CN104638891A - Common-mode voltage suppression system for photovoltaic grid-connected inverter - Google Patents
Common-mode voltage suppression system for photovoltaic grid-connected inverter Download PDFInfo
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- CN104638891A CN104638891A CN201510082476.9A CN201510082476A CN104638891A CN 104638891 A CN104638891 A CN 104638891A CN 201510082476 A CN201510082476 A CN 201510082476A CN 104638891 A CN104638891 A CN 104638891A
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- common
- mode
- inductance
- voltage
- mode voltage
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Classifications
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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 invention discloses a common-mode voltage suppression system for a photovoltaic grid-connected inverter. According to the system, a common-mode filter inductor is in series connected to a capacitance loop on a middle point between a differential mode filter inductor and a pull-back bus, wherein the common-mode filter inductor is an enhanced common-mode filter unit; magnetic flux, formed in a magnetic core, by differential mode current is cancelled out, and therefore, an inductance value of the common-mode filter unit is not affected by the differential mode current. The common-mode voltage suppression system reduces attenuation interferences of high common-mode voltage to differential mode inductor, reduces filter pressure of backward-stage common-mode inductor and drops most of common-mode voltage onto a second common-mode filter inductor, so that the high common-mode voltage is suppressed with low cost, the interferences of the common-mode voltage to a power grid side are effectively reduced and an EMC (electro magnetic compatibility) current situation of the complete machine is optimized.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of common-mode voltage for photovoltaic combining inverter and suppress system.
Background technology
Photovoltaic combining inverter is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) photovoltaic panel direct current energy being converted to AC energy.Solar energy, as the important member in new forms of energy troop, is subject to the extensive concern of countries in the world in recent years, and distributed photovoltaic power generation brings this clean energy resource into huge numbers of families, allows everyone can enjoy green energy resource to the facility brought of living.The grid-connect mode of distributed photovoltaic inverter often selects low voltage electric network inverter being directly incorporated into terminal use, and low voltage electric network has load equipment is of a great variety, antijamming capability is uneven, requires high to the quality of power supply.This just requires that the inverter being directly incorporated into low voltage electric network has good electromagnetic compatibility (EMC).Because the DC side of photovoltaic combining inverter belongs to suspended state relative to the earth (PE); when inverter is in HF switch process; the voltage of its brachium pontis mid point is the instantaneous value that busbar voltage adds now line voltage to the voltage between the earth; and this common-mode voltage can form common mode loop by the Y capacitance over the ground in other equipment on low voltage electric network, thus affect the normal operation of other equipment.
At present, the suppression for above-mentioned common-mode voltage mainly contains following two kinds of modes: one, as shown in Figure 1, utilizes common mode filtering inductance to suppress common-mode voltage; Two, as shown in Figure 2, common mode filtering inductance and differential mode filter inductance suppress common-mode voltage jointly.The common-mode voltage that above two kinds of modes all can suppress inverter to produce to a certain extent, but all there is deficiency.For mode one, because the complete machine topology mentioned before limit, the common-mode voltage that AC converter exports over the ground is: U
cV=U
bUS+ U
oUT* sinwt, wherein: U
cVfor the common-mode voltage that AC converter exports, U
bUSfor busbar voltage, U
oUTfor exporting phase voltage, wt is the output phase voltage phase place of t.In mode one, output common mode inductance generally selects material to be the magnetic core of manganese-zinc ferrite, and the saturation magnetic induction of the manganese-zinc ferrite of routine is only 0.4T, under so large common-mode voltage effect, not only form larger current with the Y capacitance of inverter internal, also can form common mode current with the Y capacitance in terminal low voltage electric network load equipment, very easily allow common mode inductance occur saturated.Make use of differential mode filter inductance in mode two to coordinate with the electric capacity retracting bus capacitor mid point, common-mode voltage is suppressed on differential mode filter inductance, effectively can solve the problem that common mode current flows to terminal power grid like this, but for being directly incorporated into the group string inverter of terminal low voltage electric network, for overall volume, the factors such as efficiency are considered, switching frequency is all higher, the differential mode filter inductance magnetic core material selected is generally iron silicon, iron sial, the good magnetic material of the high frequency characteristicses such as amorphous, loss under this magnetic material high-frequency current is low, but the attenuation ratio of inductance value under the function of current is more serious, if common-mode voltage is all born by differential mode filter inductance, inductance value certainly will be reduced further, affect differential mode filter effect, and then affect complete machine output-index.
Summary of the invention
The object of the invention is to suppress system by a kind of common-mode voltage for photovoltaic combining inverter, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
Common-mode voltage for photovoltaic combining inverter suppresses a system, and it comprises differential mode filter inductance, retracts bus mid point electric capacity, the first common mode filtering inductance, common mode filtering Y capacitance and the second common mode filtering inductance; Wherein, described differential mode filter inductance, the first common mode filtering inductance, common mode filtering Y capacitance are connected in series successively, and described second common mode filtering inductance seals at differential mode filter inductance and retracts on bus mid point capacitor loop.
Especially, the common-mode voltage U on described differential mode filter inductance
cV1, common-mode voltage U on the second common mode filtering inductance
cV2, common-mode voltage U on the first common mode filtering inductance
cV3meet: U
cV2>U
cV1>U
cV2; The described common mode current I retracting bus mid point capacitor loop
cV1, common mode filtering Y capacitance loop common mode current I
cV2and the common mode current I in grid side Y capacitance loop
cV3meet: I
cV1>I
cV2>I
cV3.
Especially, described second common mode filtering inductance adopt but be not limited to iron silicon, iron sial, non-crystalline material any one.
The common-mode voltage for photovoltaic combining inverter that the present invention proposes suppresses system to seal in the second common mode filtering inductance at differential mode filter inductance with retracting on bus mid point capacitor loop, this common mode filtering inductance is the common mode filtering unit of enhancement mode, the magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current can not affect the inductance value of this common mode filtering unit.Present invention decreases the influence of fading of strong common-mode voltage to differential mode inductance, reduce the common common mode inductance of the rear class i.e. filtering pressure of the first common mode filtering inductance, the common-mode voltage of the overwhelming majority all drops on the second common mode filtering inductance, strong common-mode voltage is suppressed with low cost cost, effectively reduce the impact of common-mode voltage on grid side, optimize complete machine EMC present situation.
Accompanying drawing explanation
Fig. 1 is the system construction drawing utilizing common mode filtering inductance to suppress common-mode voltage;
Fig. 2 is the system construction drawing utilizing common mode filtering inductance and differential mode filter inductance jointly to suppress common-mode voltage;
Fig. 3 is the structure chart of the present invention for the common-mode voltage suppression system of photovoltaic combining inverter;
Fig. 4 is common-mode voltage U in the present invention
cV2, U
cV1, U
cV3, common mode current I
cV1, I
cV2, I
cV3distribution map.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content, unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.Term used herein, just in order to describe specific embodiment, is not intended to be restriction the present invention.
Please refer to shown in Fig. 3, Fig. 3 is the structure chart of the present invention for the common-mode voltage suppression system of photovoltaic combining inverter.
Suppress that system specifically comprises differential mode filter inductance 301, retracts bus mid point electric capacity 302, first common mode filtering inductance 303 for the common-mode voltage of photovoltaic combining inverter in the present embodiment, common mode filtering Y capacitance 304 and the second common mode filtering inductance 305.Described differential mode filter inductance 301, first common mode filtering inductance 303, common mode filtering Y capacitance 304 are connected in series successively.Described second common mode filtering inductance 305 seals at differential mode filter inductance 301 and retracts on bus mid point electric capacity 302 loop.
In the second common mode filtering inductance 305 described in the present embodiment adopt but be not limited to iron silicon, iron sial, non-crystalline material any one.During work, the magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current can not affect the inductance value of the second common mode filtering inductance 305.Present invention decreases the influence of fading of strong common-mode voltage to differential mode inductance, reduce the common common mode inductance of the rear class i.e. filtering pressure of the first common mode filtering inductance 303, the common-mode voltage of the overwhelming majority all drops on the second common mode filtering inductance 305.As shown in Figure 4, Fig. 4 is common-mode voltage U in the present invention
cV2, U
cV1, U
cV3, common mode current I
cV1, I
cV2, I
cV3distribution map, by rational inductor design, the common-mode voltage U on described differential mode filter inductance 301 can be made
cV1, common-mode voltage U on the second common mode filtering inductance 305
cV2, common-mode voltage U on the first common mode filtering inductance 303
cV3meet: U
cV2>U
cV1->U
cV2.By rational capacitor's capacity type selecting, described in can making, retract the common mode current I in bus mid point electric capacity 302 loop
cV1, common mode filtering Y capacitance 304 loop common mode current I
cV2and the common mode current I in grid side Y capacitance 306 loop
cV3meet: I
cV1>I
cV2>I
cV3.
It should be noted that, technical scheme of the present invention can be applied in photovoltaic combining inverter, also can be applied in other high common mode out-put supply system; The outlet side of AC power can be applied in, also can at the input side of AC power.
Technical scheme of the present invention seals in the second common mode filtering inductance at differential mode filter inductance with retracting on bus mid point capacitor loop, this common mode filtering inductance is the common mode filtering unit of enhancement mode, the magnetic flux that differential-mode current is formed in magnetic core is cancelled out each other, therefore differential-mode current can not affect the inductance value of this common mode filtering unit.Present invention decreases the influence of fading of strong common-mode voltage to differential mode inductance, reduce the filtering pressure of the first common mode filtering inductance, the common-mode voltage of the overwhelming majority all drops on the second common mode filtering inductance, strong common-mode voltage is suppressed with low cost cost, effectively reduce the impact of common-mode voltage on grid side, optimize complete machine EMC present situation.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (3)
1. the common-mode voltage for photovoltaic combining inverter suppresses a system, it is characterized in that, comprises differential mode filter inductance, retracts bus mid point electric capacity, the first common mode filtering inductance, common mode filtering Y capacitance and the second common mode filtering inductance; Wherein, described differential mode filter inductance, the first common mode filtering inductance, common mode filtering Y capacitance are connected in series successively, and described second common mode filtering inductance seals at differential mode filter inductance and retracts on bus mid point capacitor loop.
2. the common-mode voltage for photovoltaic combining inverter according to claim 1 suppresses system, it is characterized in that, the common-mode voltage U on described differential mode filter inductance
cV1, common-mode voltage U on the second common mode filtering inductance
cV2, common-mode voltage U on the first common mode filtering inductance
cV3meet: U
cV2>U
cV1>U
cV2; The described common mode current I retracting bus mid point capacitor loop
cV1, common mode filtering Y capacitance loop common mode current I
cV2and the common mode current I in grid side Y capacitance loop
cV3meet: I
cV1>I
cV2>I
cV3.
3. the common-mode voltage for photovoltaic combining inverter according to any one of claim 1 or 2 suppresses system, it is characterized in that, described second common mode filtering inductance adopt but be not limited to iron silicon, iron sial, non-crystalline material any one.
Priority Applications (1)
| 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 true CN104638891A (en) | 2015-05-20 |
| CN104638891B CN104638891B (en) | 2018-02-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107492905A (en) * | 2017-08-22 | 2017-12-19 | 上能电气股份有限公司 | A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device |
| CN108039815A (en) * | 2017-12-15 | 2018-05-15 | 西安许继电力电子技术有限公司 | A kind of electromagnetic interference suppression circuit and its operating method |
| 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 |
| 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 |
| US11177660B2 (en) | 2020-01-27 | 2021-11-16 | Mitsubishi Electric Power Products, Inc. | System and method for power converter control for virtual impedance |
| EP3857698A4 (en) * | 2018-09-27 | 2022-06-15 | ABB Schweiz AG | Apparatus for conversion between ac power and dc power |
| CN117476402A (en) * | 2023-12-28 | 2024-01-30 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107492905A (en) * | 2017-08-22 | 2017-12-19 | 上能电气股份有限公司 | A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device |
| 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 |
| CN108039815A (en) * | 2017-12-15 | 2018-05-15 | 西安许继电力电子技术有限公司 | A kind of electromagnetic interference suppression circuit and its operating method |
| 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 |
| EP3857698A4 (en) * | 2018-09-27 | 2022-06-15 | ABB Schweiz AG | Apparatus for conversion between ac power and dc power |
| US11418106B2 (en) | 2018-09-27 | 2022-08-16 | 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 |
| CN117476402A (en) * | 2023-12-28 | 2024-01-30 | 锦浪科技股份有限公司 | Relay actuation method for reducing impact current and photovoltaic system |
| 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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| CN104638891B (en) | 2018-02-13 |
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