CN214069884U

CN214069884U - Cascade photovoltaic power generation efficiency management intelligent optimizer

Info

Publication number: CN214069884U
Application number: CN202120055772.0U
Authority: CN
Inventors: 段正刚
Original assignee: Suzhou QC Solar Co Ltd
Current assignee: Suzhou QC Solar Co Ltd
Priority date: 2020-11-30
Filing date: 2021-01-11
Publication date: 2021-08-27
Anticipated expiration: 2031-01-11

Abstract

The utility model provides a sub-cascade photovoltaic power generation efficiency management intelligent optimizer, which comprises a box body, a control circuit board, a box cover and a cable conductor, wherein the control circuit board is arranged in the box body and is provided with an MPPT control module, a DC/DC converter, an intelligent bypass diode, a sub-cascade bus bar connection area and a cable connection area; and the intelligent optimizer is connected with each battery pack sub-string in the photovoltaic module. The utility model can realize the optimization of the string-level power generation efficiency, independently carry out MPPT, eliminate the problem of performance mismatch between the minimum plates and improve the power generation capacity of the photovoltaic system; the intelligent bypass diode is adopted to replace the traditional bypass diode, so that smaller temperature rise and lower power consumption are achieved, and the reliability of the photovoltaic system is improved; the U type structure and the middle breach design of electric conductor both conveniently observe the riveting condition of cable conductor, conveniently carry out extra soldering tin again, make the riveting department atress even, increase cable conductor connection firmness.

Description

Cascade photovoltaic power generation efficiency management intelligent optimizer

Technical Field

The utility model relates to a photovoltaic power generation technical field especially relates to a sub-cascade photovoltaic power generation efficiency management intelligent optimization ware.

Background

At present, a photovoltaic module formed by combining a plurality of solar cells is widely used for building various photovoltaic power generation systems or building curtain walls to build energy-saving and environment-friendly buildings. The photovoltaic power generation system is an assembly array formed by connecting a plurality of battery assemblies in series and parallel, and each battery assembly comprises a plurality of battery pieces connected in series. In a photovoltaic system, the parameters of each solar cell module are not completely the same, and the solar radiation conditions may be different, for example, different degrees of soiling on the surface of the module, local shadows due to various reasons, module orientation, etc., which may cause the actual power generation of each solar cell module in the photovoltaic system to be different, i.e., the actual output power of each parallel string of solar cell modules is different from the theoretical maximum output power. The actual power generation capacity of the photovoltaic system has a direct relationship with the system efficiency, theoretically, the power generation efficiency of the photovoltaic system is generally about 80%, and according to actual statistical data, even in western regions with good illumination radiation conditions, the average system efficiency of the photovoltaic system is only 74%.

To solve this problem, the most widely used at present is to use a Maximum Power Point Tracking (MPPT) circuit in the photovoltaic Power generation system. The general MPPT control circuit and the inverter are integrally installed in an inverter case, the output power of the whole photovoltaic system is adjusted through the MPPT control circuit, or the output power of each battery pack string is adjusted by connecting one MPPT control circuit for each battery pack string in the system; in the former method, as long as there is a difference between the outputs of the component strings, the strings will affect each other, the output voltage will be limited to a lower value (barrel effect), resulting in energy loss, and the larger the difference of the strings is, the greater the energy loss is; in addition, the serious difference between the strings can cause local hot spots and influence the overall reliability of the system; in the latter method, the MPPT control circuit can only adjust the maximum output power for each module string, and cannot actually optimize the output power of each module or even a single battery string in each module.

In addition, when some cells of the photovoltaic system are shaded, the shaded cells may appear as hot spots due to excessive power consumption of the reverse bias cells, and a conventional P-N junction diode or schottky diode is currently used as a bypass element to alleviate the problem. Unfortunately, the forward voltage of such diodes is still high (about 0.6V for a normal diode and 0.4V for a schottky diode), power consumption is high, and internal temperature of the junction box where the diodes are located is increased, and module reliability is reduced.

Most high-power components in the market at home and abroad are single-body and three-split junction boxes mainly based on the conventional bypass performance. With the rapid updating and upgrading of the photovoltaic module technology, novel components such as a high-power double-glass component, a high-power single-side component and a laminated tile component become mainstream products in the market. Against this background, higher demands are made on the development and innovation of the terminal.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and the intelligent optimizer of sub-cascade photovoltaic power generation efficiency management who proposes replaces veneer MPPT terminal box, realizes sub-cascade optimization, eliminates minimum plate performance mismatch problem, promotes photovoltaic module's generating capacity greatly.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sub-cascade photovoltaic power generation efficiency management intelligent optimizer comprises a box body, a control circuit board, an electric conductor and a box cover, wherein the control circuit board is arranged in the box body, and an MPPT control module, a DC/DC converter, an intelligent bypass diode, a sub-cascade bus bar connection area and a cable connection area are arranged on the control circuit board; the photovoltaic power generation efficiency management intelligent optimizer is connected with each battery pack substring in the photovoltaic module; the MPPT control module controls the DC/DC converter to enable the battery pack substrings in the photovoltaic module to provide maximum power generation power; the intelligent bypass diode comprises a built-in FET tube, an FET driver module and a charge pump for driving an FET to provide a resistance path for bypass current to pass; the substring-level bus bar connecting area is connected with the substring bus bar of the photovoltaic assembly; one end of the conductor is connected with the control circuit board, and the other end of the conductor is fixedly connected with the cable.

Preferably, the substring-level bus bar connection region is connected with the photovoltaic module substring bus bar in a welding mode.

Preferably, the electrical conductor is part of a cable connection area.

Preferably, the conductor and the control circuit board are of an integral structure or are electrically connected with the control circuit board.

Preferably, the conductor is disposed at one or both ends of the control circuit board.

Preferably, one end of the conductor connected with the cable is of a U-shaped structure, and the middle parts of two sides of the conductor are provided with notches.

Preferably, the both ends of box body are equipped with cable conductor installation department and buckle, buckle detachably install in the below of cable conductor installation department, the structure of buckle with the structure phase-match of cable conductor installation department, cable conductor installation department with the inside formation of buckle supplies the passageway that the cable conductor passed.

Preferably, the box body is provided with a first mounting structure for positioning and mounting the box body and the box cover, and the box cover is provided with a second mounting structure matched with the first mounting structure.

Preferably, the first mounting structure is a clamping block, the second mounting structure is a clamping groove, and the structure of the clamping block is matched with that of the clamping groove.

Preferably, the MPPT control module drives the DC/DC converter, the intelligent bypass diode is connected between the negative electrode of the single-string battery piece and the positive electrode of the DC/DC output, and the current collection part of the DC/DC converter is provided with an LC filter circuit.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the MPPT control module is integrated on the control circuit board, so that the optimization of the power generation efficiency of the substrings can be realized, the MPPT control of the substrings at one level can be independently performed, the problem of performance mismatch between minimum plates is eliminated, and the power generation capacity of the photovoltaic system is improved;

2. the intelligent bypass diode is adopted to replace the traditional bypass diode, so that smaller temperature rise and lower power consumption are achieved, and the reliability of the photovoltaic system is improved;

3. the U type structure and the middle breach design of electric conductor both conveniently observe the riveting condition of cable conductor, conveniently carry out extra soldering tin again, make the riveting department atress even, increase cable conductor connection firmness.

Drawings

Fig. 1 is an exploded view of a sub-cascade photovoltaic power generation efficiency management intelligent optimizer according to embodiment 1 of the present invention;

fig. 2 is a top view of the intelligent optimizer for sub-cascade photovoltaic power generation efficiency management according to embodiment 1 of the present invention (with the box cover removed);

fig. 3 is a cross-sectional view of a sub-cascade photovoltaic power generation efficiency management intelligent optimizer of embodiment 1 of the present invention;

fig. 4 is a schematic perspective view of an electrical conductor connected to a cable in an intelligent optimizer for sub-cascade photovoltaic power generation efficiency management according to embodiment 1 of the present invention;

fig. 5 is a schematic diagram of the intelligent optimizer for sub-cascade photovoltaic power generation efficiency management applied to a photovoltaic module;

FIG. 6 is a connection diagram of an electrical system of a sub-cascade photovoltaic power generation efficiency management intelligent optimizer applied to a photovoltaic module battery sub-string;

FIG. 7 is an enlarged view of the structure at A in FIG. 6;

fig. 8 is a block diagram of a circuit structure of an intelligent bypass diode of the intelligent optimizer for managing sub-string photovoltaic power generation efficiency according to the present invention.

In the figure, 100-intelligent optimizer, 10-box body, 11-cable installation part, 12-buckle, 13-first installation structure, 20-control circuit board, 21-MPPT control module, 22-intelligent bypass diode, 23-substring bus bar connection area, 24-cable connection area, 30-box cover, 31-second installation structure, 40-cable, 50-conductor, 51-gap, 60-photovoltaic component substring bus bar, 70-photovoltaic component and 71-connection cable.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Please refer to fig. 1 to fig. 3 in combination, which are schematic views of an explosion structure of a sub-string-level photovoltaic power generation efficiency management intelligent optimizer in embodiment 1 of the present invention, the sub-string-level photovoltaic power generation efficiency management intelligent optimizer 100 includes a box body 10, a control circuit board 20, a box cover 30 and a cable 40, the control circuit board 20 is disposed in the box body 10, and the control circuit board 20 is provided with an MPPT control module 21, an intelligent bypass diode 22, a sub-string-level bus bar connection area 23 and a cable connection area 24; the MPPT control module 21 is used for ensuring that the photovoltaic module substrings provide maximum power so as to eliminate the problem of performance mismatch between minimum plates; the intelligent bypass diode 22 is used for reducing temperature rise and loss and improving reliability; the sub-string level bus bar connecting area 23 is used for connecting the sub-string bus bars of the photovoltaic module; the cable connection area 24 is used to connect the control circuit board 20 with the cable line 40.

Referring to fig. 5, when the utility model discloses a substring-level photovoltaic power generation efficiency management intelligent optimization ware 100 is applied to in photovoltaic module 70, substring-level busbar joining region 23 and photovoltaic module substring busbar welded connection, every group battery substring in photovoltaic power generation efficiency management intelligent optimization ware 100 and the photovoltaic module 70 is connected to general 72For example, the photovoltaic module 70 is formed by 24 pieces of battery pieces, each two rows of 24 pieces of battery pieces are connected in series to form a sub-string, each sub-string is connected with a photovoltaic power generation efficiency management intelligent optimizer 100, and thus, each sub-string includes an MPPT control module 21 and an intelligent bypass diode 22. Further, referring to fig. 8, the smart bypass diode 22 incorporates a FET (Field Effect Transistor) Q1, a FET driver module, and a charge pump that drives the FET to provide a resistive path for bypass current to pass through; when the battery piece is damaged or shielded, the FET tube is conducted, and bypass current passes through the FET tube; voltage drop V generated by current_FThrough the anode and cathode of the diode, during which time the charge pump circuit activates charging capacitor C1 to a high voltage driving the FET on. Compared with the commonly used P-N junction diode and Schottky diode, the intelligent diode has lower forward voltage drop, and has the advantages of low temperature rise, low power consumption and good reliability. The utility model discloses can carry out MPPT control to every battery sub-string in the photovoltaic module, realize the generating efficiency and optimize, improve photovoltaic system's generated energy.

Please refer to fig. 1 and fig. 3 in combination, the utility model discloses a sub-cascade photovoltaic power generation efficiency management intelligent optimizer 100 still includes the electric conductor 50 fixed at the end of the control circuit board 20 and fixed with cable connection, it should be understood that, for split type photovoltaic power generation efficiency management intelligent optimizer, when needing to use three in an assembly, need to connect the cable between the adjacent intelligent optimizer, for the part standardization during production, be convenient for part management and reduce production cost, the utility model discloses a photovoltaic power generation efficiency management intelligent optimizer can adopt standardized design, is provided with the electric conductor 50 at both ends of the control circuit board 20 of each intelligent optimizer 100, of course, the user can carry out different designs according to the mounted position of the intelligent optimizer 100; the conductor 50 is made of copper, one end of the conductor 50 is connected to the cable connection area 24 of the control circuit board 20, and the other end of the conductor 50 is riveted to the cable 40. In one embodiment, the end of the conductor 50 connected to the cable 40 is U-shaped, and the middle of the two sides thereof is provided with a notch 51. When being connected with cable conductor 40, in the U type structure of conductor 50 was arranged in to cable conductor 40 head, conductor 50 riveted with cable conductor 40, and the design of breach 51 had both conveniently observed the riveting condition of cable conductor 40, conveniently carries out extra soldering tin in the riveting department again, makes the riveting department atress even, increases riveting firmness, prolongs the life of intelligent optimization ware 100.

Referring to fig. 1, a cable mounting portion 11 and a buckle 12 are disposed at two ends of the box 10, the buckle 12 is detachably mounted below the cable mounting portion 11, a structure of the buckle 12 matches a structure of the cable mounting portion 11, and a channel for a cable 40 to pass through is formed inside the cable mounting portion 11 and the buckle 12. In the installation process, the cable 40 passes through the channel formed by the cable installation part 11 and the buckle 12, and the buckle 12 is correspondingly buckled with the cable installation part 11 to fix the cable 40.

In another embodiment, the electrical conductor may be part of the cable connection region 24, and the electrical cable is directly welded to the cable connection region 24 by resistance welding.

Referring to fig. 1, a first mounting structure 13 for positioning and mounting the box body 10 and the box cover 30 is disposed on the box body 10, and a second mounting structure 31 matched with the first mounting structure 13 is disposed on the box cover 30. The number and positions of the first mounting structures 13 and the second mounting structures 31 can be designed according to actual requirements. In one embodiment, the first mounting structure 13 is a latch, and the second mounting structure 31 is a slot, and the structure of the latch matches with the structure of the slot. In the actual manufacturing process, box body 10 adopts the totally enclosed encapsulating mode to seal, and on box cover 30 clamped box body 10, waterproof dustproof ability is strong, can ensure that intelligent optimization ware 100 has longer life.

Please refer to fig. 5 to 7 in combination, fig. 5 is a schematic diagram of the intelligent optimizer for sub-cascade photovoltaic power generation efficiency management applied to a photovoltaic module according to the present invention; FIG. 6 is a connection diagram of an electrical system of a sub-cascade photovoltaic power generation efficiency management intelligent optimizer applied to a photovoltaic module sub-string; fig. 7 is an enlarged view of the structure at a in fig. 6. When the intelligent optimizer 100 for managing the sub-string photovoltaic power generation efficiency is applied to a photovoltaic module, the sub-string bus bars 60 of the photovoltaic module are directly welded with the sub-string bus bar connecting area 23 in each intelligent optimizer 100, each sub-string is provided with the MPPT control module 21, the MPPT control of the sub-string can be independently carried out, the sub-string optimization is realized, and the problem of performance mismatch between the minimum plates is eliminated; by adopting the intelligent bypass diode 22, the system can be ensured to have smaller temperature rise and power consumption and higher reliability. As shown in fig. 7, the MPPT control module drives the DC/DC converter, the intelligent bypass diode is connected between the negative electrode of the single-string battery and the positive electrode of the DC/DC output, and the current collection part of the DC/DC converter is provided with an LC filter circuit to eliminate interference signals and ensure the control accuracy of the system.

To sum up, the utility model provides a sub-cascade photovoltaic power generation efficiency management intelligent optimizer, the MPPT control module is integrated on the control circuit board, the optimization of sub-cascade power generation efficiency can be realized, the MPPT control is independently carried out, the problem of performance mismatch between minimum plates is eliminated, and the power generation capacity of a photovoltaic system is improved; the intelligent bypass diode is adopted to replace the traditional bypass diode, so that smaller temperature rise and lower power consumption are achieved, and the reliability of the photovoltaic system is improved; the U type structure and the middle breach design of electric conductor both conveniently observe the riveting condition of cable conductor, conveniently carry out extra soldering tin again, make the riveting department atress even, increase cable conductor connection firmness.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. The utility model provides a sub-cascade photovoltaic power generation efficiency management intelligent optimization ware which characterized in that: the intelligent optimizer comprises a box body, a control circuit board, an electric conductor and a box cover, wherein the control circuit board is arranged in the box body, and an MPPT control module, a DC/DC converter, an intelligent bypass diode, a substring-level bus bar connection area and a cable connection area are arranged on the control circuit board; the photovoltaic power generation efficiency management intelligent optimizer is connected with each battery pack substring in the photovoltaic module; the MPPT control module controls the DC/DC converter to enable the battery pack substrings in the photovoltaic module to provide maximum power generation power; the intelligent bypass diode comprises a built-in FET tube, an FET driver module and a charge pump for driving an FET to provide a resistance path for bypass current to pass; the substring-level bus bar connecting area is connected with the substring bus bar of the photovoltaic assembly; one end of the conductor is connected with the control circuit board, and the other end of the conductor is fixedly connected with the cable.

2. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 1, wherein: and the substring-level bus bar connecting area is connected with the substring bus bar of the photovoltaic assembly in a welding manner.

3. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 1, wherein: the electrical conductor is part of a cable connection area.

4. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 1, wherein: the conductor and the control circuit board are of an integral structure or are electrically connected with the control circuit board.

5. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 4, wherein: the conductor is arranged at one end or two ends of the control circuit board.

6. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 4, wherein: the conductor and the one end that the cable conductor is connected are U type structure, and its both sides middle part is equipped with the breach.

7. The substring-level photovoltaic power generation efficiency management intelligent optimizer of any one of claims 1-6, wherein: the both ends of box body are equipped with cable conductor installation department and buckle, buckle detachably install in the below of cable conductor installation department, the structure of buckle with the structure phase-match of cable conductor installation department, cable conductor installation department with the inside formation of buckle supplies the passageway that the cable conductor passed.

8. The substring-level photovoltaic power generation efficiency management intelligent optimizer of any one of claims 1-6, wherein: the box body is provided with a first mounting structure used for positioning and mounting the box body and the box cover, and the box cover is provided with a second mounting structure matched with the first mounting structure.

9. The substring-level photovoltaic power generation efficiency management intelligent optimizer of claim 8, wherein: the first mounting structure is a clamping block, the second mounting structure is a clamping groove, and the structure of the clamping block is matched with that of the clamping groove.

10. The substring-level photovoltaic power generation efficiency management intelligent optimizer of any one of claims 1-6, wherein: the MPPT control module controls the DC/DC converter, the intelligent bypass diode is connected between the negative electrode of the single-string battery piece and the positive electrode of the DC/DC output, and the current collection part of the DC/DC converter is provided with an LC filter circuit.