CN104184408A - Photovoltaic junction box with photovoltaic module substring level optimizing function and photovoltaic module thereof - Google Patents

Abstract

The invention discloses a photovoltaic junction box with photovoltaic module sub-string optimization function and its photovoltaic module. The photovoltaic junction box includes a box body and a plurality of photovoltaic module sub-string power optimizers, and the box body is provided with two wiring outputs. terminals and multiple sets of binding post groups; wherein, each set of binding post groups has a one-to-one correspondence with the component substrings of the photovoltaic module, and has a positive terminal and a negative terminal, and the positive terminal is used to connect the positive pole of the component substring, The negative pole terminal is used to connect the negative pole of the module substring; the PV module substring power optimizer has an input wiring port group and an output wiring port group, the input wiring port group includes a positive input wiring port and a negative input wiring port, and the positive input wiring port It is connected with the corresponding positive terminal, and the negative input terminal is connected with the corresponding negative terminal. The invention can not only reduce the impact of the mismatch between the electrical properties of the components and the shadow shielding of the components on the power generation of the photovoltaic components, but also reduce the failure risk of the hot spots of the photovoltaic components.

Description

Photovoltaic junction box with photovoltaic module sub-string optimization function and its photovoltaic module

technical field

The invention relates to a photovoltaic junction box with a sub-string optimization function of a photovoltaic module and a photovoltaic module thereof.

Background technique

At present, the solar energy industry, as a low-carbon renewable energy source, is booming around the world, and the installation volume in various countries is increasing year by year. Photovoltaic modules are the most important core components in photovoltaic systems, which undertake the function of converting light energy into electrical energy. Conventional photovoltaic modules usually adopt a conventional junction box design, and a certain number of diodes are arranged in the junction box. The diodes only protect the module from hot spot failure, and usually do not have the function of performance optimization.

In system design, it is usually necessary to select photovoltaic modules with the same or completely close electrical performance parameters for series-parallel connection to form a system. If unmatched components are selected or shaded at the component installation place, it will not only affect the blocked components and reduce the power generation, but also affect other components in the same circuit, resulting in a significant drop in the output of the system array , seriously affecting the power generation of the system. At the same time, the general photovoltaic system is equipped with the MPPT maximum power tracking function. This function is usually realized by the inverter in the system to automatically track the maximum power point, so that the photovoltaic modules can work at the maximum power point and maximize the power generation. The more MPPTs in a system with the same capacity, the greater the gain in power generation.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a photovoltaic junction box with the sub-string optimization function of photovoltaic modules, which can not only reduce the mismatch between the electrical properties of the components and the shadow of the components, etc. In addition, it can reduce the risk of hot spot failure of photovoltaic modules, greatly improve the applicability and reliability of photovoltaic modules in complex occasions and different installation environments, and increase their power generation.

In order to solve the above technical problems, the technical solution of the present invention is: a photovoltaic junction box with photovoltaic module sub-string optimization function, including a box body, and a plurality of photovoltaic module sub-string power optimizers, the box body is provided with Two wiring outputs and multiple sets of terminal posts; where,

Each set of binding posts corresponds to the component substrings of photovoltaic modules one by one, and has a positive terminal and a negative terminal. The positive terminal is used to connect the positive pole of the component substring, and the negative terminal is used to connect the component substring. negative electrode;

The photovoltaic module substring level power optimizer also corresponds to the module substrings of the photovoltaic module one by one, and has an input wiring port group and an output wiring port group. The input wiring port group includes a positive input wiring port and a negative input wiring port. The input wiring port is connected to the corresponding positive terminal, the negative input terminal is connected to the corresponding negative terminal, the output terminal group includes the positive output terminal and the negative output terminal, photovoltaic module sub-string power optimizer The connectors between the output wiring port groups are connected in series in sequence, and the negative output wiring port of the first photovoltaic module sub-string power optimizer is electrically connected to one of the wiring output terminals, and the last photovoltaic module sub-string power The positive output wiring port of the optimizer is electrically connected with another wiring output terminal.

Further, in order to facilitate its connection and conduction without additional wiring connection, the box body is provided with multiple installation positions, and the photovoltaic module sub-string power optimizer is installed in the corresponding installation position, and the photovoltaic module sub-string power optimization The positive input wiring port, the negative input wiring port, the positive output wiring port and the negative output wiring port of the device are all provided with card notches, and the positive terminal, the negative terminal, the connecting body and the wiring output are on the box body Corresponding parts on the top are provided with card protrusions corresponding to the card notches, and the conduction connection between the two is realized through the cooperation of the card protrusions and the card notches.

Further, there are three groups of binding posts, and three sub-string power optimizers for photovoltaic modules.

The present invention also provides a photovoltaic module, which adopts the photovoltaic junction box with the sub-string optimization function of the photovoltaic module, and has a plurality of module substrings correspondingly connected with the terminal groups of the photovoltaic junction box one by one.

After adopting the above technical scheme, the photovoltaic module substring power optimizer in the photovoltaic junction box of the present invention has a photovoltaic module substring optimization function, and the so-called substring optimization function decomposes the component substrings in the photovoltaic module into reasonable Quantity. At present, the cells in each photovoltaic module are usually divided into 3 module substrings. The photovoltaic module substring level power optimizer can increase the number of MPPTs in the system, and the output current and output of each module substring in the photovoltaic module The voltage is adjusted and optimized to generate the best power, so that the components can achieve the best balance between power generation gain and cost, significantly improve the power generation of the components in the system, and can solve the problem of significantly reducing the mismatch between the electrical performance of the components and the components in the system The impact of shadow shading on the power generation of photovoltaic systems can also reduce the risk of hot spot failure of modules, and greatly improve the applicability and reliability of photovoltaic modules in complex occasions and different installation environments. At the same time, the cell string-level optimization function of the junction box and its components can effectively increase the power generation of the system.

Description of drawings

Fig. 1 is the internal schematic diagram of the photovoltaic junction box with photovoltaic module sub-string optimization function of the present invention;

Fig. 2 is a schematic structural diagram of the photovoltaic module of the present invention.

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, a photovoltaic junction box with a photovoltaic module sub-string optimization function includes a box body 1 and a plurality of photovoltaic module sub-string power optimizers 2, and the box body 1 is provided with two wiring outputs terminal 1-1 and multiple sets of terminal blocks; where,

Each group of binding posts corresponds to the component substrings of the photovoltaic module 3 one by one, and has a positive terminal 1-2 and a negative terminal 1-3, and the positive terminal 1-2 is used to connect the positive pole of the component substring, The negative terminals 1-3 are used to connect the negative poles of the component substrings;

Photovoltaic module substring level power optimizer 2, which also corresponds to the module substrings of photovoltaic module 3 one by one, and has an input wiring port group and an output wiring port group, and the input wiring port group includes positive input wiring port 2-1 and negative pole Input connection port 2-2, the positive input connection port 2-1 is connected to the corresponding positive terminal 1-2, the negative input connection port 2-2 is connected to the corresponding negative terminal 1-3, the output connection port The group includes the positive output wiring port 2-3 and the negative output wiring port 2-4. The photovoltaic module sub-string power optimizer 2 is serially connected in series through the connector 4 between the output wiring port groups, and the first photovoltaic module sub-string The negative output wiring port 2-4 of the power optimizer 2 is electrically connected to one of the wiring output terminals 1-1, and the positive output wiring port 2-3 of the last photovoltaic module sub-string power optimizer 2 is connected to the other wiring The output terminals 1-1 are electrically connected to each other.

As shown in Figure 1, there are multiple installation positions in the box body 1, and the photovoltaic module sub-string power optimizer 2 is installed in the corresponding installation position, and the positive input connection port 2 of the photovoltaic module sub-string power optimizer 2 -1, the negative input wiring port 2-2, the positive output wiring port 2-3 and the negative output wiring port 2-4 are all provided with a card notch 23, the positive terminal 1-2, the negative terminal 1-3, the connection The body 4 and the wiring output terminal 1-1 are all provided with a card protrusion corresponding to the card notch 23 on the corresponding parts of the box body 1, and the guide between the two is realized through the cooperation of the card protrusion and the card notch 23. connect.

There are three sets of terminal groups, and there are three PV module sub-string power optimizers 2, but not limited to this, according to the module specifications, you can choose different numbers of terminal groups and the corresponding PV module sub-string power optimizer 2 quantity.

As shown in FIG. 2 , a photovoltaic module adopts a photovoltaic junction box with a photovoltaic module substring optimization function, and has a plurality of module substrings connected to the terminal groups of the photovoltaic junction box in one-to-one correspondence.

As shown in Figure 1, the box body 1 is designed with wiring windows 1-4 for the input wiring of component substrings, and the input wiring of component substrings corresponds to the connecting posts below the input windows 1-4; the box body is designed with Fix the position of the photovoltaic module sub-string power optimizer 2, and each position is designed with a small protrusion - a card protrusion, which is convenient for the positioning, placement, and fixing of the photovoltaic module sub-string power optimizer 2; photovoltaic module sub-string power optimization After the device 2 is placed and fixed, the wiring port of the sub-string power optimizer 2 of the photovoltaic module will be connected to other corresponding ports, that is, the terminal group is connected to the input wiring port group corresponding to the sub-string power optimizer 2 of the photovoltaic module. The connection is conducted, and the connection conduction between the photovoltaic module sub-string power optimizer 2 and the photovoltaic module sub-string power optimizer 2 has also been conducted through the connecting body 4 .

The photovoltaic module sub-string power optimizer 2 placed and fixed in the box body 1 of the junction box shown in Figure 1, its size matches the installation position and space size in the box body 1, the photovoltaic module sub-string power optimizer There are four card slots 23 on the 2 for easy positioning and installation. The main working principle of the photovoltaic module sub-string power optimizer 2 is that it is designed with corresponding positive input wiring ports 2-1 and negative input wiring ports 2 -2. The positive output wiring port 2-3 and the negative output wiring port 2-4 are installed on the box body, between the wiring port and the module substring, the photovoltaic module substring power optimizer 2 and the photovoltaic module substring Conductive connections are realized between the power optimizers 2 and between the photovoltaic module sub-string power optimizers 2 and the wiring output terminals 1-1.

The box body 1 should also have a junction box cover to achieve conventional sealing and protection functions, and it is enough to meet the use functions. There are no special requirements. The internal inventive structure is not shown in the figure, and the box cover is not drawn.

As shown in Figure 2, with the photovoltaic module installed in this junction box, the substring of the module is output in a circuit stacked way with six electrode outputs, and the six electrodes are connected to the corresponding positions of the junction box through the input window of the junction box. A specific circuit connection is formed between the corresponding component substrings of the components and the photovoltaic component substring level power optimizer 2, so as to realize the function of optimizing the performance of the battery strings.

The PV module sub-string power optimizer 2 can use the VT8020/VT8024 photovoltaic module sub-string optimizer smart chip produced by Maxim Semiconductor.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects to be solved by the present invention in further detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit In the present invention, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A photovoltaic junction box with a photovoltaic module sub-string optimization function, comprising a box body (1), characterized in that: it also includes a plurality of photovoltaic module sub-string power optimizers (2), on the box body (1) There are two wiring output terminals (1-1) and multiple sets of binding post groups; among them, Each group of binding posts corresponds to the component substrings of photovoltaic modules (3) one by one, and has a positive terminal (1-2) and a negative terminal (1-3), and the positive terminal (1-2) is used For connecting the positive pole of the component substring, the negative terminal (1-3) is used to connect the negative pole of the component substring; The photovoltaic module substring power optimizer (2), which also corresponds to the module substrings of the photovoltaic module (3), has an input connection port group and an output connection port group, and the input connection port group includes a positive input connection port ( 2-1) and the negative input wiring port (2-2), the positive input wiring port (2-1) is connected to the corresponding positive terminal (1-2), the negative input wiring port (2-2) is connected to the phase The corresponding negative terminals (1-3) are connected, the output terminal group includes the positive output terminal (2-3) and the negative output terminal (2-4), and the photovoltaic module sub-string power optimizer (2) passes The connectors (4) between the output wiring port groups are connected in series in sequence, and the negative output wiring port (2-4) of the first photovoltaic module sub-string power optimizer (2) is connected to one of the wiring output terminals (1-1 ) are electrically connected, and the positive output connection port (2-3) of the last sub-string power optimizer (2) of the photovoltaic module is electrically connected with another connection output terminal (1-1). 2. The photovoltaic junction box with photovoltaic module sub-string optimization function according to claim 1, characterized in that: the box body (1) is provided with a plurality of installation positions, and the photovoltaic module sub-string power optimizer (2) Installed in the corresponding installation position, the positive input wiring port (2-1), the negative input wiring port (2-2), and the positive output wiring port (2) of the photovoltaic module sub-string power optimizer (2) -3) and the negative output wiring port (2-4) are provided with a card notch (23), the positive terminal (1-2), the negative terminal (1-3), the connector (4) The corresponding parts of the box body (1) and the wiring output terminal (1-1) are provided with card protrusions corresponding to the card notch (23), and the mutual Conductive connection between the two. 3. The photovoltaic junction box with the sub-string optimization function of photovoltaic modules according to claim 1, characterized in that: there are three groups of terminal posts, and the sub-string power optimizer (2) of photovoltaic modules There are three settings. 4. A photovoltaic module, characterized in that: it adopts a photovoltaic junction box with a photovoltaic module sub-string optimization function according to any one of claims 1 to 3, and has a plurality of terminals connected to the photovoltaic junction box Group-to-one correspondence of connected component substrings.