CN115622436B - Inverter circuit control method and device and inverter module - Google Patents
Inverter circuit control method and device and inverter module Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
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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
- H02M1/123—Suppression of common mode voltage or current
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Abstract
The invention provides an inverter circuit control method, an inverter circuit control device and an inverter module, and relates to the field of circuit control. The method comprises the following steps: determining a non-zero voltage vector of a target spatial angular region; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector; and generating a control signal according to the waveform control parameter to control the state of the inverter circuit, thereby effectively reducing the common-mode voltage.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to an inverter circuit control method, an inverter circuit control device and an inverter module.
Background
The inverter is a converter for converting direct current electric energy into constant-frequency constant-voltage or frequency-Modulation voltage-regulation alternating current, the PWM (pulse width Modulation) rectifier is a power converter developed by applying a pulse width Modulation technology, the inverter and the PWM rectifier are widely applied in various industries and fields, the control of the inverter becomes very important, and the inverter or the PWM rectifier can be controlled by adopting a pulse width Modulation signal.
In the related art, space Vector Pulse Width Modulation (SVPWM) takes an ideal flux linkage circle of a stator of a three-phase symmetric motor as a reference standard when three-phase symmetric sine-wave voltage is supplied with power, and performs appropriate switching in different switching modes of a three-phase inverter to obtain a Pulse width modulation signal; and synthesizing a pulse width modulation signal according to the zero vector and the non-zero vector by adopting SVPWM.
However, in the related art, the synthesized pwm signal controls the inverter, which is prone to cause a problem of high common mode voltage.
Disclosure of Invention
The present invention is directed to an inverter circuit control method, an inverter circuit control device and an inverter module, so as to solve the above technical problems in the related art.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides an inverter circuit control method, including:
determining a non-zero voltage vector of a target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions;
determining the action time of the non-zero voltage vector of the target space angle region;
determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector;
and generating a control signal according to the waveform control parameter so as to control the state of the inverter circuit.
Optionally, the determining a non-zero voltage vector of the target spatial angle region from the non-zero voltage vectors of the plurality of spatial angle regions includes:
if the target space angle region is the first space angle region, determining N1 non-zero voltage vectors with the first space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, wherein the N1 non-zero voltage vectors are the non-zero voltage vectors of the first space angle region;
if the target space angle region is the second space angle region, determining N2-1 non-zero voltage vectors with the second space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, and determining one remaining non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle region.
Optionally, the N1 non-zero voltage vectors centered at the first spatial angular region include: two non-zero voltage vectors constituting the first spatial angular region, and other non-zero voltage vectors adjacent to the two non-zero voltage vectors;
the N2-1 non-zero voltage vectors centered at the second spatial angular region include: two non-zero voltage vectors constituting the second spatial angular region.
Optionally, the angle range of the first spatial angle region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
Optionally, if the target spatial angle region is the first spatial angle region, the determining the action time of the non-zero voltage vector of the target spatial angle region includes:
determining action time of two adjacent non-zero voltage vectors in the first space angle region as T1 and T2 respectively in the non-zero voltage vectors in the first space angle region;
and determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the first spatial angle region to be one half of T0, wherein T0=1-T1-T2.
Optionally, if the target space angle region is the second space angle region, the determining the acting time of the non-zero voltage vector of the target space angle region includes:
determining action time of two adjacent non-zero voltage vectors in the second space angle region as T1 and T2 in the non-zero voltage vectors in the second space angle region;
determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the second space angle region to be one half of T0;
and adjusting the action time of a non-zero voltage vector which is 180 degrees different from the other non-zero voltage vectors in the two non-zero voltage vectors to be T1 plus one half of T0, or T2 plus one half of T0.
In a second aspect, an embodiment of the present invention further provides an inverter circuit control method, including:
determining a non-zero voltage vector of the target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions;
determining the action time of the non-zero voltage vector of the target space angle region;
determining a control signal according to the non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector, so as to control the state of an inverter circuit;
the control signal is determined by comparing three-phase triangular carriers with three-phase modulation waves, the phase difference between one phase of the three-phase triangular carrier and the other two phases of the three-phase triangular carrier is a preset angle, and the preset angle is determined according to the non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector.
Optionally, the preset angle is 180 degrees, and the three-phase modulation wave includes a three-phase sine wave with a phase difference of 120 degrees.
In a third aspect, an embodiment of the present invention further provides an inverter circuit control device, including:
a determining module, configured to determine a non-zero voltage vector of the target spatial angle region from non-zero voltage vectors of a plurality of spatial angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector;
and the generating module is used for generating a control signal according to the waveform control parameter so as to control the state of the inverter circuit.
Optionally, the determining module is specifically configured to determine, if the target spatial angle region is the first spatial angle region, N1 nonzero voltage vectors centered around the first spatial angle region from the nonzero voltage vectors of the multiple spatial angle regions, where the N1 nonzero voltage vectors are the nonzero voltage vector of the first spatial angle region; if the target space angle region is the second space angle region, determining N2-1 non-zero voltage vectors with the second space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, and determining one remaining non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle region.
Optionally, the N1 non-zero voltage vectors centered at the first spatial angular region include: two non-zero voltage vectors constituting the first spatial angular region, and other non-zero voltage vectors adjacent to the two non-zero voltage vectors;
the N2-1 non-zero voltage vectors centered at the second spatial angular region include: two non-zero voltage vectors constituting the second spatial angular region.
Optionally, the angle range of the first spatial angle region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
Optionally, if the target spatial angle region is the first spatial angle region, the determining module is specifically configured to determine that, in the non-zero voltage vectors of the first spatial angle region, action times of two adjacent non-zero voltage vectors of the first spatial angle region are T1 and T2, respectively; and determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the first spatial angle region to be one half of T0, wherein T0=1-T1-T2.
Optionally, if the target spatial angle region is the second spatial angle region, the determining module is specifically configured to determine that, in the non-zero voltage vectors of the second spatial angle region, action times of two adjacent non-zero voltage vectors of the second spatial angle region are T1 and T2; determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the second space angle region to be one half of T0; and adjusting the action time of a non-zero voltage vector which is 180 degrees different from the other non-zero voltage vectors in the two non-zero voltage vectors to be T1 plus one half of T0, or T2 plus one half of T0.
In a fourth aspect, an embodiment of the present invention further provides an inverter module, including: the inverter circuit is connected with the controller;
the controller includes: a memory and a processor, wherein the memory stores a computer program executable by the processor, and the processor implements the inverter circuit control method according to any one of the first and second aspects when executing the computer program, and outputs the control signal to the inverter circuit to control a switching state of the inverter circuit.
The invention has the beneficial effects that: the embodiment of the application provides an inverter circuit control method, which comprises the following steps: determining a non-zero voltage vector of a target space angle region from the non-zero voltage vectors of the plurality of space angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the non-zero voltage vector of the target space angle region and the action time of the non-zero voltage vector; and generating a control signal according to the waveform control parameter so as to control the state of the inverter circuit. The non-zero voltage vectors of the target space angle region are adopted when the control signal is generated, moreover, the target space angle region can be a first space angle region or a second space angle region in a plurality of space angle regions, the number of the non-zero voltage vectors of the first space angle region is larger than that of the non-zero voltage vectors of the second space angle region, and the common-mode voltage can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a first schematic flowchart of an inverter circuit control method according to an embodiment of the present disclosure;
FIG. 2 is a first schematic diagram of a plurality of spatial angular regions according to an embodiment of the present disclosure;
fig. 3 is a second schematic diagram of a plurality of spatial angle regions according to an embodiment of the present disclosure;
fig. 4 is a third schematic view of a plurality of spatial angle regions provided in the embodiment of the present application;
FIG. 5 is a fourth schematic view of a plurality of spatial corner regions provided by an embodiment of the present application;
fig. 6 is a second flowchart illustrating an inverter circuit control method according to an embodiment of the present disclosure;
fig. 7 is a third schematic flowchart of an inverter circuit control method according to an embodiment of the present disclosure;
fig. 8 is a fourth schematic flowchart of a control method of an inverter circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a wave-sending mode of a first sector according to an embodiment of the present application;
fig. 10 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 1 according to an embodiment of the present application;
fig. 11 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 2 according to an embodiment of the present application;
fig. 12 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 3 according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of an inverter circuit according to an embodiment of the present disclosure;
fig. 14 is a schematic structural diagram of an inverter circuit control device according to an embodiment of the present disclosure;
fig. 15 is a schematic structural diagram of an inverter module according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it should be noted that if the terms "upper", "lower", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the application is used, the description is only for convenience of describing the application and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the application.
Furthermore, the terms first, second and the like in the description and in the claims, as well as in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
In the related technology, SVPWM takes an ideal flux linkage circle of a stator of a three-phase symmetrical motor as a reference standard when three-phase symmetrical sine-wave voltage is used for supplying power, and different switching modes of a three-phase inverter are properly switched to obtain a pulse width modulation signal; and synthesizing a Pulse Width Modulation signal according to the zero Vector and the non-zero Vector by adopting Space Vector Pulse Width Modulation (SVPWM). However, in the related art, the synthesized pwm signal controls the inverter, which is prone to cause a problem of high common mode voltage.
In view of the above technical problems in the related art, an embodiment of the present application provides an inverter circuit control method, where a non-zero voltage vector of a target spatial angle region is used when a control signal is generated, and the target spatial angle region may be a first spatial angle region or a second spatial angle region of a plurality of spatial angle regions, where the number of the non-zero voltage vectors of the first spatial angle region is greater than the number of the non-zero voltage vectors of the second spatial angle region, so as to effectively reduce a common-mode voltage.
The following explains a control method of an inverter circuit provided in an embodiment of the present application.
Fig. 1 is a first schematic flow chart of an inverter circuit control method according to an embodiment of the present disclosure, as shown in fig. 1, the method may include:
s101, determining a non-zero voltage vector of a target space angle region from the non-zero voltage vectors of the plurality of space angle regions.
The target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are arranged between every two first space angle regions.
In some embodiments, at least one spatial angular region of the plurality of spatial angular regions may be used as a target spatial angular region according to actual requirements, and the number of the target spatial angular regions may be at least one. If the number of the target space angle regions is multiple, a corresponding non-zero voltage vector needs to be determined for each target space angle region.
In this embodiment of the present application, if the target space angle region is the first space angle region, the number of non-zero voltage vectors of the target space angle region is the first number N1; if the target space angle region is the second space angle region, the number of the non-zero voltage vectors of the target space angle region is the second number N2.
It should be noted that the plurality of spatial angle regions may include a plurality of first spatial angle regions and a plurality of second spatial angle regions, where the number of first spatial angle regions may be smaller than the number of second spatial angle regions.
And S102, determining the acting time of the non-zero voltage vector of the target space angle region.
Wherein, the number of the non-zero voltage vectors of the target space angle region can be multiple.
It should be noted that the acting time of each non-zero voltage vector in the target spatial angle region may be sequentially determined, or the acting time of each non-zero voltage vector in the target spatial angle region may be simultaneously determined, which is not specifically limited in the embodiment of the present application.
S103, determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the acting time of the nonzero voltage vector.
And S104, generating a control signal according to the waveform control parameter to control the state of the inverter circuit.
In some embodiments, a preset application program may be adopted to determine the waveform control parameter according to the nonzero voltage vector of the target spatial angular region and the acting time of the nonzero voltage vector; generating a control signal according to the waveform control parameter, and outputting the control signal to an inverter circuit; the inverter circuit may control a state of the inverter circuit according to the control signal.
Optionally, the control signal may also be output to a PWM rectification circuit, and the PWM rectification circuit may control the state of the PWM rectification circuit according to the control signal.
Alternatively, the predetermined application may be a DSP (digital signal Processing) application. Of course, other types of application programs may also be used, and the embodiment of the present application is not limited to this specifically.
To sum up, the embodiment of the present application provides an inverter circuit control method, including: determining a non-zero voltage vector of a target space angle region from the non-zero voltage vectors of the plurality of space angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the non-zero voltage vector of the target space angle region and the action time of the non-zero voltage vector; and generating a control signal according to the waveform control parameter so as to control the state of the inverter circuit. The non-zero voltage vectors of the target space angle region are adopted when the control signal is generated, moreover, the target space angle region can be a first space angle region or a second space angle region in a plurality of space angle regions, the number of the non-zero voltage vectors of the first space angle region is larger than that of the non-zero voltage vectors of the second space angle region, and the common-mode voltage can be effectively reduced.
In the above step S101, the process of determining a non-zero voltage vector of a target spatial angle region from the non-zero voltage vectors of a plurality of spatial angle regions may include:
if the target space angle region is a first space angle region, determining N1 non-zero voltage vectors taking the first space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, wherein the N1 non-zero voltage vectors are the non-zero voltage vectors of the first space angle region;
if the target space angle area is a second space angle area, determining N2-1 non-zero voltage vectors taking the second space angle area as the center from the non-zero voltage vectors of the plurality of space angle areas, and determining one rest non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle area.
It should be noted that any non-zero voltage vector in the non-zero voltage vectors may be deflected by 180 degrees counterclockwise to obtain one remaining non-zero voltage vector in the second spatial angle region, and any non-zero voltage vector in the non-zero voltage vectors may also be deflected by 180 degrees clockwise to obtain one remaining non-zero voltage vector in the second spatial angle region, which is not specifically limited in this embodiment of the application.
Fig. 2 is a first schematic diagram of a plurality of spatial angle regions provided in an embodiment of the present application, as shown in fig. 2, the plurality of spatial angle regions may form a circle, the number of spatial angle regions may be 6, each spatial angle region may also be referred to as a sector, and each spatial angle region may be formed by two voltage vectors.
In the embodiment of the present application, the non-zero voltage vector centered on the spatial angle region may refer to non-zero voltage vectors distributed on two sides of the spatial angle region, and the non-zero voltage vectors are symmetrically distributed along the spatial angle region. As shown in fig. 2, for the spatial angle region I, for example, the non-zero voltage vectors corresponding to the spatial angle region I may be U4, U6; or U2, U5; or U4, U6, U2, U5.
Optionally, the N1 non-zero voltage vectors centered at the first spatial angular region include: two non-zero voltage vectors constituting a first spatial angular region, and other non-zero voltage vectors adjacent to the two non-zero voltage vectors; n2-1 non-zero voltage vectors centered on a second spatial angular region, comprising: two non-zero voltage vectors constituting a second spatial angular region.
Wherein the non-zero voltage vector of the second spatial angle region comprises: two non-zero voltage vectors forming a first spatial angular region, and one remaining non-zero voltage vector obtained by deflecting any one of the two non-zero voltage vectors by 180 degrees.
In some embodiments, N1=4, that is, the number of non-zero voltage vectors corresponding to the first spatial angular region may be 4; n2-1=2, N2=3, i.e. the number of non-zero voltage vectors corresponding to the second spatial angular region may be 3.
For example, as shown in fig. 2, if the spatial angle area I is the first spatial angle area, the non-zero voltage vector corresponding to the spatial angle area I may be 4 non-zero voltage vectors U4, U6, U2, and U5. If the space angle region II is the second space angle region, the non-zero voltage vector corresponding to the space angle region II may be 3 non-zero voltage vectors U6, U2, and U5.
It should be noted that, as shown in fig. 2, the spatial angle region I may be referred to as a first sector, the spatial angle region II may be referred to as a second sector, the spatial angle region III may be referred to as a third sector, the spatial angle region IV may be referred to as a fourth sector, the spatial angle region V may be referred to as a fifth sector, and the spatial angle region VI may be referred to as a sixth sector.
In the embodiment of the application, the nonzero voltage vectors corresponding to each spatial angular region have a certain sequencing order, and may be sequentially arranged based on a clockwise direction or a counterclockwise direction.
Optionally, the angular range of the first spatial angular region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
In some embodiments, the angular extent of the first spatial angular region is: 0-60 degrees and 180-240 degrees, meaning that the first spatial angular region may comprise: a first sector (spatial angular region I) and a fourth sector (spatial angular region IV); the angular range of the second spatial angular region is: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees, meaning that the first spatial angular region may include: a second sector (spatial angle region II), a third sector (spatial angle region III), a fifth sector (spatial angle region V), and a sixth sector (spatial angle region VI).
Fig. 3 is a second schematic diagram of a plurality of spatial angular regions provided in an embodiment of the present application, and as shown in fig. 3 (a), a plurality of non-zero voltage vectors corresponding to the first sector may include: u2, U6, U4, U5 (clockwise); as shown in fig. 3 (b), the plurality of non-zero voltage vectors corresponding to the second sector may include: u2, U6, U5 (clockwise); as shown in fig. 3 (c), the plurality of non-zero voltage vectors corresponding to the third sector may include: u2, U3, U5 (counterclockwise); as shown in fig. 3 (d), the plurality of non-zero voltage vectors corresponding to the fourth sector may include: u2, U3, U1, U5 (counterclockwise); as shown in (e) of fig. 3, the plurality of non-zero voltage vectors corresponding to the fifth sector may include: u2, U1, U5 (counterclockwise); as shown in (f) of fig. 3, the plurality of non-zero voltage vectors corresponding to the sixth sector may include: u2, U4, U5 (clockwise).
In other embodiments, the angular extent of the first spatial angular region is: 120-180 degrees and 300-360 degrees, meaning that the first spatial angular region may comprise: a third sector (spatial angular region III) and a sixth sector (spatial angular region VI). The angular range of the second spatial angular region is: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees, meaning that the second spatial angular region may include: a first sector (spatial angular region I), a second sector (spatial angular region II), a fourth sector (spatial angular region IV), and a fifth sector (spatial angular region V).
Fig. 4 is a third schematic diagram of a plurality of spatial angular regions provided in an embodiment of the present application, and as shown in fig. 4 (a), a plurality of non-zero voltage vectors corresponding to the first sector may include: u1, U4, U6; as shown in fig. 4 (b), the plurality of non-zero voltage vectors corresponding to the second sector may include: u1, U2, U6; as shown in fig. 4 (c), the plurality of non-zero voltage vectors corresponding to the third sector may include: u1, U3, U2, U6; as shown in (d) of fig. 4, the plurality of non-zero voltage vectors corresponding to the fourth sector may include: u1, U3, U6; as shown in (e) of fig. 4, the plurality of non-zero voltage vectors corresponding to the fifth sector may include: u1, U5, U6; as shown in fig. 4 (f), the plurality of non-zero voltage vectors corresponding to the sixth sector area may include: u1, U5, U4 and U6.
In some embodiments, the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, meaning that the first spatial angular region may include: a second sector (spatial angular region II) and a fifth sector (spatial angular region V); the angular range of the second spatial angular region is: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees, meaning that the second spatial angular region may include: a first sector (spatial angular region I), a third sector (spatial angular region III), a fourth sector (spatial angular region IV), and a sixth sector (spatial angular region VI).
Fig. 5 is a fourth schematic view of a plurality of spatial angular regions according to an embodiment of the present application, and as shown in fig. 5 (a), a plurality of non-zero voltage vectors corresponding to a first sector may include: u4, U6, U3; as shown in fig. 5 (b), the plurality of non-zero voltage vectors corresponding to the second sector may include: u4, U6, U2, U3; as shown in fig. 5 (c), the plurality of non-zero voltage vectors corresponding to the third sector may include: u4, U2, U3; as shown in (d) of fig. 5, the plurality of non-zero voltage vectors corresponding to the fourth sector may include: u4, U1, U3; as shown in (e) of fig. 5, the plurality of non-zero voltage vectors corresponding to the fifth sector may include: u4, U5, U1, U3; as shown in fig. 5 (f), the plurality of non-zero voltage vectors corresponding to the sixth sector area may include: u4, U5 and U3.
Fig. 6 is a second flowchart of the inverter circuit control method according to an embodiment of the present application, and as shown in fig. 6, if the target spatial angle area is the first spatial angle area, the process of determining the acting time of the non-zero voltage vector in the target spatial angle area in step S102 may include:
s601, determining action time of two adjacent non-zero voltage vectors in a first space angle region as T1 and T2 respectively in the non-zero voltage vectors in the first space angle region.
S602, determining the action time of other non-zero voltage vectors in the first space angle area to be one half of T0.
Wherein T0= 1-T2.
In some embodiments, the number of the non-zero voltage vectors corresponding to the first spatial angle region may be 4, the action time of two adjacent non-zero voltage vectors in the first spatial angle region is T1 and T2, respectively, and the action time of the other two non-zero voltage vectors is half of T0, i.e., T0/2, respectively.
Optionally, fig. 7 is a schematic flowchart of a third method for controlling an inverter circuit according to an embodiment of the present application, as shown in fig. 7, if the target space angle region is a second space angle region, the process of determining the acting time of the non-zero voltage vector of the target space angle region in S102 may include:
s701, determining action time of two adjacent non-zero voltage vectors in a second space angle region as T1 and T2 in the non-zero voltage vectors in the second space angle region.
S702, determining that the action time of other non-zero voltage vectors in the second space angle area is one half of T0.
And S703, adjusting the action time of the non-zero voltage vector which is 180 degrees different from other non-zero voltage vectors in the two non-zero voltage vectors to be one half of T1 plus T0 or one half of T2 plus T0.
In some embodiments, the number of the non-zero voltage vectors corresponding to the second spatial angle region may be 3, the action time of two non-zero voltage vectors constituting the second spatial angle region is T1 and T2, the other non-zero voltage vectors may be the remaining one voltage vector, the action time of the remaining one voltage vector is T0/2, and the action time of the non-zero voltage vector which is different from the remaining one voltage vector by 180 degrees is T1+ T0/2, or T2+ T0/2.
By way of example, the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees. The plurality of non-zero voltage vectors for the fifth sector may include: u4, U5, U1 and U3, the action time of U1 can be T1, the action time of U5 can be T2, the action time of U0 replaced by U3 can be T0/2, and the action time of U7 replaced by U4 can be T0/2. The plurality of non-zero voltage vectors for the fourth sector may include: u4, U1 and U3, the action time of U1 can be T1, the action time of U3 can be T2, the action time of U4 can be T0/2, and the action time of U3 which is 180 degrees opposite to U4 can be T2+ T0/2.
Fig. 8 is a fourth schematic flowchart of a method for controlling an inverter circuit according to an embodiment of the present disclosure, as shown in fig. 8, the method may include:
s801, determining a non-zero voltage vector of a target space angle region from the non-zero voltage vectors of the plurality of space angle regions.
The target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are arranged between every two first space angle regions.
S802, determining the acting time of the non-zero voltage vector of the target space angle area.
It should be noted that the processes of S801 to S802 are similar to the processes of S101 to S102, and are not described again here.
S803, determining a control signal according to the non-zero voltage vector of the target space angle region and the action time of the non-zero voltage vector, so as to control the state of the inverter circuit;
the control signal is determined by comparing three-phase triangular carrier waves with three-phase modulation waves, the phase difference between one phase of triangular carrier waves in the three-phase triangular carrier waves and the phase difference between the other two phase of triangular carrier waves is a preset angle, and the preset angle is determined according to the non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector.
In some embodiments, whether each phase in the three-phase triangular carrier wave is shifted by a preset degree or not can be determined according to the non-zero voltage vector of the target space angle region and the acting time of the non-zero voltage vector, the equivalent duty ratio can be calculated, and the control signal can be determined according to the comparison between the three-phase triangular carrier wave and the three-phase modulation wave.
It should be noted that, an analog circuit may be used to simulate a three-phase triangular carrier wave and a three-phase modulated wave, and then the three-phase triangular carrier wave and the three-phase modulated wave are compared to determine the control signal.
To sum up, the embodiment of the present application provides an inverter circuit control method, including: determining a non-zero voltage vector of a target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are arranged between every two first space angle regions; determining the action time of a non-zero voltage vector of a target space angle region; determining a control signal according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector so as to control the state of the inverter circuit; the control signal is determined by comparing three-phase triangular carrier waves with three-phase modulation waves, the phase difference between one phase of triangular carrier waves in the three-phase triangular carrier waves and the phase difference between the other two phase of triangular carrier waves is a preset angle, and the preset angle is determined according to the non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector. The non-zero voltage vectors of the target space angle region are adopted when the control signal is generated, the target space angle region can be a first space angle region or a second space angle region in a plurality of space angle regions, the number of the non-zero voltage vectors of the first space angle region is larger than that of the non-zero voltage vectors of the second space angle region, and the common-mode voltage can be effectively reduced.
Moreover, the control signal is determined by comparing the three-phase triangular carrier wave with the three-phase modulation wave, and the phase difference between one phase of the three-phase triangular carrier wave and the other two-phase triangular carrier wave is a preset angle, so that the determination mode of the control signal is more flexible.
Optionally, the preset angle is 180 degrees, and the three-phase modulation wave includes a three-phase sine wave with a phase difference of 120 degrees.
In some embodiments, the angular extent of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees. Multiple non-zero electricity corresponding to the first sectorThe pressure vector may include: the action time of U2, U6, U4 and U5 and U4 can be T1, the action time of U6 can be T2, the action time of U3 can be T0/2, and the action time of U4 which is 180 degrees relative to U3 is adjusted from T1 to T1+ T0/2. Fig. 9 is a schematic diagram of a wave-generating manner of a first sector according to an embodiment of the present application, as shown in (a) and (b) of fig. 9, and T of (a) and (b) of fig. 9 ON1 、T ON2 、T ON3 The modulated wave is shown, the modulated PWM wave is shown as A, B and C, and the action time is shown as T1 and T2. It can be seen that phase a is equivalent to shifting the triangular carrier 180 degrees or reversing the comparative polarity when the comparative polarity is unchanged on the original basis.
In the examples of the present application, scheme 1: the angular range of the first spatial angular region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
scheme 2: the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
scheme 3: the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region is: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
In the schemes 1, 2 and 3, the triangular carrier of one phase is moved by 180 degrees and is unchanged only on the basis of the original SVPWM modulation wave, and the switching sequences of all phases are generated through comparison. In the scheme 1, the phase-B triangular carrier wave moves by 180 degrees unchanged, the scheme 2 is that the phase-C triangular carrier wave moves by 180 degrees unchanged, and the scheme 3 is that the phase-A triangular carrier wave moves by 180 degrees unchanged. The method is simple and easy to implement, and the triangular carrier does not need to be frequently shifted in phase in the ABC three phases. According to the vector action and the carrier wave movement 180 degrees are equivalent, namely the three-phase which is not frequently changed, according to the vector synthesis scheme, the vector is obtained by simply moving any one-phase triangular carrier wave of ABC 180 degrees on the basis of the original SVPWM modulation wave.
Fig. 10 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 1 provided in the embodiment of the present application, and as shown in fig. 10, a B-phase triangular carrier moves by 180 degrees and is unchanged; fig. 11 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 2 provided in the embodiment of the present application, and as shown in fig. 11, a C-phase triangular carrier moves by 180 degrees and is unchanged; fig. 12 is a schematic diagram of a three-phase triangular carrier corresponding to scheme 3 provided in the embodiment of the present application, and as shown in fig. 12, an a-phase triangular carrier moves by 180 degrees and is unchanged.
In the embodiment of the application, the SVPWM modulation can also be realized by a seven-segment method, or can be directly generated by a scheme of analog synthesis (mathematical synthesis), and the sector and the action time do not need to be judged, so that the SVPWM modulation is more convenient and faster. When three-phase sine modulation is carried out, bipolar wave emission modulation is adopted, and the amplitude and phase difference of three-phase modulation waves is 120 degrees:
where ω is an angular velocity, t is time, and an included angle after the ω angular velocity moves by t time is ω t.
Is a phase sine wave expression, and>
is a sine wave expression of phase b, < >>
Is a sine wave expression of c phase, and M is defined as a modulation ratio, namely the ratio of the amplitude of a sine wave modulation wave to the amplitude of a triangular carrier wave.
For bipolar wave generation, upper tube wave generation duty ratio of single bridge arm
To adoptAfter SVPWM modulation, equivalently superposing zero-sequence components: />
。
Wherein,
SVPWM modulated wave being a phase>
Is a B-phase SVPWM modulated wave, is greater than or equal to>
Is a c-phase SVPWM modulated wave.
Through calculation and analysis, the maximum value of the sum of the duty ratios of any two phases of the SVPWM is theoretically deduced to be less than 1.75; however, the sum of the maximum and minimum values is always 0, and the minimum and median values are less than or equal to 0. For example, -30 degrees to 30 degrees, phase A instantaneous value is centered, phase C instantaneous value is maximum, phase B instantaneous value is minimum, therefore
，/>
，
。
If any phase is staggered by 180 degrees and the sum of the duty ratios of the two phases (maximum and minimum, middle and minimum) is less than 1, 111 and 000 can be satisfied, i.e. there is no common mode voltage with 1/2 amplitude, and only 1/6 amplitude is common mode.
In this embodiment of the present application, a control signal is generated to control a state of an inverter circuit, and fig. 13 is a schematic structural diagram of the inverter circuit provided in the embodiment of the present application, as shown in fig. 13, the inverter circuit may be a three-phase bridge arm inverter topology, and the inverter circuit includes: three-phase inductors LA, LB, LC, mos (MOSFET, metal-oxide semiconductor field effect transistor) tubes Q1, Q2, Q3, Q4, Q5, Q6, capacitors C1, C2, C3, C4, C5, and the connection relationship of the respective devices may be as shown in fig. 10.
The three-phase bridge arm inversion topology has the advantages that an input alternating current line reference point is related to PE, the far end of an N line is connected with the PE, and the potential of the N line is considered to be equal to the potential of the PE. The voltage of the bus or the midpoint of the bus on the dc side with respect to the PE is defined as the inverter common mode voltage, and the voltage difference between the positive bus and the negative bus is the bus voltage, and therefore corresponds to the dc component. For the system, the ac component acts more significantly than the dc component, especially the high frequency ac component. The bus midpoint N' defines a common mode voltage with respect to N, and since attention is generally paid to its alternating current component, i.e. the variation value, the common mode amplitude is characterized in terms of amplitude, twice the amplitude being the peak-to-peak value. In this case, a capacitor may be used instead of C4 and C5, in which case the bus midpoint N' is a virtual point.
In the inverter, the high-frequency component refers to voltage change caused by switching action, and the common-mode voltage cannot be directly calculated and needs to be calculated according to the differential-mode voltage. Obviously, each bridge of the three-phase bridge has a switching action, the upper tube and the lower tube are conducted complementarily, when the upper tube is conducted, the output voltage of a node is Vdc relative to the voltage of the negative bus, otherwise, the conduction of the lower tube is 0; if the tube conduction is 0.5Vdc for N', the tube conduction is-0.5 Vdc. Thus defining the switching function:
thus, phaseThe differential mode voltage to the midpoint of the bus can be expressed as
The voltage relative to the negative bus can be expressed as
. The general three-phase circuit has symmetrical parameters, and the voltage difference of N lines relative to N' is
. It is understood that the instantaneous average of the three-phase differential mode voltages is the common mode voltage. Wherein, each phase has two states, three phases total 8 states, each state corresponds to a space vector, and slave->
To>
The common mode voltage for each switch state or space vector is shown in table 1 below.
TABLE 1
It can be seen from the table that the corresponding common mode voltage for each switching state is not identical, but a rule can be found with a maximum amplitude of 1/2Vdc followed by 1/6 dc. To achieve a one-sixth common mode effect, the two zero vectors can be removed. In the related art, AZSVPWM (improved equivalent zero vector pulse width modulation) synthesizes a zero vector by using a non-zero voltage vector, and generally, for example, adjacent four vectors, virtual vector synthesis and the like are required to calculate an equivalent wave-generating quantity and determine a carrier phase or a comparative polarity in each sector, which is relatively complex. In the embodiment of the application, a vector synthesis mode of three schemes is provided, a certain vector conversion relation is utilized, the effect that three-phase triangular carriers are kept constant in a full-range sector is ensured, and the phase of the triangular carriers does not need to be changed or the polarity of the triangular carriers is not needed to be inverted.
To sum up, the embodiment of the present application provides an inverter circuit control method, which is a feasible non-zero voltage vector synthesis manner according to a specific four-vector and three-vector synthesis scheme; the three-phase carrier wave keeps fixed in six sectors without switching phases; the synthesis scheme has three types according to sectors, and the three types correspond to three carrier phase relations. According to the traditional SVPWM modulation or calculation result, directly comparing with a triangular carrier to obtain the PWM (pulse width modulation) of each phase; the amplitude of the common mode voltage is reduced to 1/6 from the original 1/2 due to the adoption of a non-zero voltage vector. Reverse verification shifts the phase 180 degrees according to the single-phase carrier wave, and zero vectors do not exist in mathematical calculation. The method is easy to realize, does not need to frequently change the phase, can reduce the common-mode voltage, and is more suitable for analog control.
The following describes an inverter circuit control apparatus, an inverter module, a storage medium, and the like for executing the inverter circuit control method provided in the present application, and for specific implementation processes and technical effects thereof, reference is made to the related contents of the inverter module method, which is not described in detail below.
Fig. 14 is a schematic structural diagram of an inverter circuit control apparatus according to an embodiment of the present application, and as shown in fig. 14, the apparatus may include:
a determining module 1201, configured to determine a non-zero voltage vector of the target spatial angle region from non-zero voltage vectors of a plurality of spatial angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector;
a generating module 1202, configured to generate a control signal according to the waveform control parameter, so as to control a state of the inverter circuit.
Optionally, the determining module 1201 is specifically configured to determine, if the target spatial angle area is the first spatial angle area, N1 nonzero voltage vectors centered around the first spatial angle area from the nonzero voltage vectors of the multiple spatial angle areas, and the N1 nonzero voltage vectors are the nonzero voltage vectors of the first spatial angle area; if the target space angle region is the second space angle region, determining N2-1 non-zero voltage vectors with the second space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, and determining one remaining non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle region.
Optionally, the N1 non-zero voltage vectors centered at the first spatial angular region include: two non-zero voltage vectors constituting the first spatial angular region, and other non-zero voltage vectors adjacent to the two non-zero voltage vectors;
the N2-1 non-zero voltage vectors centered at the second spatial angular region include: two non-zero voltage vectors constituting the second spatial angular region.
Optionally, the angle range of the first spatial angle region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
Optionally, if the target spatial angle region is the first spatial angle region, the determining module 1201 is specifically configured to determine that, in the non-zero voltage vectors of the first spatial angle region, action times of two adjacent non-zero voltage vectors of the first spatial angle region are T1 and T2, respectively; and determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the first spatial angle region to be one half of T0, wherein T0=1-T1-T2.
Optionally, if the target spatial angle region is the second spatial angle region, the determining module 1201 is specifically configured to determine that, in the non-zero voltage vectors of the second spatial angle region, action times of two adjacent non-zero voltage vectors of the second spatial angle region are T1 and T2; determining the action time of other non-zero voltage vectors in the non-zero voltage vectors of the second space angle region to be one half of T0; and adjusting the action time of a non-zero voltage vector which is 180 degrees different from the other non-zero voltage vectors in the two non-zero voltage vectors to be T1 plus one half of T0, or T2 plus one half of T0.
The embodiment of the present application further provides an inverter circuit control apparatus, which includes:
the determining module is used for determining a non-zero voltage vector of the target space angle region from the non-zero voltage vectors of a plurality of space angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining a control signal according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector so as to control the state of an inverter circuit; the control signal is determined by comparing three-phase triangular carriers with three-phase modulation waves, the phase difference between one phase of the three-phase triangular carrier and the other two phases of the three-phase triangular carrier is a preset angle, and the preset angle is determined according to the non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector.
Optionally, the preset angle is 180 degrees, and the three-phase modulation wave includes a three-phase sine wave with a phase difference of 120 degrees.
The above-mentioned apparatus is used for executing the method provided by the foregoing embodiment, and the implementation principle and technical effect are similar, which are not described herein again.
These above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
Fig. 15 is a schematic structural diagram of an inverter module according to an embodiment of the present application, and as shown in fig. 15, the inverter module includes: an inverter circuit 1301 and a controller 1302, the inverter circuit 1301 being connected to the controller 1302;
the controller 1302 includes: the inverter circuit control method is implemented when the processor 1302b executes the computer program, and the inverter circuit 1301 outputs a control signal to control the switching state of the inverter circuit 1301 to the inverter circuit 1301. The specific implementation and technical effects are similar, and are not described herein again.
Optionally, the invention also provides a program product, for example a computer-readable storage medium, comprising a program which, when being executed by a processor, is adapted to carry out the above-mentioned method embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An inverter circuit control method, comprising:
determining a non-zero voltage vector of a target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions;
determining the action time of the non-zero voltage vector of the target space angle region;
determining waveform control parameters according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector;
generating a control signal according to the waveform control parameter to control the state of an inverter circuit;
the determining a non-zero voltage vector of the target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions comprises:
if the target space angle region is the first space angle region, determining N1 non-zero voltage vectors with the first space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, wherein the N1 non-zero voltage vectors are the non-zero voltage vectors of the first space angle region;
if the target space angle region is the second space angle region, determining N2-1 non-zero voltage vectors with the second space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, and determining one remaining non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle region.
2. The method of claim 1, wherein the N1 non-zero voltage vectors centered at the first spatial angular region comprise: two non-zero voltage vectors constituting the first spatial angular region, and other non-zero voltage vectors adjacent to the two non-zero voltage vectors;
the N2-1 non-zero voltage vectors centered at the second spatial angular region include: two non-zero voltage vectors constituting said second spatial angular region.
3. The method of claim 1, wherein the angular extent of the first spatial angular region is: 0-60 degrees and 180-240 degrees, the angular range of the second spatial angular region being: 60-120 degrees, 120-180 degrees, 240-300 degrees, and 300-360 degrees; or;
the angular range of the first spatial angular region is: 120-180 degrees and 300-360 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 60-120 degrees, 180-240 degrees, and 240-300 degrees; or;
the angular range of the first spatial angular region is: 60-120 degrees and 240-300 degrees, the angular range of the second spatial angular region being: 0-60 degrees, 120-180 degrees, 180-240 degrees, and 300-360 degrees.
4. The method of claim 1, wherein if the target spatial angular region is the first spatial angular region, the determining the action time of the non-zero voltage vector of the target spatial angular region comprises:
determining action time of two adjacent non-zero voltage vectors in the first space angle region as T1 and T2 respectively in the non-zero voltage vectors in the first space angle region;
and determining the action time of other non-zero voltage vectors in the first space angle region to be one half of T0, wherein T0=1-T1-T2.
5. The method of claim 1, wherein if the target spatial angular region is the second spatial angular region, the determining the action time of the non-zero voltage vector of the target spatial angular region comprises:
determining action time of two adjacent non-zero voltage vectors in the second space angle region as T1 and T2 in the non-zero voltage vectors in the second space angle region;
determining the action time of other non-zero voltage vectors in the second space angle area to be one half of T0;
and adjusting the action time of a non-zero voltage vector which is 180 degrees different from the other non-zero voltage vectors in the two non-zero voltage vectors to be T1 plus one half of T0, or T2 plus one half of T0.
6. An inverter circuit control method, comprising:
determining a non-zero voltage vector of a target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions;
determining the action time of the non-zero voltage vector of the target space angle region;
determining a control signal according to the nonzero voltage vector of the target space angle region and the action time of the nonzero voltage vector so as to control the state of an inverter circuit;
the control signal is determined by comparing three-phase triangular carriers with three-phase modulation waves, the phase difference between one phase of the three-phase triangular carrier and the other two phases of the three-phase triangular carrier is a preset angle, and the preset angle is determined according to a non-zero voltage vector of the target space angle area and the action time of the non-zero voltage vector;
the determining a non-zero voltage vector of the target spatial angular region from the non-zero voltage vectors of the plurality of spatial angular regions comprises:
if the target space angle region is the first space angle region, determining N1 non-zero voltage vectors with the first space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, wherein the N1 non-zero voltage vectors are the non-zero voltage vectors of the first space angle region;
if the target space angle region is the second space angle region, determining N2-1 non-zero voltage vectors with the second space angle region as the center from the non-zero voltage vectors of the plurality of space angle regions, and determining one remaining non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle region.
7. The method according to claim 6, wherein the preset angle is 180 degrees, and the three-phase modulated wave comprises three-phase sine waves having phases different by 120 degrees.
8. An inverter circuit control device, comprising:
the device comprises a determining module, a calculating module and a judging module, wherein the determining module is used for determining a non-zero voltage vector of a target space angle region from the non-zero voltage vectors of a plurality of space angle regions; the target space angle region is a first space angle region or a second space angle region in the plurality of space angle regions, wherein a first number N1 of non-zero voltage vectors of the first space angle region is greater than a second number N2 of non-zero voltage vectors of the second space angle region, and a preset number of second space angle regions are spaced between every two first space angle regions; determining the action time of the non-zero voltage vector of the target space angle region; determining waveform control parameters according to the non-zero voltage vector of the target space angle region and the action time of the non-zero voltage vector;
the generating module is used for generating a control signal according to the waveform control parameter so as to control the state of the inverter circuit;
the determining module is specifically configured to determine, if the target spatial angle region is the first spatial angle region, N1 nonzero voltage vectors centered around the first spatial angle region from the nonzero voltage vectors of the multiple spatial angle regions, and the N1 nonzero voltage vectors are the nonzero voltage vectors of the first spatial angle region; if the target space angle area is the second space angle area, determining N2-1 non-zero voltage vectors taking the second space angle area as the center from the non-zero voltage vectors of the plurality of space angle areas, and determining one rest non-zero voltage vector obtained by deflecting any non-zero voltage vector in the plurality of non-zero voltage vectors by 180 degrees as the non-zero voltage vector of the second space angle area.
9. An inverter module, comprising: the inverter circuit is connected with the controller;
the controller includes: a memory storing a computer program executable by the processor, and a processor implementing the inverter circuit control method according to any one of claims 1 to 7 when the computer program is executed by the processor, and outputting the control signal to the inverter circuit to control a switching state in the inverter circuit.
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