CN203416162U - Photovoltaic inverter-used du/dt filter circuit - Google Patents
Photovoltaic inverter-used du/dt filter circuit Download PDFInfo
- Publication number
- CN203416162U CN203416162U CN201320543547.7U CN201320543547U CN203416162U CN 203416162 U CN203416162 U CN 203416162U CN 201320543547 U CN201320543547 U CN 201320543547U CN 203416162 U CN203416162 U CN 203416162U
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- Prior art keywords
- filter
- inductance
- bridge circuit
- circuit
- common mode
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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
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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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- 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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- Inverter Devices (AREA)
Abstract
The utility model relates to a photovoltaic inverter-used du/dt filter circuit comprising a three-phase inverter bridge circuit having an anode DC input end, a cathode DC input end and three-phase AC output ends; the filter circuit also comprises at least three network side filter inductors, at least three common mode inhibition filter inductor, and at least three RC branches; each output end of the three-phase inverter bridge circuit is respectively connected with a common mode inhibition filter inductor and a network side filter inductor; the three RC branches are respectively provided with filter capacitors and resistors; damping resistance ends of the three RC branches are simultaneously connected with the anode input end or the cathode input end of the three-phase inverter bridge circuit; filter capacitor output ends of the three RC branches are respectively connected between each common mode inhibition filter inductor and the network side filter inductor. The photovoltaic inverter-used du/dt filter circuit can control over-high peak voltage of common mode voltage and common mode current, thereby reducing leakage current into a safe scope, and simultaneously reducing electromagnetic interferences generated by the high frequency common mode voltage.
Description
Technical field
The utility model relates to field of photovoltaic power generation, particularly a kind of photovoltaic DC-to-AC converter du/dt filter circuit.
Background technology
At present in photovoltaic generating system, inverter is mainly by the earth-free transformer access in time limit electrical network, the distributed capacitance over the ground of inverter, circuit, transformer is by ground wire or greatly, connect with the distributed capacitance over the ground of photovoltaic pond plate, form common-mode path, the common-mode voltage that inverter work produces has very high crest voltage (du/dt), act on above distributed capacitance, can produce the very large leakage current of common mode over the ground, the safety of the harm person and equipment, and can produce a large amount of electromagnetic interference.
Utility model content
For structural deficiency in prior art, the purpose of this utility model is to provide a kind of photovoltaic DC-to-AC converter du/dt filter circuit, comprise the three-phase inversion bridge circuit with positive and negative electrode direct-flow input end and three-phase alternating current output, this filter circuit also comprises at least three the first inductance and at least three RC branch roads;
Each phase output terminal of described three-phase inversion bridge circuit is connected with one end of first inductance respectively;
Described three RC branch roads comprise respectively electric capacity and the resistance being connected in series, the capacitance terminal of each RC branch road is connected with the other end of the first inductance of each output of three-phase inversion bridge circuit respectively, and the resistance terminal of each RC branch road is connected with the electrode input end of three-phase inversion bridge circuit; Or
Described three RC branch roads comprise respectively electric capacity and the resistance being connected in series, the capacitance terminal of each RC branch road is connected with the other end of the first inductance on each output of three-phase inversion bridge circuit respectively, and the resistance terminal of each RC branch road is connected with the negative input of three-phase inversion bridge circuit.
Preferably, described the first inductance is current stabilization filter inductance.
Described filter circuit further comprises respectively three the second filter inductances that are connected with the other end of the first inductance on each output of three-phase inversion bridge circuit.
Preferably, described the second filter inductance is net side filter inductance.
Preferably, described electric capacity is filter capacitor.
Preferably, the electric capacity model in each RC branch road is identical.
The utility model beneficial effect is effectively to suppress high frequency common mode voltage, thereby leakage current is reduced in safe range, reduces potential safety hazard, reduces the electromagnetic interference producing due to high frequency common mode voltage simultaneously.
Accompanying drawing explanation
Fig. 1 illustrates according to the circuit structure diagram of the utility model embodiment 1
Fig. 2 illustrates according to the circuit structure diagram of the utility model embodiment 2
Embodiment
Below in conjunction with accompanying drawing, utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of photovoltaic DC-to-AC converter du/dt filter circuit, comprise at least three the net side filter inductances of three-phase inversion bridge circuit with positive and negative electrode direct-flow input end and three-phase alternating current output, this filter circuit also comprises at least three common mode inhibition filter inductances and at least three RC branch roads;
Each output of described three-phase inversion bridge circuit connects respectively a common mode inhibition filter inductance and a net side filter inductance;
Described three RC branch roads include filter capacitor and the resistance of same model, the damping resistance end of described three RC branch roads is connected with the negative input of three-phase inversion bridge circuit simultaneously, and the filter capacitor output of described three RC branch roads is connected between each common mode inhibition filter inductance and net side filter inductance.
When inverter is worked, RC branch road absorption peak voltage became common-mode voltage low-frequency voltage before entering electrical network, and common mode inhibition filter inductance is reduced to the common mode current producing in three-phase inversion bridge circuit in safe range.Thereby, reach leakage current is reduced in safe range, reduced the object of the electromagnetic interference producing due to high frequency common mode voltage simultaneously.
Embodiment 2
As shown in Figure 2, a kind of photovoltaic DC-to-AC converter du/dt filter circuit, comprise at least three the net side filter inductances of three-phase inversion bridge circuit with positive and negative electrode direct-flow input end and three-phase alternating current output, this filter circuit also comprises at least three common mode inhibition filter inductances and at least three RC branch roads;
Each output of described three-phase inversion bridge circuit connects respectively a common mode inhibition filter inductance and a net side filter inductance;
Described three RC branch roads include filter capacitor and the resistance of same model, the damping resistance end of described three RC branch roads is connected with the electrode input end of three-phase inversion bridge circuit simultaneously, and the filter capacitor output of described three RC branch roads is connected between each common mode inhibition filter inductance and net side filter inductance.
When inverter is worked, RC branch road absorption peak voltage became common-mode voltage low-frequency voltage before entering electrical network, and common mode inhibition filter inductance is reduced to the common mode current producing in three-phase inversion bridge circuit in safe range.Thereby, reach leakage current is reduced in safe range, reduced the object of the electromagnetic interference producing due to high frequency common mode voltage simultaneously.
Above content is the explanation that describes in further detail of the utility model being done in conjunction with concrete preferred implementation, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the those of ordinary skill of technical field described in the utility model, without departing from the concept of the premise utility, can also make some simple deductions replacement alive, all should be considered as belonging to protection range of the present utility model.
Claims (6)
1. a photovoltaic DC-to-AC converter du/dt filter circuit, comprises with the three-phase inversion bridge circuit of positive and negative electrode direct-flow input end and three-phase alternating current output, it is characterized in that, this filter circuit also comprises at least three the first inductance and at least three RC branch roads;
Each phase output terminal of described three-phase inversion bridge circuit is connected with one end of first inductance respectively;
Described three RC branch roads comprise respectively electric capacity and the resistance being connected in series, the capacitance terminal of each RC branch road is connected with the other end of the first inductance of each output of three-phase inversion bridge circuit respectively, and the resistance terminal of each RC branch road is connected with the electrode input end of three-phase inversion bridge circuit; Or
Described three RC branch roads comprise respectively electric capacity and the resistance being connected in series, the capacitance terminal of each RC branch road is connected with the other end of the first inductance on each output of three-phase inversion bridge circuit respectively, and the resistance terminal of each RC branch road is connected with the negative input of three-phase inversion bridge circuit.
2. photovoltaic DC-to-AC converter as claimed in claim 1 du/dt filter circuit, is characterized in that, described the first inductance is common mode inhibition filter inductance.
3. photovoltaic DC-to-AC converter as claimed in claim 1 du/dt filter circuit, is characterized in that, described filter circuit further comprises respectively three the second filter inductances that are connected with the other end of the first inductance on each output of three-phase inversion bridge circuit.
4. photovoltaic DC-to-AC converter as claimed in claim 3 du/dt filter circuit, is characterized in that, described the second filter inductance is net side filter inductance.
5. photovoltaic DC-to-AC converter as claimed in claim 1 du/dt filter circuit, is characterized in that, described electric capacity is filter capacitor.
6. photovoltaic DC-to-AC converter as claimed in claim 1 du/dt filter circuit, is characterized in that, the electric capacity model in each RC branch road is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320543547.7U CN203416162U (en) | 2013-09-03 | 2013-09-03 | Photovoltaic inverter-used du/dt filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320543547.7U CN203416162U (en) | 2013-09-03 | 2013-09-03 | Photovoltaic inverter-used du/dt filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203416162U true CN203416162U (en) | 2014-01-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320543547.7U Expired - Lifetime CN203416162U (en) | 2013-09-03 | 2013-09-03 | Photovoltaic inverter-used du/dt filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203416162U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964497A (en) * | 2017-05-19 | 2018-12-07 | 丰郅(上海)新能源科技有限公司 | Inhibit the inversion system of common mode interference |
| CN110690830A (en) * | 2018-06-20 | 2020-01-14 | 浙江昱能科技有限公司 | Three-phase inverter and control method thereof |
| WO2021142873A1 (en) * | 2020-01-17 | 2021-07-22 | 昱能科技股份有限公司 | Control method and system for three-phase grid-connected inverter, and three-phase grid-connected inverter |
-
2013
- 2013-09-03 CN CN201320543547.7U patent/CN203416162U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964497A (en) * | 2017-05-19 | 2018-12-07 | 丰郅(上海)新能源科技有限公司 | Inhibit the inversion system of common mode interference |
| CN110690830A (en) * | 2018-06-20 | 2020-01-14 | 浙江昱能科技有限公司 | Three-phase inverter and control method thereof |
| WO2021142873A1 (en) * | 2020-01-17 | 2021-07-22 | 昱能科技股份有限公司 | Control method and system for three-phase grid-connected inverter, and three-phase grid-connected inverter |
| US11695350B2 (en) | 2020-01-17 | 2023-07-04 | Altenergy Power System Inc. | Control method and system for three-phase grid-connected inverter, and three-phase grid-connected inverter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |