Photovoltaic confluence device

Abstract

The utility model discloses a photovoltaic combiner device which comprises a box body, a first vertical partition plate and a second vertical partition plate are vertically arranged in the box body, and the box body is divided into a photovoltaic direct current combiner box, an inverter box and a photovoltaic alternating current combiner box by the first vertical partition plate and the second vertical partition plate; a first window is formed in the front of the photovoltaic direct current combiner box, a second window is formed in the front of the inverter box, and a third window is formed in the front of the photovoltaic alternating current combiner box; at least one transverse partition plate is transversely arranged in the inverter box; the transverse partition plate divides the inverter box into at least two inverter accommodating spaces; the bottom of the photovoltaic DC combiner box is provided with a wire inlet hole, and the bottom of the photovoltaic AC combiner box is provided with a wire outlet hole. The first window is provided with a first box cover; the second window is provided with a second box cover; the third window is provided with a third box cover. The photovoltaic direct-current combiner box, the inverter box and the photovoltaic alternating-current combiner box are designed into a whole, so that the cost of the box body is reduced; and the inverters are mutually isolated, so that the safety of the inverters is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power generation equipment, and specifically relates to a photovoltaic converging device. Background Art

[0002] Existing photovoltaic power generation equipment mainly includes solar cell arrays, photovoltaic DC combiner boxes, inverter boxes, and photovoltaic AC combiner boxes; the photovoltaic DC combiner box collects the multiple DC currents emitted by the solar cell array to the input end of the inverter. In order to reduce the impact on the power grid and avoid damage to the inverter due to excessive voltage, it is usually designed in a multi-way parallel manner. According to the DC voltage range of the inverter input, a certain number of photovoltaic modules of the same specifications are connected in series to form a battery string, and then several battery strings are connected to the lightning protection circuit, and the output is output after the lightning arrester and the circuit breaker, which is convenient for the access of the subsequent inverter. The maximum input voltage of the battery string can reach DC1000V.

[0003] The main function of the photovoltaic AC combiner box is to combine the output current of multiple inverters and protect the inverter from harm from the AC grid-connected side or load. It serves as the disconnect point of the inverter output, which helps to improve the safety of the system and protect the safety of installation and maintenance personnel.

[0004] In addition, the PV AC combiner box is usually installed near the inverter to facilitate the control of the inverter's AC switch and subsequent operation and maintenance. Its inlet and outlet lines use circuit breakers, and the system rated voltage can reach up to AC690V.

[0005] The protection level of photovoltaic DC combiner boxes, inverter boxes, and photovoltaic AC combiner boxes is usually IP65, which meets the requirements of outdoor installation such as waterproof, dustproof, UV-proof, and salt spray corrosion-proof.

[0006] The defects of the prior art are that the photovoltaic DC combiner box, the inverter box, and the photovoltaic AC combiner box are all separately and independently arranged, and the box manufacturing cost is relatively high; in addition, the inverter box is equipped with multiple inverters. When a fire occurs in one of the inverters due to a circuit fault, it may affect other inverters and cause damage to other inverters. Since the cost of inverters is relatively high, it will cause great economic losses. Utility Model Content

[0007] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a photovoltaic junction device, in which the photovoltaic DC junction box, the inverter box, and the photovoltaic AC junction box are designed as one body to reduce the box cost; the inverters are isolated from each other to improve the safety of the inverter.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: a photovoltaic junction device is provided, including a box body in the shape of a rectangular parallelepiped, in which a first vertical partition and a second vertical partition are vertically arranged in sequence, the first vertical partition and the second vertical partition are arranged parallel to each other and spaced apart, and the first vertical partition and the second vertical partition divide the box body from left to right into a photovoltaic DC junction box, an inverter box and a photovoltaic AC junction box; a first window is provided on the front of the photovoltaic DC junction box, a second window is provided on the front of the inverter box, and a third window is provided on the front of the photovoltaic AC junction box; at least one transverse partition is horizontally arranged in the inverter box; the transverse partition divides the inverter box into at least two inverter accommodating spaces, the first vertical partition is provided with a first cable through hole; the second vertical partition is provided with a second cable through hole; at least two inlet holes are provided at the bottom of the photovoltaic DC junction box, and at least two outlet holes are provided at the bottom of the photovoltaic AC junction box; the first window is provided with a first box cover; the second window is provided with a second box cover; the third window is provided with a third box cover.

[0009] A photovoltaic DC junction box is provided with a photovoltaic DC junction circuit; an inverter is provided in each inverter accommodating space of the inverter box, and a photovoltaic AC junction box is provided with a photovoltaic AC junction circuit; the incoming cable of the photovoltaic DC junction circuit is introduced through the incoming cable hole, the outgoing cable of the photovoltaic DC junction circuit is connected to the inverter accommodating space through the first cable via hole to connect to the corresponding inverter, the outgoing cable of the inverter is connected to the photovoltaic AC junction box through the second cable via hole to connect to the photovoltaic AC junction circuit, and the outgoing cable of the photovoltaic AC junction circuit is led out through the outgoing cable hole.

[0010] The wire inlet and the wire outlet are fixedly provided with protective sleeves.

[0011] The incoming cable of the photovoltaic DC bus circuit and the outgoing cable of the photovoltaic AC bus circuit are introduced or led out through the through holes of the protective casing.

[0012] Sealing rings are arranged between the first box cover, the second box cover and the third box cover and the box body.

[0013] The photovoltaic DC bus circuit is connected to at least two battery strings, each battery string is provided with a corresponding relay, the positive and negative poles of each battery string are connected to the input ends of the two normally open switches of the circuit breaker via the two normally closed switches of the relay, and the output ends of the two normally open switches of the circuit breaker are connected to the inverter; the positive and negative poles of each battery string are connected to the voltage sampling circuit, the voltage sampling circuit is connected to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the single-chip microcomputer, and the single-chip microcomputer is connected to the wireless communication module; the single-chip microcomputer is provided with a control output end, and the control output end controls the power on and off of the coil of the corresponding relay via the corresponding switch transistor; the input ends of the two normally open switches of the circuit breaker are connected to the lightning arrester.

[0014] Beneficial effects: The utility model provides a photovoltaic junction device, in which a photovoltaic DC junction box, an inverter box, and a photovoltaic AC junction box are designed as one, thereby reducing the cost of the box; the inverters are isolated from each other, thereby improving the safety of the inverters. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the schematic diagram of the original photovoltaic DC bus circuit;

[0016] Figure 2 This is the schematic diagram of the photovoltaic AC bus circuit;

[0017] Figure 3 It is a structural diagram of the utility model;

[0018] Figure 4 for Figure 3 A top view of

[0019] Figure 5 for Figure 4 A cross-sectional view of

[0020] Figure 6 for Figure 5 AA section view;

[0021] Figure 7 for Figure 6 BB cross-sectional view;

[0022] Figure 8 is a structural diagram of the first vertical partition;

[0023] Fig. 9 This is the structural diagram of the diaphragm;

[0024] Fig.10 This is a schematic diagram of the photovoltaic DC bus circuit of the utility model;

[0025] Fig.11 is a circuit diagram of an analog-to-digital conversion circuit;

[0026] Fig.12 This is the circuit schematic diagram of the microcontroller. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] When implementing: Figures 1 to 12As shown, a photovoltaic converging device comprises a box body 1 in a rectangular parallelepiped shape, wherein a first vertical partition 11 and a second vertical partition 12 are vertically arranged in sequence in the box body 1, the first vertical partition 11 and the second vertical partition 12 are arranged parallel to each other and spaced apart, and the first vertical partition 11 and the second vertical partition 12 divide the box body 1 from left to right into a photovoltaic DC converging box 1a, an inverter box 1b and a photovoltaic AC converging box 1c; a first window 2 is provided in front of the photovoltaic DC converging box 1a, a second window 3 is provided in front of the inverter box 1b, and a second window 4 is provided in front of the photovoltaic AC converging box 1c. The third window 4; at least one transverse partition 5 is horizontally arranged in the inverter box 1b; the transverse partition 5 divides the inverter box 1b into at least two inverter accommodating spaces 6, the first vertical partition 11 is provided with a first cable through-hole 7; the second vertical partition 12 is provided with a second cable through-hole 8; at least two incoming wire holes 9 are provided at the bottom of the photovoltaic DC combiner box 1a, and at least two outgoing wire holes 10 are provided at the bottom of the photovoltaic AC combiner box 1c; the first window 2 is provided with a first box cover 21; the second window 3 is provided with a second box cover 31; the third window 4 is provided with a third box cover 41.

[0029] The first vertical partition board 11 and the second vertical partition board 12 are fixedly connected to the inner wall of the box body 1 .

[0030] like Figures 3 to 5 As shown, the box 1 is divided from left to right into a photovoltaic DC combiner box 1a, an inverter box 1b and a photovoltaic AC combiner box 1c by a first vertical partition 11 and a second vertical partition 12, making them an integrated structure, which is beneficial to reducing the cost and weight of the box.

[0031] like Figure 5 , Figure 7 As shown, the first window 2, the second window 3, and the third window 4 are all provided with flanges 16 protruding outward, and the flanges 16 can prevent rainwater from penetrating into the box body 1. The first box cover 21, the second box cover 31, and the third box cover 41 are all provided with hinges on the left side and door locks on the right side, so as to facilitate opening and closing of the photovoltaic DC combiner box 1a, the inverter box 1b, and the photovoltaic AC combiner box 1c.

[0032] An inverter is installed in each inverter accommodating space 6, and the inverters are separated by a transverse partition 5, which is made of fire-retardant material. When a fire occurs in one inverter due to a circuit failure, it is not easy to spread to the adjacent inverters, thereby improving the safety of the inverter. Both sides of the transverse partition 5 are fixedly connected to the first vertical partition 11 and the second vertical partition 12.

[0033] like Figure 5 , Figure 6As shown, a line inlet hole 9 is provided at the bottom of the photovoltaic DC combiner box 1a, and a line outlet hole 10 is provided at the bottom of the photovoltaic AC combiner box 1c; the incoming cable of the photovoltaic DC combiner circuit is introduced through the line inlet hole 9, and the outgoing cable of the photovoltaic AC combiner circuit is led out through the line outlet hole 10; rainwater is prevented from penetrating into the photovoltaic DC combiner box 1a and the photovoltaic AC combiner box 1c through the line inlet hole 9 and the line outlet hole 10.

[0034] like Figure 3 , Figure 4 As shown, box mounting plates 17 are fixedly provided at the four corners of the outer wall of the box 1 , and the box mounting plates 17 are provided with box mounting holes. The box mounting plates 17 are used to fix the box 1 .

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, a photovoltaic DC combiner box 1a is provided with a photovoltaic DC combiner circuit; each inverter accommodating space 6 of the inverter box 1b is provided with an inverter, and a photovoltaic AC combiner box 1c is provided with a photovoltaic AC combiner circuit; the incoming cable of the photovoltaic DC combiner circuit is introduced through the incoming cable hole 9, and the outgoing cable of the photovoltaic DC combiner circuit is connected to the inverter accommodating space 6 through the first cable through-hole 7 to connect to the corresponding inverter, and the outgoing cable of the inverter is connected to the photovoltaic AC combiner box 1c through the second cable through-hole 8 to connect to the photovoltaic AC combiner circuit, and the outgoing cable of the photovoltaic AC combiner circuit is led out through the outgoing cable hole 10.

[0036] like Figure 5-Figure 7 As shown, the rear walls of the photovoltaic DC combiner box 1a, the inverter box 1b and the photovoltaic AC combiner box 1c are all fixedly provided with mounting nuts 14, and the mounting nuts 14 are provided with mounting internal threads; the photovoltaic DC combiner box 1a, the inverter box 1b and the photovoltaic AC combiner box 1c are all provided with circuit mounting plates 15, and the circuit mounting plates 15 are provided with mounting through holes, and the mounting bolts pass through the mounting through holes and are screwed into the mounting internal threads, and the circuit mounting plates 15 are installed on the mounting nuts 14 through the mounting bolts. The circuit mounting plates 15 in the photovoltaic DC combiner box 1a are used to install the photovoltaic DC combiner circuit; the circuit mounting plates 15 in the inverter box 1b are used to install the inverter; the circuit mounting plates 15 in the photovoltaic AC combiner box 1c are used to install the photovoltaic AC combiner circuit; the circuit mounting plates 15 are also provided with threaded holes for installing various circuit parts.

[0037] like Figure 3 , Figure 6 , Figure 7As shown, the inlet hole 9 and the outlet hole 10 are fixedly penetrated with a protective sleeve 13. The incoming cable of the photovoltaic DC bus circuit and the outgoing cable of the photovoltaic AC bus circuit are introduced or led out through the through hole of the protective sleeve 13. The protective sleeve 13 is made of plastic, ceramic and other materials, and is used to protect the incoming cable of the photovoltaic DC bus circuit and the outgoing cable of the photovoltaic AC bus circuit, and can reduce the circulation between the box body 1 and the outside air, and play a waterproof and dustproof effect.

[0038] The box body 1, the first box cover 21, the second box cover 31 and the third box cover 41 are all made of opaque materials and are coated with anti-corrosion paint to achieve the effects of anti-ultraviolet and anti-salt spray corrosion.

[0039] A sealing ring is arranged between the first box cover 21, the second box cover 31 and the third box cover 41 and the box body 1. The sealing ring is not shown in the drawings, and the sealing ring can prevent rainwater from penetrating and can also play a dustproof effect.

[0040] A desiccant bag is also provided in the box 1 for absorbing moisture and salt mist.

[0041] like Fig.10 , Fig.11 , Fig.12 As shown, the photovoltaic DC bus circuit is provided with a relay, a circuit breaker and a lightning arrester. The photovoltaic DC bus circuit is connected to at least two battery strings. The number of relays is the same as the number of battery strings. Each battery string is provided with a corresponding relay. The positive and negative poles of each battery string are respectively connected to the input ends of the two normally open switches of the circuit breaker via the two normally closed switches of the relay, and the output ends of the two normally open switches of the circuit breaker are connected to the inverter; the positive and negative poles of each battery string are connected to a voltage sampling circuit, the voltage sampling circuit is connected to an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to a single-chip microcomputer, and the single-chip microcomputer is connected to a wireless communication module; the single-chip microcomputer is provided with a control output end, and the control output end controls the power on and off of the coil of the corresponding relay via the corresponding switch transistor; the input ends of the two normally open switches of the circuit breaker are connected to the lightning arrester.

[0042] like Fig.10 , Fig.11 , Fig.12As shown, KM1-1 is the coil of the relay, and KM1-2 and KM1-3 are two normally closed switches of the relay. The voltage sampling circuit includes a voltage-dividing resistor R1 and a variable resistor R2. One end of the voltage-dividing resistor R1 is connected to the positive pole of a battery string, and the other end of the voltage-dividing resistor R1 is connected to one end of the variable resistor R2. The other end of the variable resistor R2 is connected to the negative pole of the battery string. The two ends of the variable resistor R2 are connected to one of the input end groups of the analog-to-digital conversion circuit as the output end group of the voltage sampling circuit. The analog-to-digital conversion circuit is provided with an AD7794BRU analog-to-digital conversion chip. The input end group AI1+ and AI1- of the AD7794BRU analog-to-digital conversion chip are connected to the voltage sampling circuit; the output end of the AD7794BRU analog-to-digital conversion chip The SCK, MOSI, and MISO groups are connected to the single-chip microcomputer to input voltage sampling data; the single-chip microcomputer is provided with a control output terminal PB2, and the control output terminal PB2 controls the corresponding relay coil KM1-1 to turn on and off through the corresponding switch transistor Q1; when it is necessary to detect the voltage at both ends of the battery string, the single-chip microcomputer controls the relay coil KM1-1 to turn on, and the two normally closed switches KM1-2 and KM1-3 of the relay are disconnected, so that the battery string is removed from the line, and then the voltage of the battery string is detected by the voltage sampling circuit. After the detection is completed, the two normally closed switches KM1-2 and KM1-3 of the relay are closed by the single-chip microcomputer. The voltage of each battery array can be detected by the above circuit, and the quality of the battery array can be judged by detecting the voltage. When the voltage of a battery array is significantly lower than the voltage of the other battery arrays, it can be preliminarily judged that the battery array has a fault, and the detection is a regular detection. The wireless communication module is used to send data wirelessly, and the figure is omitted.

[0043] The photovoltaic DC combiner box 1a, the inverter box 1b and the photovoltaic AC combiner box 1c are also provided with identification marks, such as the words "Photovoltaic DC Combiner Box" and the like.

[0044] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. A photovoltaic concentrator device, characterized in that: The invention comprises a box body (1) in the shape of a rectangular parallelepiped, wherein a first vertical partition (11) and a second vertical partition (12) are vertically arranged in sequence in the box body (1), the first vertical partition (11) and the second vertical partition (12) are arranged parallel to each other and spaced apart, and the first vertical partition (11) and the second vertical partition (12) divide the box body (1) from left to right into a photovoltaic DC junction box (1a), an inverter box (1b) and a photovoltaic AC junction box (1c); a first window (2) is provided on the front of the photovoltaic DC junction box (1a), a second window (3) is provided on the front of the inverter box (1b), and a third window (4) is provided on the front of the photovoltaic AC junction box (1c); At least one transverse partition (5) is arranged transversely in the inverter box (1b); the transverse partition (5) divides the inverter box (1b) into at least two inverter accommodating spaces (6); the first vertical partition (11) is provided with a first cable through hole (7); the second vertical partition (12) is provided with a second cable through hole (8); the bottom of the photovoltaic DC junction box (1a) is provided with at least two inlet holes (9); the bottom of the photovoltaic AC junction box (1c) is provided with at least two outlet holes (10); the first window (2) is provided with a first box cover (21); the second window (3) is provided with a second box cover (31); and the third window (4) is provided with a third box cover (41).

2. A photovoltaic concentrator according to claim 1, characterized in that: A photovoltaic DC junction box (1a) is provided with a photovoltaic DC junction circuit; each inverter accommodating space (6) of the inverter box (1b) is provided with an inverter, and a photovoltaic AC junction box (1c) is provided with a photovoltaic AC junction circuit; an incoming cable of the photovoltaic DC junction circuit is introduced through an incoming cable hole (9), an outgoing cable of the photovoltaic DC junction circuit is connected to the inverter accommodating space (6) through a first cable through-hole (7) to connect to a corresponding inverter, an outgoing cable of the inverter is connected to the photovoltaic AC junction box (1c) through a second cable through-hole (8) to connect to the photovoltaic AC junction circuit, and an outgoing cable of the photovoltaic AC junction circuit is led out through an outgoing cable hole (10).

3. A photovoltaic concentrator according to claim 1, characterized in that: The wire inlet hole (9) and the wire outlet hole (10) are fixedly provided with a protective sleeve (13).

4. A photovoltaic concentrator according to claim 1, characterized in that: Sealing rings are provided between the first box cover (21), the second box cover (31) and the third box cover (41) and the box body (1).

5. A photovoltaic concentrator according to claim 2, characterized in that: The photovoltaic DC bus circuit is connected to at least two battery strings, each battery string is provided with a corresponding relay, the positive and negative poles of each battery string are connected to the input ends of the two normally open switches of the circuit breaker via the two normally closed switches of the relay, and the output ends of the two normally open switches of the circuit breaker are connected to the inverter; the positive and negative poles of each battery string are connected to the voltage sampling circuit, the voltage sampling circuit is connected to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the single-chip microcomputer, and the single-chip microcomputer is connected to the wireless communication module; the single-chip microcomputer is provided with a control output end, and the control output end controls the power on and off of the coil of the corresponding relay via the corresponding switch transistor; the input ends of the two normally open switches of the circuit breaker are connected to the lightning arrester.

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