CN108418455B - 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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- CN108418455B CN108418455B CN201810213600.4A CN201810213600A CN108418455B CN 108418455 B CN108418455 B CN 108418455B CN 201810213600 A CN201810213600 A CN 201810213600A CN 108418455 B CN108418455 B CN 108418455B
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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
Abstract
The present invention provides a kind of control method of multi-electrical level inverter, device and inverters, the DC bus-bar voltage that the control method passes through acquisition DC power supply, when DC bus-bar voltage is greater than the first preset voltage value, to third capacitor charging, make the second preset voltage value of voltage of third capacitor, and controls multi-electrical level inverter and be in default hybrid modulation mode.It can be seen that, this programme is when DC bus-bar voltage is greater than the first preset voltage value, to third capacitor charging, reduce the voltage carried in first switch branch and the 6th switching branches, therefore, compared with the prior art, the switching tube in first switch branch and the 6th switching branches reduces switching loss and conduction loss without selecting the biggish switching tube of voltage stress.Except this can be avoided capacitance voltage big ups and downs using hybrid modulation mode (hybrid modulations of three level and five level), the requirement of switch tube voltage stress in first switch branch and the 6th switching branches further reduced.
Description
This application claims on 04 26th, 2017 submission Patent Office of the People's Republic of China, application No. is 201710283092.2, invention
A kind of priority of the Chinese patent application of entitled " control method of multi-electrical level inverter, device and inverter " is complete
Portion's content is hereby incorporated by reference in the application.
Technical field
The present invention relates to Photovoltaic new energy technical field, in particular to a kind of control method of multi-electrical level inverter, device
And inverter.
Background technique
More 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 common multi-level inverter circuit, at least one electricity that suspends is arranged by some position in circuit
Hold, so that its level is clamped, forms different level output.
Common five level inverter circuit is as shown in Figure 1, include multiple switch pipe and freewheeling diode, wherein multiple
Switching tube according to preset logic carry out turn-on and turn-off, and then realize inversion function, output "+2Ud ", "+Ud ", " 0 ", "-
Ud " and " -2Ud " five kinds of level.Wherein, when output "+2Ud " level, switching tube Q1 and switching tube Q7 conducting switch at this time
The voltage at the both ends pipe Q6 be usually direct current power source voltage 2Ud 3/4 (for realize five level topology, the voltage of capacitor C3 can be tieed up
Hold in Ud/2 level), when direct current power source voltage is bigger, for example, 1500V will lead to the voltage at the both ends switching tube Q6 at this time
It is larger, such as 1125V can be reached.Inventors have found that since flying capacitor and bus capacitor can electricity in existing modulated process
Pressure fluctuation, and then cause the voltage at the both ends switching tube Q6 that may be more than 1200V.Therefore in order to guarantee that switching tube Q6 can be normal
Work, needs to choose the biggish switching tube of voltage stress.However, there are biggish switching losses for the biggish switching tube of voltage stress
And conduction loss, cause system effectiveness lower.Equally, when inverter output " -2Ud " level, the voltage at the both ends switching tube Q1
Also usually larger, it is also desirable to choose the biggish switching tube of voltage stress.
Therefore, how control method, device and the inverter of a kind of multi-electrical level inverter are provided, the consumption of switching tube is reduced
Damage and system effectiveness, are those skilled in the art's big technical problems urgently to be resolved.
Summary of the invention
The present invention provides control method, device and the inverter of a kind of multi-electrical level inverter, to solve in the prior art
Multi-electrical level inverter in switching tube consume is high and system effectiveness is low problem.
In order to achieve the object, technical solution provided by the present application 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 packet
It includes: first capacitor, the second capacitor, third capacitor and eight switching branches,
The first capacitor and the series arm of second capacitor are connected in parallel on the output plus terminal of DC power supply and output is born
Between end；
First switch branch is serially connected between the first end of the third capacitor and the output plus terminal of the DC power supply；
Second switch branch and third switching branches are serially connected in the second end and third electricity of the first capacitor
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and third electricity of second capacitor
Between the second end of appearance；
6th switching branches are serially connected between the second end of the third capacitor and the output negative terminal of the DC power supply；
7th switching branches are serially connected in the first end of the third capacitor and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the third capacitor and the output end of the multi-level inverter circuit
Between；
The control method, comprising:
Obtain the DC bus-bar voltage of the DC power supply；
When the DC bus-bar voltage is greater than the first preset voltage value, to the third capacitor charging, make the third
The voltage of capacitor is the second preset voltage value；
It controls the multi-electrical level inverter and is in default hybrid modulation mode, the default hybrid modulation mode includes three electricity
Flat operating mode and five level active modes；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the third capacitor is controlled
For third preset voltage value, second preset voltage value is greater than the third preset voltage value.
Preferably,
First preset voltage value is less than or equal to the rated output voltage of DC power supply in the multi-electrical level inverter；
The difference of second predeterminated voltage and the third predeterminated voltage is the first difference voltage, the first difference electricity
Pressure is greater than zero；
The third predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably,
The control multi-electrical level inverter is in default hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value, or, pre- less than the 5th
If when voltage value, controlling the multi-electrical level inverter and being in the three level actives mode；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th default electricity less than the 4th preset voltage value
Pressure value, or, being controlled at the multi-electrical level inverter when being greater than the 5th preset voltage value less than six preset voltage value
In the five level actives mode.
Preferably, the control multi-electrical level inverter is in the three level actives mode, comprising:
Multi-electrical level inverter the output "+2Ud ", " 0 " and " -2Ud " level are controlled,
When wherein inverter is not sent out idle, when output "+2Ud " level, the first switch branch and the described 7th
Switching branches conducting；
When exporting level "0", the 4th switching branches and the conducting of the 8th switching branches；
When output " -2Ud " level, the 6th switching branches and the 8th switching branches conducting.
Preferably, the control multi-electrical level inverter is in the five level actives mode, comprising:
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 output " 2Ud-Uc " level, the first switch branch and described
The conducting of eight switching branches；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
Optionally, the control multi-electrical level inverter is in default hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th preset voltage value less than the 4th default electricity
When pressure value, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value less than the 7th default electricity
Pressure, or, controlling the multi-electrical level inverter when being greater than eight predeterminated voltages less than the 5th preset voltage value and being in three level actives
Mode；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than seven predeterminated voltages, more level are controlled
Inverter is in 2 level modulations in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 5th default electricity less than the 6th preset voltage value
When pressure value, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
When the voltage of the modulating wave of multi-electrical level inverter output is less than eight predeterminated voltages, more level are controlled
Inverter is in -2 level modulations in five level active modes.
Optionally, the control multi-electrical level inverter is in default hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th preset voltage value less than the 4th default electricity
When pressure value, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value less than the 7th default electricity
When pressure, 2 level modulations that the multi-electrical level inverter is in five level active modes are controlled；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 7th predeterminated voltage, or, default less than the 8th
When voltage, controls the multi-electrical level inverter and be in three level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 5th default electricity less than the 6th preset voltage value
When pressure value, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 8th default electricity less than the 5th preset voltage value
When pressure, -2 level modulations that the multi-electrical level inverter is in five level active modes are controlled.
A kind of control device of multi-electrical level inverter is applied to multi-level inverter circuit, the multi-level inverter circuit packet
It includes: first capacitor, the second capacitor, third capacitor and eight switching branches,
The first capacitor and the series arm of second capacitor are connected in parallel on the output plus terminal of DC power supply and output is born
Between end；
First switch branch is serially connected between the first end of the third capacitor and the output plus terminal of the DC power supply；
Second switch branch and third switching branches are serially connected in the second end and third electricity of the first capacitor
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and third electricity of second capacitor
Between the second end of appearance；
6th switching branches are serially connected between the second end of the third capacitor and the output negative terminal of the DC power supply；
7th switching branches are serially connected in the first end of the third capacitor and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the third capacitor and the output end of the multi-level inverter circuit
Between；
The control device, comprising:
Module is obtained, for obtaining the DC bus-bar voltage of the DC power supply；
Control module is used for,
When the DC bus-bar voltage is greater than the first preset voltage value, charging to the third capacitor makes described the
The voltage of three capacitors is the second preset voltage value；
It controls the multi-electrical level inverter and is in default hybrid modulation mode, the default hybrid modulation mode includes three electricity
Flat operating mode and five level active modes；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the third capacitor is controlled
For third preset voltage value, second preset voltage value is greater than the third preset voltage value.
Preferably,
First preset voltage value is less than or equal to the rated output voltage of DC power supply in the multi-electrical level inverter；
The difference of second predeterminated voltage and the third predeterminated voltage is the first difference voltage, the first difference electricity
Pressure is greater than zero；
The third predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably, the control module includes:
First control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 4th predeterminated voltage
Value, or, controlling the multi-electrical level inverter when less than five preset voltage values and being in the three level actives mode；
Second control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 4th predeterminated voltage
Value is greater than the 6th preset voltage value, or, controlling institute when being greater than the 5th preset voltage value less than six preset voltage value
It states multi-electrical level inverter and is in the five level actives mode.
Preferably, the first control unit includes:
First control subelement, for controlling multi-electrical level inverter the output "+2Ud ", " 0 " and " -2Ud " level,
When wherein inverter is not sent out idle, when output "+2Ud " level, the first switch branch and the described 7th
Switching branches conducting；
When exporting level "0", the 4th switching branches and the conducting of the 8th switching branches；
When output " -2Ud " level, the 6th switching branches and the 8th switching branches conducting.
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 output " 2Ud-Uc " level, the first switch branch and described
The conducting of eight switching branches；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
Preferably, the control module further include:
Third control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 6th predeterminated voltage
When value is less than four preset voltage values, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
4th control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 4th predeterminated voltage
Value is less than the 7th predeterminated voltage, or, controlling the multi-level inverse conversion when being greater than eight predeterminated voltages less than the 5th preset voltage value
Device is in three level active modes；
5th control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 7th predeterminated voltage
When, control 2 level modulations that the multi-electrical level inverter is in five level active modes；
6th control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 6th predeterminated voltage
When value is greater than five preset voltage values, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
7th control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 8th predeterminated voltage
When, control -2 level modulations that the multi-electrical level inverter is in five level active modes.
Preferably, the control module further include:
8th control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 6th predeterminated voltage
When value is less than four preset voltage values, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
9th control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 4th predeterminated voltage
When value is less than seven predeterminated voltages, 2 level modulations that the multi-electrical level inverter is in five level active modes are controlled；
Tenth control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 7th default electricity
Pressure, or, controlling the multi-electrical level inverter when less than eight predeterminated voltages and being in three level active modes；
11st control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 6th default electricity
When pressure value is greater than five preset voltage values, -1 level tune that the multi-electrical level inverter is in five level active modes is controlled
System；
12nd control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 5th default electricity
When pressure value is greater than eight predeterminated voltages, -2 level modulations that the multi-electrical level inverter is in five level active modes are controlled.
A kind of inverter, including the above-mentioned control device of any one.
The present invention provides a kind of control method of multi-electrical level inverter, device and inverter, which passes through
Obtain the DC bus-bar voltage of the DC power supply；When the DC bus-bar voltage is greater than the first preset voltage value, to described
The charging of third capacitor, makes the second preset voltage value of voltage of the third capacitor, and controls at the multi-electrical level inverter
In default hybrid modulation mode.As it can be seen that this programme fills third capacitor when DC bus-bar voltage is greater than the first preset voltage value
Electricity, so that the voltage carried on first switch branch and the 6th switching branches reduces, therefore, compared with the prior art,
Switching tube in first switch branch and the 6th switching branches reduces switch without selecting the biggish switching tube of voltage stress
Loss and conduction loss, and then improve system effectiveness.Except this, in the present solution, using hybrid modulation mode (three level and five electricity
Flat hybrid modulation), it can be avoided the larger fluctuation of capacitor, further reduced first switch branch 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, described in control
The voltage of third capacitor is third preset voltage value, wherein second preset voltage value is greater than the third preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, control third capacitor is conventional value (1/4 DC bus-bar voltage), to guarantee that more level are inverse
Become the normal modulation of device.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
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 structural schematic diagram for the five-electrical level inverter that the prior art provides；
Fig. 2 is the structural schematic diagram for the another five-electrical level inverter that the prior art provides；
Fig. 3 is a kind of flow diagram of control method provided in this embodiment；
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 schematic diagram of another five-electrical level inverter provided in an embodiment of the present invention；
Fig. 9 is the schematic diagram of the hybrid modulation of inverter in the embodiment of the present invention；
Figure 10 is the another schematic diagram of the hybrid modulation of inverter in the embodiment of the present invention；
Figure 11 and 12 be another embodiment of the present invention provides five-electrical level inverter application schematic diagram；
Figure 13 a and 13b be another embodiment of the present invention provides two-phase five-electrical level inverter application schematic diagram；
Figure 14 a and 14b be another embodiment of the present invention provides three-phase three-wire system five-electrical level inverter application schematic diagram；
Figure 15 a and 15b be another embodiment of the present invention provides three-phase four-wire system five-electrical level inverter application 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 control method, device and the inverter of a kind of multi-electrical level inverter, to solve in the prior art
The problem that switching tube consume is high in multi-electrical level inverter and system effectiveness is low.
Specifically, the control method is applied to multi-level inverter circuit, as shown in Fig. 2, the multi-level inverter circuit packet
It includes: first capacitor C1, the second capacitor C2, third capacitor C3 and eight switching branches (10-80).
Specifically, the series arm of the first capacitor C1 and the second capacitor C2 is being connected in parallel on the output of DC power supply just
It holds between PV+ (end A) and output negative terminal PV- (end B).
First switch branch 10 is serially connected in the first end P of the third capacitor C3 and the output plus terminal of the DC power supply
Between PV+.
Second switch branch 20 and third switching branches 30 are serially connected in the second end N of the first capacitor C1 and described
Between the first end P of third capacitor C3.
4th switching branches 40 and the 5th switching branches 50 are serially connected in the first end N of the second capacitor C2 and described
Between the second end N of third capacitor C3.
6th switching branches 60 are serially connected in the second end N of the third capacitor C3 and the output negative terminal of the DC power supply
Between PV-.
7th switching branches 70 be serially connected in the third capacitor C3 first end P and five level inverter circuit it is defeated
Between outlet R.
8th switching branches 80 be serially connected in the third capacitor C3 second end N and five level inverter circuit it is defeated
Between outlet R.
As stated in the background art, inventor answers to reduce switch tube in first switch branch and the 6th switching branches
The requirement of power proposes a kind of control method in conjunction with Fig. 1, as shown in Fig. 2, comprising steps of
S1, the DC bus-bar voltage Vpv for obtaining the DC power supply.
S11, when the DC bus-bar voltage Vpv be greater than the first preset voltage value V1 when, to the third capacitor C3 charge,
Voltage the second preset voltage value V2 for making the third capacitor C3 controls the multi-electrical level inverter and is in default hybrid modulation
Mode (hybrid modulations of three level and five level).
S12, when the DC bus-bar voltage Vpv be less than or equal to the first preset voltage value V1 when, control the third
The voltage of capacitor C3 is third preset voltage value V3, and the second preset voltage value V2 is greater than the third preset voltage value V3.
Wherein, the first preset voltage value V1 is less than or equal to the rated output of DC power supply in the multi-electrical level inverter
Voltage can be preset voltage value Vset.Such as when the rated output voltage of DC power supply is 1500V, then V1 is that may be configured as
1300V is perhaps lower so that the voltage at the perhaps both ends NB AP is lower consequently facilitating switching tube type selecting or reducing switching tube
Pressure drop.The difference of the second predeterminated voltage V2 and the third predeterminated voltage V3 are the first difference voltage Voffset, described the
One difference voltage Voffset is greater than zero, and value can fix or according to the carry out dynamic adjustment such as PV voltage, such as can choose
100V perhaps Vpv/8 or changes according to PV voltage and V1 voltage difference.Third predeterminated voltage V3 is described straight in this programme
Flow a quarter of busbar voltage, i.e. V3=Vpv/4, then correspondingly, the second predeterminated voltage V2 can be Vpv/4+Voffset.
As it can be seen that this programme DC bus-bar voltage be greater than the first preset voltage value when, to third capacitor charging, so that
The voltage carried on first switch branch and the 6th switching branches reduces, therefore, compared with the prior art, first switch branch
And the 6th switching tube in switching branches reduces switching loss and conducting damage without selecting the biggish switching tube of voltage stress
Consumption, and then improve system effectiveness.Except this, in the present solution, using three level active modes and five level active modes, it can
Capacitance voltage big ups and downs are avoided, switch tube voltage in first switch branch and the 6th switching branches is further reduced and answers
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, described in control
The voltage of third capacitor is third preset voltage value, wherein second preset voltage value is greater than the third preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, control third capacitor is conventional value (1/4 DC bus-bar voltage), to guarantee that more level are inverse
Become the normal modulation of device.
Inventors have found that normal five level modulation is as shown in figure 4, in high voltage startup, the charging of suspended voltage imbalance is led
Cause suspended voltage fluctuation at this time big.Therefore, on the basis of the above embodiments, it is described more to additionally provide a kind of control for the present embodiment
Electrical level inverter is in the specific working mode of hybrid modulation mode, as shown in Figure 5, comprising:
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 4th preset voltage value Vt1, or, less than the
When five preset voltage value Vt2, controls the multi-electrical level inverter and be in three level active modes.
It is preset when the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th less than the 4th preset voltage value Vt1
Voltage value 0, or, controlling more level when being greater than the 5th preset voltage value Vt2 less than six preset voltage value 0
Inverter is in five level active modes.
Specifically, in conjunction with Fig. 6, three level active modes, are as follows: control the multi-electrical level inverter output "+2Ud ", " 0 " with
And " -2Ud " level.
When inverter is not sent out idle:
When exporting "+2Ud " level, the arrow direction 1. indicated along figure, the first switch branch and the described 7th
Switching branches conducting；
When exporting level "0", the arrow direction 2. indicated along figure, the 4th switching branches and the 8th switch are propped up
Road conducting；
When output " -2Ud " level, the arrow direction 3. indicated along figure, the 6th switching branches and described
The conducting of eight switching branches.
Specifically, five level active modes, as shown in fig. 7, are as follows: control multi-electrical level inverter output " Uc ", " 2Ud-
Uc ", "-Uc " and "-(2Ud-Uc) " level.
When wherein inverter is not sent out idle:
When output " 2Ud-Uc " level, the arrow direction 4. indicated along figure, the first switch branch and described
The conducting of 8th switching branches；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
It should be noted that being by taking Fig. 1 as an example in above-described embodiment, wherein switching branches be a switching tube simultaneously
Join the structure of a diode, however, the control method that this programme provides, applies also for the multi-electrical level inverter of other structures,
As shown in figure 8, third switching branches and the 4th switching branches are continued flow switch pipe in the multi-level inverter circuit, other switches
Branch is non-continued flow switch pipe.Its working principle refers to above-described embodiment, and this will not be detailed here.
On the basis of the above embodiments, inventors have found that either controlling the multi-electrical level inverter is in three level
Operating mode or five level active modes, when level is when 0 to+2Ud or 0 to -2Ud jumps, reactance pressure at this time is excessive,
It is serious to will lead to switching tube fever.
Based on this, in conjunction with Fig. 9, the control method of multi-electrical level inverter provided in this embodiment is controlling more level
It, can be with when inverter is in default hybrid modulation mode specifically:
It is preset when the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 6th preset voltage value 0 less than the 4th
When voltage value Vt1,1 level modulation that the multi-electrical level inverter is in five level active modes is controlled, so that modulation result
From 0 level of output to exporting 1 level；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 4th preset voltage value Vt1 in advance less than the 7th
If when voltage Vt3, controlling the multi-electrical level inverter and being in three level active modes, so that modulation result is from 0 level to 2 level
Jump；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 7th predeterminated voltage Vt3, described in control
Multi-electrical level inverter is in 2 level modulations in five level active modes, so that modulation result is from 1-2；
It is preset when the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 5th less than the 6th preset voltage value 0
When voltage value Vt2, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled, so that modulation result
From 0 level of output to -1 level of output；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 8th in advance less than the 5th preset voltage value Vt2
If when voltage Vt4, controlling the multi-electrical level inverter and being in three level active modes so that modulation result from output 0 level to
Export -2 level；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is less than the 8th predeterminated voltage Vt4, described in control
Multi-electrical level inverter is in -2 level modulations in five level active modes, so that modulation result is from -1 level of output to output -2
Level.
Wherein, the 4th preset voltage value Vt1, the 5th preset voltage value Vt2, the 7th preset voltage value Vt3 and the 8th are pre-
If voltage value Vt4 can be set according to actual needs, value is variable.Using the regulation method of above-described embodiment, can reduce
Reactance meets with stresses, further protective switch pipe.
Except this, in conjunction with Figure 10, the control method of multi-electrical level inverter provided in this embodiment, controlling, more level are inverse
It, can be with when becoming device and being in default hybrid modulation mode specifically:
It is preset when the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 6th preset voltage value 0 less than the 4th
When voltage value Vt1,1 level modulation that the multi-electrical level inverter is in five level active modes is controlled, so that modulation result
From 0 level of output to exporting 1 level；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 4th preset voltage value Vt1 in advance less than the 7th
If when voltage Vt3,2 level modulations that the multi-electrical level inverter is in five level active modes are controlled, so that modulation result
From 1 level of output to exporting 2 level；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 7th predeterminated voltage Vt3, described in control
Multi-electrical level inverter is in three level active modes, so that modulation result is from 0 level of output to exporting 2 level；
It is preset when the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 5th less than the 6th preset voltage value 0
When voltage value Vt2, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled, so that modulation result
From 0 level of output to -1 level of output；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is greater than the 8th in advance less than the 5th preset voltage value Vt2
If when voltage Vt4, -2 level modulations that the multi-electrical level inverter is in five level active modes are controlled, so that modulation result
From -1 level of output to -2 level of output；
When the voltage of the modulating wave Vm of multi-electrical level inverter output is less than the 8th predeterminated voltage Vt4, described in control
Multi-electrical level inverter is in three level active modes, so that modulation result is from 0 level of output to -2 level of output.
Equally, using the regulation method of above-described embodiment, meeting with stresses for reactance, further protective switch can be reduced
Pipe.
Specifically, three level active modes, as shown in fig. 6, when inverter is not sent out idle:
When exporting "+2 " level, the arrow direction 1. indicated along figure and the described 7th is opened the first switch branch
Close branch conducting；
When exporting level "0", the arrow direction 2. indicated along figure, the 4th switching branches and the 8th switch are propped up
Road conducting；
When output " -2 " level, the arrow direction 3. indicated along figure, the 6th switching branches and the described 8th
Switching branches conducting.
Specifically, five level active modes, as shown in fig. 7, are as follows: control the multi-electrical level inverter output " 1 ", " -1 " electricity
It is flat.
When wherein inverter is not sent out idle:
When exporting level"1", the arrow direction 4. indicated along figure and the described 8th is opened the first switch branch
Close branch conducting, voltage 2Ud-Uc；
When exporting level"1", the 5th switching branches and the 7th switching branches conducting, voltage Uc；
When output " -1 " level, the third switching branches and the 8th switching branches conducting, voltage is-Uc；
When output " -1 " level, the 6th switching branches and the 7th switching branches conducting, voltage be -
(2Ud-Uc)。
On the basis of the above embodiments, 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: that first capacitor, the second capacitor, third capacitor and eight open
Branch is closed,
The first capacitor and the series arm of second capacitor are connected in parallel on the output plus terminal of DC power supply and output is born
Between end；
First switch branch is serially connected between the first end of the third capacitor and the output plus terminal of the DC power supply；
Second switch branch and third switching branches are serially connected in the second end and third electricity of the first capacitor
Between the first end of appearance；
4th switching branches and the 5th switching branches are serially connected in the first end and third electricity of second capacitor
Between the second end of appearance；
6th switching branches are serially connected between the second end of the third capacitor and the output negative terminal of the DC power supply；
7th switching branches are serially connected in the first end of the third capacitor and the output end of the multi-level inverter circuit
Between；
8th switching branches are serially connected in the second end of the third capacitor and the output end of the multi-level inverter circuit
Between；
The control device, comprising:
Module is obtained, for obtaining the DC bus-bar voltage of the DC power supply；
Control module is used for,
When the DC bus-bar voltage is greater than the first preset voltage value, charging to the third capacitor makes described the
The voltage of three capacitors is the second preset voltage value；
It controls the multi-electrical level inverter and is in default hybrid modulation mode；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage of the third capacitor is controlled
For third preset voltage value, second preset voltage value is greater than the third preset voltage value.
Preferably,
First preset voltage value is less than or equal to the rated output voltage of DC power supply in the multi-electrical level inverter；
The difference of second predeterminated voltage and the third predeterminated voltage is the first difference voltage, the first difference electricity
Pressure is greater than zero；
The third predeterminated voltage is a quarter of the DC bus-bar voltage.
Preferably, the control module includes:
First control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than third predeterminated voltage
Value, or, controlling the multi-electrical level inverter when less than four preset voltage values and being in three level active modes；
Second control unit, the voltage for the modulating wave when multi-electrical level inverter output are less than third predeterminated voltage
Value is greater than the 5th preset voltage value, or, controlling institute when being greater than the 4th preset voltage value less than five preset voltage value
It states multi-electrical level inverter and is in five level active modes.
Preferably, the first control unit includes:
First control subelement, for controlling multi-electrical level inverter the output "+2Ud ", " 0 " and " -2Ud " level,
Wherein inverter is not sent out idle constantly:
When output "+2Ud " level, the first switch branch and the 7th switching branches conducting；
When exporting level "0", the 4th switching branches and the conducting of the 8th switching branches；
When output " -2Ud " level, the 6th switching branches and the 8th switching branches conducting.
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 output " 2Ud-Uc " level, the first switch branch and the 8th switching branches conducting；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
The working principle of the control device refers to above method embodiment, and this will not be detailed here.
On the basis of the above embodiments, 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 figure 11, the second input terminal and output end of the five-electrical level inverter are also
It can be connected respectively by elements (such as capacitor) such as inductance with power grid.The front end of the five-electrical level inverter can also increase by one
A DC/DC converter carries out the variation of voltage, for widening the input voltage range of the five-electrical level inverter.Alternatively, such as
Shown in Figure 12, the front end of the five-electrical level inverter increases a DC/DC converter also to carry out the variation of voltage, and its second
Input terminal and output end pass through the elements such as inductance (such as capacitor) respectively and are connected with power grid.
Another embodiment of the present invention additionally provides a kind of application circuit of five-electrical level inverter, is this reality as depicted in fig. 13 a
The two-phase five-electrical level inverter topological diagram of example offer, the five-electrical level inverter including two as described in above-described embodiment, difference are provided
For the first five-electrical level inverter 101 and the second five-electrical level inverter 102；Wherein:
The first input end of 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 terminal of the first five-electrical level inverter 101 and the second five-electrical level inverter 102 with first capacitor C1 and
The tie point of second capacitor C2 is connected；
The third input terminal of 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 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；
The phase phase difference 180 degree of the primary sinusoid and the second sine wave or 0 degree.
Another embodiment of the present invention additionally provides a kind of application circuit of five-electrical level inverter, is this reality as shown in figures 14a
The three-phase three-wire system five-electrical level inverter topological diagram that example offer is provided, including five level inverse conversions described in three embodiments as discussed above
Device, respectively the first five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203；Wherein:
First five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 it is first defeated
Enter the anode that end is all connected with the DC power supply PV；
First five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 it is second defeated
Enter end to be connected with the tie point of first capacitor C1 and the second capacitor C2；
The third of first five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 is defeated
Enter the negative terminal that end is all connected with the DC power supply；
The output end of first five-electrical level inverter 201, the second five-electrical level inverter 202 and third 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 third five-electrical level inverter 203 is modulated by third sine wave；
The phase of the primary sinusoid, the second sine wave and third sine wave successively 120 degree of mutual deviation.
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. 15 a
The three-phase four-wire system five-electrical level inverter topological diagram of example offer, five level inverse conversions including three as described in above-described embodiment are provided
Device, respectively the first five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203；Wherein:
First five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 it is first defeated
Enter the anode that end is all connected with the DC power supply PV；
First five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 it is second defeated
Enter end to be connected with the tie point of first capacitor C1 and the second capacitor C2；
The third of first five-electrical level inverter 201, the second five-electrical level inverter 202 and third five-electrical level inverter 203 is defeated
Enter the negative terminal that end is all connected with the DC power supply；
The output end of first five-electrical level inverter 201, the second five-electrical level inverter 202 and third 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 first capacitor C1 and the second capacitor C2 as the five-electrical level inverter application circuit it is the 4th defeated
Outlet is connected with three ac output ends with elements (such as further including capacitor) such as inductance by power grid 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 third five-electrical level inverter 203 is modulated by third sine wave；
The phase of the primary sinusoid, the second sine wave and third sine wave successively 120 degree of mutual deviation.
In specific practical application, the front end of the application circuit of the five-electrical level inverter can also increase a DC/
DC converter carries out the variation of voltage, the input voltage range of the application circuit for widening the five-electrical level inverter.Institute
The each ac output end for stating the application circuit of five-electrical level inverter can also (such as further include respectively electricity by the elements such as inductance
Hold) it is connected with power grid.Or as shown in Figure 13 b, 14b and 15b, the application circuit of each five-electrical level inverter, front end
Increase a DC/DC converter to carry out the variation of voltage, and its each ac output end also respectively by the elements such as inductance with
Power grid is connected.
The application circuit of each five-electrical level inverter described in above-described embodiment, can be applied to photovoltaic generating system, phase
It answers, the DC power supply is photovoltaic cell component.Or the application circuit of each five-electrical level inverter also can 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 of the five-electrical level inverter
Equally has the advantages that this.
To sum up, the present invention provides a kind of control method of multi-electrical level inverter, device and inverter, the control methods
By the DC bus-bar voltage for obtaining the DC power supply；It is right when the DC bus-bar voltage is greater than the first preset voltage value
The third capacitor charging, makes the second preset voltage value of voltage of the third capacitor, and controls the multi-electrical level inverter
In three level active modes and five level active modes.As it can be seen that this programme is greater than the first predeterminated voltage in DC bus-bar voltage
When value, to third capacitor charging, so that the voltage carried on first switch branch and the 6th switching branches reduces, because
This, compared with the prior art, the switching tube in first switch branch and the 6th switching branches is without selecting voltage stress larger
Switching tube, reduce switching loss and conduction loss, and then improve system effectiveness.Except this, in the present solution, using three level
Operating mode and five level active modes, can be avoided capacitance voltage big ups and downs, further reduced first switch branch
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, described in control
The voltage of third capacitor is third preset voltage value, wherein second preset voltage value is greater than the third preset voltage value.
I.e. when DC bus-bar voltage does not transfinite, control third capacitor is conventional value (1/4 DC bus-bar voltage), to guarantee that more level are inverse
Become the normal modulation of device.
However above-described embodiment, it is only presently preferred embodiments of the present invention, not the present invention is made in any form
Limitation.Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with this field
Technical staff, without departing from the scope of the technical proposal of the invention, all using the methods and technical content pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
It is made to the above embodiment according to the technical essence of the invention any simply to repair without departing from the content of technical solution of the present invention
Change, equivalent variations and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (13)
1. a kind of control method of multi-electrical level inverter is applied to multi-level inverter circuit, which is characterized in that more level are inverse
Power transformation road includes: first capacitor, the second capacitor, third capacitor and eight switching branches,
The series arm of the first capacitor and second capacitor be connected in parallel on DC power supply output plus terminal and output negative terminal it
Between；
First switch branch is serially connected between the first end of the third capacitor and the output plus terminal of the DC power supply；
Second switch branch and third switching branches be serially connected in the first capacitor second end and the third capacitor
Between first end；
4th switching branches and the 5th switching branches be serially connected in second capacitor first end and the third capacitor
Between second end；
6th switching branches are serially connected between the second end of the third capacitor and the output negative terminal of the DC power supply；
7th switching branches are serially connected between the first end of the third capacitor and the output end of the multi-level inverter circuit；
8th switching branches are serially connected between the second end of the third capacitor and the output end of the multi-level inverter circuit；
The control method includes:
Obtain the DC bus-bar voltage of the DC power supply；
When the DC bus-bar voltage is greater than the first preset voltage value, to the third capacitor charging, make the third capacitor
Voltage be the second preset voltage value；
It controls the multi-electrical level inverter and is in default hybrid modulation mode, the default hybrid modulation mode includes three level works
Operation mode and five level active modes；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage for controlling the third capacitor is the
Three preset voltage values, second preset voltage value are greater than the third preset voltage value；
The control multi-electrical level inverter is in default hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value, or, less than the 5th default electricity
When pressure value, controls the multi-electrical level inverter and be in the three level actives mode；
When the multi-electrical level inverter output modulating wave voltage less than the 4th preset voltage value be greater than the 6th preset voltage value,
Or, controlling the multi-electrical level inverter when being greater than the 5th preset voltage value less than six preset voltage value and being in institute
State five level active modes.
2. control method according to claim 1, which is characterized in that
First preset voltage value is less than or equal to the rated output voltage of DC power supply in the multi-electrical level inverter；
The difference of second predeterminated voltage and the third predeterminated voltage is the first difference voltage, and first difference voltage is big
In zero；
The third predeterminated voltage is a quarter of the DC bus-bar voltage.
3. control method according to claim 1, which is characterized in that the control multi-electrical level inverter is in described
Three level active modes, comprising:
Multi-electrical level inverter the output "+2Ud ", " 0 " and " -2Ud " level are controlled,
When wherein inverter is not sent out idle, when output "+2Ud " level, the first switch branch and the 7th switch
Branch conducting；
When exporting level "0", the 4th switching branches and the conducting of the 8th switching branches；
When output " -2Ud " level, the 6th switching branches and the 8th switching branches conducting.
4. control method according to claim 1, which is characterized in that the control multi-electrical level inverter is in described
Five level active modes, comprising:
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 output " 2Ud-Uc " level, the first switch branch and the described 8th open
Close branch conducting；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
5. control method according to claim 1, which is characterized in that the control multi-electrical level inverter is in default
Hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th preset voltage value less than the 4th preset voltage value
When, control 1 level modulation that the multi-electrical level inverter is in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value less than the 7th predeterminated voltage,
Or, controlling the multi-electrical level inverter when being greater than eight predeterminated voltages less than the 5th preset voltage value and being in three level active moulds
Formula；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than seven predeterminated voltages, the multi-level inverse conversion is controlled
Device is in 2 level modulations in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 5th preset voltage value less than the 6th preset voltage value
When, control -1 level modulation that the multi-electrical level inverter is in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is less than eight predeterminated voltages, the multi-level inverse conversion is controlled
Device is in -2 level modulations in five level active modes.
6. control method according to claim 1, which is characterized in that the control multi-electrical level inverter is in default
Hybrid modulation mode, comprising:
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 6th preset voltage value less than the 4th preset voltage value
When, control 1 level modulation that the multi-electrical level inverter is in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 4th preset voltage value less than seven predeterminated voltages,
Control 2 level modulations that the multi-electrical level inverter is in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 7th predeterminated voltage, or, less than the 8th predeterminated voltage
When, it controls the multi-electrical level inverter and is in three level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than the 5th preset voltage value less than the 6th preset voltage value
When, control -1 level modulation that the multi-electrical level inverter is in five level active modes；
When the voltage of the modulating wave of multi-electrical level inverter output is greater than eight predeterminated voltages less than the 5th preset voltage value,
Control -2 level modulations that the multi-electrical level inverter is in five level active modes.
7. a kind of control device of multi-electrical level inverter is applied to multi-level inverter circuit, which is characterized in that more level are inverse
Power transformation road includes: first capacitor, the second capacitor, third capacitor and eight switching branches,
The series arm of the first capacitor and second capacitor be connected in parallel on DC power supply output plus terminal and output negative terminal it
Between；
First switch branch is serially connected between the first end of the third capacitor and the output plus terminal of the DC power supply；
Second switch branch and third switching branches be serially connected in the first capacitor second end and the third capacitor
Between first end；
4th switching branches and the 5th switching branches be serially connected in second capacitor first end and the third capacitor
Between second end；
6th switching branches are serially connected between the second end of the third capacitor and the output negative terminal of the DC power supply；
7th switching branches are serially connected between the first end of the third capacitor and the output end of the multi-level inverter circuit；
8th switching branches are serially connected between the second end of the third capacitor and the output end of the multi-level inverter circuit；
The control device includes:
Module is obtained, for obtaining the DC bus-bar voltage of the DC power supply；
Control module is used for,
When the DC bus-bar voltage is greater than the first preset voltage value, charging to the third capacitor makes the third electricity
The voltage of appearance is the second preset voltage value；
It controls the multi-electrical level inverter and is in default hybrid modulation mode, the default hybrid modulation mode includes three level works
Operation mode and five level active modes；
When the DC bus-bar voltage is less than or equal to first preset voltage value, the voltage for controlling the third capacitor is the
Three preset voltage values, second preset voltage value are greater than the third preset voltage value；
The control module includes:
First control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 4th preset voltage value,
Or, controlling the multi-electrical level inverter when less than five preset voltage values and being in the three level actives mode；
Second control unit, the voltage for the modulating wave when multi-electrical level inverter output are big less than the 4th preset voltage value
In the 6th preset voltage value, or, being controlled described more when being greater than the 5th preset voltage value less than six preset voltage value
Electrical level inverter is in the five level actives mode.
8. control device according to claim 7, which is characterized in that
First preset voltage value is less than or equal to the rated output voltage of DC power supply in the multi-electrical level inverter；
The difference of second predeterminated voltage and the third predeterminated voltage is the first difference voltage, and first difference voltage is big
In zero；
The third predeterminated voltage is a quarter of the DC bus-bar voltage.
9. control device according to claim 7, which is characterized in that the first control unit includes:
First control subelement, for controlling multi-electrical level inverter the output "+2Ud ", " 0 " and " -2Ud " level,
When wherein inverter is not sent out idle, when output "+2Ud " level, the first switch branch and the 7th switch
Branch conducting；
When exporting level "0", the 4th switching branches and the conducting of the 8th switching branches；
When output " -2Ud " level, the 6th switching branches and the 8th switching branches conducting.
10. control device according to claim 7, which is characterized 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 output " 2Ud-Uc " level, the first switch branch and the described 8th open
Close branch conducting；
When output " Uc " level, the 5th switching branches and the 7th switching branches conducting；
When output "-Uc " level, the third switching branches and the 8th switching branches conducting；
When output "-(2Ud-Uc) " level, the 6th switching branches and the 7th switching branches conducting.
11. control device according to claim 7, which is characterized in that the control module further include:
Third control unit, it is small that the voltage for the modulating wave when multi-electrical level inverter output is greater than the 6th preset voltage value
When four preset voltage values, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
4th control unit, it is small that the voltage for the modulating wave when multi-electrical level inverter output is greater than the 4th preset voltage value
In the 7th predeterminated voltage, or, being controlled at the multi-electrical level inverter when being greater than eight predeterminated voltages less than the 5th preset voltage value
In three level active modes；
5th control unit, when the voltage of the modulating wave for exporting when the multi-electrical level inverter is greater than seven predeterminated voltages,
Control 2 level modulations that the multi-electrical level inverter is in five level active modes；
6th control unit, the voltage for the modulating wave when multi-electrical level inverter output are big less than the 6th preset voltage value
When five preset voltage values, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
7th control unit, when the voltage of the modulating wave for exporting when the multi-electrical level inverter is less than eight predeterminated voltages,
Control -2 level modulations that the multi-electrical level inverter is in five level active modes.
12. control device according to claim 7, which is characterized in that the control module further include:
8th control unit, it is small that the voltage for the modulating wave when multi-electrical level inverter output is greater than the 6th preset voltage value
When four preset voltage values, 1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
9th control unit, it is small that the voltage for the modulating wave when multi-electrical level inverter output is greater than the 4th preset voltage value
When seven predeterminated voltages, 2 level modulations that the multi-electrical level inverter is in five level active modes are controlled；
Tenth control unit, the voltage for the modulating wave when multi-electrical level inverter output are greater than the 7th predeterminated voltage, or,
When less than eight predeterminated voltages, controls the multi-electrical level inverter and be in three level active modes；
11st control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 6th preset voltage value
When greater than five preset voltage values, -1 level modulation that the multi-electrical level inverter is in five level active modes is controlled；
12nd control unit, the voltage for the modulating wave when multi-electrical level inverter output is less than the 5th preset voltage value
When greater than eight predeterminated voltages, -2 level modulations that the multi-electrical level inverter is in five level active modes are controlled.
13. a kind of inverter, which is characterized in that including the control device as described in any one of claim 7-12.
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| CN106169884A (en) * | 2016-06-30 | 2016-11-30 | 阳光电源股份有限公司 | The precharge control method of five-level active neutral-point-clamped type inverter and device |
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| CN104467499A (en) * | 2015-01-04 | 2015-03-25 | 阳光电源股份有限公司 | Five-level inverter neutral-point balancing control method and system |
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