CN106911260A - A kind of control method of multi-electrical level inverter, device and inverter - Google Patents
A kind of control method of multi-electrical level inverter, device and inverter Download PDFInfo
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- CN106911260A CN106911260A CN201710283092.2A CN201710283092A CN106911260A CN 106911260 A CN106911260 A CN 106911260A CN 201710283092 A CN201710283092 A CN 201710283092A CN 106911260 A CN106911260 A CN 106911260A
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- electric capacity
- switching branches
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- level inverter
- voltage
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Classifications
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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
-
- 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
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a kind of control method of multi-electrical level inverter, device and inverter, the control method is by obtaining the DC bus-bar voltage of dc source, when DC bus-bar voltage is more than the first preset voltage value, 3rd electric capacity is charged, make the voltage of the 3rd electric capacity for the second preset voltage value, and control multi-electrical level inverter to be in default hybrid modulation pattern.It can be seen that, this programme is when DC bus-bar voltage is more than the first preset voltage value, 3rd electric capacity is charged, so cause that the voltage carried in first switch branch road and the 6th switching branches reduces, therefore, compared to prior art, the switching tube in first switch branch road and the 6th switching branches need not select the larger switching tube of voltage stress, reduce switching loss and conduction loss.Except this, using hybrid modulation pattern (hybrid modulations of three level and five level), capacitance voltage big ups and downs can be avoided, reduce further the requirement of first switch branch road and the 6th switching branches breaker in middle tube voltage stress.
Description
Technical field
The present invention relates to Photovoltaic new energy technical field, more particularly to a kind of control method of multi-electrical level inverter, device
And inverter.
Background technology
Many level have been output into the common technology in mesohigh high-power frequency conversion field in recent years.Wherein, active midpoint pincers
Position multi-level circuit is conventional multi-level inverter circuit, and it sets at least one suspension electricity by certain position of circuit
Hold so that its level is clamped, form different level outputs.
Conventional five level inverter circuits as shown in figure 1, including multiple switch pipe and fly-wheel diode, wherein, it is multiple
Switching tube carries out turn-on and turn-off according to default logic, and then realizes inversion function, output "+2Ud ", "+Ud ", " 0 ", "-
Ud " and " -2Ud " five kinds of level.Wherein, when "+2Ud " level is exported, switching tube Q1 and switching tube Q7 is turned on, and is now switched
What the voltage at pipe Q6 two ends was usually direct current power source voltage 2Ud 3/4 (to realize five level topology, can tie up the voltage of electric capacity C3
Hold in Ud level), when direct current power source voltage than it is larger when, for example, 1500V, can now cause the voltage at switching tube Q6 two ends compared with
Greatly, 1125V can for example be reached.Inventor has found, because flying capacitor and bus capacitor can voltages in existing modulated process
Fluctuation, and then cause the voltage at switching tube Q6 two ends may to exceed 1200V.Therefore being capable of normal work in order to ensure switching tube Q6
Make, it is necessary to choose the larger switching tube of voltage stress.However, the larger switching tube of voltage stress exist larger switching loss and
Conduction loss, causes system effectiveness relatively low.Equally, during inverter output " -2Ud " level, the voltage at switching tube Q1 two ends
It is generally larger, it is also desirable to choose the larger switching tube of voltage stress.
Therefore, how a kind of control method of multi-electrical level inverter, device and inverter are provided, the consumption of switching tube is reduced
Damage and system effectiveness, be those skilled in the art's big technical problem urgently to be resolved hurrily.
The content of the invention
The present invention provides a kind of control method of multi-electrical level inverter, device and inverter, to solve in the prior art
The consume of multi-electrical level inverter breaker in middle pipe is high and the low problem of system effectiveness.
To realize the purpose, the technical scheme that the application is provided is as follows：
A kind of control method of multi-electrical level inverter, is applied to multi-level inverter circuit, the multi-level inverter circuit bag
Include：First electric capacity, the second electric capacity, the 3rd electric capacity and eight switching branches,
First electric capacity is negative with output with the output plus terminal that the series arm of second electric capacity is connected in parallel on dc source
Between end；
First switch branch road is serially connected between the first end of the 3rd electric capacity and the output plus terminal of the dc source；
Second switch branch road and the 3rd switching branches are serially connected in the second end of first electric capacity and the 3rd electricity
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and the 3rd electricity of second electric capacity
Between the second end for holding；
6th switching branches are serially connected between the second end of the 3rd electric capacity and the output negative terminal of the dc source；
7th switching branches are serially connected in the first end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
The control method, including：
Obtain the DC bus-bar voltage of the dc source；
When the DC bus-bar voltage is more than the first preset voltage value, the 3rd electric capacity is charged, make the described 3rd
The voltage of electric capacity is the second preset voltage value；
The multi-electrical level inverter is controlled to be in default hybrid modulation pattern, the default hybrid modulation pattern includes three electricity
Flat mode of operation and five level active patterns；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the 3rd electric capacity is controlled
It is the 3rd preset voltage value, second preset voltage value is more than the 3rd preset voltage value.
Preferably,
Rated output voltage of first preset voltage value less than or equal to dc source in the multi-electrical level inverter；
Second predeterminated voltage is the first difference voltage with the difference of the 3rd predeterminated voltage, the first difference electricity
Pressure is more than zero；
3rd predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably, the control multi-electrical level inverter is in default hybrid modulation pattern, including：
When the voltage of the modulating wave of multi-electrical level inverter output is more than the 3rd preset voltage value, or, pre- less than the 4th
If during magnitude of voltage, controlling the multi-electrical level inverter to be in the three level actives pattern；
When the voltage of the modulating wave of multi-electrical level inverter output is default more than the 5th less than the 3rd preset voltage value electric
Pressure value, or, when being less than five preset voltage value more than the 4th preset voltage value, controlling at the multi-electrical level inverter
In the five level actives pattern.
Preferably, the control multi-electrical level inverter is in the three level actives pattern, including：
Multi-electrical level inverter output "+2Ud ", " 0 " and " -2Ud " level are controlled,
When wherein inverter is not sent out idle, when "+2Ud " level is exported, the first switch branch road and the described 7th
Switching branches are turned on；
When level "0" is exported, the 4th switching branches and the 8th switching branches are turned on；
When " -2Ud " level is exported, the 6th switching branches and the 8th switching branches are turned on.
Preferably, the control multi-electrical level inverter is in the five level actives pattern, including：
Described multi-electrical level inverter output " Uc ", " 2Ud-Uc ", "-Uc " and "-(2Ud-Uc) " level is controlled,
When wherein inverter is not sent out idle, when " 2Ud-Uc " level is exported, the first switch branch road and described the
Eight switching branches are turned on；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
A kind of control device of multi-electrical level inverter, is applied to multi-level inverter circuit, the multi-level inverter circuit bag
Include：First electric capacity, the second electric capacity, the 3rd electric capacity and eight switching branches,
First electric capacity is negative with output with the output plus terminal that the series arm of second electric capacity is connected in parallel on dc source
Between end；
First switch branch road is serially connected between the first end of the 3rd electric capacity and the output plus terminal of the dc source；
Second switch branch road and the 3rd switching branches are serially connected in the second end of first electric capacity and the 3rd electricity
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and the 3rd electricity of second electric capacity
Between the second end for holding；
6th switching branches are serially connected between the second end of the 3rd electric capacity and the output negative terminal of the dc source；
7th switching branches are serially connected in the first end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
The control device, including：
Acquisition module, the DC bus-bar voltage for obtaining the dc source；
Control module, is used for,
When the DC bus-bar voltage is more than the first preset voltage value, the charging to the 3rd electric capacity makes described the
The voltage of three electric capacity is the second preset voltage value；
The multi-electrical level inverter is controlled to be in default hybrid modulation pattern, the default hybrid modulation pattern includes three electricity
Flat mode of operation and five level active patterns；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the 3rd electric capacity is controlled
It is the 3rd preset voltage value, second preset voltage value is more than the 3rd preset voltage value.
Preferably,
Rated output voltage of first preset voltage value less than or equal to dc source in the multi-electrical level inverter；
Second predeterminated voltage is the first difference voltage with the difference of the 3rd predeterminated voltage, the first difference electricity
Pressure is more than zero；
3rd predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably, the control module includes：
First control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is more than the 3rd predeterminated voltage
Value, or, when being less than four preset voltage values, controlling the multi-electrical level inverter to be in the three level actives pattern；
Second control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is less than the 3rd predeterminated voltage
Value is more than the 5th preset voltage value, or, when being less than five preset voltage value more than the 4th preset voltage value, controlling institute
State multi-electrical level inverter and be in the five level actives pattern.
Preferably, first control unit includes：
First control subelement, for controlling multi-electrical level inverter output "+2Ud ", " 0 " and " -2Ud " level,
When wherein inverter is not sent out idle, when "+2Ud " level is exported, the first switch branch road and the described 7th
Switching branches are turned on；
When level "0" is exported, the 4th switching branches and the 8th switching branches are turned on；
When " -2Ud " level is exported, the 6th switching branches and the 8th switching branches are turned on.
Preferably, second control unit includes：
Second control subelement, for control multi-electrical level inverter output "+Uc ", " 2Ud-Uc ", "-Uc " and "-
(2Ud-Uc) " level,
When wherein inverter is not sent out idle, when " 2Ud-Uc " level is exported, the first switch branch road and described the
Eight switching branches are turned on；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
A kind of inverter, including the above-mentioned control device of any one.
The invention provides a kind of control method of multi-electrical level inverter, device and inverter, the control method passes through
Obtain the DC bus-bar voltage of the dc source；When the DC bus-bar voltage is more than the first preset voltage value, to described
The charging of the 3rd electric capacity, makes the voltage of the 3rd electric capacity for the second preset voltage value, and control at the multi-electrical level inverter
In default hybrid modulation pattern.It can be seen that, this programme fills when DC bus-bar voltage is more than the first preset voltage value to the 3rd electric capacity
Electricity, so that the voltage carried on first switch branch road and the 6th switching branches reduces, therefore, compared to prior art,
Switching tube in first switch branch road and the 6th switching branches need not select the larger switching tube of voltage stress, reduce switch
Loss and conduction loss, and then improve system effectiveness.Except this, in this programme, using hybrid modulation pattern (three level and five electricity
Flat hybrid modulation), the larger fluctuation of electric capacity can be avoided, reduce further first switch branch road and the 6th switching branches
The requirement of middle switch tube voltage stress.
Also, this programme is also when the DC bus-bar voltage is less than or equal to first preset voltage value, and control is described
The voltage of the 3rd electric capacity is the 3rd preset voltage value, wherein, second preset voltage value is more than the 3rd preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, the 3rd electric capacity is controlled for conventional value (1/4 DC bus-bar voltage), it is inverse to ensure many level
Become the normal modulation of device.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the five-electrical level inverter that prior art is provided；
Fig. 2 is the structural representation of the another five-electrical level inverter that prior art is provided；
Fig. 3 is a kind of schematic flow sheet of control method that the present embodiment is provided；
Fig. 4 is that five-electrical level inverter modulates schematic diagram in the prior art；
Fig. 5 is the modulation schematic diagram of five-electrical level inverter in the embodiment of the present invention；
Fig. 6 is the control schematic diagram of five-electrical level inverter provided in an embodiment of the present invention；
Fig. 7 is the control schematic diagram of another five-electrical level inverter provided in an embodiment of the present invention；
Fig. 8 is the structural representation of another five-electrical level inverter provided in an embodiment of the present invention；
Fig. 8-a and 8-b are the application schematic diagrams of the five-electrical level inverter that another embodiment of the present invention is provided；
Fig. 9-a and 9-b are the application schematic diagrams of the two-phase five-electrical level inverter that another embodiment of the present invention is provided；
Figure 10-a and 10-b are that the application of the three-phase three-wire system five-electrical level inverter that another embodiment of the present invention is provided is illustrated
Figure；
Figure 11-a and 11-b are that the application of the three-phase four-wire system five-electrical level inverter that another embodiment of the present invention is provided is illustrated
Figure.
Specific embodiment
To enable the above objects, features and advantages of the present invention more obvious understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
The present invention provides a kind of control method of multi-electrical level inverter, device and inverter, to solve in the prior art
Multi-electrical level inverter breaker in middle pipe consume height and the low problem of system effectiveness.
Specifically, the control method is applied to multi-level inverter circuit, as shown in Fig. 2 the multi-level inverter circuit bag
Include：First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and eight switching branches (10-80).
Specifically, the output that the first electric capacity C1 is connected in parallel on dc source with the series arm of the second electric capacity C2 is just
Between end PV+ (A ends) and output negative terminal PV- (B ends).
First switch branch road 10 is serially connected in the first end P of the 3rd electric capacity C3 and the output plus terminal of the dc source
Between PV+.
The switching branches 30 of second switch branch road 20 and the 3rd are serially connected in the second end N of the first electric capacity C1 and described
Between the first end P of the 3rd electric capacity C3.
4th switching branches 40 and the 5th switching branches 50 are serially connected in the first end N of the second electric capacity C2 and described
Between the second end N of the 3rd electric capacity C3.
6th switching branches 60 are serially connected in the second end N of the 3rd electric capacity C3 and the output negative terminal of the dc source
Between PV-.
7th switching branches 70 be serially connected in the 3rd electric capacity C3 first end P and five level inverter circuit it is defeated
Go out to hold between R.
8th switching branches 80 be serially connected in the 3rd electric capacity C3 the second end N and five level inverter circuit it is defeated
Go out to hold between R.
As stated in the Background Art, inventor in order in reducing first switch branch road and the 6th switching branches switch tube should
The requirement of power, with reference to Fig. 1, it is proposed that a kind of control method, as shown in Fig. 2 including step：
S1, the DC bus-bar voltage Vpv for obtaining the dc source.
S11, when the DC bus-bar voltage Vpv be more than the first preset voltage value V1 when, to the 3rd electric capacity C3 charge,
Make the voltage of the 3rd electric capacity C3 for the second preset voltage value V2, control the multi-electrical level inverter to be in default hybrid modulation
Pattern (hybrid modulations of three level and five level).
S12, when the DC bus-bar voltage Vpv is less than or equal to the first preset voltage value Vset, control described the
The voltage of three electric capacity C3 is the 3rd preset voltage value V3, and the second preset voltage value V2 is more than the 3rd preset voltage value
V3。
Wherein, rated outputs of the first preset voltage value V1 less than or equal to dc source in the multi-electrical level inverter
Voltage.For example when the rated output voltage of dc source is 1500V, then V1 is that may be configured as 1300V or lower, so that
The voltage at AP or NB two ends is lower, consequently facilitating switching tube type selecting or reduction switch tube voltage drop.Second predeterminated voltage
The difference of V2 and the 3rd predeterminated voltage V3 is the first difference voltage Voffset, and the first difference voltage Voffset is more than
Zero, its value can be fixed or enter Mobile state adjustment according to PV voltages etc., for example, can choose 100V or Vpv/8, or foundation
PV voltages and V1 voltage differences change.The 3rd predeterminated voltage V3 is a quarter of the DC bus-bar voltage in this programme,
That is V3=Vpv/4.
It can be seen that, this programme charges when DC bus-bar voltage is more than the first preset voltage value to the 3rd electric capacity, so that
The voltage carried on first switch branch road and the 6th switching branches reduces, therefore, compared to prior art, first switch branch road
And the 6th switching tube in switching branches need not select the larger switching tube of voltage stress, reduce switching loss and conducting is damaged
Consumption, and then improve system effectiveness.Except this, in this programme, using three level active patterns and five level active patterns, can
Capacitance voltage big ups and downs are avoided, switch tube voltage should in reduce further first switch branch road and the 6th switching branches
The requirement of power.
Also, this programme is also when the DC bus-bar voltage is less than or equal to first preset voltage value, and control is described
The voltage of the 3rd electric capacity is the 3rd preset voltage value, wherein, second preset voltage value is more than the 3rd preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, the 3rd electric capacity is controlled for conventional value (1/4 DC bus-bar voltage), it is inverse to ensure many level
Become the normal modulation of device.
Inventor has found that normal five level modulation is as shown in figure 4, in high voltage startup, suspended voltage is uneven to charge, and leads
Cause now suspended voltage fluctuation big.Therefore, on the basis of above-described embodiment, it is described many that the present embodiment additionally provides a kind of control
Electrical level inverter is in the specific works mode of hybrid modulation pattern, as shown in figure 5, including：
When the voltage of the modulating wave Vm of multi-electrical level inverter output is more than the 3rd preset voltage value Vt1, or, less than the
During four preset voltage value Vt2, the multi-electrical level inverter is controlled to be in three level active patterns.
When the voltage of the modulating wave of multi-electrical level inverter output is preset less than the 3rd preset voltage value Vt1 more than the 5th
Magnitude of voltage 0, or, when being less than five preset voltage value 0 more than the 4th preset voltage value Vt2, controlling many level
Inverter is in five level active patterns.
Specifically, with reference to Fig. 6, three level active patterns are：Control multi-electrical level inverter output "+2Ud ", " 0 " with
And " -2Ud " level.
When inverter is not sent out idle：
During output "+2Ud " level, the direction of arrow 1. indicated along figure, the first switch branch road and the described 7th
Switching branches are turned on；
When level "0" is exported, the direction of arrow 2. indicated along figure, the 4th switching branches and the 8th switch are propped up
Road turns on；
When " -2Ud " level is exported, the direction of arrow 3. indicated along figure, the 6th switching branches and described the
Eight switching branches are turned on.
Specifically, five level active patterns, as shown in fig. 7, being：Control multi-electrical level inverter output " Uc ", " 2Ud-
Uc ", "-Uc " and "-(2Ud-Uc) " level.
When wherein inverter is not sent out idle：
When " 2Ud-Uc " level is exported, the direction of arrow 4. indicated along figure, the first switch branch road and described
8th switching branches are turned on；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
It should be noted that in above-described embodiment, be by taking Fig. 1 as an example, wherein, switching branches are a switching tube simultaneously
One structure of diode of connection, however, the control method that this programme is provided, applies also for the multi-electrical level inverter of other structures,
As shown in figure 8, the 3rd switching branches and the 4th switching branches are continued flow switch pipe in the multi-level inverter circuit, other switches
Branch road is non-continued flow switch pipe.Its operation principle refers to above-described embodiment, will not be described in detail herein.
On the basis of above-described embodiment, the present embodiment additionally provides a kind of control device of multi-electrical level inverter, application
In multi-level inverter circuit, the multi-level inverter circuit includes：First electric capacity, the second electric capacity, the 3rd electric capacity and eight open
Close branch road,
First electric capacity is negative with output with the output plus terminal that the series arm of second electric capacity is connected in parallel on dc source
Between end；
First switch branch road is serially connected between the first end of the 3rd electric capacity and the output plus terminal of the dc source；
Second switch branch road and the 3rd switching branches are serially connected in the second end of first electric capacity and the 3rd electricity
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and the 3rd electricity of second electric capacity
Between the second end for holding；
6th switching branches are serially connected between the second end of the 3rd electric capacity and the output negative terminal of the dc source；
7th switching branches are serially connected in the first end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the 3rd electric capacity and the output end of the multi-level inverter circuit
Between；
The control device, including：
Acquisition module, the DC bus-bar voltage for obtaining the dc source；
Control module, is used for,
When the DC bus-bar voltage is more than the first preset voltage value, the charging to the 3rd electric capacity makes described the
The voltage of three electric capacity is the second preset voltage value；
The multi-electrical level inverter is controlled to be in default hybrid modulation pattern；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the 3rd electric capacity is controlled
It is the 3rd preset voltage value, second preset voltage value is more than the 3rd preset voltage value.
Preferably,
Rated output voltage of first preset voltage value less than or equal to dc source in the multi-electrical level inverter；
Second predeterminated voltage is the first difference voltage with the difference of the 3rd predeterminated voltage, the first difference electricity
Pressure is more than zero；
3rd predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably, the control module includes：
First control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is more than the 3rd predeterminated voltage
Value, or, when being less than four preset voltage values, controlling the multi-electrical level inverter to be in three level active patterns；
Second control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is less than the 3rd predeterminated voltage
Value is more than the 5th preset voltage value, or, when being less than five preset voltage value more than the 4th preset voltage value, controlling institute
State multi-electrical level inverter and be in five level active patterns.
Preferably, first control unit includes：
First control subelement, for controlling multi-electrical level inverter output "+2Ud ", " 0 " and " -2Ud " level,
Wherein inverter is not sent out idle constantly：
When "+2Ud " level is exported, the first switch branch road and the 7th switching branches are turned on；
When level "0" is exported, the 4th switching branches and the 8th switching branches are turned on；
When " -2Ud " level is exported, the 6th switching branches and the 8th switching branches are turned on.
Preferably, second control unit includes：
Second control subelement, for control multi-electrical level inverter output "+Uc ", " 2Ud-Uc ", "-Uc " and "-
(2Ud-Uc) " level,
When wherein inverter is not sent out idle：
When " 2Ud-Uc " level is exported, the first switch branch road and the 8th switching branches are turned on；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
The operation principle of the control device refers to above method embodiment, will not be described in detail herein.
On the basis of above-described embodiment, the present embodiment additionally provides a kind of inverter, including the above-mentioned control of any one
Device processed.
In specific practical application, as shown in fig 8-a, second input and output end of the five-electrical level inverter are also
Can be connected with power network by elements (such as electric capacity) such as inductance respectively.The front end of the five-electrical level inverter can also increase by one
Individual DC/DC converters carry out the change of voltage, the input voltage range for widening the five-electrical level inverter.Or, such as
Shown in Fig. 8-b, the front end of the five-electrical level inverter also increases a DC/DC converter to carry out the change of voltage, and its
Two inputs and output end are connected by elements (such as electric capacity) such as inductance with power network respectively.
Another embodiment of the present invention additionally provides a kind of application circuit of five-electrical level inverter, is this reality as shown in Fig. 9-a
The two-phase five-electrical level inverter topological diagram of example offer, including two five-electrical level inverters as described in above-mentioned embodiment are applied, respectively
It is the first five-electrical level inverter 101 and the second five-electrical level inverter 102；Wherein：
The first input end of the first five-electrical level inverter 101 and the second five-electrical level inverter 102 is all connected with the direct current
The anode of source PV；
Second input of the first five-electrical level inverter 101 and the second five-electrical level inverter 102 with the first electric capacity C1 and
The tie point of the second electric capacity C2 is connected；
3rd input of the first five-electrical level inverter 101 and the second five-electrical level inverter 102 is all connected with the direct current
The negative terminal in source；
The output end of the first five-electrical level inverter 101 and the second five-electrical level inverter 102 is inverse respectively as five level
Become two ac output ends of the application circuit of device.
Specifically, the first five-electrical level inverter 101 is modulated by the primary sinusoid, the second five-electrical level inverter 102 by
Second sine wave is modulated；
Phase difference 180 degree or 0 degree of the primary sinusoid and the second sine wave.
Another embodiment of the present invention additionally provides a kind of application circuit of five-electrical level inverter, is this as shown in Figure 10-a
The three-phase three-wire system five-electrical level inverter topological diagram that embodiment is provided, including five level described in three embodiments as discussed above are inverse
Become device, respectively the first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203；Wherein：
The first of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter the anode that end is all connected with the dc source PV；
The second of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter tie point of the end with the first electric capacity C1 and the second electric capacity C2 to be connected；
The 3rd of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter the negative terminal that end is all connected with the dc source；
The output end of the first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203
Respectively as three ac output ends of the application circuit of the five-electrical level inverter.
Specifically, the first five-electrical level inverter 201 is modulated by the primary sinusoid, the second five-electrical level inverter 202 by
Second sine wave is modulated, and the 3rd five-electrical level inverter 203 is modulated by the 3rd sine wave；
The phase of the primary sinusoid, the second sine wave and the 3rd sine wave 120 degree of mutual deviation successively.
Another embodiment of the present invention additionally provides a kind of application circuit of five-electrical level inverter, is this as shown in Figure 11-a
The three-phase four-wire system five-electrical level inverter topological diagram that embodiment is provided, including three five level inverse conversions as described in above-mentioned embodiment
Device, respectively the first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203；Wherein：
The first of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter the anode that end is all connected with the dc source PV；
The second of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter tie point of the end with the first electric capacity C1 and the second electric capacity C2 to be connected；
The 3rd of first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203 is defeated
Enter the negative terminal that end is all connected with the dc source；
The output end of the first five-electrical level inverter 201, the second five-electrical level inverter 202 and the 3rd five-electrical level inverter 203
Respectively as three ac output ends of the application circuit of the five-electrical level inverter；
The tie point of the first electric capacity C1 and the second electric capacity C2 is the 4th defeated as the application circuit of the five-electrical level inverter
Go out end, be connected with three ac output ends by the elements such as power network and inductance (such as also including electric capacity) respectively.
Specifically, the first five-electrical level inverter 201 is modulated by the primary sinusoid, the second five-electrical level inverter 202 by
Second sine wave is modulated, and the 3rd five-electrical level inverter 203 is modulated by the 3rd sine wave；
The phase of the primary sinusoid, the second sine wave and the 3rd sine wave 120 degree of mutual deviation successively.
In specific practical application, the front end of the application circuit of the five-electrical level inverter can also increase a DC/
DC converters carry out the change of voltage, the input voltage range of the application circuit for widening the five-electrical level inverter.Institute
Each ac output end for stating the application circuit of five-electrical level inverter (for example can also also include electricity by elements such as inductance respectively
Hold) it is connected with power network.Or as shown in Fig. 9-b, 10-b and 11-b, the application circuit of each five-electrical level inverter, before it
End increases a DC/DC converter to carry out the change of voltage, and its each ac output end also respectively by elements such as inductance
It is connected with power network.
The application circuit of each five-electrical level inverter described in above-described embodiment, can be applied to photovoltaic generating system, phase
Answer, the dc source is photovoltaic cell component.Or the application circuit of each five-electrical level inverter can also be applied to
Other electricity generation systems, are not specifically limited herein.
It should be noted that five-electrical level inverter provided in an embodiment of the present invention realizes the function of preventing capacitance short-circuit,
It is understood that the two-phase, three-phase three-wire system and the three-phase four-wire system five-electrical level inverter that are made up of the five-electrical level inverter
Equally there is the advantage.
To sum up, the invention provides a kind of control method of multi-electrical level inverter, device and inverter, the control method
By the DC bus-bar voltage for obtaining the dc source；It is right when the DC bus-bar voltage is more than the first preset voltage value
3rd electric capacity charges, and makes the voltage of the 3rd electric capacity for the second preset voltage value, and control the multi-electrical level inverter
In three level active patterns and five level active patterns.It can be seen that, this programme is more than the first predeterminated voltage in DC bus-bar voltage
During value, the 3rd electric capacity is charged, so that the voltage carried on first switch branch road and the 6th switching branches reduces, because
This, compared to prior art, the switching tube in first switch branch road and the 6th switching branches need not be larger from voltage stress
Switching tube, reduce switching loss and conduction loss, and then improve system effectiveness.Except this, in this programme, using three level
Mode of operation and five level active patterns, can avoid capacitance voltage big ups and downs, reduce further first switch branch road
And the 6th switch tube voltage stress in switching branches requirement.
Also, this programme is also when the DC bus-bar voltage is less than or equal to first preset voltage value, and control is described
The voltage of the 3rd electric capacity is the 3rd preset voltage value, wherein, second preset voltage value is more than the 3rd preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, the 3rd electric capacity is controlled for conventional value (1/4 DC bus-bar voltage), it is inverse to ensure many level
Become the normal modulation of device.
But above-described embodiment, only it is presently preferred embodiments of the present invention, not make any formal to the present invention
Limitation.Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.It is any to be familiar with this area
Technical staff, in the case where technical solution of the present invention ambit is not departed from, all using the methods and techniques content pair of the disclosure above
Technical solution of the present invention makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every
Without departing from the content of technical solution of the present invention, any simply repaiied to made for any of the above embodiments according to technical spirit of the invention
Change, equivalent variations and modification, still fall within the range of technical solution of the present invention protection.
Claims (11)
1. a kind of control method of multi-electrical level inverter, is applied to multi-level inverter circuit, it is characterised in that many level are inverse
Becoming circuit includes：First electric capacity, the second electric capacity, the 3rd electric capacity and eight switching branches,
First electric capacity and the series arm of second electric capacity be connected in parallel on dc source output plus terminal and output negative terminal it
Between；
First switch branch road is serially connected between the first end of the 3rd electric capacity and the output plus terminal of the dc source；
Second switch branch road and the 3rd switching branches are serially connected in the second end of first electric capacity and the 3rd electric capacity
Between first end；
4th switching branches and the 5th switching branches are serially connected in the first end and the 3rd electric capacity of second electric capacity
Between second end；
6th switching branches are serially connected between the second end of the 3rd electric capacity and the output negative terminal of the dc source；
7th switching branches are serially connected between the first end of the 3rd electric capacity and the output end of the multi-level inverter circuit；
8th switching branches are serially connected between the second end of the 3rd electric capacity and the output end of the multi-level inverter circuit；
The control method includes：
Obtain the DC bus-bar voltage of the dc source；
When the DC bus-bar voltage is more than the first preset voltage value, the 3rd electric capacity is charged, make the 3rd electric capacity
Voltage be the second preset voltage value；
The multi-electrical level inverter is controlled to be in default hybrid modulation pattern, the default hybrid modulation pattern includes three level works
Operation mode and five level active patterns；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage for control the 3rd electric capacity is the
Three preset voltage values, second preset voltage value is more than the 3rd preset voltage value.
2. control method according to claim 1, it is characterised in that
Rated output voltage of first preset voltage value less than or equal to dc source in the multi-electrical level inverter；
Second predeterminated voltage is the first difference voltage with the difference of the 3rd predeterminated voltage, and first difference voltage is big
In zero；
3rd predeterminated voltage is a quarter of the DC bus-bar voltage.
3. control method according to claim 1, it is characterised in that the control multi-electrical level inverter is in default
Hybrid modulation pattern, including：
When the voltage of the modulating wave of multi-electrical level inverter output is more than the 3rd preset voltage value, or, less than the 4th default electricity
During pressure value, the multi-electrical level inverter is controlled to be in the three level actives pattern；
When the voltage of the modulating wave of multi-electrical level inverter output is more than the 5th preset voltage value less than the 3rd preset voltage value,
Or, when being less than five preset voltage value more than the 4th preset voltage value, controlling the multi-electrical level inverter to be in institute
State five level active patterns.
4. control method according to claim 3, it is characterised in that the control multi-electrical level inverter is in described
Three level active patterns, including：
Multi-electrical level inverter output "+2Ud ", " 0 " and " -2Ud " level are controlled,
When wherein inverter is not sent out idle, when export "+2Ud " level when, the first switch branch road and it is described 7th switch
Branch road is turned on；
When level "0" is exported, the 4th switching branches and the 8th switching branches are turned on；
When " -2Ud " level is exported, the 6th switching branches and the 8th switching branches are turned on.
5. control method according to claim 3, it is characterised in that the control multi-electrical level inverter is in described
Five level active patterns, including：
Described multi-electrical level inverter output " Uc ", " 2Ud-Uc ", "-Uc " and "-(2Ud-Uc) " level is controlled,
When wherein inverter is not sent out idle, when " 2Ud-Uc " level is exported, the first switch branch road and the described 8th open
Close branch road conducting；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
6. a kind of control device of multi-electrical level inverter, is applied to multi-level inverter circuit, it is characterised in that many level are inverse
Becoming circuit includes：First electric capacity, the second electric capacity, the 3rd electric capacity and eight switching branches,
First electric capacity and the series arm of second electric capacity be connected in parallel on dc source output plus terminal and output negative terminal it
Between；
First switch branch road is serially connected between the first end of the 3rd electric capacity and the output plus terminal of the dc source；
Second switch branch road and the 3rd switching branches are serially connected in the second end of first electric capacity and the 3rd electric capacity
Between first end；
4th switching branches and the 5th switching branches are serially connected in the first end and the 3rd electric capacity of second electric capacity
Between second end；
6th switching branches are serially connected between the second end of the 3rd electric capacity and the output negative terminal of the dc source；
7th switching branches are serially connected between the first end of the 3rd electric capacity and the output end of the multi-level inverter circuit；
8th switching branches are serially connected between the second end of the 3rd electric capacity and the output end of the multi-level inverter circuit；
The control device includes：
Acquisition module, the DC bus-bar voltage for obtaining the dc source；
Control module, is used for,
When the DC bus-bar voltage is more than the first preset voltage value, the charging to the 3rd electric capacity makes the 3rd electricity
The voltage of appearance is the second preset voltage value；
The multi-electrical level inverter is controlled to be in default hybrid modulation pattern, the default hybrid modulation pattern includes three level works
Operation mode and five level active patterns；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage for control the 3rd electric capacity is the
Three preset voltage values, second preset voltage value is more than the 3rd preset voltage value.
7. control device according to claim 6, it is characterised in that
Rated output voltage of first preset voltage value less than or equal to dc source in the multi-electrical level inverter；
Second predeterminated voltage is the first difference voltage with the difference of the 3rd predeterminated voltage, and first difference voltage is big
In zero；
3rd predeterminated voltage is a quarter of the DC bus-bar voltage.
8. control device according to claim 6, it is characterised in that the control module includes：
First control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is more than the 3rd preset voltage value,
Or, when being less than four preset voltage values, controlling the multi-electrical level inverter to be in the three level actives pattern；
Second control unit, the voltage of the modulating wave for being exported when the multi-electrical level inverter is big less than the 3rd preset voltage value
In the 5th preset voltage value, or, when being less than five preset voltage value more than the 4th preset voltage value, controlling described many
Electrical level inverter is in the five level actives pattern.
9. control device according to claim 8, it is characterised in that first control unit includes：
First control subelement, for controlling multi-electrical level inverter output "+2Ud ", " 0 " and " -2Ud " level,
When wherein inverter is not sent out idle, when export "+2Ud " level when, the first switch branch road and it is described 7th switch
Branch road is turned on；
When level "0" is exported, the 4th switching branches and the 8th switching branches are turned on；
When " -2Ud " level is exported, the 6th switching branches and the 8th switching branches are turned on.
10. control device according to claim 8, it is characterised in that second control unit includes：
Second control subelement, for control multi-electrical level inverter output "+Uc ", " 2Ud-Uc ", "-Uc " and "-
(2Ud-Uc) " level,
When wherein inverter is not sent out idle, when " 2Ud-Uc " level is exported, the first switch branch road and the described 8th open
Close branch road conducting；
When " Uc " level is exported, the 5th switching branches and the 7th switching branches are turned on；
When "-Uc " level is exported, the 3rd switching branches and the 8th switching branches are turned on；
When "-(2Ud-Uc) " level is exported, the 6th switching branches and the 7th switching branches are turned on.
11. a kind of inverters, it is characterised in that including the control device as described in any one in claim 6-10.
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| CN201810213600.4A CN108418455B (en) | 2017-04-26 | 2018-03-15 | A kind of control method of multi-electrical level inverter, device and inverter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109756138A (en) * | 2019-01-29 | 2019-05-14 | 河海大学 | A kind of control circuit of five Level Full Bridges inverter |
| CN111697861A (en) * | 2020-06-22 | 2020-09-22 | 周衍 | Multilevel soft switch inversion driving system and voltage window switching method thereof |
| CN112886846A (en) * | 2021-02-26 | 2021-06-01 | 江苏师范大学 | Hybrid clamp five-level voltage source type converter and control method |
| CN113098306A (en) * | 2021-03-30 | 2021-07-09 | 北京交通大学 | Modulation control method for five-level and multi-level laminated multi-unit converter |
| CN113258804A (en) * | 2021-05-19 | 2021-08-13 | 山东大学 | Five-level photovoltaic inverter capable of reducing number of switching tubes and modulation method thereof |
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| CN113067473B (en) * | 2020-01-02 | 2022-05-24 | 阳光新能源开发股份有限公司 | Control signal modulation circuit, inverter and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104467499B (en) * | 2015-01-04 | 2017-02-22 | 阳光电源股份有限公司 | Five-level inverter neutral-point balancing control method and system |
| CN105141158B (en) * | 2015-09-28 | 2018-02-16 | 阳光电源股份有限公司 | A kind of control method of multi-electrical level inverter, apparatus and system |
| CN105226978B (en) * | 2015-10-10 | 2018-04-10 | 阳光电源股份有限公司 | A kind of five-electrical level inverter and its application circuit |
| CN106169884B (en) * | 2016-06-30 | 2019-02-01 | 阳光电源股份有限公司 | The precharge control method and device of five-level active neutral-point-clamped type inverter |
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2017
- 2017-04-26 CN CN201710283092.2A patent/CN106911260A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109756138A (en) * | 2019-01-29 | 2019-05-14 | 河海大学 | A kind of control circuit of five Level Full Bridges inverter |
| CN111697861A (en) * | 2020-06-22 | 2020-09-22 | 周衍 | Multilevel soft switch inversion driving system and voltage window switching method thereof |
| WO2021259091A1 (en) * | 2020-06-22 | 2021-12-30 | 周衍 | Multi-level soft-switching inversion driving system and voltage window switching method therefor |
| CN112886846A (en) * | 2021-02-26 | 2021-06-01 | 江苏师范大学 | Hybrid clamp five-level voltage source type converter and control method |
| CN113098306A (en) * | 2021-03-30 | 2021-07-09 | 北京交通大学 | Modulation control method for five-level and multi-level laminated multi-unit converter |
| CN113098306B (en) * | 2021-03-30 | 2022-06-17 | 北京交通大学 | Modulation control method for five-level and multi-level laminated multi-unit converter |
| CN113258804A (en) * | 2021-05-19 | 2021-08-13 | 山东大学 | Five-level photovoltaic inverter capable of reducing number of switching tubes and modulation method thereof |
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| CN108418455A (en) | 2018-08-17 |
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