CN107317506B - Novel seven-segment SVPWM modulation method - Google Patents

Novel seven-segment SVPWM modulation method Download PDF

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CN107317506B
CN107317506B CN201710766780.4A CN201710766780A CN107317506B CN 107317506 B CN107317506 B CN 107317506B CN 201710766780 A CN201710766780 A CN 201710766780A CN 107317506 B CN107317506 B CN 107317506B
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range
control information
voltage
switching tubes
bridge arm
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CN107317506A (en
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侯典立
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Shandong Zhongke Chuangzhi Energy Technology Co., Ltd
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Ludong University
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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
    • H02M7/53875—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 analogue control of three-phase output
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M7/53875—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 analogue control of three-phase output
    • H02M7/53876—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 analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M1/0054—Transistor switching 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 provides a novel seven-segment SVPWM modulation method, wherein the hardware implementation of the modulation method comprises a voltage detection module, an acquisition module and a control module, and the modulation method is characterized in that on the basis of the traditional seven-segment modulation method, the three-phase voltage is detected, the corresponding switch tube is closed within the range of the maximum and minimum value interval of each phase voltage, and the traditional seven-segment modulation method is adopted within the range of the non-maximum and minimum value interval. The invention has the beneficial effects that: the switching times are reduced on the basis of the seven-segment type, namely, the switching loss is reduced, and the switching tube is closed in a certain voltage range, so that the direct connection phenomenon and the reverse power can be prevented.

Description

Novel seven-segment SVPWM modulation method
Technical Field
The invention relates to a PWM (pulse-width modulation) method, in particular to a novel seven-segment SVPWM method.
Background
Voltage Space Vector Pulse Width Modulation (SVPWM) is a relatively novel control method, and its principle is to use different combinations of switch control signals of each bridge arm of the inverter to make the running track of the output voltage space vector of the inverter approximate to a circle. Compared with SPWM, SVPWM has small harmonic component and is easier to realize digitization.
The theoretical basis of SVPWM is the principle of mean value equivalence, i.e. the mean value of a basic voltage vector is made equal to a given voltage vector by combining the basic voltage vectors during a switching cycle. At a certain moment, the rotation of the voltage vector into a certain area can be achieved by different combinations in time of two adjacent non-zero vectors and a zero vector constituting this area. The existing SVPWM modulation method aims at reducing the switching times, only changes the switching state of one phase during each switching conversion, and evenly distributes zero vectors in time to make the generated PWM waves symmetrical, thus realizing the switching by arranging different switching sequences in different intervals and mostly adopting a seven-segment or five-segment space vector operation method. For the seven-segment type, the trigger waveform is symmetrical, the harmonic content is small, but each switching period has 6 times of switching, in order to further reduce the switching times, the sequence arrangement that the state of a certain phase switch in each sector is kept unchanged is adopted, so that each switching period only has 3 times of switching, namely, the five-segment type modulation method, but the harmonic content is increased.
The invention with application number 201511728362.7 provides an SVPWM modulation method and device for optimizing a zero vector, wherein a first sector is defined as a five-segment type modulation sector, the switch states in the middle control period are the switch states corresponding to the zero vector, the switch states in other control periods are the switch states corresponding to the basic voltage space vector of the first sector, and the on-off of the switch tubes of the bridge arms is controlled only by the switch control information that the on-off state of the switch tubes of one group of bridge arms changes during each switching of the switch states; the frequency of the switching operation and the switching losses are reduced. However, this method cannot avoid the direct connection of the upper and lower bridge arm switching tubes, and cannot prevent the generation of reverse power.
The invention provides a novel seven-segment SVPWM modulation method aiming at the problems in the prior art, which not only can further reduce the switching times, but also can avoid the direct connection phenomenon of the switching tubes of the upper bridge arm and the lower bridge arm and the generation of reverse power.
Disclosure of Invention
Aiming at the problems in the prior art, the three-phase voltage value is detected on the basis of the traditional seven-segment SVPWM modulation method, and the three groups of bridge arm switching tubes are correspondingly controlled by combining the seven-segment SVPWM modulation method according to the detection result, so that the switching times are reduced, and the direct connection and reverse power phenomena of the upper bridge arm switching tube and the lower bridge arm switching tube are avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel seven-segment SVPWM modulation method is characterized in that: the sector where the three-phase voltage is positioned is determined by the three-phase current tracking voltage and the three-phase voltage, and when each phase voltage is in the range of the maximum and minimum value interval, a five-segment SVPWM method is adopted, and when each phase voltage is not in the range of the maximum and minimum value interval, a seven-segment modulation method is adopted; the method is used for controlling the on-off of switching tubes of three groups of bridge arms of the three-phase inverter, and the modulation method comprises a voltage detection module, an acquisition module and a control module; the voltage detection module is used for detecting the magnitude of three-phase voltage, completing comparison of the magnitude of the three-phase voltage, determining phase voltage in the range of the maximum or minimum voltage value in the three-phase voltage, and controlling the switch tube of the corresponding bridge arm group according to the detection result of the voltage detection module; the acquisition module is used for acquiring switch control information, and the switch control information comprises control information of a corresponding switch tube output by the voltage detection module and control information corresponding to the seven-segment modulation mode; and the control module is used for controlling the on-off of the switch tube of the bridge arm according to the switch control information.
The SVPWM modulation method based on the seven-segment type is characterized in that: the on-off control working mechanism of the three bridge arm switching tubes takes u-phase voltage as an example, the u-phase voltage is the largest of three-phase voltages in the range of interval voltage Uu > Uv and Uu > Uw, the AC end u-phase voltage flows into a DC negative end through a group a of lower bridge arm switching tubes and transmits power to the DC end through an anti-parallel diode of an upper bridge arm, so that only the switching tube of the lower bridge arm effectively works in the interval, and the switching tube of the upper bridge arm does not need to be on; in the interval, the u-phase voltage is the minimum of three-phase voltages within the range of the interval voltage Uu < Uv and Uu < Uw, in the interval, the transmission of u-phase power to the direct current side needs the switching tube of the upper bridge arm to work effectively, and the switching tube of the lower bridge arm does not need to be conducted, but only the anti-parallel diode of the switching tube works; in two ranges of interval voltage Uv < Uu < Uw and Uv > Uu > Uw, controlling a group of switch tubes a by a classical seven-segment modulation method; in the same way, the control principle is used for controlling the upper and lower switch tubes of the b-group bridge arm and the c-group bridge arm corresponding to the v-phase and the w-phase.
In some embodiments, the control information of the three sets of bridge arm switching tubes is, for example, u-phase voltage, the u-phase voltage is the largest of three-phase voltages within an interval m-n, and the AC-end u-phase voltage flows into the DC negative end through the a set of lower bridge arm switching tubes and transmits power to the DC end, so that in this interval, the voltage detection module outputs control information for turning off the a set of upper bridge arm switching tubes to the acquisition module; in the range of o-p, the u-phase voltage is the minimum of the three-phase voltages, in the range, the voltage detection module outputs control information for closing the switching tubes of the lower bridge arm of the group a to the acquisition module, namely in the range of the two ranges, the voltage detection module outputs corresponding control information for the switching tubes of the upper bridge arm and the lower bridge arm of the group a; and in the ranges of n-o and p-q, controlling the group a of switching tubes by a traditional seven-segment modulation method. Similarly, the voltage detection module outputs corresponding control information of the upper and lower bridge arm switching tubes of the b group and the c group according to the magnitude detection of the v-phase voltage and the w-phase voltage.
The relationship between the switch tube control information and the three-phase voltage is as follows: when u is greater than v and u is greater than w, the switch tubes of the upper bridge arm of the group a are turned off, and when u is less than v and u is less than w, the switch tubes of the lower bridge arm of the group a are turned off; when v is greater than u and v is greater than w, the upper bridge arm switch tubes of the group b are turned off, and when v is less than u and v is less than w, the lower bridge arm switch tubes of the group b are turned off; when w is greater than u and w is greater than v, the upper bridge arm switch tubes of the c groups are turned off, and when w is less than u and w is less than v, the lower bridge arm switch tubes of the c groups are turned off.
The modulation method is not only suitable for AC-DC, but also suitable for DC-AC three-phase inverters.
The invention has the beneficial effects that:
the traditional seven-segment modulation method has symmetrical trigger waveforms and small harmonic content, but each switching period has 6 times of switching, the switching loss is large, and the reliability is relatively low; the five-segment modulation method reduces the switching times on the basis of the seven-segment modulation method, has small switching loss and high reliability, but increases the harmonic content. Compared with the conventional five-segment and seven-segment SVPWM modulation methods, the method provided by the invention has the advantages that the corresponding switching tube is in a conducting or switching-off state in a certain time period by detecting the magnitude of each phase voltage, so that the switching frequency is further reduced, and the switching loss is lower; meanwhile, for two switching tubes of the upper bridge arm and the lower bridge arm, one switching tube is in a turn-off state, so that the straight-through phenomenon of the upper bridge arm and the lower bridge arm can be avoided; in the method, when the voltage of the input end is detected to be larger, the control information for turning off the upper bridge arm switching tube is output, so that the phenomenon of reverse power cannot occur. In conclusion, the reliability of the method of the invention is relatively high.
Drawings
FIG. 1 is a schematic diagram of the AC-DC control process of the method of the present invention;
FIG. 2 is a schematic diagram of the DC-AC control process of the method of the present invention;
FIG. 3 is a schematic diagram of sectors corresponding to different control periods of a u-phase voltage space vector;
FIG. 4 is a schematic diagram of sectors corresponding to different control periods of a v-phase voltage space vector;
FIG. 5 is a schematic diagram of sectors corresponding to different control periods of w-phase voltage space vectors;
fig. 6 is a three-phase voltage waveform analysis diagram.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
fig. 1 is a schematic process diagram of an example of AC-DC control of the method of the present invention, and fig. 2 is a schematic process diagram of an example of DC-AC control of the method of the present invention, that is, the method of the present invention is not only applicable to the AC-DC conversion process shown in fig. 1, but also applicable to the DC-AC conversion process shown in fig. 2. As shown in the two figures, each control module has the same function, and comprises a voltage detection module 11, an acquisition module 12, a control module 13 and a three-phase bridge circuit.
The voltage detection module 11 is used for detecting the magnitude of the u, v and w three-phase voltages, completing comparison of the magnitudes, determining the phase voltage in the maximum or minimum voltage value range in the three-phase voltages, and controlling the switching tube of the corresponding bridge arm according to the detection result of the voltage detection module; the obtaining module 12 is configured to obtain switch control information, where the switch control information includes control information of a corresponding switch tube output by the voltage detecting module and control information corresponding to the seven-segment modulation mode; and the control module 13 is used for controlling the on-off of the switch tube of the bridge arm according to the switch control information.
Fig. 3 is a schematic diagram of sectors corresponding to different control periods of u-phase voltage space vectors, as shown in the diagram, in the prior art, switching values a, b, c and a ', b', c 'are defined to represent the switching states of 6 power switching tubes, when a, b or c is 1, an upper bridge arm switching tube of an inverter bridge is turned on, and a lower bridge arm switching tube thereof is turned off (i.e., a', b 'or c' is 0); on the contrary, when a, b or c is 0, the upper arm switching tube of the inverter bridge is turned off, and the lower arm switching tube thereof is turned on (i.e. a ', b ' or c ' is 1). Because the upper and lower switch tubes of the same bridge arm cannot be conducted simultaneously, the switch tube configuration is 8, for different switch state combinations, 8 basic voltage space vectors can be obtained, two zero voltage space vectors and 6 non-zero voltage space vectors exist, and the 8 combined basic voltage vectors are mapped onto a complex plane, namely as shown in the figure. In the invention, different control time periods of the u-phase voltage space vector shown in fig. 2 correspond to sectors, wherein the duty ratio of the 0-degree linear position corresponding to the a-group switching tubes is 50%, namely the average value of the duty ratio is 0, the sector 1 is the range of the u-phase voltage at the maximum value corresponding to the initial 0-degree position of the u-phase voltage in fig. 6, and corresponds to the m-n interval in fig. 6; the sector 2 is a range in which the u-phase voltage is at the minimum value, and corresponds to an o-p interval in fig. 6, and in the two sector ranges, the u-phase voltage in the maximum or minimum value range is detected by the voltage detection module 11, so that the switching tubes of the corresponding group a are controlled to be switched on or off. Sectors 3 and 4 correspond to the intervals of n-o and p-q in fig. 6, namely seven-segment modulation sectors of the group a switching tube.
Fig. 4 and 5 are schematic diagrams of sectors corresponding to different control periods of space vectors of v-phase voltage and w-phase voltage respectively, which are different from fig. 3 in the position of a 0-degree line and the distribution of each control sector, but the principle is the same, and the distribution of each control sector is similar to that of fig. 3 on the basis of the 0-degree line. The duty ratio of the group b of switching tubes corresponding to the 0-degree line position shown in fig. 4 is 50%, that is, the average value of the duty ratio is 0, the sector 41 corresponds to the initial 0-degree position of the v-phase voltage in fig. 6, and the sector is the range where the v-phase voltage is at the maximum value, and corresponds to the n-s interval in fig. 6; the sector 42 is a range in which the v-phase voltage is at the minimum value, and corresponds to a p-t interval in fig. 6, and in the two sector ranges, the v-phase voltage in the maximum or minimum value range is detected by the voltage detection module 11, so that the corresponding b-group switching tubes are controlled to be switched on or off. The sectors 43 and 44 correspond to the s-p and n-r intervals in fig. 6, namely seven-segment modulation sectors of the group b of switching tubes. The duty ratio of the group c of switching tubes corresponding to the 0 degree line position shown in fig. 5 is 50%, that is, the average value is 0, corresponding to the initial 0 degree position of w-phase voltage in fig. 6, and the sector 51 is the range where the w-phase voltage is at the maximum value, corresponding to the s-q interval in fig. 6; the sector 52 is a range in which the w-phase voltage is at the minimum value, and corresponds to an r-o interval in fig. 6, and in the two sector ranges, the w-phase voltage in the maximum or minimum value range is detected by the voltage detection module 11, so as to control the on or off of the corresponding c-group switching tubes. Sectors 53 and 54 correspond to the q-t and o-s intervals in fig. 6, and are seven-segment modulation sectors of the c-group switching tube.
Fig. 6 is a waveform diagram of three-phase voltage analysis, and it can be seen from the waveform diagram that, taking u-phase voltage as an example, u-phase voltage in an m-n interval range is the largest, control information for closing the switching tubes of the upper bridge arm of the group a is transmitted to the acquisition module 12 after the u-phase voltage is detected to be the largest by the voltage detection module 11 shown in fig. 1, and the u-phase voltage in an o-p interval range is the smallest, a control signal for closing the switching tubes of the lower bridge arm of the group a is transmitted to the acquisition module 12 after the u-phase voltage is detected to be the smallest by the voltage detection module 11 shown in fig. 1 and 2, and the switching tubes of the group a are controlled in an n-o; and similarly, the b group of switching tubes and the c group of switching tubes are respectively controlled by the detection results of the v phase and the w phase.
Namely, the relationship between the control of the three groups of bridge arm switching tubes and the three-phase voltage is as follows:
when u is greater than v and u is greater than w, the switching tubes of the upper bridge arm of the group a are turned off, and the anti-parallel diodes of the upper bridge arm work; and when u is less than v and u is less than w, the switching tubes of the lower bridge arm of the group a are turned off, and the anti-parallel diodes of the lower bridge arm work.
When v is greater than u and v is greater than w, the switching tubes of the upper bridge arms of the group b are turned off, and the anti-parallel diodes of the upper bridge arms work; when v is less than u and v is less than w, the switch tubes of the lower bridge arm of the group b are turned off, and the anti-parallel diodes of the lower bridge arm work.
when w is greater than u and w is greater than v, the switching tubes of the upper bridge arms of the c groups are turned off, and the anti-parallel diodes of the upper bridge arms work; when w is less than u and w is less than v, the switch tubes of the c groups of lower bridge arms are turned off, and the anti-parallel diodes of the lower bridge arms work.
Analysis shows that in one period, at each time period of 30 degrees and different time periods, the control modes of the three groups of bridge arm switching tubes are different, and are respectively as follows:
within the time period of 5, the group a of upper bridge arm switching tubes are turned off, the group b of lower bridge arm switching tubes are turned off, and the group c of switching tubes are controlled in a traditional seven-segment modulation mode; within the time period of 6, the group a of upper bridge arm switching tubes are turned off, the group b of switching tubes are controlled in a traditional seven-segment modulation mode, and the group c of lower bridge arm switching tubes are turned off; in the time period of 7, the group a of switching tubes are controlled in a traditional seven-segment modulation mode, the group b of upper bridge arm switching tubes are turned off, and the group c of lower bridge arm switching tubes are turned off; within the time period of 8, the group a of lower bridge arm switching tubes are closed, the group b of upper bridge arm switching tubes are closed, and the group c of switching tubes are controlled in a traditional seven-segment modulation mode; within the time period of 9, the group a lower bridge arm switching tubes are closed, the group b switching tubes are controlled in a traditional seven-segment modulation mode, and the group c upper bridge arm switching tubes are closed; within the time period of 10, the group a of switching tubes are controlled in a traditional seven-segment modulation mode, the group b of lower bridge arm switching tubes are closed, and the group c of upper bridge arm switching tubes are closed.

Claims (1)

1. A novel SVPWM (Space Vector Pulse Width Modulation) Modulation method based on seven-segment type is used for controlling the on-off of switching tubes of three groups of bridge arms a, b and c of a three-phase inverter and is characterized in that: the modulation method comprises a voltage detection module (11), an acquisition module (12) and a control module (13); the voltage detection module (11) is used for detecting the magnitudes of the three-phase voltages u, v and w, completing comparison of the magnitudes, and determining the phase voltage in the maximum or minimum voltage value range in the three-phase voltages; the acquisition module (12) is used for acquiring switch control information, and the switch control information comprises control information of a corresponding switch tube output by the voltage detection module (11) and control information corresponding to a seven-segment modulation mode; the control module (13) is used for controlling the on-off of the switch tube of the bridge arm according to the switch control information; in the range of m-n, u is greater than v, u is greater than w, the u phase voltage is the maximum of three-phase voltages, the AC end u phase voltage flows into the DC negative end through the a group of lower bridge arm switching tubes and transmits power to the DC end, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the upper bridge arm of the group a to the acquisition module (12), in the range o-p, u < v and u < w, the u-phase voltage is the minimum of the three-phase voltages, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the lower bridge arm of the group a to the acquisition module (12), namely, in the two interval ranges, the voltage detection module (11) can output corresponding control information of the upper and lower switch tubes of the bridge arm of the group a, controlling the group a of switching tubes by a seven-segment modulation method when v < u > u and u < w are in an n-o range and v < u > w and v < u < w are in a p-q range; in the range of n-s, v is greater than u, and v is greater than w, the v phase voltage is the maximum of three-phase voltages, the v phase voltage at the AC end flows into the DC negative end through the b groups of lower bridge arm switching tubes and transmits power to the DC end, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the upper bridge arms of the group b to the acquisition module (12), in the range of p-t, v < u and v < w, the v phase voltage is the minimum of the three-phase voltages, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the lower bridge arm of the group b to the acquisition module (12), namely, in the two interval ranges, the voltage detection module (11) can output corresponding control information of the upper and lower switch tubes of the b groups of bridge arms, controlling the group b of switching tubes by a seven-segment modulation method when v < w and u < u > v and v < w and u < u > u are in an r-n range and an s-p range; in the interval s-q range w > u and w > v, w phase voltage is the largest of three-phase voltage, AC end w phase voltage flows into a DC negative end through c groups of lower bridge arm switching tubes to transmit power to the DC end, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the upper bridge arms of the c groups to the acquisition module (12), in the range of r-o, w < u and w < v, the w phase voltage is the minimum of the three-phase voltages, in the interval, the voltage detection module (11) outputs control information for closing the switching tubes of the c groups of lower bridge arms to the acquisition module (12), namely, in the two interval ranges, the voltage detection module (11) can output corresponding control information of upper and lower switch tubes of the c groups of bridge arms, and controlling the c groups of switching tubes by a seven-segment modulation method when v < w and w < u are in the range o-s and w > u and v < w and w < u are in the range q-t.
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CN1988365A (en) * 2006-12-01 2007-06-27 冶金自动化研究设计院 Dead zone compensating method for space vector pulse width modulating output
CN103138613A (en) * 2013-02-06 2013-06-05 西安理工大学 Control method of matrix convertor

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CN1988365A (en) * 2006-12-01 2007-06-27 冶金自动化研究设计院 Dead zone compensating method for space vector pulse width modulating output
CN103138613A (en) * 2013-02-06 2013-06-05 西安理工大学 Control method of matrix convertor

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