CN204334372U - MW class group string data inversion boosting device - Google Patents

MW class group string data inversion boosting device Download PDF

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Publication number
CN204334372U
CN204334372U CN201520027746.1U CN201520027746U CN204334372U CN 204334372 U CN204334372 U CN 204334372U CN 201520027746 U CN201520027746 U CN 201520027746U CN 204334372 U CN204334372 U CN 204334372U
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Prior art keywords
inverter
group
string
group string
string inverter
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CN201520027746.1U
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邵楚雯
邓宇
曲海波
沈彬
徐何君
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Shanghai Electric Power Design Institute Co Ltd
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Shanghai Electric Power Design Institute 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
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model discloses a kind of MW class group string data inversion boosting device, comprise some group string inverter parallel with one another, some interchange header boxs, one two winding transformer, the DC side of each described group of string inverter connects described photovoltaic module, every 6 or 7 described group of string inverter are as row, group string formation one group of inverter array, the interchange outlet side of each inverter array accesses respectively described in one and exchanges header box, those exchange header box rear access one low-pressure side bus parallel with one another, the low-pressure side of described two winding transformer is accessed by a master switch, the power organizing string inverter described in every platform is 28kVA, the quantity of described group of string inverter is 38.The utility model, compared with existing large-scale inverter increasing apparatus, reduces loss, improves the conversion efficiency for photovoltaic cell.

Description

MW class group string data inversion boosting device
Technical field
The utility model relates to a kind of photovoltaic plant transmission of electric energy field, particularly a kind of MW class group string inverter increasing apparatus, comprises group string inverter, exchanges header box and two winding transformer etc.
Background technology
Conventional photovoltaic power station adopts large-scale inverter increasing apparatus, and every megawatt configures two 500 kilowatts of DC-to-AC converter, 10, two 500 kilowatts of DC distribution cabinet devices, 20,12 direct current conflux case devices 30 and a transformer with split winding device 40.
But, existing large-scale inverter increasing apparatus due to be adopt Large Copacity concentrate inverting, single inverter needs the capacity following the tracks of collection 500 kilowatts of photovoltaic battery panels, cell panel capacity is large, add that geographic range is wide, absorb luminous energy uneven, the energy output difference of photovoltaic battery panel is large, easily cause single inverter can not carry out following the tracks of according to monolithic photovoltaic battery panel capacity the problem of generating, therefore extremely waste electric energy.
Utility model content
Because the above-mentioned defect of prior art, the utility model provides a kind of energy minimizing group string mismatch ratio, and then a kind of MW class group string data inversion boosting device of loss of assembly energy output can be reduced, it comprises: some parallel with one another and group string inverter of converting direct-current power into alternating-current power for being produced by photovoltaic module, some interchange header boxs for the alternating current of conversion is confluxed, one for being become the alternating current of group string inverter generation into the two winding transformer of high pressure by low pressure, the DC side of each described group of string inverter connects described photovoltaic module, every 6 or 7 described group of string inverter are as row, group string formation one group of inverter array, the interchange outlet side of each described inverter array accesses respectively described in one and exchanges header box, those exchange header box rear access one low-pressure side bus parallel with one another, the low-pressure side of described two winding transformer is accessed by a master switch, wherein, the power organizing string inverter described in every platform is 28kVA, the quantity of described group of string inverter is 38.
Inverter in this programme is logical refers to low power inverter, for direct current energy (photovoltaic cell) being transformed into alternating current (be generally 220V, 50Hz is sinusoidal wave).The automatically controlled part of inverter is made up of inverter bridge, control logic and filter circuit.Group string inverter is the advantage of having got concentrated inversion and the inversion of group string, avoids its shortcoming, can be applicable to the photo-voltaic power generation station of MW class.
In group string inverter, contain different independent power peak and follow the tracks of and the transducer of DC-to-DC, these direct currents convert alternating current by a common direct current to the inverter of interchange, and receive on electrical network.
Photovoltaic module, the group string (as: east, Nan Hexi) of different directions, the different inclination angles of the different rated values of photovoltaic group string (as: different manufacturer of different rated power, package count that often group string is different, assembly etc.), different sizes or different technologies or hide shadow, can be connected on a common inverter, each group string is all operated in their respective maximum power peak simultaneously.
Meanwhile, the loss that the length of direct current cables reduces, affected by the screening shadow between group string and causes due to the difference between group string reduces to minimum.
Therefore, this programme adopts low power group of string inverter, every megawatts of power tracking module can reach 120 tunnels, 50 times are added than existing large-scale inverter increasing apparatus, improve power tracking effect, through experiment test, the utility model adds the energy output of about 3% than the large-scale inverter of existing 500kW.
Meanwhile, the following range of the electricity generation module that single inverter unit is corresponding-such as photovoltaic module reduces, and decreases group string mismatch ratio, thus decreases the loss of assembly energy output.
In this programme, the DC side of the automatically controlled part of this group string inverter, group string inverter and photovoltaic module coupling part, organize exchanging outlet side and all can adopting the electronic control technology of existing inverter in prior art to realize with the coupling part exchanging header box of string inverter, the non-improvement place of the present utility model of electronic control technology part of this inverter itself, and therefore not to repeat here.
In certain embodiments, the high-pressure side of described two winding transformer is connected to the grid.
In certain embodiments, the DC side of each described group of string inverter all accesses described header box by an alternating-current switch.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains each preferred embodiment of the utility model.
The beneficial effects of the utility model:
The utility model improves power tracking effect, and the electricity generation module that single inverter unit is corresponding simultaneously--assembly scope reduces, and decreases group string mismatch ratio, then decreases the loss of assembly energy output.
Be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation, to understand the purpose of this utility model, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is existing MW class large-scale inverter increasing apparatus structure chart.
Fig. 2 is MW class small-power group string data inversion boosting structure drawing of device of the present utility model.
Description of reference numerals:
Existing: 500 kilowatts of DC-to-AC converter 10, DC distribution cabinet device 20, direct current conflux case device 30, transformer with split winding devices 40
The utility model: group string inverter 1, interchange header box 2, low-pressure side bus 3, two winding transformer 4, master switch 5, alternating-current switch 6
Embodiment
Lift several preferred embodiment below, and come by reference to the accompanying drawings clearlyer intactly the utility model to be described.
Embodiment
Photovoltaic generation, as a kind of green energy resource, advocates energy savings.The MW class group string data small-sized inverter increasing apparatus that the present embodiment provides all has very large advantage in efficiency, loss or cost.
The purpose of this utility model is achieved through the following technical solutions: the MW class group string inverter increasing apparatus that the utility model provides, comprising low power group of string inverter of the converting direct-current power into alternating-current power for being produced by photovoltaic module, being used for the interchange header box confluxed by the alternating current of conversion and the two winding transformer etc. being used for the alternating current of group string inverter generation to be become by low pressure high pressure, wherein, the power organizing string inverter described in every platform is 28kVA, and the quantity of described group of string inverter is 38.Therefore, the group string inverter in this programme is also known as small-sized inverter.
As shown in Figure 2, the DC side of each described group of string inverter 1 connects described photovoltaic module (not shown), every 6 or 7 described group of string inverter 1 are as row, group string formation one group of inverter array, the interchange outlet side of each described inverter array accesses the described interchange header box 2 of a correspondence respectively, those exchange header box 2 rear access one low-pressure side bus 3 parallel with one another, accessed the low-pressure side of described two winding transformer 4 by a master switch 5, the high-pressure side of described two winding transformer 4 is connected to the grid (not shown).
In order to increase protection, the DC side of each described group of string inverter is all by an alternating-current switch 6 incoming transport header box 6 again.
The automatically controlled part of inverter is made up of inverter bridge, control logic and filter circuit.Group string inverter is the advantage of having got concentrated inversion and the inversion of group string, avoids its shortcoming, can be applicable to the photo-voltaic power generation station of MW class.In many group string inverters, contain different independent power peaks and follow the tracks of and the transducer of DC-to-DC, these direct currents convert alternating current by a common direct current to the inverter of interchange, and receive on electrical network.Photovoltaic module, the group string (as: east, Nan Hexi) of different directions, the different inclination angles of the different rated values of photovoltaic group string (as: different manufacturer of different rated power, package count that often group string is different, assembly etc.), different sizes or different technologies or hide shadow, can be connected on a common inverter, each group string is all operated in their respective maximum power peak simultaneously.Meanwhile, the loss that the length of direct current cables reduces, affected by the screening shadow between group string and causes due to the difference between group string reduces to minimum.
Group string inverter can have multichannel to input, and can follow the tracks of the maximum power point on every road respectively.Through experiment test, small-power group string inverter of the present utility model, every megawatts of power tracking module can reach 120 tunnels, 50 times are added than existing large-scale inverter increasing apparatus, improve power tracking effect, the utility model adds the energy output of about 3% than the large-scale inverter of existing 500kW.
Meanwhile, the following range of the electricity generation module that single inverter unit is corresponding-such as photovoltaic module reduces, and decreases group string mismatch ratio, thus decreases the loss of assembly energy output.
In addition, because in small-sized inverter of the present utility model, circulation is little, can two winding transformer be directly adopted to boost, with the easy generation circulation adopted in existing large-scale inverter increasing apparatus, and the transformer with split winding easily increasing loss is compared, investment on the transformer greatly reduces, and improves the economy of increasing apparatus.
More than describe each preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, all technical staff in the art according to design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should by the determined protection range of claims.

Claims (3)

1. a MW class group string data inversion boosting device, it is characterized in that, it comprises: some parallel with one another and group string inverter of converting direct-current power into alternating-current power for being produced by photovoltaic module, some interchange header boxs for the alternating current of conversion is confluxed, one for being become the alternating current of group string inverter generation into the two winding transformer of high pressure by low pressure, the DC side of each described group of string inverter connects described photovoltaic module, every 6 or 7 described group of string inverter are as row, group string formation one group of inverter array, the interchange outlet side of each described inverter array accesses respectively described in one and exchanges header box, those exchange header box rear access one low-pressure side bus parallel with one another, the low-pressure side of described two winding transformer is accessed by a master switch, wherein, the power organizing string inverter described in every platform is 28kVA, the quantity of described group of string inverter is 38.
2. MW class group string data inversion boosting device as claimed in claim 1, it is characterized in that, the high-pressure side of described two winding transformer is connected to the grid.
3. MW class group string data inversion boosting device as claimed in claim 1 or 2, it is characterized in that, the DC side of each described group of string inverter all accesses described header box by an alternating-current switch.
CN201520027746.1U 2015-01-15 2015-01-15 MW class group string data inversion boosting device Active CN204334372U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108462085A (en) * 2018-04-17 2018-08-28 江苏力阳电器制造有限公司 The photovoltaic box-type substation of intelligent interconnection can be achieved

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108462085A (en) * 2018-04-17 2018-08-28 江苏力阳电器制造有限公司 The photovoltaic box-type substation of intelligent interconnection can be achieved

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