CN104753377B - A kind of multi-electrical level inverter based on bridge-type modular switch electric capacity - Google Patents
A kind of multi-electrical level inverter based on bridge-type modular switch electric capacity Download PDFInfo
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- CN104753377B CN104753377B CN201510192526.9A CN201510192526A CN104753377B CN 104753377 B CN104753377 B CN 104753377B CN 201510192526 A CN201510192526 A CN 201510192526A CN 104753377 B CN104753377 B CN 104753377B
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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
Abstract
The invention provides a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity, bridge type modular multi-level switching capacity module and inversion module two parts are included；In system operation, output voltage U is first realized by bridge type modular multi-level switching capacity module DC DC conversioni→2Ui→4Ui→2Ui→UiConversion process, then via inversion module realize DC AC convert.The invention provides a kind of multi-electrical level inverter based on novel bridge type modular switch electric capacity, realize high efficiency, high power density and high-voltage variable the ratio operation of DC DC transform parts, the innovation of DC AC transform parts is optimized to unipolarity frequency multiplication SPWM modes, while relatively conventional multi-level inverse conversion module effectively reduces switching tube quantity, high-quality output waveform and low harmonic content are realized.
Description
Technical field
The present invention relates to a kind of multi-electrical level inverter based on novel bridge type modular switch electric capacity.
Background technology
The energy is the important substance basis of human society survival and development.In recent years, the finiteness of world's fossil energy and
Problem of environmental pollution caused by during exploitation becomes increasingly conspicuous, and has become the main of restriction World Economics sustainable development
Bottleneck, the exploitation of the regenerative resource of cleaning are paid much attention to by countries in the world.Parallel network power generation is used as solar energy
It is main to utilize one of form, paid attention in again by people.
Increasingly mature with technology, the poor reliability that exists for traditional centralized photovoltaic parallel in system, efficiency is low, can
The problems such as autgmentability is poor, there has been proposed the concept of Miniature inverter, electric energy conversion is individually carried out to every piece of battery, is effectively solved
The integrity problem of centralized grid-connected system, for realize high-quality, efficiently, grid-connecting apparatus stably, cheap indicate new side
To.
Inverter decides whole photovoltaic generating system as photovoltaic array and the capital equipment of grid interface, its performance
Performance.For the electric energy feed-in power network, and improve the stability of its operation, reliability to greatest extent for producing photovoltaic array
And accuracy, it is necessary to main circuit topology selection, filter parameter design and its control strategy selection of combining inverter etc. are entered
Row further investigation.
Inverter structure common at present can be divided into single stage type conversion and multi-stag conversion two according to the series of power conversion
Control method per one-level of kind of topological project, wherein DC-DC-AC two-stage types topological Simplification so that can be absorbed in per one-level
The quality and efficiency of each automatic control method.The DC voltage conversion link of conventional inverter is mainly boost circuits, distributed electrical
The VD in source is followed by DC-AC transform parts by pump liter, to meet grid-connected conditions.However, due to Boost circuit
Voltage lifting it is limited in one's ability, the receptive distributed power source DC voltage change scope of combining inverter institute is typically narrow,
Meanwhile, the perceptual transducer effciency of traditional boost types is not general high.In addition common monolithic photovoltaic battery panel output voltage at present
Mostly 20-50V, and China's line voltage peak value is 311V.DC converting link voltage no-load voltage ratio thus how is improved, is realized efficient
Rate, the DC-DC conversion of low cost have caused the extensive concern of people.
At the same time, the performance of photovoltaic parallel in system can be also efficiently modified using advanced control technology.Power electronics device
The appearance of the raising, particularly high-performance digital signal processor (DSP) of the high frequency and microprocessor arithmetic speed of part, is one
The application of a little advanced control strategies provides condition.Conventional sinusoidal pulse width modulation (SPWM) mode is broadly divided into unipolarity tune
System, bipolar modulation and unipolarity multiple-frequency modulation mode.Compared with bipolar modulation, unipolarity modulation possess harmonic component it is small,
It is easy to elimination, the harmonic wave interference reduction to external equipment, the advantages of switch stress is small.And the frequency multiplication phenomenon of unipolarity modulation can make
The umber of pulse of inverter output voltage extraordinarily, also beneficial to reducing system harmonicses and to outside interference.
The content of the invention
Technical problem underlying to be solved by this invention is to provide a kind of based on many of novel bridge type modular switch electric capacity
Electrical level inverter, realizes high efficiency, high power density and the high-voltage variable ratio of DC-DC transform parts, DC-AC changing ring economise-creates
Newly unipolarity frequency multiplication SPWM modes are optimized, switching tube quantity is effectively reduced in relatively conventional multi-level inverse conversion module
Meanwhile, realize high-quality output waveform and low harmonic content.
In order to solve above-mentioned technical problem, the invention provides a kind of many level based on bridge-type modular switch electric capacity
Inverter, includes bridge type modular multi-level switching capacity module and inversion module two parts；In system operation, first by bridge
Output voltage U is realized in formula modular multilevel switching capacity module DC-DC conversioni→2Ui→4Ui→2Ui→UiConversion process,
Then realize that DC-AC is converted via inversion module.
In a preferred embodiment：The bridge type modular multi-level switching capacity module includes H bridges and basic switch electricity
Molar block；Wherein H bridges are made up of four full-controlled device switch mosfet pipes, respectively the first HF switch S1, the second high frequency opens
Close S2, the 3rd HF switch S3, the 4th HF switch S4；Basic switch capacitance module includes the first capacitance network and the second electric capacity
Network, and four full-controlled device switch mosfet pipes, respectively the 5th HF switch S1a, the 6th HF switch S1b, it is the 7th high
Frequency switch S2a, the 8th HF switch S2b。
In a preferred embodiment：As the 5th HF switch S1a, the 6th HF switch S1b, the 7th HF switch S2a、
8th HF switch S2bClosure, the first HF switch S1, the second HF switch S2, the 3rd HF switch S3, the 4th HF switch S4
During disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=Ui。
In a preferred embodiment：As the first HF switch S1, the 3rd HF switch S3, the 6th HF switch S1b、
8th HF switch S2bClosure, the second HF switch S2, the 4th HF switch S4, the 5th HF switch S1a, the 7th HF switch
S2aDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=2Ui；As the second HF switch S2, it is the 4th high
Frequency switch S4, the 5th HF switch S1a, the 7th HF switch S2aClosure, the first HF switch S1, the 3rd HF switch S3, the 6th
HF switch S1b, the 8th HF switch S2bDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=
2Ui；And above two on off state keeps dutycycle alternately to be changed for 0.5 high frequency.
In a preferred embodiment：As the first HF switch S1, the 4th HF switch S4, the 5th HF switch S1a、
8th HF switch S2bClosure, the second HF switch S2, the 3rd HF switch S3, the 6th HF switch S1b, the 7th HF switch
S2aDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=4Ui；As the second HF switch S2,
Three HF switch S3, the 6th HF switch S1b, the 7th HF switch S2aClosure, the first HF switch S1, the 4th HF switch S4、
5th HF switch S1a, the 8th HF switch S2bDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd
=4Ui；And above two on off state keeps dutycycle alternately to be changed for 0.5 high frequency.
In a preferred embodiment：As the first HF switch S1, the 6th HF switch S1b, the 8th HF switch S2bClosure,
Second HF switch S2, the 3rd HF switch S3, the 4th HF switch S4, the 5th HF switch S1a, the 7th HF switch S2aIt is disconnected
When opening, the voltage U of bridge type modular multi-level switching capacity module outputd=2Ui；As the second HF switch S2, the 5th high frequency opens
Close S1a, the 7th HF switch S2aClosure, the first HF switch S1, the 3rd HF switch S3, the 4th HF switch S4, the 6th high frequency
Switch S1b, the 8th HF switch S2bDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=2Ui；And
Above two on off state keeps dutycycle alternately to be changed for 0.5 high frequency.
In a preferred embodiment：The inversion module uses full-bridge inverting structure, including HF switch S5、S6、S7、S8。
In a preferred embodiment：Dead band δ is set in the control signal of the inversion module, when control signal is positioned at described
During the δ of dead band, the HF switch S of inversion module5、S6、S7、S8It is in off-state.
Compared to prior art, technical scheme possesses following beneficial effect：
The multi-electrical level inverter based on bridge-type modular switch electric capacity that the present invention is provided, produces Ui, 2Ui, 4UiThree kinds defeated
Go out level synthesis staircase waveform input inversion module, selected on the basis of conventional SPWM control strategies according to the height of busbar voltage
The amplitude of corresponding triangular wave (carrier wave), exports the sinusoidal voltage of continuous-stable.Compared with conventional inverter, above-mentioned inverter exists
Realize on the basis of DC-DC-AC conversions, improve voltage gain and power density, reduce system loss；Effectively reduce simultaneously
The switching tube number of multi-level inverse conversion part, reduces harmonic content, improves output waveform quality, significantly reduce electromagnetism
The problems such as disturbing (EMI).
Brief description of the drawings
Fig. 1 is the multi-electrical level inverter based on bridge-type modular switch electric capacity in the embodiment of the present invention；
Fig. 2 is bridge type modular multi-level switching capacity module switch drive signal and output voltage in the embodiment of the present invention
Timing diagram；
Fig. 3 is bridge type modular multi-level switching capacity module working condition in the embodiment of the present invention, wherein：
A is state I；B, c are state I I；D, e are state I II, and f, g are state I V；
Fig. 4 is inversion module topology in the embodiment of the present invention；
Fig. 5 is inversion module switching drive signal figure in the embodiment of the present invention；
Fig. 6 is inversion module output waveform figure in the embodiment of the present invention；
Fig. 7 is the inversion module output waveform figure with dead band in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
With reference to the accompanying drawings and examples, the present invention is further elaborated.
With reference to Fig. 1, as seen from the figure, the inverter can be divided into bridge type modular multi-level switching capacity module and inversion module
Two parts.
Wherein, the bridge type modular multi-level switching capacity module includes H bridges and basic switch capacitance module；Wherein H
Bridge is made up of four full-controlled device switch mosfet pipes, respectively the first HF switch S1, the second HF switch S2, the 3rd high frequency
Switch S3, the 4th HF switch S4；Basic switch capacitance module includes the first capacitance network and the second capacitance network, and four
Full-controlled device switch mosfet pipe；First capacitance network includes the first electric capacity C being connected in series1aWith the second electric capacity C1b, the
Two capacitance networks include the 3rd electric capacity C being connected in series2aWith the 4th electric capacity C2b.Four full-controlled devices switch mosfet pipe
Respectively the 5th HF switch S1a, the 6th HF switch S1b, the 7th HF switch S2a, the 8th HF switch S2b.The bridge switch
Capacitance module can be by controlling HF switch S1、S2、S3、S4With S1a、S1b、S2a、S2bBreak-make realize three kinds of level output (Ui,
2Ui, 4Ui), and realize output voltage UdBy Ui→2Ui→4Ui→2Ui→UiConversion process, switching drive signal and voltage become
Change waveform as shown in Figure 2.Be to first half cycle now θ ∈ [0,180 °) when switch working state be analyzed as follows：
State I such as shown in Fig. 3 (a), now θ ∈ [0, α) U [180 ° of-α, 180 °).S1a、S1b、S2a、S2bClosure, S1、S2、
S3、S4Disconnect.It can be obtained from above
Ud=Ui (1)
State II such as shown in Fig. 3 (b) (c), now θ ∈ [α, β).S in Fig. 3 (b)1、S3、S1b、S2bClosure, S2、S4、S1a、
S2aDisconnect, constitute two loops：UiPass through S1、S2b、S1bTo C2bCharging, UiPass through S3、S1bTo C1bCharging, so when UC2b=
UC1b=Ui.S in Fig. 3 (c)2、S4、S1a、S2aClosure, S1、S3、S1b、S2bDisconnect, constitute two loops：UiPass through S1a、S2a、S2To
C2aCharging, UiPass through S1a、S4To C1aCharging, so when UC2a=UC1a=Ui.In state II, Fig. 3 (b) (c) on off state
The high frequency of dutycycle 0.5 is kept alternately to change, it can thus be concluded that
UC1a=UC1b=Ui,UC2a=UC2b=Ui (2)
Ud=2Ui (3)
State III such as shown in Fig. 3 (d) (e), now θ ∈ [β, 180 ° of-β).S in Fig. 3 (d)1、S4、S1a、S2bClosure, S2、S3、
S1b、S2aDisconnect, now constitute two loops：Loop 1 is by Ui、S1a、C1a、S4Composition, C1aCharging；Loop 2 is by Ui、S1、C2b、C1b、
S4Composition, Ui、C1bTo C2bElectric discharge.S in Fig. 3 (e)2、S3、S1b、S2aClosure, S1、S4、S1a、S2bDisconnect, now constitute loop：Return
Road 1 is by Ui、S3、C1b、S1bComposition, C1bCharging；Loop 2 is by Ui、S3、C1a、C2a、S2Composition, Ui、C1aTo C2aElectric discharge.Fig. 3 (d) (e)
On off state keep dutycycle 0.5 high frequency alternately change, now
UC1a=UC1b=Ui,UC2a=UC2b=2Ui (4)
Ud=4Ui (5)
State IV such as shown in Fig. 3 (f) (g), now θ ∈ [180 ° of-β, 180 ° of-α).S in Fig. 3 (f)1、S1b、S2bClosure, S2、
S3、S4、S1a、S2aDisconnect, C2bTo UiCharging；S in Fig. 3 (g)2、S1a、S2aClosure, S1、S3、S4、S1b、S2bDisconnect, C2aTo UiFill
Electricity.Fig. 3 (f) (g) on off state keeps the high frequency of dutycycle 0.5 alternately to change, now
UC2a=UC2b=Ui (6)
Ud=2Ui (7)
Above-mentioned bridge type modular multi-level switching capacity module output voltage UdIt is used as DC bus-bar voltage and inversion module
Connection, as shown in Figure 4.Inverter selects full-bridge inverting structure in the present invention, and switching device is respectively HF switch S5、S6、S7、
S8.Control technology uses the new SPWM control strategies based on monopole frequency multiplication SPWM, i.e., control plan in monopole frequency multiplication SPWM
The amplitude of corresponding carrier wave (triangular wave) is selected on the basis of slightly according to the height of busbar voltage, by carrier wave ladder to approach ginseng
Ripple (sine wave) is examined, to improve output waveform quality, harmonic content is reduced.
Inversion module switch drive waveform is as shown in Figure 5.As seen from the figure, herein with two opposite polarity reference sine waves
It is respectively 1/4U with amplitudeC、1/2UC、UCThe two-way triangular carrier of ladderization hand over to cut and produce a power switch drive signal, this kind
Control method not only possesses the switching loss advantage that monopole frequency multiplication SPWM reduces inverter bridge power tube, and due to the increasing of level number
Plus closer to sinusoidal waveform, effectively reduce harmonic content, improve the quality of power supply.
Ideally, to improve system effectiveness, realize that switching loss is minimized, the output current of switching capacity module exists
I should be met when θ=0 and θ=180 °d=0.But under the actual continuous operation mode of switching capacity module, θ=0 and θ=
I at 180 °dCan not possibly be 0.Therefore need to set dead band δ in inversion module control signal, as shown in figure 5, N=0,1,2, K
When, make θ ∈ [N180 ° of-δ, N180 ° of+δ], inversion module switch S5、S6、S7、S8It is in off-state.To sum up inversion mould
Block output waveform is as shown in Figure 6.
To realize the minimum of inversion module voltage conversion range, system conversion efficiency is improved, inversion module direct current is tackled
The phase parameter δ, α, β of busbar voltage optimize setting.As shown in Figure 7, UoAmplitude be limited in 4Ui, therefore make Uo=
4UiSin (θ), while the envelope voltage U to make inversion module high-frequency output voltageX,envWith UoThe minimum of difference, makes θ=α, θ
U during=βo=UX,env.It can thus be concluded that
Uo(α)=4UiSin (α)=Ui (8)
Uo(β)=4UiSin (β)=2Ui (9)
UX,envWith UoNormalization difference can useRepresent, as shown in Figure 7, θ=δ, θ=α, U during θ=βX,env
With UoDifference be likely to be breached maximum.Therefore difference maximum C to be optimized is represented by
Formula (8) (9) substitution formula (10) simplification can be obtained
Understood to work as by formula (11)When, UX,envWith UoDifference it is minimum.It can be calculated
In summary, provided herein is a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity.Inverter is transported
During row, bridge type modular multi-level switching capacity module produces Ui、2Ui、4UiThree kinds of output levels synthesize staircase waveform, as
Busbar voltage inputs inversion module, and corresponding three are selected according to the height of busbar voltage on the basis of conventional SPWM control strategies
The amplitude of angle ripple (carrier wave), then exports the sinusoidal voltage of continuous-stable via inversion module.It is above-mentioned compared with conventional inverter
Inverter improves voltage gain and power density, reduces system loss on the basis of DC-DC-AC conversions are realized；Simultaneously
The switching tube number of multi-level inverse conversion part is effectively reduced, harmonic content is reduced, output waveform quality is improved, subtracts significantly
Light electromagnetic interference (EMI).
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.This specification (including any accessory claim, summary and
Accompanying drawing) disclosed in any feature, can alternative features equivalent by other or with similar purpose replaced.That is, unless
Especially narration, each feature is an example in a series of equivalent or similar characteristics.
The invention is not limited in foregoing embodiment.Above-described embodiment should not be considered as the model of the limitation present invention
Enclose.Those skilled in the art can modify and change while foregoing detailed description is read and understood.Specifically
Protection domain should be defined by claims.
Claims (6)
1. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity, it is characterised in that include bridge type modular multi-level
Switching capacity module and inversion module two parts；In system operation, first by bridge type modular multi-level switching capacity module
Output voltage U is realized in DC-DC conversioni→2Ui→4Ui→2Ui→UiConversion process, then realize DC-AC via inversion module
Conversion；Wherein, UiFor input voltage；
The bridge type modular multi-level switching capacity module includes H bridges and basic switch capacitance module；Wherein H bridges are complete by four
Control device switch mosfet pipe composition, respectively the first HF switch S1, the second HF switch S2, the 3rd HF switch S3, the 4th
HF switch S4；Basic switch capacitance module includes the first capacitance network and the second capacitance network, and four full-controlled devices
Switch mosfet pipe, respectively the 5th HF switch S1a, the 6th HF switch S1b, the 7th HF switch S2a, the 8th HF switch
S2b；5th HF switch S1aDrain electrode, the 7th HF switch S2aSource electrode and the first capacitance network in electric capacity C1aConnection, the
Seven HF switches switch S2aDrain electrode with the second capacitance network in electric capacity C2aConnection, the 6th HF switch S1bSource electrode, the 8th
HF switch S2bDrain electrode with the first capacitance network in electric capacity C1bConnection, the 8th HF switch S2bSource electrode and the second electric capacity
Electric capacity C in network2bConnection；The first bridge arm of H bridges midpoint, i.e. the first HF switch S1Source electrode and the second HF switch S2Leakage
The tie point of pole and the electric capacity C in the second capacitance network of switching capacity module2a、C2bConnection；The second bridge arm of H bridges midpoint,
That is the 3rd HF switch S3Source electrode and the 4th HF switch S4In the tie point of drain electrode and the first capacitance network of switching capacity module
Electric capacity C1a、C1bConnection；5th HF switch S of switching capacity module1aSource electrode and the first HF switch of H bridges S1It is high with the 3rd
Frequency switch S3Drain electrode connection, the 6th HF switch S1bDrain electrode and the second HF switch of H bridge switch S2With the 4th HF switch S4
Source electrode connection；
As the 5th HF switch S1a, the 6th HF switch S1b, the 7th HF switch S2a, the 8th HF switch S2bClosure, the
One HF switch S1, the second HF switch S2, the 3rd HF switch S3, the 4th HF switch S4During disconnection, how electric bridge-type modularization is
It is opened flat the voltage U for closing capacitance module outputd=Ui。
2. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, it is characterised in that：
As the first HF switch S1, the 3rd HF switch S3, the 6th HF switch S1b, the 8th HF switch S2bClosure, second is high
Frequency switch S2, the 4th HF switch S4, the 5th HF switch S1a, the 7th HF switch S2aDuring disconnection, bridge type modular multi-level
The voltage U of switching capacity module outputd=2Ui；As the second HF switch S2, the 4th HF switch S4, the 5th HF switch S1a、
7th HF switch S2aClosure, the first HF switch S1, the 3rd HF switch S3, the 6th HF switch S1b, the 8th HF switch
S2bDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=2Ui；And above two on off state is kept
Dutycycle is alternately changed for 0.5 high frequency.
3. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, it is characterised in that：
As the first HF switch S1, the 4th HF switch S4, the 5th HF switch S1a, the 8th HF switch S2bClosure, second is high
Frequency switch S2, the 3rd HF switch S3, the 6th HF switch S1b, the 7th HF switch S2aDuring disconnection, bridge type modular multi-level
The voltage U of switching capacity module outputd=4Ui；As the second HF switch S2, the 3rd HF switch S3, the 6th HF switch
S1b, the 7th HF switch S2aClosure, the first HF switch S1, the 4th HF switch S4, the 5th HF switch S1a, the 8th high frequency opens
Close S2bDuring disconnection, the voltage U of bridge type modular multi-level switching capacity module outputd=4Ui；And above two on off state is protected
The high frequency that dutycycle is 0.5 is held alternately to change.
4. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, it is characterised in that：
As the first HF switch S1, the 6th HF switch S1b, the 8th HF switch S2bClosure, the second HF switch S2, the 3rd high frequency opens
Close S3, the 4th HF switch S4, the 5th HF switch S1a, the 7th HF switch S2aDuring disconnection, bridge type modular multi-level switch
The voltage U of capacitance module outputd=2Ui；As the second HF switch S2, the 5th HF switch S1a, the 7th HF switch S2aClosure,
First HF switch S1, the 3rd HF switch S3, the 4th HF switch S4, the 6th HF switch S1b, the 8th HF switch S2bIt is disconnected
When opening, the voltage U of bridge type modular multi-level switching capacity module outputd=2Ui；And above two on off state keeps duty
Alternately changed than the high frequency for 0.5.
5. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, it is characterised in that：
The inversion module uses full-bridge inverting structure, including HF switch S5、S6、S7、S8。
6. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 5, it is characterised in that：
Dead band δ is set in the control signal of the inversion module, and when control signal is located at the dead band δ, the high frequency of inversion module is opened
Close S5、S6、S7、S8It is in off-state.
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| CN105071679B (en) * | 2015-07-20 | 2017-09-15 | 厦门大学 | The five level self-balancing inverters based on bridge switch capacitance module |
| CN106169885B (en) * | 2016-07-15 | 2019-02-12 | 华东交通大学 | A kind of switch of tandem type six multi-electrical level inverter |
| US10205379B2 (en) | 2017-01-05 | 2019-02-12 | General Electric Company | Multilevel inverter for cryogenic power systems |
| US10250156B2 (en) | 2017-01-05 | 2019-04-02 | General Electric Company | Cryogenic fuel power system |
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