CN212435640U

CN212435640U - Photovoltaic array and photovoltaic power generation system

Info

Publication number: CN212435640U
Application number: CN202020921090.9U
Authority: CN
Inventors: 李久广; 周强
Original assignee: Gcl Energy Engineering Co ltd
Current assignee: Gcl Green Energy System Technology Co ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-01-29
Anticipated expiration: 2030-05-27

Abstract

The utility model relates to a photovoltaic square matrix and photovoltaic power generation system. The photovoltaic square matrix comprises a box-type transformer, a plurality of photovoltaic group strings, a plurality of inverters, a plurality of photovoltaic cables and a plurality of inverter cables; the photovoltaic array is provided with a central area and a plurality of string areas, the plurality of string areas take the central area as the center, the box-type transformer is positioned in the central area, the plurality of photovoltaic string areas are distributed in the string areas, the same inverter is connected with the photovoltaic string areas through photovoltaic cables, and the inverters in the string areas are connected to the box-type transformer through inverter cables; the string region has a connection end portion, which is the end portion closest to the box-type transformer among the end portions of the string region, to which the inverters in the string regions are connected. This application can effectively reduce photovoltaic square matrix cost.

Description

Photovoltaic array and photovoltaic power generation system

Technical Field

The utility model relates to a solar energy technical field especially relates to photovoltaic square matrix and photovoltaic power generation system.

Background

A photovoltaic square matrix is a direct current power generation unit composed of several photovoltaic modules or photovoltaic panels assembled together mechanically and electrically in a certain manner and having a fixed support structure.

With more and more flat-price internet-surfing projects, the trend of the photovoltaic square matrix is increased in size, and the cost is controlled urgently. And the photovoltaic square matrix cost of the traditional photovoltaic power generation system is higher.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a photovoltaic square matrix and a photovoltaic power generation system aiming at the problem that the cost of the photovoltaic square matrix of the conventional photovoltaic power generation system is high.

A photovoltaic array is disclosed, which comprises a photovoltaic array,

the photovoltaic square matrix comprises a box-type transformer, a plurality of photovoltaic group strings, a plurality of inverters, a plurality of photovoltaic cables and a plurality of inverter cables;

the photovoltaic square matrix is provided with a central area and a plurality of group string areas, the group string areas take the central area as the center, the box-type transformer is positioned in the central area, the photovoltaic group strings are distributed in the group string areas, in each group string area, the same inverter is connected with a plurality of photovoltaic group strings through the photovoltaic cables, and the inverters in the group string areas are connected to the box-type transformer through the inversion cables;

the string region has a connection end portion that is the end portion closest to the box transformer among the end portions of the string region to which the inverter in each string region is connected.

In one embodiment, in each string region, the photovoltaic strings are arranged in multiple rows and multiple columns, and the same inverter connects two adjacent rows of the photovoltaic strings.

In one embodiment, the photovoltaic string strings in the same column in two adjacent rows of the photovoltaic string strings are connected to the same maximum power tracker of the inverter.

In one embodiment, the inverters connected with two adjacent rows of the photovoltaic string are arranged at the connecting end part of one row of the photovoltaic string close to the box-type transformer.

In one embodiment, the number of the photovoltaic string strings in each row is 6-9.

In one embodiment, a plurality of inverters are arranged in the same group string region, and the plurality of inverters are distributed in a row at the connection end of the group string region.

In one embodiment, the inverter cables connected to the plurality of inverters provided in the same string region share a cable trench.

In one embodiment, the photovoltaic array further includes a plurality of supports, the number of which is the same as that of the photovoltaic strings, and the plurality of photovoltaic strings are respectively fixed in each support.

In one embodiment, the photovoltaic cables connecting the photovoltaic strings are bundled and fixed along the support.

A photovoltaic power generation system comprises at least one photovoltaic square matrix.

The photovoltaic array string region has a connection end portion, the connection end portion is an end portion of each end portion of the string region, the end portion is closest to the box-type transformer, and the inverters in the string regions are connected to the connection end portion. Therefore, the total usage amount of the inversion cables between the inverters in each group of string areas and the box-type transformer can be effectively reduced. And the inverter cable between the inverter and the box transformer is generally higher in unit price. Therefore, the embodiment adopts the arrangement mode, the cost of the photovoltaic square matrix is effectively reduced, and the cost of the photovoltaic power generation system is effectively reduced.

Drawings

Fig. 1 is a schematic diagram of a photovoltaic array in one embodiment.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "upper", "lower", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In one embodiment, a photovoltaic power generation system is provided that includes at least one photovoltaic square. Referring to fig. 1, the photovoltaic square matrix has a central area CA and a plurality of group string areas SA. Each set of string areas SA is centered on the center area CA.

Meanwhile, the photovoltaic square matrix includes a box-type transformer 100, a plurality of photovoltaic string 200, a plurality of inverters 300, a plurality of photovoltaic cables, and a plurality of inverter cables 400. Direct current generated by a photovoltaic string 200 of the photovoltaic power generation system is converted into alternating current through an inverter 300, enters a box-type transformer 100, and then is connected to a substation through the box-type transformer 100. The photovoltaic cable connects the photovoltaic string 200 and the inverter 300. The inverter cable 400 connects the inverter 300 and the box transformer 100.

Specifically, it may be provided that the photovoltaic array further includes a plurality of supports having the same number as the number of the photovoltaic string 200. The bracket is used for fixing the photovoltaic string 200. A plurality of photovoltaic strings 200 are respectively fixed in each rack. In this case, each of the volt group strings 200 can be fixed easily and efficiently.

In addition, at this time, the photovoltaic cables connected to the photovoltaic string 200 may be bundled and fixed along the bracket, and then the photovoltaic cables may be safely led out to the inverter 300.

The bracket is fixed by a convenient and safe technical means compared with the conventional bracket, but the embodiment is not limited by the technical means.

A plurality of photovoltaic strings 200 are distributed within each string region. Also, within each string region, several photovoltaic strings 200 are connected to the same inverter 300, and the generated direct current is converted into alternating current by the same inverter 300. Then, the inverters 300 in each group of string regions are connected to the box transformer 100 through the inverter cables 400.

The box transformer 100 is located in the central area CA. Each set of string areas SA is centered on the center area CA. Therefore, it is advantageous to reduce the total amount of the inverter cables 400 from the inverter 300 to the box transformer 100 in each set of the string regions SA. Meanwhile, the lengths of the inverter cables 400 from the inverters 300 to the box-type transformer 100 in each group of the string regions SA are not different from each other. Therefore, the voltage difference between each inverter 300 and the box transformer 100 is small, thereby reducing the mismatch loss caused by the voltage difference between each inverter 300 and the box transformer 100.

It is understood that the box-type transformer 100 is located in the central area CA, which means that it may be desirable that the box-type transformer 100 is located at the center of the photovoltaic array, or that the box-type transformer 100 is located at a distance from the center of the photovoltaic array due to some terrain or the like.

Also, each set of string regions has a plurality of ends. For example, each set of string regions SA in fig. 1 has an upper end, a lower end, a left end, and a right end. In the present embodiment, the end closest to the box transformer 100 among the ends of the string area SA is used as the connection end. For example, the right end of the group string area SA at the upper left corner in fig. 1 is the connection end. The inverters 300 in each set of string regions SA are connected to the connection end.

Therefore, the present embodiment can effectively reduce the total amount of the inverter cables 400 from the inverter 300 to the box transformer 100 in each group of the string regions SA. The inversion cable 400 from the inverter 300 to the box transformer 100 is generally more expensive (e.g., using three cores 3 x 95 mm)²Cable(s) of (a). Therefore, the present embodiment adopts such an arrangement,the cost of the photovoltaic square matrix is effectively reduced, and the cost of the photovoltaic power generation system is effectively reduced.

In one embodiment, the same inverter 300 connects two adjacent rows of pv strings 200.

Within each string area SA of the photovoltaic array, the photovoltaic strings 200 are generally arranged in a multi-row and multi-column array. At this time, the same inverter 300 is arranged to connect two adjacent rows of photovoltaic string 200, and only the photovoltaic cable connected to one row of photovoltaic string 200 can be connected to the inverter 300 after the connecting end of the row is buried in a pipe. And the photovoltaic cables connected to the other row of photovoltaic strings 200 are directly connected to the inverter 300. Thereby reducing the workload of buried pipe penetration. The number of photovoltaic strings 200 may be 6-9 per row of photovoltaic strings 200. Of course, the present application is not limited thereto, and the same inverter 300 may be provided to connect two or more rows of photovoltaic strings 200. In each row of pv strings 200, the number of pv strings 200 may also be other values, which is not limited in this application.

Specifically, an inverter 300 having an 18-way interface may be employed. At this time, the number of the pv strings 200 in each row may be 9, and the 18 interfaces of the inverter 300 are connected to the two rows of pv strings 200, so that the interfaces of the inverter 300 are fully connected. Of course, the inverter 300 interface may be underfilled. The number of pv strings 200 in each row of pv strings 200 may also be other values. The number of interface circuits of the inverter 300 may be other, which is not limited in the present application.

Further, the inverters 300 connecting two adjacent rows of pv strings 200 may be disposed at the end of one row of pv strings 200 near the box-type transformer 100. For example, in the group string region SA at the upper right corner in fig. 1, the inverters 300 connected to two adjacent rows of the pv group strings 200 are disposed at the connection end portions of the lower row of the pv group strings 200. At this time, the amount of the inverter cable 400 can be further reduced.

In one embodiment, the same column of photovoltaic string in two adjacent rows of photovoltaic strings is connected to the same maximum power tracker (MPPT) of inverter 300.

After photovoltaic string 200 generates electricity, the electricity flows into inverter 300. Inverter 300 has a plurality of MPPTs to track the power of each photovoltaic string 200. The pv string 200 is connected to the inverter 300 by a pv cable. The longer the photovoltaic cable between the photovoltaic string 200 and the inverter 300, the greater the voltage drop from the photovoltaic string 200 to the inverter 300.

After two pv strings 200 are connected to the same MPPT, the MPPT performs maximum power tracking based on the pv string 200 having a larger voltage drop with the inverter 300. If the voltage drop difference between two strings 200 connected to the same MPPT and the inverter 300 is too large, a part of the electric energy of the string 200 with a smaller voltage drop with the inverter 300 is lost because of non-generation.

In this embodiment, the pv strings 200 in the same column in two adjacent rows of pv strings 200 are connected to the same MPPT of the inverter 300. The photovoltaic cables between the photovoltaic strings 200 in the same column in the two adjacent rows of photovoltaic strings 200 and the inverter 300 have little difference in length, so that the loss of electric energy caused by the overlarge voltage drop difference between the two photovoltaic strings 200 connected to the same MPPT and the inverter 300 can be prevented.

In one embodiment, a plurality of inverters 300 are disposed in the same group of string regions SA, and the plurality of inverters 300 are distributed in a row at the connection end of the group of string regions SA, so that the inverters 300 are uniformly distributed, and the performance of the photovoltaic matrix is more uniform.

In addition, when each inverter 300 is connected to the box-type transformer 100, a cable trench needs to be dug to place the inverter cable 400 therebetween.

In the present embodiment, since the plurality of inverters 300 in the same string area SA are arranged in a row at the connection end of the string area SA, the inverter cables 400 connected to the plurality of inverters 300 in the string area SA may be further provided to share a cable trench. At this time, the excavation amount of the cable trench can be effectively reduced.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A photovoltaic array is characterized in that,

2. The photovoltaic array of claim 1, wherein in each string region, the strings are arranged in a plurality of rows and columns, and the same inverter connects two adjacent rows of strings.

3. The photovoltaic square matrix of claim 2, wherein a same one of two adjacent rows of the photovoltaic string is connected to a same maximum power tracker of the inverter.

4. The photovoltaic array according to claim 2, wherein the inverters of two adjacent rows of the photovoltaic strings are disposed near a connection end of one row of the photovoltaic strings of the box-type transformer.

5. The photovoltaic square matrix of claim 2, wherein the number of photovoltaic strings in each row of the photovoltaic strings is 6-9.

6. The photovoltaic array of claim 1, wherein a plurality of inverters are disposed in the same string region, and the plurality of inverters are arranged in a row at a connection end of the string region.

7. The photovoltaic square matrix of claim 6, wherein the inverter cables connected to a plurality of inverters provided within the same string region share a cable trench.

8. The photovoltaic array of claim 1, further comprising a plurality of supports equal in number to the photovoltaic strings, the plurality of photovoltaic strings being secured within each of the supports.

9. The photovoltaic array of claim 8, wherein the photovoltaic cables connecting the strings are bundled and secured along the support.

10. A photovoltaic power generation system comprising at least one photovoltaic square as claimed in any one of claims 1 to 9.