CN203933039U - A kind of photovoltaic combining inverter - Google Patents
A kind of photovoltaic combining inverter Download PDFInfo
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- CN203933039U CN203933039U CN201420091528.XU CN201420091528U CN203933039U CN 203933039 U CN203933039 U CN 203933039U CN 201420091528 U CN201420091528 U CN 201420091528U CN 203933039 U CN203933039 U CN 203933039U
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- low frequency
- frequency switching
- switch pipe
- switching tube
- negative pole
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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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Abstract
The utility model openly provides a kind of photovoltaic combining inverter.This photovoltaic combining inverter comprises four pipes that open the light, wherein two switching tubes are HF switch pipe, two pipes that open the light are for the low frequency pipe that opens the light, and in line voltage positive half period and negative half-cycle, all only have a HF switch pipe open-minded, reduce the loss of the pipe that opens the light, improved the conversion efficiency of electric energy.Meanwhile, the topological structure of this photovoltaic combining inverter remains unchanged the common-mode voltage of the parasitic capacitance existing between photovoltaic array and ground, thereby has eliminated common mode current, has reduced potential safety hazard.
Description
Technical field
The utility model relates to field of photovoltaic power generation, relates in particular a kind of photovoltaic combining inverter.
Background technology
Day by day exhausted situation at the energy is in love, and development and utilization regenerative resource is more and more subject to people's attention.In numerous regenerative resources, solar energy power generating is considered to new energy technology the most promising on our times.Photovoltaic DC-to-AC converter, as the important component part in photovoltaic generation, is mainly used in transferring the direct current of photovoltaic array output to alternating current.
Existing photovoltaic DC-to-AC converter mainly comprises isolation type grid-connected inverter and without isolation type grid-connected inverter.Wherein, isolation type grid-connected inverter mainly carries out electrical isolation by isolating transformer by DC side and AC, and energy conversion efficiency is low.Although non-isolation type combining inverter improves energy conversion efficiency by omitting isolating transformer, but owing to having parasitic capacitance between photovoltaic array and ground, in parasitic capacitance, the variation of common-mode voltage gathers and in parasitic capacitance, produces common mode current (leakage current), thereby makes photovoltaic combining inverter have potential safety hazard.
Utility model content
In view of this, the utility model provides a kind of photovoltaic combining inverter, with in ensureing energy conversion efficiency, eliminates common mode current, reduces potential safety hazard.
For achieving the above object, the utility model provides following technical scheme:
A kind of photovoltaic combining inverter, comprising: photovoltaic array, two HF switch pipes, two low frequency switching tubes, two electric capacity, two diodes, two inductance, electrical networks and control described HF switch pipe and control circuit that described low frequency switching tube is opened or closed;
Wherein, the positive pole of capacitor C 1 is connected with the cathode node of the output of described photovoltaic array, and negative pole is connected with the negative pole node of the output of described photovoltaic array;
HF switch pipe S1, inductance L 2 and low frequency switching tube S2 series connection, and the positive pole of described HF switch pipe S1 is connected with the cathode node of the output of described photovoltaic array, the negative pole of described low frequency switching tube S2 is connected with the negative pole node of the output of described photovoltaic array;
HF switch pipe S3, inductance L 1 and low frequency switching tube S4 series connection, and the positive pole of described HF switch pipe S3 is connected with the cathode node of the output of described photovoltaic array, the negative pole of described low frequency switching tube S4 is connected with the negative pole node of the output of described photovoltaic array;
The negative pole of diode D2 is connected with the current input terminal of described inductance L 2, and the negative pole of anodal and described low frequency switching tube S2 is connected;
The negative pole of diode D1 is connected with the current input terminal of described inductance L 1, and the negative pole of anodal and described low frequency switching tube S4 is connected;
Terminals of capacitor C 2 are connected with the negative pole of described HF switch pipe S1, and another terminals are connected with the current input terminal of described inductance L 1;
Two terminals of described electrical network are connected with two terminals of described capacitor C 2 respectively;
When in line voltage positive half period, it is always open-minded that described control circuit is used for controlling described low frequency switching tube S4, and described low frequency switching tube S2 and described HF switch pipe S3 close always, and described HF switch pipe S1 is adopted to PWM modulation;
When in line voltage negative half-cycle, it is always open-minded that described control circuit is used for controlling described low frequency switching tube S2, and described HF switch pipe S1 and described low frequency switching tube S4 close always, and described HF switch pipe S3 is adopted to PWM modulation.
Preferably, also comprise: be connected in the relay between described the second electric capacity and described electrical network.
Preferably, described control circuit is taking TMS320F2808 chip as core.
Preferably, also comprise: gather described photovoltaic array output voltage, described line voltage, described photovoltaic array output current and described photovoltaic grid connection inverter output current signal acquisition circuit;
Be connected with described signal acquisition circuit, the voltage and current that described signal acquisition circuit is collected is converted to the signaling conversion circuit of the discernible control signal of described control circuit;
Preferably, described signal acquisition circuit comprises:
Gather described photovoltaic array output voltage and described line voltage difference channel;
Gather the current sensor of described photovoltaic array output current and described photovoltaic grid connection inverter output current.
Preferably, described current sensor adopts VAC current sensor.
Known via above-mentioned technical scheme, compared with prior art, the utility model openly provides a kind of photovoltaic combining inverter.This photovoltaic combining inverter comprises four pipes that open the light, wherein two switching tubes are HF switch pipe, two pipes that open the light are for the low frequency pipe that opens the light, and in line voltage positive half period and negative half-cycle, all only have a HF switch pipe open-minded, reduce the loss of the pipe that opens the light, improved the conversion efficiency of electric energy.Meanwhile, the topological structure of this photovoltaic combining inverter remains unchanged the common-mode voltage of the parasitic capacitance existing between photovoltaic array and ground, thereby has eliminated common mode current, has reduced potential safety hazard.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 shows the topological structure schematic diagram of a kind of photovoltaic combining inverter of the utility model;
Fig. 2 shows control circuit the PWM of photovoltaic combining inverter is regulated to pattern diagram;
Fig. 3 shows the line voltage positive half period high frequency current direction figure of pipe S1 while opening that open the light;
Current direction figure when Fig. 4 shows line voltage positive half period HF switch pipe S1 closure;
Fig. 5 shows the line voltage negative half-cycle high frequency current direction figure of pipe S3 while opening that open the light;
Current direction figure when Fig. 6 shows line voltage symbol half period HF switch pipe S3 closure.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Show the topological structure schematic diagram of a kind of photovoltaic combining inverter of the utility model referring to Fig. 1.
As shown in Figure 1, the topological structure of this photovoltaic combining inverter comprises: photovoltaic array PV, two HF switch pipes (S1 and S3), two low frequency switching tubes (S2 and S4), two electric capacity (L1 and L2), two diodes (D1 and D2), two inductance (L1 and L2) and electrical network.
Wherein, the positive pole of capacitor C 1 is connected with the cathode node of the output of photovoltaic array PV, and negative pole is connected with the negative pole node of the output of photovoltaic array PV.
HF switch pipe S1, inductance L 2 and low frequency switching tube S2 series connection, and the positive pole of HF switch pipe S1 is connected with the cathode node of the output of photovoltaic array PV, and the negative pole of low frequency switching tube S2 is connected with the negative pole node of the output of photovoltaic array PV.
HF switch pipe S3, inductance L 1 and low frequency switching tube S4 series connection, and the positive pole of described HF switch pipe S3 is connected with the cathode node of the output of described photovoltaic array, the negative pole of described low frequency switching tube S4 is connected with the negative pole node of the output of described photovoltaic array.
The negative pole of diode D2 is connected with the current input terminal of described inductance L 2, and the negative pole of anodal and described low frequency switching tube S2 is connected.
The negative pole of diode D1 is connected with the current input terminal of described inductance L 1, and the negative pole of anodal and described low frequency switching tube S4 is connected.
Terminals of capacitor C 2 are connected with the negative pole of described HF switch pipe S1, and another terminals are connected with the current input terminal of described inductance L 1.
Two terminals of described electrical network are connected with two terminals of described capacitor C 2 respectively.
It should be noted that, this photovoltaic combining inverter also comprises the control circuit (not shown in FIG.) that control HF switch pipe and low frequency switching tube are opened or closed in actual applications.
Its operation principle is as follows:
When in line voltage positive half period, S4 is always open-minded for this control circuit control low frequency switching tube, and low frequency switching tube S2 and HF switch pipe S3 close always, and HF switch pipe S1 is adopted to PWM modulation.
When in line voltage negative half-cycle, it is always open-minded that described control circuit is used for controlling described low frequency switching tube S2, and described HF switch pipe S1 and described low frequency switching tube S4 close always, and described HF switch pipe S3 is adopted to PWM modulation.
Referring to Fig. 2～Fig. 6, Fig. 2 shows control circuit the PWM of photovoltaic combining inverter is regulated to pattern diagram, Fig. 3 shows the line voltage positive half period high frequency current direction figure of pipe S1 while opening that open the light, current direction figure when Fig. 4 shows line voltage positive half period HF switch pipe S1 closure, Fig. 5 shows the line voltage negative half-cycle high frequency current direction figure of pipe S3 while opening that open the light, and Fig. 6 shows the current direction figure of line voltage symbol half period HF switch pipe S3 when closed.
In the time that line voltage positive half period HF switch pipe S1 opens, the current circuit of photovoltaic combining inverter is: HF switch pipe S1～electrical network～inductance L 2～low frequency switching tube S4～capacitor C 1;
In the time that line voltage positive half period HF switch pipe S1 turn-offs, the current circuit of photovoltaic combining inverter is now: low frequency switching tube S4～diode D2～electrical network～inductance～L1;
In the time that line voltage negative half-cycle HF switch pipe S3 opens, the current circuit of photovoltaic combining inverter is: high frequency opens the light and manages S3～electrical network～inductance L 2～low frequency switching tube S2～capacitor C 1;
In the time that line voltage negative half-cycle HF switch pipe S3 turn-offs, the current circuit of photovoltaic combining inverter is: low frequency switching tube S2～diode D2～electrical network～inductance L 2.
It should be noted that, in actual application in order to realize the power supply control of photovoltaic combining inverter to electrical network, in other embodiment of the present utility model, also comprise: be arranged on the relay between capacitor C 2 and electrical network, those skilled in the art can be by controlling opening or the closed break-make that realizes photovoltaic combining inverter and electrical network of this relay contact.
Optionally, in other embodiment of the present utility model, control circuit is taking TMS320F2808 chip as core, make photovoltaic DC-to-AC converter output current and line voltage same-phase by controlling H bridge and continuous current circuit, realize photovoltaic array maximum power output simultaneously and suppress leakage current, improving the conversion efficiency of whole photovoltaic system.
The utility model adopts two difference channels to gather respectively photovoltaic array output voltage and line voltage, adopt two VAC current sensors to gather respectively output current and the photovoltaic grid connection inverter output current of photovoltaic array simultaneously, the AD that the signal that all these collect is converted to TMS320F2808 chip through signaling conversion circuit adopts a mouthful discernible signal, such as the voltage signal of nursing one's health between 0-3V, the AD thief hatch that is core by this voltage signal input TMS320F2808 chip, and export corresponding pwm pulse according to the control strategy setting in advance.The utility model adopts phase-locked loop pll technology to obtain the angle information of power grid control, thereby realizes the PWM modulation to photovoltaic combining inverter.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, article or the equipment that comprises described key element and also have other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the application.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the case of not departing from the application's spirit or scope, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a photovoltaic combining inverter, it is characterized in that, comprising: photovoltaic array, two HF switch pipes, two low frequency switching tubes, two electric capacity, two diodes, two inductance, electrical networks and control described HF switch pipe and control circuit that described low frequency switching tube is opened or closed;
Wherein, the positive pole of capacitor C 1 is connected with the cathode node of the output of described photovoltaic array, and negative pole is connected with the negative pole node of the output of described photovoltaic array;
HF switch pipe S1, inductance L 2 and low frequency switching tube S2 series connection, and the positive pole of described HF switch pipe S1 is connected with the cathode node of the output of described photovoltaic array, the negative pole of described low frequency switching tube S2 is connected with the negative pole node of the output of described photovoltaic array;
HF switch pipe S3, inductance L 1 and low frequency switching tube S4 series connection, and the positive pole of described HF switch pipe S3 is connected with the cathode node of the output of described photovoltaic array, the negative pole of described low frequency switching tube S4 is connected with the negative pole node of the output of described photovoltaic array;
The negative pole of diode D2 is connected with the current input terminal of described inductance L 2, and the negative pole of anodal and described low frequency switching tube S2 is connected;
The negative pole of diode D1 is connected with the current input terminal of described inductance L 1, and the negative pole of anodal and described low frequency switching tube S4 is connected;
Terminals of capacitor C 2 are connected with the negative pole of described HF switch pipe S1, and another terminals are connected with the current input terminal of described inductance L 1;
Two terminals of described electrical network are connected with two terminals of described capacitor C 2 respectively;
When in line voltage positive half period, it is always open-minded that described control circuit is used for controlling described low frequency switching tube S4, and described low frequency switching tube S2 and described HF switch pipe S3 close always, and described HF switch pipe S1 is adopted to PWM modulation;
When in line voltage negative half-cycle, it is always open-minded that described control circuit is used for controlling described low frequency switching tube S2, and described HF switch pipe S1 and described low frequency switching tube S4 close always, and described HF switch pipe S3 is adopted to PWM modulation.
2. photovoltaic combining inverter according to claim 1, is characterized in that, also comprises: be connected in the relay between described the second electric capacity and described electrical network.
3. photovoltaic combining inverter according to claim 1, is characterized in that, described control circuit is taking TMS320F2808 chip as core.
4. photovoltaic combining inverter according to claim 1, it is characterized in that, also comprise: the signal acquisition circuit that gathers the output current of the voltage of the output voltage of described photovoltaic array, described electrical network, described photovoltaic array and the output current of described photovoltaic combining inverter;
Be connected with described signal acquisition circuit, the voltage and current that described signal acquisition circuit is collected is converted to the signaling conversion circuit of the discernible control signal of described control circuit.
5. photovoltaic combining inverter according to claim 4, is characterized in that, described signal acquisition circuit comprises:
Gather the difference channel of the output voltage of described photovoltaic array and the voltage of described electrical network;
Gather the current sensor of the output current of described photovoltaic array and the output current of described photovoltaic combining inverter.
6. photovoltaic combining inverter according to claim 5, is characterized in that, described current sensor adopts VAC current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420091528.XU CN203933039U (en) | 2014-03-03 | 2014-03-03 | A kind of photovoltaic combining inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420091528.XU CN203933039U (en) | 2014-03-03 | 2014-03-03 | A kind of photovoltaic combining inverter |
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| CN203933039U true CN203933039U (en) | 2014-11-05 |
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| CN201420091528.XU Expired - Fee Related CN203933039U (en) | 2014-03-03 | 2014-03-03 | A kind of photovoltaic combining inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795085A (en) * | 2014-03-03 | 2014-05-14 | 苏州大学 | Photovoltaic grid-connected inverter |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
-
2014
- 2014-03-03 CN CN201420091528.XU patent/CN203933039U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795085A (en) * | 2014-03-03 | 2014-05-14 | 苏州大学 | Photovoltaic grid-connected inverter |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20170303 |