CN104753377A - Multilevel inverter based on bridge modular switched capacitor - Google Patents

Multilevel inverter based on bridge modular switched capacitor Download PDF

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CN104753377A
CN104753377A CN201510192526.9A CN201510192526A CN104753377A CN 104753377 A CN104753377 A CN 104753377A CN 201510192526 A CN201510192526 A CN 201510192526A CN 104753377 A CN104753377 A CN 104753377A
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switch
bridge
type modular
voltage
module
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CN104753377B (en
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何良宗
程琛
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Xiamen University
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Xiamen University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—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 multilevel inverter based on a bridge modular switched capacitor. The multilevel inverter comprises a bridge modular multilevel switched capacitor module and an inverting module. During running of a system, the bridge modular multilevel switched capacitor module performs a conversion process of output voltage U<i>, 2U<i>, 4U<i> and U<i> through DC-DC conversion and performs DC-AC conversion through the inverting module. The multilevel inverter allows DC-DC conversion to be performed under high efficiency, high power density and high-voltage conversion ratio, a unipolar multi-frequency SPWM (sinusoidal PWM) method in the DC-AC conversion is optimized, the number of switch tubes is less than that of the traditional multilevel inverter module, and high-quality output waveform and low-harmonic content are achieved.

Description

A kind of multi-electrical level inverter based on bridge-type modular switch electric capacity
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 problem of environmental pollution caused in the finiteness of world's fossil energy and exploitation process becomes increasingly conspicuous, and has become the Main Bottleneck of restriction World Economics sustainable development, and the exploitation of clean regenerative resource are subject to countries in the world and pay much attention to.Parallel network power generation utilizes one of form as the main of solar energy, receives the extraordinarily concern of people.
Increasingly mature along with technology, the problems such as the poor reliability, the efficiency that exist for the centralized photovoltaic parallel in system of tradition are low, poor expandability, there has been proposed the concept of Miniature inverter, separately electric energy conversion is carried out to every block battery, efficiently solve the integrity problem of centralized grid-connected system, for realizing high-quality, efficient, stable, cheap grid-connecting apparatus indicates new direction.
Inverter is as the capital equipment of photovoltaic array and grid interface, and its performance decides the performance of whole photovoltaic generating system.In order to the electric energy feed-in electrical network to greatest extent that photovoltaic array is produced, and improve its stability run, reliability and accuracy, must select the main circuit topology of combining inverter, filter parameter designs and control strategy to be chosen etc. and furtherd investigate.
Inverter structure common at present single stage type can be divided into convert according to the progression of power conversion and multistage converts two kinds of topological projects, wherein the DC-DC-AC two-stage type Topological Simplification control method of every one-level, makes every one-level can be absorbed in quality and the efficiency of each automatic control method.The DC voltage conversion link of conventional inverter is mainly boost circuit, and the VD of distributed power source receives DC-AC transform part, to meet grid-connected conditions after pump rises.But because the voltage lifting of Boost circuit is limited in one's ability, the receptive distributed power source DC voltage change scope of combining inverter institute is generally narrow, meanwhile, traditional boost type perception transducer effciency is general not high.In addition common at present monolithic photovoltaic battery panel output voltage mostly is 20-50V, and China's line voltage peak value is 311V.Thus how to improve DC converting link voltage no-load voltage ratio, realize high efficiency, the DC-DC conversion of low cost caused the extensive concern of people.
Meanwhile, advanced control technology is adopted also effectively can to improve the performance of photovoltaic parallel in system.The appearance of the high frequency of power electronic device and the raising, particularly high-performance digital signal processor (DSP) of microprocessor arithmetic speed, for the application of the control strategy of some advanced persons provides condition.Conventional sinusoidal pulse width modulation (SPWM) mode is mainly divided into unipolarity modulation, bipolar modulation and unipolarity multiple-frequency modulation mode.Compared with bipolar modulation, unipolarity modulation possess harmonic component little, be easy to eliminate, to advantages such as the harmonic wave interference reduction of external equipment, switch stress are little.And the frequency multiplication phenomenon of unipolarity modulation can make the umber of pulse of inverter output voltage extraordinarily, is also beneficial to and reduces system harmonics and the interference to outside.
Summary of the invention
Technical problem underlying to be solved by this invention is to provide a kind of multi-electrical level inverter based on Novel bridge type modular switch electric capacity, achieve the high efficiency of DC-DC transform part, high power density and high-voltage variable ratio, the innovation of DC-AC transform part is optimized unipolarity frequency multiplication SPWM mode, while relative traditional multi-level inversion module effectively reduces switching tube quantity, achieve high-quality output waveform and low harmonic content.
In order to solve above-mentioned technical problem, the invention provides a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity, comprising bridge type modular multi-level switching capacity module and inversion module two parts; In system operation, first converted by bridge type modular multi-level switching capacity module DC-DC and realize output voltage U i→ 2U i→ 4U i→ 2U i→ U iconversion process, then via inversion module realize DC-AC conversion.
In a preferred embodiment: described bridge type modular multi-level switching capacity module comprises H bridge and basic switch capacitance module; Wherein H bridge is made up of four full control device switch mosfet pipes, is respectively the first HF switch S 1, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4; Basic switch capacitance module comprises the first capacitance network and the second capacitance network, and four control device switch mosfet pipe entirely, are respectively the 5th HF switch S 1a, the 6th HF switch S 1b, the 7th HF switch S 2a, the 8th HF switch S 2b.
In a preferred embodiment: as described 5th HF switch S 1a, the 6th HF switch S 1b, the 7th HF switch S 2a, the 8th HF switch S 2bclosed, the first HF switch S 1, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4during disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=U i.
In a preferred embodiment: as described first HF switch S 1, third high frequently switch S 3, the 6th HF switch S 1b, the 8th HF switch S 2bclosed, the second HF switch S 2, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; As the second HF switch S 2, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aclosed, the first HF switch S 1, third high frequently switch S 3, the 6th HF switch S 1b, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
In a preferred embodiment: as described first HF switch S 1, the 4th HF switch S 4, the 5th HF switch S 1a, the 8th HF switch S 2bclosed, the second HF switch S 2, third high frequently switch S 3, the 6th HF switch S 1b, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=4U i; As described second HF switch S 2, third high frequently switch S 3, the 6th HF switch S 1b, the 7th HF switch S 2aclosed, the first HF switch S 1, the 4th HF switch S 4, the 5th HF switch S 1a, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=4U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
In a preferred embodiment: as the first HF switch S 1, the 6th HF switch S 1b, the 8th HF switch S 2bclosed, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; As the second HF switch S 2, the 5th HF switch S 1a, the 7th HF switch S 2aclosed, the first HF switch S 1, third high frequently switch S 3, the 4th HF switch S 4, the 6th HF switch S 1b, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
In a preferred embodiment: described inversion module adopts full-bridge inverting structure, comprises HF switch S 5, S 6, S 7, S 8.
In a preferred embodiment: dead band δ is set in the control signal of described inversion module, when control signal is positioned at described dead band δ, the HF switch S of inversion module 5, S 6, S 7, S 8all be in off-state.
Compared to prior art, technical scheme of the present invention possesses following beneficial effect:
Multi-electrical level inverter based on bridge-type modular switch electric capacity provided by the invention, produces U i, 2U i, 4U ithree kinds of output level synthesis staircase waveform input inversion modules, the basis of conventional SPWM control strategy are selected according to the height of busbar voltage the amplitude of corresponding triangular wave (carrier wave), export the sinusoidal voltage of continous-stable.Compared with conventional inverter, above-mentioned inverter, on the basis realizing DC-DC-AC conversion, improves voltage gain and power density, reduces system loss; Effectively reduce the switching tube number of multi-level inverse conversion part simultaneously, reduce harmonic content, improve output waveform quality, significantly reduce the problems such as electromagnetic interference (EMI).
Accompanying drawing explanation
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 singal and output voltage sequential chart in the embodiment of the present invention;
Fig. 3 is bridge type modular multi-level switching capacity module work state in the embodiment of the present invention, wherein:
A is state I; B, c are state I I; D, e are state I II, f, g is 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
Hereafter the present invention will be further described in conjunction with the accompanying drawings and embodiments.
Below in conjunction with drawings and Examples, the present invention is further elaborated.
With reference to figure 1, as seen from the figure, this inverter can be divided into bridge type modular multi-level switching capacity module and inversion module two parts.
Wherein, described bridge type modular multi-level switching capacity module comprises H bridge and basic switch capacitance module; Wherein H bridge is made up of four full control device switch mosfet pipes, is respectively the first HF switch S 1, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4; Basic switch capacitance module comprises the first capacitance network and the second capacitance network, and four control device switch mosfet pipe entirely; Described first capacitance network comprises the first electric capacity C be connected in series 1awith the second electric capacity C 1b, the second capacitance network comprises the 3rd electric capacity C be connected in series 2awith the 4th electric capacity C 2b.Described four full control device switch mosfet pipes are respectively the 5th HF switch S 1a, the 6th HF switch S 1b, the 7th HF switch S 2a, the 8th HF switch S 2b.This bridge switch capacitance module is by controlling HF switch S 1, S 2, S 3, S 4with S 1a, S 1b, S 2a, S 2bbreak-make realize three kinds of level and export (U i, 2U i, 4U i), and realize output voltage U dby U i→ 2U i→ 4U i→ 2U i→ U iconversion process, switching drive signal and voltage transformation waveform are as shown in Figure 2.Now to front half period and θ ∈ [0,180 °) time switch working state be analyzed as follows:
State I as shown in Fig. 3 (a), now θ ∈ [0, α) U [180 ° of-α, 180 °).S 1a, S 1b, S 2a, S 2bclosed, S 1, S 2, S 3, S 4disconnect.Can obtain from above
U d＝U i(1)
State II as shown in Fig. 3 (b) (c), now θ ∈ [α, β).S in Fig. 3 (b) 1, S 3, S 1b, S 2bclosed, S 2, S 4, S 1a, S 2adisconnect, form two loop: U ipass through S 1, S 2b, S 1bto C 2bcharging, U ipass through S 3, S 1bto C 1bcharging, so time U c2b=U c1b=U i.S in Fig. 3 (c) 2, S 4, S 1a, S 2aclosed, S 1, S 3, S 1b, S 2bdisconnect, form two loop: U ipass through S 1a, S 2a, S 2to C 2acharging, U ipass through S 1a, S 4to C 1acharging, so time U c2a=U c1a=U i.In state II, the on off state of Fig. 3 (b) (c) keeps the high frequency alternately conversion of duty ratio 0.5, can obtain thus
U C1a＝U C1b＝U i,U C2a＝U C2b＝U i(2)
U d＝2U i(3)
State III as shown in Fig. 3 (d) (e), now θ ∈ [β, 180 ° of-β).S in Fig. 3 (d) 1, S 4, S 1a, S 2bclosed, S 2, S 3, S 1b, S 2adisconnect, now form two loops: loop 1 is by U i, S 1a, C 1a, S 4composition, C 1acharging; Loop 2 is by U i, S 1, C 2b, C 1b, S 4composition, U i, C 1bto C 2belectric discharge.S in Fig. 3 (e) 2, S 3, S 1b, S 2aclosed, S 1, S 4, S 1a, S 2bdisconnect, now form loop: loop 1 is by U i, S 3, C 1b, S 1bcomposition, C 1bcharging; Loop 2 is by U i, S 3, C 1a, C 2a, S 2composition, U i, C 1ato C 2aelectric discharge.The on off state of Fig. 3 (d) (e) keeps the high frequency alternately conversion of duty ratio 0.5, now
U C1a＝U C1b＝U i,U C2a＝U C2b＝2U i(4)
U d＝4U i(5)
State IV as shown in Fig. 3 (f) (g), now θ ∈ [180 ° of-β, 180 ° of-α).S in Fig. 3 (f) 1, S 1b, S 2bclosed, S 2, S 3, S 4, S 1a, S 2adisconnect, C 2bto U icharging; S in Fig. 3 (g) 2, S 1a, S 2aclosed, S 1, S 3, S 4, S 1b, S 2bdisconnect, C 2ato U icharging.The on off state of Fig. 3 (f) (g) keeps the high frequency alternately conversion of duty ratio 0.5, now
U C2a＝U C2b＝U i(6)
U d＝2U i(7)
Above-mentioned bridge type modular multi-level switching capacity module output voltage U dbe connected with inversion module as DC bus-bar voltage, as shown in Figure 4.In the present invention, full-bridge inverting structure selected by inverter, and switching device is respectively HF switch S 5, S 6, S 7, S 8.Control technology adopts the New type of S PWM control strategy based on one pole frequency multiplication SPWM, namely on the basis of one pole frequency multiplication SPWM control strategy, the amplitude of corresponding carrier wave (triangular wave) is selected according to the height of busbar voltage, by carrier wave ladder to approach reference wave (sine wave), to improve output waveform quality, reduce harmonic content.
Inversion module switch drive waveform as shown in Figure 5.As seen from the figure, 1/4U is respectively with two opposite polarity reference sine waves and amplitude herein c, 1/2U c, U cthe two-way triangular carrier of ladderization hand over to cut and produce a power switch drive singal, this kind of control method has not only possessed the switching loss advantage that one pole frequency multiplication SPWM reduces inverter bridge power tube, and because the increase of level number is closer to sinusoidal waveform, effectively reduce harmonic content, improve the quality of power supply.
Ideally, for improving system effectiveness, realize switching loss and minimize, the output current of switching capacity module should meet I when θ=0 and θ=180 ° d=0.But under the switching capacity module continuous operation mode of reality, I when θ=0 and θ=180 ° dcan not be 0.Therefore need to arrange dead band δ in inversion module control signal, as shown in Figure 5, N=0, during 1,2, K, makes θ ∈ [N180 °-δ, N180 °+δ], inversion module switch S 5, S 6, S 7, S 8all be in off-state.To sum up inversion module output waveform as shown in Figure 6.
For realizing minimizing of inversion module voltage conversion range, improve system conversion efficiency, the phase parameter δ of reply inversion module DC bus-bar voltage, α, β are optimized setting.As shown in Figure 7, U oamplitude be limited in 4U i, therefore make U o=4U isin (θ), simultaneously for making the envelope voltage U of inversion module high-frequency output voltage x, envwith U ominimizing of difference, makes θ=α, U during θ=β o=U x, env.Can obtain thus
U o(α)＝4U isin(α)＝U i(8)
U o(β)＝4U isin(β)＝2U i(9)
U x, envwith U onormalization difference can use represent, as shown in Figure 7, U during θ=δ, θ=α, θ=β x, envwith U odifference may reach maximum.Therefore difference maximum C to be optimized can be expressed as
C = max [ U i - 4 U i sin ( &delta; ) 4 U i sin ( &delta; ) , 2 U i - 4 U i sin ( &alpha; ) 4 U i sin ( &alpha; ) , 4 U i - 4 U i sin ( &beta; ) 4 U i sin ( &beta; ) ] - - - ( 10 )
Formula (8) (9) are substituted into formula (10) to simplify and can obtain
C = max [ U i - 4 U i sin ( &delta; ) 4 U i sin ( &delta; ) , 1,1 ] - - - ( 11 )
Work as by formula (11) is known time, U x, envwith U odifference minimum.Can be calculated
In sum, a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity provided herein.In invertor operation process, bridge type modular multi-level switching capacity module produces U i, 2U i, 4U ithree kinds of output level synthesis staircase waveforms, as busbar voltage input inversion module, the basis of conventional SPWM control strategy is selected according to the height of busbar voltage the amplitude of corresponding triangular wave (carrier wave), then exports the sinusoidal voltage of continous-stable via inversion module.Compared with conventional inverter, above-mentioned inverter, on the basis realizing DC-DC-AC conversion, improves voltage gain and power density, reduces system loss; Effectively reduce the switching tube number of multi-level inverse conversion part simultaneously, reduce harmonic content, improve output waveform quality, significantly reduce electromagnetic interference (EMI).
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.Arbitrary feature disclosed in this specification (comprising any accessory claim, summary and accompanying drawing), all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
The present invention is not limited to aforesaid embodiment.Above-described embodiment should not be considered as limiting the scope of the invention.Those skilled in the art is reading and while understanding of aforementioned detailed description, can modify and change.Concrete protection range should be as the criterion with claims.

Claims (8)

1., based on a multi-electrical level inverter for bridge-type modular switch electric capacity, it is characterized in that comprising bridge type modular multi-level switching capacity module and inversion module two parts; In system operation, first converted by bridge type modular multi-level switching capacity module DC-DC and realize output voltage U i→ 2U i→ 4U i→ 2U i→ U iconversion process, then via inversion module realize DC-AC conversion.
2. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, is characterized in that: described bridge type modular multi-level switching capacity module comprises H bridge and basic switch capacitance module; Wherein H bridge is made up of four full control device switch mosfet pipes, is respectively the first HF switch S 1, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4; Basic switch capacitance module comprises the first capacitance network and the second capacitance network, and four control device switch mosfet pipe entirely, are respectively the 5th HF switch S 1a, the 6th HF switch S 1b, the 7th HF switch S 2a, the 8th HF switch S 2b.
3. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 2, is characterized in that: as described 5th HF switch S 1a, the 6th HF switch S 1b, the 7th HF switch S 2a, the 8th HF switch S 2bclosed, the first HF switch S 1, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4during disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=U i.
4. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 2, is characterized in that: as described first HF switch S 1, third high frequently switch S 3, the 6th HF switch S 1b, the 8th HF switch S 2bclosed, the second HF switch S 2, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; As the second HF switch S 2, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aclosed, the first HF switch S 1, third high frequently switch S 3, the 6th HF switch S 1b, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
5. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 2, is characterized in that: as described first HF switch S 1, the 4th HF switch S 4, the 5th HF switch S 1a, the 8th HF switch S 2bclosed, the second HF switch S 2, third high frequently switch S 3, the 6th HF switch S 1b, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=4U i; As described second HF switch S 2, third high frequently switch S 3, the 6th HF switch S 1b, the 7th HF switch S 2aclosed, the first HF switch S 1, the 4th HF switch S 4, the 5th HF switch S 1a, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=4U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
6. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 2, is characterized in that: as the first HF switch S 1, the 6th HF switch S 1b, the 8th HF switch S 2bclosed, the second HF switch S 2, third high frequently switch S 3, the 4th HF switch S 4, the 5th HF switch S 1a, the 7th HF switch S 2aduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; As the second HF switch S 2, the 5th HF switch S 1a, the 7th HF switch S 2aclosed, the first HF switch S 1, third high frequently switch S 3, the 4th HF switch S 4, the 6th HF switch S 1b, the 8th HF switch S 2bduring disconnection, the voltage U that bridge type modular multi-level switching capacity module exports d=2U i; And above-mentioned two kinds of on off states maintenance duty ratio is the high frequency alternately conversion of 0.5.
7. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 1, is characterized in that: described inversion module adopts full-bridge inverting structure, comprises HF switch S 5, S 6, S 7, S 8.
8. a kind of multi-electrical level inverter based on bridge-type modular switch electric capacity according to claim 7, is characterized in that: arrange dead band δ in the control signal of described inversion module, when control signal is positioned at described dead band δ, and the HF switch S of inversion module 5, S 6, S 7, S 8all be in off-state.
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CN106169885A (en) * 2016-07-15 2016-11-30 华东交通大学 A kind of tandem type six switchs multi-electrical level inverter
CN107222112A (en) * 2017-08-04 2017-09-29 厦门大学 A kind of bidirectional bridge type modular switch electric capacity AC AC current transformers regulate and control method
CN107276398A (en) * 2017-06-27 2017-10-20 厦门大学 Photomultiplier power supply based on Switching capacitors
CN108566108A (en) * 2018-04-20 2018-09-21 厦门大学 A kind of nine electrical level inverter of two-stage type based on bridge type multi-electrical level switching capacity module
US10205379B2 (en) 2017-01-05 2019-02-12 General Electric Company Multilevel inverter for cryogenic power systems
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CN110233498A (en) * 2019-06-14 2019-09-13 郑州大学 A kind of grid-connected multi-level inverse conversion device of dual input and its control method

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