CN110784198A - Inverter space vector pulse width modulation method, device and storage medium - Google Patents
Inverter space vector pulse width modulation method, device and storage medium Download PDFInfo
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Abstract
The invention relates to a method, a device and a storage medium for modulating space vector pulse width of an inverter, wherein the method comprises the following steps: the method comprises the steps of obtaining a reference coordinate corresponding to a reference voltage vector of an inverter in a reference coordinate system, decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector through a region judgment synthesis mode according to the reference coordinate, inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time, distributing the first action time to the first component vector, distributing the second action time to the second component vector and distributing the third action time to the third component vector according to a preset distribution rule to achieve modulation of a space vector pulse width of the inverter, improve operation speed and rapidly and efficiently complete modulation of the space vector pulse width of the inverter.
Description
Technical Field
The invention relates to the technical field of pulse width modulation, in particular to a method and a device for modulating space vector pulse width of an inverter and a storage medium.
Background
The Pulse Width Modulation (PWM) control technology is a common and core technology of high-performance power electronic system, and is a technology which utilizes the on-off of semiconductor device to program DC voltage into voltage Pulse sequence with a certain shape so as to implement frequency conversion and voltage transformation and effectively control and eliminate harmonic wave. The Space Vector Pulse Width Modulation (SVPWM) method is a Pulse Width Modulation method established on the Space voltage Vector synthesis concept, and by adopting the method, the digitization is easy to realize, the output waveform quality is good, the output waveform is close to sine, the Space Vector is reasonably arranged, the switching frequency can be reduced, and the switching loss is reduced.
The existing inverter space vector pulse width modulation method determines three basic vectors of a synthesized reference voltage vector according to a reference voltage vector synthesis principle and an obtained vector angle, determines action time corresponding to each basic vector of a reference voltage according to the three basic vectors, and finally allocates action time states, so that inverter space vector pulse width modulation is realized.
However, in the existing inverter space vector pulse width modulation method, three basic vectors are calculated by obtaining the vector angle of the reference voltage vector, and since the vector angle may be any angle between 0 ° and 360 °, each vector angle needs to be subjected to trigonometric function calculation, so as to obtain three component vectors, the calculation speed is slow, and the method is not beneficial to quickly and efficiently completing the modulation of the inverter space vector pulse width.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus and a storage medium for modulating space vector pulse width of an inverter, so as to achieve fast and efficient modulation of space vector pulse width of the inverter.
In order to achieve the purpose, the invention adopts the following technical scheme:
an inverter space vector pulse width modulation method, comprising:
acquiring a reference coordinate corresponding to the reference voltage vector of the inverter in a reference coordinate system;
according to the reference coordinate, decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment and synthesis mode;
inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time;
according to a preset distribution rule, the first action time is distributed to the first component vector, the second action time is distributed to the second component vector, and the third action time is distributed to the third component vector, so that the modulation of the space vector pulse width of the inverter is realized.
Optionally, the decomposing the reference voltage vector into a first component vector, a second component vector, and a third component vector by a region judgment synthesis method according to the reference coordinate includes:
calculating a vector angle of the reference voltage vector through the reference coordinate;
determining an algorithm unit corresponding to the vector angle based on a preset algorithm rule;
acquiring a first reference vector, a second reference vector and a third reference vector corresponding to the arithmetic unit;
decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector based on the first reference vector, the second reference vector, the third reference vector and a nylon triangular vector method.
Optionally, the determining, based on the preset algorithm rule, the algorithm unit corresponding to the vector angle includes:
determining an algorithm area and a comparison model corresponding to the reference voltage vector according to the vector angle;
inputting the reference coordinates into the comparison model, and outputting an algorithm unit identifier;
and screening the algorithm units corresponding to the reference voltage vectors in the algorithm area according to the algorithm unit identification.
Optionally, the determining the comparison model corresponding to the reference voltage vector includes:
when the vector angle is smaller than or equal to a preset angle value, determining a first sub-comparison model as the comparison model;
and when the vector angle is larger than the preset angle value, determining a second sub-comparison model as the comparison model.
Optionally, the inputting the first component vector, the second component vector, the third component vector, and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time, and a third action time includes:
determining sub-coordinate values of the first component vector, the second component vector and the third component vector respectively;
and inputting the sub-coordinate values into an action time calculation formula, and outputting a first action time corresponding to the first component vector, a second action time corresponding to the second component vector and a third action time corresponding to the third component vector.
Optionally, before the determining the sub-coordinate values of the first partial vector, the second partial vector, and the third partial vector, respectively, the method further includes:
determining the action time of each algorithm unit corresponding to the reference voltage vector through a volt-second balance calculation model;
and integrating the action time of each algorithm unit to obtain the action time calculation formula.
Optionally, the pre-constructed algorithm model is a volt-second balance calculation model;
the calculation formula of the volt-second balance calculation model is as follows:
V
1*T
1+V
2*T
2+V
3*T
3＝V
ref*T
s，
T
1+T
2+T
3＝T
s，
wherein, T
1For a first action time, T
2For a second action time, T
3For a third action time, V
1Is a first component vector, V
2Is a second component vector, V
3Is a third partial vector, T
sIs a sampling period, V
refIs a vector of reference voltages.
Optionally, the preset allocation rule is a seven-segment space voltage vector modulation waveform.
An inverter space vector pulse width modulation device comprising:
the acquisition module is used for acquiring a corresponding reference coordinate of a reference voltage vector of the inverter in a reference coordinate system;
the decomposition module is used for decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment synthesis mode according to the reference coordinate;
the time determining module is used for inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time;
and the time distribution module is used for distributing the first action time to the first component vector, distributing the second action time to the second component vector and distributing the third action time to the third component vector according to a preset distribution rule so as to realize the modulation of the space vector pulse width of the inverter.
A storage medium storing a computer program which, when executed by a processor, implements the inverter space vector pulse width modulation method of any one of the above, as optional.
According to the space vector pulse width modulation method, device and storage medium of the inverter, a reference coordinate corresponding to a reference voltage vector of the inverter in a reference coordinate system is obtained, the reference voltage vector is decomposed into a first component vector, a second component vector and a third component vector in a region judgment and synthesis mode according to the reference coordinate, then the first component vector, the second component vector, the third component vector and the reference voltage vector are input into a pre-constructed algorithm model, a first action time, a second action time and a third action time are obtained, finally, the first action time is distributed to the first component vector, the second action time is distributed to the second component vector and the third action time is distributed to the third component vector according to a preset distribution rule, and therefore modulation of the space vector pulse width of the inverter is achieved. By adopting the technical scheme of the invention, the vector angle of the reference voltage can be divided into a plurality of angle areas by a region judgment mode, and the reference voltage vector is decomposed into three component vectors by utilizing a calculation method of each angle area, so that the complex operation of performing trigonometric function operation on each vector angle between 0-360 degrees is avoided, the operation speed is improved, and the modulation of the space vector pulse width of the inverter is conveniently and quickly completed with high efficiency.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an inverter space vector pulse width modulation method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of algorithm area division according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of corresponding algorithm units of the algorithm area in fig. 2.
Fig. 4 is a schematic diagram of the preset allocation rule in step S14 in fig. 1.
Fig. 5 is a schematic structural diagram of an inverter space vector pulse width modulation device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a flowchart of an inverter space vector pulse width modulation method according to an embodiment of the present invention, fig. 2 is a schematic diagram of algorithm region division according to an embodiment of the present invention, fig. 3 is a schematic diagram of corresponding algorithm units of the algorithm region in fig. 2, and fig. 4 is a schematic diagram of preset allocation rules in step S14 in fig. 1.
As shown in fig. 1, the inverter space vector pulse width modulation method of the present embodiment includes the following steps:
and S11, acquiring corresponding reference coordinates of the reference voltage vector of the inverter in a reference coordinate system.
The inverter in the embodiment can adopt a three-level inverter, and a three-level topological structure of the three-level inverter has the advantages of large output capacity, high output voltage, small current harmonic content and the like, so that the three-level structure is widely applied to the field of variable frequency speed regulation of high-voltage high-power alternating current motors.
In practical applications, the inverter space vector pulse width modulation method may be applied to an inverter space vector pulse width modulation device, and a main body of the inverter space vector pulse width modulation device may be implemented by a computer program, such as a software application, or may also be implemented by a physical device integrated with a related computer program, for example, the device may be a processor, or may also be implemented by a storage medium storing the related computer program, and all main bodies implementing the method of the present invention take the processor as an example.
In practical applications, the processor may represent the reference voltage vector of the inverter on the rectangular coordinate plane α - β by using the reference coordinates of the α axis and the β axis, and then the first component vector, the second component vector, the third component vector of the reference voltage vector and the vector angle of the reference voltage vector may be represented by the reference coordinates of the α axis and the β axis.
And S12, decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector by a region judgment synthesis mode according to the reference coordinate.
After obtaining the reference coordinates of the reference voltage vector, calculating the vector angle of the reference voltage vector by the reference coordinates, calculating the sine value and the cosine value of the vector angle of the reference voltage vector by the reference coordinate value a corresponding to the α axis and the reference coordinate value B corresponding to the β axis in the reference coordinates, further calculating the vector angle of the reference voltage vector, determining the algorithm area corresponding to the reference voltage vector according to the vector angle, referring to fig. 2, an algorithm area division diagram divides the whole vector space into six algorithm areas i-vi, taking the area i as an example, each algorithm area may include 1-6 six algorithm units, fig. 2 shows the correspondence between different switching states and space vectors, where pon represents the switching states of the three-phase outputs a, B, C, positive, zero, negative, and the others are similar, no longer.
After the algorithm area is determined, the algorithm unit corresponding to the reference voltage vector is determined from the corresponding algorithm area, as shown in fig. 3, the determination of the algorithm unit is described by taking the first algorithm area as an example, and the algorithm unit corresponding to the reference voltage vector can be determined by the relationship between the position of the reference voltage vector and the reference line a, the reference line b, the reference line c and the reference line d in fig. 3. Specifically, an algorithm unit 1 is arranged on the left side of the reference line a and on the lower side of the reference line d; on the left side of the reference line a and on the upper side of the reference line d is an arithmetic unit 2; simultaneously, an arithmetic unit 3 is arranged at the right side of the reference line a, at the lower side of the reference line d and at the left side of the reference line c; simultaneously, an arithmetic unit 4 is arranged on the right side of the reference line a, on the upper side of the reference line d and on the lower side of the reference line b; an arithmetic unit 6 is arranged on the upper side of the reference line b; to the right of the reference line c is an arithmetic unit 5. Reference line a, reference line b, reference line c, and reference line d may each be represented by coordinates.
The detailed process of determining the algorithm unit includes determining a comparison model corresponding to the reference voltage vector according to the vector angle of the reference voltage vector, and in practical application, referring to fig. 3, determining that the comparison model corresponding to the reference voltage vector is a first sub-comparison model when the vector angle is compared with the α axis and the exceeding angle is less than or equal to 30 °, determining that the comparison model corresponding to the reference voltage vector is a second sub-comparison model when the vector angle is compared with the α axis and the exceeding angle is greater than or equal to 30 °, wherein 30 ° is one of preset angle values and does not form any limiting function, inputting the corresponding reference coordinate into the sub-comparison model after the sub-comparison model corresponding to the reference voltage vector is determined, outputting the identifier of the algorithm unit, and screening the algorithm unit corresponding to the reference voltage vector in the algorithm area according to the identifier of the algorithm unit
refThe coordinate value at α axis is A, the flag value at β axis is B, and U is the bus voltage
And
making a comparison if B is less than or equal to
The first sub-comparison model outputs the identifier 1 of the algorithm unit; if B is less than or equal to
The first sub-comparison model outputs the identity 5 of the algorithm unit; if B is greater than
And is greater than
The first comparison model outputs the identification 3 of the arithmetic unit. A second sub-comparison model, comparing B with B
And
making a comparison if B is less than or equal to
The second sub-comparison model outputs the identifier 2 of the algorithm unit; if B is greater than or equal to
The second comparison model outputs the identification 6 of the algorithm unit; if B is greater than
And is less than
The second comparison model outputs the identity 4 of the arithmetic unit. And finally, each algorithm identification corresponds to an algorithm unit, and the algorithm unit corresponding to the reference voltage vector is determined from the determined algorithm area according to the identification of the algorithm unit output by the sub-comparison model.
After the algorithm unit is determined, a first reference vector, a second reference vector and a third reference vector corresponding to the algorithm unit are obtained, and then the reference voltage vector is decomposed into a first component vector, a second component vector and a third component vector according to the nerveqi triangular vector law (NTV).
And S13, inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first acting time, a second acting time and a third acting time.
Specifically, a first component vector, a second component vector, a third component vector and a reference voltage vector of a reference voltage vector are input into a volt-second balance calculation model, and three action times of the reference voltage vector are output through the volt-second balance calculation model.
The calculation formula of the volt-second balance calculation model is as follows:
V
1*T
1+V
2*T
2+V
3*T
3＝V
ref*T
s，
T
1+T
2+T
3＝T
s，
wherein, T
1For a first action time, T
2For a second action time, T
3For a third action time, V
1Is a first component vector, V
2Is a second component vector, V
3Is a third partial vector, T
sIs a sampling period, V
refIs a vector of reference voltages.
Three component vectors V to be determined
1、V
2、V
3And a reference voltage vector V
refThe voltage-second balance calculation model is brought into the voltage-second balance calculation model together, and the first action time T of the reference voltage vector is solved by the voltage-second balance calculation model by combining a basic formula of a waveform algorithm
1Second action time T
2And a third application time T
3。
Calculating a first action time T
1Second action time T
2And a third application time T
3The method also comprises the steps of calculating the action time corresponding to the reference voltage vector corresponding to each algorithm unit in advance through a volt-second balance calculation model, integrating the action time of each algorithm unit to obtain an action time calculation formula, then determining sub-coordinate values of the first sub-vector, the second sub-vector and the third sub-vector, substituting the reference coordinate value A corresponding to the sub-coordinate value in the α axis and the reference coordinate value B corresponding to the sub-coordinate value in the β axis into the corresponding action time calculation formula, and solving the first action time T
1Second action time T
2And a third application time T
3. Specifically, Table 1 shows the reference voltage vector actingThe method comprises the following steps of calculating a formula, wherein T is a sampling period, U is bus voltage, I, II, III, IV, V and VI are corresponding algorithm areas, 1-6 are corresponding algorithm units, each algorithm area corresponds to 6 algorithm units, I-1 represents the 1 st algorithm unit of the I algorithm area, and the rest of the same principles are not described.
Table 1: formula table for calculating action time
And S14, according to a preset distribution rule, distributing the first action time to the first component vector, distributing the second action time to the second component vector, and distributing the third action time to the third component vector to realize the modulation of the space vector pulse width of the inverter.
In practical applications, the allocation rule may be preset according to a specific control requirement, and the first action time, the second action time, and the third action time are allocated. One of the allocation rules, as shown in fig. 4, may use a centrosymmetric seven-segment SVPWM waveform to allocate the action time of the sub-vector to the corresponding vector state. In practical application, the first action time is distributed to the first partial vector, the second action time is distributed to the second partial vector, and the third action time is distributed to the third partial vector, that is, the pulse width of the inverter is modulated by time, and then the on and off times are respectively distributed to the switching devices of the inverter, so that the control of the main circuit switching devices in the inverter is completed. The method for sampling the pulse width modulation has the advantages of high voltage utilization rate, easy digital realization, good output waveform quality, approximate sine, reasonable arrangement of space vectors, capability of reducing the switching frequency of switching devices in the inverter and reduction of switching loss.
The method for modulating the space vector pulse width of the inverter comprises the steps of obtaining a reference coordinate corresponding to a reference voltage vector of the inverter in a reference coordinate system, decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment and synthesis mode according to the reference coordinate, inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time, finally, distributing the first action time to the first component vector, distributing the second action time to the second component vector and distributing the third action time to the third component vector according to a preset distribution rule, and thus realizing modulation of the space vector pulse width of the inverter. By adopting the technical scheme of the invention, the vector angle of the reference voltage can be divided into a plurality of angle areas by a region judgment mode, and the reference voltage vector is decomposed into three component vectors by utilizing a calculation method of each angle area, so that the complex operation of performing trigonometric function operation on each vector angle between 0-360 degrees is avoided, the operation speed is improved, and the modulation of the space vector pulse width of the inverter is conveniently and quickly completed with high efficiency.
Fig. 5 is a schematic structural diagram of an inverter space vector pulse width modulation device according to an embodiment of the present invention.
As shown in fig. 5, an inverter space vector pulse width modulation apparatus of the present embodiment includes:
the acquiring module 10 is configured to acquire a reference coordinate corresponding to a reference voltage vector of the inverter in a reference coordinate system;
the decomposition module 20 is configured to decompose the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment synthesis manner according to the reference coordinate;
the time determination module 30 is configured to input the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time;
and the time distribution module 40 is configured to distribute the first action time to the first component vector, distribute the second action time to the second component vector, and distribute the third action time to the third component vector according to a preset distribution rule, so as to implement modulation on the pulse width of the inverter space vector.
The inverter space vector pulse width modulation device of the embodiment is characterized in that a reference coordinate corresponding to a reference voltage vector of an inverter in a reference coordinate system is obtained, the reference voltage vector is decomposed into a first component vector, a second component vector and a third component vector in a region judgment and synthesis mode according to the reference coordinate, then the first component vector, the second component vector, the third component vector and the reference voltage vector are input into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time, finally, the first action time is distributed to the first component vector, the second action time is distributed to the second component vector and the third action time is distributed to the third component vector according to a preset distribution rule, so that the modulation of the inverter space vector pulse width is realized. By adopting the technical scheme of the invention, the vector angle of the reference voltage can be divided into a plurality of angle areas by a region judgment mode, and the reference voltage vector is decomposed into three component vectors by utilizing a calculation method of each angle area, so that the complex operation of performing trigonometric function operation on each vector angle between 0-360 degrees is avoided, the operation speed is improved, and the modulation of the space vector pulse width of the inverter is conveniently and quickly completed with high efficiency.
Further, the decomposition module 20 is specifically configured to:
calculating a vector angle of a reference voltage vector through the reference coordinate;
determining an algorithm unit corresponding to the vector angle based on a preset algorithm rule;
acquiring a first reference vector, a second reference vector and a third reference vector corresponding to an algorithm unit;
the reference voltage vector is decomposed into a first component vector, a second component vector and a third component vector based on the first reference vector, the second reference vector, the third reference vector and a nylon triangular vector method.
Further, the decomposition module 20 is further configured to:
according to the vector angle, when the vector angle is smaller than or equal to a preset angle value, determining the first sub-comparison model as a comparison model;
and when the vector angle is larger than the preset angle value, determining the second sub-comparison model as the comparison model.
Inputting the reference coordinates into a comparison model, and outputting an algorithm unit identifier;
and screening the algorithm units corresponding to the reference voltage vectors in the algorithm area according to the algorithm unit identification.
Further, the time determination module 30 is configured to:
respectively determining sub-coordinate values of the first component vector, the second component vector and the third component vector;
and inputting the sub-coordinate values into an action time calculation formula, and outputting a first action time corresponding to the first component vector, a second action time corresponding to the second component vector and a third action time corresponding to the third component vector.
Further, the time determination module 30 is further configured to:
determining the action time of each algorithm unit corresponding to the reference voltage vector through a volt-second balance calculation model;
and integrating the action time of each algorithm unit to obtain an action time calculation formula.
Further, the pre-constructed algorithm model is a volt-second balance calculation model;
the calculation formula of the volt-second balance calculation model is as follows:
V
1*T
1+V
2*T
2+V
3*T
3＝V
ref*T
s，
T
1+T
2+T
3＝T
s，
wherein, T
1For a first action time, T
2For a second action time, T
3For a third action time, V
1Is a first component vector, V
2Is a second component vector, V
3Is a third partial vector, T
sIs a sampling period, V
refIs a vector of reference voltages.
Further, the preset distribution rule in the time distribution module is a seven-segment space voltage vector modulation waveform.
With regard to the embodiments of the apparatus part described above, detailed explanations have been made in the corresponding method embodiments, so that no specific explanations have been made in the apparatus part, which can be understood with reference to the corresponding embodiments of the method part.
This embodiment also protects an electronic device, including: a memory and a processor;
a memory for storing executable instructions of the processor;
the processor is used for executing the inverter space vector pulse width modulation method of any one of the above embodiments.
The present embodiment also protects a storage medium, which stores a computer program, and when the computer program is executed by a processor, the inverter space vector pulse width modulation method according to any of the above embodiments is implemented.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An inverter space vector pulse width modulation method, comprising:
acquiring a reference coordinate corresponding to the reference voltage vector of the inverter in a reference coordinate system;
according to the reference coordinate, decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment and synthesis mode;
inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time;
according to a preset distribution rule, the first action time is distributed to the first component vector, the second action time is distributed to the second component vector, and the third action time is distributed to the third component vector, so that the modulation of the space vector pulse width of the inverter is realized.
2. The method of claim 1, wherein decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector by a region-based synthesis according to the reference coordinate comprises:
calculating a vector angle of the reference voltage vector through the reference coordinate;
determining an algorithm unit corresponding to the vector angle based on a preset algorithm rule;
acquiring a first reference vector, a second reference vector and a third reference vector corresponding to the arithmetic unit;
decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector based on the first reference vector, the second reference vector, the third reference vector and a nylon triangular vector method.
3. The method according to claim 2, wherein said determining the algorithm unit corresponding to the vector angle based on the preset algorithm rule comprises:
determining an algorithm area and a comparison model corresponding to the reference voltage vector according to the vector angle;
inputting the reference coordinates into the comparison model, and outputting an algorithm unit identifier;
and screening the algorithm units corresponding to the reference voltage vectors in the algorithm area according to the algorithm unit identification.
4. The method of claim 3, wherein determining the comparative model to which the reference voltage vector corresponds comprises:
when the vector angle is smaller than or equal to a preset angle value, determining a first sub-comparison model as the comparison model;
and when the vector angle is larger than the preset angle value, determining a second sub-comparison model as the comparison model.
5. The method of claim 2, wherein inputting the first component vector, the second component vector, the third component vector, and the reference voltage vector into a pre-constructed algorithmic model to obtain a first action time, a second action time, and a third action time comprises:
determining sub-coordinate values of the first component vector, the second component vector and the third component vector respectively;
and inputting the sub-coordinate values into an action time calculation formula, and outputting a first action time corresponding to the first component vector, a second action time corresponding to the second component vector and a third action time corresponding to the third component vector.
6. The method of claim 5, wherein prior to determining sub-coordinate values of the first, second, and third partial vectors, respectively, further comprising:
determining the action time of each algorithm unit corresponding to the reference voltage vector through a volt-second balance calculation model;
and integrating the action time of each algorithm unit to obtain the action time calculation formula.
7. The method of claim 1, wherein the pre-constructed algorithmic model is a volt-second equilibrium computational model;
the calculation formula of the volt-second balance calculation model is as follows:
V
1*T
1+V
2*T
2+V
3*T
3＝V
ref*T
s，
T
1+T
2+T
3＝T
s，
wherein, T
1For a first action time, T
2For a second action time, T
3For a third action time, V
1Is a first component vector, V
2Is a second component vector, V
3Is a third partial vector, T
sIs a sampling period, V
refIs a vector of reference voltages.
8. The method of claim 1, wherein the predetermined allocation rule is a seven-segment space voltage vector modulation waveform.
9. An inverter space vector pulse width modulation device, comprising:
the acquisition module is used for acquiring a corresponding reference coordinate of a reference voltage vector of the inverter in a reference coordinate system;
the decomposition module is used for decomposing the reference voltage vector into a first component vector, a second component vector and a third component vector in a region judgment synthesis mode according to the reference coordinate;
the time determining module is used for inputting the first component vector, the second component vector, the third component vector and the reference voltage vector into a pre-constructed algorithm model to obtain a first action time, a second action time and a third action time;
and the time distribution module is used for distributing the first action time to the first component vector, distributing the second action time to the second component vector and distributing the third action time to the third component vector according to a preset distribution rule so as to realize the modulation of the space vector pulse width of the inverter.
10. A storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the inverter space vector pulse width modulation method according to any one of claims 1 to 8.
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