CN215267629U - Direct current wiring tool for field testing efficiency of string type photovoltaic inverter - Google Patents
Direct current wiring tool for field testing efficiency of string type photovoltaic inverter Download PDFInfo
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- CN215267629U CN215267629U CN202121815917.9U CN202121815917U CN215267629U CN 215267629 U CN215267629 U CN 215267629U CN 202121815917 U CN202121815917 U CN 202121815917U CN 215267629 U CN215267629 U CN 215267629U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The direct current wiring tool for the field efficiency test of the string type photovoltaic inverter comprises an insulating electric box, wherein a plurality of photovoltaic string positive/negative input ports and photovoltaic string positive/negative output ports are arranged on the insulating electric box; an anode/cathode bus bar is arranged in the insulating electric box, a diode is connected to the anode input port of each photovoltaic string, the cathode of the diode is connected with the anode bus bar, and an analog-digital fuse is connected between the anode bus bar and the anode output port of each photovoltaic string; and the cathode input port of each photovoltaic group string is connected with a cathode bus bar, and the cathode bus bar is connected with the cathode output port of each photovoltaic group string. The utility model discloses can realize the field test to photovoltaic group string inverter efficiency, the whole box is in the enclosed state in the convenient and test procedure of wiring, and the security is higher, has solved in the past and has carried out various wiring problems in the group string inverter efficiency test procedure at the power station scene, has reduced photovoltaic module and has appeared the probability of damaging in the test procedure.
Description
Technical Field
The utility model belongs to the technical field of the photovoltaic inverter efficiency test, especially, relate to a group's string formula photovoltaic inverter efficiency field test direct current wiring frock.
Background
A photovoltaic inverter is a power conditioning device composed of semiconductor devices, mainly used for converting dc power into ac power, and generally composed of a boost circuit and an inverter bridge circuit.
The boosting circuit boosts the direct-current voltage of the solar battery to the direct-current voltage required by the output control of the inverter; the inverter bridge circuit equivalently converts the boosted direct-current voltage into alternating-current voltage with common frequency.
When the photovoltaic string power generation system is used, the inverter is provided with a plurality of input ports, and the photovoltaic string output power is distributed to each input port of the inverter.
The efficiency of the inverter is an important parameter for the performance of the inverter and also relates to whether the power converted by the inverter can be incorporated into a power grid, so that the efficiency detection of the inverter has important significance.
In the prior art, the layout of the internal circuit and each component of the photovoltaic string inverter is compact, the total voltage and total current cannot be collected from the internal direct current collection position of the inverter in the process of carrying out the efficiency test of the string inverter on a power station site, a plurality of string branches are generally arranged at the external direct current input end of the string inverter, and some direct current branches are up to 20.
The number of testing channels of the power analyzer in the current market cannot be met, so that a plurality of cables are directly connected in parallel in one common field testing process, a plurality of branch circuits are separated from two ends of the simple tool, one end of the simple tool is connected with a photovoltaic string in the testing process, the other end of the simple tool is connected with a direct-current end of an inverter, and therefore the parallel connection of the positive electrode and the negative electrode is completed before each photovoltaic string is input into the inverter, and the testing of voltage and current is facilitated.
With the increasing of the power of the string-type photovoltaic inverter in recent years, the simple wiring mode has certain potential safety hazard to testers and field equipment, for example, output voltages of a plurality of photovoltaic strings under the same string-type inverter have certain deviation, even the deviation of the output voltages of the strings is large due to the abnormal operation of individual photovoltaic modules, so that the risk of circulating current exists when the plurality of photovoltaic strings are simply connected in parallel, and the photovoltaic modules can be damaged under severe conditions; the direct division of a plurality of branches into the inverter after parallel connection may also cause the excessive current of a single branch of the input inverter, which may damage the inverter; after parallel connection and confluence, high-voltage and high-current cables are exposed to threaten the safety of personnel.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wiring is convenient, application safety factor is high group's string formula photovoltaic inverter efficiency field test direct current wiring frock.
In order to solve the technical problem, the utility model provides a following technical scheme: the direct current wiring tool for the field test of the efficiency of the string type photovoltaic inverter comprises an insulating electric box, wherein a plurality of photovoltaic string positive electrode input ports, photovoltaic string negative electrode input ports, photovoltaic string positive electrode output ports and photovoltaic string negative electrode output ports are arranged on the insulating electric box; an anode bus bar and a cathode bus bar are arranged in the insulating electric box, a diode is connected to the anode input port of each photovoltaic group string, the anode of the diode is connected with the anode input port of the photovoltaic group string, the cathode of the diode is connected with the anode bus bar, and the anode bus bar is connected with the anode output port of each photovoltaic group string; and the cathode input port of each photovoltaic group string is connected with a cathode bus bar, and the cathode bus bar is connected with the cathode output port of each photovoltaic group string.
The positive bus bar and the negative bus bar are both H-shaped and respectively comprise an input plate, an output plate and a connecting plate connected between the output plate and the output plate, and input terminals are uniformly distributed on the input plate; output terminals are uniformly distributed on the output plate.
An analog-digital fuse is connected between the output terminal of the positive busbar and the positive output port of each photovoltaic string; the input terminal of the anode bus bar is connected with the cathode of the diode; and the input terminal of the negative busbar is connected with the negative input port of each photovoltaic group string, and the output terminal of the negative busbar is connected with the negative output port of each photovoltaic group string.
The current parameter of the modular fuse is 12A-25A; the diode is an anti-reverse diode, and the specification parameter of the anti-reverse diode is 25A/1500V.
The positive busbar connecting plate and the negative busbar connecting plate are both provided with voltage test fixture connecting holes, and the insulating electric box is provided with a test wire positive electrode wire inlet hole and a test wire negative electrode wire inlet hole in a penetrating manner; the test wire anode wire inlet hole and the test wire cathode wire inlet hole are both arranged on the bottom of the insulated electric box in a penetrating mode, the test wire anode wire inlet hole is located below the anode bus bar, and the test wire cathode wire inlet hole is located below the cathode bus bar.
The direct current cables are connected between the positive input port of the photovoltaic string and the diode, between the diode and the positive busbar, between the positive busbar and the modular fuse, between the modular fuse and the positive input port of the photovoltaic string, between the negative input port of the photovoltaic string and the negative busbar and between the negative busbar and the negative output port of the photovoltaic string.
The type of the direct current cable is as follows: 1 x 6mm 2.
The middle part in the insulating electrical box is provided with an insulating separation blade, and the positive busbar and the negative busbar are respectively positioned at two sides of the insulating separation blade.
The insulating electric box and the insulating separation blade are made of plastics.
Through the technical scheme, the beneficial effects of the utility model are that: (1) through the modular fuse that establishes ties between each branch road of positive busbar to the positive input end of inverter, can audio-visual understanding each branch road break-make in the test procedure, avoid the partial input port of inverter to appear unusually leading to getting into the electric current of other input ports and surpassing the threshold value, and then play the guard action to being surveyed the inverter. (2) The arranged diodes avoid damage to the photovoltaic modules caused by the circulation phenomenon when the photovoltaic modules with different voltages are connected in series and in parallel. (3) The whole parallel connection and protection circuit is arranged in the insulated electric box, and the whole box body is in a closed state in the test process, so that the safety is higher. (4) And multiple input and output branches can be arranged to meet the connection of the series inverters with different power groups. (5) The tool is convenient to wire, the whole box body is in a closed state in the testing process, the safety is high, and various wiring problems in the process of testing the efficiency of the string type inverter on the power station site in the past are solved.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention;
FIG. 2 is a back view of the insulated electric box of the present invention;
FIG. 3 is a perspective view of FIG. 1;
fig. 4 is a schematic diagram of the present invention.
Detailed Description
As shown in fig. 1 to 4, the field test direct current wiring tool for the efficiency of the string photovoltaic inverter is used for field test of the efficiency of the string photovoltaic inverter.
When the field test of the efficiency of the photovoltaic inverter is carried out, a plurality of photovoltaic groups are required to be connected in series and in parallel, and then shunt is carried out after the photovoltaic groups are connected in parallel. In the embodiment, the tool for realizing series-parallel connection and confluence of the plurality of photovoltaic modules and then series connection is provided, so that field testing is facilitated.
The wiring tool comprises an insulating electrical box 1, wherein a plurality of photovoltaic string positive electrode input ports 12, photovoltaic string negative electrode input ports 12, photovoltaic string positive electrode output ports 13 and photovoltaic string negative electrode output ports 13 are arranged on the insulating electrical box 1. This embodiment is through setting up insulating electronic box 1 with whole parallelly connected and protection circuit arrange insulating electronic box 1 in, insulating electronic box 1 is in the closed condition among the test process, and the security is higher.
The positive input port 12 of each photovoltaic string and the negative input port 12 of each photovoltaic string are respectively and uniformly distributed at the lower part of the insulated electrical box 1 and are used for connecting the positive electrode and the negative electrode of the photovoltaic string. The positive output port 13 of each photovoltaic string and the negative output port 13 of each photovoltaic string are respectively and uniformly distributed on the upper part of the insulated electric box 1 and are used for connecting the positive electrode and the negative electrode of the inverter.
The insulation electric box 1 is internally provided with a positive bus bar 2 and a negative bus bar 3, the positive bus bar 2 and the negative bus bar 3 are made of copper, the positive bus bar 2 and the negative bus bar 3 are both in an I shape, the positive bus bar 2 and the negative bus bar 3 both comprise an input plate, an output plate and a connecting plate 7 connected between the input plate and the output plate, wherein input terminals 5 are uniformly distributed on the input plate; output terminals 4 are uniformly distributed on the output board, current is collected on the input board through an input terminal 5 and enters the output board through the connecting board, and branch separation is realized through the output terminals 4 of the output board.
Voltage test fixture connection holes 6 are formed in the connecting plates 7 of the positive busbar 2 and the negative busbar 3, and when the positive and negative voltage test fixtures of an external power analyzer are connected with the corresponding positive and negative busbar voltage test fixture connection holes 6 respectively, so that the voltage value on the connecting plates 7 is tested; the current sensor is directly sleeved on the connecting plate 7, so that the current value on the connecting plate 7 can be conveniently tested.
Through the access of outside voltage test anchor clamps and current sensor, can gather voltage and current value on the connecting plate 7, obtain efficiency, in this embodiment, the realization mode that obtains inverter efficiency according to voltage test anchor clamps and current sensor is ripe prior art, and this embodiment does not relate to this technical scheme's improvement, so this embodiment is no longer repeated.
In the wiring process, in order to quickly and accurately perform wiring, positive and negative pole marks are arranged on the connecting plate 7, wherein a negative pole mark 8 is arranged on the connecting plate 7 of the negative pole busbar 3.
Run through on the insulating electronic box 1 and be equipped with anodal entrance hole 11 of test wire and test wire negative pole entrance hole 10, test wire anodal entrance hole 11 and test wire negative pole entrance hole 10 all run through and lie in insulating electronic box 1 bottom, and test wire anodal entrance hole 11 is located anodal busbar 2 below, and test wire negative pole entrance hole 10 is located 3 below of negative busbar.
The external voltage test wire enters the insulated electric box 1 through the test wire anode wire inlet hole 11 and the test wire cathode wire inlet hole 10 and is connected with the voltage test clamp connection hole 6 in the insulated electric box 1, which is positioned on the anode busbar 2 and the cathode busbar 3, so that voltage test is realized, the external current test wire enters the insulated electric box 1 through the test wire anode wire inlet hole 11, and the current sensor is sleeved on the connecting plate 7 at the anode busbar 2, so that current test is realized.
In order to ensure the safety of electricity utilization, the middle part in the insulating electric box 1 is provided with an insulating separation blade 9, the anode bus bar 2 and the cathode bus bar 3 are respectively positioned at two sides of the insulating separation blade 9, wherein the insulating electric box 1 and the insulating separation blade 9 are made of plastics.
The diode 17 is connected to the positive input port 12 of each photovoltaic string, the diode 17 is an anti-reverse diode 17, and the specification parameter of the anti-reverse diode 17 is 25A/1500V. By arranging the diode 17, the photovoltaic modules with different voltages can be prevented from being damaged by the circulation phenomenon when the photovoltaic modules are connected in series and in parallel.
The anode of the diode 17 is connected with the anode input port 12 of the photovoltaic string, the cathode of the diode 17 is connected with the input terminal 5 of the anode busbar 2, the output terminal 4 of the anode busbar 2 and the anode output port 13 of each photovoltaic string are connected with the modular fuses 16, the modular fuses 16 are commercially available products, and the current parameters of the modular fuses 16 selected in the embodiment are 12A-25A. In this embodiment, the on-off of each branch can be intuitively known in the test process by setting the modular fuse 16, and meanwhile, the current entering other input ports due to the abnormality of part of the input ports of the inverter is prevented from exceeding the threshold, so that the tested inverter is protected.
The negative input port 12 of each photovoltaic string is connected to the input terminal 5 of the negative busbar 3, and the output terminal 4 of the negative busbar 3 is connected to the negative output port 13 of each photovoltaic string.
Wherein, between anodal input port 12 of photovoltaic group cluster and diode 17, between input terminal 5 of diode 17 and anodal busbar 2, between output terminal 4 and the modular fuse 16 of anodal busbar 2, between modular fuse 16 and the anodal input port 12 of photovoltaic group cluster, all be connected through direct current cable 15 between input terminal 5 of photovoltaic group cluster negative pole input port 12 and negative busbar 3 and between output terminal 4 and the photovoltaic group cluster negative pole output port 13 of negative busbar 3, here, direct current cable 15's model is: 1 x 6mm2。
Each photovoltaic string positive input port 12 passes through 1 × 6mm2The direct current cables 15 are respectively connected with an anti-reverse diode 17 in series and then are connected with the direct current cables by 1 × 6mm2The direct current cable 15 is connected into an I-shaped positive busbar 2, and after the positive electrodes of all branches are connected in parallel and converged, the direct current cable is connected from 1 x 6mm2The direct current cable 15 leads out a plurality of branches from the I-shaped positive busbar 2, and after each led-out branch is respectively connected with an analog fuse 16 in series, the branches are further connected with 1 × 6mm2The direct current cable 15 is connected with the negative electrode output port 13 of the photovoltaic group string; each photovoltaic group string negative input port 12 passes through 1 × 6mm2The direct current cable 15 is directly connected into the I-shaped negative electrode bus bar 3, and after the parallel connection and the confluence of the negative electrodes are finished, the direct current cable is connected with the negative electrode bus bar 3 by 1-6 mm2The direct current cable 15 leads out a plurality of branches from the I-shaped cathode bus bar 3 to be directly connected with the cathode output port 13 of the photovoltaic string.
The working process is as follows: before testing, firstly, the negative pole of a voltage test wire in a direct current test channel of a power analyzer sold in the market enters from a test wire negative pole wire inlet hole 10, then the voltage test wire enters into a voltage test fixture connecting hole 6 on a negative pole bus bar 3, the positive pole of the voltage test wire enters from a test wire positive pole wire inlet hole 11, then the voltage test fixture connecting hole 6 on a positive pole bus bar 2 is accessed, a current test wire directly enters from the test wire positive pole wire inlet hole 11, then a current sensor is sleeved on a connecting plate 7 of the I-shaped positive pole bus bar 2, and after the access of the voltage test wire and the current sensor of the direct current test channel of the power analyzer is finished, a door cover plate 14 of an insulating electric box 1 is closed, so that the safety of the test process is ensured.
Then all photovoltaic strings of the direct current input end of the photovoltaic string inverter to be tested are disconnected with the inverter, then the positive pole of each disconnected photovoltaic string is connected to the positive pole input port 12 of the photovoltaic string, the negative pole of each string is connected to the negative pole input port 12 of the photovoltaic string, the negative pole output port 13 of the photovoltaic string is connected with the negative pole of the direct current input end of the inverter to be tested, the positive pole output port 13 of the photovoltaic string is connected with the positive pole of the direct current input end of the inverter to be tested, the direct current input end of the photovoltaic string inverter efficiency field test is connected, and then the alternating current test channel voltage and current test line of the power analyzer is directly connected with the alternating current output end line of the inverter to be tested, so that the field test work of the efficiency of the string photovoltaic inverter can be started.
The utility model discloses can realize the field test to photovoltaic group string inverter efficiency, the whole box is in the enclosed state in the convenient and test procedure of wiring, and the security is higher, has solved in the past and has carried out various wiring problems in the group string inverter efficiency test procedure at the power station scene, has reduced photovoltaic module and has appeared the probability of damaging in the test procedure.
Claims (10)
1. Group string formula photovoltaic inverter efficiency field test direct current wiring frock, its characterized in that: the photovoltaic power generation device comprises an insulating electrical box, wherein a plurality of photovoltaic string anode input ports, photovoltaic string cathode input ports, photovoltaic string anode output ports and photovoltaic string cathode output ports are arranged on the insulating electrical box; an anode bus bar and a cathode bus bar are arranged in the insulating electric box, a diode is connected to the anode input port of each photovoltaic group string, the anode of the diode is connected with the anode input port of the photovoltaic group string, the cathode of the diode is connected with the anode bus bar, and the anode bus bar is connected with the anode output port of each photovoltaic group string; and the cathode input port of each photovoltaic group string is connected with a cathode bus bar, and the cathode bus bar is connected with the cathode output port of each photovoltaic group string.
2. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 1, characterized in that: the positive bus bar and the negative bus bar are I-shaped, and respectively comprise an input plate, an output plate and a connecting plate connected between the output plate and the output plate, and input terminals are uniformly distributed on the input plate; output terminals are uniformly distributed on the output plate.
3. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 2, characterized in that: an analog-digital fuse is connected between the output terminal of the positive busbar and the positive output port of each photovoltaic string; the input terminal of the anode bus bar is connected with the cathode of the diode; and the input terminal of the negative busbar is connected with the negative input port of each photovoltaic group string, and the output terminal of the negative busbar is connected with the negative output port of each photovoltaic group string.
4. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 3, characterized in that: the current parameter of the modular fuse is 12A-25A; the diode is an anti-reverse diode, and the specification parameter of the anti-reverse diode is 25A/1500V.
5. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 4, characterized in that: and the positive busbar connecting plate and the negative busbar connecting plate are both provided with voltage test clamp connecting holes.
6. The field test direct-current wiring tool for the efficiency of the string-type photovoltaic inverter according to any one of claims 1 to 5, wherein: a test wire anode wire inlet hole and a test wire cathode wire inlet hole are arranged on the insulating electric box in a penetrating manner; the test wire anode wire inlet hole and the test wire cathode wire inlet hole are both arranged on the bottom of the insulated electric box in a penetrating mode, the test wire anode wire inlet hole is located below the anode bus bar, and the test wire cathode wire inlet hole is located below the cathode bus bar.
7. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 6, characterized in that: the direct current cables are connected between the positive input port of the photovoltaic string and the diode, between the diode and the positive busbar, between the positive busbar and the modular fuse, between the modular fuse and the positive input port of the photovoltaic string, between the negative input port of the photovoltaic string and the negative busbar and between the negative busbar and the negative output port of the photovoltaic string.
8. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 7, characterized in that: the type of the direct current cable is as follows: 1 x 6mm2。
9. The field test direct-current wiring tool for the efficiency of the string-type photovoltaic inverter of claim 1 or 8, characterized in that: the middle part in the insulating electrical box is provided with an insulating separation blade, and the positive bus bar and the negative bus bar are respectively positioned at two sides of the insulating separation blade.
10. The string-type photovoltaic inverter efficiency field test direct current wiring tool of claim 9, characterized in that: the insulating electric box and the insulating separation blade are made of plastics.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121815917.9U CN215267629U (en) | 2021-08-05 | 2021-08-05 | Direct current wiring tool for field testing efficiency of string type photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121815917.9U CN215267629U (en) | 2021-08-05 | 2021-08-05 | Direct current wiring tool for field testing efficiency of string type photovoltaic inverter |
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| CN215267629U true CN215267629U (en) | 2021-12-21 |
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| CN202121815917.9U Active CN215267629U (en) | 2021-08-05 | 2021-08-05 | Direct current wiring tool for field testing efficiency of string type photovoltaic inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336334A (en) * | 2022-01-25 | 2022-04-12 | 上能电气股份有限公司 | Direct current power distribution unit applied to photovoltaic inverter and photovoltaic inverter |
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2021
- 2021-08-05 CN CN202121815917.9U patent/CN215267629U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336334A (en) * | 2022-01-25 | 2022-04-12 | 上能电气股份有限公司 | Direct current power distribution unit applied to photovoltaic inverter and photovoltaic inverter |
| CN114336334B (en) * | 2022-01-25 | 2023-08-25 | 上能电气股份有限公司 | Direct-current power distribution unit applied to photovoltaic inverter and photovoltaic inverter |
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