above technical solution, the sinusoidal modulation wave in step S1 includes va **、vb **、vc **Sine modulated wave va **、vb **、vc **The expression of (a) is:
Figure BDA00019796015800000212
wherein, three-phase symmetrical reference signal v* a,、v* b、v* cThe expression of (a) is:
Figure BDA0001979601580000031
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein M isiIs the modulation degree of the inverter.
According to the above technical solution, the bipolar carrier in step S2 is VtriDriving signal GaA drive signal GbA drive signal GcThe expression of (a) is:
Figure BDA0001979601580000032
according to the above technical solution, the bipolar carrier in step S2 has two opposite polarities of + Vtri and-Vtri.
According to the above technical solution, the bipolar carrier in step S2 is embodied as a bipolar triangular carrier.
According to the above technical solution, the bipolar triangular carrier has two opposite polarities of + Vtri and-Vtri.
The minimum switching loss method of the three-phase inverter based on the double carrier waves and the synthesized modulation waves has the advantages that the minimum switching loss PWM strategy of the modulation waves synthesized by the bipolar carrier waves and the novel zero-sequence components and the sine waves is adopted, the defect that the traditional DPWM can only realize the minimum switching loss within a specific power factor range is overcome, the switching loss can be further optimized when the power factor range is further reduced, and the DPWM with the minimum switching loss within the full power factor range can be realized.
Drawings
Fig. 1 is a schematic diagram of the algorithm synthesis of bipolar carriers according to the preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the synthesis of the zero sequence voltage component and the sine wave according to the preferred embodiment of the present invention.
Fig. 3A, 3B and 3C are voltage space vector diagrams of sector allocation of the preferred embodiment of the present invention, respectively.
Fig. 4A and 4B are graphs comparing loss characteristics (SLF) of respective PWM modulation methods, respectively.
Fig. 5 is a schematic diagram of an embodiment of the present invention applied to a three-phase inverter.
Detailed Description
The invention discloses a method for minimizing switching loss of a three-phase inverter based on double carrier waves and synthesized modulated waves, and the specific implementation mode of the invention is further described in combination with the preferred embodiment.
Referring to fig. 1 to 5 of the drawings, fig. 1 illustrates a waveform modulation process of a zero sequence component, a sine wave and a bipolar carrier wave of the dual carrier wave and synthesized modulation wave based three-phase inverter minimum switching loss method, fig. 2 illustrates a synthesis schematic diagram of a zero sequence voltage component and a sine wave of the dual carrier wave and synthesized modulation wave based three-phase inverter minimum switching loss method, fig. 3A, fig. 3B and fig. 3C illustrate sector allocation in a voltage space vector diagram, respectively, fig. 4A and fig. 4B illustrate a loss characteristic comparison of the method with a conventional PWM modulation method, respectively, and fig. 5 illustrates a specific embodiment of the dual carrier wave and synthesized modulation wave based three-phase inverter minimum switching loss method applied to a three-phase inverter.
Preferably, the method for minimizing switching loss of the three-phase inverter based on the dual carrier waves and the synthesized modulated wave comprises the following steps:
step S1: superimposing the (new) zero-sequence component on the sinusoidal modulated wave to form a synthesized modulated wave;
step S2: superimposing the synthesized modulated wave on a bipolar carrier to modulate and form a drive signal G (of VSIs)aA drive signal GbAnd a drive signal Gc。
Further, the zero sequence component in step S1 is v0The expression is as follows:
Figure BDA0001979601580000051
wherein:
when in use
Figure BDA0001979601580000052
When x is
Figure BDA0001979601580000053
And
Figure BDA0001979601580000054
maximum value of (1);
when in use
Figure BDA0001979601580000055
In which x modifies the reference signal by three phases
Figure BDA0001979601580000056
And
Figure BDA0001979601580000057
and | v of three-phase symmetric reference signal* a|,|v* bI and | v* cThe median of | is determined together;
wherein:
by introducing power factor angle
Figure BDA0001979601580000058
Three-phase corrected reference signal
Figure BDA0001979601580000059
And
Figure BDA00019796015800000510
from three-phase symmetrical reference signals v* a,、v* b、v* cThe transformation yields:
Figure BDA00019796015800000511
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein M isiIs the modulation degree of the inverter.
Further, the sinusoidal modulation wave in step S1 includes va **、vb **、vc **Sine modulated wave va **、vb **、vc **The expression of (a) is:
Figure BDA00019796015800000512
wherein, three-phase symmetrical reference signal v* a,、v* b、v* cThe expression of (a) is:
Figure BDA0001979601580000061
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein M isiIs the modulation degree of the inverter.
Further, the bipolar carrier wave in step S2 is VtriDriving signal GaA drive signal GbA drive signal GcThe expression of (a) is:
Figure BDA0001979601580000062
further, the bipolar carrier wave in step S2 has + Vtriand-VtriTwo opposite polarities.
Further, the bipolar carrier in step S2 is embodied as a bipolar triangular carrier.
Wherein the bipolar triangular carrier has + Vtriand-VtriTwo opposite polarities.
According to the preferred embodiment, the invention discloses a method for minimizing switching loss of a three-phase inverter based on dual carrier waves and synthesized modulated waves, and the working principle of the method is explained as follows.
Specifically, a novel zero sequence component is superimposed on a sinusoidal modulation wave, a bipolar carrier is introduced at the same time, and then modulation is performed, and the modulation process is specifically shown in fig. 1. The calculation of the zero sequence component is shown in the following formulas (1) to (3), and a schematic diagram of synthesizing a novel modulation wave with a sine wave after the zero sequence component is calculated is shown in fig. 2.
Specifically, the process of generating the driving signals Ga, Gb, and Gc of the VSIs is as shown in fig. 1. Different from the traditional unipolar carrier wave PWM modulation technology and DPWM technology, the carrier wave of the invention patent application has + Vtriand-VtriTwo opposite polarities. Modulation to which the present patent application relatesWave va **,vb **And vc **The expression of (2) is shown in formula (1). Wherein, V1m＝Mi× (2 Vdc/pi) represents the amplitude of the reference voltage, MiIndicating the degree of modulation, ω, of the inverterN＝2πfNRepresenting the nominal angular velocity of the output waveform.
Figure BDA0001979601580000071
By introducing power factor angle
Figure BDA0001979601580000072
Three-phase symmetrical reference signal v* a,v* bAnd v* cConverting to obtain three-phase corrected reference signal
Figure BDA0001979601580000073
And
Figure BDA0001979601580000074
Figure BDA0001979601580000075
according to formula (1) and formula (2), v0The formula (3) and the schematic diagram of the synthesis process are shown in FIG. 2. When in use
Figure BDA0001979601580000076
When x is from
Figure BDA0001979601580000077
And
Figure BDA0001979601580000078
is determined. For example, when
Figure BDA0001979601580000079
Where x is a. When in use
Figure BDA00019796015800000710
X corrects the reference signal by three phases
Figure BDA00019796015800000711
And
Figure BDA00019796015800000712
and three-phase reference signal | v* a|,|v* bI and | v* cThe median of | is determined jointly. For example, when | v* b|≤|v* a|≤|v* cL, < or >
Figure BDA00019796015800000713
When x is a. The sector assignment in the voltage space vector diagram of this method is shown in fig. 3A, 3B and 3C. The polarity of the triangular carrier in each sector is shown in table 1 (table 1 is shown in the appendix of this specification in more detail).
Figure BDA00019796015800000714
According toIEEE Transactions on Industry ApplicationsThe switching loss calculation method provided in the document "a High-performance generalized discrete PWM Algorithm" and the document "performance optimization of three-phase voltage source inverter minimum loss PWM Algorithm" in the chinese electro-mechanical engineering report, the switching loss of the three-phase inverter minimum switching loss method disclosed in the present patent application is less than the switching loss of any other discrete modulation method, as shown in fig. 4A and 4B.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Appendix
Table 1 polarity table of triangular carrier in each sector
Figure BDA0001979601580000091

Claims (6)

1. A minimum switching loss method of a three-phase inverter based on double carrier waves and synthesized modulation waves is characterized by comprising the following steps:
step S1: superposing the zero sequence component on the sine modulation wave to form a synthetic modulation wave through modulation;
step S2: the synthesized modulated wave is superposed on a bipolar carrier wave to form a driving signal G by modulationaA drive signal GbAnd a drive signal Gc；
The zero sequence component in step S1 is v0The expression is as follows:
Figure FDA0002411599520000011
wherein:
when in use
Figure FDA0002411599520000012
When x is
Figure FDA0002411599520000013
And
Figure FDA0002411599520000014
maximum value of (1);
when in use
Figure FDA0002411599520000015
In which x modifies the reference signal by three phases
Figure FDA0002411599520000016
And
Figure FDA0002411599520000017
and | v of three-phase symmetric reference signal* a|,|v* bI and | v* cThe median of | is determined together;
wherein:
by introducing power factor angle
Figure FDA0002411599520000018
Three-phase corrected reference signal
Figure FDA0002411599520000019
And
Figure FDA00024115995200000110
from three-phase symmetrical reference signals v* a,、v* b、v* cThe transformation yields:
Figure FDA00024115995200000111
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein M isiIs the modulation degree of the inverter.
2. The method for minimizing switching loss in a three-phase inverter based on dual carrier waves and synthesized modulated waves as claimed in claim 1, wherein the sinusoidal modulated wave in step S1 includes va **、vb **、vc **Sine modulated wave va **、vb **、vc **The expression of (a) is:
Figure FDA0002411599520000021
wherein, three-phase symmetrical reference signal v* a,、v* b、v* cThe expression of (a) is:
Figure FDA0002411599520000022
wherein, ω isNThe expression is the rated angular speed of the output waveform;
ωN＝2πfN；
wherein, V1mThe amplitude of the reference voltage is expressed as:
V1m＝Mi×(2Vdc/π)；
wherein M isiIs the modulation degree of the inverter.
3. The method for minimizing switching loss of a three-phase inverter based on dual carrier waves and synthesized modulated waves as claimed in claim 2, wherein the bipolar carrier wave in step S2 is VtriDriving signal GaA drive signal GbA drive signal GcThe expression of (a) is:
Figure FDA0002411599520000023
4. the dual carrier and synthesized modulated wave based three-phase inverter minimum switching loss method according to claim 3, wherein the bipolar carrier in step S2 has two opposite polarities of + Vtr and-Vtr.
5. The dual carrier and composite modulated wave based three-phase inverter minimum switching loss method as claimed in claim 3, wherein the bipolar carrier in step S2 is embodied as a bipolar triangular carrier.
6. Root of herbaceous plantThe method of claim 5, wherein the bipolar triangular carrier has + Vtriand-VtriTwo opposite polarities.
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