CN204948022U - A kind of photovoltaic combiner box and photovoltaic plant - Google Patents

A kind of photovoltaic combiner box and photovoltaic plant Download PDF

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Publication number
CN204948022U
CN204948022U CN201520680530.5U CN201520680530U CN204948022U CN 204948022 U CN204948022 U CN 204948022U CN 201520680530 U CN201520680530 U CN 201520680530U CN 204948022 U CN204948022 U CN 204948022U
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China
Prior art keywords
photovoltaic
group string
circuit
combiner box
photovoltaic group
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CN201520680530.5U
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Inventor
曹仁贤
李浩源
杨本和
申凯
李晓迅
江鹏
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

This application discloses a kind of photovoltaic combiner box and photovoltaic plant; described photovoltaic combiner box has the main circuit for the positive negative output of Cheng Yilu of the positive negative output of n road photovoltaic group string being confluxed; wherein; described main circuit is provided with n switching circuit and n diode; n >=1; concrete: photovoltaic group string described in each road is connected a described switching circuit separately, and the inverse parallel described diode separately of photovoltaic group string described in each road, achieve photovoltaic group string reversal connection protection function.

Description

A kind of photovoltaic combiner box and photovoltaic plant
Technical field
The utility model relates to technical field of photovoltaic power generation, more particularly, relates to a kind of photovoltaic combiner box and photovoltaic plant.
Background technology
Photovoltaic combiner box is the device for the positive negative output of Cheng Yilu of the positive negative output of multichannel photovoltaic group string being confluxed, its main circuit as shown in Figure 1, positive pole PV1+ ~ the PVn+ of photovoltaic group string PV1 ~ PVn accumulates a road PV+, and the negative pole PV1-~ PVn-of photovoltaic group string PV1 ~ PVn accumulates a road PV-.
In photovoltaic plant practice of construction process, owing to needing the photovoltaic group string One's name is legion of access, may occur that a certain road or several roads photovoltaic group string both positive and negative polarity connect anti-situation, connect the state that anti-photovoltaic group string is connected again with both positive and negative polarity after making photovoltaic combiner box main circuit become the photovoltaic group connection in series-parallel of normal wiring, now both positive and negative polarity connects on anti-photovoltaic group string and can flow through very large electric current, easily cause photovoltaic group string overcurrent to burn, and then cause the generation of fire.
Utility model content
In view of this, the utility model provides a kind of photovoltaic combiner box and photovoltaic plant, to realize photovoltaic group string reversal connection protection function.
A kind of photovoltaic combiner box, has the main circuit for the positive negative output of Cheng Yilu of the positive negative output of n road photovoltaic group string being confluxed, wherein, described main circuit is provided with n switching circuit and n diode, n >=1, concrete:
Photovoltaic group string described in each road is connected a described switching circuit separately, and the inverse parallel described diode separately of photovoltaic group string described in each road.
Wherein, switching circuit described in each is connected on the positive pole of photovoltaic group string described in a road separately, or switching circuit described in each is connected on the negative pole of photovoltaic group string described in a road separately.
Wherein, described switching circuit is fuse, relay, circuit breaker or crystal switch pipe.
Wherein, switching circuit described in each comprises two switch elements, and described two switch elements are connected on the positive and negative electrode of photovoltaic group string described in a road respectively.
Wherein, described switch element is fuse, relay, circuit breaker or crystal switch pipe.
Alternatively, described main circuit is also provided with n short-circuit protection device, wherein: diode described in each is connected a described short-circuit protection device separately.
Wherein, described short-circuit protection device is switching device or resistance.
Wherein, described switching device is fuse, relay, circuit breaker or crystal switch pipe.
Wherein, the electronic device described main circuit arranged adopts design on board level, is all integrated on same printed circuit board.
A kind of photovoltaic plant, comprising: photovoltaic array, contravariant equipment and connect the photovoltaic combiner box of described photovoltaic array and described contravariant equipment, and wherein, described photovoltaic combiner box is above-mentioned any one photovoltaic combiner box disclosed.
As can be seen from above-mentioned technical scheme, the utility model is on the basis of existing photovoltaic combiner box main circuit, for each road photovoltaic group string is connected a switching circuit separately, when certain road photovoltaic group string both positive and negative polarity connects inverse time, the switching circuit of series connection with it can disconnect automatically because of overcurrent, achieves photovoltaic group string reverse connecting protection; But consider that described switching circuit easily causes arcing phenomenon on fire after disconnecting, therefore the utility model is also each road photovoltaic group string inverse parallel diode separately, make both positive and negative polarity connect anti-photovoltaic group string and can enter short-circuit condition after the switching circuit of series connection with it disconnects, to avoid arcing phenomenon on fire occurs, and both positive and negative polarity connects the short circuit current that anti-photovoltaic group string flows only through self, can not damage because of overcurrent.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of photovoltaic combiner box main circuit structure schematic diagram disclosed in prior art;
Fig. 2 is a kind of photovoltaic combiner box main circuit structure schematic diagram disclosed in the utility model embodiment;
Fig. 3 a kind of only 3 road photovoltaic groups disclosed in prior art are connected in series into photovoltaic plant and a road photovoltaic group string both positive and negative polarity connects the photovoltaic combiner box main circuit structure schematic diagram of inverse time;
Fig. 4 is the photovoltaic combiner box main circuit structure schematic diagram of the utility model embodiment on the basis of Fig. 3 after insertion switch circuit;
Fig. 5 is the photovoltaic combiner box main circuit structure schematic diagram after the utility model embodiment introduces diode on the basis of Fig. 4;
The short circuit current schematic diagram of photovoltaic group string PV3 of Fig. 6 for producing in the main circuit of photovoltaic combiner box shown in Fig. 5;
Fig. 7 is the utility model embodiment another photovoltaic combiner box main circuit structure schematic diagram disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 2; the utility model embodiment discloses a kind of photovoltaic combiner box; to realize photovoltaic group string reversal connection protection function; this photovoltaic combiner box has the main circuit for the positive negative output of Cheng Yilu of being confluxed by photovoltaic group string PV1 ~ PVn (n >=1); wherein; described main circuit is provided with switching circuit F1 ~ Fn and diode D1 ~ Dn, concrete: photovoltaic group string described in each road is connected a switching circuit separately, and the inverse parallel diode separately of photovoltaic group string described in each road.
Switching circuit F1 ~ Fn does not limit to the serial connection position on photovoltaic group string PV1 ~ PVn.For switching circuit F1, Fig. 2 is only connected on the positive pole of photovoltaic group string PV1 exemplarily with switching circuit F1, but in addition, switching circuit F1 also can be connected on the negative pole of photovoltaic group string PV1, or switching circuit F1 also can be divided into two switch elements, these two switch elements are connected on the positive and negative electrode of photovoltaic group string PV1 respectively.
Wherein, switching circuit F1 ~ Fn can adopt fuse, relay, circuit breaker or crystal switch pipe etc. to have the device of switching function.Same, described switch element can adopt fuse, relay, circuit breaker or crystal switch pipe etc.
The present embodiment is on the basis of existing photovoltaic combiner box main circuit, for each road photovoltaic group string is connected a switching circuit separately, when certain road photovoltaic group string both positive and negative polarity connects inverse time, the switching circuit of series connection with it can disconnect automatically because of overcurrent, achieves photovoltaic group string reverse connecting protection; But consider that described switching circuit easily causes arcing phenomenon on fire after disconnecting, therefore the present embodiment is also each road photovoltaic group string inverse parallel diode separately, make both positive and negative polarity connect anti-photovoltaic group string and can enter short-circuit condition after the switching circuit of series connection with it disconnects, to avoid arcing phenomenon on fire occurs, and both positive and negative polarity connects the short circuit current that anti-photovoltaic group string flows only through self, can not damage because of overcurrent.
In order to technical scheme disclosed in clearer description the present embodiment, access photovoltaic plants for only 3 road photovoltaic group string PV1 ~ PV3 below, the principle of the present embodiment based on existing techniques in realizing photovoltaic group string reversal connection protection function is described.
In existing photovoltaic combiner box, suppose the reversal connection of photovoltaic group string PV3 both positive and negative polarity, as shown in Figure 3, to connect with photovoltaic group string PV1 again after being then equivalent to the first parallel connection of photovoltaic group string PV1 and photovoltaic group string #2 and each photovoltaic group string is all in short-circuit condition, now the short circuit current I1 of photovoltaic group string PV1 and the short circuit current I2 of photovoltaic group string #2 collects and flows through photovoltaic group string PV3, that is, flow through the electric current I 3=I1+I2 of photovoltaic group string PV3, very likely cause photovoltaic group string PV3 overcurrent to burn.
On the basis of Fig. 3, want to accomplish overcurrent protection, can to connect separately a switching circuit for photovoltaic group string PV1 ~ PV3, switching circuit F1 ~ F3 as shown in Figure 4.Being still hypothesis photovoltaic group string PV3 both positive and negative polarity connects instead, the switching circuit F3 then connected with photovoltaic group string PV3 can disconnect automatically when overcurrent I3 produces, photovoltaic group string PV3 overcurrent is prevented to burn, but its two ends can produce the overvoltage far above system ceiling voltage after switching circuit F3 disconnects, very easily cause arcing phenomenon on fire, reason is:
First by PV+, PV3+, PV-tri-the circuit node at place be designated as a, b, c respectively, then V ab=V ac+ V cb, wherein, V abequal switching circuit F3 both end voltage, V acequal photovoltaic group string PV1 in parallel with photovoltaic group string #2 after voltage, V cbequal photovoltaic group string PV3 both end voltage; After switching circuit F3 disconnects, photovoltaic group string #1 is in parallel with photovoltaic group string #2 and be in open-circuit condition, and photovoltaic group string #3 is also in open-circuit condition, supposes that each photovoltaic group string open circuit voltage is equal to V open, then switching circuit F3 disconnects its both end voltage V rear abequal 2*V open, be the overvoltage far above photovoltaic system ceiling voltage, very easily cause arcing phenomenon on fire.
Therefore, on the basis of scheme shown in Fig. 4, the present embodiment is also photovoltaic group string PV1 ~ PV3 inverse parallel diode separately, diode D1 ~ D3 as shown in Figure 5.When the PV3 both positive and negative polarity reversal connection of photovoltaic group string, the switching circuit F3 connected with photovoltaic group string PV3 automatically can disconnect after overcurrent I3 produces; After F3 disconnects, with the antiparallel diode D3 of photovoltaic group string PV3 conducting because bearing the forward voltage of photovoltaic group string PV3; After D3 conducting, photovoltaic group string PV3 is in short-circuit condition, D3 flows through the short circuit current I4 of photovoltaic group string PV3, as shown in Figure 6, and now V cb≈ 0, so V ab=V ac+ V cb≈ V ac, that is, F3 disconnect after its both end voltage equal photovoltaic group string PV1 in parallel with photovoltaic group string #2 after open circuit voltage, suppose that each photovoltaic group string open circuit voltage is equal to V open, then switching circuit F3 disconnects its both end voltage V rear abequal V open, this voltage does not exceed photovoltaic system ceiling voltage, and therefore F3 can not cause arcing phenomenon on fire after disconnecting.Further, photovoltaic group string PV3 flows only through the short circuit current I4 of self, its current value is less, and photovoltaic group string PV3 overcurrent can not be caused to burn phenomenon.
Alternatively, the main circuit of photovoltaic combiner box shown in Fig. 2 is also provided with short-circuit protection device B1 ~ Bn, and as shown in Figure 7, diode described in each is connected a described short-circuit protection device separately.
Wherein, described short-circuit protection device is switching device or resistance.Described switching device can be fuse, relay, circuit breaker or crystal switch pipe.
Suppose that photovoltaic group string PV3 both positive and negative polarity connects instead, according to analysis above, the switching circuit F3 connected with photovoltaic group string PV3 will disconnect, subsequently with the antiparallel diode D3 of photovoltaic group string PV3 by conducting, photovoltaic group string PV3 is by diode D3 short circuit, now photovoltaic group string PV3 is in short-circuit condition always, diode D3 can flow through the short circuit current of photovoltaic group string PV3 always and generate heat, if now for diode D3 connects the switching device of an appropriate size, so after photovoltaic group string PV3 short circuit, this switching device can disconnect automatically, thus photovoltaic group string PV3 just can be made to be in open-circuit condition, diode D3 is avoided to flow through the short circuit current of photovoltaic group string PV3 always and generate heat, or also this switching device can be replaced with resistance, after switching circuit F3 disconnects, photovoltaic group string PV3 is limited the electric current flowing through diode D3 by this resistance, avoids diode D3 equally and flows through the short circuit current of photovoltaic group string PV3 and generate heat always.
Alternatively, for any one photovoltaic combiner box disclosed in the present embodiment, the electronic device that its main circuit is arranged adopts design on board level, is all integrated on same printed circuit board, is convenient to maintenance, easy for installation, cost-saving effect to reach.For Fig. 2, the electronic devices such as switching circuit F1 ~ Fn, diode D1 ~ Dn are all integrated on one piece of printed circuit board; For Fig. 7, the electronic devices such as switching circuit F1 ~ Fn, diode D1 ~ Dn, short-circuit protection device B1 ~ Bn are all integrated on one piece of printed circuit board.
In sum, the utility model on the basis of existing photovoltaic combiner box main circuit, for each road photovoltaic group string is connected a switching circuit separately, when certain road photovoltaic group string both positive and negative polarity connects inverse time, the switching circuit of series connection with it can disconnect automatically because of overcurrent, achieves photovoltaic group string reverse connecting protection; But consider that described switching circuit easily causes arcing phenomenon on fire after disconnecting, therefore the utility model is also each road photovoltaic group string inverse parallel diode separately, make both positive and negative polarity connect anti-photovoltaic group string and can enter short-circuit condition after the switching circuit of series connection with it disconnects, to avoid arcing phenomenon on fire occurs, and both positive and negative polarity connects the short circuit current that anti-photovoltaic group string flows only through self, can not damage because of overcurrent.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. a photovoltaic combiner box, has the main circuit for the positive negative output of Cheng Yilu of the positive negative output of n road photovoltaic group string being confluxed, it is characterized in that, described main circuit is provided with n switching circuit and n diode, n >=1, wherein:
Photovoltaic group string described in each road is connected a described switching circuit separately, and the inverse parallel described diode separately of photovoltaic group string described in each road.
2. photovoltaic combiner box according to claim 1, is characterized in that, switching circuit described in each is connected on the positive pole of photovoltaic group string described in a road separately, or switching circuit described in each is connected on the negative pole of photovoltaic group string described in a road separately.
3. photovoltaic combiner box according to claim 2, is characterized in that, described switching circuit is fuse, relay, circuit breaker or crystal switch pipe.
4. photovoltaic combiner box according to claim 1, is characterized in that, switching circuit described in each comprises two switch elements, and described two switch elements are connected on the positive and negative electrode of photovoltaic group string described in a road respectively.
5. photovoltaic combiner box according to claim 4, is characterized in that, described switch element is fuse, relay, circuit breaker or crystal switch pipe.
6. photovoltaic combiner box according to claim 1, is characterized in that, described main circuit is also provided with n short-circuit protection device, wherein:
Diode described in each is connected a described short-circuit protection device separately.
7. photovoltaic combiner box according to claim 6, is characterized in that, described short-circuit protection device is switching device or resistance.
8. photovoltaic combiner box according to claim 7, is characterized in that, described switching device is fuse, relay, circuit breaker or crystal switch pipe.
9. the photovoltaic combiner box according to any one of claim 1-8, is characterized in that, the electronic device that described main circuit is arranged adopts design on board level, is all integrated on same printed circuit board.
10. a photovoltaic plant, comprising: photovoltaic array, contravariant equipment and connect the photovoltaic combiner box of described photovoltaic array and described contravariant equipment, it is characterized in that, the photovoltaic combiner box of described photovoltaic combiner box according to any one of claim 1-9.
CN201520680530.5U 2015-09-02 2015-09-02 A kind of photovoltaic combiner box and photovoltaic plant Active CN204948022U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105977952A (en) * 2016-06-16 2016-09-28 阳光电源股份有限公司 Anti-reverse connection protection circuit
CN106026229A (en) * 2016-05-27 2016-10-12 宁德时代新能源科技股份有限公司 Current shunting apparatus and operating method therefor
CN109510450A (en) * 2018-12-27 2019-03-22 阳光电源股份有限公司 A kind of reverse connecting protection method and photovoltaic generating system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106026229A (en) * 2016-05-27 2016-10-12 宁德时代新能源科技股份有限公司 Current shunting apparatus and operating method therefor
CN105977952A (en) * 2016-06-16 2016-09-28 阳光电源股份有限公司 Anti-reverse connection protection circuit
CN105977952B (en) * 2016-06-16 2019-08-13 阳光电源股份有限公司 A kind of reverse connection prevention protection circuit
CN109510450A (en) * 2018-12-27 2019-03-22 阳光电源股份有限公司 A kind of reverse connecting protection method and photovoltaic generating system
CN109510450B (en) * 2018-12-27 2020-05-22 阳光电源股份有限公司 Reverse connection protection method and photovoltaic power generation system

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