CN105871239A - Method for suppressing leakage current of cascade multi-level inverter and inverter - Google Patents
Method for suppressing leakage current of cascade multi-level inverter and inverter Download PDFInfo
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- CN105871239A CN105871239A CN201610292291.5A CN201610292291A CN105871239A CN 105871239 A CN105871239 A CN 105871239A CN 201610292291 A CN201610292291 A CN 201610292291A CN 105871239 A CN105871239 A CN 105871239A
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- inversion
- inversion unit
- leakage current
- bridge
- bridge module
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001629 suppression Effects 0.000 claims abstract description 11
- 230000003071 parasitic effect Effects 0.000 claims description 24
- 230000010363 phase shift Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000024241 parasitism Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- 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
-
- H02J3/383—
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a method for suppressing the leakage current of a cascade multi-level inverter. The method is especially suitable for a cascade system with an even number of H-bridge modules and also has a certain suppression effect on a cascade system with an odd number of H-bridge modules. By controlling the action of each H-bridge module switch, the sum of voltages of all stray capacitors is a constant value. According to the relation of the capacitor voltages and currents, it is known that the theoretical leakage current should be 0, so that the leakage current is effectively suppressed, and the grid-connected standard is met.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of suppression cascaded multilevel inverter leakage
The method of electric current and inverter.
Background technology
Along with the continuous minimizing of the energy, photovoltaic power generation technology has obtained quick development.At present, non-isolated
Grid-connected photovoltaic system in, there is directly electrical connection between photovoltaic array and electrical network, i.e. do not have
There is electrical isolation.Solar cell and grounding shell is made directly to there is parasitic capacitance over the ground, and this
Electric capacity can be with inverter output filter element and electric network impedance composition common mode resonance loop.High at inverter
Under the effect of frequency switch, parasitic capacitance can produce leakage current, and this leakage current can affect photovoltaic generating system
Efficiency and generation electromagnetic interference.
Cascaded H-bridges inverter is as the one of non-isolation type inverter, as it is shown in figure 1, its leakage current has
Valid value increases along with the increase of module number, when leakage current is bigger (more than 300mA), and inverter
Can disconnect with electrical network.
Visible, the leakage current how reducing non-isolated inverter is a most urgently to be resolved hurrily problem.
Summary of the invention
In view of this, the invention provides a kind of method suppressing cascaded multilevel inverter leakage current, energy
The voltage sum enough making the parasitic capacitance of described inversion unit is fixed value, reduces leakage current.
For achieving the above object, the invention provides a kind of side suppressing cascaded multilevel inverter leakage current
Method, is applied at least one inversion unit, and each described inversion unit includes two H bridge modules cascaded,
By controlling the switch motion in each described H bridge module, make the parasitic capacitance of described inversion unit
Voltage sum be fixed value.
Preferably, the switch motion in each described H bridge module of described control includes:
Obtaining switch combination, the voltage sum making the parasitic capacitance of described inversion unit is described H bridge module
DC voltage vdc, described switch combination is:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combines: 1010-1000-1100-0011-0001-0101；
3rd switch combination: 1010-1110-1100-0011-0111-0101；
4th switch combination: 1010-1000-1100-0011-0001-0101；
Control described H bridge module and carry out switch motion according to described switch combination.
Preferably, two described H bridge modules in each described inversion unit use the carrier wave that phase place is identical
Stacking is modulated.
Preferably, described inversion unit is even number,
Two described inversion units are an inversion group, a described inversion in each described inversion group
One described H bridge module of unit and a described H bridge module of another described inversion unit share the
Another described H bridge of one switching signal, another described H bridge module and another described inversion unit
Module shares second switch signal.
Preferably, between different inversion groups, use phase-shifting carrier wave modulation, open heightening level number and equivalence
Close frequency.
Preferably, described inversion unit is odd number,
Two described inversion units are an inversion group, a described inversion in each described inversion group
One described H bridge module of unit and a described H bridge module of another described inversion unit share the
Another described H bridge of three switching signals, another described H bridge module and another described inversion unit
Module shares the 4th switching signal；
Another described inversion unit is another inversion group, and uses carrier wave between different inversion group
Phase shift modulation.
A kind of cascaded multilevel inverter, including at least one inversion unit, each described inversion unit bag
Include the H bridge module of two cascades,
Described inverter, by controlling the switch motion in each described H bridge module, makes described inversion unit
The voltage sum of parasitic capacitance be fixed value.
Understand via above-mentioned technical scheme, compared with prior art, the invention provides a kind of killer stage
The method of connection multi-electrical level inverter leakage current, what the method was particularly suited for the cascade of even number H bridge module is
System, and the system of odd number H bridge module cascade is also had certain inhibitory action.By controlling each H
The action of bridge module switch, making all parasitic capacitor voltage sums is steady state value.By capacitance voltage and electric current
Relation understand, leakage current should be 0 in theory, thus effectively suppresses leakage current, meets and generates electricity by way of merging two or more grid systems mark
Accurate.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of prior art cascade H bridge inverter；
Fig. 2 is the common mode equivalent circuit figure of cascaded H-bridges inverter；
Fig. 3 is the structural representation of a kind of cascaded multilevel inverter disclosed in the embodiment of the present invention one；
Fig. 4 is the computing formula schematic diagram of parasitic capacitor voltage disclosed in the embodiment of the present invention one；
Fig. 5 is the computing formula schematic diagram of the embodiment of the present invention one another parasitic capacitor voltage disclosed；
The method of another suppression cascaded multilevel inverter leakage current that Fig. 6 provides for using the present invention is divided
The module diagram joined.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the present invention one provides a kind of method suppressing cascaded multilevel inverter leakage current, application
In at least one inversion unit, each described inversion unit includes two H bridge modules cascaded, by control
Make the switch motion in each described H bridge module, make the voltage sum of the parasitic capacitance of described inversion unit
For fixed value.
Inventor finds during research and development this programme, and grid power leakage stream is each stray capacitance currents
Sum, it is assumed that the parasitic capacitance of modules is equal, the then leakage current between photovoltaic panel and electrical network and electric capacity
The rate of change of voltage sum is directly proportional.
Refer to the common mode equivalent circuit figure that Fig. 2, Fig. 2 are cascaded H-bridges inverter, according to kirchhoff
Voltage x current law, obtains the expression formula of common-mode voltage in each parasitic capacitance as follows:
From the root of equation group it can be seen that parasitic capacitance magnitude of voltage be this module common mode component, other
The half sum of 1/2nd and line voltage of the differential mode of module, the wherein mould above this module
Block differential mode symbol is just, the module differential mode symbol below this module is negative.
Knowable to aforesaid equation, the common-mode voltage of each parasitic capacitance comprises high-frequency PWM signal and electrical network
Power frequency component.Little on the impact of leakage current in view of power frequency component, can ignore.So if able to
Ensure that each parasitic capacitor voltage medium-high frequency voltage (PWM voltage) sum keeps constant, it becomes possible to very well
Suppression grid power leakage stream.I.e. suppression leakage current seeks to maintain parasitic capacitor voltage sum constant.
In conjunction with table 1, table 1 be two modules switching sequence under the relation of output voltage and common-mode voltage, as
Under:
Table 1
From upper table can knowable to, some level (such as ± Vdc, 0) switch has redundant state amount, and adjustment is opened
Close the state of combination, just can make Vcpv1+Vcpv2 (i.e.)
Constant, thus reduce system leakage current.
In this embodiment, it is also possible to obtain switch combination, so that the electricity of the parasitic capacitance of described inversion unit
Pressure sum is the DC voltage v of described H bridge moduledc, described switch combination is:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combines: 1010-1000-1100-0011-0001-0101；
3rd switch combination: 1010-1110-1100-0011-0111-0101；
4th switch combination: 1010-1000-1100-0011-0001-0101；
Afterwards, control described H bridge module and carry out switch motion according to described switch combination.Make described inversion
The voltage sum of the parasitic capacitance of unit is fixed value.
Concrete, in the present embodiment, two described H bridge modules in each described inversion unit use and change
Carrier wave stacking modulation (i.e. MPD modulation) that the phase place entered is identical.
Preferably, described inversion unit is even number, and wherein, two described inversion units are an inversion
Group, in each described inversion group a described H bridge module of a described inversion unit and another
One described H bridge module of described inversion unit shares the first switching signal, another described H bridge module
Second switch signal is shared with another described H bridge module of inversion unit another described.
On this basis, between different inversion groups, use phase-shifting carrier wave modulation, and each two inversion group
Carrier phase on the contrary to heighten level number and equivalent switching frequency.
In conjunction with the combination block diagram that Fig. 3, Fig. 3 are eight modules, it is analyzed as follows:
Two module one inversion units of composition, if module 1 and module 2 are inversion unit 1, module 3 He
Module 4 is inversion unit 2, and module 5 and module 6 are inversion unit 3, and module 7 and module 8 are inversion
Unit 4.
Wherein, each inversion unit uses the carrier wave stacking modulation that phase place is identical, so can ensure that parasitism
The voltage sum of electric capacity is that in fixed value, i.e. Fig. 4, the part of square frame is definite value.
One group of two unit compositions, as a example by group 1, module 1 and 8 common switch signal, mould
Block 2 and 7 common switch signal, it is ensured that the difference mode signal correspondent equal of generation, as shown in Figure 4,
Value in square frame 1 and square frame 2 is equal, and the value in square frame 3 and square frame 4 is equal, so each parasitic electricity
Hold and can cancel out each other both in voltage sum.
And, use PS modulation between group and group, use this modulation system, it is possible to increase equivalent switch
Frequency, increases level number simultaneously.
Except this, it is modulation effect during odd number that the present embodiment demonstrates inversion unit the most further, needs
Illustrating, when the number of inversion unit is odd number, two described inversion units are an inversion group,
In each described inversion group, a described H bridge module of a described inversion unit is inverse with another described
Become unit a described H bridge module share the 3rd switching signal, another described H bridge module and another
Another described H bridge module of individual described inversion unit shares the 4th switching signal；Another described inversion
Unit is another inversion group, and uses phase-shifting carrier wave modulation between different inversion group.
Concrete, as a example by 6 modules, illustrate:
Referring to Fig. 5 and Fig. 6, six modules are similar with the processing method of eight modules, are all by two moulds
Block is modulated as a unit, it is ensured that the Blocked portion in Fig. 5 is fixed value.It addition, two inverse
Become unit and be one group, module 1 and module 6 common switch signal, module 2 and 5 common switch signal,
Can ensure that the difference mode signal correspondent equal of generation, i.e. in Fig. 5, the value in square frame 1 and square frame 2 is equal,
Value in square frame 3 and square frame 4 is equal, and so in each parasitic capacitor voltage sum, both can mutually support
Disappear.
Unlike the packet of eight modules, six modules need by independent to module 3 and module 4 the most in groups,
As shown in Figure 6, and and group and group between use PS modulation, improve equivalent switching frequency, increase simultaneously
Level number.
Visible, the method for the suppression cascaded multilevel inverter leakage current that the present invention provides is applicable to number of modules
Cascaded inverter for 2n.
In sum, the invention provides a kind of method suppressing cascaded multilevel inverter leakage current, should
Method is particularly suited for the system of even number H bridge module cascade, and to odd number H bridge module cascade is
System also has certain inhibitory action.By controlling the action of each H bridge module switch, make all parasitic electricity
Holding voltage sum is steady state value.From the relation of capacitance voltage Yu electric current, leakage current should be 0 in theory,
Thus effectively suppress leakage current, meet standard of generating electricity by way of merging two or more grid systems.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, same or similar part sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (7)
1. the method suppressing cascaded multilevel inverter leakage current, it is characterised in that be applied at least
One inversion unit, each described inversion unit includes two H bridge modules cascaded,
By controlling the switch motion in each described H bridge module, make the parasitic capacitance of described inversion unit
Voltage sum be fixed value.
The method of suppression cascaded multilevel inverter leakage current the most according to claim 1, its feature
Being, the switch motion in each described H bridge module of described control includes:
Obtaining switch combination, the voltage sum making the parasitic capacitance of described inversion unit is described H bridge module
DC voltage vdc, described switch combination is:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combines: 1010-1000-1100-0011-0001-0101；
3rd switch combination: 1010-1110-1100-0011-0111-0101；
4th switch combination: 1010-1000-1100-0011-0001-0101；
Control described H bridge module and carry out switch motion according to described switch combination.
The method of suppression cascaded multilevel inverter leakage current the most according to claim 2, its feature
It is,
Two described H bridge modules in each described inversion unit use the carrier wave stacking that phase place is identical to adjust
System.
The method of suppression cascaded multilevel inverter leakage current the most according to claim 3, its feature
Being, described inversion unit is even number,
Two described inversion units are an inversion group, a described inversion in each described inversion group
One described H bridge module of unit and a described H bridge module of another described inversion unit share the
Another described H bridge of one switching signal, another described H bridge module and another described inversion unit
Module shares second switch signal.
The method of suppression cascaded multilevel inverter leakage current the most according to claim 4, its feature
It is,
Phase-shifting carrier wave modulation is used, to heighten level number and equivalent switching frequency between different inversion groups.
The method of suppression cascaded multilevel inverter leakage current the most according to claim 3, its feature
Being, described inversion unit is odd number,
Two described inversion units are an inversion group, a described inversion in each described inversion group
One described H bridge module of unit and a described H bridge module of another described inversion unit share the
Another described H bridge of three switching signals, another described H bridge module and another described inversion unit
Module shares the 4th switching signal；
Another described inversion unit is another inversion group, and uses carrier wave between different inversion group
Phase shift modulation.
7. a cascaded multilevel inverter, it is characterised in that include at least one inversion unit, each
Described inversion unit includes two H bridge modules cascaded,
Described inverter, by controlling the switch motion in each described H bridge module, makes described inversion unit
The voltage sum of parasitic capacitance be fixed value.
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| CN201610292291.5A CN105871239B (en) | 2016-04-29 | 2016-04-29 | A kind of method and inverter inhibiting cascaded multilevel inverter leakage current |
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| CN201610292291.5A CN105871239B (en) | 2016-04-29 | 2016-04-29 | A kind of method and inverter inhibiting cascaded multilevel inverter leakage current |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100413A (en) * | 2016-08-22 | 2016-11-09 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges five-electrical level inverter |
| CN106208654A (en) * | 2016-08-22 | 2016-12-07 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106301054A (en) * | 2016-08-31 | 2017-01-04 | 西安电子科技大学 | A kind of modified model POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN107508316A (en) * | 2017-08-24 | 2017-12-22 | 山东大学 | Dual-layer optimization global synchronization variable duration impulse system and method |
| CN112165269A (en) * | 2020-09-18 | 2021-01-01 | 浙江大学 | Control method of single-phase cascaded full-bridge multi-level converter and multi-level converter |
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| CN104578852A (en) * | 2013-10-11 | 2015-04-29 | 台达电子工业股份有限公司 | Solar photocell source converting system and operation method thereof |
| CN105450059A (en) * | 2015-12-22 | 2016-03-30 | 合肥工业大学 | Modulation method for suppressing leakage current of two-H-bridge cascaded inverter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100413A (en) * | 2016-08-22 | 2016-11-09 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges five-electrical level inverter |
| CN106208654A (en) * | 2016-08-22 | 2016-12-07 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106301054A (en) * | 2016-08-31 | 2017-01-04 | 西安电子科技大学 | A kind of modified model POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106301054B (en) * | 2016-08-31 | 2019-07-05 | 西安电子科技大学 | A kind of modified POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN107508316A (en) * | 2017-08-24 | 2017-12-22 | 山东大学 | Dual-layer optimization global synchronization variable duration impulse system and method |
| CN107508316B (en) * | 2017-08-24 | 2019-04-16 | 山东大学 | Dual-layer optimization global synchronization variable duration impulse system and method |
| CN112165269A (en) * | 2020-09-18 | 2021-01-01 | 浙江大学 | Control method of single-phase cascaded full-bridge multi-level converter and multi-level converter |
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| Publication number | Publication date |
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| CN105871239B (en) | 2019-09-20 |
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