CN111510004A - Space vector pulse width modulation method, device and system - Google Patents

Space vector pulse width modulation method, device and system Download PDF

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Publication number
CN111510004A
CN111510004A CN202010257263.6A CN202010257263A CN111510004A CN 111510004 A CN111510004 A CN 111510004A CN 202010257263 A CN202010257263 A CN 202010257263A CN 111510004 A CN111510004 A CN 111510004A
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flux linkage
determining
vectors
action
pulse width
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李明峰
李沁遥
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Shanghai Kunzhen Integrated Circuit Co ltd
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Shanghai Kunzhen Integrated Circuit Co ltd
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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention is suitable for the technical field of alternating current and Alternating Current (AC) frequency control, and provides a space vector pulse width modulation method, a device and a system, wherein the method comprises the following steps: determining a plurality of division areas of a flux linkage circle; determining two synthetic flux linkage vectors corresponding to each divided region; determining a zero vector corresponding to the divided regions, wherein the switching state of at least one bridge arm of the zero vector is always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors; determining an action period of two resultant flux linkage vectors and a zero vector corresponding to the divided regions. According to the space vector pulse width modulation method provided by the embodiment of the invention, the switching state of at least one bridge arm and the switching state of the corresponding bridge arm of the two synthetic flux linkage vectors are always the same zero vector, so that the switching state of one bridge arm can be always kept unchanged in each partition interval, and compared with the existing space vector pulse width modulation method, the loss of a switch can be reduced by 1/3 theoretically.

Description

Space vector pulse width modulation method, device and system
Technical Field
The invention belongs to the technical field of Alternating Current (AC) and Alternating Current (AC) frequency control, and particularly relates to a space vector pulse width modulation method, device and system.
Background
The two-level three-phase inverter can convert direct current into alternating current with variable frequency and amplitude, and is widely applied. For example, in a driving system of an electric vehicle, an inverter converts direct current output from a battery into three-phase alternating current, thereby driving a three-phase permanent magnet synchronous motor. And space vector pulse width modulation technology is commonly adopted in two-level three-phase inverters.
The existing space vector pulse width modulation technology generally adopts a 7-segment code symmetric space vector allocation algorithm. In the algorithm, two zero vectors are needed because each switching period is symmetrical, so the symmetry is good, and the algorithm is easy to realize by software control. However, this algorithm switches frequently, which is detrimental to switching losses.
Therefore, the existing space vector pulse width modulation method also has the technical problem of serious switching loss caused by frequent switching actions.
Disclosure of Invention
The embodiment of the invention aims to provide a space vector pulse width modulation method, and aims to solve the technical problem that the switching loss is serious due to frequent switching action in the conventional space vector pulse width modulation method.
The embodiment of the invention is realized in such a way that a space vector pulse width modulation method is applied to a control system for driving a three-phase motor by an inverter, and comprises the following steps:
determining a plurality of division areas of a flux linkage circle corresponding to the control system;
determining two synthetic flux linkage vectors corresponding to the partitioned regions; the synthetic flux linkage vector corresponds to the switching states of the three bridge arms;
determining a zero vector corresponding to the divided regions according to the two synthetic flux linkage vectors; the switching state of at least one bridge arm of the zero vector is always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors;
determining an action period of two resultant flux linkage vectors and a zero vector corresponding to the divided regions.
Another object of an embodiment of the present invention is to provide a space vector pulse width modulation apparatus, including:
a division area determining unit configured to determine a plurality of division areas of a flux linkage circle corresponding to the control system;
a synthetic flux vector determination unit for determining two synthetic flux vectors corresponding to the divided sections; the synthetic flux linkage vector corresponds to the switching states of the three bridge arms;
a zero vector determining unit for determining a zero vector corresponding to the divided regions from the two synthetic flux linkage vectors; the switching state of at least one bridge arm of the zero vector is always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors;
an action period determining unit for determining action periods of two synthetic flux linkage vectors and a zero vector corresponding to the divided sections.
It is another object of an embodiment of the present invention to provide a space vector pulse width modulation system, which includes a control system for driving a three-phase motor by an inverter, and a complex programmable logic device, wherein the complex programmable logic device controls the inverter to drive the three-phase motor by using the space vector pulse width modulation method as described above.
After determining two synthesized flux linkage vectors used in each division area of a flux linkage circle corresponding to the control system, selecting a zero vector in which the switching state of at least one bridge arm is always the same as the switching state of the bridge arm corresponding to the two synthesized flux linkage vectors, so that the switching state of one bridge arm can always be kept unchanged in each division area, that is, the time of 1/3 for each switch in a complete period is kept unchanged.
Drawings
Fig. 1 is a control circuit diagram of a three-phase motor driven by an inverter according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a space vector pulse width modulation method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps for determining a vector contribution period according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating steps for determining a vector action duration according to an embodiment of the present invention;
FIG. 5(a) is a schematic diagram of vector allocation of each interval in a 7-segment code symmetric space vector pulse width modulation method;
fig. 5(b) is a schematic diagram of vector allocation of each interval in the space vector pulse width modulation method according to the embodiment of the present invention;
FIG. 6(a) is a waveform diagram of a bridge arm switch state experiment of a 7-segment code symmetric space vector pulse width modulation method;
fig. 6(b) is a waveform diagram of a bridge arm switch state experiment of the space vector pulse width modulation method according to the embodiment of the present invention
Fig. 7 is a schematic structural diagram of a space vector pulse width modulation apparatus 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 present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
First, briefly explaining the space vector pulse width modulation method mentioned in the background art, the space vector pulse width modulation method is mainly applied to a control system for driving a three-phase motor with an inverter, and as shown in fig. 1, a control circuit diagram for driving a three-phase motor with an inverter is provided.
As shown in FIG. 1, the circuit includes 6 switching devices V1～V6In total, 8 switching patterns can be formed, wherein 6 switching patterns generate output voltages, corresponding 6 composite flux linkage vectors can be formed in a three-phase motor, and 2 switching patterns do not output voltagesThe vector, which does not increment the flux linkage vector, is called a zero vector. Specifically, when the upper arm switching device of a certain phase of the motor is turned on, it is recorded as 1, and when the lower arm switching device is turned on, it is recorded as 0. For example when V2、V3、V4When the current is conducted, the lower arm switching devices of the U phase and the W phase are conducted, the upper arm switching devices of the V phase are conducted and recorded as a synthetic flux linkage vector delta psi (010), the number in the synthetic flux linkage vector bracket indicates the U phase at the 1 st bit, the V phase at the 2 nd bit and the W phase at the 3 rd bit. When V is3、V4、V5When conducting, the vector delta psi (011) is formed, and so on. When V is1、V3、V5Conducting or V2、V4、V6When the motor is conducted, three terminals of the motor are simultaneously connected to the positive end of the direct current power supply or simultaneously connected to the negative end of the direct current power supply, and no flux linkage vector is formed, so that the motor is called V1、V3、V5Forming a zero vector Δ Ψ (111), V when turned on2、V4、V6A zero vector Δ Ψ (000) is formed when turned on. Because the three-phase symmetrical sine wave voltage drives the three-phase symmetrical motor to be converted into a circular track under the coordinate axis of d-p, namely, in a control system for driving the three-phase motor by the inverter, the switching mode is switched, namely, the integral synthesis is carried out on the corresponding flux linkage vector, and if the synthesized flux linkage vector can well track the circular track, the three-phase voltage output in the control system for driving the three-phase motor by the inverter is also the three-phase symmetrical sine wave. This part of the content belongs to the common knowledge of space vector pulse width modulation, and the detailed description is not repeated herein, and those skilled in the art will understand the specific content of the idea of the present invention of the control system for driving a three-phase motor with an inverter and the space vector pulse width modulation method.
As shown in fig. 2, a flowchart of steps of a space vector pulse width modulation method provided in an embodiment of the present invention specifically includes the following steps:
step S202, a plurality of divided areas of the magnetic linkage circle corresponding to the control system are determined.
In the embodiment of the invention, the flux linkage circle is divided into a plurality of divided areas, and vector composition capable of approaching the chord of each divided area is found for each divided area, so that the flux linkage circle is integrally approached to the flux linkage circle, and the space vector pulse width modulation is realized.
As a preferred embodiment of the present invention, the number of the division areas is a multiple of 6, which can form a complete circle cycle.
Step S204, two synthetic flux linkage vectors corresponding to the divided regions are determined.
In the embodiment of the invention, each divided interval can be synthesized by two flux linkage vectors of which the average proceeding direction is consistent with the chord of the interval, if the acting time of the two flux linkage vectors is not equal to the period of the divided interval, the frequency of the output three-phase wave is not equal to the frequency of the three-phase wave required to be output, and in order to further enable the acting time of the two flux linkage vectors to be just equal to the period of the divided interval, the acting time needs to be further controlled by filling with zero vectors.
And step S206, determining a zero vector corresponding to the divided regions according to the two synthetic flux linkage vectors.
In the embodiment of the invention, only one zero vector is selected to fill in each division interval to control the action time, and the switching state of at least one bridge arm of the zero vector is required to be always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors. For example, for a division region between 0 to 60 °, when Δ Ψ (100) and Δ Ψ (101) are selected as a composite flux linkage vector, at this time Δ Ψ (111) can be selected as a zero vector, and at this time, since the first digits of Δ Ψ (100), Δ Ψ (101), and Δ Ψ (111) are all 1, that is, the U phase is in the upper bridge arm conducting state, that is, no matter what action duration and sequence Δ Ψ (100), Δ Ψ (101), and Δ Ψ (111) are combined, the U phase is always in the upper bridge arm conducting state, that is, in the division region between 0 to 60 °, the U phase corresponding to is always stationary, so as to reduce the switching loss of the U phase bridge arm, compared to the existing 7-segment code symmetric space vector pulse width modulation method, for facilitating software implementation, two zero vectors a Ψ (111) and Δ Ψ (000) are symmetrically utilized in each division region, that is, when Δ Ψ (000) is converted into Δ Ψ (100), the U-phase bridge arm needs to be switched from the lower bridge arm conducting state to the upper bridge arm conducting state, and therefore the space vector pulse width modulation method provided by the invention can theoretically reduce the switching loss 1/3 of each phase bridge arm.
In step S208, the action periods of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions are determined.
In the embodiment of the present invention, in order to output a three-phase sine wave meeting the requirement, the vector composition of each interval needs to be exactly corresponding to the chord phase of the flux linkage circle corresponding to the three-phase sine wave on each interval, that is, the action time periods of two synthesized flux linkage vectors and a zero vector corresponding to each divided interval need to be further designed according to the output requirement, so as to ensure that the output voltage and the frequency of the output three-phase sine wave meet the requirement.
In the embodiment of the present invention, please refer to fig. 3 and the explanation thereof for specific steps of determining the acting time periods of the two resultant flux linkage vectors and the zero vector.
After determining two synthesized flux linkage vectors used in each division area of a flux linkage circle corresponding to the control system, selecting a zero vector in which the switching state of at least one bridge arm is always the same as the switching state of the bridge arm corresponding to the two synthesized flux linkage vectors, so that the switching state of one bridge arm can always be kept unchanged in each division area, that is, the time of 1/3 for each switch in a complete period is kept unchanged.
As shown in fig. 3, a flowchart of the steps for determining the vector action period provided in the embodiment of the present invention specifically includes the following steps:
step S302, determining the acting time lengths of two synthetic flux linkage vectors and a zero vector corresponding to the divided regions.
In the embodiment of the present invention, when the acting time of the synthetic flux linkage vector is longer and the acting time of the zero vector is shorter, the effective value of the finally output three-phase voltage is larger, and therefore, the acting time of the synthetic flux linkage vector needs to be determined according to the effective value of the three-phase voltage required to be output, and the ratio of the acting time of the two synthetic flux linkage vectors determines the angle of the synthetic voltage space vector, and the ratio of the acting time of the two synthetic flux linkage vectors needs to be determined according to the chord phase angle degree between the currently divided regions, and the step of specifically determining the acting time of the vector refers to fig. 4 and the explanation thereof.
Step S304, determining the action sequence of two synthetic flux linkage vectors and a zero vector corresponding to the divided regions.
In the embodiment of the invention, while a certain bridge arm switch is ensured to be motionless, the action sequence of two composite flux linkage vectors and a zero vector is determined by changing the sequence of the switch state of only one bridge arm at each switching vector, for example, when Δ Ψ (100), Δ Ψ (101) as a composite flux linkage vector and Δ Ψ (111) as a zero vector are used, the action sequence of the vectors is in turn Δ Ψ (100), Δ Ψ (101), Δ Ψ (111), Δ Ψ (101) and Δ Ψ (100) in a cycle, it can be seen that only the switch state of one bridge arm changes at each switching vector, and the first bridge arm, i.e., the bridge arm corresponding to U, does not change all the time.
Step S306, determining action time periods of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions according to action duration and action sequence of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions.
In the embodiment of the invention, after the action duration and the action sequence of each flux linkage vector are determined, the action time periods of each synthetic flux linkage vector and each zero vector can be correspondingly determined, namely the time periods for keeping the switch states of various bridge arms are correspondingly determined, and the required three-phase power output can be realized by controlling the time periods for keeping the switch states of various bridge arms through a set program.
Fig. 4 is a flowchart illustrating steps for determining a vector action duration according to an embodiment of the present invention, which is described in detail below.
And step S402, respectively determining the action time of two synthetic flux linkage vectors corresponding to the divided regions according to the amplitude modulation ratio and the required output voltage.
Step S404, determining the acting time of the zero vector corresponding to the division interval according to the carrier frequency and the acting time of the two synthetic magnetic linkage vectors.
In the embodiment of the present invention, T is a carrier frequency, M is an amplitude modulation ratio (the maximum value of M is 0.866), and U is a required output voltage, then the calculation formulas of the action time of two synthetic flux linkage vectors Ta (primary vector), Tb (secondary vector) and the action time of the To zero vector are:
Ta＝M×U×sinα×T/0.866
Tb＝M×U×sin(60-α)×T/0.866
To＝T-Ta-Tb
to further prove the difference between the space vector pulse width modulation method provided by the present invention and the vector allocation of each interval in the conventional 7-segment code symmetric space vector pulse width modulation method, as shown in fig. 5(a) and 5(b), a vector allocation diagram of each interval in the 7-segment code symmetric space vector pulse width modulation method and a vector allocation diagram of each interval in the space vector pulse width modulation method provided by the present invention are respectively shown.
As shown in fig. 5(a) and 5(b), in the 7-segment code symmetric space vector pwm method and the space vector pwm method disclosed in the present invention, the synthesized flux linkage vectors used in each interval are the same, where A, B, C respectively represents U, V, W three phases, and a high bit indicates that the corresponding phase is 1, and a low bit indicates that the corresponding phase is 0. For example, in the 1-interval, the composite flux linkage vectors used by the 7-segment code symmetric space vector pulse width modulation method are Δ Ψ (100) and Δ Ψ (101), and the zero vectors used are Δ Ψ (000) and Δ Ψ (111), and the composite flux linkage vectors used by the space vector pulse width modulation method disclosed by the present invention are also Δ Ψ (100) and Δ Ψ (101), but only Δ Ψ (111) is used as the zero vector. Specifically, in the 1 zone of fig. 5(a), initially, a, B, and C are all in the low position, which indicates that the corresponding phases are all 0, i.e. when the corresponding vector is Δ Ψ (000), a is raised to the high position after a short time, the U phase corresponding to a is adjusted to 1, when the corresponding vector is Δ Ψ (100), and further, C is also raised to the high position after a short time, when the W phase corresponding to C is adjusted to 1, when the corresponding vector is Δ Ψ (101), and so on, the vector change processes in 7-segment codes are Δ Ψ (000), Δ Ψ (100), Δ Ψ (101), Δ Ψ (11D, Δ Ψ (101), Δ Ψ (100), and Δ Ψ (000), i.e. an interval in which the combined vectors Δ Ψ (100) and Δ Ψ (101) and zero vectors Δ Ψ (000) and Δ Ψ (111) are required, and three arms A, B, C all have phase switching, i.e. the phase switching in the high position and low position is in the 1 zone of fig. 5(B), only the composite vectors Δ Ψ (100) and Δ Ψ (101) and the zero vector Δ Ψ (111) are used, and a is always in a high state, and there is no switching of phase height, that is, in the technical solution disclosed in the present invention, in an interval 1, switching of phase height, that is, no loss, occurs in the arm a, that is, the arm corresponding to U.
In order to further prove the advantages of the space vector pulse width modulation method provided by the present invention in relation to the distribution of vectors in each interval of the conventional 7-segment code symmetric space vector pulse width modulation method, as shown in fig. 6(a) and 6(b), the present invention is a bridge arm switching state experimental waveform diagram of the conventional 7-segment code symmetric space vector pulse width modulation method and the space vector pulse width modulation method provided by the present invention, respectively.
The experimental oscillogram of the switching states of the bridge arms is combined, so that the idle time of about 1/3 of each bridge arm in the space vector pulse width modulation method provided by the invention is ensured to be in a stationary state, and compared with the conventional 7-segment code symmetric space vector pulse width modulation method, the switching frequency of the bridge arms is reduced, and the switching loss is reduced.
As shown in fig. 7, a schematic structural diagram of a space vector pulse width modulation apparatus according to an embodiment of the present invention is described in detail as follows.
In an embodiment of the present invention, the space vector pulse width modulation apparatus includes:
a division area determination unit 710 for determining a plurality of division areas of a flux linkage circle corresponding to the control system.
In the embodiment of the invention, the flux linkage circle is divided into a plurality of divided areas, and vector composition capable of approaching the chord of each divided area is found for each divided area, so that the flux linkage circle is integrally approached to the flux linkage circle, and the space vector pulse width modulation is realized.
As a preferred embodiment of the present invention, the number of the division areas is a multiple of 6, which can form a complete circle cycle.
A synthetic flux vector determination unit 720 for determining two synthetic flux vectors corresponding to the divided sections.
In the embodiment of the invention, each divided interval can be synthesized by two flux linkage vectors of which the average proceeding direction is consistent with the chord of the interval, if the acting time of the two flux linkage vectors is not equal to the period of the divided interval, the frequency of the output three-phase wave is not equal to the frequency of the three-phase wave required to be output, and in order to further enable the acting time of the two flux linkage vectors to be just equal to the period of the divided interval, the acting time needs to be further controlled by filling with zero vectors.
A zero vector determining unit 730, configured to determine a zero vector corresponding to the divided region according to the two composite flux linkage vectors.
In the embodiment of the invention, only one zero vector is selected to fill in each division interval to control the action time, and the switching state of at least one bridge arm of the zero vector is required to be always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors. For example, for a division region between 0 to 60 °, when Δ Ψ (100) and Δ Ψ (101) are selected as a composite flux linkage vector, at this time Δ Ψ (111) can be selected as a zero vector, and at this time, since the first digits of Δ Ψ (100), Δ Ψ (101), and Δ Ψ (111) are all 1, that is, the U phase is in the upper bridge arm conducting state, that is, no matter what action duration and sequence Δ Ψ (100), Δ Ψ (101), and Δ Ψ (111) are combined, the U phase is always in the upper bridge arm conducting state, that is, in the division region between 0 to 60 °, the U phase corresponding to is always stationary, so as to reduce the switching loss of the U phase bridge arm, compared to the existing 7-segment code symmetric space vector pulse width modulation method, for facilitating software implementation, two zero vectors Δ Ψ (111) and Δ Ψ (000) are symmetrically utilized in each division region, that is, when Δ Ψ (000) is converted into Δ Ψ (100), the U-phase bridge arm needs to be switched from the lower bridge arm conducting state to the upper bridge arm conducting state, and therefore the space vector pulse width modulation method provided by the invention can theoretically reduce the switching loss 1/3 of each phase bridge arm.
An action period determining unit 740 for determining action periods of two synthetic flux linkage vectors and a zero vector corresponding to the divided sections.
In the embodiment of the present invention, in order to output a three-phase sine wave meeting the requirement, the vector composition of each interval needs to be exactly corresponding to the chord phase of the flux linkage circle corresponding to the three-phase sine wave on each interval, that is, the action time periods of two synthesized flux linkage vectors and a zero vector corresponding to each divided interval need to be further designed according to the output requirement, so as to ensure that the output voltage and the frequency of the output three-phase sine wave meet the requirement.
After determining two synthesized flux linkage vectors used in each division area of a flux linkage circle corresponding to the control system, the space vector pulse width modulation device provided by the embodiment of the invention selects a zero vector in which the switching state of at least one bridge arm is always the same as the switching state of the bridge arm corresponding to the two synthesized flux linkage vectors, so that the switching state of one bridge arm can be always kept unchanged in each division area, that is, the time of 1/3 for each switch in a complete period is kept unchanged.
The embodiment of the invention also provides a space vector pulse width modulation system, which comprises a control system for driving the three-phase motor by using the inverter and a complex programmable logic device, wherein the complex programmable logic device controls the inverter to drive the three-phase motor by using the space vector pulse width modulation method shown in fig. 2.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A space vector pulse width modulation method is applied to a control system for driving a three-phase motor by an inverter, and comprises the following steps:
determining a plurality of division areas of a flux linkage circle corresponding to the control system;
determining two synthetic flux linkage vectors corresponding to the partitioned regions; the synthetic flux linkage vector corresponds to the switching states of the three bridge arms;
determining a zero vector corresponding to the divided regions according to the two synthetic flux linkage vectors; the switching state of at least one bridge arm of the zero vector is always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors;
determining an action period of two resultant flux linkage vectors and a zero vector corresponding to the divided regions.
2. The space vector pulse width modulation method according to claim 1, wherein the step of determining two composite flux linkage vectors corresponding to the divided regions specifically comprises:
and determining two synthetic flux linkage vectors corresponding to the divided areas according to the chord phase of the divided areas.
3. The space vector pulse width modulation method according to claim 1, wherein the step of determining the action periods of the two composite flux linkage vectors and the zero vector corresponding to the divided regions specifically comprises:
determining action duration of two synthetic flux linkage vectors and zero vectors corresponding to the divided regions;
determining the action sequence of two synthetic flux linkage vectors and a zero vector corresponding to the divided regions;
and determining action time periods of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions according to action durations and action sequences of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions.
4. The space vector pulse width modulation method according to claim 3, wherein the step of determining the duration of action of the two composite flux linkage vectors and the zero vector corresponding to the divided regions specifically comprises:
determining the action time of two synthetic flux linkage vectors corresponding to the divided regions according to the amplitude modulation ratio and the required output voltage;
and determining the action time of a zero vector corresponding to the division regions according to the carrier frequency and the action times of the two synthetic flux linkage vectors.
5. The space vector pulse width modulation method according to claim 3, wherein the step of determining the action sequence of the two composite flux linkage vectors and the zero vector corresponding to the divided regions specifically comprises:
and determining the action sequence of two synthetic flux linkage vectors and a zero vector corresponding to the divided regions according to the principle that the number of times of switching states of the bridge arms is the minimum.
6. The space vector pulse width modulation method according to claim 1, wherein the number of the divisional areas is a multiple of 6.
7. A space vector pulse width modulation apparatus, comprising:
a division area determining unit configured to determine a plurality of division areas of a flux linkage circle corresponding to the control system;
a synthetic flux vector determination unit for determining two synthetic flux vectors corresponding to the divided sections; the synthetic flux linkage vector corresponds to the switching states of the three bridge arms;
a zero vector determining unit for determining a zero vector corresponding to the divided regions from the two synthetic flux linkage vectors; the switching state of at least one bridge arm of the zero vector is always the same as the switching state of the corresponding bridge arm of the two flux linkage vectors;
an action period determining unit for determining action periods of two synthetic flux linkage vectors and a zero vector corresponding to the divided sections.
8. The space vector pulse width modulation device according to claim 7, wherein the action period determining unit comprises:
the action duration determining module is used for determining action durations of two synthetic flux linkage vectors and zero vectors corresponding to the divided regions;
an action sequence determining module, configured to determine an action sequence of two synthetic flux linkage vectors and a zero vector corresponding to the divided regions;
and the action time period determining module is used for determining action time periods of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions according to action time lengths and action sequences of the two synthetic flux linkage vectors and the zero vector corresponding to the divided regions.
9. The space vector pulse width modulation device according to claim 8, wherein the action duration determining module comprises:
the synthetic flux linkage vector action time determining submodule is used for respectively determining action time of two synthetic flux linkage vectors corresponding to the divided regions according to the amplitude modulation ratio and the required output voltage;
and the zero vector action time determining submodule is used for determining the action time of the zero vector corresponding to the divided regions according to the carrier frequency and the action time of the two synthetic flux linkage vectors.
10. A space vector pulse width modulation system comprising a control system for driving a three-phase motor with an inverter and a complex programmable logic device for controlling the inverter to drive the three-phase motor using the space vector pulse width modulation method according to any one of claims 1 to 6.
CN202010257263.6A 2020-04-03 2020-04-03 Space vector pulse width modulation method, device and system Pending CN111510004A (en)

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