CN106452148B - Three-level three-phase four-bridge arm inversion system and its control method and controller - Google Patents
Three-level three-phase four-bridge arm inversion system and its control method and controller Download PDFInfo
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- CN106452148B CN106452148B CN201611103880.0A CN201611103880A CN106452148B CN 106452148 B CN106452148 B CN 106452148B CN 201611103880 A CN201611103880 A CN 201611103880A CN 106452148 B CN106452148 B CN 106452148B
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
Abstract
The present invention provides a kind of three-level three-phase four-bridge arm inversion system and its control method and controller, judges whether total input voltage of the three-level three-phase four-bridge arm inversion system rises above default ceiling value by controller；And when total input voltage rises above the default ceiling value, control the switching tube normal open of centre two of four bridge legs in the three-level three-phase four-bridge arm inversion system, upper and lower two switching tube normal offs, so that the three-level three-phase four-bridge arm inversion system is converted into three-phase four-wire system, the alternating current filter midpoint of system can be led back, the common-mode voltage that it is exported is controlled, the common-mode voltage of system is inhibited when total input voltage is higher, the three-level three-phase four-bridge arm inversion system is set to remain the function with unbalanced load, adaptability is enhanced simultaneously, expand the application range of three-level three-phase four-bridge arm inversion system.
Description
Technical field
The present invention relates to three-phase four-arm reverse control technology field, in particular to a kind of three-level three-phase four-bridge arm inversion
System and its control method and controller.
Background technique
Three-level three-phase four-bridge arm inversion system due to its can 100% unbalanced load of band ability, it will be light storage
One application trend in field.When three-level three-phase four-bridge arm inversion system is applied to photovoltaic art, total input voltage meeting
Change with the variation of the factors such as output power, environment temperature, intensity of illumination；When three-level three-phase four-bridge arm inversion system is answered
When for energy storage field, since the output voltage of energy storage device (battery) is also related with the depth of charged/discharged, storing up
In energy field, total input voltage of the three-level three-phase four-bridge arm inversion system is also variation.
But since there are certain common-mode voltages for the output of three-level three-phase four-bridge arm inversion system, and common mode electricity
Pressure can also increase with the raising of total input voltage；Therefore, in the higher situation of total input voltage, four bridge of three-level three-phase
The common-mode voltage of arm inversion system can be higher.
However some loads are more sensitive to common-mode voltage, therefore, three-level three-phase four-bridge arm inversion system is for load
It is more demanding, adaptability is not strong, to limit the application range of three-level three-phase four-bridge arm inversion system.
Summary of the invention
The present invention provides a kind of three-level three-phase four-bridge arm inversion system and its control method and controller, existing to solve
The total input voltage height of technology will lead to the high problem of common-mode voltage.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of control method of three-level three-phase four-bridge arm inversion system is applied to the three-level three-phase four-bridge arm inversion
The control method of the controller of system, the three-level three-phase four-bridge arm inversion system includes:
Judge whether total input voltage of the three-level three-phase four-bridge arm inversion system rises above default ceiling value；
If total input voltage rises above the default ceiling value, it is inverse to control the three-level three-phase four-bridge arm
The switching tube normal open of the centre of four bridge legs two, upper and lower two switching tube normal offs in change system；
Wherein, two switching tubes up and down are respectively an input terminal and the three-level three-phase in the four bridge legs
The connected switching tube of the DC side anode of four bridge legs inversion system and an input terminal and the three-level three-phase four-bridge arm inversion
The connected switching tube of the DC side cathode of system, the switching tube of the centre two are in the four bridge legs except described two up and down
Two switching tubes outside switching tube.
Preferably, the centre two of four bridge legs switchs in the control three-level three-phase four-bridge arm inversion system
After pipe normal open, upper and lower two switching tube normal offs, further includes:
The other three bridge arm in the three-level three-phase four-bridge arm inversion system is respectively opened using pulsewidth modulation strategy PWM
Pipe is closed to be controlled.
Preferably, described to use pulsewidth modulation strategy PWM in the three-level three-phase four-bridge arm inversion system other three
Each switching tube of a bridge arm is controlled, comprising:
Using Sine Wave Pulse Width Modulation strategy SPWM to the other three bridge in the three-level three-phase four-bridge arm inversion system
Each switching tube of arm is controlled.
Preferably, further includes:
Judge whether total input voltage drops to less than default lower limit value；The default ceiling value is more than or equal to described
Default lower limit value；
If total input voltage drops to less than the default lower limit value, using PWM respectively to three level three
All switching tubes of four bridge arms of phase four bridge legs inversion system are controlled.
Preferably, it is described using PWM respectively to all of four bridge arms of the three-level three-phase four-bridge arm inversion system
Switching tube is controlled, comprising:
Using space vector pulse width modulation strategy SVPWM respectively to four of the three-level three-phase four-bridge arm inversion system
All switching tubes of bridge arm are controlled.
A kind of controller of three-level three-phase four-bridge arm inversion system, comprising:
First judging unit, for judging whether total input voltage of the three-level three-phase four-bridge arm inversion system rises
Ceiling value is preset to being greater than；
First control unit, if rising above the default ceiling value for total input voltage, described in control
The switching tube normal open of the centre of four bridge legs two, upper and lower two switching tube normal offs in three-level three-phase four-bridge arm inversion system；
Wherein, two switching tubes up and down are respectively an input terminal and the three-level three-phase in the four bridge legs
The connected switching tube of the DC side anode of four bridge legs inversion system and an input terminal and the three-level three-phase four-bridge arm inversion
The connected switching tube of the DC side cathode of system, the switching tube of the centre two are in the four bridge legs except described two up and down
Two switching tubes outside switching tube.
Preferably, further includes:
Second control unit, for being controlled in the three-level three-phase four-bridge arm inversion system in four bridge legs described
Between after two switching tube normal opens, upper and lower two switching tube normal offs, using PWM to the three-level three-phase four-bridge arm inversion system
Each switching tube of middle the other three bridge arm is controlled.
Preferably, second control unit is used for using PWM to another in the three-level three-phase four-bridge arm inversion system
When each switching tube of outer three bridge arms is controlled, it is specifically used for:
It is controlled using each switching tube of the SPWM to the other three bridge arm in the three-level three-phase four-bridge arm inversion system
System.
Preferably, further includes:
Second judgment unit, for judging whether total input voltage drops to less than default lower limit value；It is described default
Ceiling value is more than or equal to the default lower limit value；
Third control unit, if dropping to less than the default lower limit value for total input voltage, using PWM points
All switching tubes of other four bridge arms to the three-level three-phase four-bridge arm inversion system control.
Preferably, the third control unit is used for using PWM respectively to the three-level three-phase four-bridge arm inversion system
All switching tubes of four bridge arms when being controlled, be specifically used for:
All switching tubes of four bridge arms of the three-level three-phase four-bridge arm inversion system are carried out respectively using SVPWM
Control.
A kind of three-level three-phase four-bridge arm inversion system, comprising: inverter circuit, alternating current filter and controller；Wherein: institute
Controller is stated for executing the control method of any of the above-described three-level three-phase four-bridge arm inversion system.
Preferably, the switching tube in four bridge arms of the three-level three-phase four-bridge arm inversion system is multiple switch pipe string
Assembly after parallel connection.
The control method of three-level three-phase four-bridge arm inversion system provided by the invention judges three electricity by controller
Whether total input voltage of flat three-phase four-arm inversion system rises above default ceiling value；And on total input voltage
When being raised to greater than the default ceiling value, the centre two of four bridge legs in the three-level three-phase four-bridge arm inversion system is controlled
Switching tube normal open, upper and lower two switching tube normal offs, so that the three-level three-phase four-bridge arm inversion system is converted into three-phase and four-line
The alternating current filter midpoint of system can be led back, is controlled to the common-mode voltage that it is exported, in total input voltage by system processed
The common-mode voltage that system is inhibited when higher makes the three-level three-phase four-bridge arm inversion system remain the function with unbalanced load
Can, while adaptability is enhanced, expand the application range of three-level three-phase four-bridge arm inversion system.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure chart of three-level three-phase four-bridge arm inversion system provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system control method process
Figure；
Fig. 3 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system equivalent structure figure；
Fig. 4 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system control method another stream
Cheng Tu；
Fig. 5 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system control method another stream
Cheng Tu；
Fig. 6 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system controller structural representation
Figure；
Fig. 7 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system controller another structure
Schematic diagram；
Fig. 8 be another embodiment of the present invention provides three-level three-phase four-bridge arm inversion system controller another structure
Schematic diagram.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
The present invention provides a kind of control method of three-level three-phase four-bridge arm inversion system, is always inputted with solving the prior art
Voltage height will lead to the high problem of common-mode voltage.
Specifically, the control method of the three-level three-phase four-bridge arm inversion system, it is inverse to be applied to three-level three-phase four-bridge arm
The controller of change system；As shown in Figure 1, the three-level three-phase four-bridge arm inversion system includes: inverter circuit 101, ac filter
Device 102 and controller；It wherein, include four bridge arms in inverter circuit 101, the first bridge arm includes four switch transistor Ts11、T12、T13
And T14, the second bridge arm includes four switch transistor Ts21、T22、T23And T24, third bridge arm includes four switch transistor Ts31、T32、T33With
T34, four bridge legs include four switch transistor Ts41、T42、T43And T44。
Referring to fig. 2, the control method of three-level three-phase four-bridge arm inversion system includes:
S101, judge whether total input voltage of three-level three-phase four-bridge arm inversion system rises above default high limit
Value；
If total input voltage rises above default ceiling value, S102 is thened follow the steps；
S102, it controls the switching tube normal open of centre two of four bridge legs in three-level three-phase four-bridge arm inversion system, is upper and lower
Two switching tube normal offs；
Wherein, which is respectively an input terminal and three-level three-phase four-bridge arm inversion in four bridge legs
Connected switching tube (the i.e. T in Fig. 1 of the DC side anode of system41) and input terminal and three-level three-phase four-bridge arm contravariant system
Connected switching tube (the i.e. T in Fig. 1 of the DC side cathode of system44), the switching tube of the centre two is in four bridge legs except this is upper and lower
Two switching tube (i.e. T in Fig. 1 outside two switching tubes42And T43)。
In Fig. 1, total input voltage of the three-level three-phase four-bridge arm inversion system is Udc, according to specific application environment,
Systemic presupposition has default ceiling value Uuplimit；When total input voltage gradually rises to Udc>UuplimitWhen, illustrate three level at this time
Total input voltage of three-phase four-arm inversion system is excessively high by the common-mode voltage that will lead to its output, may be to the application of load
Bring corresponding problem, it is therefore desirable to inhibit to the common-mode voltage of the three-level three-phase four-bridge arm inversion system.
By step S102, the controller of the three-level three-phase four-bridge arm inversion system will control three-level three-phase four-bridge arm
The switch transistor T of the centre of four bridge legs two in inversion system42And T43Normal open, upper and lower two switch transistor Ts41And T44Normal off, at this point,
The equivalent structure of the three-level three-phase four-bridge arm inversion system is referring to Fig. 3, it is seen that the three-level three-phase four-bridge arm inversion system turns
Three-phase four-wire system is turned to, the midpoint of the ac filter of system can be led back, and then the common-mode voltage that it is exported is subject to
Control.
The control method of three-level three-phase four-bridge arm inversion system provided in this embodiment, by the above process, so that three
Level three-phase four-arm inversion system is converted into three-phase four-wire system, can lead back the alternating current filter midpoint of system, right
Its common-mode voltage exported is controlled, and the common-mode voltage of system is inhibited when total input voltage is higher, makes three level three
Phase four bridge legs inversion system remains the function with unbalanced load, while enhancing adaptability, expands three-level three-phase four
The application range of bridge arm inversion system.
Another embodiment of the present invention additionally provides the control method of another three-level three-phase four-bridge arm inversion system, ginseng
See Fig. 4, comprising:
S201, judge whether total input voltage of three-level three-phase four-bridge arm inversion system rises above default high limit
Value；
If total input voltage rises above default ceiling value, S102 is thened follow the steps；
S202, it controls the switching tube normal open of centre two of four bridge legs in three-level three-phase four-bridge arm inversion system, is upper and lower
Two switching tube normal offs.
It is S203, inverse to three-level three-phase four-bridge arm using PWM (Pulse Width Modulation, pulsewidth modulation strategy)
Each switching tube of the other three bridge arm is controlled in change system；
Specifically, can be using SPWM (Sine Wave Pulse Width Modulation, Sinusoidal PWM) to three-level three-phase four-bridge arm
Each switching tube of the other three bridge arm is controlled in inversion system.
SPWM is with the pulse width PWM waveform equivalent with sine wave, i.e. SPWM waveform, control by sinusoidal rule variation
The on-off of switching device in inverter circuit, the area for the pulse voltage for exporting it and the sine wave of desired output are in respective area
Inverter circuit output voltage is then adjusted by the frequency and amplitude that change modulating wave (the SPWM waveform) in interior area equation
Frequency and amplitude.
When higher this gives a kind of total input voltage, the specific tune of the three-level three-phase four-bridge arm inversion system
Mode processed；Certainly, it is not necessarily limited to this, herein only a kind of example, on the basis of above-described embodiment using any
Suitable modulator approach, can be depending on its specific application environment, within the scope of protection of this application.
Another embodiment of the present invention additionally provides the control method of another three-level three-phase four-bridge arm inversion system,
Further include shown in fig. 5 on the basis of Fig. 2 or Fig. 4:
S301, judge whether total input voltage drops to less than default lower limit value；Default ceiling value is low more than or equal to presetting
Limit value；
If total input voltage drops to less than default lower limit value, S302 is thened follow the steps；
S302, all switching tubes of four bridge arms of three-level three-phase four-bridge arm inversion system are carried out respectively using PWM
Control；
Specifically, SVPWM (space vector pulse width modulation, Space Vector Pulse Width can be used
Modulation) all switching tubes of four bridge arms to three-level three-phase four-bridge arm inversion system are controlled.
In Fig. 1, total input voltage of the three-level three-phase four-bridge arm inversion system is Udc, according to specific application environment,
Systemic presupposition has default lower limit value Udownlimit；When total input voltage drops to Udc<UdownlimitWhen, illustrate three level three at this time
Total input voltage of phase four bridge legs inversion system is too low, and light in the prior art stores up field, it will faces total input voltage benefit
With the low problem of rate.
And the control method of three-level three-phase four-bridge arm inversion system described in the present embodiment, in three-level three-phase four-bridge arm
When total input voltage of inversion system is too low, by controller using SVPWM to four switch transistor Ts of four bridge legs41、T42、T43
With T44It is controlled, realizes the PWM of this four switching tubes, convert three-phase four-arm for three-level three-phase four-bridge arm inversion system
System.
Multiple switching switching due to SVPWM in each minizone pertains only to a device, so switching loss is small；And
The calculating for directly generating three-phase PWM wave using space vector of voltage is simple；In addition, inverter circuit output line voltage fundamental wave maximum value
It is higher by 15% than the inverter circuit output voltage under general SPWM control for total input voltage；Therefore, three described in the present embodiment
The control method of level three-phase four-arm inversion system, can be in total input voltage mistake of three-level three-phase four-bridge arm inversion system
When low, guarantee has higher DC voltage utilization rate.
When total input voltage of the three-level three-phase four-bridge arm inversion system meets Udownlimit<Udc<UuplimitWhen, system
Original control model and operating mode can be maintained, is no longer repeated one by one herein.
It is worth noting that the control method of three-level three-phase four-bridge arm inversion system described in the present embodiment, including Fig. 2
And the combination of Fig. 5 or the combination of Fig. 4 and Fig. 5, no longer repeat one by one herein；Also, step shown in fig. 5 can with Fig. 2 or
Each step in Fig. 4 carries out simultaneously, is not specifically limited herein, within the scope of protection of this application.
Another embodiment of the present invention additionally provides a kind of controller of three-level three-phase four-bridge arm inversion system, referring to Fig. 6,
It include: the first judging unit 201 and first control unit 202；Wherein:
First judging unit 201 is for judging whether total input voltage of three-level three-phase four-bridge arm inversion system rises to
Greater than default ceiling value；
If first control unit 202 is used for total input voltage and rises above default ceiling value, three-level three-phase is controlled
The switching tube normal open of the centre of four bridge legs two, upper and lower two switching tube normal offs in four bridge legs inversion system；
Wherein, which is respectively an input terminal and three-level three-phase four-bridge arm inversion in four bridge legs
Connected switching tube (the i.e. T in Fig. 1 of the DC side anode of system41) and input terminal and three-level three-phase four-bridge arm contravariant system
Connected switching tube (the i.e. T in Fig. 1 of the DC side cathode of system44), the switching tube of the centre two is in four bridge legs except this is upper and lower
Two switching tube (i.e. T in Fig. 1 outside two switching tubes42And T43)。
Preferably, the controller of the three-level three-phase four-bridge arm inversion system, referring to Fig. 7, also wraps on the basis of Fig. 6
It includes:
Second control unit 203, the centre two for the four bridge legs in control three-level three-phase four-bridge arm inversion system
After a switching tube normal open, upper and lower two switching tube normal offs, using PWM (can specifically use SPWM) to four bridge of three-level three-phase
Each switching tube of the other three bridge arm is controlled in arm inversion system.
Preferably, the controller of the three-level three-phase four-bridge arm inversion system, referring to Fig. 8, also wraps on the basis of Fig. 6
It includes: second judgment unit 204 and third control unit 205；Wherein:
Second judgment unit 204 is for judging whether total input voltage drops to less than default lower limit value；Default ceiling value
More than or equal to default lower limit value；
If third control unit 205 is used for total input voltage and drops to less than default lower limit value, (specifically may be used using PWM
To use SVPWM) all switching tubes of four bridge arms of three-level three-phase four-bridge arm inversion system are controlled.
The controller of three-level three-phase four-bridge arm inversion system shown in fig. 8 can also include the second control unit 203,
It is not specifically limited herein.
The controller of three-level three-phase four-bridge arm inversion system provided in this embodiment, by above-mentioned principle, so that three electricity
Flat three-phase four-arm inversion system is converted into three-phase four-wire system, can lead back the alternating current filter midpoint of system, to it
The common-mode voltage of output is controlled, and the common-mode voltage of system is inhibited when total input voltage is higher, makes the three-level three-phase
Four bridge legs inversion system remains the function with unbalanced load, while enhancing adaptability, expands four bridge of three-level three-phase
The application range of arm inversion system.And it can be controlled by SVPWM, in total input of three-level three-phase four-bridge arm inversion system
When brownout, guarantee has higher DC voltage utilization rate.
Another embodiment of the present invention additionally provides a kind of three-level three-phase four-bridge arm inversion system, referring to Fig. 1, comprising: inverse
Power transformation road 101, alternating current filter 102 and controller；It wherein, include four bridge arms in inverter circuit 101, the first bridge arm includes four
A switch transistor T11、T12、T13And T14, the second bridge arm includes four switch transistor Ts21、T22、T23And T24, third bridge arm include four open
Close pipe T31、T32、T33And T34, four bridge legs include four switch transistor Ts41、T42、T43And T44。
The controller is used to judge total input voltage U of inverter circuit 101dcWhether default ceiling value is risen above
Uuplimit；If total input voltage UdcRise above default ceiling value Uuplimit, then four bridge legs in inverter circuit 101 are controlled
Intermediate two switch transistor Ts42And T43Normal open, upper and lower two switch transistor Ts41And T44Normal off；
Wherein, which is respectively an input terminal and three-level three-phase four-bridge arm inversion in four bridge legs
Connected switching tube (the i.e. T in Fig. 1 of the DC side anode of system41) and input terminal and three-level three-phase four-bridge arm contravariant system
Connected switching tube (the i.e. T in Fig. 1 of the DC side cathode of system44), the switching tube of the centre two is in four bridge legs except this is upper and lower
Two switching tube (i.e. T in Fig. 1 outside two switching tubes42And T43)。
Preferably, which is also used to:
The switch transistor T of centre two of four bridge legs in control inverter circuit 10142And T43Normal open, upper and lower two switching tubes
T41And T44After normal off, using PWM (can specifically use SPWM) to the other three in three-level three-phase four-bridge arm inversion system
Each switching tube of bridge arm is controlled.
Preferably, which is also used to:
Judge total input voltage UdcWhether default lower limit value U is dropped to less thandownlimit；If total input voltage UdcDrop to
Less than default lower limit value Udownlimit, then using PWM (can specifically use SVPWM) to three-level three-phase four-bridge arm inversion system
All switching tubes of four bridge arms controlled；Default ceiling value UuplimitMore than or equal to default lower limit value Udownlimit。
Preferably, the DC side of inverter circuit 101 is connected by bus capacitor with photovoltaic battery panel or energy storage device.
Three-level three-phase four-bridge arm inversion system described in the present embodiment can pass through photovoltaic battery panel or energy storage device
It for load supplying, is not specifically limited herein, within the scope of protection of this application.
Preferably, the switching tube in four bridge arms of inverter circuit 101 can be combination of the multiple switch pipe after series-parallel
Body is not specifically limited herein, within the scope of protection of this application.
It is worth noting that three-level three-phase four-bridge arm inversion system described in the present embodiment, is not necessarily limited to Fig. 1
Shown in specific implementation form, for example alternating current filter therein 102 can be LC filter, be also possible to LC, LCL, LCLL
Etc. the filters of other forms be also possible to T font etc. thirdly level topological structure is also not necessarily limited to "-" type shown in FIG. 1, this
Place no longer repeats one by one, within the scope of protection of this application.
Specific working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (12)
1. a kind of control method of three-level three-phase four-bridge arm inversion system, which is characterized in that be applied to the three-level three-phase
The control method of the controller of four bridge legs inversion system, the three-level three-phase four-bridge arm inversion system includes:
Judge whether total input voltage of the three-level three-phase four-bridge arm inversion system rises above default ceiling value；
If total input voltage rises above the default ceiling value, the three-level three-phase four-bridge arm contravariant system is controlled
The switching tube normal open of the centre of four bridge legs two, upper and lower two switching tube normal offs in system；
Wherein, two switching tubes up and down are respectively an input terminal and four bridge of three-level three-phase in the four bridge legs
The connected switching tube of the DC side anode of arm inversion system and an input terminal and the three-level three-phase four-bridge arm inversion system
The connected switching tube of DC side cathode, the switching tube of the centre two is in the four bridge legs except two switches up and down
Two switching tubes outside pipe.
2. the control method of three-level three-phase four-bridge arm inversion system according to claim 1, which is characterized in that described
Control the switching tube normal open of centre two, upper and lower two switching tubes of four bridge legs in the three-level three-phase four-bridge arm inversion system
After normal off, further includes:
Using pulsewidth modulation strategy PWM to each switching tube of the other three bridge arm in the three-level three-phase four-bridge arm inversion system
It is controlled.
3. the control method of three-level three-phase four-bridge arm inversion system according to claim 2, which is characterized in that described to adopt
It is controlled with each switching tube of the pulsewidth modulation strategy PWM to the other three bridge arm in the three-level three-phase four-bridge arm inversion system
System, comprising:
Using Sine Wave Pulse Width Modulation strategy SPWM to the other three bridge arm in the three-level three-phase four-bridge arm inversion system
Each switching tube is controlled.
4. the control method of three-level three-phase four-bridge arm inversion system according to claim 1, which is characterized in that also wrap
It includes:
Judge whether total input voltage drops to less than default lower limit value；The default ceiling value is more than or equal to described default
Lower limit value；
If total input voltage drops to less than the default lower limit value, using pulsewidth modulation strategy PWM respectively to described
All switching tubes of four bridge arms of three-level three-phase four-bridge arm inversion system are controlled.
5. the control method of three-level three-phase four-bridge arm inversion system according to claim 4, which is characterized in that described to adopt
All switching tubes of four bridge arms of the three-level three-phase four-bridge arm inversion system are carried out respectively with pulsewidth modulation strategy PWM
Control, comprising:
Using space vector pulse width modulation strategy SVPWM respectively to four bridge arms of the three-level three-phase four-bridge arm inversion system
All switching tubes controlled.
6. a kind of controller of three-level three-phase four-bridge arm inversion system characterized by comprising
First judging unit, for judging whether total input voltage of the three-level three-phase four-bridge arm inversion system rises to greatly
In default ceiling value；
First control unit controls three electricity if rising above the default ceiling value for total input voltage
The switching tube normal open of centre two of four bridge legs, upper and lower two switching tube normal offs in flat three-phase four-arm inversion system；
Wherein, two switching tubes up and down are respectively an input terminal and four bridge of three-level three-phase in the four bridge legs
The connected switching tube of the DC side anode of arm inversion system and an input terminal and the three-level three-phase four-bridge arm inversion system
The connected switching tube of DC side cathode, the switching tube of the centre two is in the four bridge legs except two switches up and down
Two switching tubes outside pipe.
7. the controller of three-level three-phase four-bridge arm inversion system according to claim 6, which is characterized in that further include:
Second control unit, the centre two for the four bridge legs in the control three-level three-phase four-bridge arm inversion system
After a switching tube normal open, upper and lower two switching tube normal offs, using pulsewidth modulation strategy PWM to the three-level three-phase four-bridge arm
Each switching tube of the other three bridge arm is controlled in inversion system.
8. the controller of three-level three-phase four-bridge arm inversion system according to claim 7, which is characterized in that described second
Control unit is used for using pulsewidth modulation strategy PWM to the other three bridge arm in the three-level three-phase four-bridge arm inversion system
When each switching tube is controlled, it is specifically used for:
Using Sine Wave Pulse Width Modulation strategy SPWM to the other three bridge arm in the three-level three-phase four-bridge arm inversion system
Each switching tube is controlled.
9. according to the controller of any three-level three-phase four-bridge arm inversion system of claim 6 to 8, which is characterized in that
Further include:
Second judgment unit, for judging whether total input voltage drops to less than default lower limit value；The default high limit
Value is more than or equal to the default lower limit value；
Third control unit uses pulsewidth modulation if dropping to less than the default lower limit value for total input voltage
Tactful PWM respectively controls all switching tubes of four bridge arms of the three-level three-phase four-bridge arm inversion system.
10. the controller of three-level three-phase four-bridge arm inversion system according to claim 9, which is characterized in that described
Three control units are used for using pulsewidth modulation strategy PWM respectively to four bridge arms of the three-level three-phase four-bridge arm inversion system
All switching tubes when being controlled, be specifically used for:
Using space vector pulse width modulation strategy SVPWM respectively to four bridge arms of the three-level three-phase four-bridge arm inversion system
All switching tubes controlled.
11. a kind of three-level three-phase four-bridge arm inversion system characterized by comprising inverter circuit, alternating current filter and control
Device；Wherein: the controller requires the control of 1 to 5 any three-level three-phase four-bridge arm inversion system for perform claim
Method processed.
12. three-level three-phase four-bridge arm inversion system according to claim 11, which is characterized in that the three-level three-phase
Switching tube in four bridge arms of four bridge legs inversion system is the assembly after multiple switch pipe is series-parallel.
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| CN109120175B (en) * | 2018-10-15 | 2020-03-24 | 阳光电源股份有限公司 | Modulation method and device of three-level balance bridge circuit |
| CN111049411B (en) * | 2019-11-20 | 2023-01-13 | 天津大学 | Modulation method of three-phase four-leg current source type converter |
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