CN105871239B - A kind of method and inverter inhibiting cascaded multilevel inverter leakage current - Google Patents
A kind of method and inverter inhibiting cascaded multilevel inverter leakage current Download PDFInfo
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- CN105871239B CN105871239B CN201610292291.5A CN201610292291A CN105871239B CN 105871239 B CN105871239 B CN 105871239B CN 201610292291 A CN201610292291 A CN 201610292291A CN 105871239 B CN105871239 B CN 105871239B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 17
- 230000003071 parasitic effect Effects 0.000 claims abstract description 24
- 238000012512 characterization method Methods 0.000 claims 4
- 230000010363 phase shift Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000024241 parasitism Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000750 progressive effect Effects 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 present invention provides a kind of methods for inhibiting cascaded multilevel inverter leakage current, and this method is particularly suitable for the cascade system of even number H bridge module, and also has certain inhibiting effect to the cascade system of odd number H bridge module.By controlling the movement of each H bridge module switch, making the sum of all parasitic capacitor voltages is steady state value.By the relationship of capacitance voltage and electric current it is found that theoretically leakage current should be 0, to effectively inhibit leakage current, meet standard of generating electricity by way of merging two or more grid systems.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation more particularly to a kind of sides for inhibiting cascaded multilevel inverter leakage current
Method and inverter.
Background technique
With the continuous reduction of the energy, photovoltaic power generation technology has obtained quick development.Currently, non-isolated is grid-connected
In electricity generation system, there is direct electrical connection, i.e., no electrical isolations between photovoltaic array and power grid.So that solar-electricity
Directly there is parasitic capacitance over the ground in pond and grounding shell, and this capacitor filter element can be exported with inverter and power grid hinders
Anti- composition common mode resonance circuit.Under the action of inverter HF switch, parasitic capacitance can generate leakage current, which can shadow
It rings the efficiency of photovoltaic generating system and generates electromagnetic interference.
The one kind of Cascade H bridge inverter as non-isolation type inverter, as shown in Figure 1, its leakage current virtual value is with mould
The increase of number of blocks and increase, when leakage current is larger (be greater than 300mA), inverter can be disconnected with power grid.
As it can be seen that the leakage current for how reducing non-isolated inverter is a current problem urgently to be resolved.
Summary of the invention
In view of this, can make described the present invention provides a kind of method for inhibiting cascaded multilevel inverter leakage current
The sum of voltage of parasitic capacitance of inversion unit is fixed value, reduces leakage current.
To achieve the above object, the present invention provides a kind of method for inhibiting cascaded multilevel inverter leakage current, applications
In at least one inversion unit, each inversion unit includes two cascade H bridge modules,
By controlling the switch motion in each H bridge module, make the parasitic capacitance of the inversion unit voltage it
With for fixed value.
Preferably, the switch motion in each H bridge module of the control includes:
Switch combination is obtained, making the sum of voltage of parasitic capacitance of the inversion unit is the direct current of the H bridge module
Press vdc, the switch combination are as follows:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combination: 1010-1000-1100-0011-0001-0101；
Third switch combination: 1010-1110-1100-0011-0111-0101；
4th switch combination: 1010-1000-1100-0011-0001-0101；
It controls the H bridge module and carries out switch motion according to the switch combination.
Preferably, two H bridge modules in each inversion unit are using the identical carrier wave stacking modulation of phase.
Preferably, the inversion unit is even number,
Two inversion units are an inversion group, the one of an inversion unit in each inversion group
One H bridge module of a H bridge module and another inversion unit shares first switch signal, described in another
Another described H bridge module of H bridge module and another inversion unit shares second switch signal.
Preferably, it is modulated between different inversion groups using phase-shifting carrier wave, level number and equivalent switching frequency is turned up.
Preferably, the inversion unit is odd number,
Two inversion units are an inversion group, the one of an inversion unit in each inversion group
One H bridge module of a H bridge module and another inversion unit shares third switching signal, described in another
Another described H bridge module of H bridge module and another inversion unit shares the 4th switching signal；
Another described inversion unit is another inversion group, and uses phase-shifting carrier wave tune between different inversions group
System.
A kind of cascaded multilevel inverter, including at least one inversion unit, each inversion unit include two grades
The H bridge module of connection,
The inverter makes the parasitism electricity of the inversion unit by controlling the switch motion in each H bridge module
The sum of voltage of appearance is fixed value.
It can be seen via above technical scheme that compared with prior art, the present invention provides a kind of inhibition cascade connection multi-levels
The method of inverter leakage current, this method are particularly suitable for the cascade system of even number H bridge module, and to odd number H bridge module
Cascade system also has certain inhibiting effect.By controlling the movement of each H bridge module switch, make all parasitic capacitor voltages
The sum of be steady state value.By the relationship of capacitance voltage and electric current it is found that theoretically leakage current should be 0, to effectively inhibit electric leakage
Stream meets standard of generating electricity by way of merging two or more grid systems.
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 circuit diagram of Cascade H bridge inverter in the prior art；
Fig. 2 is the common mode equivalent circuit figure of Cascade H bridge inverter；
Fig. 3 is a kind of structural schematic diagram of cascaded multilevel inverter disclosed in the embodiment of the present invention one；
Fig. 4 is the calculation formula schematic diagram of parasitic capacitor voltage disclosed in the embodiment of the present invention one；
Fig. 5 is the calculation formula schematic diagram of another parasitic capacitor voltage disclosed in the embodiment of the present invention one；
Fig. 6 is the module using the method distribution of another inhibition cascaded multilevel inverter leakage current provided by the invention
Schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention one provides a kind of method for inhibiting cascaded multilevel inverter leakage current, is applied at least one
A inversion unit, each inversion unit includes two cascade H bridge modules, by controlling in each H bridge module
Switch motion, making the sum of voltage of parasitic capacitance of the inversion unit is fixed value.
Inventor has found that grid power leakage stream is the sum of each stray capacitance currents during researching and developing this programme, false
The parasitic capacitance for determining modules is equal, then the change rate of the sum of the leakage current between photovoltaic panel and power grid and capacitance voltage is at just
Than.
Referring to Fig. 2, Fig. 2 is the common mode equivalent circuit figure of Cascade H bridge inverter, it is fixed according to Kirchoff s voltage electric current
Rule, the expression formula for obtaining common-mode voltage in each parasitic capacitance are as follows:
It can be seen that the difference that voltage value in parasitic capacitance is the common mode component of this module, other modules from the root of equation group
The sum of half and the half of network voltage of mould ingredient, wherein the module differential mode symbol above this module is positive,
Module differential mode symbol below this module is negative.
From aforesaid equation it is found that the common-mode voltage of each parasitic capacitance includes high-frequency PWM signal and power grid power frequency component.
Influence in view of power frequency component to leakage current is little, can ignore.So if can guarantee in each parasitic capacitor voltage
The sum of high frequency voltage (PWM voltage) remains unchanged, it will be able to inhibit grid power leakage stream well.Leakage current is inhibited to seek to tie up
It is constant to hold the sum of parasitic capacitor voltage.
In conjunction with table 1, table 1 be two modules switching sequence under output voltage and common-mode voltage relationship, it is as follows:
Table 1
From upper table the shape of switch combination can be adjusted so that switch has redundant state amount (such as ± Vdc, 0) it is found that certain level
State can make Vcpv1+Vcpv2 (i.e.) constant, to reduce and be
System leakage current.
In this embodiment, switch combination can also be obtained, so that the sum of the voltage of parasitic capacitance of the inversion unit is
The DC voltage v of the H bridge moduledc, the switch combination are as follows:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combination: 1010-1000-1100-0011-0001-0101；
Third switch combination: 1010-1110-1100-0011-0111-0101；
4th switch combination: 1010-1000-1100-0011-0001-0101；
Later, it controls the H bridge module and carries out switch motion according to the switch combination.Make the parasitism of the inversion unit
The sum of voltage of capacitor is fixed value.
Specifically, two H bridge modules in each inversion unit use improved phase phase in the present embodiment
Same carrier wave stacking modulation (i.e. MPD modulation).
Preferably, the inversion unit is even number, wherein two inversion units are an inversion group, each
In the inversion group described in one of one of inversion unit H bridge module and another inversion unit
H bridge module shares first switch signal, another described H bridge of another described H bridge module and another inversion unit
Module shares second switch signal.
On this basis, it is modulated between different inversion groups using phase-shifting carrier wave, and the carrier wave phase of every two inversion group
Position is on the contrary to be turned up level number and equivalent switching frequency.
Now in conjunction with Fig. 3, Fig. 3 is the combination block diagram of eight modules, is analyzed as follows:
Two modules form an inversion unit, and if module 1 and module 2 are inversion unit 1, module 3 and module 4 are inversion
Unit 2, module 5 and module 6 are inversion unit 3, and module 7 and module 8 are inversion unit 4.
Wherein, each inversion unit can guarantee the electricity of parasitic capacitance using the identical carrier wave stacking modulation of phase in this way
The sum of pressure is fixed value, i.e. the part of box is definite value in Fig. 4.
Two units form a group, and by taking group 1 as an example, the common switch signal of module 1 and 8, module 2 and 7 is shared and opened
OFF signal, it is ensured that the difference mode signal of generation is equal to each other, as shown in figure 4, box 1 is equal with the value in box 2, box 3
It is equal with the value in box 4, it can cancel out each other both in the sum of parasitic capacitor voltage each in this way.
And modulated between group and group using PS, using the modulation system, it can be improved equivalent switching frequency, simultaneously
Increase level number.
Except this, the present embodiment also further demonstrates modulation effect when inversion unit is odd number, it should be noted that
When the number of inversion unit is odd number, two inversion units are an inversion group, one in each inversion group
One H bridge module of the H bridge module of one of a inversion unit and another inversion unit shares third
Another described H bridge module of switching signal, another described H bridge module and another inversion unit shares the 4th switch
Signal；Another described inversion unit is another inversion group, and is modulated between different inversions group using phase-shifting carrier wave.
Specifically, being illustrated by taking 6 modules as an example:
Fig. 5 and Fig. 6 are please referred to, six modules are similar with the processing method of eight modules, are using two modules as one
A unit is modulated, and guarantees that the Blocked portion in Fig. 5 is fixed value.In addition, two inversion units are one group, module 1 and mould
6 common switch signal of block, the common switch signal of module 2 and 5, it is ensured that the difference mode signal of generation is equal to each other, i.e. side in Fig. 5
Frame 1 is equal with the value in box 2, and box 3 is equal with the value in box 4, can both in the sum of parasitic capacitor voltage each in this way
To cancel out each other.
Unlike eight modules groupings, six modules are needed module 3 and 4 independence of module in groups, as shown in fig. 6,
And it is modulated between group and group using PS, improves equivalent switching frequency, while increasing level number.
As it can be seen that the method provided by the invention for inhibiting cascaded multilevel inverter leakage current is suitable for the grade that number of modules is 2n
Join inverter.
In conclusion this method is especially the present invention provides a kind of method for inhibiting cascaded multilevel inverter leakage current
Also there is certain inhibiting effect suitable for the cascade system of even number H bridge module, and to the cascade system of odd number H bridge module.
By controlling the movement of each H bridge module switch, making the sum of all parasitic capacitor voltages is steady state value.By capacitance voltage and electric current
Relationship it is found that theoretically leakage current should be 0, to effectively inhibit leakage current, satisfaction is generated electricity by way of merging two or more grid systems standard.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of method for inhibiting cascaded multilevel inverter leakage current, which is characterized in that be applied to even number inversion unit, often
A inversion unit includes two cascade H bridge modules,
By controlling the switch motion in each H bridge module, the sum of the voltage of parasitic capacitance of the inversion unit is set to be
Fixed value；
Wherein, two inversion units are an inversion group, inversion unit in each inversion group
One H bridge module of one H bridge module and another inversion unit shares first switch signal, each described
Another described H bridge module of the H bridge module of another in inversion group and inversion unit described in another shares second and opens
OFF signal.
2. the method according to claim 1 for inhibiting cascaded multilevel inverter leakage current, which is characterized in that the control
Switch motion in each H bridge module includes:
Switch combination is obtained, making the sum of voltage of parasitic capacitance of the inversion unit is the DC voltage v of the H bridge moduledc,
The switch combination are as follows:
First switch combination: 1010-1110-1100-0011-0001-0101；
Second switch combination: 1010-1000-1100-0011-0001-0101；
Third switch combination: 1010-1110-1100-0011-0111-0101；
It controls the H bridge module and carries out switch motion according to the switch combination, wherein switching tube in the 1 characterization H bridge module
Conducting, 0 characterizes switching tube shutdown in the H bridge module, and there are four switching tube, first switch tubes for tool in 1010 characterization H bridge modules
Conducting, second switch shutdown, the conducting of third switching tube, the shutdown of the 4th switching tube, 1110 characterize tool in H bridge modules, and there are four open
Guan Guan, first switch tube conducting, second switch conducting, the conducting of third switching tube, the shutdown of the 4th switching tube, 1100 characterization H bridges
There are four switching tube, first switch tube conducting, second switch conducting, the shutdowns of third switching tube, the 4th switching tube for tool in module
Shutdown, 0011 characterizes tool in H bridge module, and there are four switching tube, first switch tube shutdowns, second switch shutdown, third switching tube
Conducting, the conducting of the 4th switching tube, 0001 characterizes tool in H bridge module, and there are four switching tube, first switch tube shutdowns, second switch
Shutdown, the shutdown of third switching tube, the conducting of the 4th switching tube, 0101 characterizes tool in H bridge module, and there are four switching tube, first switch tubes
Shutdown, second switch conducting, the shutdown of third switching tube, the conducting of the 4th switching tube, 1000 characterize tool in H bridge modules, and there are four open
Guan Guan, first switch tube conducting, second switch shutdown, the shutdown of third switching tube, the shutdown of the 4th switching tube, 0111 characterization H bridge
There are four switching tube, first switch tube shutdown, second switch conducting, the conductings of third switching tube, the 4th switching tube for tool in module
Conducting.
3. the method according to claim 2 for inhibiting cascaded multilevel inverter leakage current, which is characterized in that
Two H bridge modules in each inversion unit are using the identical carrier wave stacking modulation of phase.
4. the method according to claim 1 for inhibiting cascaded multilevel inverter leakage current, which is characterized in that
It is modulated between different inversion groups using phase-shifting carrier wave, level number and equivalent switching frequency is turned up.
5. a kind of method for inhibiting cascaded multilevel inverter leakage current, which is characterized in that applied to three or more odd numbers
Inversion unit, each inversion unit include two cascade H bridge modules,
By controlling the switch motion in each H bridge module, the sum of the voltage of parasitic capacitance of the inversion unit is set to be
Fixed value；
Wherein, two inversion units are an inversion group, inversion unit in each inversion group
One H bridge module of one H bridge module and another inversion unit shares third switching signal, each described
Another described H bridge module of the H bridge module of another in inversion group and inversion unit described in another shares the 4th and opens
OFF signal；
The inversion unit in the inversion group is not another inversion group, and using load between different inversions group
Wave phase shift modulation.
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| 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 |
| 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 |
| CN107508316B (en) * | 2017-08-24 | 2019-04-16 | 山东大学 | Dual-layer optimization global synchronization variable duration impulse system and method |
| CN112165269B (en) * | 2020-09-18 | 2022-03-25 | 浙江大学 | Control method of single-phase cascaded full-bridge multi-level converter and multi-level converter |
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| JP2008178158A (en) * | 2007-01-16 | 2008-07-31 | Mitsubishi Electric Corp | Power converter |
| CN104538987A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Control method and system for parallel connection of alternating current sides of photovoltaic inverters |
| 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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| ES2402462B1 (en) * | 2010-11-08 | 2014-03-28 | Ingeteam Technology, S.A | Control method for energy conversion, and electronic power converter adapted to carry out said method |
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| JP2008178158A (en) * | 2007-01-16 | 2008-07-31 | Mitsubishi Electric Corp | Power converter |
| 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 |
| CN104538987A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Control method and system for parallel connection of alternating current sides of photovoltaic inverters |
| 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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