CN104638891B - A kind of common-mode voltage suppression system for photovoltaic combining inverter - Google Patents
A kind of common-mode voltage suppression system for photovoltaic combining inverter Download PDFInfo
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- CN104638891B CN104638891B CN201510082476.9A CN201510082476A CN104638891B CN 104638891 B CN104638891 B CN 104638891B CN 201510082476 A CN201510082476 A CN 201510082476A CN 104638891 B CN104638891 B CN 104638891B
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- common
- mode
- inductance
- common mode
- filtering
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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
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- H02M1/123—Suppression of common mode voltage or current
-
- 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 discloses a kind of common-mode voltage suppression system for photovoltaic combining inverter, the system seals in common mode filtering inductance with retracting in differential mode filter inductance on the capacitor loop of bus midpoint, the common mode filtering inductance is enhanced common mode filtering unit, the magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current does not interfere with the inductance value of this common mode filtering unit.Influence of fading present invention decreases strong common-mode voltage to differential mode inductance, reduce the filtering pressure of the common common mode inductance of rear class, the common-mode voltage of the overwhelming majority is all dropped on the second common mode filtering inductance, strong common-mode voltage is suppressed with inexpensive cost, influence of the common-mode voltage to grid side is effectively reduced, optimizes complete machine EMC present situations.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of common-mode voltage for photovoltaic combining inverter to press down
System processed.
Background technology
Photovoltaic combining inverter is a kind of TRT that photovoltaic panel direct current energy is converted into AC energy.Solar energy is made
For the important member in new energy troop, this is cleaned by the extensive concern of countries in the world, distributed photovoltaic power generation in recent years
The energy brings huge numbers of families into, allows everyone to enjoy the facility that green energy resource is brought to life.Distributed photovoltaic inverter
Grid-connect mode often selects the low voltage electric network that inverter is directly incorporated into terminal user, and has load equipment species on low voltage electric network
It is various, antijamming capability is uneven, to the quality of power supply require it is high the features such as.This requires the inversion for being directly incorporated into low voltage electric network
Utensil has good electromagnetic compatibility (EMC).Because the DC side of photovoltaic combining inverter belongs to suspension relative to the earth (PE)
State, when inverter is during HF switch, the voltage at its bridge arm midpoint is that busbar voltage adds to the voltage between the earth
The now instantaneous value of line voltage, and this common-mode voltage can be formed altogether by the Y capacitance over the ground in other equipment on low voltage electric network
Mould loop, so as to influence the normal operation of other equipment.
At present, the suppression for above-mentioned common-mode voltage mainly has following two modes：First, as shown in figure 1, being filtered using common mode
Ripple inductance suppression common mode voltage；2nd, as shown in Fig. 2 common mode filtering inductance and the common suppression common mode voltage of differential mode filter inductance.With
Upper two ways can suppress common-mode voltage caused by inverter to a certain extent, but have deficiency.For mode one, due to
The complete machine topology mentioned before is limited, and the common-mode voltage of AC converter output over the ground is：UCV=UBUS+UOUT* sinwt, wherein：
UCVFor the common-mode voltage of AC converter output, UBUSFor busbar voltage, UOUTTo export phase voltage, wt is the output phase of t
Voltage-phase.Magnetic core of the output common mode inductance typically from material for manganese-zinc ferrite in mode one, and conventional manganese-zinc ferrite
The saturation magnetic induction of body is only 0.4T, under so big common-mode voltage effect, is not only formed with the Y capacitance of inverter internal larger
Electric current, also common mode current can be formed with the Y capacitance in terminal low voltage electric network load equipment, easily allow common mode inductance that saturation occurs.
Differential mode filter inductance is make use of in mode two and retracts the electric capacity cooperation at bus capacitor midpoint, common-mode voltage is suppressed to filter in differential mode
On ripple inductance, the problem of common mode current flows to terminal power grid is so can effectively solve the problem that, but for being directly incorporated into terminal low pressure
For the group string inverter of power network, consider that switching frequency is all higher, the difference of selection for factors such as overall volume, efficiency
Mould filter inductance magnetic core material is generally the preferable magnetic material of the high frequency characteristicses such as iron silicon, iron sial, amorphous, this magnetic material high frequency electric
Under loss it is low, but attenuation ratio of the inductance value under the function of current is more serious, if common-mode voltage all filtered by differential mode
Inductance undertakes, and certainly will further reduce inductance value, influences differential mode filter effect, and then influence complete machine output-index.
The content of the invention
It is an object of the invention to by a kind of common-mode voltage suppression system for photovoltaic combining inverter, come solve with
The problem of upper background section is mentioned.
To use following technical scheme up to this purpose, the present invention：
A kind of common-mode voltage suppression system for photovoltaic combining inverter, it includes differential mode filter inductance, retracts bus
Midpoint electric capacity, the first common mode filtering inductance, common mode filtering Y capacitance and the second common mode filtering inductance；Wherein, the differential mode filtering
Inductance, the first common mode filtering inductance, common mode filtering Y capacitance are sequentially connected in series, and the second common mode filtering inductance seals in be filtered in differential mode
Ripple inductance is with retracting on the capacitor loop of bus midpoint.
Especially, the common-mode voltage U on the differential mode filter inductanceCV1, common-mode voltage on the second common mode filtering inductance
UCV2, common-mode voltage U on the first common mode filtering inductanceCV3Meet：UCV2>UCV1>UCV3；It is described to retract bus midpoint capacitor loop
Common mode current ICV1, common mode filtering Y capacitance loop common mode current ICV2And the common mode current I in grid side Y capacitance loopCV3
Meet：ICV1>ICV2>ICV3。
Especially, the second common mode filtering inductance use but be not limited to iron silicon, iron sial, non-crystalline material it is any.
Common-mode voltage suppression system proposed by the present invention for photovoltaic combining inverter is in differential mode filter inductance with retracting
The second common mode filtering inductance is sealed on the capacitor loop of bus midpoint, the common mode filtering inductance is enhanced common mode filtering unit,
The magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current does not interfere with the inductance value of this common mode filtering unit.This
Invention reduces influence of fading of the strong common-mode voltage to differential mode inductance, reduces the common common mode inductance of rear class i.e. the first common mode filtering
The filtering pressure of inductance, most common-mode voltages are all dropped on the second common mode filtering inductance, are suppressed with inexpensive cost
Strong common-mode voltage, influence of the common-mode voltage to grid side is effectively reduced, optimize complete machine EMC present situations.
Brief description of the drawings
Fig. 1 is the system construction drawing using common mode filtering inductance suppression common mode voltage；
Fig. 2 is the system construction drawing using common mode filtering inductance and the common suppression common mode voltage of differential mode filter inductance；
Fig. 3 is the structure chart for the common-mode voltage suppression system that the present invention is used for photovoltaic combining inverter；
Fig. 4 is common-mode voltage U in the present inventionCV2、UCV1、UCV3, common mode current ICV1、ICV2、ICV3Distribution map.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein
Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that for the ease of retouching
State, part related to the present invention rather than full content are illustrate only in accompanying drawing, it is unless otherwise defined, used herein all
Technology and scientific terminology are identical with belonging to the implication that the those skilled in the art of the present invention are generally understood that.It is used herein
Term be intended merely to describe specific embodiment, it is not intended that in limitation the present invention.
It refer to shown in Fig. 3, Fig. 3 is the structure for the common-mode voltage suppression system that the present invention is used for photovoltaic combining inverter
Figure.
Common-mode voltage suppression system in the present embodiment for photovoltaic combining inverter specifically includes differential mode filter inductance
301st, bus midpoint electric capacity 302, the first common mode filtering inductance 303, the common mode filtering of common mode filtering Y capacitance 304 and second are retracted
Inductance 305.The differential mode filter inductance 301, the first common mode filtering inductance 303, common mode filtering Y capacitance 304 are sequentially connected in series.It is described
Second common mode filtering inductance 305 is sealed in differential mode filter inductance 301 and retracted on the loop of bus midpoint electric capacity 302.
The second common mode filtering inductance 305 described in the present embodiment uses but is not limited to iron silicon, iron sial, non-crystalline material
It is any.During work, the magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current does not interfere with the filter of the second common mode
The inductance value of ripple inductance 305.Influence of fading present invention decreases strong common-mode voltage to differential mode inductance, reduce the common common mode of rear class
Inductance is the filtering pressure of the first common mode filtering inductance 303, and most common-mode voltages all drops to the second common mode filtering electricity
In sense 305.As shown in figure 4, Fig. 4 is common-mode voltage U in the present inventionCV2、UCV1、UCV3, common mode current ICV1、ICV2、ICV3Distribution
Figure, by rational inductor design, can make the common-mode voltage U on the differential mode filter inductance 301CV1, the second common mode filtering inductance
Common-mode voltage U on 305CV2, common-mode voltage U on the first common mode filtering inductance 303CV3Meet：UCV2>UCV1->UCV3.Pass through conjunction
The capacitor's capacity type selecting of reason, the common mode current I for retracting the loop of bus midpoint electric capacity 302 can be madeCV1, common mode filtering Y capacitance
The common mode current I in 304 loopsCV2And the common mode current I in the loop of grid side Y capacitance 306CV3Meet：ICV1>ICV2>ICV3。
It should be noted that technical scheme can be applied in photovoltaic combining inverter, can also apply
In other high common mode out-put supply systems；The outlet side in AC power can be applied, can also should be in the input of AC power
Side.
Technical scheme seals in the filter of the second common mode in differential mode filter inductance with retracting on the capacitor loop of bus midpoint
Ripple inductance, the common mode filtering inductance are enhanced common mode filtering unit, and the magnetic flux that differential-mode current is formed in magnetic core mutually supports
Disappear, therefore differential-mode current does not interfere with the inductance value of this common mode filtering unit.Present invention decreases strong common-mode voltage to differential mode inductance
Influence of fading, reduces the filtering pressure of the first common mode filtering inductance, and most common-mode voltages all drops to the second common mode
On filter inductance, strong common-mode voltage is suppressed with inexpensive cost, influence of the common-mode voltage to grid side is effectively reduced, optimizes whole
Machine EMC present situations.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (2)
1. a kind of common-mode voltage suppression system for photovoltaic combining inverter, it is characterised in that including differential mode filter inductance, draw
Return bus midpoint electric capacity, the first common mode filtering inductance, common mode filtering Y capacitance and the second common mode filtering inductance；Wherein, the difference
Mould filter inductance, the first common mode filtering inductance, common mode filtering Y capacitance are sequentially connected in series, and the second common mode filtering inductance seals in
Differential mode filter inductance is with retracting on the capacitor loop of bus midpoint；Common-mode voltage U on the differential mode filter inductanceCV1, the second common mode
Common-mode voltage U on filter inductanceCV2, common-mode voltage U on the first common mode filtering inductanceCV3Meet：UCV2>UCV1>UCV3；It is described
Retract the common mode current I of bus midpoint capacitor loopCV1, common mode filtering Y capacitance loop common mode current ICV2And grid side Y electricity
Hold the common mode current I in loopCV3Meet：ICV1>ICV2>ICV3。
2. the common-mode voltage suppression system according to claim 1 for photovoltaic combining inverter, it is characterised in that described
Second common mode filtering inductance using iron silicon, iron sial, non-crystalline material it is any.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510082476.9A CN104638891B (en) | 2015-02-15 | 2015-02-15 | A kind of common-mode voltage suppression system for photovoltaic combining inverter |
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| CN201510082476.9A CN104638891B (en) | 2015-02-15 | 2015-02-15 | A kind of common-mode voltage suppression system for photovoltaic combining inverter |
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| CN104638891A CN104638891A (en) | 2015-05-20 |
| CN104638891B true CN104638891B (en) | 2018-02-13 |
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Families Citing this family (7)
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| CN107492905B (en) * | 2017-08-22 | 2020-09-29 | 上能电气股份有限公司 | Alternating current common mode voltage adjusting device and photovoltaic system applying same |
| CN108039815B (en) * | 2017-12-15 | 2020-02-07 | 西安许继电力电子技术有限公司 | Electromagnetic interference suppression circuit and operation method thereof |
| WO2020061905A1 (en) * | 2018-09-27 | 2020-04-02 | Abb Schweiz Ag | Apparatus for conversion between ac power and dc power |
| CN109412499A (en) * | 2018-12-19 | 2019-03-01 | 南京埃斯顿自动化股份有限公司 | A kind of servo-driver common mode noise rejection circuit |
| US11177660B2 (en) | 2020-01-27 | 2021-11-16 | Mitsubishi Electric Power Products, Inc. | System and method for power converter control for virtual impedance |
| CN113381596A (en) * | 2020-03-09 | 2021-09-10 | 株洲中车奇宏散热技术有限公司 | Method for reducing overvoltage of wind power generator side filter |
| CN117476402B (en) * | 2023-12-28 | 2024-03-12 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
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| CN104201920A (en) * | 2014-09-19 | 2014-12-10 | 阳光电源股份有限公司 | Common mode circuit, three-phase inverter and photovoltaic power generation system |
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| US7876561B2 (en) * | 2007-01-22 | 2011-01-25 | Johnson Controls Technology Company | Cooling systems for variable speed drives and inductors |
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Patent Citations (2)
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| CN201541382U (en) * | 2009-03-26 | 2010-08-04 | 沈建兴 | High-frequency generator of electrodeless magnetic energy lamp |
| CN104201920A (en) * | 2014-09-19 | 2014-12-10 | 阳光电源股份有限公司 | Common mode circuit, three-phase inverter and photovoltaic power generation system |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
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