CN203788184U - New grounding common-mode current inhibition circuit of photovoltaic grid-connected inverter - Google Patents
New grounding common-mode current inhibition circuit of photovoltaic grid-connected inverter Download PDFInfo
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- CN203788184U CN203788184U CN201420094166.XU CN201420094166U CN203788184U CN 203788184 U CN203788184 U CN 203788184U CN 201420094166 U CN201420094166 U CN 201420094166U CN 203788184 U CN203788184 U CN 203788184U
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- mode current
- power switch
- circuit
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- common mode
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- 230000005764 inhibitory process Effects 0.000 title abstract 4
- 238000005070 sampling Methods 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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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
Provided is a new grounding common-mode current inhibition circuit of a photovoltaic grid-connected inverter. The new grounding common-mode current inhibition circuit comprises a drain electrode and a source electrode, the drain electrode is connected to a photovoltaic array output negative row of the photovoltaic inverter, the source electrode is connected to a power switch tube of a grounding copper bar at the inner part of an inverter casing, a current sampling circuit is connected between the power switch tube and the grounding copper bar at the inner part of the inverter casing in series, the current sampling circuit is connected with a control unit and a driving unit in sequence, and the driving unit is connected with the power switch tube. The current sampling circuit uploads sampled grounding common-mode current signals to the control unit, the control unit performs closed-loop control processing of the current and emits driving signals to the driving unit, and the driving unit amplifies the driving signals, outputs control signals, and controls the turn-on and turn-off of the power switch tube VT. According to the new grounding common-mode current inhibition circuit, the grounding common-mode current is effectively inhibited, and a good electromagnetic compatible effect is achieved.
Description
Technical field
The utility model relates to photovoltaic combining inverter ground connection common mode current and suppresses technical field, is specifically related to a kind of novel photovoltaic combining inverter ground connection common mode current and suppresses circuit.
Background technology
In high-power inverter occasion, especially in the occasion of photovoltaic combining inverter applied film assembly, because film assembly need to, by the negative row of the photovoltaic array output ground connection of assembly, in such cases, there will be the problem of serious ground connection common mode current in inverter.Along with the large-scale application of film assembly, this problem more highlights.In engineering, be at present the size that impedance by increasing common mode current suppresses this electric current for the common way of this problem, this kind of method taken into account aspect EMC and ground connection common mode current, and contradiction point is outstanding, even cannot obtain both balances.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the purpose of this utility model is to provide a kind of novel photovoltaic combining inverter ground connection common mode current to suppress circuit, in effectively suppressing ground connection common mode current, obtains good electromagnetic compatibility effect.
For reaching above object, the utility model adopts following technical scheme:
A kind of novel photovoltaic combining inverter ground connection common mode current suppresses circuit, comprise drain electrode and source electrode, drain electrode is connected on the negative row of photovoltaic array output of photovoltaic DC-to-AC converter, the power switch pipe that source electrode is connected on the grounding copper bar of inverter casing inside is serially connected with current sampling circuit between described power switch pipe and the grounding copper bar of inverter casing inside, be connected with control unit and driver element in turn with described current sampling circuit, described driver element is connected with power switch pipe, controls it and opens and turn-off.
Described power switch pipe adopts MOSFET or IGBT controllable type power semiconductor.
Described control unit is realized and being controlled by DSP, single-chip microcomputer or CPLD processor.
Described current sampling circuit adopts AD sample circuit to sample to electric current.
Compared to the prior art, the utlity model has following advantage:
1) the utility model by the employing close-loop control mode to common mode current in circuit, has effectively reduced the common mode current in circuit, has overcome common mode current size and be subject to the impact of device parameter differences.
2) this circuit structure is simple, is easy to realize, and this circuit structure does not affect primary circuit simultaneously.
3) the utility model by the contradiction point of electromagnetic compatibility and common mode current separately, is conducive to the solution of electromagnetic compatibility problem.
Brief description of the drawings
Accompanying drawing is that the utility model common mode current suppresses circuit diagram.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in drawings, a kind of novel photovoltaic combining inverter ground connection common mode current of the utility model suppresses circuit, comprise drain electrode and source electrode, drain electrode is connected on the negative row of photovoltaic array output of photovoltaic DC-to-AC converter, source electrode is connected to the power switch pipe on the grounding copper bar of inverter casing inside, between described power switch pipe and the grounding copper bar of inverter casing inside, be serially connected with current sampling circuit, be connected with control unit and driver element in turn with described current sampling circuit, the grid of described driver element and power switch pipe is connected, and controls it and opens and turn-off.
As preferred implementation of the present utility model, described power switch pipe adopts MOSFET or IGBT controllable type power semiconductor.
As preferred implementation of the present utility model, described control unit is realized and being controlled by DSP, single-chip microcomputer or CPLD processor.
As preferred implementation of the present utility model, described current sampling circuit adopts AD sample circuit to sample to electric current.
Operation principle of the present utility model is: the ground connection common mode current signal sampling is uploaded to control unit by current sampling circuit, control unit carries out closed-loop control processing to electric current, send and drive signal to driver element, driver element amplifies driving signal, then export control signal, power ratio control switching tube VT opening and turn-offing.
The utility model is sampled to the negative ground connection common mode current being discharged between inverter casing (the earth) of photovoltaic array output of photovoltaic DC-to-AC converter by current sampling circuit, current sampling signal is delivered to control unit and carry out closed-loop control processing, compare by sample rate current and default current effective value, error to both is analyzed, process, finally obtain the driving signal of driving power switching tube, this driving signal amplifies through driver element, then output drive signal, be used for the grid of driving power switching tube VT, reach turning on and off of power ratio control switching tube VT, the method has changed the negative electric current continuous contact time that is discharged to inverter casing (the earth) of photovoltaic array output of flowing through (because switching tube is now operated under high frequency condition, therefore can ignore the time that switching tube turn-offs), thereby realize the control to ground connection common mode current size.
Claims (4)
1. a novel photovoltaic combining inverter ground connection common mode current suppresses circuit, comprise drain electrode and source electrode, it is characterized in that: drain electrode is connected on the negative row of photovoltaic array output of photovoltaic DC-to-AC converter, source electrode is connected to the power switch pipe on the grounding copper bar of inverter casing inside, between described power switch pipe and the grounding copper bar of inverter casing inside, be serially connected with current sampling circuit, be connected with control unit and driver element in turn with described current sampling circuit, described driver element is connected with power switch pipe, controls it and opens and turn-off.
2. a kind of novel photovoltaic combining inverter ground connection common mode current according to claim 1 suppresses circuit, it is characterized in that: described power switch pipe adopts MOSFET or IGBT controllable type power semiconductor.
3. a kind of novel photovoltaic combining inverter ground connection common mode current according to claim 1 suppresses circuit, it is characterized in that: described control unit is realized and being controlled by DSP, single-chip microcomputer or CPLD processor.
4. a kind of novel photovoltaic combining inverter ground connection common mode current according to claim 1 suppresses circuit, it is characterized in that: described current sampling circuit adopts AD sample circuit to sample to electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094166.XU CN203788184U (en) | 2014-03-03 | 2014-03-03 | New grounding common-mode current inhibition circuit of photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094166.XU CN203788184U (en) | 2014-03-03 | 2014-03-03 | New grounding common-mode current inhibition circuit of photovoltaic grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203788184U true CN203788184U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420094166.XU Expired - Lifetime CN203788184U (en) | 2014-03-03 | 2014-03-03 | New grounding common-mode current inhibition circuit of photovoltaic grid-connected inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203788184U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487208A (en) * | 2016-11-28 | 2017-03-08 | 阳光电源股份有限公司 | A kind of inverter ac cable suppressing method of common-mode voltage and device over the ground |
| CN107040148A (en) * | 2017-05-02 | 2017-08-11 | 北京群菱能源科技有限公司 | A kind of photovoltaic DC-to-AC converter |
| EP3203597A4 (en) * | 2014-09-30 | 2018-11-14 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
-
2014
- 2014-03-03 CN CN201420094166.XU patent/CN203788184U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3203597A4 (en) * | 2014-09-30 | 2018-11-14 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
| US10505370B2 (en) | 2014-09-30 | 2019-12-10 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
| CN106487208A (en) * | 2016-11-28 | 2017-03-08 | 阳光电源股份有限公司 | A kind of inverter ac cable suppressing method of common-mode voltage and device over the ground |
| CN106487208B (en) * | 2016-11-28 | 2018-12-28 | 阳光电源股份有限公司 | The suppressing method and device of a kind of inverter ac cable common-mode voltage over the ground |
| CN107040148A (en) * | 2017-05-02 | 2017-08-11 | 北京群菱能源科技有限公司 | A kind of photovoltaic DC-to-AC converter |
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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 |
Granted publication date: 20140820 |
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| CX01 | Expiry of patent term |