CN105262138A - Photovoltaic module optimizer - Google Patents
Photovoltaic module optimizer Download PDFInfo
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- CN105262138A CN105262138A CN201510844141.6A CN201510844141A CN105262138A CN 105262138 A CN105262138 A CN 105262138A CN 201510844141 A CN201510844141 A CN 201510844141A CN 105262138 A CN105262138 A CN 105262138A
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- 238000010248 power generation Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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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 invention provides a photovoltaic module optimizer. The input side of the optimizer is divided into an A path and a B path which are connected with a first photovoltaic module and a second photovoltaic module respectively. The A path comprises a first input capacitor, a first switch transistor, and a first diode, wherein the first input capacitor is parallelly connected between a first positive input end and a first negative input end, and the first negative input end is connected with a negative output end and is grounded; the drain of the first switch transistor is connected with the first positive input end and the gate receives a first driving signal; and the positive electrode of the first diode is connected with the first negative input end and the negative electrode is connected with the source of the first switch transistor. The B path comprises a second input capacitor, a second switch transistor, and a second diode, wherein the second input capacitor is parallelly connected between a second positive input end and a second negative input end, and the second positive input end is connected with a positive output end; the source of the second switch transistor is connected with the second negative input end and the gate receives a second driving signal; and the positive electrode of the second diode is connected with the drain of the second switch transistor and the negative electrode is connected with the second positive input end. The optimizer also comprises an inductor, an output capacitor, a bypass diode, a shoot-through switch transistor and a control center.
Description
Technical field
The present invention relates to parallel network power generation technical field, specifically, the present invention relates to a kind of photovoltaic module optimizer of photovoltaic system.
Background technology
Due to recyclability and the spatter property of solar energy, parallel network power generation technology is able to fast development.Optimizer structure is wherein a kind of efficient grid-connected scheme, and each photovoltaic module connects the optimizer of a lifting press, after the output of optimizer is connected by centralized inverter by energy transferring to electrical network.MPPT maximum power point tracking (MPPT) decoupling zero of photovoltaic array is the MPPT maximum power point tracking of each photovoltaic module by optimizer structure, while solution photovoltaic module does not mate and part covers problem, also can monitor the performance of photovoltaic module, facilitate the O&M of system.
As shown in Figure 1, existing optimizer accesses inverter after normally exporting series connection.And as shown in Figure 2, if optimizer breaks down, usually have the both positive and negative polarity short circuit that this optimizer exports by bypass diode, thus optimizer string is not disconnected, ensure to work on.Concrete, with reference to figure 3.Fig. 3 is a kind of optimizer of prior art, this optimizer be input as 2 tunnels, output is 1 tunnel.Two-way input PV1+/PV1-and PV2+/PV2-of the output separate connection optimizer of two photovoltaic module A and B.The corresponding two-way power conversion circuit of this two-way input.Export as OUT+ and OUT-, OUT+ and PV2+ are straight-through, OUT-and PV1-leads directly to.This optimizer at least comprises switching tube Q1 and Q2, control centre, inductance L, diode D1 and D2, exports bypass diode D3, and electric capacity C1, C2, Cout.Control centre sends drive singal Drive1 and Drive2 control Q1 and Q2 switch respectively.When this optimizer breaks down time, OUT+ and OUT-is by the direct conducting of bypass diode D3.Although this way can ensure that optimizer string does not disconnect and works on, photovoltaic module A and B that now this fault optimizer is corresponding no longer generates electricity, and loses the connection with inverter, thus loses the energy output of this photovoltaic module A and B.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of photovoltaic module optimizer, possesses fault and leads directly to function, makes when optimizer breaks down that photovoltaic module is by directly access group string, and work on generating.
For solving the problems of the technologies described above, the invention provides a kind of photovoltaic module optimizer, the input side of described photovoltaic module optimizer is divided into A road and two, B road branch road, is connected respectively with the first photovoltaic module A with the second photovoltaic module B;
Described A road comprises:
First input capacitance, is parallel between the first positive input terminal and the first negative input end, and described first negative input end is connected with the negative output terminal of described optimizer and common ground;
First switching tube, its drain electrode end is connected with described first positive input terminal, and its gate terminal is connected with the first drive singal; And
First diode, its positive terminal is connected with described first negative input end, and its negative pole end is connected with the source terminal of described first switching tube;
Described B road comprises:
Second input capacitance, is parallel between the second positive input terminal and the second negative input end, and described second positive input terminal is connected with the positive output end of described optimizer;
Second switch pipe, its source terminal is connected with described second negative input end, and its gate terminal is connected with the second drive singal; And
Second diode, its positive terminal is connected with the drain electrode end of described second switch pipe, and its negative pole end is connected with described second positive input terminal;
Described photovoltaic module optimizer also comprises:
Inductance L, its one end is connected with the source terminal of described first switching tube, and its other end is connected with the drain electrode end of described second switch pipe; And
Output capacitance, is parallel between described positive output end and described negative output terminal;
Bypass diode, its positive terminal is connected with described negative output terminal, and its negative pole end is connected with described positive output end;
Through swtich pipe, its source terminal is connected with described second negative input end, and its drain electrode end is connected with described first positive input terminal, and its gate terminal is connected with through swtich signal;
Control centre, for sending described first drive singal, described second drive singal and described through swtich signal.
According to one embodiment of present invention, described photovoltaic module optimizer also comprises through swtich drive circuit, one end of described through swtich drive circuit is connected with the gate terminal of described through swtich pipe, and the other end of described through swtich drive circuit is connected with described control centre.
According to one embodiment of present invention, described photovoltaic module optimizer also comprises telecommunication circuit, described telecommunication circuit connects described through swtich drive circuit, and described telecommunication circuit can transmit control signal to drive described through swtich pipe break-make to described through swtich drive circuit.
According to one embodiment of present invention, described through swtich pipe is conducting in its natural state, and described through swtich signal drives described through swtich pipe to disconnect.
According to one embodiment of present invention, described first switching tube, described second switch pipe and described through swtich pipe are NMOS tube.
According to one embodiment of present invention, described first drive singal and described second drive singal interlaced.
A kind of photovoltaic module optimizer that the present invention proposes possesses fault and leads directly to function, makes when optimizer breaks down that photovoltaic module is by directly access group string, and work on generating.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by passing through below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is the module diagram of the photovoltaic system of a kind of photovoltaic module optimizer of the prior art;
Fig. 2 is the module diagram of the photovoltaic module optimizer in Fig. 1 when breaking down;
Fig. 3 is the circuit diagram of optimizer of the prior art;
Fig. 4 is the circuit diagram of the photovoltaic module optimizer of the first embodiment of the present invention;
Fig. 5 is the circuit diagram of the photovoltaic module optimizer of the second embodiment of the present invention;
Fig. 6 is the circuit diagram of the photovoltaic module optimizer of the third embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiment and Figure of description, the invention will be further described; set forth more details in the following description so that fully understand the present invention; but the present invention obviously can implement with multiple this alternate manner described that is different from; those skilled in the art can when doing similar popularization, deduction without prejudice to when intension of the present invention according to practical situations, therefore should with content constraints protection scope of the present invention of this specific embodiment.
Fig. 4 is the circuit diagram of the photovoltaic module optimizer of the first embodiment of the present invention.It should be noted that these and follow-up other accompanying drawing all only exemplarily, it is not draw according to the condition of equal proportion, and should not be construed as limiting in this, as to the protection range of actual requirement of the present invention.As shown in Figure 4, the input side of photovoltaic module optimizer 300 is divided into A road and two, B road branch road (the latter half is A road, and the first half is B road), is connected respectively with the first photovoltaic module A with the second photovoltaic module B.
Wherein, this A road comprises: the first input capacitance Cin1, the first switching tube Q1 and the first diode D1.First input capacitance Cin1 is parallel between the first positive input terminal PV1+ and the first negative input end PV1-, and this first negative input end PV1-is connected with the negative output terminal OUT-of this optimizer 300 and common ground.First switching tube Q1 can be NMOS tube, and its drain electrode end is connected with this first positive input terminal PV1+, and its gate terminal is connected with the first drive singal Drive1.The positive terminal of the first diode D1 is connected with this first negative input end PV1-, and its negative pole end is connected with the source terminal of this first switching tube Q1.
This B road comprises: the second input capacitance Cin2, second switch pipe Q2 and the second diode D2.Second input capacitance Cin2 is parallel between the second positive input terminal PV2+ and the second negative input end PV2-, and this second positive input terminal PV2+ is connected with the positive output end OUT+ of this optimizer 300.Second switch pipe Q2 can be NMOS tube, and its source terminal is connected with this second negative input end PV2-, and its gate terminal is connected with the second drive singal Drive2.The positive terminal of the second diode D2 is connected with the drain electrode end of this second switch pipe Q2, and its negative pole end is connected with this second positive input terminal PV2+.
In addition, this optimizer 300 also comprises: inductance L, output capacitance Cout, bypass diode D3, through swtich pipe Q3 and control centre 310.One end of inductance L is connected with the source terminal of this first switching tube Q1, and its other end is connected with the drain electrode end of this second switch pipe Q2.Output capacitance Cout is parallel between this positive output end OUT+ and this negative output terminal OUT-.The positive terminal of bypass diode D3 is connected with negative output terminal OUT-, and its negative pole end is connected with positive output end OUT+.The source terminal of through swtich pipe Q3 is connected with the second negative input end PV2-, and its drain electrode end is connected with the first positive input terminal PV1+, and its gate terminal is connected with through swtich signal Drive3.Control centre 310 sends the first drive singal Drive1, the second drive singal Drive2 and through swtich signal Drive3, controls the first switching tube Q1, second switch pipe Q2 and through swtich pipe Q3 respectively.
A kind of optimizer that the present embodiment provides is on the optimizer basis of prior art in figure 3, has added a through swtich pipe Q3 between the second negative input end PV2-and the first positive input terminal PV1+, and through swtich pipe Q3 connects the control centre 310 of optimizer.The nature of through swtich pipe Q3 is conducting, and control centre 310 can send through swtich signal Drive3 to through swtich pipe Q3, and through swtich pipe Q3 is disconnected.When through swtich pipe Q3 is in the nature of conducting, make the second negative input end PV2-and the first positive input terminal PV1+ short circuit.After being now equivalent to photovoltaic module A and B series connection, then connect into group string.When optimizer 300 circuit is out of order time, through swtich signal Drive3 disappears, and through swtich pipe Q3 keeps the nature of conducting, thus makes optimizer enter into pass-through state.When optimizer 300 normally works time, control centre 310 produces the through swtich signal Drive3 disconnecting through swtich pipe Q3, and make through swtich pipe Q3 open circuit, namely the second negative input end PV2-and the first positive input terminal PV1+ opens a way.Now optimizer 300 is operated in normal electric power transition status, makes photovoltaic module A and B be operated in maximum power point.Through swtich signal Drive3 is designed to just power at optimizer 300 just first send through swtich signal Drive3, disconnects through swtich pipe Q3, starts the operation of other functions of optimizer 300 subsequently.
Fig. 5 is the circuit diagram of the photovoltaic module optimizer of the second embodiment of the present invention.Be with the distinctive points of the first embodiment, photovoltaic module optimizer 300 also comprises through swtich drive circuit 320.Through swtich drive circuit 320 one end is connected with the gate terminal of the 3rd switching tube Q3, and the other end of through swtich drive circuit 320 is connected with control centre 310.Through swtich drive circuit 320 receives the control signal of control centre 310, and sends through swtich signal Drive3 to through swtich pipe Q3.
Same, the nature of through swtich pipe Q3 is conducting.Control centre 310 transmits control signal to through swtich drive circuit 320, and through swtich drive circuit 320 sends through swtich signal Drive3 to through swtich pipe Q3, and through swtich pipe Q3 is disconnected.When through swtich pipe Q3 is in the nature of conducting, make the second negative input end PV2-and the first positive input terminal PV1+ short circuit, after being at this time equivalent to photovoltaic module A and B series connection, then connect into group string.When optimizer 300 circuit is out of order time, through swtich signal Drive3 disappears, and through swtich drive circuit 320 does not work, and through swtich pipe Q3 keeps the nature of conducting, thus makes optimizer 300 enter into pass-through state.When optimizer 300 normally works time, through swtich drive circuit 320 sends through swtich signal Drive3 to through swtich pipe Q3, make through swtich pipe Q3 open circuit, namely the second negative input end PV2-and the first positive input terminal PV1+ opens a way, at this time optimizer 300 is operated in normal electric power transition status, makes photovoltaic module A and B be operated in maximum power point.Through swtich signal Drive3 is designed to just power at optimizer 300 just first send through swtich signal Drive3, disconnects through swtich pipe Q3, starts the operation of other functions of optimizer 300 subsequently.
Fig. 6 is the circuit diagram of the photovoltaic module optimizer of the third embodiment of the present invention.Be with the distinctive points of the second embodiment, photovoltaic module optimizer also comprises telecommunication circuit 330, this telecommunication circuit 330 connects through swtich drive circuit 320, this telecommunication circuit 330 can obtain extraneous control signal, the control signal of through swtich drive circuit 320 received communication circuit 330, and send through swtich signal Drive3 to through swtich pipe Q3 and disconnect to drive through swtich pipe Q3.
Same, the nature of through swtich pipe Q3 is conducting.Telecommunication circuit 330 transmits control signal to through swtich drive circuit 320, and through swtich drive circuit 320 sends through swtich signal Drive3 to through swtich pipe Q3, and through swtich pipe Q3 is disconnected.When through swtich pipe Q3 is in the nature of conducting, make the second negative input end PV2-and the first positive input terminal PV1+ short circuit.After being now equivalent to photovoltaic module A and B series connection, then connect into group string.When the circuit of optimizer 300 is out of order time, through swtich signal Drive3 disappears, and through swtich drive circuit 320 does not work, and through swtich pipe Q3 keeps the nature of conducting, thus makes optimizer 300 enter into pass-through state.When optimizer 300 normally works time, telecommunication circuit 330 transmits control signal to through swtich drive circuit 320, through swtich drive circuit 320 sends through swtich signal Drive3 to through swtich pipe Q3, make through swtich pipe Q3 open circuit, namely the second negative input end PV2-and the first positive input terminal PV1+ opens a way, at this time optimizer 300 is operated in normal electric power transition status, makes photovoltaic module A+B be operated in maximum power point.
Photovoltaic system with optimizer 300 has some safety requirements, and one of them is when electric arc occurs, inverter is shut down, and the direct voltage inside photovoltaic system can not higher than 80V.When inverter is shut down, send the control centre 310 of signal and quit work, now through swtich pipe Q3 is in conducting state, and the output voltage of optimizer can be made to be that the open circuit voltage of two photovoltaic module A and B is added, may more than 80V.At this time can receive external signal by telecommunication circuit 330, transmit control signal to through swtich drive circuit 320, through swtich pipe Q3 is disconnected.The output of such photovoltaic module A and B and the output of optimizer disconnect, and the output voltage of optimizer is very low, close to 0V, can meet the requirement of photovoltaic system direct voltage restriction.
Preferably, the first switching tube Q1, second switch pipe Q2 and through swtich pipe Q3 are NMOS tube.
Preferably, be respectively used to drive this first drive singal Drive1 of this first switching tube Q1 and this second switch pipe Q2 and this second drive singal Drive2 interlaced, instead of synchronously.Adopt staggered drive singal, reduce the voltage and current ripple on inductance, reduce the parameter request of inductance, also reduce power consumption, improve the overall transformation efficiency of optimizer.
The photovoltaic module optimizer that the above embodiment of the present invention describes, possesses fault and leads directly to function, make the photovoltaic module of its correspondence when optimizer breaks down by the generating that works in directly access group string, thus can make full use of the energy output of photovoltaic module.
Although the present invention with preferred embodiment openly as above, it is not that any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment for limiting the present invention.Therefore, every content not departing from technical solution of the present invention, any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all fall within protection range that the claims in the present invention define.
Claims (6)
1. a photovoltaic module optimizer (300), the input side of described photovoltaic module optimizer (300) is divided into A road and two, B road branch road, is connected respectively with the first photovoltaic module (A) with the second photovoltaic module (B);
Described A road comprises:
First input capacitance (Cin1), be parallel between the first positive input terminal (PV1+) and the first negative input end (PV1-), described first negative input end (PV1-) is connected with the negative output terminal (OUT-) of described optimizer (300) and common ground;
First switching tube (Q1), its drain electrode end is connected with described first positive input terminal (PV1+), and its gate terminal is connected with the first drive singal (Drive1); And
First diode (D1), its positive terminal is connected with described first negative input end (PV1-), and its negative pole end is connected with the source terminal of described first switching tube (Q1);
Described B road comprises:
Second input capacitance (Cin2), be parallel between the second positive input terminal (PV2+) and the second negative input end (PV2-), described second positive input terminal (PV2+) is connected with the positive output end (OUT+) of described optimizer (300);
Second switch pipe (Q2), its source terminal is connected with described second negative input end (PV2-), and its gate terminal is connected with the second drive singal (Drive2); And
Second diode (D2), its positive terminal is connected with the drain electrode end of described second switch pipe (Q2), and its negative pole end is connected with described second positive input terminal (PV2+);
Described photovoltaic module optimizer (300) also comprises:
Inductance (L), its one end is connected with the source terminal of described first switching tube (Q1), and its other end is connected with the drain electrode end of described second switch pipe (Q2); And
Output capacitance (Cout), is parallel between described positive output end (OUT+) and described negative output terminal (OUT-);
Bypass diode (D3), its positive terminal is connected with described negative output terminal (OUT-), and its negative pole end is connected with described positive output end (OUT+);
Through swtich pipe (Q3), its source terminal is connected with described second negative input end (PV2-), its drain electrode end is connected with described first positive input terminal (PV1+), and its gate terminal is connected with through swtich signal (Drive3);
Control centre (310), for sending described first drive singal (Drive1), described second drive singal (Drive2) and described through swtich signal (Drive3).
2. photovoltaic module optimizer (300) according to claim 1, it is characterized in that, described photovoltaic module optimizer (300) also comprises through swtich drive circuit (320), one end of described through swtich drive circuit (320) is connected to provide described through swtich signal with the gate terminal of described through swtich pipe (Q3), and the other end of described through swtich drive circuit (320) is connected with described control centre (310).
3. photovoltaic module optimizer (300) according to claim 2, it is characterized in that, described photovoltaic module optimizer (300) also comprises telecommunication circuit (330), described telecommunication circuit (330) connects described through swtich drive circuit (320), and described telecommunication circuit (330) can transmit control signal to drive described through swtich pipe (Q3) break-make to described through swtich drive circuit (320).
4. according to the arbitrary described photovoltaic module optimizer (300) of claims 1 to 3, it is characterized in that, described through swtich pipe (Q3) is conducting in its natural state, and described through swtich signal (Drive3) drives described through swtich pipe (Q3) to disconnect.
5. photovoltaic module optimizer (300) according to claim 1, is characterized in that, described first switching tube (Q1), described second switch pipe (Q2) and described through swtich pipe (Q3) are NMOS tube.
6. photovoltaic module optimizer (300) according to claim 1, is characterized in that, described first drive singal (Drive1) and described second drive singal (Drive2) interlaced.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978476A (en) * | 2016-06-03 | 2016-09-28 | 丰郅(上海)新能源科技有限公司 | Inverter |
| CN106330088A (en) * | 2016-09-27 | 2017-01-11 | 浙江佳明天和缘光伏科技有限公司 | Three-body photovoltaic power generation direct-current optimizer with direct-through devices |
| WO2021142906A1 (en) * | 2020-01-14 | 2021-07-22 | 海宁昱能电子有限公司 | Photovoltaic module turn-off apparatus |
| WO2021243501A1 (en) * | 2020-06-01 | 2021-12-09 | 华为数字能源技术有限公司 | Fault protection apparatus |
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| US20110188276A1 (en) * | 2010-01-29 | 2011-08-04 | Diehl Ako Stiftung & Co. Kg | Circuit arrangement having a boost converter, and inverter circuit having such a circuit arrangement |
| EP2515424A2 (en) * | 2011-04-20 | 2012-10-24 | Diehl AKO Stiftung & Co. KG | Direct current converter |
| CN104201885A (en) * | 2014-09-15 | 2014-12-10 | 浙江昱能科技有限公司 | Photovoltaic system optimizer and power switching circuit thereof |
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2015
- 2015-11-26 CN CN201510844141.6A patent/CN105262138B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110188276A1 (en) * | 2010-01-29 | 2011-08-04 | Diehl Ako Stiftung & Co. Kg | Circuit arrangement having a boost converter, and inverter circuit having such a circuit arrangement |
| EP2515424A2 (en) * | 2011-04-20 | 2012-10-24 | Diehl AKO Stiftung & Co. KG | Direct current converter |
| CN104201885A (en) * | 2014-09-15 | 2014-12-10 | 浙江昱能科技有限公司 | Photovoltaic system optimizer and power switching circuit thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978476A (en) * | 2016-06-03 | 2016-09-28 | 丰郅(上海)新能源科技有限公司 | Inverter |
| CN106330088A (en) * | 2016-09-27 | 2017-01-11 | 浙江佳明天和缘光伏科技有限公司 | Three-body photovoltaic power generation direct-current optimizer with direct-through devices |
| WO2021142906A1 (en) * | 2020-01-14 | 2021-07-22 | 海宁昱能电子有限公司 | Photovoltaic module turn-off apparatus |
| WO2021243501A1 (en) * | 2020-06-01 | 2021-12-09 | 华为数字能源技术有限公司 | Fault protection apparatus |
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| CN105262138B (en) | 2017-12-19 |
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