CN104702206A - Photovoltaic power generation system using bypass type direct current converters - Google Patents
Photovoltaic power generation system using bypass type direct current converters Download PDFInfo
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- CN104702206A CN104702206A CN201510158457.XA CN201510158457A CN104702206A CN 104702206 A CN104702206 A CN 104702206A CN 201510158457 A CN201510158457 A CN 201510158457A CN 104702206 A CN104702206 A CN 104702206A
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- 238000010248 power generation Methods 0.000 title abstract 4
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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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
Abstract
The invention provides a photovoltaic power generation system using bypass type direct current converters. The photovoltaic power generation system using the bypass type direct current converters comprises a plurality of solar photovoltaic panels, the direct current converters and an inverter, wherein a cable string which is input by the inverter is divided into a first substring and a second substring; the first substring is formed by connecting output positive electrodes of the solar photovoltaic panels and output negative electrodes of the solar photovoltaic panels in series, the output of each solar photovoltaic panel is correspondingly connected with the output of a direct current converter, and the second substring is formed by connecting input positive electrodes of the direct current converters and input negative electrodes of the direct current converters in series. By means of the photovoltaic power generation system, the switching power can be lowered, the design of electric switching circuits is simplified, the cost is lowered, and the reliability is improved.
Description
Technical field
The present invention relates to distributed generation technology field, specifically, the present invention relates to and a kind ofly use bypass type direct current transducer and the high-efficient photovoltaic system based on this bypass type direct current transducer.
Background technology
Fig. 1 is the connected mode schematic diagram in a kind of photovoltaic generating system of the prior art between solar energy photovoltaic panel and inverter.As shown in Figure 1, after solar energy photovoltaic panel (PV) is one another in series usually, input inverter, produce alternating current and be connected to the grid or charger use.The output current of the photovoltaic panel of series connection limits by the photovoltaic panel of minimum current, and that is often block photovoltaic panel is not operated in maximum power point, does not export maximum power.
Existing tandem type converter structure is wherein a kind of scheme making each photovoltaic panel be operated in maximum power point.Fig. 2 be in another kind of photovoltaic generating system of the prior art solar energy photovoltaic panel through tandem type transducer and the schematic diagram be connected between inverter.As shown in Figure 2, each photovoltaic panel (PV) connects the transducer of a lifting press, by the output of transducer connect after by centralized inverter by energy transferring to electrical network (not shown).The MPPT maximum power point tracking decoupling zero of photovoltaic array is the MPPT maximum power point tracking of each photovoltaic panel by tandem type converter structure, solves photovoltaic panel and does not mate and partly cover problem.
But for this scheme, whole power outputs of corresponding photovoltaic panel are changed by every platform transducer, connected by the output of transducer and import inverter.The power conversion circuit of transducer will process whole power of photovoltaic panel output, namely require that the design of corresponding power, comprises energy storage device, switching device etc., cause high cost.Power loss is also corresponding to this power, causes the problems such as corresponding power loss, thermal losses.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of photovoltaic generating system using bypass type direct current transducer, can reduce transfer power, simplifies the design of power conversion circuit, reduces costs and improve reliability.
For solving the problems of the technologies described above, the invention provides a kind of photovoltaic generating system using bypass type direct current transducer, comprising multiple solar energy photovoltaic panel, multiple stage direct current transducer and inverter;
Wherein, the cable string inputting described inverter is divided into the first substring and the second substring; Described first substring is mutually connected by the both positive and negative polarity of multiple described solar energy photovoltaic panel output to be formed, and the output of each described solar energy photovoltaic panel also connects the output of a described direct current transducer accordingly; Described second substring is mutually connected by the both positive and negative polarity of direct current transducer input described in multiple stage to be formed.
Alternatively, described direct current transducer system is directly integrated in a photovoltaic module; Described photovoltaic module comprises described solar energy photovoltaic panel, terminal box and frame.
Alternatively, solar energy photovoltaic panel described in each comprises multi-disc solar-energy photo-voltaic cell sheet and glass plate.
Alternatively, solar-energy photo-voltaic cell sheet composition string described in multi-disc or output lead later in parallel are to described direct current transducer, and connect the first leading-out terminal and second leading-out terminal of described direct current transducer, described first leading-out terminal and described second leading-out terminal of adjacent described photovoltaic module are connected mutually, form described first substring.
Alternatively, described direct current transducer comprises photovoltaic electric current detection circuit, photovoltaic voltage testing circuit, power conversion circuit and electric power conversion control circuit;
Wherein, the output of described solar-energy photo-voltaic cell sheet connects the output of described power conversion circuit; Described photovoltaic electric current detection circuit and described photovoltaic voltage testing circuit detect photovoltaic current signal and the photovoltaic voltage signal of described solar-energy photo-voltaic cell sheet respectively, and give described electric power conversion control circuit by the described photovoltaic current signal that detects and described photovoltaic voltage Signal transmissions, by to the control of described power conversion circuit and the feedback of signal, described photovoltaic generating system is made to be operated in maximum power point.
Alternatively, the input of described power conversion circuit comprises three terminal and the 4th leading-out terminal of described direct current transducer, and described three terminal of adjacent described photovoltaic module and described 4th leading-out terminal are connected mutually, form described second substring.
Alternatively, described direct current transducer also comprises accessory power supply, is connected with described second leading-out terminal.
Alternatively, described direct current transducer system is independent of a photovoltaic module; Described photovoltaic module comprises described solar energy photovoltaic panel, terminal box and frame.
Alternatively, each electrode of output of described photovoltaic module installs two joints, and one in two described joints is the series connection as adjacent described photovoltaic module, and another is the out splice going splice with connecting described direct current transducer; The described input adapter of described direct current transducer is connected mutually; At the output cable place of described photovoltaic module, current inductor being installed, detecting photovoltaic current signal, being transferred to described direct current transducer for controlling.
Alternatively, the way of realization of described joint is that two joints are directly with by described output cable, or connects the joint of described photovoltaic module with 1:2 crossover sub.
Compared with prior art, the present invention has the following advantages:
The invention discloses a kind of photovoltaic generating system using novel bypass type direct current transducer, realize MPPT maximum power point tracking and the monitoring function of independent solar photovoltaic plate.The output of solar energy photovoltaic panel is connected by the present invention, and connects a kind of output of Novel DC transducer simultaneously, and the input string of direct current transducer is unified into goes here and there and connects the input of inverter.The difference of the maximum power that the power that direct current transducer is changed is solar energy photovoltaic panel and series-connected solar photovoltaic panel power, adopt very lower powered DC converting circuit, transfer power can be reduced, thus simplify the design of power conversion circuit, achieve simple designs, reduce costs, raise the efficiency and reliability.
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 connected mode schematic diagram in a kind of photovoltaic generating system of the prior art between solar energy photovoltaic panel and inverter;
Fig. 2 be in another kind of photovoltaic generating system of the prior art solar energy photovoltaic panel through tandem type transducer and the schematic diagram be connected between inverter;
Fig. 3 is the structural representation of the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 4 is the CURRENT DISTRIBUTION schematic diagram in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 5 is the voltage's distribiuting schematic diagram in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 6 a is the electric current of photovoltaic generating system when photovoltaic module mates completely, the voltage's distribiuting schematic diagram of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 6 b is the electric current of photovoltaic generating system in a hypographous situation of photovoltaic module, the voltage's distribiuting schematic diagram of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 7 is the internal module schematic diagram being directly integrated in the direct current transducer in a photovoltaic module in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention;
Fig. 8 is the joint connection diagram independent of the direct current transducer of a photovoltaic module in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, 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. 3 is the structural representation of the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.It should be noted that this 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 3, this photovoltaic generating system mainly comprises multiple solar energy photovoltaic panel PV1 ... the direct current transducer 1 of PVn, multiple stage bypass type ... n and inverter 401.Wherein, the cable string S inputting inverter 401 is divided into the first substring ps and the second substring cs.First substring ps is by multiple solar energy photovoltaic panel PV1 ... the both positive and negative polarity that PVn exports is connected is formationed mutually, and while each solar energy photovoltaic panel PV1 ... the output of PVn also connects a direct current transducer 1 accordingly ... the output of n.Second substring cs is by multiple stage direct current transducer 1 ... the both positive and negative polarity of n input is connected formation mutually, this direct current transducer 1 ... n can be described as the direct current transducer of bypass type.Solar energy photovoltaic panel PV1 ... PVn has n, corresponding direct current transducer 1 ... n is also n, n be greater than 1 natural number.
Fig. 4 is the CURRENT DISTRIBUTION schematic diagram in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.The input current of inverter 401 is Is, and the first substring cable current of the first substring ps is Ips, and the second substring cable current of the second substring cs is Ics, Is=Ips+Ics.Solar energy photovoltaic panel PV1 ... the electric current I pvi of PVn is that the electric current I psi of the first substring ps adds direct current transducer 1 ... the output current Icoi of n, namely Ipvi=Ipsi+Icoi.Input current Icii with the second substring cable current Ics of direct current transducer 1...n is identical.
Fig. 5 is the voltage's distribiuting schematic diagram in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.The input voltage of inverter 401 is Vs, and the total voltage of the first substring ps is Vps, and the total voltage of the second substring cs is Vcs, Vs=Vps=Vcs.Solar energy photovoltaic panel PV1 ... the output voltage Vpv1 of PVn ... the output voltage Vpv1 of Vpvn and direct current transducer ... Vpvn is identical, is all that the summation of Vpvi, Vpvi equals the first substring voltage cable Vps, i.e. Vps=Vpv1+Vpv2+ ... Vpvi+ ... + Vpvn; And the input voltage of direct current transducer 1...n is Vci1 ... the summation of Vci2, Vci equals the second substring voltage Vcs, i.e. Vcs=Vci1+Vci2+ ... Vcii+ ... + Vcin.
Fig. 6 a is the electric current of photovoltaic generating system when photovoltaic module mates completely, the voltage's distribiuting schematic diagram of the use bypass type direct current transducer of one embodiment of the invention.Suppose in photovoltaic generating system, there are 1 string, 15 solar energy photovoltaic panel PV1 ... PVn (i.e. n=15) is maximum power point operating current is 8A, and maximum power point operating voltage is 30V.All solar energy photovoltaic panel PV1 ... PVn is operated in maximum power point operating current 8A, and maximum power point voltage is all 30V.As shown in Figure 6 a, the electric current entering inverter 401 is 8A, and the cable current Ips of the first substring ps is 8A, all solar energy photovoltaic panel PV1 ... electric current I pv1 in PVn ... Ipvi is also 8A.At this moment direct current transducer 1 ... n does not have output current, and switched mode power converter all disconnects.The cable current Ics of the second substring cs is 0A, and electric current I ci and Ico is 0.Each solar energy photovoltaic panel PV1 ... the output voltage of PVn is also all 30V.At this time the total voltage of inverter 401 input voltage and the first substring ps and the second substring cs is all solar energy photovoltaic panel PV1 ... the summation of PVn output voltage, is assumed to be 15 solar energy photovoltaic panels, and its total voltage is 15 × 30=450V.Vs＝Vps＝Vcs＝450V。
Fig. 6 b is the electric current of photovoltaic generating system in a hypographous situation of photovoltaic module, the voltage's distribiuting schematic diagram of the use bypass type direct current transducer of one embodiment of the invention.As shown in Figure 6 b, if when solar energy photovoltaic panel PV1 has one piece of shade, the inner maximum power point electric current I pv1 of solar energy photovoltaic panel PV1 reduces to 7.5A by 8A, and maximum power point voltage becomes Vpv1=25V.Other solar energy photovoltaic panel PV2 ... the inner maximum power point electric current of PVn or 8A, Ipvi (i=2 ~ n, n=15)=8A, and maximum power point voltage or 30V, Ppvi (i=2 ~ n, n=15)=30V.At this moment the solar energy photovoltaic panel PV1 of the first substring ps ... cable current Ips between PVn, by hypographous solar energy photovoltaic panel PV1 current limit, is Ips=7.5A.At this time the electric current I pv1 of solar energy photovoltaic panel PV1 all flows through solar energy photovoltaic panel PV1, and the output current Ico1 of corresponding direct current transducer 1 is 0.And other solar energy photovoltaic panel PV2 ... electric current or 8A in PVn, so the direct current transducer 2 of correspondence ... the output current Icoi=Ipvi-Ipsi=8A-7.5=0.5A of n.The voltage summation of the first substring ps is 25+30 × 14=445V.Because the first substring ps and the second substring cs is in parallel, voltage is identical, so the total voltage of the second substring cs is also 445V.
Vcs＝Vci1+Vci2+…Vcii+…+Vcin＝445V
And the short circuit of direct current transducer 1 input, input voltage is 0,14 direct current transducers 2 that such second substring cs is remaining ... total voltage on n (n=15) is 445V, and because they are identical, respective voltage Vci is 445/14=31.8V.
The output voltage of direct current transducer 1 is Vpv1=25V, and output current is Ics1=0.The output voltage of other direct current transducers i (2 ~ n, n=15) is 30V, and output current is 0.5A, power P i is 30 × 0.5=15W.The input voltage Vci=31.8V of direct current transducer i.Suppose that direct current transducer i does not have power loss, input current Ici=Pi/Vci=15/31.8=0.47A.The electric current I ps=7.5A of the first substring ps, the electric current I cs=0.47A of the second substring cs, the electric current I s=Ips+Ics=7.97A that inverter 401 inputs, voltage Vs=445V.At this time, all solar energy photovoltaic panel PV1 ... PVn is operated in respective maximum power point, and the gross power of inverter 401 is Is × Vs=7.97A × 445A=3547W.If do not use direct current transducer 1 ... n, but simple photovoltaic module series connection, so the gross power of inverter 401 is 7.5A × 25V × 15=2812W.
Fig. 7 is the internal module schematic diagram being directly integrated in the direct current transducer in a photovoltaic module in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.The i.e. direct current transducer 1 of one embodiment of the invention ... n can be that to be directly integrated in a photovoltaic module (not completely illustrate) inner, and as shown in Figure 7, photovoltaic module at least comprises solar energy photovoltaic panel, terminal box and frame.Each solar energy photovoltaic panel comprises again multi-disc solar-energy photo-voltaic cell sheet 701 and glass plate.Multi-disc solar-energy photo-voltaic cell sheet 701 composition string or output lead later in parallel to direct current transducer 1...n, and connect the first leading-out terminal PV+ and the second leading-out terminal PV-of direct current transducer 1...n; First leading-out terminal PV+ and the second leading-out terminal PV-of adjacent photovoltaic assembly connect mutually, form previously described first substring ps.
As shown in Figure 7, direct current transducer 1...n includes but not limited to photovoltaic electric current detection circuit 702, photovoltaic voltage testing circuit 703, power conversion circuit 704 and electric power conversion control circuit 705.Wherein, the output of solar-energy photo-voltaic cell sheet 701 connects the output of power conversion circuit 704; Photovoltaic electric current detection circuit 702 and photovoltaic voltage testing circuit 703 detect photovoltaic current signal and the photovoltaic voltage signal of solar-energy photo-voltaic cell sheet 701 respectively, and by the photovoltaic current signal that detects and photovoltaic voltage Signal transmissions to electric power conversion control circuit 705, by to the control of power conversion circuit 704 and the feedback of signal, photovoltaic generating system is made to be operated in maximum power point.The input of power conversion circuit 704 comprises the sub-Con+ of three terminal and the 4th leading-out terminal Con-of direct current transducer 1...n, the sub-Con+ of three terminal and the 4th leading-out terminal Con-of adjacent photovoltaic assembly connect mutually, form previously described second substring cs.In addition, direct current transducer 1...n also comprises accessory power supply 706, is connected with the second leading-out terminal PV-.
Fig. 8 is the joint connection diagram independent of the direct current transducer of a photovoltaic module in the photovoltaic generating system of the use bypass type direct current transducer of one embodiment of the invention.Namely the direct current transducer 1...n of another embodiment of the present invention also independent of a photovoltaic module (not illustrating completely), can be connected use with the photovoltaic module of standard.Photovoltaic module also can comprise solar energy photovoltaic panel, terminal box and frame.As shown in Figure 8, each electrode of the output of photovoltaic module installs two joints 801.The way of realization of this joint 801 can be that two joints are directly with by output cable, or connects the joint of photovoltaic module with 1:2 crossover sub.One in these two joints 801 is the series connection as adjacent photovoltaic assembly, and another is the out splice going splice with connecting direct current transducer 1...n.The input adapter of direct current transducer 1...n is connected mutually.At the output cable place of photovoltaic module, current inductor 802 being installed, detecting photovoltaic current signal, being transferred to direct current transducer 1...n for controlling.
In sum, the invention discloses a kind of photovoltaic generating system using novel bypass type direct current transducer, realize MPPT maximum power point tracking and the monitoring function of independent solar photovoltaic plate.The output of solar energy photovoltaic panel is connected by the present invention, and connects a kind of output of Novel DC transducer simultaneously, and the input string of direct current transducer is unified into goes here and there and connects the input of inverter.The difference of the maximum power that the power that direct current transducer is changed is solar energy photovoltaic panel and series-connected solar photovoltaic panel power, adopt very lower powered DC converting circuit, transfer power can be reduced, thus simplify the design of power conversion circuit, achieve simple designs, reduce costs, raise the efficiency and reliability.
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 (10)
1. use a photovoltaic generating system for bypass type direct current transducer, it is characterized in that, comprise multiple solar energy photovoltaic panel (PV1 ... PVn), multiple stage direct current transducer (1 ... n) with inverter (401);
Wherein, the cable string (S) inputting described inverter (401) is divided into the first substring (ps) and the second substring (cs); Described first substring (ps) is by multiple described solar energy photovoltaic panel (PV1 ... PVn) both positive and negative polarity exported is connected formation mutually, and each described solar energy photovoltaic panel (PV1 ... PVn) output also connects a described direct current transducer (1 accordingly ... n) output; Described second substring (cs) is by direct current transducer described in multiple stage (1 ... n) both positive and negative polarity inputted is connected formation mutually.
2. photovoltaic generating system according to claim 1, is characterized in that, described direct current transducer (1...n) is directly be integrated in a photovoltaic module; Described photovoltaic module comprises described solar energy photovoltaic panel (PV1 ... PVn), terminal box and frame.
3. photovoltaic generating system according to claim 2, is characterized in that, solar energy photovoltaic panel (PV1 described in each ... PVn) multi-disc solar-energy photo-voltaic cell sheet (701) and glass plate is comprised.
4. photovoltaic generating system according to claim 3, it is characterized in that, solar-energy photo-voltaic cell sheet (701) composition string described in multi-disc or output lead later in parallel are to described direct current transducer (1...n), and connect the first leading-out terminal (PV+) and second leading-out terminal (PV-) of described direct current transducer (1...n), described first leading-out terminal (PV+) of adjacent described photovoltaic module and described second leading-out terminal (PV-) are connected mutually, form described first substring (ps).
5. photovoltaic generating system according to claim 4, it is characterized in that, described direct current transducer (1...n) comprises photovoltaic electric current detection circuit (702), photovoltaic voltage testing circuit (703), power conversion circuit (704) and electric power conversion control circuit (705);
Wherein, the output of described solar-energy photo-voltaic cell sheet (701) connects the output of described power conversion circuit (704); Described photovoltaic electric current detection circuit (702) and described photovoltaic voltage testing circuit (703) detect photovoltaic current signal and the photovoltaic voltage signal of described solar-energy photo-voltaic cell sheet (701) respectively, and give described electric power conversion control circuit (705) by the described photovoltaic current signal that detects and described photovoltaic voltage Signal transmissions, by to the control of described power conversion circuit (704) and the feedback of signal, described photovoltaic generating system is made to be operated in maximum power point.
6. photovoltaic generating system according to claim 5, it is characterized in that, the input of described power conversion circuit (704) comprises three terminal (Con+) and the 4th leading-out terminal (Con-) of described direct current transducer (1...n), described three terminal (Con+) and described 4th leading-out terminal (Con-) of adjacent described photovoltaic module are connected mutually, form described second substring (cs).
7. photovoltaic generating system according to claim 6, is characterized in that, described direct current transducer (1...n) also comprises accessory power supply (706), is connected with described second leading-out terminal (PV-).
8. photovoltaic generating system according to claim 1, is characterized in that, described direct current transducer (1...n) is independent of a photovoltaic module; Described photovoltaic module comprises described solar energy photovoltaic panel (PV1 ... PVn), terminal box and frame.
9. photovoltaic generating system according to claim 8, it is characterized in that, the each electrode of output of described photovoltaic module installs two joints (801), one in two described joints (801) is the series connection as adjacent described photovoltaic module, and another is the out splice going splice with connecting described direct current transducer (1...n); The described input adapter of described direct current transducer (1...n) is connected mutually; At the output cable place of described photovoltaic module, current inductor (802) being installed, detecting photovoltaic current signal, being transferred to described direct current transducer (1...n) for controlling.
10. photovoltaic generating system according to claim 9, is characterized in that, the way of realization of described joint (801) is that two joints are directly with by described output cable, or connects the joint of described photovoltaic module with 1:2 crossover sub.
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| CN110098796A (en) * | 2019-03-20 | 2019-08-06 | 邓晓帆 | A kind of connection type of photovoltaic tiles |
| WO2020014861A1 (en) * | 2018-07-17 | 2020-01-23 | 浙江英达威芯电子有限公司 | Photovoltaic system and photovoltaic module thereof |
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