CN105932896A - Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof - Google Patents
Photovoltaic grid-connected inverter with common-mode current suppression and suppression method thereof Download PDFInfo
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- CN105932896A CN105932896A CN201610367965.3A CN201610367965A CN105932896A CN 105932896 A CN105932896 A CN 105932896A CN 201610367965 A CN201610367965 A CN 201610367965A CN 105932896 A CN105932896 A CN 105932896A
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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
- H02M7/53—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a common-mode current suppression inverter, comprising a solar polar panel PV, wherein one output end of the solar polar panel PV is sequentially connected with one end of a capacitor C2 and the first end of a differential-mode and common-mode inductor L1, the other output end of the solar polar panel PV is sequentially connected with one end of a capacitor C1, one end of the capacitor C3 and the second end of the differential-mode and common-mode inductor L1, and the first end of the differential-mode and common-mode inductor and the second end of the differential-mode and common-mode inductor are dotted terminals. C1 is the solar polar panel; C4 is connected with the midpoint of the grounding parasitic capacitors C2 and C3; L1 is the integrated differential-mode and common-mode inductor; L2, IG1 and D1 constitute a boosted circuit; CD is the bus filter capacitor, C7 is connected with the midpoint of C5 and C6; IG2 to IG5 constitute a full bridge inverter circuit; L3, C8 and C9 constitute a differential-mode filter circuit;L3 is the integrated differential-mode and common-mode inductor, and L5 is the common-mode inductor.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter with common mode current suppression and suppressing method thereof, belong to photovoltaic generation energy field.
Background technology
Non-isolated photovoltaic grid-connected inverter structure does not contains transformator, has conversion efficiency high, and volume is little, lightweight, the absolute advantages of low cost, but, the disappearance of transformator makes solar energy pole plate and electrical network have electrical connection, and common mode current increases considerably, it is possible to bring safety problem.So, how to reduce common mode current, one of study hotspot becoming photovoltaic combining inverter.
The minimum limited by common-mode voltage is made every effort in the appearance of a series of control algolithms, and nonetheless, common mode current also is difficult to control below the mark.
Summary of the invention
According to the present invention, on the basis of reducing common-mode voltage as far as possible, add common mode filtering circuit, thus common mode current is strict controlled in below the mark.
According to one embodiment of the invention, provide a kind of photovoltaic combining inverter with common mode current suppression, this inverter includes: solar energy pole plate PV, one outfan of solar energy pole plate PV be linked in sequence electric capacity C2 one end and difference common mode inductance L1 the first end, another outfan of solar energy pole plate PV be linked in sequence one end of electric capacity C1, one end of electric capacity C3 and difference common mode inductance L1 the second end, the first end of wherein said poor common mode inductance and the second end of described poor common mode inductance are Same Name of Ends.The midpoint of electric capacity C2 and electric capacity C3 connects electric capacity C4.One end of three-terminal link inductance L2 of difference common mode inductance L1, the 4th end of difference common mode inductance L1 is linked in sequence the emitter stage of insulated gate bipolar transistor IG1, one end of electric capacity Cd, one end of electric capacity C6, the emitter stage of insulated gate bipolar transistor IG4 and the emitter stage of insulated gate bipolar transistor IG5.The other end of inductance L2 is connected to anode and the colelctor electrode of insulated gate bipolar transistor IG1 of diode D1, and the other end of electric capacity C1 is connected to the first earth terminal and the second earth terminal.The negative electrode of diode D1 is serially connected to the other end of electric capacity Cd, one end of electric capacity C5, insulated gate bipolar transistor IG2 colelctor electrode and the colelctor electrode of insulated gate bipolar transistor IG3.The other end of electric capacity C5 is connected to the other end and one end of electric capacity C7 of electric capacity C6.nullThe emitter stage of insulated gate bipolar transistor IG2 connects the colelctor electrode of insulated gate bipolar transistor IG4，The emitter stage of insulated gate bipolar transistor IG3 connects the colelctor electrode of insulated gate bipolar transistor IG5，The midpoint of insulated gate bipolar transistor IG2 and insulated gate bipolar transistor IG4 is connected to first end of difference common mode inductance L3，The midpoint of insulated gate bipolar transistor IG3 and insulated gate bipolar transistor IG5 is connected to second end of difference common mode inductance L3，Difference common mode inductance L3 three-terminal link to electric capacity C8 one end and differ from common mode inductance L5 the first end，4th end of difference common mode inductance L3 is connected to one end and second end of difference common mode inductance L5 of electric capacity C9，First end and the 4th end of the poorest common mode inductance L3 are Same Name of Ends，The three-terminal link of difference common mode inductance L5 is to electrical network one end，4th end of difference common mode inductance L5 is connected to the other end and second earth terminal of electrical network，First end and second end of difference common mode inductance L5 are Same Name of Ends.The other end of electric capacity C4 is serially connected to the other end of electric capacity C7, the other end of electric capacity C8 and the other end of electric capacity C9.
According to one embodiment of present invention, described poor common mode inductance L1 is identical with difference common mode inductance L5, and newel opens air gap, and wherein the width of air gap is configured according to required inductance value, and the inductance value of air gap is inversely proportional to required differential mode inductance amount.
According to one embodiment of present invention, the air gap of described poor common mode inductance L3 is opened on the side post of both sides.
According to one embodiment of present invention, air gap on the side post of described left side and the air gap on the side post of right side the most each include upper and lower two air gaps, wherein go up air gap to form by two relative right angled triangles with lower air gap, two right angles of two right angled triangles wherein going up air gap are above and be positioned at both sides and be oppositely arranged, the core tip that two right angled triangles are surrounded is upwards, two right angles wherein descending two right angled triangles of air gap are positioned at lower section and are positioned at both sides and are oppositely arranged, and the core tip that two right angled triangles are surrounded is downward.
According to one embodiment of present invention, assume that the core length by the coil of described left and right sides side column is wound around carries out 5 deciles, wherein being spaced apart between upper air gap and the lower air gap on left side and right side side post described 5 etc. divides the twice of a decile distance, a decile distance but the upper air gap of the upper air gap of left side side post and right side side post in height staggers in distance.
According to one embodiment of present invention, in described each upper and lower air gap, the length of right angled triangle right-angle side in the height direction meets following condition:
The length of right angled triangle right-angle side in the height direction, μ during wherein x represents upper and lower air gap0Representing permeability of vacuum, N represents the number of turn of coil on left side or right side side post, and Ae represents the sectional area of side post, and L represents inductance value required during maximum current, and this inductance value is determined by ripple limit value during maximum output current.
According to one embodiment of present invention, the width of the newel of described poor common mode inductance L3 is much smaller than the width of left and right sides side post, described much smaller than referring to differ an order of magnitude.
According to one embodiment of the invention, it is provided that a kind of method using above-mentioned inverter to carry out common mode current suppression.
Accompanying drawing explanation
Accompanying drawing 1It it is the signal of the photovoltaic combining inverter with common mode current suppression function of the present inventionFigure；
Accompanying drawing 2It it is the structure of integrally inductance L1 and L5 of the poor common mode in inverter of the present inventionFigure；
Accompanying drawing 3It it is the structure of difference common mode one inductance L3 in inverter of the present inventionFigure；
Accompanying drawing 4It it is the shape of the upper air gap used in difference common mode one inductance L3 in the present invention；
Accompanying drawing 5It it is the shape of the lower air gap used in difference common mode one inductance L3 in the present invention.
Detailed description of the invention
To combine belowAccompanying drawingOn the basis of describe the photovoltaic combining inverter with common mode current suppression function of the present invention and suppressing method thereof in detail:
This photovoltaic combining inverter with common mode current suppression function includes: solar energy pole plate PV, one outfan of solar energy pole plate PV be linked in sequence electric capacity C2 one end and difference common mode inductance L1 the first end, another outfan of solar energy pole plate PV be linked in sequence one end of electric capacity C1, one end of electric capacity C3 and difference common mode inductance L1 the second end, the first end of wherein said poor common mode inductance and the second end of described poor common mode inductance are Same Name of Ends.The midpoint of electric capacity C2 and electric capacity C3 connects electric capacity C4.One end of three-terminal link inductance L2 of difference common mode inductance L1, the 4th end of difference common mode inductance L1 is linked in sequence the emitter stage of insulated gate bipolar transistor IG1, one end of electric capacity Cd, one end of electric capacity C6, the emitter stage of insulated gate bipolar transistor IG4 and the emitter stage of insulated gate bipolar transistor IG5.The other end of inductance L2 is connected to anode and the colelctor electrode of insulated gate bipolar transistor IG1 of diode D1, and the other end of electric capacity C1 is connected to the first earth terminal and the second earth terminal.The negative electrode of diode D1 is serially connected to the other end of electric capacity Cd, one end of electric capacity C5, insulated gate bipolar transistor IG2 colelctor electrode and the colelctor electrode of insulated gate bipolar transistor IG3.The other end of electric capacity C5 is connected to the other end and one end of electric capacity C7 of electric capacity C6.nullThe emitter stage of insulated gate bipolar transistor IG2 connects the colelctor electrode of insulated gate bipolar transistor IG4，The emitter stage of insulated gate bipolar transistor IG3 connects the colelctor electrode of insulated gate bipolar transistor IG5，The midpoint of insulated gate bipolar transistor IG2 and insulated gate bipolar transistor IG4 is connected to first end of difference common mode inductance L3，The midpoint of insulated gate bipolar transistor IG3 and insulated gate bipolar transistor IG5 is connected to second end of difference common mode inductance L3，Difference common mode inductance L3 three-terminal link to electric capacity C8 one end and differ from common mode inductance L5 the first end，4th end of difference common mode inductance L3 is connected to one end and second end of difference common mode inductance L5 of electric capacity C9，First end and the 4th end of the poorest common mode inductance L3 are Same Name of Ends，The three-terminal link of difference common mode inductance L5 is to electrical network one end，4th end of difference common mode inductance L5 is connected to the other end and second earth terminal of electrical network，First end and second end of difference common mode inductance L5 are Same Name of Ends.The other end of electric capacity C4 is serially connected to the other end of electric capacity C7, the other end of electric capacity C8 and the other end of electric capacity C9.
Wherein PV is solar energy pole plate, and C1 is solar energy pole plate, over the ground parasitic capacitance, C2, the midpoint of C3 connects C4, L1 for difference common mode inductance, L2, IG1, D1 form BOST booster circuit, and Cd is bus DC filter capacitor, the midpoint of C5, C6 connects C7, IG2-IG5 and forms full bridge inverter, L3, C8, C9 form differential mode filter circuit, L3 is difference common mode inductance, and L5 is difference common mode inductance, and wherein L1 with L5 is identical.
Wherein,Figure 2Show the structure of poor common mode one inductance L1 and L5Figure, illustrated therein is 1 and 2 for Same Name of Ends.Solid line represents the direction in common mode current magnetic field, and dotted line represents the direction in differential-mode current magnetic field, and wherein newel opens air gap, and wherein the width of air gap is configured according to required inductance value, and the inductance value of air gap is inversely proportional to required differential mode inductance amount.
Figure 3Show the structure of poor common mode one inductance L3Figure, illustrated therein is the Same Name of Ends of 3.2 and 3.3 expression coils.?Figure 3Middle dotted arrow represents common mode current magnetic direction, and solid arrow represents differential-mode current magnetic direction.Hatched example areas represents magnetic core distributed areas, does not has the white space of oblique line to represent air gap.Coil is carried out 5 deciles by dotted line therein in the longitudinal direction.Air gap therein is opened on the side post of both sides, the air gap on side post on the left of 3.6 expressions, the air gap on side post on the right side of 3.5 expressions.Air gap on the most each side post includes upper and lower two air gaps, whereinFigure 4Show the shape of air gap,Figure 5Show the shape of lower air gap, namely upper air gap forms by two relative right angled triangles with lower air gap, two right angles of two right angled triangles wherein going up air gap are above and be positioned at both sides and be oppositely arranged, the core tip that two right angled triangles are surrounded is upwards, two right angles wherein descending two right angled triangles of air gap are positioned at lower section and are positioned at both sides and are oppositely arranged, and the core tip that two right angled triangles are surrounded is downward.Wherein being spaced apart between upper air gap and the lower air gap on left side and right side side post described 5 etc. divides the twice of a decile distance, a decile distance but the upper air gap of the upper air gap of left side side post and right side side post in height staggers in distance.And the length of right angled triangle right-angle side in the height direction meets following condition in each upper and lower air gap:
The length of right angled triangle right-angle side in the height direction, μ during wherein x represents upper and lower air gap0Representing permeability of vacuum, N represents the number of turn of coil on left side or right side side post, and Ae represents the sectional area of side post, and L represents inductance value required during maximum current, and this inductance value is determined by ripple limit value during maximum output current.
The common mode component of C2-C4, L1, C5-C7, L3, C8, C9 collectively form common mode current suppression loop.The common mode current flowing through ground wire is bypassed, can be by drain current limit below standard value.
Thus, according to the control circuit of the present invention, common mode current in prior art can be solved and be difficult to be suppressed to a difficult problem for below standard value.Well achieve the technique effect of low common mode current.This have the technical effect that by the present invention circuit structure entirety determine, owing to employing the poor common mode inductance of present invention original creation, the leakage field produced at air gap during normal work is little to the eddy current effect of coiling, because magnetic field can be strapped in magnetic core, air gap therein have employed segmentation offset pattern, and leakage field is little.Triangle air gap electric current hour inductance is big, and when electric current is big, inductance is little, can produce progressively saturation effect.During due to photovoltaic generation, facing various weather, such as cloudy day and rain, full load is not many, and underloading is few, so, such circuit structure, when being in the underloading of majority, current ripples can be made little.
Claims (3)
1. a photovoltaic combining inverter with common mode current suppression function, it is characterised in that: including: too
Sun can the outfan of pole plate PV, solar energy pole plate PV be linked in sequence the one of electric capacity C2
End and first end of difference common mode inductance L1, another outfan order of solar energy pole plate PV
Connect one end of electric capacity C1, one end of electric capacity C3 and second end of difference common mode inductance L1,
First end of wherein said poor common mode inductance L1 and second end of described poor common mode inductance L1 are
Same Name of Ends；The midpoint of electric capacity C2 and electric capacity C3 connects electric capacity C4；Difference common mode inductance L1's
One end of three-terminal link inductance L2, the 4th end of difference common mode inductance L1 is linked in sequence insulation
The emitter stage of grid bipolar transistor IG1, one end of bus DC capacitor Cd, electric capacity C6
One end, the emitter stage of insulated gate bipolar transistor IG4 and insulated gate bipolar crystal
The emitter stage of pipe IG5；The other end of inductance L2 is connected to anode and the insulation of diode D1
The colelctor electrode of grid bipolar transistor IG1, the other end of electric capacity C1 is connected to the first ground connection
End and the second earth terminal；The negative electrode of diode D1 is serially connected to bus DC filter capacitor
The other end of Cd, one end of electric capacity C5, insulated gate bipolar transistor IG2 colelctor electrode and
The colelctor electrode of insulated gate bipolar transistor IG3；The other end of electric capacity C5 is connected to electric capacity
The other end of C6 and one end of electric capacity C7；The emitter stage of insulated gate bipolar transistor IG2
Connect the colelctor electrode of insulated gate bipolar transistor IG4, insulated gate bipolar transistor IG3
Emitter stage connect the colelctor electrode of insulated gate bipolar transistor IG5, insulated gate bipolar is brilliant
The midpoint of body pipe IG2 and insulated gate bipolar transistor IG4 is connected to difference common mode inductance L3
The first end, insulated gate bipolar transistor IG3's and insulated gate bipolar transistor IG5
Midpoint is connected to second end of difference common mode inductance L3, the three-terminal link of difference common mode inductance L3
To one end and first end of difference common mode inductance L5 of electric capacity C8, the of difference common mode inductance L3
Four ends are connected to one end and second end of difference common mode inductance L5, the poorest common mode of electric capacity C9
First end and the 4th end of inductance L3 are Same Name of Ends, the three-terminal link of difference common mode inductance L5
To electrical network one end, the 4th end of difference common mode inductance L5 is connected to the other end and second of electrical network and connects
Ground end, the first end and second end of difference common mode inductance L5 are Same Name of Ends；Another of electric capacity C4
End is serially connected to the other end of electric capacity C7, the other end of electric capacity C8 and electric capacity C9
The other end, the air gap of described poor common mode inductance L3 is opened on the side post of both sides, described left side
Air gap on side post and the air gap on the side post of right side the most each include upper and lower two air gaps,
Wherein go up air gap to be formed by two relative right angled triangles with lower air gap, wherein go up air gap
Two right angles of two right angled triangles above and be positioned at both sides and be oppositely arranged, two
The core tip that right angled triangle is surrounded upwards, wherein descends two right angled triangles of air gap
Two right angles be positioned at lower section and be positioned at both sides and be oppositely arranged, two right angled triangles are surrounded
Core tip downward, it is assumed that the core length that the coil of described left and right sides side column is wound around is entered
Row 5 decile, wherein left side and right side side post on upper air gap and lower air gap between interval
The twice of a decile distance in distance is divided for described 5 grades, but the upper gas of left side side post
The upper air gap of gap and right side side post in height staggers a decile distance, described each upper,
In lower air gap, the length of right angled triangle right-angle side in the height direction meets following bar
Part:
The length of right angled triangle right-angle side in the height direction, μ during wherein x represents upper and lower air gap0Table
Showing that permeability of vacuum, N represent the number of turn of coil on left side or right side side post, Ae represents the cross section of side post
Long-pending, L represents inductance value required during maximum current, and this inductance value is by ripple limit value during maximum output current certainly
Fixed.
The photovoltaic combining inverter with common mode current suppression function the most according to claim 1, wherein
The width of the newel of described poor common mode inductance L3 is much smaller than the width of left and right sides side post,
Described much smaller than referring to differ an order of magnitude.
3. the photovoltaic grid-connected inversion with common mode current suppression function applied described in claim 1 or 2
Device carries out the method that common mode current carries out suppressing.
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| CN108075625A (en) * | 2016-11-15 | 2018-05-25 | Abb瑞士股份公司 | Multi-channel inverter for photovoltaic equipment |
| WO2019115207A1 (en) * | 2017-12-13 | 2019-06-20 | Robert Bosch Gmbh | Common-mode/differential-mode throttle for an electrically driveable motor vehicle |
| CN110535365A (en) * | 2019-08-30 | 2019-12-03 | 合肥工业大学 | Three-phase common mode current cooperates with the inversion system inhibited with switching loss |
| CN111245209A (en) * | 2020-01-19 | 2020-06-05 | 珠海格力电器股份有限公司 | Interference signal suppression circuit and electrical equipment |
| CN111313658A (en) * | 2020-03-25 | 2020-06-19 | 广州华凌制冷设备有限公司 | Drive control module and vehicle-mounted air conditioner |
| CN111313685A (en) * | 2020-03-25 | 2020-06-19 | 广州华凌制冷设备有限公司 | Drive control module and vehicle-mounted air conditioner |
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| CN108075625A (en) * | 2016-11-15 | 2018-05-25 | Abb瑞士股份公司 | Multi-channel inverter for photovoltaic equipment |
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| CN111245209A (en) * | 2020-01-19 | 2020-06-05 | 珠海格力电器股份有限公司 | Interference signal suppression circuit and electrical equipment |
| CN111313658A (en) * | 2020-03-25 | 2020-06-19 | 广州华凌制冷设备有限公司 | Drive control module and vehicle-mounted air conditioner |
| CN111313685A (en) * | 2020-03-25 | 2020-06-19 | 广州华凌制冷设备有限公司 | Drive control module and vehicle-mounted air conditioner |
| CN111313685B (en) * | 2020-03-25 | 2021-10-08 | 广州华凌制冷设备有限公司 | Drive control module and vehicle-mounted air conditioner |
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Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Patentee after: North China Electric Power University (Baoding) Address before: 215163 No. 189, Kunlunshan Road, Suzhou high tech Zone, Jiangsu Province (in science and technology city) Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. Patentee before: North China Electric Power University (Baoding) |
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